WO2007081003A1 - 人工皮革用基材およびその製造方法 - Google Patents
人工皮革用基材およびその製造方法 Download PDFInfo
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- WO2007081003A1 WO2007081003A1 PCT/JP2007/050413 JP2007050413W WO2007081003A1 WO 2007081003 A1 WO2007081003 A1 WO 2007081003A1 JP 2007050413 W JP2007050413 W JP 2007050413W WO 2007081003 A1 WO2007081003 A1 WO 2007081003A1
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- WIPO (PCT)
- Prior art keywords
- fiber
- nonwoven fabric
- polymer sheet
- ultrafine
- artificial leather
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/06—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/10—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one other macromolecular compound obtained by reactions only involving carbon-to-carbon unsaturated bonds as constituent
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/10—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically
- D04H3/105—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically by needling
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
- D06N3/0004—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using ultra-fine two-component fibres, e.g. island/sea, or ultra-fine one component fibres (< 1 denier)
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
- D06N3/0013—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using multilayer webs
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
- Y10T442/647—Including a foamed layer or component
Definitions
- the present invention relates to a base material for artificial leather, in which a polymer elastic body is contained in a non-woven fabric composed of ultrafine fiber bundles.
- a base material for artificial leather in which a polymer elastic body is contained in a non-woven fabric composed of ultrafine fiber bundles.
- artificial leather that can be used for the production of silver-like artificial leather that has a soft texture with a soft feeling and resilience of a natural sheep leather that has been crushed and has a folded fold that has a bulging feel. It relates to the substrate.
- a conventional method for producing a general base material for artificial leather is as follows. In other words, two types of polymer-powered ultrafine fiber-generating fibers with different solubility properties are stapled, web-cured using a card, cross wrapper, random weber, etc., and entangled into a nonwoven fabric by needle punching etc.
- a manufacturing method using long fibers instead of short fibers does not require a series of large-scale equipment such as a raw cotton feeding device, a fiber opening device, a card machine, and a crosslay machine, as compared with the manufacturing method using short fibers.
- ! / ⁇ has advantages.
- Long fiber nonwoven fabrics also have higher strength and lower IJ points than short fiber nonwoven fabrics.
- PVA Polybulal alcohol
- PVA Polybulal alcohol
- a soft and full-fledged (waist) artificial leather a high density nonwoven fabric contains a small amount of rosin.
- Artificial leather obtained by soaking has been proposed (see, for example, Patent Document 2).
- the proposed artificial leather lacks the softness of the surface and is insufficient as a shoe material to be worn under severe conditions where the interlaminar strength is weak.
- a long-fiber nonwoven fabric has been proposed that combines the softness and waist of natural leather with the aim of obtaining artificial leather with silver that is free from bending wrinkles (see Patent Document 3).
- Patent Document 3 long fibers are actively cut at the time of entanglement with a needle punch, and the cut ends of the fibers are present on the surface of the non-woven fabric at a density of 5 to: LOO pieces Zmm 2 to entangle the long fiber non-woven fabric. Distortion that occurs characteristically in processing is eliminated.
- any vertical cross section (thickness direction cross section) of the non-woven fabric that is, fibers oriented in the thickness direction by needle punches in any vertical cross section of the non-woven fabric per lcm width.
- the total area occupied by the fiber bundle is 5 to 70% of the cross-sectional area in any horizontal cross section of the nonwoven fabric.
- the proposed nonwoven fabric structure cuts long fibers within a range that does not degrade the physical properties as much as possible, it actually cuts a considerable number of long fibers. This significantly reduces the contribution to the strength of the nonwoven fabric, and the effect of long fibers cannot be obtained sufficiently.
- a leather-like sheet obtained by impregnating and solidifying a polymer elastic body in an entangled body obtained by laminating and intertwining two or more kinds of webs and sheets made of different fiber ridges the surface of the base layer is formed.
- the fineness of the ultrafine fibers is 0.01-0.5 decitex, and the fineness of the ultrafine fibers that make up the back surface is 1Z2 or less.
- a leather-like sheet has been proposed (for example, see Patent Document 4). 0
- the proposed leather-like sheet lacks the softness of the surface, and obtains a silvered tone leather with a fine crease. It was difficult.
- Patent Document 1 Japanese Patent Publication No. 63-5518 (pages 2 to 4)
- Patent Document 2 JP-A-4 185777 (2-3 pages)
- Patent Document 3 JP 2000-273769 A (pages 3 to 5)
- Patent Document 4 Japanese Patent Laid-Open No. 2003-13369 (pages 2-6)
- the object of the present invention is that various combinations of ultrafine fibers and polymer elastic bodies are possible, and there is no natural sheep leather-like rebound! /
- An object of the present invention is to provide a base material for artificial leather and a method for manufacturing the same, which can manufacture a silver-finished artificial leather having a fine folded wrinkle.
- the present invention includes a laminate in which a nonwoven fabric layer A that has a bundle strength of ultrafine fibers having an average single fineness of 0.5 dtex or less and a cushion layer B that is made of an elastic polymer sheet are combined. A part of the ultrafine fibers constituting the nonwoven fabric layer A penetrates the cushion layer B, and the ultrafine fiber layer C is formed on the outer surface of the cushion layer B. The inner surface of the elastic polymer sheet is in the thickness direction.
- High and low differential force S A corrugated shape of 100 m or more, and a gap with a height of 100 / zm or more is formed between the corrugated surface of the elastic polymer sheet and the nonwoven fabric layer A.
- the present invention relates to an artificial leather base material.
- the present invention includes the following steps (1) to (5): (1) ⁇ (2) ⁇ (3) ⁇ (4) ⁇ (5), or
- the present invention relates to a method for producing the artificial leather substrate.
- Step (1) Ultrafine fiber capable of generating a bundle of ultrafine fibers having an average single fineness of 0.5 decitex or less.
- Step (2) The fiber web obtained in step (1) and the elastic polymer sheet are laminated, and a part of the ultrafine fiber generating fibers constituting the fiber web penetrates the elastic polymer sheet, A step of needle punching to obtain a composite nonwoven fabric so as to form a layer of ultrafine fiber generating fiber force penetrating the outer surface of the elastic polymer sheet, and at least a part of the needle punching A brush belt is placed in contact with the outer surface of the polymer sheet, and the outer surface side force of the fiber web is punched by one dollar, thereby generating an extra fine fiber that penetrates the coasting polymer sheet and protrudes from the outer surface. A step of keeping the mold fiber held by the brush belt
- Step (3) The composite nonwoven fabric obtained in step (2) is subjected to heat shrinkage treatment in the elastic polymer sheet. Process to make the surface wavy
- Step (4) A step of impregnating the solid nonwoven fabric obtained by the step (3) with a polymer elastic body solution dissolved or dispersed in a non-solvent for the elastic polymer sheet and solidifying the step (5): A process of transforming ultrafine fiber generating fibers into ultrafine fiber bundles.
