WO2019143200A1 - Thermoplastic polyurethane composition for powder slush molding, preparation method therefor, and automotive interior skin material manufactured using same - Google Patents

Abstract

The present invention relates to a thermoplastic polyurethane composition for powder slush molding, a preparation method therefor, and an automotive interior skin material manufactured using the same and, more specifically, to: a thermoplastic polyurethane composition for powder slush molding, wherein the thermoplastic polyurethane composition is for manufacturing an automotive interior skin material by a powder slush molding process and has excellent formability while an automotive interior skin material, formed by using the same, has excellent scratch resistance, tensile strength, elongation at break, gloss variation, weather resistance and tactile sensation; a preparation method therefor; and an automotive interior skin material manufactured using the same.

Description

A thermoplastic polyurethane composition for powder slush molding, a process for producing the same, and a skin material for automobile interior materials manufactured using the same

The present invention relates to a thermoplastic polyurethane composition for powder slush molding, a method for producing the same, and a skin material for an automobile interior material manufactured using the same, and more particularly, to a skin material for an automobile interior material by a powder slush molding method The thermoplastic polyurethane composition is excellent in moldability, and the skin material for an automobile interior material formed using the thermoplastic polyurethane composition is excellent in scratch resistance, tensile strength, elongation at break, gloss change rate, weatherability, The present invention relates to a thermoplastic polyurethane composition for slush molding, a method for producing the same, and a skin material for automobile interior materials manufactured using the same.

Thermoplastic polyurethane (TPU) resin, which is widely used as an automobile interior material, can be molded in various forms in comparison with price and has good mechanical properties and is particularly suitable for instrument panel, door trim Door trims), automotive interior mat backing materials, and the like.

On the other hand, the skin material for automobile interior materials manufactured from the composition including the TPU resin is manufactured by a powder slush molding method having a high degree of design freedom and excellent emboss pattern retention as disclosed in Korean Patent Registration No. 10-1775199 , The TPU resin has a higher tackiness than other thermoplastic elastomers, and scratches are generated by the hands of the operator when the skin material is demolded from the mold after molding.

In addition, since the scratch resistance of the TPU material is not good due to its inherent characteristics, it is not easy to satisfy the hardness or scratch resistance according to the level of the end user.

Conventionally, in order to solve this problem, silicone oil, paraffin oil or paraffin wax is added to the composition to reduce stickiness between the mold and the resin to facilitate demoulding and to improve the scratch resistance. In this case, The oil or wax having a small molecular weight is excessively transferred to the surface of the skin material to increase the gloss and the oil or wax transferred to the surface is volatilized and the scratch resistance can not be maintained. There is a problem that scratches are generated by the user of the final product applied.

Accordingly, the skin material formed using the TPU resin composition is excellent in moldability, and the thermoplastic polyurethane composition for powder slush molding is excellent in scratch resistance, tensile strength, elongation at break, weather resistance, And to develop a skin material for automobile interior materials manufactured using the same.

[Prior art document]

[Patent Literature] (Patent Document 1) KR 10-1775199 B (Notification: 2017.08.30)

In order to solve the problems of the prior art as described above, the present invention relates to a thermoplastic polyurethane composition for powder slush molding, which is excellent in moldability, and a skin material for automobile interior materials manufactured using the same has low gloss change rate, scratch resistance, Which is excellent in elongation at break, weather resistance, and feel, and a method for producing the same, and a skin material for automobile interior materials manufactured using the same.

In order to achieve the above object,

The present invention relates to a thermoplastic resin composition comprising 100 parts by weight of a thermoplastic polyurethane resin; And

25 to 70 parts by weight of a thermoplastic silicone vulcanizate.

The present invention also relates to a thermoplastic silicone vulcanate production step (S1) for producing thermoplastic silicone vulcanizate (B);

(S3) mixing 25-70 parts by weight of the thermoplastic silicone vulcanizate (B) in the step (S1) with 100 parts by weight of the thermoplastic polyurethane resin (A). ≪ / RTI >

The present invention also relates to a skin material for an automobile interior material manufactured using the thermoplastic polyurethane composition for powder slush molding.

The thermoplastic polyurethane composition for powder slush molding of the present invention has an excellent moldability.

Further, the skin material for automobile interior materials manufactured using the thermoplastic polyurethane composition for powder slush molding of the present invention has an excellent scratch resistance, tensile strength, elongation at break, gloss change rate, weather resistance, and touch.

Hereinafter, the thermoplastic polyurethane composition for powder slush molding of the present invention will be described in detail.

The present inventors have found that a thermoplastic polyurethane composition for powder slush molding is excellent in moldability, and a skin material for an automobile interior material manufactured using the same has a small rate of change in gloss, and is excellent in scratch resistance, tensile strength, elongation at break, As a result of the efforts, it was confirmed that the above effect can be realized when the thermoplastic silicone vulcanizate is used within a certain amount range.

Based on these results, the inventors of the present invention have made further studies and have completed the present invention.

The present invention relates to a thermoplastic resin composition comprising 100 parts by weight of a thermoplastic polyurethane resin; And

25 to 70 parts by weight of a thermoplastic silicone vulcanizate.

In the present invention, the powder slush molding is performed by loading a thermoplastic polyurethane composition in the form of powder into an open container, combining the heated mold with the open container to form a closed system and rotating the mold, Means a method of producing a skin material for an automobile interior material by melting and applying the thermoplastic polyurethane composition.

Hereinafter, each component contained in the thermoplastic polyurethane composition for powder slush molding will be described in detail.

Thermoplastic polyurethane resin (A)

The "thermoplastic polyurethane resin" of the present invention has an ability to stretch beyond its original length and to shrink substantially to its original length when relaxed. Specifically, it is softened upon exposure to heat and substantially returned to its original state when cooled to room temperature Means the polyurethane coming from.

The thermoplastic polyurethane resin (A) of the present invention may be an aliphatic thermoplastic polyurethane resin excellent in weather resistance without discoloration and aging due to ultraviolet rays.

Specifically, the thermoplastic polyurethane resin (A) can be produced by reacting an aliphatic diisocyanate with a polyol and a chain extender.

Examples of the aliphatic diisocyanate include isophorone diisocyanate, 1,6 hexamethylene diisocyanate, 4,4-dicyclomethane diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 1,4-cyclohexyl Diisocyanate, decane-1,10-diisocyanate, and dicyclohexylmethane-4,4'-diisocyanate.

The polyol may be at least one selected from the group consisting of a polyether polyol, a polyester polyol and a polycarbonate polyol.

