WO2021054312A1 - 繊維と無機粒子との複合繊維を含有する顆粒 - Google Patents
繊維と無機粒子との複合繊維を含有する顆粒 Download PDFInfo
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- WO2021054312A1 WO2021054312A1 PCT/JP2020/034849 JP2020034849W WO2021054312A1 WO 2021054312 A1 WO2021054312 A1 WO 2021054312A1 JP 2020034849 W JP2020034849 W JP 2020034849W WO 2021054312 A1 WO2021054312 A1 WO 2021054312A1
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/70—Inorganic compounds forming new compounds in situ, e.g. within the pulp or paper, by chemical reaction with other substances added separately
-
- 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
- D06M23/00—Treatment of fibres, threads, yarns, fabrics or fibrous goods made from such materials, characterised by the process
- D06M23/08—Processes in which the treating agent is applied in powder or granular form
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
- C08J3/16—Powdering or granulating by coagulating dispersions
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
-
- 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
- D06M11/32—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 with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
- D06M11/36—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 with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
- D06M11/44—Oxides or hydroxides of elements of Groups 2 or 12 of the Periodic Table; Zincates; Cadmates
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- 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
- D06M11/32—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 with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
- D06M11/36—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 with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
- D06M11/46—Oxides or hydroxides of elements of Groups 4 or 14 of the Periodic Table; Titanates; Zirconates; Stannates; Plumbates
-
- 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
- D06M11/51—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 with sulfur, selenium, tellurium, polonium or compounds thereof
- D06M11/55—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 with sulfur, selenium, tellurium, polonium or compounds thereof with sulfur trioxide; with sulfuric acid or thiosulfuric acid or their salts
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
- D21H15/10—Composite fibres
- D21H15/12—Composite fibres partly organic, partly inorganic
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/71—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes
- D21H17/74—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes of organic and inorganic material
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/02—Cellulose; Modified cellulose
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- 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
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/02—Natural fibres, other than mineral fibres
- D06M2101/04—Vegetal fibres
- D06M2101/06—Vegetal fibres cellulosic
-
- 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
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/32—Polyesters
Definitions
- the present invention relates to granules containing composite fibers of fibers and inorganic particles and a method for producing the same.
- Composite fibers with various characteristics have been developed by adhering inorganic particles to the fiber surface.
- inorganic particles are attached to the surface of fibers by synthesizing inorganic substances in the presence of fibers.
- Patent Document 1 a composite fiber of calcium carbonate and fiber
- Patent Document 2 a composite fiber of magnesium carbonate and fiber
- Patent Document 3 a composite fiber of calcium phosphate and fiber
- Patent Document 3 a composite fiber of hydrotalcite and fiber
- Patent Document 4 a composite fiber of silica / alumina and fibers
- Patent Document 6 composite fibers in which most of the fiber surface is coated with inorganic particles
- Patent Document 6 composite fibers in which inorganic particles are adhered to the fiber surface to improve flame retardancy, and the like have also been reported. ..
- An object of the present invention is to provide granules containing composite fibers of fibers and inorganic particles and having excellent fluidity.
- the present invention includes, but is not limited to, the following aspects.
- the above method comprising the step of granulating 0.1 to 10 mm granules.
- the composite fibers are granulated while being dried.
- the composite fiber is granulated after the water content of the composite fiber is set to less than 60%.
- the composite fiber is finely divided and then granulated.
- the present invention it is possible to obtain granules obtained by processing a composite fiber of a fiber and an inorganic particle into granules. Since the obtained granules are excellent in fluidity and dispersibility, they can be easily blended with other products to impart functionality to the other products according to the characteristics of the inorganic particles. In particular, when inorganic particles having a high deodorizing effect are used, granules having a high deodorizing effect can be obtained. Further, by using a composite fiber of a fiber and an inorganic particle as a raw material of the granule, it is possible to impart functionality according to the characteristics of the inorganic particle while suppressing the blending amount of the inorganic particle.
- the present invention relates to granules containing composite fibers of fibers and inorganic particles.
- Granules generally refer to granules having a larger particle size than powder, and have a particle size of 0.1 mm or more.
- the granules of the composite fiber according to the present invention can be obtained, for example, by solidifying the powder into slightly large granules, and if necessary, drying or adding water to adjust the water content (solid content). May be good.
- the composite fiber of the fiber and the inorganic particles may be obtained in a state where the water content is high. In that case, the composite fiber may be dried and molded into slightly large particles to produce granules.
- Granules like powders, are less likely to generate dust or coagulate when water is added to prevent dissolution, and compared to composite fibers in the form of aqueous suspensions or pulp. It has the advantage that it can be easily distributed to other products.
- the dryer for drying the composite fiber of the synthesized fiber and the inorganic particles is not particularly limited, but for example, an air flow dryer, a band dryer, a spray dryer, a vacuum dryer, a low temperature dryer, and a rotary dryer. , Proshare mixer, oven and the like can be preferably used. Of these, it is preferable to use an apparatus such as a proshare mixer that can perform drying and granulation in parallel because it is easy to produce granules having a desired particle size from composite fibers. Further, in the present invention, the composite fiber may be finely divided and then granulated.