- FIG. 1 is an electron micrograph (100 ⁇ ) showing an arbitrary TD-direction vertical cross section of a silver-tone artificial leather obtained in Example 1.
- FIG. 2 is a schematic side view showing an example of a velor-one dollar device used in the present invention.
- the ultrafine fibers constituting the nonwoven fabric layer A and the ultrafine fiber layer C of the present invention are multicomponent fibers (composite fibers) having at least two or more types of spinable polymer having different chemical or physical properties. It is a fiber that has been made ultrafine by extracting and removing at least one kind of polymer at an appropriate stage before or after impregnation with the polymer elastic body.
- the multicomponent fiber that generates this ultrafine fiber is an ultrafine fiber generation type fiber. Typical examples include sea-island-type cross-section fibers, multilayer-laminated cross-section fibers, and radiation-type laminate-type cross-section fibers obtained using methods such as chip blend (mixed spinning) and composite spinning.
- the ultrafine fiber-generating fiber is preferable from the viewpoint of less fiber damage at the time of a one-punch punch and the uniformity of the fineness of the ultrafine fiber.
- the polymer constituting the island component of the sea-island type cross-sectional fiber is not particularly limited, but is polyethylene terephthalate (hereinafter referred to as PET), polytrimethylene terephthalate (hereinafter referred to as PTT), polybutylene terephthalate. (Hereinafter referred to as PBT), polyester elastomers and other polyesters; nylon 6, nylon 66, nylon 610, nylon 12, aromatic polyamides, polyamide elastomers and other polyamides; polyurethanes; polyolefins and other fibers Polymers having forming ability are preferred.
- polyester resin such as PET, PTT, and PBT is particularly preferable in terms of the texture and practical performance of a silver-tone artificial leather that can be obtained by heat shrinking.
- the melting point of the polymer is 160 ° C or higher, and a fiber-forming crystalline resin having a melting point of 180 to 250 ° C is more preferable. In the present invention, the melting point was measured by the method described later. Extra fine fiber
- colorants such as dyes and pigments, UV absorbers, heat stabilizers, deodorizers, fungicides, stabilizers, and the like may be added to the fats and oils that make up.
- the polymer constituting the sea component of the sea-island type cross-section fiber is not particularly limited, but the island component and the solubility in the solvent or the decomposability to the decomposing agent are different, so that the affinity for the island component and the spin conditions are different. It is preferable that the melt viscosity is lower than the island component or the surface tension is low.
- at least one selected polymer strength such as polyethylene, polypropylene, polystyrene, ethylene propylene copolymer, ethylene acetate butyl copolymer, styrene ethylene copolymer, styrene acrylic copolymer, polybulal alcohol resin, etc. These polymers are mentioned.
- thermoplastic polyvinyl alcohol-based resin PVA-based resin
- Selection is made with comprehensive consideration of punch characteristics, environmental pollution, and ease of dissolution and removal.
- a nonwoven fabric made of PVA-based composite fiber using such a PVA-based resin as a sea component and further using the above-described heat-shrinkable resin as an island component has a bulky property of the PVA-based composite fiber. Rough hardening of the nonwoven fabric due to fiber damage hardly occurs during needle punching. In addition, if the PVA-based resin is plasticized to some extent by adding a small amount of moisture to the nonwoven fabric, and heat treatment is performed in this state to shrink the composite fiber, the density of the nonwoven fabric can be easily and stably increased.
- the PVA resin After applying the water-based emulsion of the polymer elastic body to the nonwoven fabric having such characteristics at a low temperature at which the PVA resin does not dissolve in water, the PVA resin is dissolved and removed by water at a temperature at which the PVA resin dissolves in water. As a result, voids are generated between the ultrafine fibers and the polymer elastic body, and the densification and flexibility of the artificial leather base material can be achieved at the same time.
- the artificial leather using the base material thus obtained is very similar to natural leather in terms of drape and texture.
- the mass ratio of the sea component polymer in the ultrafine fiber generating fiber is preferably 5 to 70 mass%, more preferably 10 to 60 mass%, and even more preferably 15 to 50 mass%.
- the content is 5% by mass or more, the spinning stability of the composite fiber is good, the amount of components to be removed is sufficient, and a sufficient number of voids are formed between the ultrafine fiber and the polymer elastic body. Therefore, an artificial leather having excellent flexibility can be obtained. If the amount is 70% by mass or less, an appropriate amount of components to be removed is obtained, and the shape of the resulting artificial leather is stabilized. Therefore, it is necessary to use a large amount of polymer elastic body. There is no need.
- the amount of water applied to plasticize the PVA-based resin is reduced when shrinking, and the amount of heat required for drying is reduced. Can improve productivity. Further, it is possible to avoid inconveniences such as insufficient shrinkage due to a small amount of shrinking components and markedly different shrinkage states depending on the location, thereby improving production stability.
- the viscosity average degree of polymerization (hereinafter simply referred to as the degree of polymerization) is 200 to 500 force, more preferably 230 to 470 force, and more preferably 250 to 450 force S.
- the degree of polymerization is 200 or more, the melt viscosity is moderate and the composite with the island component polymer is easy.
- the degree of polymerization is 500 or less, it is possible to avoid the problem that the melt viscosity is too high and it becomes difficult to discharge the spinning nozzle resin.
- a so-called low polymerization degree PVA having a polymerization degree of 500 or less there is also an advantage that the dissolution rate becomes faster when dissolving with hot water.
- the degree of polymerization (P) of PVA is measured in accordance with JIS-K6726. In other words, after re-saponifying and purifying PVA, it can be calculated from the intrinsic viscosity [7?] Measured in water at 30 ° C by the following equation.
- the saponification degree of PVA is from 90 to 99.99 mole 0/0 Power Preferably, from 93 to 99.98 mole 0/0 laid more preferred, from 94 to 99.97 Monore 0/0 force more preferably, 96 to 99.96 Monore 0/0 force ⁇ particularly preferred! /,.
- the saponification degree is 90 mol% or more, satisfactory melt spinning can be performed without thermal decomposition or gelation with good thermal stability, and biodegradability is also good.
- the copolymerization monomer described later facilitates ultra-thinning without lowering water solubility. Kenya degree is larger than 99.99 mol%, PVA is difficult to produce stably.
- the PVA used in the present invention has biodegradability, and is decomposed into water and carbon dioxide when activated sludge treatment or buried in soil.
- the activated sludge method is preferred for the treatment of waste liquid containing PVA after dissolving and removing PVA!
- the PVA aqueous solution is continuously treated with activated sludge, it decomposes within 2 days to 1 month.