The polyether polyol is a diol or a polyol having 2-15 carbon atoms, specifically, an alkyldiol or a glycol and an alkylene oxide having 2-6 carbon atoms, specifically, ethylene oxide or propylene oxide Lt; / RTI >

The polyester polyol may be formed by esterifying one or more glycols with one or more dicarboxylic acids or anhydrides thereof. As a specific example, the glycol may be at least one selected from ethylene glycol, propylene glycol and glycerin, and the dicarboxylic acid may be at least one selected from adipic acid, phthalic acid and maleic acid.

Alternatively, the polyester polyol may be formed by subjecting a lactone or a derivative thereof to ring-opening polymerization using a small amount of a diol, a triol or an amine as an initiator.

As a specific example, the polyester polyol may be polycaprolactone (PCL) synthesized by ring-opening polymerization using ε-caprolactone (CL) with diethylene glycol as an initiator.

The polycarbonate polyol may be derived from the reaction of a glycol and a carbonate.

The chain extender may be, for example, an aliphatic linear and branched chain diol having 2 to 10 carbon atoms in the chain, and specific examples include ethylene glycol, 1,3-propanediol, 1,4-butanediol, Hexanediol, cyclohexanediol, cyclohexanediol, diethylene glycol, dipropylene glycol monomethyl ether, cyclohexanedimethanol, cyclohexanediol, cyclohexanediol, cyclohexanediol, cyclohexanediol, Glycol, ethanolamine, and N-methyldiethanolamine.

The thermoplastic polyurethane resin (A) of the present invention may be at least one selected from the group consisting of a polyether-based polyurethane or a polycaprolactone-based polyurethane, and more specifically, a polyol having a hydrolyzable and heat- Caprolactone-based polyurethane.

The thermoplastic polyurethane resin (A) may have a particle size of 100-600 占 퐉 or 200-400 占 퐉. If the amount is less than the above range, the dropping property of the thermoplastic polyurethane composition may be lowered, which may result in difficulty in the powder slush molding process. If the above range is exceeded, the thermoplastic polyurethane resin melts less at a molding temperature of 200-250 ° C Which may cause problems in moldability and may have a particle size within the above range.

The particle size can be inferred through particle size distribution analysis (dry or wet) using a sieve vibrator from FRITSCH.

The thermoplastic polyurethane resin (A) may have a Shore A hardness of 65-92 or 70-90. If it is less than the above range, the scratch resistance may be deteriorated. If it exceeds the above range, the soft touch feeling may be lowered as a skin material for automobile interior materials, and Shore A hardness within the above range can be obtained.

The Shore A hardness can be measured according to ISO 868.

The thermoplastic polyurethane resin (A) may have a tensile strength of 5-35 MPa or 10-30 MPa. If it is less than the above range, the tensile strength and elongation at break, which are required as the skin material for automobile interior materials, may not be satisfied, and if it exceeds the above range, the air bag may not be torn along the incision line during deployment, It can have strength.

The tensile strength can be measured according to ISO 527-2.

The thermoplastic polyurethane resin (A) may have a elongation at break of 300-520% or 350-480%. If it is less than the above range, the tensile strength and the elongation at break, which are required as the skin material for automobile interior materials, may not be satisfied. If it exceeds the above range, the air bag may not be torn along the incision line during deployment, It can be stretched.

The elongation at break can be measured in accordance with ISO 527-2.

The thermoplastic polyurethane resin (A) may have a Vicat softening point of 40-60 ° C or 45-55 ° C. If the temperature of the automobile is lower than the above range, the appearance of the automobile interior temperature may be changed and cracks may occur. If the temperature is above the above range, the skin softness may be deteriorated under low temperature conditions, have.

The Vicat softening point of the present invention can be measured according to ISO 306.

The melt flow index (MFI) of the thermoplastic polyurethane resin (A) may be 50-100 g / 10 min (185 ° C, 2.16 kg) or 60-85 g / 10 min (185 ° C, 2.16 kg) . If it is outside the above range, the processability may be deteriorated and the melt flow index within the above range may be obtained.

The thermoplastic silicone vulcanates (B)

The thermoplastic polyurethane composition of the present invention may include a thermoplastic silicone vulcanizate which is a thermoplastic elastomer in order to improve the scratch resistance of the skin material for an automobile interior material and impart soft touch and weatherability.

The thermoplastic silicone vulcanizate (B) may be in the form of a crosslinked silicone rubber (B-2) dispersed in a thermoplastic polymer matrix (B-1).

Wherein the thermoplastic polymer matrix (B-1) is at least one of polyamide, polypropylene, polyethylene, polyvinyl chloride, polyurethane, polyester, polycarbonate, Polysulfone, and polysulfone.

In one embodiment of the present invention, the thermoplastic polyurethane resin (A) is excellent in compatibility with the thermoplastic polyurethane resin (A), and the thermoplastic polymer matrix (B-1) Urethane resin can be used.

The same thermoplastic polyurethane resin as the thermoplastic polyurethane resin (A) described above is used, and redundant description thereof is omitted.

The cross-linked silicone rubber (B-2) means that it is cured, vulcanized and / or catalyzed, and has excellent mechanical properties such as strength, elasticity or heat resistance as compared with the silicone rubber (C) It is possible to impart an improved scratch resistance and weather resistance to a skin material for an automobile interior material.

In the present invention, the crosslinked silicone rubber (B-2) means a fully-crosslinked silicone rubber.

The weight ratio of the thermoplastic polymer matrix (B-1) to the crosslinked silicone rubber (B-2) may be 90: 10-50: 50 or 85: 15-55: 45. When the amount of the crosslinked silicone rubber (B-2) is less than the above range, the effect of improving the scratch resistance of the skin material for automobile interior materials may be insignificant, and the tactile feeling and weather resistance may be deteriorated. The dispersibility of the rubber (B-2) is lowered and the composition is poorly melted during the powder slush molding process, resulting in deterioration of the mechanical properties such as tensile strength and elongation at break of the skin material, B-2), the tactile sensation of the skin material may be deteriorated and may be included within the above range.

The thermoplastic silicone vulcanizate (B) may have a Shore A hardness of 30-80 or 40-77. If the amount is less than the above range, the effect of improving the scratch resistance may be insignificant. If the above range is exceeded, the feeling of soft feeling may be lowered as the skin material for automobile interior materials.

The Shore A hardness can be measured according to ISO 868.

The thermoplastic silicone vulcanates (B) may have a tensile strength at break of 3-35 MPa, 4-30 MPa, or 4-20 MPa, and the elongation at break may be 600-750%, 610-740%, or 620-730% have. If it is less than the above range, the effect of improving the scratch resistance may be insignificant. If it exceeds the above range, the air bag may not be torn along the incision line when the air bag is deployed, so that the tensile strength and the elongation at break may be within the above range.