- the water content (moisture concentration) before granulation can be, for example, 0 to 80%, preferably 2 to 70%, more preferably 4 to 60%, and particularly preferably 6 to 50%. If the water content before granulation is too high, it will take a long time to dry and the efficiency will decrease. On the other hand, if the water content before granulation is too low, the raw materials may be uniformly dispersed depending on the device for processing the granules. Since it becomes difficult, it is more suitable for producing granules if it contains an appropriate amount of water.
- the formation of inorganic particles is captured when the size of inorganic particles exceeds the critical size after shifting from the cluster state (repeating aggregation and dispersal at the stage where the number of atoms and molecules gathered is small) to the nucleus (from the cluster to the stable assembly state). It is known that atoms and molecules do not disperse) and grow (new atoms and molecules gather in the nucleus and the particles become larger), and the higher the raw material concentration and reaction temperature, the more nucleation occurs. It is said to be easy.
- the jet velocity of the jet liquid is preferably in the range of 1 m / sec or more and 200 m / sec or less, and preferably in the range of 20 m / sec or more and 100 m / sec or less.
- the jet velocity is less than 1 m / sec, the pressure drop is low and cavitation is unlikely to occur, so the effect is weak.
- it is larger than 200 m / sec, high pressure is required and a special device is required, which is disadvantageous in terms of cost.
- the reaction can be controlled by the conductivity of the reaction solution and the reaction time, and specifically, the time during which the reaction product stays in the reaction vessel can be adjusted and controlled.
- the reaction can be controlled by stirring the reaction solution in the reaction vessel or making the reaction a multi-step reaction.
- the inorganic particles referred to here refer to compounds of metal elements or non-metal elements.
- the compound of a metal element, a metal cation (e.g., Na +, Ca 2+, Mg 2+, Al 3+, Ba 2+ , etc.) and anions (e.g., O 2-, OH -, CO 3 2-, PO 4 3-, SO 4 2-, NO 3 -, Si 2 O 3 2-, SiO 3 2-, Cl -, F -, S 2- , etc.) is Deki linked by ionic bonds, generally referred to as inorganic salts Say something.
- the compound of the non-metal element is silicic acid (SiO 2 ) or the like.
- a gas such as carbon dioxide (carbon dioxide) can be blown into the reaction vessel and mixed with the reaction solution.
- carbon dioxide gas can be supplied to the reaction solution without a gas supply device such as a fan or a blower, and the reaction can be efficiently performed because the carbon dioxide gas is miniaturized by cavitation bubbles. ..
- the pulp concentration is preferably 0.5% or more and less than 4.0%. If it is less than 0.5%, the frequency of collision of the raw materials with the fibers decreases, so that the reaction does not proceed easily, and if it is 4.0% or more, a uniform composite cannot be obtained due to poor stirring.
- the amount of Al ions supplied per hour is preferably 0.001 mol / min or more and less than 0.050 mol / min per 1 L of the reaction solution. If it is less than 0.001 mol / min, the reaction is difficult to proceed, and if it is 0.050 mol / min or more, inorganic particles liberated in the suspension are likely to be synthesized.
- the composite fiber used in the present invention is a composite of a fiber such as a cellulose fiber and an inorganic particle.
- a fiber such as a cellulose fiber and an inorganic particle.
- the cellulose fibers constituting the composite for example, not only natural cellulose fibers but also regenerated fibers (semi-synthetic fibers) such as rayon and lyocell and synthetic fibers can be used without limitation.
- raw materials for cellulose fibers include pulp fibers (wood pulp and non-wood pulp), cellulose nanofibers, bacterial cellulose, animal-derived cellulose such as squirrel, and algae. Wood pulp is produced by pulping wood raw materials. Just do it.
- non-wood-derived pulp examples include cotton, hemp, sisal hemp, Manila hemp, flax, straw, bamboo, bagus, kenaf, sugar cane, corn, rice straw, kozo, and mitsumata.
- these cellulose raw materials are further treated to carry out powdered cellulose, chemically modified cellulose such as oxidized cellulose, and cellulose nanofibers: CNF (microfibrillated cellulose: MFC, TEMPO oxide CNF, phosphoric acid esterified CNF, carboxymethylation). It can also be used as CNF, machine crushed CNF, etc.).
- the powdered cellulose used in the present invention has a constant particle size having a rod-like shape, which is produced by, for example, purifying and drying an undecomposed residue obtained after acid-hydrolyzing selected pulp, and pulverizing and sieving.
- Crystalline cellulose powder having a distribution may be used, or commercially available products such as KC Flock (manufactured by Nippon Paper Industries), Theoras (manufactured by Asahi Kasei Chemicals), and Abyssel (manufactured by FMC) may be used.
- the degree of polymerization of cellulose in powdered cellulose is preferably about 100 to 1500
- the degree of crystallinity of powdered cellulose by X-ray diffraction is preferably 70 to 90%
- the volume average particle diameter by a laser diffraction type particle size distribution measuring device Is preferably 500 nm or more and 100 ⁇ m or less.
- Cellulose nanofibers may be produced by combining one or more of the above methods.
- the fiber diameter of the produced cellulose nanofibers can be confirmed by observation with an electron microscope or the like, and is preferably in the range of 5 nm to 300 nm, for example.
- an arbitrary compound may be further added and reacted with the cellulose nanofibers to modify the hydroxyl groups. it can.
- Functional groups to be modified include acetyl group, ester group, ether group, ketone group, formyl group, benzoyl group, acetal, hemiacetal, oxime, isonitrile, allene, thiol group, urea group, cyano group, nitro group and azo group.