- the PVA used in the present invention has a low combustion heat and a small load on the incinerator, the PVA-containing waste liquid power should be incinerated after removing water.
- the melting point (Tm) of PVA is preferably 160 to 230 ° C force S, more preferably 170 to 227 ° C force S, and more preferably 175 to 224 ° C, particularly preferably 180 to 220 ° C.
- Tm melting point
- the melting point is 160 ° C. or higher, it is possible to avoid the problem that the thermal stability is deteriorated and the fiber formation is difficult because the crystallinity is lowered and the fiber strength is lowered.
- melt spinning can be performed at a temperature lower than the decomposition temperature of PVA, and PVA fibers can be produced stably. The melting point was determined by the method described later.
- PVA can be obtained by saponifying a resin mainly composed of vinyl ester units.
- the bull compound monomer for forming a bull ester unit include formate bull, acetate bull, propionate bull, valerate bull, strength purate bull, laurate bull, stearate bull, benzoate bull, and bivalate bull.
- vinyl acetate is preferable from the viewpoint of easily obtaining PVA.
- the PVA may be a homo PVA or a modified PVA introduced with copolymerized units.
- the modified PVA introduced with copolymerized units may be used. It is preferable to use it.
- a-olefins having 4 or less carbon atoms such as ethylene, propylene, 1-butene, and isobutene, methyl vinyl ether, and ethyl vinyl ether are used.
- N-propyl butyl ether, isopropyl butyl ether, n -butyl butyl ether and the like butyl ethers are preferred.
- the amount of units derived from a- olefins having 4 or less carbon atoms and Z or vinyl ethers is preferably 1 to 20 mol% of the modified PVA structural unit, more preferably 4 to 15 mol%, and 6 to 13 mol. % Is more preferable.
- ethylene units is preferably 4 to 15 mole 0/0
- yo Ri preferably preferably is 6-13 mole 0/0 containing modified PVA ! /
- PVA is produced by a known method such as a bulk polymerization method, a solution polymerization method, a suspension polymerization method, or an emulsion polymerization method.
- a known method such as a bulk polymerization method, a solution polymerization method, a suspension polymerization method, or an emulsion polymerization method.
- the bulk polymerization method and the solution polymerization method in which polymerization is performed without solvent or in a solvent such as alcohol are preferable.
- the solvent for solvent polymerization include lower alcohols such as methyl alcohol, ethyl alcohol, and propyl alcohol.
- Initiators used for copolymerization include a, a'-azobisisobuty-tolyl, 2, 2'-azobis ( 2,4 dimethyl-valero-tolyl), benzoyl peroxide, n-propyl peroxide carbonate and other known initiators such as azo initiators or peroxide initiators.
- the polymerization temperature is not particularly limited, but a range of 0 ° C to 150 ° C is appropriate.
- the artificial leather substrate of the present invention comprises the following steps (1) ⁇ (2) ⁇ (3) ⁇ (4) ⁇ (5), or
- Step (1) Ultrafine fiber capable of generating a bundle of ultrafine fibers having an average single fineness of 0.5 decitex or less.
- Step (2) The fiber web obtained in step (1) and the elastic polymer sheet are laminated, and a part of the ultrafine fiber generating fibers constituting the fiber web penetrates the elastic polymer sheet, A step of needle punching to obtain a composite nonwoven fabric so as to form a layer of ultrafine fiber generating fiber force penetrating the outer surface of the elastic polymer sheet, and at least a part of the needle punching A brush belt is placed in contact with the outer surface of the polymer sheet, and the outer surface side force of the fiber web is punched by one dollar, thereby generating an extra fine fiber that penetrates the coasting polymer sheet and protrudes from the outer surface. A step of keeping the mold fiber held by the brush belt
- Step (3) Step of heat-shrinking the composite nonwoven fabric obtained in step (2) to make the inner surface of the elastic polymer sheet corrugated
- Step (4) A step of impregnating the solid nonwoven fabric obtained by the step (3) with a polymer elastic body solution dissolved or dispersed in a non-solvent for the elastic polymer sheet and solidifying the step (5): A process of transforming ultrafine fiber generating fibers into ultrafine fiber bundles.
- a fiber web is manufactured from ultrafine fiber generating fibers.
- the ultrafine fiber-generating fiber obtained by spinning and drawing to the desired fineness is given a desired fiber length after crimping. It may be cut and stapled, and formed into a fiber web using a card, a cross wrapper, a random weber, or the like. Alternatively, the fiber web may be simultaneously spun with the spunbond method. For example, after the ultrafine fiber generating fiber discharged from the spinning nozzle hole is cooled by a cooling device, the desired fineness and the desired fineness can be obtained using a suction device such as an air jet nozzle.
- the fiber web may be formed by pulling and pulverizing with a high-speed airflow at a speed corresponding to a take-up speed of 1000 to 6000 mZ and depositing on a collection surface such as a mobile net while opening the fiber. If necessary, the obtained fiber web may be partially crimped by a press or the like to stabilize the shape.
- a fiber web manufacturing method does not require a series of large equipment such as a raw cotton supply device, a fiber opening device, and a card machine, which is essential in the conventional fiber web manufacturing method via short fibers. is there.
- a long fiber web or a base material for artificial leather manufactured using the same also has long continuous fiber strength, a conventional short fiber web or a base for artificial leather manufactured using the same is used.
- the “long fiber” is a fiber having a longer fiber length than a short fiber having a fiber length of usually about 10 to 50 mm, and is not intentionally cut like a short fiber.
- the fiber length of the long fibers before ultra-thinning is preferably 100 mm or more and can be manufactured technically, and fiber lengths of several meters, hundreds of meters, and several kilometers are also possible unless physically cut. included.
- the fineness is required to be 2 dtex or more, and 3 to 6 dtex was generally adopted in consideration of manufacturing stability.
- the fineness of the ultrafine fiber-generating fiber itself is considered in consideration of the spinning stability of the ultrafine fiber-generating fiber itself, which basically does not have any constraints on the upper and lower limits of the fineness of the ultrafine fiber-generating fiber. Should be approximately 0.5 dtex or more.
- the fineness of the ultrafine fiber generating fiber is preferably 1 to 5 dtex from the viewpoints of physical properties and texture of the obtained artificial leather substrate.
- the basis weight of the fiber web is preferably in the range of 80 to 2000 g / m 2 and more preferably in the range of 100 to 1500 g / m 2 from the viewpoint of process handling and quality stability.
- the fineness, cross-sectional shape, extracted component ratio, etc. of the ultrafine fiber-generating fiber are preferably set so that the average single fineness after ultrafine fiber formation is in the range of 0.0003 to 0.5 detex.
