KR102000273B1 - Skin material for inner trim of automobile and the manufacturing method - Google Patents

Abstract

Wherein the embossed layer comprises hemispherical embossed micro embosses on the surface and the surface roughness Ra of the embossed layer is 30 to 70 占 퐉. Applying an anti-impregnation composition on one side of the layer and then thermally curing it to form an anti-impregnation layer; Applying an embossed composition to one surface of the anti-impregnation layer and then thermally curing the embossed composition to form an embossed layer.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a skin material for automobile interior materials,

To a skin material for an automobile interior material and a method for manufacturing the same.

In general, the types of epidermis used for the automobile interior material of suede texture include types using nonwoven fabrics or knits, types using polyvinyl chloride (PVC), materials using thermoplastic olefins (TPO) Type, high-grade leather with natural leather, or urethane type.

Therefore, at present, it is applied considering the price and physical properties of automobiles. Although natural leather products are mainly applied to high-priced models, there is a problem that it is difficult to expand the product due to the unstable price and supply-demand problems, and the development of artificial leather having a texture similar to that of natural leather It is proceeding before.

In order to produce artificial leather having a suede texture for replacing natural leather, urethane dry method using urethane resin has been used in the related art. However, artificial leather according to the above method has a disadvantage in that the surface texture is poor and light resistance and heat resistance There was a disadvantage.

One embodiment of the present invention provides a skin material for an automobile interior material that is excellent in brushed effect and provides a suede texture.

Another embodiment of the present invention provides a method of manufacturing a skin material for automobile interior materials that can improve the elongation and roughness of a skin material for an automobile interior material.

In one embodiment of the present invention, the emboss layer includes a base layer, an anti-impregnation layer and an emboss layer, the emboss layer includes a hemispherical embossed micro emboss on the surface, and the emboss layer has a surface roughness Ra of 30 mu m to 70 mu m Thereby providing a skin material for an interior material.

And at least a part of the anti-impregnation layer overlaps with the substrate layer.

The skin material for an automobile interior material may have an elongation of 8% to 20%.

The emboss layer may comprise a thermoset material of an embossed composition comprising a polycarbonate polyurethane resin, water, a crosslinking agent and a capsule-like foaming agent.

The polycarbonate polyurethane resin may contain 20 to 60% by weight of structural units derived from a carbonate.

The embossed composition may include 50 to 60 parts by weight of the polycarbonate polyurethane resin based on 100 parts by weight of solids.

The embossed composition may contain 3 to 5 parts by weight of the encapsulated foaming agent based on 100 parts by weight of solids.

The polycarbonate polyurethane resin may have a weight average molecular weight of 25,000 to 40,000.

The polycarbonate polyurethane resin may have a glass transition temperature of -20 캜 to 10 캜.

The capsule-type foaming agent may have a particle diameter of 40 to 150 mu m after foaming.

Wherein the core of the encapsulated foaming agent is selected from the group consisting of isobutane, n-butane, n-pentane, isopentane, n-hexane, petroleum ether, Wherein the shell of the encapsulated foaming agent comprises one selected from the group consisting of low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, vinyl chloride, ethylene-methyl methacrylate copolymer and combinations thereof can do.

The maximum foaming temperature of the capsular foaming agent may be 160 ° C to 180 ° C.

The crosslinking agent may be one selected from the group consisting of isocyanates, carbodiimides, and combinations thereof.

The embossing composition may further comprise one selected from the group consisting of polymer beads, polyolefins, siloxanes, polyurethanes, crosslinking agents, and combinations thereof.

The embossed composition may have a viscosity of 350 cp to 600 cp at 25 ° C.

The embossed layer may have a thickness of 100 탆 to 150 탆.

The anti-impregnation layer may comprise a thermocompound of an anti-impregnation composition comprising a polycarbonate polyurethane resin, water, a sedative and a leveling agent.

The substrate layer may comprise one selected from the group consisting of a nonwoven fabric, a textile fabric, a polyester, and combinations thereof.

In another embodiment of the present invention, an anti-impregnation composition is applied to one side of the substrate layer and the anti-impregnation layer is formed by primary thermal curing; And applying an embossed composition to one surface of the anti-impregnation layer and then thermally curing the embossed composition to form an embossed layer.