- Hydrogen in these substituents may be substituted with a functional group such as a hydroxyl group or a carboxy group. Further, a part of the alkyl group may have an unsaturated bond.
- the compound used for introducing these functional groups is not particularly limited, and for example, a compound having a phosphoric acid-derived group, a compound having a carboxylic acid-derived group, a compound having a sulfuric acid-derived group, and a sulfonic acid-derived compound. Examples thereof include a compound having a group of, a compound having an alkyl group, a compound having a group derived from amine, and the like.
- the compound having a phosphoric acid group is not particularly limited, and examples thereof include phosphoric acid, lithium dihydrogen phosphate which is a lithium salt of phosphoric acid, dilithium hydrogen phosphate, trilithium phosphate, lithium pyrophosphate, and lithium polyphosphate. .. Further, sodium dihydrogen phosphate, disodium hydrogen phosphate, trisodium phosphate, sodium pyrophosphate, sodium polyphosphate, which are sodium salts of phosphoric acid, can be mentioned. Further, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, tripotassium phosphate, potassium pyrophosphate, potassium polyphosphate, which are potassium salts of phosphoric acid, can be mentioned.
- Examples of the compound that is physically adsorbed include a surfactant and the like, and any of anionic, cationic and nonionic compounds may be used. If the above modification is performed before defibration and / or pulverization of cellulose, these functional groups can be eliminated after defibration and / or pulverization to return to the original hydroxyl group. By applying the above modifications, it is possible to promote the defibration of the cellulose nanofibers and to facilitate mixing with various substances when the cellulose nanofibers are used.
- the fibers shown above may be used alone or in combination of two or more.
- the fibrous material recovered from the wastewater of a paper mill may be supplied to the carbonation reaction of the present invention.
- various composite particles can be synthesized, and fibrous particles and the like can be synthesized in terms of shape.
- the composite fiber is preferably used in an amount such that 15% or more of the fiber surface is covered with inorganic particles.
- the weight ratio of the fiber to the inorganic particles is 5/95 to 95/5. It can be 10/90 to 90/10, 20/80 to 80/20, 30/70 to 70/30, 40/60 to 60/40.
- the composite fiber according to the present invention can be used in various shapes, for example, powder, pellets, molds, aqueous suspensions, pastes, sheets, boards, blocks, and other shapes. Further, it is also possible to form a molded product such as a mold or particles / pellets by using a composite fiber as a main component together with other materials.
- the dryer for drying into powder is not particularly limited, but for example, an air flow dryer, a band dryer, a spray dryer, or the like can be preferably used.
- adsorbents antibacterial materials, antiviral agents, friction materials, radiation shielding materials, flame-retardant materials, building materials, and heat insulating materials are preferable.
- the composite fiber of the present invention may be applied to papermaking applications, for example, printing paper, newspaper, inkjet paper, PPC paper, kraft paper, high-quality paper, coated paper, finely coated paper, wrapping paper, thin leaf paper, and high-quality color.
- particles generally called inorganic filler and organic filler can be used in combination.
- an inorganic filler calcium carbonate (light calcium carbonate, heavy calcium carbonate), magnesium carbonate, barium carbonate, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, clay (kaolin, calcined kaolin, deramikaolin).
- Organic fillers include urea-formalin resin, polystyrene resin, phenolic resin, microhollow particles, acrylamide composites, wood-derived substances (fine fibers, microfibril fibers, powdered kenaf), modified insolubilized starch, ungelatinized starch, etc. Can be mentioned.
- the fibers include not only natural fibers such as cellulose, but also synthetic fibers artificially synthesized from raw materials such as petroleum, recycled fibers (semi-synthetic fibers) such as rayon and lyocell, and inorganic fibers without limitation. Can be used.
- natural fibers include protein-based fibers such as wool, silk thread and collagen fiber, and composite sugar chain-based fibers such as chitin / chitosan fiber and alginic acid fiber.
- cellulosic raw material include pulp fibers (wood pulp and non-wood pulp), bacterial cellulose, animal-derived cellulose such as squirrel, and algae. Wood pulp may be produced by pulping the wood raw material.
- Wood raw materials include red pine, black pine, todo pine, spruce, beni pine, larch, fir, tsuga, sugi, hinoki, larch, shirabe, spruce, hiba, douglas fur, hemlock, white fur, spruce, balsam fur, cedar, pine, Coniferous trees such as Merck pine and Radiata pine, and their mixed materials, beech, hippopotamus, hannoki, nara, tab, shii, white hippopotamus, larch, poplar, tamo, doroyanagi, eucalyptus, mangrove, lauan, acacia and other broad-leaved trees and their mixture.
- non-wood-derived pulp examples include cotton, hemp, sisal hemp, Manila hemp, flax, straw, bamboo, bagus, kenaf, sugar cane, corn, rice straw, kozo, and mitsumata.
- the wood pulp and non-wood pulp may be either unbeaten or beaten.
- these cellulose raw materials are further treated to carry out powdered cellulose, chemically modified cellulose such as oxidized cellulose, and cellulose nanofibers: CNF (microfibrillated cellulose: MFC, TEMPO oxide CNF, phosphoric acid esterified CNF, carboxymethylation). It can also be used as CNF, machine crushed CNF).