- the ultrafine fibers themselves have an appropriate rigidity, so that the nonwoven fabric structure is crushed and densified, resulting in a heavy and hard base material for artificial leather. Avoid getting tired Can When it is 0.5 decitex or less, a soft artificial leather base material without rebound is obtained, and a silver-finished artificial leather with excellent surface smoothness and a dense crease is obtained.
- the average single fineness of the ultrafine fibers is more preferably in the range of 0.005-0.35 dtex, and still more preferably in the range of 0.01-0.2 dtex.
- the fiber web to be the nonwoven fabric layer A produced in the step (1) and the elastic polymer sheet to be the cushion layer B are integrated.
- the elastic polymer used in the elastic polymer sheet examples include polyurethane-based resins, poly-salt-vinyl-based resins, polyvinyl-butyral-based resins, and polyacrylic-based resins that are conventionally used in the production of artificial leather. And polyamino acid-based resins, silicon-based resins, and mixtures thereof. Of course, these resins may be copolymers, but since an artificial leather substrate having a good balance of texture and physical properties can be obtained, an elastic polymer mainly composed of polyurethane resin is most preferable.
- the elastic polymer sheet preferably has a high continuity in the plane direction, and the shape may be a film or a non-woven fabric.
- the elastic polymer sheet is preferably a non-woven fabric.
- Such an elastic polymer nonwoven fabric can be obtained by, for example, a melt blown method described later.
- the polyurethane preferably used in the present invention has, for example, a polymer diol, preferably an average molecular weight of 600 to 3000 obtained by reacting at least one diol with at least one dicarboxylic acid or ester thereof. It can be obtained by reacting a polyester diol with an organic disoocyanate in the presence of a chain extender.
- the diol include ethylene glycol, propanediol, 1,4 butanediol, 1,5 pentanediol, 3-methyl-1,5 pentanediol, neopentyl glycol, 1,6 hexanediol and the like having 2 to 2 carbon atoms.
- dicarboxylic acid examples include aliphatic dicarboxylic acids such as succinic acid, dartaric acid, and adipic acid.
- Aromatic diisocyanates such as phenol-diisocyanate, tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, hexamethylene diisocyanate, lysine diisocyanate, cyclohexane diisocyanate, isophorone diisocyanate
- aliphatic diisocyanates and alicyclic diisocyanates such as hydrogenate, dicyclohexylmethane diisocyanate, and hydrogenated tetramethylxylylene diisocyanate.
- chain extender examples include low molecular compounds having two active hydrogen atoms, such as diol, amino alcohol, hydrazine, and diamine.
- a polymer diol, an organic diisocyanate, and a chain extender are mixed in a desired ratio, and a thermoplastic polyurethane is obtained by a polymerization reaction such as melt polymerization, bulk polymerization, or solution polymerization.
- a polymerization reaction such as melt polymerization, bulk polymerization, or solution polymerization.
- polyether-based polyurethane, polycarbonate-based polyurethane, copolymers and mixtures thereof are used depending on the purpose.
- the ratio of the raw materials so that the content power of the polymer diol to be a soft segment in the thermoplastic polyurethane is 5 to 75% by mass.
- it polymerizes in the presence of a chain extender mainly composed of a low molecular weight aliphatic diol or isophorone diamine, and the polyurethane has an intrinsic viscosity [7?] Of 0.5 to 1.5 dlZg. It is preferable to adjust the degree of polymerization so as to be in the range.
- the melted polyurethane When the content of the soft segment is 45% by mass or more, the melted polyurethane has excellent flexibility, stretchability, form stability, and surface smoothness as well as good spinnability and ultrafineness. In addition, when the soft segment content is 75 mass or less, not only the flexibility but also the spinnability and miniaturization are good. If the intrinsic viscosity [7?] Is 0.5 or more, both spinnability and ultrafineness are good. When the intrinsic viscosity [r?] Is 1.5 or less, the melt viscosity does not become too high and a good fiber flow is formed. Appropriate amounts of additives such as anti-blocking agents, stabilizers, colorants and antistatic agents can be added to the polyurethane.
- additives such as anti-blocking agents, stabilizers, colorants and antistatic agents can be added to the polyurethane.
- the polyurethane is made into a nonwoven fabric sheet by the melt blown method.
- the melt viscosity of the melted polyurethane is preferably 500 boise or less.
- As the spinning temperature a range of 220 to 280 ° C is selected so that the melt viscosity is maintained.
- the amount of blown air is set so that the basis weight of the elastic polymer nonwoven fabric is within a desired range.
- the polyurethane for the elastic polymer sheet preferably has a thermal softening temperature in the range of 100 to 220 ° C.
- Thermal softening temperature is the molecular weight of polyurethane, especially hard segment Depending on the type and ratio of the organic diisocyanate and the chain extender, it is necessary to select appropriately in consideration of the ease of controlling the formability of the elastic polymer sheet, the desired physical properties, and the adhesion to the ultrafine fibers. preferable.
- the thermal softening temperature corresponds to the end point of the flat region indicating the rubber state in the curve indicating the temperature dependence of the storage elastic modulus obtained in dynamic viscoelasticity measurement (frequency: 11 Hz) by tension. Is calculated as the temperature to
- basis weight of the elastic polymer sheet is preferably in the range of 10 ⁇ 150gZm 2. If it is 1OgZm 2 or more, the effect of densifying the bending folds while giving the surface a feeling of swelling will be good. 1 If it is 50 gZm 2 or less, the weight of the base material for artificial leather becomes heavy, and it can be avoided that the texture becomes rubber-like and the commercial value is lowered.
- the fiber web may be subjected to one-dollar punching with a punching density of 20 to 100 punches Zcm 2 in advance so as to be easily intertwined with the elastic polymer sheet.
- the punching density is the cumulative number of felt needles pierced per unit area of the web. For example, 10 felt needles are arranged at a density of Zcm 2- the punching density when a dollar board is pierced 50 times into the web is 500 punches Zcm 2 .
- the method for integrating the fiber web and the elastic polymer sheet is not particularly limited, but when a fiber web having a high basis weight is used, the ultrafine fiber generating fibers constituting the fiber web are effectively entangled. In order to bring the two layers together at the same time, the one-punch method is preferred.
- the punching density is preferably in the range of 300 to 4000 punches / cm 2 , more preferably in the range of 500 to 3500 punches Zcm 2 . If it is 300 punches Zcm 2 or more, it will be fully integrated, and if it is 4000 punches / cm 2 or less, it will be possible to avoid deterioration of the physical properties of the fiber that forms the fiber web and the elastic polymer sheet. it can.