The anti-impregnation composition may be applied to one side of the substrate layer, and at least a part of the anti-impregnation composition may be impregnated into the substrate layer, followed by thermosetting to form the anti-impregnation layer.

The primary thermosetting may be performed by heat treating at 80 ° C to 130 ° C for 50 seconds to 60 seconds and the secondary thermosetting may be performed by heat treating at 160 ° C to 180 ° C for 3 minutes to 4 minutes.

The skin material for automobile interior material is excellent in brushed effect and maximizes suede texture effect. Specifically, the number of hemispherical embossed micro embosses included in the surface of the skin material for automobile interior material is increased, so that the brushed effect is excellent, and as a result, the effect of improving the suede texture is realized.

The method for manufacturing the skin material for automobile interior materials can improve the surface roughness (Ra) by forming the impregnation prevention layer and improve the elongation of the skin material for automobile interior material by using the porous base material layer.

1 is a schematic cross-sectional view of a skin material for an automobile interior material according to an embodiment of the present invention.
2 is a microscope photograph of the surface of a skin material for an automobile interior material according to Example 1 of the present invention.
3 is an electron microscope (SEM) photograph of the surface of a skin material for an automobile interior material according to Example 1 of the present invention.
Fig. 4 is a microscopic photograph of the surface of the skin material for automobile interior material in the absence of the impregnation preventing layer.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art to which the invention pertains. Only. Like reference numerals refer to like elements throughout the specification.

In the drawings, the thickness is enlarged to clearly represent the layers and regions. In the drawings, for the convenience of explanation, the thicknesses of some layers and regions are exaggerated.

It will also be understood that when a layer, film, region, plate, or the like is referred to as being "on" or "over" another portion, . Conversely, when a part is "directly over" another part, it means that there is no other part in the middle. In addition, when a layer, film, region, plate, or the like is referred to as being "under" or "under" another portion, . Conversely, when a part is "directly underneath" another part, it means that there is no other part in the middle.

In one embodiment of the present invention, the embossing layer comprises a base layer, an anti-impregnation layer and an embossing layer, the embossing layer having a hemispherical embossed microemboss on its surface, wherein the embossing layer has a surface roughness (Ra) Mu m in thickness.

1 is a schematic cross-sectional view of a skin material for an automobile interior material according to an embodiment of the present invention.

1, the automotive interior material 100 may have a multi-layered structure including a base layer 110, an anti-impregnation layer 120, and an embossed layer 130.

The skin member 100 for an automobile interior material according to an embodiment of the present invention includes the base layer 110, the impregnation prevention layer 120, and the emboss layer 130, and the emboss layer may include a hemispherical embossed fine emboss It is possible to realize an excellent brushed effect, and as a result, the skin material for automobile interior material shows an improved suede texture, and at the same time, the moldability and the durability are improved.

The embossed layer is externally exposed as an outermost layer of the skin material for the automobile interior material, and includes hemispherical fine embossing to provide a suede texture.

The term "hemispherical microembossed" refers collectively to a three-dimensional shape formed on the surface of the embossed layer. The term "hemispherical" does not necessarily mean a geometrically semicircular half, and at least a part of a spherical or capsule- As used herein refers to a shape formed by exposure to < RTI ID = 0.0 >

2 is a microscope photograph of the surface of a skin material for an automobile interior material according to an embodiment of the present invention.

Referring to FIG. 2, the hemispherical micro emboss may be formed in various sizes on the surface of the emboss layer.

The hemispherical fine emboss may be formed on the embossed layer surface. Since the hemispherical fine embossing is formed on the surface of the embossing layer in various sizes, the surface of the embossing layer can be effectively brushed and uniform brushed effect can be realized on the whole surface. In addition, the surface elasticity and impact resistance can be improved by bending formed on the surface of the embossed layer, and a smooth surface touch can be realized.

The surface roughness Ra of the embossed layer may be from about 30 탆 to about 70 탆, for example, from about 45 탆 to about 63 탆. By maintaining the surface roughness range of the embossed layer, it is possible to improve the brushed effect while having suitable surface hardness and durability, thereby maximizing the suede texture and realizing excellent elongation and smooth surface touch.

When the embossed layer is less than the surface roughness range, sufficient microembossing is not formed on the surface of the embossed layer, resulting in deterioration of the brushed effect, resulting in degradation of the suede texture, and deterioration of abrasion resistance. If the emboss layer is out of the surface roughness range, the hemispherical micro emboss can be separated from the emboss layer due to external friction or physical impact, which may lower the surface hardness and durability, .