- Examples of synthetic fibers include polyester, polyamide, polyolefin and acrylic fibers
- examples of semi-synthetic fibers include rayon and acetate
- examples of inorganic fibers include glass fibers, carbon fibers and various metal fibers. Regarding the above, these may be used alone or in combination of two or more types.
- the average particle size, shape, etc. of the inorganic particles constituting the composite fiber of the present invention can be confirmed by observation with an electron microscope. Furthermore, by adjusting the conditions for synthesizing the inorganic particles, the inorganic particles having various sizes and shapes can be complexed with the fibers.
- Cellulose fiber was used as the fiber to be complexed. Specifically, it contains broad-leaved bleached kraft pulp (LBKP, manufactured by Nippon Paper Co., Ltd., fiber width 20 ⁇ m) and softwood bleached kraft pulp (NBKP, manufactured by Nippon Paper Co., Ltd., fiber width 50 ⁇ m) in a weight ratio of 8: 2, and is a single disc refiner (SDR). ) was used to adjust the Canadian standard drainage to 300 ml.
- LLKP broad-leaved bleached kraft pulp
- NKP softwood bleached kraft pulp
- SDR single disc refiner
- An alkaline solution was added to the pulp fibers to prepare an aqueous suspension containing the pulp fibers (pulp fiber concentration: 3.0%, pH: about 12.8).
- This aqueous suspension (pulp solid content 20 kg) was placed in a reaction vessel having a volume of 1000 L, and an acid solution was added dropwise while stirring the aqueous suspension to synthesize a composite fiber of hydrotalcite fine particles and fibers.
- the reaction temperature was 50 ° C., and the dropping was stopped when the pH of the reaction solution reached about 7.5. After completion of the dropping, the reaction solution was stirred and aged for 30 minutes.
- the sample after aging was dehydrated by a centrifugal dehydrator, and 2 to 10 times the amount of water was further added, and dehydration was repeated until the electric conductivity became 100 mS / m or less to wash the composite fibers.
- Barium hydroxide octahydrate (Fujifilm Wako Pure Chemical Industries, Ltd.) was added to pulp fibers to prepare an aqueous suspension containing pulp fibers (pulp fiber concentration: 3.0%, pH: about 12.5).
- This aqueous suspension (pulp solid content 20 kg) is placed in a 1000 L reaction vessel, and sulfuric acid (prepared to Fujifilm Wako Pure Chemical Industries, Ltd., 2% aqueous solution) is added dropwise while stirring the aqueous suspension to form barium sulfate fine particles.
- a composite of and fiber was synthesized. Using an apparatus as shown in FIG. 1, the reaction temperature was 50 ° C., and the dropping was stopped when the pH of the reaction solution reached about 7.5.
- reaction solution was stirred for 30 minutes and then washed with 10 times the amount of water to remove the salt. Then, dehydration was carried out with a centrifugal dehydrator, 2 to 10 times the amount of water was further added, and dehydration was repeated until the electric conductivity became 100 mS / m or less to wash the composite fibers.
- Cu-containing Zn-based hydrotalcite Cu-containing Zn-based HT
- a mixed aqueous solution of Na 2 CO 3 Fluji Film Wako Pure Chemical Industries, Ltd.
- NaOH Fluji Film Wako Pure Chemical Industries, Ltd.
- a solution alkaline solution
- ZnSO 4 Flujifilm Wako Pure Chemical
- CuSO 4 Waako Pure Chemical
- Al 3 kinds of 2 (SO 4) 3 ⁇ 16H 2 O Fujifilm Wako Pure Chemical
- Composite fiber of copper-containing zinc-based hydrotalcite and PET fiber (sample e) A composite fiber was synthesized in the same manner as in sample d except that polyethylene terephthalate fiber (PET, fiber diameter: 1.7 decitex, fiber length: 5 mm) was used as the fiber, and the aged sample was dehydrated by a centrifugal dehydrator. The composite fibers were washed.
- PET polyethylene terephthalate fiber
- magnesium-based hydrotalcite Mg-based HT
- a solution alkaline solution
- D solution acid solution
- MgSO 4 Flujifilm Wako Pure Chemical
- Al 2 (SO 4) 3 ⁇ 16H A mixed aqueous solution of 2 O (Fuji Film Wako Pure Chemical Industries, Ltd.) was prepared.
- -Alkaline solution Solution A, Na 2 CO 3 concentration: 0.15 M, NaOH concentration: 2.4 M
- Acid solution D solution, MgSO 4 concentration: 0.9M, Al 2 (SO 4 ) 3 ⁇ 16H 2 O concentration: 0.15 M
- Pulp fibers were added to an alkaline solution to prepare an aqueous suspension containing pulp fibers (pulp fiber concentration: 2.0%, pH: about 12.7). Titanium dioxide (R-3L, manufactured by Sakai Chemical Industry Co., Ltd.) 3.5 kg was added to this aqueous suspension (pulp solid content 3 kg), and the mixture was sufficiently stirred. While stirring this aqueous suspension, the acid solution was added dropwise, the reaction temperature was set to 50 ° C., and the addition was stopped when the pH of the reaction solution reached about 7. After completion of the dropping, the reaction solution was stirred for 30 minutes and then washed with 10 times the amount of water to remove the salt. Then, dehydration was carried out with a centrifugal dehydrator, 2 to 10 times the amount of water was further added, and dehydration was repeated until the electric conductivity became 100 mS / m or less to wash the composite fibers.