- the fiber of the fiber web needs to penetrate the elastic polymer sheet in the thickness direction. Therefore, when the fiber web side force-one-punch is punched, it is necessary to set the piercing depth of the needle to a depth that penetrates the elastic polymer sheet at least with the needle pub. In addition, when punching one dollar from the elastic polymer sheet side, it is necessary to set the depth so that the fiber penetrating the elastic polymer sheet is not damaged.
- At least part of the one-dollar punching process for integrating the fibrous web and the elastic polymer sheet is preferably performed by the following method. This will be described with reference to FIG. Laminated sheet 3 (fiber The brush belt 4 is placed in contact with the outer surface of the elastic polymer sheet of the web Z elastic polymer sheet. Having one or more parbs from the outer surface of the fibrous web-1 dollar 5 aligned-1 dollar punch machine 2 is used to deepen at least one parb through the elastic polymer sheet Punching is performed, and the ultrafine fiber generating fibers protruding through the elastic polymer sheet and protruding on the outer surface of the elastic polymer sheet are held in the brush of the brush belt.
- the ultrafine fiber-generating fibers protruding on the outer surface of the elastic polymer sheet are not substantially cut, and the ultrafine fiber-generating fibers in the fiber web are oriented in the thickness direction.
- the fiber web and the elastic polymer sheet can be easily laminated and integrated by interlacing the fibers and the fiber with the elastic polymer sheet.
- the protruding ultrafine fiber-generating fibers form a raised layer 6.
- This brush belt also has a brush force that is longer than the protruding length of the endless belt and the ultrafine fiber generating fiber protruding in a loop from the elastic polymer sheet formed thereon. At least in the section where one dollar punching is performed, the brush tip is arranged so as to move in the same direction as the laminated sheet while contacting the outer surface of the elastic polymer sheet.
- the ultra fine fiber generating fibers protruding from the elastic polymer sheet are stably and uniformly held in the brush, so that the elastic polymer sheet immediately after needle punching is used.
- a loop-like raised layer is formed on the outer surface, and ultrafine fiber-generating fibers are oriented with high efficiency in the thickness direction inside the fiber web.
- the needle punching method is referred to as a bellows needle.
- the purpose of adopting velor-dollar as part of the needle punching is to make the ultrafine fiber-generating fibers inside the fiber web not elastically formed with high efficiency and elastic weight, rather than by forming protruding loop-like raised on the outer surface of the elastic polymer sheet. This is because the united sheet is penetrated to effectively integrate the fiber web and the elastic polymer sheet, and the fine fiber-generating fibers inside the fiber web are efficiently oriented in the thickness direction. Therefore, a normal one-dollar punching using a metal plate (hereinafter referred to as a bed plate) with a hole through which the needle penetrates is used instead of the brush belt. - May be given after one dollar. A bellows-one dollar may be applied to the outer surface of the elastic polymer sheet.
- the raised fibers can be returned into the fiber web and the fine fiber-generating fibers can be intertwined closely.
- the velor needle is applied to both sides, the raised fibers that have returned to the fiber web are oriented in the thickness direction, so the degree of orientation of the ultrafine fiber-generating fibers in the fiber web in the thickness direction can be improved efficiently. .
- V the number of perbs is 1 to 9 in the range, and you can choose the felt needle force of the shape generally used.
- a crown needle with a shape in which three parbs are arranged at the same distance from the tip at the three apexes of a triangular blade cross section more fibers can be oriented with less punching density. .
- the first pub with a tip force of at least-$ 1 is counted. Needs to penetrate the fiber web and elastic polymer sheet into the brush.
- punching conditions are used such that the first parb reaches a depth of 3 mm or more, preferably 5 mm or more from the tip of the brush.
- Peeling density for velor-one dollar treatment is the target physical property, apparent density, fiber orientation in the thickness direction, fineness of fine fiber generation type fiber, fabric weight, use-one dollar is suitably selected such as by the shape is not particularly limited, 100 to 1000 punch 7 «11 2 ranges Shi favored I. Within the above range, the fibers are oriented efficiently, and the needle mark (stabbed—geometric pattern formed by a large number of fine holes formed by one dollar) does not become noticeable. It is also preferable to select a needle shape because it is difficult to form a needle mark.
- the dollar punching conditions are not particularly limited, and can be appropriately selected according to the target characteristics from conditions generally employed in a conventionally known method. If necessary, water jet as part of the entanglement process before or after needle punching.
- the apparent density of the laminated nonwoven fabric obtained by the entanglement treatment is preferably 0.10 g / cm 3 or more. In order to obtain the desired natural sheep leather-like flexibility in the present invention, it is preferable to make the apparent density of the laminated nonwoven fabric as low as possible.
- the apparent density of the laminated nonwoven fabric is 0.1 lOgZcm 3 or more, a uniform nonwoven fabric structure can be obtained, so that the quality in the surface direction is uniform.
- a base material for artificial leather capable of producing an artificial leather having the required physical properties and texture can be obtained.
- the apparent density is 0.10 g / cm 3 or more, a uniform and dense nonwoven fabric structure can be easily obtained.
- the apparent density of the laminated nonwoven fabric is more preferably in the range of 0.13 to 0.20 gZcm 3 .
- the apparent density was measured by measuring the mass of the laminated nonwoven fabric cut out to a certain area, calculating the mass per unit area, and then measuring the thickness with a load of 0.7 gf per lcm 2 applied to the laminated nonwoven fabric, It was calculated by dividing the mass per unit area by the thickness.
- step (3) the laminated nonwoven fabric obtained in step (2) is subjected to heat shrinkage treatment with hot water or steam. Due to the difference in shrinkage between the fiber web and the elastic polymer sheet, an elastic polymer sheet having a low shrinkage rate is randomly waved in both the MD and TD directions inside the laminated nonwoven fabric. Due to the wavy structure, it combines the softness of the surface with the softness without rebound and the softness that is not obtained by simply impregnating the inside of the fiber web with a polymer elastic body or coating the surface of the fiber web. A base material for artificial leather can be obtained which can produce a silver-like artificial leather having a rounded and densely bent crease if it is swelled.
- the fiber web and the elastic polymer sheet preferably have a shrinkage ratio such that the ratio of area retention ratio, S (A) ZS (B), is 0.3 to 0.8.
- S (A) is the area retention rate when the fiber web is heat-treated for 5 minutes in an atmosphere where the amount of water is 20% by mass of the fiber web, the temperature is 70 ° C, and the relative humidity is 95%.
- Area after shrinkage Z (area before shrinkage)) is the area retention rate when the elastic polymer sheet is heat-treated alone under the same conditions. It is important to shrink the fiber web and the elastic polymer sheet under the same conditions, and the heat treatment condition is one example. Fiber web and elastic as long as the same conditions The polymer sheet may be shrunk under other conditions.