In the case of conventional skin materials for automobile interior materials, substances which are harmful to the human body can be discharged by using the oil-based urethane resin, and it may also be a problem in terms of environmental friendliness. On the other hand, the embossed layer can use an aqueous urethane resin instead of the oil-based urethane resin to produce an environmentally friendly skin material that is harmless to the human body.

The emboss layer may comprise a thermoset material of an embossed composition comprising a polycarbonate polyurethane resin, water, a crosslinking agent and a capsule-like foaming agent. The polycarbonate polyurethane resin may be dispersed in water and used in the form of a water-dispersed polycarbonate polyurethane resin. The embossed composition uses water, which is not an organic solvent, to produce volatile organic compounds (VOC) It is possible to manufacture ash and minimize the generation of odor, thereby improving usability.

The embossed composition includes the polycarbonate polyurethane resin, and the polycarbonate polyurethane resin has less moisture loss than the other polyurethane resins and can realize excellent durability. The embossed composition plays a role of forming the basic structure of the embossed layer can do.

The embossed composition may include about 50 parts by weight to about 60 parts by weight of the polycarbonate polyurethane resin based on 100 parts by weight of solids. When the polycarbonate polyurethane resin of the embossed composition is in the above-mentioned weight range, the embossed layer can maintain proper surface hardness and elasticity, and is easy to ensure excellent abrasion resistance and stain resistance. When the polycarbonate polyurethane resin of the embossed composition is less than the above-mentioned weight range, the embossed layer can be easily peeled off, resulting in deterioration of durability and degradation of scratch resistance. If the polycarbonate polyurethane resin of the embossed composition is in the above-mentioned weight range, wrinkles may occur on the embossed layer, the suede texture effect on the surface may be deteriorated, and whitening may occur.

The skin material for automobile interior materials may be exposed to a high temperature environment in an automobile interior material manufacturing process. At this time, the embossed composition can improve heat resistance and hydrolysis resistance by using a polycarbonate polyurethane resin, and can exhibit excellent physical property stability even when exposed to a high temperature environment in the automobile interior material manufacturing process.

The polycarbonate polyurethane resin is a block copolymer of polycarbonate and polyurethane. At this time, the polycarbonate has excellent compatibility with the polyurethane, and by using the resin formed by the block copolymerization of the polycarbonate, the emboss layer can realize excellent durability, and the improved heat resistance and hydrolysis resistance are realized, It is possible to obtain an advantage that the deformation is prevented, the quality of the product is maintained excellent, and the wear resistance is improved.

The polycarbonate polyurethane resin may comprise about 20% to about 60% by weight of polycarbonate-derived structural units. The above polycarbonate polyurethane resin can contain the polycarbonate-derived structural unit in the content within the above range to realize the effect of improving the heat resistance and hydrolysis resistance without lowering the hardness and elasticity of the emboss layer, . When the polycarbonate polyurethane resin contains the polycarbonate-derived structural unit in an amount less than the above range, the heat resistance and hydrolysis resistance are lowered, resulting in lower process stability and difficulty in maintaining the quality of the product, and degradation of scratch resistance Problems can arise. When the content of the structural unit derived from polycarbonate exceeds the above range, the elasticity and moldability of the embossed layer may be deteriorated and the elongation may be lowered.

The polycarbonate polyurethane resin may have a weight average molecular weight of about 25,000 to about 40,000. The polycarbonate polyurethane resin can realize excellent durability and adhesion by keeping the weight-average molecular weight range, and is easy to realize excellent abrasion resistance and scratch resistance. If the polycarbonate polyurethane resin is less than the weight average molecular weight range, the hardness and mechanical properties of the embossed layer may be deteriorated and the abrasion resistance may be deteriorated. If the polycarbonate polyurethane resin has a weight average molecular weight in excess of the above range, the moldability and the dispersibility of the encapsulated foaming agent may be lowered and whitening may occur.