- Titanium dioxide R-3L, manufactured by Sakai Chemical Industry Co., Ltd.
- Experiment 2 Production and evaluation of granules containing composite fibers 2-1.
- Production of granules containing composite fibers (Sample 1) Granules were produced using sample a as a raw material. Specifically, sample a (moisture content: about 70%) was put into a professional share mixer (WB type, Pacific Machinery & Engineering Co., Ltd.) and stirred at room temperature. Subsequently, steam was poured into the Proshare mixer to raise the temperature inside the apparatus to 80 ° C. or higher, and the mixture was dried while stirring. After drying until the water content reached about 10%, granulation was performed while adding water (finished particle size after granulation: about 0.5 mm, water content after granulation: about 50%).
- Example 2 Granulation was carried out in the same manner as in Sample 1 except that Sample b was used as a raw material. Finally, using a 0.5-1.0 mesh sieve, 0.5-1.0 mm granules were obtained. (Sample 3) The granules of Sample 2 were air-dried for 72 hours to produce granules having a moisture content of 20%. (Sample 4) Granules were produced in the same manner as in Sample 3 except that Sample a was used as a raw material.
- sample 10 It was produced in the same manner as in Sample 3 except that Sample c was used as a raw material.
- Sample 11 It was produced in the same manner as in Sample 2 except that Sample d was used as a raw material.
- Sample 12 It was produced in the same manner as in Sample 2 except that Sample e was used as a raw material.
- Sample 13 It was produced in the same manner as in Sample 2 except that Sample f was used as a raw material.
- Sample 14 Comparative example
- the water content of sample b was adjusted to about 70% using a Buchner funnel to prepare a sample.
- Example 15 Comparative example
- Water is added to 100 g of powdered cellulose (trade name: W-50, manufactured by Nippon Paper Co., Ltd., average particle size: 40 ⁇ m) and mixed by stirring, and then this wet powder (moisture content: about 5%) is rolled and granulated.
- granulation was performed while adding water (finished particle size after granulation: about 1 mm, water content after granulation: about 35%).
- the obtained granules were processed by sieving to obtain granules having a particle size of 0.5 to 1.0 mm.
- Particle size distribution A laser diffraction type particle size distribution measuring device (Mastersizer 3000, manufactured by Malvern Panalytical) was used. From the sample (0.3 to 1.0 g) used for the measurement, a particle diameter (average particle diameter) with a cumulative volume of 50% was obtained.