- the water-soluble polymer sheet has a sufficiently corrugated structure, and is suitable for obtaining a texture with a flexible fiber web density! Become a range. If S (A) ZS (B) is 0.8 or less, the elastic polymer sheet has a sufficiently corrugated structure, and a base material for artificial leather having a rounded surface can be obtained. It is done. In order to further enhance the effect of the corrugated structure, the difference in the level of corrugation on the inner surface of the elastic polymer sheet observed in the vertical cross section in the TD direction is 100 m or more in the thickness direction, and is 100 to 500 m. It is preferable to be 300 m or less.
- the number of convex portions of the corrugated structure is 1.0 to 7 per 1 mm length parallel to the surface of the laminated nonwoven fabric. Further, due to the corrugated structure of the elastic polymer sheet, a gap having a height of 100 ⁇ m or more, preferably 100 to 500 ⁇ m, is formed in the thickness direction between the fiber web and the elastic polymer sheet. The preferred range is 300 m or less. The number of voids is preferably 1.0 to 5 per 1 mm in length parallel to the surface of the laminated nonwoven fabric.
- the corrugated structure of the elastic polymer sheet is formed by heat shrinkage, which is the most preferable method because of its high production stability. It is formed by shrinkage during needle punching or shrinkage in the width direction by tension during the process. It doesn't matter.
- the heat shrinking treatment gives preferably 5% by mass or more, more preferably 10% by mass or more of the PVA component contained in the composite nonwoven fabric.
- the relative humidity is preferably 75% or more, more preferably 90% or more.
- the heat shrink treatment temperature is preferably 60 ° C. or higher, more preferably 60 to 100 ° C. as the atmospheric temperature. Within this range, it is preferable because management is easy, the fiber web is greatly contracted, and a structure in which the elastic polymer sheet is sufficiently corrugated is easily obtained.
- the moisture content is greater than or equal to mass%, the plasticity of the water-soluble resin component (PVA) of the ultrafine fiber-generating fiber becomes sufficient, and sufficient shrinkage can be obtained.
- the applied water does not evaporate immediately, so that the water-soluble resin is sufficiently plasticized and sufficient shrinkage is obtained.
- the upper limit of water to be applied is not particularly limited, but it is preferable to add 50% by mass or less of the PVA component in order to prevent contamination by the dissolved PVA and to make drying efficient.
- the water application method include a method of spraying water on the laminated nonwoven fabric, a method of applying water vapor or mist-like water droplets to the laminated nonwoven fabric, and a method of applying water to the surface of the laminated nonwoven fabric.
- a method of applying water vapor or mist-like water droplets to the laminated nonwoven fabric is particularly preferred.
- the temperature at the time of application of water is preferably a temperature at which PVA does not substantially dissolve.
- heat treatment may be performed in an atmosphere with a relative humidity of 75% or more, or moisture may be applied simultaneously with the heat treatment.
- Shrinkage treatment is achieved by leaving the composite nonwoven fabric in the above-mentioned atmosphere in a state where it is as hard as possible.
- the shrinkage treatment time is preferably 1 to 5 minutes from the viewpoint of productivity, and further sufficient shrinkage can be obtained.
- the remaining PVA may be subjected to a treatment such as pressing in a plasticized or molten state.
- step (4) the heat-shrinkable composite nonwoven fabric obtained in step (3) is impregnated with a polymer elastic body and solidified.
- the composite nonwoven fabric after heat shrinkage treatment may be subjected to press treatment or surface smoothening treatment as necessary before impregnation with the high molecular elastic body. Good.
- the polymer elastic body is applied by dissolving or dispersing in a non-solvent for the elastic polymer sheet.
- the elastic polymer sheet having the polyurethane force it is preferable to use a water-based emulsion of a polymer elastic body because the processability is good.
- step (4) is performed after the step of ultrafine fiber-generating fibers (step (5)), a site where the polymer elastic body and the ultrafine fibers are bonded to each other is formed.
- step (5) a site where the polymer elastic body and the ultrafine fibers are bonded to each other is formed.
- the amount of the polymer elastic body to be applied is preferably 0.5 to 20% by mass in terms of solid content, more preferably 1 to 15% by mass with respect to the mass of the composite nonwoven fabric after the ultrafine treatment. That's right When the content is 0.5% by mass or more, the ultrafine fibers are sufficiently fixed, and the bending bend, the form stability and the surface smoothness are improved. If it is 20% by mass or less, a soft texture can be obtained and the elasticity of the polymer elastic body can be avoided, and the low resilience flexibility of natural leather can be obtained. In the present invention, it is possible to obtain a fine bent crease with a small amount of a polymer elastic body due to the effect of the tack layer B integrated with the nonwoven fabric layer A.
- the amount of the polymer elastic body impregnated is small, it is possible to obtain a base material for artificial leather that has both softness without rebound and a soft texture.
- the polymer elastic body include polyvinyl chloride, polyamide, polyester, and polyester ether copolymer. 1. Synthetic resin or natural polymer resin such as polyacrylic acid ester copolymer, polyurethane, neoprene, styrene butadiene copolymer, silicone resin, polyamino acid, polyamino acid polyurethane copolymer, or a mixture thereof. .
- pigments, dyes, crosslinking agents, fillers, plasticizers, various stabilizers and the like may be added to the polymer elastomer.
- polyurethane or a product obtained by adding other resin to this is preferably used as a polymer elastic body because a soft texture can be obtained.
- concentration of rosin in the aqueous emulsion liquid is preferably 3 to 40% by mass.
- the impregnated polymer elastic body is preferably coagulated and dried at 40-100 ° C.
- the ultrafine fiber-generating fibers in the composite nonwoven fabric are made ultrafine.
- Ultra-thinning is performed by extracting and removing sea components such as PVA components from ultra-fine fiber generating fibers.
- a dyeing machine such as a liquid dyeing machine or a jigger, or a scouring machine such as an open soaper can be used, but it is not particularly limited thereto.
- the water temperature of the extraction bath is preferably 80 to 95 ° C. It is preferable to extract and remove most or all of the sea components by repeating the operation of squeezing the composite nonwoven fabric after immersing it in the extraction bath.
- the apparent density of the base material for artificial leather obtained as described above is preferably 0.35-0.
- the base material for artificial leather is coated with silver for the surface coating layer by a known method and desired conditions, and further subjected to processing such as embossing, softening treatment, dyeing, and the like. It can be artificial leather.
- the artificial leather produced in this way combines the softness and resilience of natural leather-like resilience with a fold-like crease and a draping property derived from long fibers. For clothing, shoes, gloves, bags, basketball gloves, belts, balls or interiors such as sofas. It is suitable as a material.
- the cross-sectional area force of the fibers constituting the nonwoven fabric layer observed at a magnification of several hundred to several thousand times using a scanning electron microscope was calculated.