The tensile strength and elongation at break can be measured in accordance with ISO 37.

The thermoplastic silicone vulcanizate (B) may have a melt flow index (MFI) of 40-100 g / 10 min (190 ° C, 10 kg) or 45-95 g / 10 min (190 ° C, 10 kg). When the amount is less than the above range, the composition may not flow well after melting, and the moldability may be deteriorated. If it exceeds the above range, the composition may not be maintained as a skin material after melting and flow down, .

The melt flow index can be measured in accordance with ISO 1133.

The thermoplastic silicone vulcanizate (B) may be contained in an amount of 25-70 parts by weight or 30-60 parts by weight based on 100 parts by weight of the thermoplastic polyurethane resin (A). When the amount is less than the above range, the slip property of the skin material for automobile interior materials is lowered and the effect of improving the de-moldability and improving the scratch resistance is small, and the tactile and weather resistance is decreased. The dispersibility of the crosslinked silicone rubber (B-2) is lowered and the composition is poorly melted during the powder slush molding process, resulting in deterioration of the moldability. As a result, mechanical properties such as tensile strength and elongation at break of the skin material deteriorate, -2), the tactile sensation of the skin material may be deteriorated and may be included within the above range.

The thermoplastic polyurethane composition for powder slush molding of the present invention may optionally contain at least one additive selected from a flame retardant, a light stabilizer, a high heat stabilizer, a lubricant, an antioxidant, a heat resistant agent, an antistatic agent, an antibacterial agent, As shown in FIG.

The kind and content of the additive are not limited as long as the effect of the present invention is not impaired.

The thermoplastic polyurethane composition for powder slush molding of the present invention may be in the form of a powder and the thermoplastic polyurethane composition in powder form may have an average particle size of 150-250 占 퐉 or 170-200 占 퐉, The moldability can be excellent in the powder slush molding.

The average particle size can be measured using a mesh.

In addition, the dropping property of the powdery thermoplastic polyurethane composition is 10-15 seconds or 12-13 seconds, and the dropping property is within the above range, so that the moldability in powder slush molding can be excellent.

The castability can be measured by taking 100 ml of the powdery thermoplastic polyurethane composition into an apparent specific gravity measuring device funnel according to KS M 3002 and taking 100 ml of powder to fully escape from the funnel.

Hereinafter, a method for producing a thermoplastic polyurethane composition for powder-slush molding of the present invention will be described.

Specifically, the present invention relates to a thermoplastic silicone vulcanate manufacturing step (S1) for producing thermoplastic silicone vulcanizate (B);

(S3) mixing 25-70 parts by weight of the thermoplastic silicone vulcanizate (B) in the step (S1) with 100 parts by weight of the thermoplastic polyurethane resin (A). ≪ / RTI >

Hereinafter, each step will be described in more detail.

The thermoplastic silicon vulcanate production step (S1)

The step (S1) is a step of mixing and dynamically vulcanizing a thermoplastic polymer, a silicone rubber (C), a curing agent and a catalyst so as to obtain a thermoplastic elastomer in the form of a silicone rubber (B-2) crosslinked in the thermoplastic polymer matrix (B- To produce a thermoplastic silicone vulcanizate (B).

In the present invention, the dynamic vulcanization process is a process in which a vulcanization process is carried out under the conditions of a high shear flow (for example, 150-300 rpm) and a high temperature (for example, 160-200 deg. C) Means a vulcanization process in which a polymer and at least one vulcanizable rubber are mixed. This dynamic vulcanization step can be carried out simultaneously with mixing in an extruder as an example.

The thermoplastic polymer may be present as a continuous matrix through the dynamic vulcanization step and the silicone rubber (C) may be crosslinked (that is, crosslinked silicone rubber (B-2)) as particles in the matrix.

The properties of the thermoplastic polymer are the same as those described above, and it is particularly preferable to use the thermoplastic polyurethane resin (A) as the thermoplastic polymer for excellent compatibility with the thermoplastic polyurethane resin (A) described later.

The silicone rubber (C) may be prepared from an organopolysiloxane or by mixing a filler with an organopolysiloxane.

The organopolysiloxane may be a high consistency homopolymer or copolymer of di-organopolysiloxane gum (gum) containing two or more alkenyl groups of 2-20 carbon atoms in the molecule. The alkenyl group having 2-20 carbon atoms may be, for example, at least one member selected from the group consisting of vinyl, allyl, butenyl, pentenyl, hexenyl, propenyl and decenyl. The position of the alkenyl group is not critical, and it can be bonded at the molecular chain end, at the non-terminal position of the molecular chain, or at both of the above positions. In one embodiment, the alkenyl group is vinyl or hexenyl, and these groups may be included in the organopolysiloxane in an amount of 0.001-3 wt%, or 0.01-1 wt%.

The remaining (i.e., non-alkenyl) organic groups bonded to the silicon of the organopolysiloxane are independently selected from hydrocarbons or halogenated hydrocarbons that do not contain aliphatic unsaturation. Specifically, they may be an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group, an aryl group having 6 to 12 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, or a halogenated alkyl group having 1 to 20 carbon atoms.

The alkyl group having 1-20 carbon atoms includes, for example, methyl, ethyl, propyl, butyl, pentyl, and hexyl; The cycloalkyl group can be exemplified by, for example, cyclohexyl and cycloheptyl.

Examples of the aryl group having 6-12 carbon atoms include phenyl, tolyl and xylyl.

The aralkyl group having 7 to 20 carbon atoms may be, for example, benzyl and phenethyl.

Examples of the halogenated alkyl group having 1-20 carbon atoms include, for example, 3,3,3-trifluoropropyl and chloromethyl.

The viscosity of the organopolysiloxane at 25 占 폚 is not less than 100 mPa 占 퐏, for example not less than 300 mPa 占 퐏, not more than 90000 mPa 占 퐏, or not more than 70000 mPa 占 퐏.

The filler is a finely divided filler known to enhance the organopolysiloxane and is, for example, selected from the group consisting of fumed silica, precipitated silica, silica aerosol and titanium dioxide having a specific surface area of at least 50 m ² / g Fumed silica may be used as a specific example.

The filler may be used in an amount of 5-150 parts by weight or 20-100 parts by weight based on 100 parts by weight of the organopolysiloxane.

The curing agent for crosslinking the silicone rubber (C) may be an organopolysiloxane containing two or more hydrogen atoms bonded to silicon (Si) in a molecule, and the content thereof is preferably 0.2-2 wt% Or 0.5-1.7 wt%.

In addition, the curing agent may have a viscosity at 25 ° C of 0.5-1000 mPa · s or 2-500 mPa · s or 5-150 mPa · s.