- the granules of the present invention had better fluidity and dispersibility as compared with the case where they were not processed into granules.
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Abstract
Description
[1] 繊維と無機粒子との複合繊維を含み、粒径が0.1~10mm、含水率が60%未満である顆粒。
[2] 安息角が30~58°である、[1]に記載の顆粒。
[3] 前記無機粒子が、カルシウム、マグネシウム、バリウムあるいはアルミニウムの金属塩、チタン、銅あるいは亜鉛を含む金属粒子、またはケイ酸塩を含む、[1]または[2]に記載の顆粒。
[4] 前記無機粒子が、ハイドロタルサイトである、[1]~[3]のいずれかに記載の顆粒。
[5] 前記顆粒における無機粒子の重量割合が10%以上である、[1]~[4]のいずれかに記載の顆粒。
[6] 前記繊維がセルロース繊維である、[1]~[5]のいずれかに記載の顆粒。
[7] 繊維表面の15%以上が無機粒子によって被覆されている、[1]~[6]のいずれかに記載の顆粒。
[8] [1]~[7]のいずれかに記載した顆粒の製造方法であって、繊維を含有する液体中で無機粒子を合成して複合繊維を得る工程と、複合繊維から、粒径が0.1~10mmの顆粒を造粒する工程と、を含む、上記方法。
[9] 前記造粒工程において、複合繊維を乾燥させながら造粒する、[8]に記載の方法。
[10] 複合繊維の含水率を60%未満にしてから造粒する、[8]に記載の方法。
[11] 複合繊維を微細化してから造粒する、[8]に記載の方法。
本発明において、セルロース繊維などの繊維を含む溶液中で無機粒子を合成することによって複合繊維を合成することができる。繊維表面が、無機粒子の析出における好適な場となり、複合繊維を合成しやすいためである。複合繊維の合成方法としては、例えば、繊維と無機粒子の前駆体を含む溶液を開放型の反応槽中で撹拌、混合して複合体を合成しても良いし、繊維と無機粒子の前駆体を含む水性懸濁液を反応容器内に噴射することによって合成してもよい。後述するが、無機物の前駆体の水性懸濁液を反応容器内に噴射する際に、キャビテーション気泡を発生させ、その存在下で無機粒子を合成してもよい。無機粒子は、それぞれ、公知の反応によってセルロース繊維上に合成することができる。
本発明に係る複合繊維を合成する場合、キャビテーション気泡の存在下で無機粒子を析出させることができる。本発明においてキャビテーションとは、流体の流れの中で圧力差により短時間に泡の発生と消滅が起きる物理現象であり、空洞現象とも言われる。キャビテーションによって生じる気泡(キャビテーション気泡)は、流体の中で圧力がごく短時間だけ飽和蒸気圧より低くなったとき、液体中に存在する100ミクロン以下のごく微小な「気泡核」を核として生じる。
本発明において、繊維と複合化する無機粒子は特に制限されないが、水に不溶性または難溶性の無機粒子であることが好ましい。無機粒子の合成を水系で行う場合があり、また、繊維複合体を水系で使用することもあるため、無機粒子が水に不溶性または難溶性であると好ましい。
炭酸カルシウムを合成する場合であれば、例えば、炭酸ガス法、可溶性塩反応法、石灰・ソーダ法、ソーダ法などによって炭酸カルシウムを合成することができ、好ましい態様において、炭酸ガス法によって炭酸カルシウムを合成する。
炭酸マグネシウムを合成する場合、炭酸マグネシウムの合成方法は、公知の方法によることができる。例えば、水酸化マグネシウムと炭酸ガスから重炭酸マグネシウムを合成し、重炭酸マグネシウムから正炭酸マグネシウムを経て塩基性炭酸マグネシウムを合成することができる。炭酸マグネシウムは合成方法によって重炭酸マグネシウム、正炭酸マグネシウム、塩基性炭酸マグネシウムなどを得ることができるが、本発明の繊維複合体に係る炭酸マグネシウムは、塩基性炭酸マグネシムにすることが特に好ましい。なぜならば、重炭酸マグネシウムは安定性が比較的低く、柱状(針状)結晶である正炭酸マグネシウムは繊維へ定着しにくい場合があるためである。一方、繊維の存在下で塩基性炭酸マグネシウムにまで化学反応させることで、繊維表面をうろこ状などに被覆した炭酸マグネシウムと繊維の繊維複合体を得ることができる。
硫酸バリウムを合成する場合、硫酸バリウム(BaSO4)で表されるバリウムイオンと硫酸イオンからなるイオン結晶性の化合物であり、板状あるいは柱状の形態であることが多く、水には難溶性である。純粋な硫酸バリウムは無色の結晶であるが、鉄、マンガン、ストロンチウム、カルシウムなどの不純物を含むと黄褐色または黒灰色を呈し、半透明となる。天然の鉱物としても得られるが、化学反応によって合成することもできる。特に、化学反応による合成品は医薬用(X線造影剤)に用いられるほか、化学的に安定な性質を応用して塗料、プラスチック、蓄電池等に広く使用されている。
ハイドロタルサイトを合成する場合、ハイドロタルサイトの合成方法は公知の方法によることができる。例えば、反応容器内に中間層を構成する炭酸イオンを含む炭酸塩水溶液とアルカリ溶液(水酸化ナトリウムなど)に繊維を浸漬し、次いで、酸溶液(基本層を構成する二価金属イオン及び三価金属イオンとを含む金属塩水溶液)を添加し、温度、pHなどを制御して共沈反応により、ハイドロタルサイトを合成する。また、反応容器内において、酸溶液(基本層を構成する二価金属イオン及び三価金属イオンを含む金属塩水溶液)に繊維を浸漬し、次いで、中間層を構成する炭酸イオンを含む炭酸塩水溶液とアルカリ溶液(水酸化ナトリウム等)を滴下し、温度、pH等を制御して共沈反応により、ハイドロタルサイトを合成することもできる。常圧での反応が一般的ではあるが、それ以外にも、オートクレーブなどを使用しての水熱反応により得る方法もある(特開昭60-6619号公報)。