The polycarbonate polyurethane resin may have a glass transition temperature of about -20 캜 to about 10 캜. The polycarbonate polyurethane resin can maintain the durability and the surface suede texture even at a high temperature by maintaining the above glass transition temperature range, and an excellent elongation can be realized. When the polycarbonate polyurethane resin is below the glass transition temperature range, mechanical properties and surface suede texture of the embossed layer may be degraded when exposed to a high-temperature process or an external environment, and the problem of degradation of the scratch resistance Lt; / RTI > If the polycarbonate polyurethane resin is above the glass transition temperature range, difficulties may arise in the process, and flexibility and embossing of the embossed layer may be deteriorated.

In general, a skin material for an automobile interior material can be produced using mechanical foaming and chemical foaming to realize a suede texture. In the case of general mechanical foaming, there is a problem that the uniformity and fineness of the porous structure are remarkably deteriorated. In addition, general chemical foaming is a gas releasing type foaming agent, in which the foaming agent is expanded by heat and bursts to release gases contained therein to form a pore structure. Such a gas releasing type foaming agent may be harmful to the human body, and there is a problem that the shape of pores is uneven.

Accordingly, in one embodiment of the present invention, an expandable foaming agent is used. The expandable foaming agent is expanded by heat to form a pore structure by itself, unlike the gas-releasing foaming agent, does not burst or disappear during the foaming process.

More specifically, the expandable foaming agent may be a capsular foaming agent, and the capsular foaming agent may be expanded by heat to form the hemispherical microemboss on the surface of the embossed layer.

Specifically, the encapsulated foaming agent contained in the embossed composition expands when the embossed composition is thermally cured to form a spherical or capsule-like shape in the embossed layer. At least a part of the spherical or capsular shape is exposed to the surface of the embossed layer to realize a brushed effect, and as a result, a suede texture can be exhibited on the embossed layer surface.

The capsule type foaming agent may have a particle diameter of about 40 탆 to about 150 탆 after foaming. By maintaining the particle diameter of the capsular foaming agent after the foaming, the effective brassy effect can be realized, the elasticity and impact resistance of the embossed layer can be increased, and a superior suede texture effect can be secured. When the particle diameter of the capsule type foaming agent after foaming is less than the above range, the suede texture effect of the embossed layer may be deteriorated. If the particle size of the encapsulated foaming agent after foaming exceeds the above range, the suede texture and hardness of the surface of the embossed layer may be lowered, and the encapsulated foaming agent may be detached from the embossed layer.

The encapsulated foaming agent may have an expansion ratio of about 400% to about 600%. The expansion ratio (expansion ratio _{= (V 2 -V 1) *} 100 / V 1) is foamed around the volume of the capsule type blowing agent, that is the volume of the heat before applying the (V ₁₎ after foaming of blowing agent compared to the capsule, That is, the rate of change of the volume (V ₂ ) after applying heat. The capsule type foaming agent can improve the dispersibility and the brushed effect of the capsule type foaming agent by keeping the expansion rate range, and the thickness of the embossed layer can be increased to improve the impact resistance, and the excellent suede feeling can be realized The advantage can be secured.

The capsular foaming agent may be a core-shell structure. That is, the capsule type foaming agent has a structure composed of a core containing a gas and a shell surrounding the core.

Specifically, the core of the encapsulated foaming agent includes one selected from the group consisting of isobutane, n-butane, n-pentane, isopentane, n-hexane, petroleum ether and combinations thereof, The shell of the blowing agent may include but is not limited to one selected from the group consisting of low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, vinyl chloride, ethylene-methyl methacrylate copolymer and combinations thereof.

The shell of the capsular foaming agent may be about 2 탆 to about 10 탆 in thickness. By keeping the shell of the capsular foaming agent in the above range, the suede texture can be suitably realized without lowering the foaming performance.

Since the core and the shell of the capsular foaming agent each contain the above components, the capsular foaming agent can be expanded at an appropriate expansion ratio without breaking the process, and a proper size Fine emboss can be implemented.

The maximum foaming temperature of the capsular foaming agent may be about 160 ° C to about 180 ° C. The "maximum foaming temperature" means the temperature at which the capsular foaming agent is in the form of the largest spherical or capsule possible while retaining its spherical or capsule shape. By maintaining the maximum foaming temperature range of the encapsulated foaming agent, the embossing effect can be improved by increasing the foaming efficiency during thermal curing of the embossed composition, and it is easy to secure excellent abrasion resistance and scratch resistance. If the encapsulating foaming agent is below the maximum foaming temperature range, the embossing composition may not be sufficiently foamed during the thermal curing of the embossed composition, resulting in deterioration of the brushed effect, thereby deteriorating the durability of the embossed layer. If the capsule type foaming agent has a temperature exceeding the maximum foaming temperature range, the thermal hardening temperature for achieving the brushed effect may be excessively high, which may cause difficulties in the process, and the problem that the hydrocarbon in the core shell passes through the shell, May occur.