The molar ratio of silicon-bonded hydrogen atoms of the curing agent to the silicon-bonded alkenyl of the organopolysiloxane may be 1 or more and less than 50, and may be 3 to 30 in one embodiment.

The catalyst may be a catalyst for accelerating the crosslinking of the silicone rubber (C). In one embodiment, a hydrosilylation catalyst may be used. Examples of the hydrosilylation catalyst include platinum black, platinum supported on silica, carbon Platinum catalysts such as platinum, chloroplatinic acid, an alcohol solution of chloroplatinic acid, platinum / olefin complexes, platinum / alkenylsiloxane complexes, platinum / beta-diketone complexes, platinum / phosphine complexes and the like, rhodium chloride and rhodium chloride / Di (n-butyl) sulfide complexes and the like, and palladium catalysts such as palladium on carbon, palladium chloride and the like.

The thermoplastic polymer and the silicone rubber (C) may be mixed in a weight ratio of 90-50: 10-50 or 85-55: 15-45, and when the content of the silicone rubber is less than the above range, If the amount exceeds the above range, the dispersibility of the silicone rubber (C) in the composition is lowered and the moldability of the composition is lowered. As a result, mechanical properties such as tensile strength and elongation at break of the finished skin material , So that they can be mixed at a weight ratio within the above range.

The curing agent may be added in an amount of 0.5-10 parts by weight or 1-5 parts by weight based on 100 parts by weight of the total amount of the thermoplastic polymer and the silicone rubber (C) Within the above range, the crosslinking of the silicone rubber is excellent, so that the skin material for automobile interior materials can be provided with improved scratch resistance, weather resistance and touch.

The catalyst may be contained in an amount of 0.05-10 parts by weight or 0.1-5 parts by weight based on 100 parts by weight of the total amount of the thermoplastic polymer and the silicone rubber (C), and the crosslinking of the silicone rubber can be promoted within the above range The production efficiency is excellent.

The mixing of step (S1) may be performed at a temperature of 160-200 占 폚 or 170-190 占 폚. When the mixing is carried out at a temperature lower than the above-mentioned temperature range, the thermoplastic polymer and the silicone rubber (C) are not sufficiently melted and the dispersibility of the silicone rubber (C) in the thermoplastic polymer is lowered, Mechanical properties such as tensile strength and elongation at break of the finished skin material may be deteriorated. If the temperature range is exceeded, the thermoplastic polymer is thermally decomposed to deteriorate physical properties such as tensile strength and elongation at break of the finished skin material. . ≪ / RTI >

Optionally, the step (S1) may be carried out using a coupling agent, a softening mineral oil, a plasticizer, other mineral fillers, pigments, dyes, viscosity modifiers, stabilizers, lubricants and flexibilizers ), And the kind and content of the additive is not limited.

The present inventors have found that when a small amount of silicone rubber (C) is added during the production of the thermoplastic polyurethane composition for powder slush molding, the dispersibility of the silicone rubber (C) is lowered and the physical properties of the skin material formed using the silicone rubber (Step S1) of master batching the thermoplastic polymer (that is, the polyurethane resin) and the high-content silicone rubber (C) in advance as described above, The dispersibility of the composition (C) was improved, and the moldability of the composition was excellent, and the excellent physical properties of the skin material formed using the composition could be realized.

In order to improve the dispersibility of the additive in the polymer material, the master batch is prepared by first mixing a polymer material and a high-concentration additive in the form of a chip or a pellet when adding an additive to add functionality to a polymer material such as plastic And then adding it to the polymer material to use it.

In the mixing step (S3)

The step (S3) may be a step of mixing 25 to 70 parts by weight or 30 to 60 parts by weight of the thermoplastic silicone vulcanizate (B) in the step (S1) with respect to 100 parts by weight of the thermoplastic polyurethane resin (A).

In step (S3), the thermoplastic polyurethane resin (A) and the thermoplastic silicon vulcanizate (B) are placed in a Banbury mixer and heated at 150-170 ° C or 155-165 ° C for 3-10 minutes or 5 -7 minutes. At this time, the mixture of step (S3) may be heated to about 170-180 DEG C due to frictional heat.

The mixture of step (S3) may optionally contain at least one additive selected from a flame retardant, a light stabilizer, a high heat stabilizer, a lubricant, an antioxidant, a heat resistant agent, an antistatic agent, an antimicrobial agent, a processing aid, a metal deactivator, And the kind and content thereof are not limited unless they impair the desired effects of the present invention.

The method for producing a thermoplastic polyurethane composition for powder slush molding according to the present invention may further comprise: a pellet preparation step (S5) of producing a mixture of the mixing step (S3) as a pellet; And a powder preparation step (S7) of pulverizing the pellet to produce a powder; As shown in FIG.

The pellet preparation step (S5) may be a step of putting the mixture of step (S3) into an extruder and extruding the mixture at 160-190 ° C or 170-185 ° C to form pellets.

If the temperature is less than the above range, the mixture of step (S3) is not sufficiently melted, and the mechanical properties such as tensile strength and elongation at break of the finished skin material deteriorate. When the temperature exceeds the temperature range, the thermoplastic polyurethane resin (A ) Is thermally decomposed to deteriorate physical properties such as tensile strength and elongation at break of the finished skin material.

The powder manufacturing step (S7) is a step of preparing the powdery thermoplastic polyurethane composition by freezing the pellet produced in the step (S5) and pulverizing the granulated product using the liquid nitrogen or by hydro-grinding .

The thermoplastic polyurethane composition in the powder form may have an average particle size of 150-250 占 퐉 or 170-200 占 퐉, and the flowability may be 10-15 seconds or 12-13 seconds.

The thermoplastic polyurethane composition of the present invention in powder form prepared from the above-described method for producing a thermoplastic polyurethane composition for powder slush molding has an excellent dispersibility of silicone rubber in the composition and is excellent in powder-slush molding and moldability.

The present invention also relates to a skin material for an automobile interior material formed using the thermoplastic polyurethane composition for powder slush molding.

Specifically, the skin material for an automobile interior material of the present invention can be manufactured through a powder slush molding process using the composition described above.

The powder slush molding process may be performed at a temperature of about 200-250 ° C, 210-250 ° C, or 220-240 ° C, in which case the skin moldability may be excellent.

The automobile interior material may be an instrument panel, a door trim, a console box, an armrest, a headrest, a pillar trim, a seat buckle, a headliner, a glove box, a trunk cover trim, an airbag cover or a steering wheel cover.

The skin material for an automobile interior material of the present invention comprises 50-84% by weight or 55-80% by weight of the thermoplastic polyurethane resin (A), 16-40% by weight or 18-38% by weight of the thermoplastic silicone vulcanizate (B) By weight, and is excellent in mechanical properties as well as excellent scratch resistance, touch, and weather resistance as a skin material for automobile interior materials.