アルミナおよび/またはシリカを合成する場合、アルミナおよび/またはシリカの合成方法は公知の方法によることができる。反応の出発物質として無機酸もしくはアルミニウム塩のいずれか1つ以上を用いた場合、珪酸アルカリ塩を添加して合成する。出発物質として珪酸アルカリ塩を用い、無機酸もしくはアルミニウム塩のいずれか1つ以上を添加して合成することもできるが、無機酸および/もしくはアルミニウム塩を出発物質として用いた場合の方が、生成物の繊維への定着は良好である。無機酸としては特に限定されるものではなく、例えば、硫酸、塩酸、硝酸等を用いることができる。これらの中でもコストおよびハンドリングの点から硫酸が特に好ましい。アルミニウム塩としては、硫酸バンド、塩化アルミニウム、ポリ塩化アルミニウム、ミョウバン、カリミョウバン等が挙げられ、中でも硫酸バンドを好適に用いることができる。珪酸アルカリ塩としては、珪酸ナトリウムもしくは珪酸カリウムなどが挙げられるが、入手しやすいため珪酸ナトリウムが好適である。珪酸とアルカリのモル比はいずれでも良いが、一般に3号珪酸として流通しているものはSiO2:Na2O=3~3.4:1程度のモル比のものであり、これを好適に用いることができる。
水酸化アルミニウムはAl(OH)3で表されるアルミニウムイオンと水酸化物イオンからなるイオン結晶性の化合物であり、粒状の形態であることが多く、水には難溶性である。化学反応による合成品は医薬品や吸着剤に用いられるほか、加熱時に水を放出する性質を利用して難燃化剤や不燃化剤として用いられる。
本発明で使用する複合繊維は、セルロース繊維などの繊維と無機粒子とを複合化したものである。複合体を構成するセルロース繊維としては例えば、天然のセルロース繊維はもちろん、レーヨンやリヨセルなどの再生繊維(半合成繊維)や合成繊維などを制限なく使用することができる。セルロース繊維の原料としては、パルプ繊維(木材パルプや非木材パルプ)、セルロースナノファイバー、バクテリアセルロース、ホヤなどの動物由来セルロース、藻類などが例示され、木材パルプは、木材原料をパルプ化して製造すればよい。木材原料としては、アカマツ、クロマツ、トドマツ、エゾマツ、ベニマツ、カラマツ、モミ、ツガ、スギ、ヒノキ、カラマツ、シラベ、トウヒ、ヒバ、ダグラスファー、ヘムロック、ホワイトファー、スプルース、バルサムファー、シーダ、パイン、メルクシマツ、ラジアータパイン等の針葉樹、及びこれらの混合材、ブナ、カバ、ハンノキ、ナラ、タブ、シイ、シラカバ、ハコヤナギ、ポプラ、タモ、ドロヤナギ、ユーカリ、マングローブ、ラワン、アカシア等の広葉樹及びこれらの混合材が例示される。
1-1.亜鉛系ハイドロタルサイトと繊維の複合繊維(サンプルa、b)
ハイドロタルサイト(Zn系HT)を合成するための溶液を準備した。アルカリ溶液(A溶液)として、Na2CO3(富士フイルム和光純薬)およびNaOH(富士フイルム和光純薬)の混合水溶液を調製した。また、酸溶液(B溶液)として、ZnSO4(富士フイルム和光純薬)およびAl2(SO4)3・16H2O(富士フイルム和光純薬)の混合水溶液を調製した。
・アルカリ溶液(A溶液、Na2CO3濃度:0.05M、NaOH濃度:0.8M)
・酸溶液(B溶液、Zn系、ZnSO4濃度:0.9M、Al2(SO4)3・16H2O濃度:0.15M)
サンプルaと同様に、カナダ標準濾水度を300mlに調整したパルプ繊維(LBKP:NBKP=8:2)を用いた。
サンプルaと同様に、カナダ標準濾水度を300mlに調整したパルプ繊維(LBKP:NBKP=8:2)を用いた。
・アルカリ溶液(A溶液、Na2CO3濃度:0.05M、NaOH濃度:0.8M)
・酸溶液(C溶液、ZnSO4濃度:0.75M、CuSO4濃度:0.15M、Al2(SO4)3・16H2O濃度:0.15M)
上記薬品を用いた以外は、サンプルaと同様に複合繊維を合成し、熟成後のサンプルを遠心脱水機にて脱水して複合繊維を洗浄した。
繊維にポリエチレンテレフタレート繊維(PET、繊維径:1.7デシテックス、繊維長:5mm)を用いた以外は、サンプルdと同様に複合繊維を合成し、熟成後のサンプルを遠心脱水機にて脱水して複合繊維を洗浄した。
サンプルaと同様に、カナダ標準濾水度を300mlに調整したパルプ繊維(LBKP:NBKP=8:2)を用いた。
・アルカリ溶液(A溶液、Na2CO3濃度:0.15M、NaOH濃度:2.4M)
・酸溶液(D溶液、MgSO4濃度:0.9M、Al2(SO4)3・16H2O濃度:0.15M)
下記の手順に基づいて、複合繊維サンプルを評価した。
(1)表面被覆率
得られた複合繊維を電子顕微鏡で観察した(サンプルa:図2、サンプルb:図3、サンプルc:図4、サンプルd:図5、サンプルf:図6)。いずれのサンプルも、繊維表面の約70%が無機粒子によって被覆されていた。
(2)含水率(水分率)
サンプルを105℃で2時間乾燥させ、乾燥によって減少した重量から含水率を算出した。なお、固形分(濃度)は「100-含水率」である。
(3)繊維と無機粒子の重量比
105℃で2時間乾燥させたサンプルについて、JIS P 8251:2003に基づいて複合繊維の灰分を測定し、複合繊維を構成する繊維と無機粒子の重量比を算出した。
2-1.複合繊維を含有する顆粒の製造
(サンプル1)
サンプルaを原料として顆粒を製造した。具体的には、サンプルa(含水率:約70%)をプロシェアミキサー(WB型、大平洋機工)に投入し、常温で攪拌した。続いて、プロシェアミキサー内に蒸気を投入して装置内の温度を80℃以上とし、攪拌しながら乾燥した。含水率が約10%になるまで乾燥してから、水を加えながら造粒した(造粒後の仕上がり粒径:約0.5mm、造粒後の含水率:約50%)。0.5メッシュの篩を用いて、最終的に、粒径が0.5mm以下の顆粒を得た。
(サンプル2)
サンプルbを原料とした以外は、サンプル1と同様に造粒した。0.5~1.0メッシュの篩を用いて、最終的に、0.5~1.0mmの顆粒を得た。
(サンプル3)
サンプル2の顆粒を、72時間、風乾させて、含水率が20%の顆粒を製造した。
(サンプル4)
サンプルaを原料とすること以外は、サンプル3と同様にして顆粒を製造した。
(サンプル5)