The embossed composition may include about 3 parts by weight to about 5 parts by weight of the encapsulated foaming agent based on 100 parts by weight of solids. When the encapsulated foaming agent is included in the above-mentioned weight range, it is possible to realize a brushed effect and the thickness of the emboss layer becomes thick, so that proper impact resistance and workability can be improved, and excellent elongation and excellent suede feeling can be ensured . If the capsule type foaming agent is less than the above weight part range, the brushed effect may be deteriorated. If the encapsulated foaming agent is in the above weight part range, the emboss layer may have a low durability and a dispersibility may be deteriorated.

The embossed composition includes a crosslinking agent, which can improve the hardness and durability of the embossed layer.

The crosslinking agent may be one selected from the group consisting of isocyanate, carbodiimide, and combinations thereof, but is not limited thereto. The crosslinking agent may be hardened after the capsule foaming agent is sufficiently foamed due to a slow curing rate.

The embossing composition may include about 3 parts by weight to about 5 parts by weight of the crosslinking agent based on 100 parts by weight of solids. Since the embossed composition includes the cross-linking agent in the above-mentioned weight range, the emboss layer maintains proper hardness and durability as well as excellent abrasion resistance and scratch resistance, and does not interfere with foaming of the capsule type foaming agent, .

The embossing composition may further comprise one selected from the group consisting of polymer beads, polyolefins, siloxanes, polyurethanes, crosslinking agents, and combinations thereof.

Specifically, the cross-linking agent may be an isocyanate-based plasticizer or a carbodimide-based plasticizer.

The embossed composition may have a viscosity of about 350 cp to about 600 cp at about 25 ° C. By maintaining the viscosity of the embossed composition in the above range, it is possible to obtain excellent moldability and dispersibility, and to secure excellent storage stability and workability. When the embossed composition has a viscosity lower than the above range, it is difficult to control the thickness of the embossed layer and the coating property may be deteriorated. If the embossed composition has a viscosity in the above range, the moldability of the embossed composition and the foaming of the encapsulated foaming agent may be deteriorated and the workability may be deteriorated.

The embossed layer may include a thermoset material of the embossed composition, and the embossed layer may have a thickness of about 100 탆 to about 150 탆. The "thickness" may refer to the thickness of the coating layer on the backing cloth. By maintaining the emboss layer in the thickness range, it is possible to have appropriate impact resistance and durability and to realize excellent abrasion resistance. If the embossed layer is less than the above-mentioned thickness range, the durability of the embossed layer may not include a sufficient encapsulated foaming agent, and the brushed effect may be deteriorated and the scratch resistance may be weakened. If the thickness of the emboss layer exceeds the above range, the adhesion between the emboss layer and the other interface may be deteriorated, and the extensibility may be degraded.

The automotive interiorsic skin material includes an impregnation preventing film, which prevents the capsule type foaming agent from being impregnated with the base material layer.

Specifically, by preventing the encapsulating foaming agent from being impregnated with the substrate layer, the embossing layer can include a sufficient amount of the encapsulating foaming agent, and the thickness of the embossing layer is increased by the foamed encapsulating foaming agent The mechanical properties are improved and the unexpected effect on the surface of the embossed layer can be maximized and excellent abrasion resistance can be ensured.

For example, the skin material for automobile interior materials may have a larger content of the encapsulating foaming agent contained in the embossed layer than the case where the anti-impregnation layer is not included, and the surface of the embossed layer may include a larger number of hemispherical microembossed So that the surface roughness is improved and the brushed effect is maximized. As a result, the skin material for automobile interior material can realize the suede texture more easily.

The anti-impregnation layer may have a structure in which at least a part thereof overlaps with the substrate layer.

As described later, the impregnation preventing layer may be prepared by applying and curing an impregnation preventing composition for forming the same on one surface of the substrate layer. At this time, at least a part of the anti-impregnation composition can be penetrated into the base layer and fill the porous structure inside the base layer. As a result, the anti-impregnation layer may have a structure partially overlapped with the substrate layer, and as a result, penetration of the encapsulated foaming agent into the substrate layer can be effectively prevented.