In one embodiment, when the thermoplastic polymer matrix (B-1) in the thermoplastic silicone vulcanizate (B) is the same as the thermoplastic polyurethane resin (A), the skin material is a thermoplastic polyurethane resin (A + , 82-90% by weight or 85-88% by weight of silicone rubber (C), 6.3-15% by weight, 6.4-14% by weight or 7-10% by weight of silicone rubber (C) As a skin material, it has excellent mechanical properties and excellent dispersibility of the silicone rubber (C) in the composition, and has excellent properties such as scratch resistance, tensile strength and elongation at break of the skin material.

Further, the skin material for automobile interior material of the present invention has an scratch resistance (JIS K 6718, g) of 300 g or more or 400 g or more, and has excellent scratch resistance in the above range. The upper limit thereof is not limited, but may be, for example, 1500 g or less or 1300 g or less.

The surface scratch resistance was evaluated by scratching the surface of the surface of the skin with a Heidon scratch tester (SHINTO Co., HEIDON type 14FW) under a load of 100 mm / s at a speed of 100 mm / s in accordance with JIS K 6718, It is possible to measure the load when it exceeds 200 mu m.

In addition, the skin material for automobile interior materials of the present invention may have a tensile strength (ISO 5207-3) of 85-150 MPa, 90-140 MPa or 90-120 MPa, and is advantageous in expanding the airbag with excellent mechanical properties within the above range .

The tensile strength may be measured using a universal testing machine (UTM) according to ISO 5207-3.

In addition, the skin material for automobile interior materials of the present invention may have a breaking elongation (ISO 5207-3) of 350-500%, 350-450%, or 400-450% There is an advantageous effect of expanding the airbag even though the mechanical properties are excellent within the above range.

The elongation at break may be measured using a universal testing machine (UTM) according to ISO 5207-3.

In addition, the skin material for an automobile interior material of the present invention may have a gloss change rate of -40% to + 40%, -20% to + 20%, or -7% to + 7% It is possible to satisfy the required gloss change rate.

The gloss change rate was measured by using a gloss meter (BYK Gardner GLOSS master 60) after irradiating ultraviolet ray (Xenon arc defined in ISO 105) in an amount of 126 MJ to a skin sample at an incident angle of 60 degrees according to ASTM D563, The glossiness before and after the ultraviolet irradiation can be measured and the rate of change thereof can be calculated.

The skin material for automobile interior material of the present invention may have weatherability of -30% to + 30%, -25% to + 25% or -20% to + 20% It is possible to satisfactorily satisfy the weatherability.

The weathering resistance was measured by irradiating ultraviolet ray (UV, Xenon arc specified in ISO 105) in the amount of 126 MJ to the skin sample and measuring tensile strength and / or elongation before and after aging using a universal testing machine (UTM) The rate of change can be calculated.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention. Such variations and modifications are intended to be within the scope of the appended claims.

[ Example ]

1. Production of skin material for automobile interior material using polyvinyl chloride composition for powder slush molding

(1) Powder Slush  Preparation of thermoplastic polyurethane composition for molding

Using the composition shown in the following Table 1, a thermoplastic polyurethane composition for powder-type powder-slush molding having an average particle size of 150-250 占 퐉 and a flowability of 10-15 seconds was prepared.

The concrete production method thereof will be described separately in the item '(2) Method for producing polyvinyl chloride composition for powder slush molding' below.

Classification (parts by weight)	Example 1	Example 2	Example 3	Example 4	Comparative Example 1	Comparative Example 2	Reference Example 1	Reference Example 2	Reference Example 3	Reference Example 4
Thermoplastic polyurethane resin	100	100	100	100	100	100	100	100	100	100
Thermoplastic Silicon Vulcanide 1	30	50	-	-	-	-	20	80	-	-
Thermoplastic Silicon Vulcanide 2	-	-	30	50	-	-	-	-	20	80
Thermoplastic vulcanizate	-	-	-	-	-	30	-	-	-	-
Paraffin oil	-	-	-	-	5	-	-	-	-	-
High heat stabilizer	6	6	6	6	6	6	6	6	6	6
Light stabilizer	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3

- (A) Thermoplastic polyurethane resin: particle size of 200 占 퐉, Shore A hardness (ISO 868) of 88, tensile strength (ISO 527-2) of 26 MPa, elongation at break (ISO 527-2) of 415% (ISO 306) of 48 占 폚 and a melt flow index (MFI) of 70 g / 10 min (185 占 폚, 2.16 kg)

- (B) Thermoplastic Silicon Vulcanide 1: A thermoplastic silicone vulcanizate in which 30% by weight of a crosslinked silicone rubber (B-2) is dispersed in 70% by weight of a thermoplastic polyurethane polymer matrix (B-1) (ISO 868) of 75, a tensile strength (ISO 37) of 12.1 MPa, a elongation at break (ISO 37) of 630% and a melt flow index (ISO 1133) of 60 g / 10 min

- Thermoplastic Silicon Vulcanide 2: Thermoplastic silicone vulcanizate in which 40% by weight of a crosslinked silicone rubber (B-2) is dispersed in 60% by weight of a thermoplastic polyurethane polymer matrix (B-1) (ISO 868) of 48, a tensile strength (ISO 37) of 4.4 Mpa, a elongation at break (ISO 37) of 710% and a melt flow index (ISO 1133) of 55 g / 10 min

Thermoplastic vulcanizate: a thermoplastic vulcanizate in which crosslinked EPDM rubber is dispersed in a thermoplastic polypropylene polymer matrix having a Shore A hardness (ISO 868) of 70, a tensile strength (ASTM D412) of 6.20 MPa, a elongation at break Thermoplastic vulcanizate (ExxonMobil, Santoprene ^TM 121-70M350) with a melt flow index (ISO 1133) of 5-10 g / 10 min (190 ° C, 10 kg).

Paraffin oil: Paraffin oil having a weight average molecular weight of 400 g / mol (Kukdong Yufu Co., LP500).

- High heat stabilizer (Irganox 1010, AASF)

- light stabilizer (Tinuvin PUR 866, AASF)

(2) Method for producing thermoplastic polyurethane composition for powder slush molding

The thermoplastic polyurethane compositions used in Examples 1 to 4, Comparative Examples 1 and 2, and Reference Examples 1 to 4 were prepared by the following production methods.