サンプルbを原料として使用し、造粒後の仕上がり粒径を1.0mmとした以外は、サンプル2と同様に造粒した。1.0~3.0メッシュの篩を用いて、最終的に、粒径が1.0~3.0mmの顆粒を得た。
(サンプル6)
サンプル5の顆粒を、72時間、風乾させて、含水率が20%の顆粒を製造した。
(サンプル7)
サンプルaを原料とすること以外は、サンプル5と同様に顆粒を製造した。
(サンプル8)
サンプルbを原料として使用し、造粒後の仕上がり粒径を3.0mmとした以外は、サンプル3と同様に造粒した。3.0~4.0メッシュの篩を用いて、最終的に、粒径が3.0~4.0mmの顆粒を得た。
(サンプル9)
サンプルb(含水率:約70%)を、含水率が10%以下になるまで乾燥させてから、さらにカッターミルを用いて約0.5mm以下の大きさまで微細化処理した。処理後のサンプルを転動造粒機(CF-360N、フロイント産業)に添加し、水を加えながら造粒した(造粒後の仕上がり粒径:約1.0mm、造粒後の含水率:約20%)。1.0~3.0メッシュの篩を用いて、最終的に、粒径が1.0~3.0mmの顆粒を得た。
(サンプル10)
サンプルcを原料とすること以外は、サンプル3と同様に製造した。
(サンプル11)
サンプルdを原料とすること以外は、サンプル2と同様に製造した。
(サンプル12)
サンプルeを原料とすること以外は、サンプル2と同様に製造した。
(サンプル13)
サンプルfを原料とすること以外は、サンプル2と同様に製造した。
(サンプル14:比較例)
ブフナー漏斗を用いてサンプルbの含水率を約70%に調整してサンプルとした。
(サンプル15:比較例)
粉末状セルロース100g(商品名:W-50、日本製紙製、平均粒子径:40μm)に水を加えて撹拌混合してから、この湿潤粉末(含水率:約5%)を、転動造粒機を用いて、水を加えながら造粒した(造粒後の仕上がり粒径:約1mm、造粒後の含水率:約35%)。得られた造粒物を篩いにて処理し、粒径が0.5~1.0mmの顆粒を得た。
下記の評価手順に基づいて、サンプルを評価した。
(1)含水率(水分率)、無機分の重量割合
実験1と同様にして含水率(%)を測定した。また、無機分の重量割合(%)についても、実験1と同様に繊維と無機粒子の重量比を測定して算出した。
粉体物性測定機(ホソカワミクロン製、パウダーテスターPT-X型)を用いて、付属の金属製ロート(φ5mm)から、振動目盛1.5の条件で粉体サンプルを落下させ、粉体の作る山の稜線角度を角度計測方式の「Peak Operation」で測定し、安息角とした。
安息角が測定可能であれば「流動性あり」、測定不可であれば「流動性なし」と評価した。また、安息角の数値が低いほど、流動性に優れているといえる。
ポリ袋(170mm×240mm)に、塩化ナトリウム90gとサンプル10gを添加し、3分間、手動で混合する。混合物から10gを取り、200mlの蒸留水を添加し、スターラーを用いて塩化ナトリウムを溶解させる。ろ紙(JIS P3801、定量分析用、5種B)を用いて、処理後の溶液をろ過し、ろ紙上の残渣を50℃で2時間緊張乾燥させて、混合物10g中に含まれる顆粒の重量を測定した。「乾燥後の顆粒の重量/1g×100」という式に基づいて分散率を算出し、70%以上を合格(○)、70%未満を不合格(×)とした。
一定容積内に軽く充填した質量を計測し、容積で除した値を『かさ密度(ゆるみかさ密度)』とした。具体的には、1000mLのメスシリンダーにサンプルを1000mLの目盛りまで充填した際の質量を計測し、かさ密度(g/cm3)の値を算出した。
レーザー回析式粒度分布測定装置(マスターサイザー3000、Malvern Panalytical社製)を使用した。測定に用いる試料(0.3~1.0g)から体積累計50%粒子経(平均粒子径)を得た。
Claims (11)
- 繊維と無機粒子との複合繊維を含み、粒径が0.1~10mm、含水率が60%未満である顆粒。
- 安息角が30~58°である、請求項1に記載の顆粒。
- 前記無機粒子が、カルシウム、マグネシウム、バリウムあるいはアルミニウムの金属塩、チタン、銅あるいは亜鉛を含む金属粒子、またはケイ酸塩を含む、請求項1または2に記載の顆粒。
- 前記無機粒子が、ハイドロタルサイトである、請求項1~3のいずれかに記載の顆粒。
- 前記顆粒における無機粒子の重量割合が10%以上である、請求項1~4のいずれかに記載の顆粒。
- 前記繊維がセルロース繊維である、請求項1~5のいずれかに記載の顆粒。
- 繊維表面の15%以上が無機粒子によって被覆されている、請求項1~6のいずれかに記載の顆粒。
- 請求項1~7のいずれかに記載の顆粒を製造する方法であって、
繊維を含有する液体中で無機粒子を合成して複合繊維を得る工程と、
複合繊維から、粒径が0.1~10mmの顆粒を造粒する工程と、
を含む、上記方法。 - 前記造粒工程において、複合繊維を乾燥させながら造粒する、請求項8に記載の方法。
- 複合繊維の含水率を60%未満にしてから造粒する、請求項8に記載の方法。
- 複合繊維を微細化してから造粒する、請求項8に記載の方法。
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| JP2021546906A JP7608347B2 (ja) | 2019-09-20 | 2020-09-15 | 繊維と無機粒子との複合繊維を含有する顆粒 |
| CN202080053104.2A CN114174388B (zh) | 2019-09-20 | 2020-09-15 | 含有纤维与无机粒子的复合纤维的颗粒 |
| JP2024220586A JP7758838B2 (ja) | 2019-09-20 | 2024-12-17 | 繊維と無機粒子との複合繊維を含有する顆粒 |
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| JPWO2021054312A1 (ja) | 2021-03-25 |
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