For example, since at least a part of the anti-impregnation layer overlaps with the base layer, impregnation prevention and prevention of a decrease in elongation can be prevented compared to a case where an additional layer is formed on the base layer without a portion where the anti- Can be implemented simultaneously.

In the case where an additional anti-impregnation layer is formed on the substrate layer, the movement of the substrate layer may be restrained by a separate anti-impregnation layer to reduce the elongation. However, as in the present invention, at least a part of the anti- In the case of superposition, an impregnation preventing layer is formed between the pores in the base layer, and even if the impregnation preventing layer is formed, the impregnation preventing effect can be effectively realized without deteriorating the elongation.

Referring to FIG. 1, at least a part of the anti-impregnation layer 120 may be overlapped with the substrate layer 110 in the skin material 100 for an automobile interior material according to an embodiment of the present invention. At least a part of the anti-impregnation layer overlaps with the base layer to improve the adhesion with the base layer, and the base layer may be exposed to the outside of the anti-impregnation layer.

The anti-impregnation layer may comprise a thermocompound of an anti-impregnation composition comprising a polycarbonate polyurethane resin, water, a sedative and a leveling agent.

The anti-impregnation composition, including the polycarbonate polyurethane resin, has excellent mutuality with the embossed composition, can secure excellent abrasion resistance and hydrolysis resistance, and is excellent in adhesion, so that the durability of the skin material for automobile interior materials can be improved And it is easy to prevent impregnation of the encapsulated foaming agent.

The automotive interior skin material includes a base layer. The base layer can maintain the proper elasticity and durability of the skin material for automobile interior materials and improve wear resistance.

The substrate layer may be a porous substrate. The thickness of the base layer occupies a large portion of the total thickness of the skin material for an automobile interior material. By utilizing the porous base material, the automobile interior material skin material can have excellent flexibility and impact absorption performance.

The skin material for the automobile interior material may have an elongation of about 8% to about 20%. It is possible to maintain the moldability and durability of the automobile interior material skin material by maintaining the elongation of the skin material in the above range and to secure the advantage that the workability is improved. If the elongation percentage of the skin material for automobile interior material is less than the above range, difficulty in processing may occur and post-treatment covering may not be easy. If the elongation of the skin material for automobile interior material exceeds the above range, the surface hardness and durability may be lowered, and the surface area may increase.

The substrate layer may include, but is not limited to, one selected from the group consisting of a nonwoven fabric, a fiber fabric, a polyester, and a combination thereof.

The substrate layer may have a thickness of from about 200 [mu] m to about 300 [mu] m. By maintaining the thickness of the base layer within the above range, excellent durability and moldability can be realized, and excellent elongation and suede feeling can be realized.

In another embodiment of the present invention, an anti-impregnation composition is applied to one surface of a substrate layer and a first thermal curing is performed to form an anti-impregnation layer; And applying an embossed composition to one surface of the anti-impregnation layer and then thermally curing the embossed composition to form an embossed layer.

The skin material for automobile interior material as described above can be manufactured through the method for manufacturing the skin material for automobile interior material. That is, referring to FIG. 1, a substrate layer 110, an anti-impregnation layer 120, and an emboss layer 130 are formed through the above manufacturing method. The emboss layer includes hemispherical embossed micro embosses on its surface, The surface roughness (Ra) of the embossed layer can be efficiently produced from about 40 탆 to about 70 탆. The above-mentioned skin materials for automobile interior materials and respective layers are as described above.

Specifically, the method for manufacturing a skin material for an automobile interior material is characterized in that the impregnation preventing layer and the emboss layer are formed in separate processes, thereby effectively preventing impregnation of the encapsulating foaming agent of the emboss layer. As a result, The surface roughness (Ra) of the embossed layer of the skin material for an automobile interior material can be easily realized in the above range. In addition, excellent abrasion resistance and suede texture can be realized.

The manufacturing method includes a step of applying an anti-impregnation composition on one surface of the substrate layer and then performing a primary thermosetting to form an anti-impregnation layer.

At this time, the application of the anti-impregnation composition may be performed by, for example, rotary screening printing or gravure coating, but is not limited thereto.