Separately, Reference Examples 5 and 6 for confirming the physical properties of the skin material according to the silicone rubber content in the thermoplastic silicone vulcanizate, the thermoplastic polyurethane resin and silicone (polyvinylpyrrolidone) in the mixing step (S3) Reference Example 7 for confirming the physical properties of the skin material and a thermoplastic polyurethane composition of Reference Example 8 for confirming the physical properties of the skin material when using non-crosslinked silicone gum other than thermoplastic silicon vulcanizate were further prepared .

≪ Example 1 >

end. The thermoplastic silicon vulcanate production step (S1)

Thermoplastic polyurethane resin 70 parts by weight Silicone rubber 30 parts by weight, curing agent 2.5 parts by weight and catalyst 0.1 part by weight were fed into a twin-screw extruder (BAUTEK, BA-19) to perform dynamic vulcanization and mixing at a temperature of 150-300 rpm, To prepare thermoplastic silicone vulcanizate 1.

I. In the mixing step (S3)

Subsequently, 30 parts by weight of the thermoplastic silicone vulcanizate 1, 6 parts by weight of the high heat-resistant stabilizer and 0.3 part by weight of the light stabilizer were added to a Banbury mixer at a temperature of 160 ° C for 5 minutes to 100 parts by weight of the thermoplastic polyurethane resin.

All. Pellet production step (S5)

Then, the mixture of step (S3) was put into an extruder and extruded at a temperature of 180 ° C to form pellets.

la. Powder production step (S7)

The pellet was pulverized to prepare a thermoplastic polyurethane powder having a particle size of 150 to 250 占 퐉 and a flowability of 10 to 15 seconds.

≪ Example 2 >

Was carried out in the same manner as in Example 1.

I. In the mixing step (S3)

Subsequently, 50 parts by weight of the thermoplastic silicone vulcanizate 1, 6 parts by weight of the high heat-resistant stabilizer and 0.3 part by weight of the light stabilizer were added to a thermosetting polyurethane resin at a temperature of 160 캜 for 5 minutes.

≪ Example 3 >

end. The thermoplastic silicon vulcanate production step (S1)

60 parts by weight of a thermoplastic polyurethane resin, 40 parts by weight of a silicone rubber, 2.5 parts by weight of a curing agent and 0.1 part by weight of a catalyst were charged into a twin-screw extruder and subjected to dynamic vulcanization and mixing at a temperature of 150-300 rpm and 180 ° C to obtain a thermoplastic silicone vulcanizate 2 .

I. In the mixing step (S3)

Subsequently, 30 parts by weight of the thermoplastic silicone vulcanizate 2, 6 parts by weight of the high heat-resistant stabilizer and 0.3 part by weight of the light stabilizer were added to a Banbury mixer at a temperature of 160 ° C for 5 minutes to 100 parts by weight of the thermoplastic polyurethane resin.

D: The same procedure as in Example 1 is carried out.

<Example 4>

Was carried out in the same manner as in Example 3.

I. In the mixing step (S3)

Subsequently, 50 parts by weight of the thermoplastic silicone vulcanizate 2, 6 parts by weight of the high heat-resistant stabilizer and 0.3 part by weight of the light stabilizer were added to a thermosetting polyurethane resin at a temperature of 160 DEG C for 5 minutes.

&Lt; Comparative Example 1 &

end. Thermoplastic Silicon Vulcanization Step (S1): None

I. In the mixing step (S3)

5 parts by weight of paraffin oil, 6 parts by weight of a high heat stabilizer and 0.3 part by weight of a light stabilizer were added to a thermosetting polyurethane resin at a temperature of 160 DEG C for 5 minutes.

D: The same procedure as in Example 1 was carried out.

&Lt; Comparative Example 2 &

end. Thermoplastic Silicon Vulcanization Step (S1): None

I. In the mixing step (S3)

To 100 parts by weight of the thermoplastic polyurethane resin, 30 parts by weight of thermoplastic vulcanizate, 6 parts by weight of the high heat stabilizer and 0.3 part by weight of the light stabilizer were mixed in a Banbury mixer at a temperature of 160 DEG C for 5 minutes.

D: The same procedure as in Example 1 was carried out.

&Lt; Reference Example 1 &

end. Thermoplastic Silicon Vulcanide Production Step (S1): The same procedure as in Example 1 was carried out.

I. In the mixing step (S3)

20 parts by weight of the thermoplastic silicone vulcanizate 1, 6 parts by weight of the high heat stabilizer and 0.3 part by weight of the light stabilizer were added to a thermosetting polyurethane resin at a temperature of 160 캜 for 5 minutes.

D: The same procedure as in Example 1 was carried out.

&Lt; Reference Example 2 &

end. Thermoplastic Silicon Vulcanide Production Step (S1): The same procedure as in Example 1 was carried out.

I. In the mixing step (S3)

80 parts by weight of the thermoplastic silicone vulcanizate 1, 6 parts by weight of the high heat-resistant stabilizer and 0.3 part by weight of the light stabilizer were added to a thermosetting polyurethane resin at a temperature of 160 캜 for 5 minutes.

D: The same procedure as in Example 1 was carried out.

Reference Example 3:

end. Thermoplastic Silicon Vulcanide Production Step (S1): The same procedure as in Example 3 was carried out.

I. In the mixing step (S3)

20 parts by weight of the thermoplastic silicone vulcanizate 2, 6 parts by weight of the high heat-resistant stabilizer and 0.3 part by weight of the light stabilizer were added into a Banbury mixer at a temperature of 160 캜 for 5 minutes to 100 parts by weight of the thermoplastic polyurethane resin.

D: The same procedure as in Example 1 was carried out.

&Lt; Reference Example 4 &

end. Thermoplastic Silicon Vulcanide Production Step (S1): The same procedure as in Example 3 was carried out.

I. In the mixing step (S3)

80 parts by weight of the thermoplastic silicone vulcanizate 2, 6 parts by weight of the high heat-resistant stabilizer and 0.3 part by weight of the light stabilizer were added to a thermosetting polyurethane resin at a temperature of 160 캜 for 5 minutes.

D: The same procedure as in Example 1 was carried out.

Reference Example 5:

end. The thermoplastic silicon vulcanate production step (S1)

95 parts by weight of a thermoplastic polyurethane resin, 5 parts by weight of a silicone rubber, 2.5 parts by weight of a curing agent and 0.1 part by weight of a catalyst were charged into a twin-screw extruder and subjected to dynamic vulcanization and mixing at a temperature of 150-300 rpm and 180 DEG C to obtain thermoplastic silicone vulcanizates .

The procedure of Example 2 was repeated.

Reference Example 6:

end. The thermoplastic silicon vulcanate production step (S1)

40 parts by weight of a thermoplastic polyurethane resin, 60 parts by weight of a silicone rubber, 2.5 parts by weight of a curing agent and 0.1 part by weight of a catalyst were charged into a twin-screw extruder and subjected to dynamic vulcanization and mixing at a temperature of 150-300 rpm and 180 DEG C to obtain thermoplastic silicone vulcanizates .