- the temperature was raised to 300 ° C in nitrogen at a heating rate of 10 ° CZ, cooled to room temperature, and again at 300 ° C at a heating rate of 10 ° CZ.
- the peak top temperature of the endothermic peak of the resin when the temperature was raised to C was defined as the melting point of the resin.
- a sample of 4 cm in length and width finished in artificial leather with silver finish was made, folded in half in the vertical direction with the surface outside, and then folded in two in the horizontal direction, and the sample was gripped at 1 cm from the bent part.
- the state of the bent portion generated in the central portion of the film was visually confirmed and judged according to the following criteria.
- the bent part is semicircular and has no buckling.
- Bending part is semicircular and has more than buckling repulsion.
- the bent portion has a polygonal shape and has 2 to 3 buckling folds.
- the bent part has an acute angle and one buckle.
- molten polyurethane is discharged into fine fibers by a high-speed air stream heated to a temperature of 260 ° C, and the collection distance is 40 cm on a wire mesh that moves in 4 mZ. Collected.
- the collected web was a random web having a fine fiber strength, and a polyurethane meltblown nonwoven fabric having an average basis weight of 25 gZm 2 , an average thickness of 0.05 mm, and an apparent density of 0.50 gZcm 3 was obtained.
- a 100-liter pressurized reaction vessel equipped with a stirrer, nitrogen inlet, ethylene inlet and initiator addition port was charged with 29. Okg of acetic acid and 31. Okg of methanol, heated to 60 ° C and nitrogen publishing for 30 minutes. The system was replaced with nitrogen. Next, ethylene was introduced so that the reactor pressure was 5.9 kg / cm 2 . Concentrate 2.8gZL solution of 2,2'-azobis (4-methoxy-1,2,4-dimethylvale-tolyl) (hereinafter sometimes abbreviated as AMV) in methanol as an initiator, and add nitrogen. Nitrogen substitution was performed by publishing with gas.
- AMV 2,2'-azobis (4-methoxy-1,2,4-dimethylvale-tolyl
- the above methanol solution of polyvinyl acetate was saponified at an alkali molar ratio (alkali Z vinyl acetate unit) of 0.5, then pulverized, and allowed to stand at 60 ° C. for 5 hours to further advance the kenning. Thereafter, Soxhlet extraction with methanol was carried out for 3 days, and the extract was dried under reduced pressure at 80 ° C. for 3 days to obtain purified ethylene-modified PVA.
- the average degree of polymerization was 330 when measured according to JIS K6726 of the ordinary method.
- the amount of 1,2-glycol bonds and the content of three-chain hydroxyl groups were measured with a 5000 MHz proton NMR (jEOL GX-500) apparatus, and found to be 1.50 mol% and 83%, respectively. Furthermore, a cast film with a thickness of 10 microns was prepared using a 5% aqueous solution of purified modified PVA. The film was dried under reduced pressure at 80 ° C. for 1 day, and then the melting point was measured by the above-described method using DSC.
- the water-soluble thermoplastic PVA obtained in Production Example 2 is used as the sea component, polyethylene terephthalate with an isophthalic acid modification degree of 6 mol o / o is used as an island component, and the number of islands per ultrafine fiber-generating fiber is 25 islands.
- the steel component was discharged from the die at 260 ° C so that the mass ratio of the Z component of the sea component was 30Z70.
- the ejector pressure was adjusted so that the spinning speed was 4500 mZmin, and ultrafine fiber-generating long fibers with an average fineness of 2.0 dtex were collected on a net to obtain a 30 gZm 2 long fiber web.
- the tangled long fiber web side force was also velor-dollar at a total density of 500 punches / cm 2 .
- Surododebusu using 1 Pabu needle is 0. 04Mm
- needle depth 8mm at a density of 1000 punch ZCM 2 alternately from both sides - entangled lengths performs an Dorupanchi A composite nonwoven fabric in which a fibrous web and a polyurethane nonwoven fabric were integrated was obtained.
- the composite nonwoven fabric was impregnated with a 40% aqueous emulsion of polyether polyurethane (Efanol AP-12, manufactured by Nikka Chemical Co., Ltd.), dried at 110 ° C, and the resin Z fiber ratio (mass basis) was 2Z9. Eight polymeric elastic-containing composite nonwoven fabrics were obtained. Next, PVA was dissolved and removed in hot water at 95 ° C to convert the ultrafine fiber-generating long fibers into ultrafine fibers to obtain a base material for artificial leather.
- the thickness of the nonwoven fabric layer A was 1.3 mm
- the thickness of the elastic polymer sheet constituting the cushion layer B was 75 ⁇ m
- the thickness of the ultrafine fiber layer C was 50 m.
- a 50 m thick polyurethane film prepared on release paper was attached to the obtained artificial leather substrate using a two-component urethane adhesive, and after drying and crosslinking reactions were sufficiently performed, the release film was released.
- the pattern paper was peeled off to obtain an artificial leather with silver tone.
- the single fineness of the ultrafine fibers was 0.1 dtex, and the polyurethane nonwoven fabric (cushion layer B) The nonwoven fabric was maintained, and the surface was wavy with a height difference of 250 / zm. The number of undulations was 2.7, and the gap height was 180 m.
- the obtained silver-tone artificial leather had a soft feeling without rebound and a texture with a waist, and had a folded fold with a feeling of swelling.
- Example 2 In the same manner as in Example 1, a long fiber web adjusted to have an area retention rate of 75% was produced. 18 long fiber webs were overlapped by cross-wrapping, sprayed with a needle breakage preventing oil, and then subjected to a one-punch punching process at a density of 40 punch Zcm 2 as a temporary entanglement process to obtain an entangled long fiber web. It was. Next, the polyurethane non-woven fabric (elastic polymer sheet) obtained in Production Example 1 was laminated on the velor-dollar brush belt, then the entangled long fiber web was laminated, and the needle tip force was 3 mm from the perb and the sled depth was 0.
- the needle tip force was 3 mm and the sled depth was 0.04 mm.
- the entanglement length was 8 mm and the needle depth was 1000 mm / cm 2 alternately from both sides.
- a composite nonwoven fabric in which a fiber web and a polyurethane nonwoven fabric were integrated was obtained.
- the composite non-woven fabric was applied with water in an amount of 30% by mass of PVA, and was heat-treated in an atmosphere of 95% relative humidity and 70 ° C. for 3 minutes with no tension. As a result, the composite nonwoven fabric contracted in the TD direction and MD direction, the apparent density of the composite nonwoven fabric increased, and a densified composite nonwoven fabric was obtained. The area retention rate by this heat shrinkage treatment was 75%.
- the densified composite nonwoven fabric was then pressed with a hot roll at 110 ° C. to obtain a composite nonwoven fabric having a smooth surface with a basis weight of 790 g and an apparent density of 0.55 g / cm 3 .