The anti-impregnation composition may be applied to one side of the substrate layer such that at least a portion of the anti-imfiltration composition seeps into the substrate layer and then thermally cured so that at least a portion of the substrate layer An anti-impregnation layer can be produced.

 Specifically, when the anti-impregnation composition is applied to one surface of the substrate layer, at least a part of the anti-impregnation composition may be impregnated into the substrate layer, The above-mentioned anti-impregnation layer which is cured by thermal curing and at least part of which is superimposed inside the substrate layer can be formed.

In addition, the method for manufacturing a skin material for automotive interior materials includes a step of applying an embossed composition to one surface of the anti-impregnation layer, and then thermally curing the embossed composition to form an embossed layer. The matters concerning the embossed composition are as described above.

At this time, the application of the embossed composition may be performed by, for example, rotary screening printing or gravure coating, but is not limited thereto.

As described above, the embossed composition may have a viscosity of about 350 cp to about 600 cp at about 25 ° C. When the embossed composition satisfies the above viscosity range, it is possible to improve the uniformity, the dispersibility and the adhesiveness with the impregnation preventing layer at the time of coating.

The secondary thermal curing is performed within a range that does not damage the anti-impregnation layer, and the anti-impregnation efficiency can be improved by making the anti-impregnation layer more rigid through secondary thermal curing.

Specifically, the hardening and compactness of the anti-impregnation film formed by performing the first-order thermal curing can be enhanced by further performing secondary thermal curing within a range that does not damage the anti-impregnation film, Impregnation of the foaming agent can be prevented.

The primary thermosetting may be performed by heat treating at about 80 ° C to about 130 ° C for about 50 seconds to about 60 seconds and the secondary thermosetting may be performed at about 160 ° C to about 180 ° C for about 3 minutes to about 4 minutes Lt; / RTI > By performing the primary thermosetting under the above conditions, excellent elasticity and hardness can be maintained, an effect of improving abrasion resistance can be ensured, and the secondary thermosetting can be performed under the above conditions, It is possible to realize excellent durability, elongation and brushed effect, and excellent abrasion resistance and scratch resistance can be ensured.

Hereinafter, specific embodiments of the present invention will be described. It is to be understood, however, that the embodiments described below are only for illustrative purposes or to illustrate the present invention, and the present invention should not be limited thereby.

<Production Example>

Manufacturing example  One: Impregnation  Preparation of preventive composition

Polycarbonate polyurethane resin (DKS460), water, sedative are mixed to prepare an anti-impregnation composition.

Manufacturing example  2: Embo  Composition manufacturing

55 parts by weight of the aforementioned polycarbonate polyurethane resin (DKS460), 5 parts by weight of a large number of encapsulated foaming agents having a particle diameter of 40 to 150 탆 after foaming, 5 parts by weight of a crosslinking agent (Bayer, imprafix 2794) Are mixed and water is added to prepare an embossed composition.

< Example  And Comparative Example >

Example  One

The anti-impregnation composition of Preparation Example 1 was applied to a porous nonwoven fabric having a thickness of 250 탆 and heat treated at 80 캜 for 1 minute to prepare an anti-impregnation layer. Subsequently, the embossed composition of Preparation Example 2 was coated on the anti-impregnation layer and heat treated at 165 ° C for 4 minutes to form an embossed layer. Thus, a skin material for automobile interior materials having a total thickness of 400 mu m was produced.

Comparative Example  One: Impregnation  Excluding the prevention layer

The embossed composition of Production Example 2 is coated on a porous nonwoven fabric having a thickness of 250 탆 and heat treated at 165 캜 for 4 minutes to produce a skin material for automobile interior material having a total thickness of 300 탆.

<Evaluation>

Experimental Example  One: Brushed  Judge Effect

The surface roughness (Ra) of the skin materials for automobile interior materials according to the above Examples and Comparative Examples was measured using a Mitsudo Yosha SJ 301 model. The results are shown in Table 1 below.

Experimental Example  2: Elongation  judgment

The skin materials for automobile interior materials according to the Examples and Comparative Examples were measured for elongation according to ASTM D638. The results are shown in Table 1 below.

Surface roughness (탆) Elongation (%) Example 1 55 20 Comparative Example 1 15 8

The skin material for automobile interior materials manufactured according to the embodiment realizes excellent surface roughness and elongation characteristics. Specifically, it can be confirmed that the skin material for automobile interior material manufactured according to Example 1 exhibits an excellent elongation at 20% and an excellent suede texture with a surface roughness exceeding 50 탆.