The procedure of Example 2 was repeated.

Reference Example 7:

end. Thermoplastic Silicon Vulcanization Step (S1): None

I. In the mixing step (S3)

12 parts by weight of silicone rubber, 6 parts by weight of a high heat-resistant stabilizer and 0.3 part by weight of a light stabilizer were mixed in a Banbury mixer at a temperature of 160 DEG C for 5 minutes to 100 parts by weight of a thermoplastic polyurethane resin.

D: The same procedure as in Example 1 was carried out.

Reference Example 8:

end. Thermoplastic Silicon Vulcanization Step (S1): None

I. In the mixing step (S3)

5 parts by weight of silicon gum, 6 parts by weight of a high heat-resistant stabilizer and 0.3 parts by weight of a light stabilizer were mixed in a Banbury mixer at a temperature of 160 DEG C for 5 minutes to 100 parts by weight of a thermoplastic polyurethane resin.

D: The same procedure as in Example 1 was carried out.

At this time, unbridged silicon gum (Wacker chemical, Genioplast pellet S) containing 70% by weight of polydimethylsiloxane and 30% by weight of fumed silica and having a weight average molecular weight of 800,000 g / Respectively.

(3) Manufacture of skin materials for automobile interior materials

The powdery thermoplastic polyurethane composition prepared in the above (1) and (2) was subjected to a powder slush molding process at 230 ° C to prepare a skin material for automobile interior materials.

The contents of the respective components in the skin materials for automobile interior materials of Examples 1 to 4, Comparative Examples 1 to 2, and Reference Examples 1 to 4 are summarized in Table 2 below.

		Example 1	Example 2	Example 3	Example 4	Comparative Example 1	Comparative Example 2	Reference Example 1	Reference Example 2	Reference Example 3	Reference Example 4
Skin material (% by weight)	Thermoplastic polyurethane resin	73.4	64.0	73.4	64.0	89.8	73.4	79.2	53.6	79.2	53.6
	Thermoplastic Silicon Vulcanide 1	22.0	32.0	-	-	-	-	15.8	43.0	-	-
	Thermoplastic Silicon Vulcanide 2	-	-	22.0	32.0	-	-	-	-	15.8	43.0
	Thermoplastic vulcanizate	-	-	-	-	-	22.0	-	-	-	-
	Paraffin oil	-	-	-	-	4.5	-	-	-	-	-
	High heat stabilizer	4.4	3.8	4.4	3.8	5.4	4.4	4.8	3.2	4.8	3.2
	Light stabilizer	0.2	0.2	0.2	0.2	0.3	0.2	0.2	0.2	0.2	0.2

Further, only the contents of the thermoplastic polyurethane resin and the silicone rubber in the skin material for automobile interior materials including the thermoplastic polyurethane compositions of Reference Examples 5 to 8 are shown in Table 3 below.

		Example 1	Example 2	Example 3	Example 4	Comparative Example 1	Comparative Example 2	Reference Example 1	Reference Example 2	Reference Example 3	Reference Example 4	Reference Example 5	Reference Example 6	Reference Example 7	Reference Example 8
Skin material (% by weight)	Thermoplastic polyurethane resin	88.4	85.8	86.2	82.7	89.8	73.4	90.0	83.0	88.4	78.8	93.6	76.4	84.5	89.8
	Silicone rubber	6.4	9.4	8.6	12.4	-	-	4.6	12.6	6.2	16.7	1.5	18.7	10.1	-

[Experimental Example]

1. Measurement of physical properties of skin materials for automobile interior materials

(1) Scratch resistance: The surface of a skin sample for automobile interior material having a width of 5 cm and a length of 20 cm or more was subjected to a load of 100 mm / min using a Heidon scratch tester (SHINTO, HEIDON) according to JIS K 6718, After scratching 100 mm at a speed of s, the load was measured when the scratch width on the surface exceeded 200 탆.

The larger the load, the better the scratch resistance.

(2) Tensile Strength: The skin material for automobile interior materials with a width of 5 cm and a length of 20 cm or more was measured using Universal Testing Machine (UTM) according to ISO 5207-3.

(3) Elongation at break: The surface roughness of 5cm width and 20cm length was measured using universal testing machine (UTM) according to ISO 5207-3.

(4) Gloss change rate: Using a skin test piece for automobile interior materials having a width of 5 cm and a length of 20 cm or more, ultraviolet rays (Xenon arc specified in ISO 105) were irradiated at an incident angle of 60 degrees according to ASTM D563 at 126 MJ And then the glossiness before and after the UV irradiation was measured using a gloss meter (BYK Gardner GLOSS master 60), and the rate of change thereof was calculated.

Gloss change rate = (Gloss before ultraviolet irradiation - Gloss after ultraviolet irradiation) X 100 / (Gloss before ultraviolet irradiation)

(5) Weatherability: Using a universal testing machine (UTM) after irradiation of ultraviolet rays (Xenon arc specified in ISO 105, ISO 105) in an amount of 126MJ using a skin test piece for a car interior material having a width of 5 cm and a length of 20 cm or more And the tensile strength and / or elongation at break before and after aging were measured and the rate of change thereof was calculated.

Change rate of tensile strength = (tensile strength before aging - tensile strength after aging) X 100 / (tensile strength before aging)

Change rate of elongation at break = (elongation at break before aging - elongation at break after aging) X 100 / (elongation at break before aging)

2. Sensibility measurement of skin material for automobile interior material

Internal experts on the skin materials for automobile interior materials evaluated their relative softness (touch) by touching them by hand.

(?: Smooth feeling,?: Normal, X: hard feeling)

3. For automotive interior materials Epidermal  Molding (powder Slush  Molding process)

The degree of melting of the powder, which had or did not dissolve the powder well at the temperature of 220-230 ° C during the powder slush molding process, was visually confirmed.

(OK: Powder was well melted and powder form was not seen, so it was excellent in formability.

NG: Powder was not dissolved well and powder form was visible.

The measurement results of the above 1-3 are shown in Table 4 below.