- the composite nonwoven fabric was impregnated with 40% aqueous emulsion of polyether polyurethane (Efanol AP-12, manufactured by Nikka Chemical Co., Ltd.), dried at 110 ° C, and the resin Z fiber ratio (mass basis) was 10Z.
- polyether polyurethane (Efanol AP-12, manufactured by Nikka Chemical Co., Ltd.)
- the resin Z fiber ratio was 10Z.
- PVA was dissolved and removed in hot water at 95 ° C to convert the ultrafine fiber-generating long fibers into ultrafine fibers, thereby obtaining a base material for artificial leather.
- the thickness of the nonwoven fabric layer A was 1.3 mm
- the thickness of the cushion layer B was 190 m
- the thickness of the ultrafine fiber layer C was 40 m.
- a 50 m thick polyurethane film prepared on release paper was adhered to the obtained artificial leather substrate using a two-component urethane adhesive, and after drying and crosslinking reactions were sufficiently performed, release paper was used.
- the artificial leather with silver tone was obtained.
- Observation of the TD and MD vertical cross sections of the resulting artificial leather with silver using an electron microscope reveals that the fineness of the ultrafine fibers is 0.1 decitex, and the polyurethane nonwoven fabric (cushion layer B) The nonwoven fabric was maintained, and the surface was wavy with a height difference of 190 m.
- the number of undulations was 1.6, and the gap height was 100 m.
- the obtained silver-tone artificial leather was a sheet having both a soft force without rebound and a texture with a waist, and a fold-up fold.
- a silver-toned artificial leather was produced in the same manner as in Example 1 except that a polyurethane nonwoven fabric was used.
- the obtained silver-tone artificial leather sheet had a folded crease that had a good texture but lacked a feeling of swelling.
- An artificial leather with silver was produced in the same manner as in Example 1 except that the heat treatment temperature was changed to 150 ° C and the area retention rate was 95%.
- the ultrafine fibers had a single fineness of 0.07 dtex, and the polyurethane nonwoven fabric maintained the nonwoven fabric state. There was almost no surface undulation, and the difference in height was 40 m. The number of undulations was 0.4, and the gap height was 20 m.
- the obtained silver-tone artificial leather had a crease that had a softness without rebound, but had a lack of fullness and a lack of swelling.
- the base material for artificial leather and the method for producing the same according to the present invention various combinations of ultrafine fibers and polymer elastic bodies constituting the artificial leather are possible, and the natural sheep A base material for artificial leather is obtained that can produce a leather-like artificial leather that has a fold-like crease and has a soft texture that has no resilience like leather and a soft texture.
- the artificial leather obtained from the artificial leather base material of the present invention can be applied to leather products such as shoes, balls, furniture, vehicle seats, clothing, gloves, baseball gloves, bags, belts, and dogs.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
- Nonwoven Fabrics (AREA)
Description
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Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/161,013 US20100159771A1 (en) | 2006-01-16 | 2007-01-15 | Base material for artificial leather and method of producing the same |
| JP2007553968A JPWO2007081003A1 (ja) | 2006-01-16 | 2007-01-15 | 人工皮革用基材およびその製造方法 |
| EP07706747A EP1978153A1 (en) | 2006-01-16 | 2007-01-15 | Base material for artificial leather and method of producing the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006-007796 | 2006-01-16 | ||
| JP2006007796 | 2006-01-16 |
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| WO2007081003A1 true WO2007081003A1 (ja) | 2007-07-19 |
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| PCT/JP2007/050413 Ceased WO2007081003A1 (ja) | 2006-01-16 | 2007-01-15 | 人工皮革用基材およびその製造方法 |
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| Country | Link |
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| US (1) | US20100159771A1 (ja) |
| EP (1) | EP1978153A1 (ja) |
| JP (1) | JPWO2007081003A1 (ja) |
| KR (1) | KR20080083317A (ja) |
| CN (1) | CN101374993A (ja) |
| TW (1) | TW200736454A (ja) |
| WO (1) | WO2007081003A1 (ja) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010196225A (ja) * | 2009-02-27 | 2010-09-09 | Kuraray Co Ltd | 人工皮革およびその製造方法 |
| JP2012207353A (ja) * | 2011-03-30 | 2012-10-25 | Kuraray Co Ltd | 皮革様基材、その製造方法、及び該皮革様基材を用いた紐 |
| JP2016069790A (ja) * | 2014-09-30 | 2016-05-09 | 東レ株式会社 | 人工皮革およびその製造方法 |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2006439B1 (en) * | 2006-02-28 | 2013-07-17 | Kuraray Co., Ltd. | Artificial leather and method for producing the same |
| EP3428340A1 (en) | 2012-02-29 | 2019-01-16 | Kuraray Co., Ltd. | Elastic artificial leather and production method therefor |
| US9657420B2 (en) | 2012-03-30 | 2017-05-23 | Deckers Outdoor Corporation | Sheared wool weaving method |
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| CN111074628B (zh) * | 2019-12-24 | 2022-09-20 | 大连工业大学 | 一种原位在线水扩链聚氨酯相变调温功能织物及其制备方法 |
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- 2007-01-15 CN CNA2007800031671A patent/CN101374993A/zh active Pending
- 2007-01-15 WO PCT/JP2007/050413 patent/WO2007081003A1/ja not_active Ceased
- 2007-01-15 KR KR1020087017022A patent/KR20080083317A/ko not_active Withdrawn
- 2007-01-15 JP JP2007553968A patent/JPWO2007081003A1/ja active Pending
- 2007-01-15 EP EP07706747A patent/EP1978153A1/en not_active Withdrawn
- 2007-01-16 TW TW096101536A patent/TW200736454A/zh unknown
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| JPH04185777A (ja) | 1990-11-16 | 1992-07-02 | Kuraray Co Ltd | 銀付人工皮革 |
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| JP2010196225A (ja) * | 2009-02-27 | 2010-09-09 | Kuraray Co Ltd | 人工皮革およびその製造方法 |
| JP2012207353A (ja) * | 2011-03-30 | 2012-10-25 | Kuraray Co Ltd | 皮革様基材、その製造方法、及び該皮革様基材を用いた紐 |
| JP2016069790A (ja) * | 2014-09-30 | 2016-05-09 | 東レ株式会社 | 人工皮革およびその製造方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20080083317A (ko) | 2008-09-17 |
| CN101374993A (zh) | 2009-02-25 |
| US20100159771A1 (en) | 2010-06-24 |
| JPWO2007081003A1 (ja) | 2009-06-11 |
| TW200736454A (en) | 2007-10-01 |
| EP1978153A1 (en) | 2008-10-08 |
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