JP2007106811A - Resin powder composition for slush molding and molding thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin powder composition for slush molding which can be molded into a sheet without encountering sheet break, sheet deformation, etc., when the molded sheet is released from the mold. <P>SOLUTION: The resin powder composition for slush molding is one essentially consisting of a thermoplastic resin powder (B) such as a thermoplastic polyurethane resin powder and an inorganic filler (A), wherein the inorganic filler (A) is contained within individual particles of the thermoplastic resin powder (B), and the inorganic filler (A) is contained in an amount of 5 to 50 wt.% based on the total weight of the thermoplastic resin powder (B) and the inorganic filler (A). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a resin powder composition for slush molding mainly composed of thermoplastic resin powder, which is suitable as a molding material for automobile interior parts such as instrument panels and door trims.

As a molding material for automobile interior parts such as instrument panels and door trims, a thermoplastic resin powder composition for slush molding is known (see, for example, Patent Documents 1 and 2). However, the resin strength is not sufficient, and when the sheet molded on the mold surface is peeled off from the mold in the slush molding process, the molded sheet may be broken or deformed.
JP-A-5-279485 JP 2000-17033 A

  An object of the present invention is to provide a resin powder composition for slush molding that is not torn, deformed, etc. when the sheet is molded using the thermoplastic resin powder composition for slush molding. Is to provide.

  In the present invention, the thermoplastic resin powder (B) and the inorganic filler (A) are essential components, and the inorganic filler (A) is contained in the powder particles of the thermoplastic resin powder (B). B) and a resin powder composition for slush molding characterized by containing 5 to 50% by weight of the inorganic filler (A) with respect to the total weight of the inorganic filler (A), and resin molding comprising the resin powder composition It is a product.

  Since the sheet molded from the slush molding resin powder composition of the present invention is excellent in tensile strength and tear strength, it is not torn or deformed when the mold is removed.

  The resin powder composition for slush molding of the present invention comprises the thermoplastic resin powder (B) (hereinafter also simply referred to as (B)) and the inorganic filler (A) (hereinafter also simply referred to as (A)) as essential components. And 5 to 50% by weight, preferably 5.5 to 30% by weight, more preferably 6.5% by weight of the inorganic filler (A) with respect to the total weight of the thermoplastic resin powder (B) and the inorganic filler (A). Contains -20% by weight. If the content of (A) is less than 5% by weight based on the total weight of (B) and (A), the reinforcing effect of (A) cannot be sufficiently exerted, and the molded sheet is torn during mold release, Deformation may occur. When (A) is contained exceeding 50% by weight, the meltability is deteriorated, so that the strength of the molded sheet is lowered.

  The inorganic filler (A) is contained in the powder particles of the thermoplastic resin powder (B) and is contained in the slush molding resin powder composition of the present invention. When (A) is contained in the powder particles of (B), it is more uniformly dispersed in the molded resin sheet as compared with the case where the particles of (A) are not contained in the powder particles of (B). can do. By taking such an embodiment, the molded resin sheet obtained by molding the slush molding resin powder composition of the present invention is excellent in tensile strength and tear strength, and therefore it is torn and deformed when the mold is removed. Absent. In particular, when the thermoplastic resin is a polyurethane resin, (A) uniformly dispersed in the polyurethane resin is preferable because it can promote crystallization of the hard segment of the polyurethane resin and improve the tensile strength and tear strength. .

  Examples of the inorganic filler (A) include talc, kaolin, silica, titanium oxide, calcium carbonate, bentonite, mica, sericite, glass flake, glass fiber, graphite, magnesium hydroxide, aluminum hydroxide, antimony trioxide, and sulfuric acid. Examples thereof include barium, zinc borate, alumina, magnesia, wollastonite, zonotlite, whiskers (such as graphite, silicon carbide, and metal) and metal powders. Among these, talc, kaolin, silica, titanium oxide, and calcium carbonate are preferable from the viewpoint of promoting crystallization of the thermoplastic resin, and talc and kaolin are more preferable.

  The volume average particle diameter of the inorganic filler (A) is preferably 0.1 to 30 μm, more preferably 1 to 20 μm, and particularly preferably 5 to 10 μm from the viewpoint of dispersibility in the thermoplastic resin.