Properties		Example 1	Example 2	Example 3	Example 4	Comparative Example 1	Comparative Example 2	Reference Example 1	Reference Example 2	Reference Example 3	Reference Example 4	Reference Example 5	Reference Example 6	Reference Example 7	Reference Example 8
Scratch resistance (g)		400g	600g	300g	400g	300g	100g	300g	600g	250g	600g	300g	600g	100g	200g
Tensile Strength (Mpa)		120	100	95	110	160	100	140	80	125	80	140	80	65	50
Elongation at break (%)		400	450	450	450	550	500	500	350	500	350	500	350	300	100
Gloss change rate (%)		5%	3%	5%	2%	70%	45%	8%	2%	8%	2%	8%	2%	30%	40%
Weatherability (%)	Tensile strength change rate	-15%	-10%	-15%	-10%	-35%	-50%	-25%	-5%	-25%	-5%	-25%	-5%	-30%	-30%
	Rate of elongation at break	-20%	-20%	-20%	-10%	-10%	-50%	-20%	-50%	-20%	-50%	-50%	-35%	-50%	-45%
touch		○	○	○	○	○	X	△	X	△	X	△	X	△	△
Powder formability		○	○	○	○	○	○	○	X	○	X	○	X	X	○

As shown in Table 4, Examples 1 to 4 according to the present invention are excellent in moldability of a composition including a specific amount of thermoplastic silicone vulcanizate, and the skin material formed using the silicone vulcanizate has a low rate of gloss change and scratch resistance , Tensile strength, elongation at break, weather resistance, and feel were all excellent.

On the other hand, in Comparative Example 1, which is a skin material containing paraffin oil as the scratch-proofing agent, the weather resistance is lowered and the paraffin oil is eluted to the surface of the skin material as time elapses so that the gloss becomes excessive and buried in the user's hands. Scratch resistance can not be maintained.

In addition, the skin material of Comparative Example 1 has higher tensile strength and elongation at break than the skin materials of Examples 1 to 4, and thus it is confirmed that the skin material of Comparative Example 1 is not suitable for deploying the air bag.

Comparative Example 2, which is a skin material containing other thermoplastic vulcanizates than thermoplastic silicon vulcanizate, has a lower scratch resistance and feel than Examples 1 to 4, and also has a gloss change rate and weather resistance required as a skin material for automobile interior materials We can confirm that it is not satisfied.

In addition, Reference Examples 1 and 3, which are skin materials containing the thermoplastic silicone vulcanizate below a specified content range, and Reference Example 5, which used a small amount of silicone rubber in the production of thermoplastic silicone vulcanizates, exhibited only a slight improvement in scratch resistance, It is confirmed that the weather resistance and the feel are lowered

Reference Examples 2 and 4, which are the skin materials containing the thermoplastic silicon vulcanizate in a specific content exceeding the specific content range, and Reference Example 6 in which the silicone rubber is excessively used in the production of the thermoplastic silicone vulcanizate, are poor in the dispersibility of the silicone rubber in the composition, And mechanical properties such as tensile strength and elongation at break of the skin material and feel are reduced.

Reference Example 7 in which a thermoplastic polyurethane resin and a silicone rubber were immediately mixed together without performing the step of producing a thermoplastic silicone vulcanized product as in Examples 1 to 4 is not preferable because the dispersibility of the silicone rubber in the composition is deteriorated, It was confirmed that the scratch resistance, the tensile strength, the elongation at break, the rate of change in gloss, the weatherability, and the touch were all lowered compared with the skin materials of Examples 1 to 4.

Also, it can be confirmed that Reference Example 8, which is a skin material containing silicone gum which is not a crosslinked thermoplastic silicone vulcanizate but which is not crosslinked, has lower scratch resistance, rate of gloss change, weatherability, and feel as compared with Examples 1 to 4.

Claims (18)

1. 100 parts by weight of a thermoplastic polyurethane resin (A); And

   25 to 70 parts by weight of a thermoplastic silicone vulcanizate (B).
2. The method according to claim 1,

   Wherein the thermoplastic polyurethane resin (A) has a Shore A hardness (ISO 868) of 65 to 92. The thermoplastic polyurethane resin (A)
3. The method according to claim 1,

   Wherein the thermoplastic polyurethane resin (A) has a tensile strength (ISO 527-2) of 5-35 MPa and a elongation at break (ISO 527-2) of 300-520%.
4. The method according to claim 1,

   Wherein the thermoplastic silicone vulcanizate (B) is a form in which a crosslinked silicone rubber (B-2) is dispersed in the thermoplastic polymer matrix (B-1).
5. 5. The method of claim 4,

   Wherein the thermoplastic polymer matrix (B-1) is at least one of polyamide, polypropylene, polyethylene, polyvinyl chloride, polyurethane, polyester, polycarbonate, Wherein the thermoplastic polyurethane composition is at least one thermoplastic polymer selected from the group consisting of polysulfone and polysulfone.
6. 6. The method of claim 5,

   Wherein the thermoplastic polymer matrix (B-1) is a thermoplastic polyurethane resin.
7. 5. The method of claim 4,

   Wherein the weight ratio of the thermoplastic polymer matrix (B-1) to the crosslinked silicone rubber (B-2) is 90: 10-50: 50.
8. The method according to claim 1,

   Wherein the thermoplastic silicone vulcanizate (B) has a Shore A hardness (ISO 868) of 30-80.
9. The method according to claim 1,

   Wherein the thermoplastic silicone vulcanizate (B) has a tensile strength at break (ISO 37) of 3-35 MPa and a breaking elongation (ISO 37) of 600-750%.
10. A step (S1) of producing thermoplastic silicon vulcanizate for producing thermoplastic silicone vulcanizate (B);

    (S3) mixing 25 to 70 parts by weight of the thermoplastic silicone vulcanizate (B) in the step (S1) with 100 parts by weight of the thermoplastic polyurethane resin (A). Way.
11. 11. The method of claim 10,

    Wherein the step (S1) is a step of mixing and dynamically vulcanizing the thermoplastic polymer, the silicone rubber (C), the curing agent and the catalyst, and is carried out at 160-200 占 폚.
12. 12. The method of claim 11,

    Wherein the thermoplastic polymer and the silicone rubber (C) are mixed in a weight ratio of 90-50: 10-50.
13. A skin material for an automobile interior material, produced by using the thermoplastic polyurethane composition for powder slush molding according to any one of claims 1 to 9.
14. 14. The method of claim 13,

    Wherein the skin material for an automobile interior material comprises 50 to 84% by weight of a thermoplastic polyurethane resin and 16 to 40% by weight of a thermoplastic silicon vulcanizate.
15. 14. The method of claim 13,

    Wherein the skin material for automobile interior materials has an scratch resistance (JIS K 6718, g) of 300 to 1500 g.
16. 14. The method of claim 13,

    Wherein the skin material for automobile interior materials has a tensile strength (ISO 5207-3) of 85-150 MPa and a elongation at break (ISO 5207-3) of 350-500%.
17. 14. The method of claim 13,

    (ASTM D563) of -40% to + 40%.
18. 14. The method of claim 13,

    Wherein the skin material for automobile interior materials has a weather resistance of -30% to + 30%.