2 and 3, it can be seen that the skin material for automobile interior material shown in FIG. 2 has a great difference in surface roughness, and a superior suede texture is realized. Specifically, the excellent suede texture is shown in FIG. 3 It can be confirmed that the present invention is embodied by a capsule-type foaming agent which is foamed in a sufficient size.

On the other hand, the skin material for automobile interior materials manufactured according to Comparative Example 1 has a surface roughness of only 15 탆 and a elongation of only 8%, so that the suede texture is remarkably lowered as compared with Example 1, and moldability and durability There is concern that it may weaken.

4, the skin material for automobile interior materials shown in Fig. 4 does not have the impregnation preventing layer, and when the capsule type foaming agent is impregnated and compared with Fig. 3, it is difficult to confirm the capsule type foaming agent foamed on the surface to a sufficient size As a result, it can be confirmed that the effect of realizing the suede texture is weakened because the surface roughness is low.

100: Skin material for automobile interior material
110: substrate layer
120: Impregnation prevention layer
130: emboss layer

Claims (20)

A base layer, an anti-impregnation layer and an emboss layer
The embossed layer includes hemispherical embossed fine embosses on its surface
The surface roughness (Ra) of the emboss layer is 30 탆 to 70 탆,
Wherein at least a part of the anti-impregnation layer overlaps with the substrate layer
Skin materials for automobile interior materials.
delete delete The method according to claim 1,
The embossing layer comprises a thermoset material of an embossing composition comprising a polycarbonate polyurethane resin, water, a crosslinking agent and a capsule-like foaming agent
Skin materials for automobile interior materials.
delete delete 5. The method of claim 4,
Wherein the embossed composition contains 3 to 5 parts by weight of the encapsulated foaming agent based on 100 parts by weight of solid content
Skin materials for automobile interior materials.
delete 5. The method of claim 4,
The polycarbonate polyurethane resin has a glass transition temperature of -20 캜 to 10 캜
Skin materials for automobile interior materials.
5. The method of claim 4,
The capsule-type foaming agent has a particle diameter of 40 mu m to 150 mu m after foaming
Skin materials for automobile interior materials.
5. The method of claim 4,
The capsule-type foaming agent has a core-shell structure,
Wherein the core of the capsular foaming agent comprises one selected from the group consisting of isobutane, n-butane, n-pentane, isopentane, n-hexane, petroleum ether,
Wherein the shell of the capsular foaming agent comprises one selected from the group consisting of low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer, vinyl chloride, ethylene-methyl methacrylate copolymer,
Skin materials for automobile interior materials.
5. The method of claim 4,
The maximum foaming temperature of the capsular foaming agent is preferably from 160 캜 to 180 캜
Skin materials for automobile interior materials.
delete 5. The method of claim 4,
Wherein the embossed composition has a viscosity at 25 DEG C of from 350 cp to 600 cp
Skin materials for automobile interior materials.
The method according to claim 1,
Wherein the emboss layer has a thickness of 100 mu m to 150 mu m
Skin materials for automobile interior materials.
The method according to claim 1,
The anti-impregnation layer comprises a thermoset composition of an anti-wear composition comprising a polycarbonate polyurethane resin, water, a sedative and a leveling agent
Skin materials for automobile interior materials.
The method according to claim 1,
Wherein the substrate layer comprises one selected from the group consisting of a nonwoven fabric, a textile fabric, a polyester, and combinations thereof
Skin materials for automobile interior materials.
Applying an anti-impregnation composition on one side of the substrate layer and firstly thermally curing to form an anti-impregnation layer; And
Applying an embossing composition to one surface of the anti-impregnation layer and forming an emboss layer by secondary thermosetting,
The anti-impregnation composition is applied to one side of the substrate layer,
At least a part of the anti-impregnation composition is impregnated into the base layer and thermally cured to form the anti-impregnation layer
A method for manufacturing a skin material for automobile interior materials.
delete 19. The method of claim 18,
The primary thermosetting is carried out by heat treating at 80 ° C to 130 ° C for 50 seconds to 60 seconds,
The secondary thermosetting is performed by heat-treating at 160 ° C to 180 ° C for 3 minutes to 4 minutes
A method for manufacturing a skin material for automobile interior materials.

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