  The volume average particle size of the powder particles of the thermoplastic resin powder (B) containing the inorganic filler (A) is preferably 50 to 400 μm, more preferably 100 to 200 μm.

  The volume average particle size of the powder particles of the inorganic filler (A) and the thermoplastic resin powder (B) is measured by a laser diffraction / scattering method, for example, a microtrack particle size analyzer (MKIIISRA 7997-10 manufactured by Nikkiso Co., Ltd.). Can be measured.

The content rate of the inorganic filler (A) contained in the powder particles of the thermoplastic resin powder (B) can be measured by the following method. That is, about 1 g (Xg) of a resin powder composition for slush molding is precisely weighed, heated and carbonized on a 300 ° C. hot plate until no black smoke is generated, and then in an electric furnace at 450 ° C. over 2 hours. After ashing and cooling in a desiccator, the weight of ash (Yg) is weighed. The content of (A) with respect to the total weight of (B) and (A) is calculated by the following equation.
Content ratio of (A) = 100 × (Y / X)

  Moreover, the volume average particle diameter of the inorganic filler (A) contained in the powder particles of the thermoplastic resin powder (B) can be measured by the following method. That is, 1000 ml of dimethylformamide is added to 20 g of a resin powder composition for slush molding and heated at 100 ° C. for 1 hour. The dimethylformamide insoluble matter is filtered off and dried, and the volume average particle size is measured by the above method.

  The thermoplastic resin powder (B) is not particularly limited as long as it is a resin powder that can be used for slush molding. Preferable examples include (hereinafter, described by omitting thermoplasticity) polyurethane resin powder (B0), vinyl chloride resin powder, polyolefin resin powder, vinyl aromatic resin powder, acrylate resin powder, conjugated diene resin powder, and The mixture of these 2 or more types is mentioned, A polyurethane resin powder (B0) is especially preferable.

The polyurethane resin in the polyurethane resin powder (B0) is a resin composed of a high-molecular polyol, polyisocyanate, and a low-molecular diol, a low-molecular diamine, if necessary.
Examples of the polyurethane resin powder (B0) include those produced by the following production method.
(1) A resin having a urethane bond and a urea bond, which is produced by reacting an isocyanate group-terminated urethane prepolymer with a blocked chain extender (for example, a ketimine compound) in the presence of water and a dispersion stabilizer. Things. Specifically, for example, those described in JP-A-8-120041 can be used.
(2) Produced by a method in which a urethane prepolymer having a urethane bond and a urea bond is reacted with a chain extender (for example, diamine and / or glycol) in the presence of an organic solvent in which the urethane prepolymer does not dissolve and a dispersion stabilizer. What will be done. Specifically, for example, those described in JP-A-4-202331 can be used.
(3) A lump of thermoplastic polyurethane resin is obtained by reacting a diisocyanate, a polymer polyol, and, if necessary, a chain extender (low molecular glycol, low molecular diamine). Then, it is manufactured by a method of pulverization (for example, freeze pulverization, a method of cutting through pores in a molten state).

  Examples of the vinyl chloride resin powder include a vinyl chloride homopolymer resin powder produced by a suspension polymerization method or a bulk polymerization method, and a copolymer resin powder mainly composed of a vinyl chloride monomer and a vinyl chloride monomer such as ethylene vinyl acetate. included.

  Any polyolefin resin powder can be used as long as it generally belongs to an olefinic thermoplastic elastomer. Furthermore, an olefin-based thermoplastic elastomer in which an ethylene-propylene-diene-rubber (EPM, EPDM) and a polyolefin containing a propylene-based polymer are combined can be given. Also, fine powder of olefin thermoplastic elastomer made of α-olefin copolymer and fine powder of olefin thermoplastic elastomer made of α-olefin copolymer and propylene resin can be used.

  The vinyl aromatic resin powder includes a resin powder of an aromatic vinyl compound homopolymer and a resin powder of a copolymer of an aromatic vinyl compound and a vinyl monomer. Examples of the aromatic vinyl compound include styrene, t-butyl styrene, α-methyl styrene, p-methyl srene, divinyl benzene, 1,1-diphenyl styrene, bromo styrene, vinyl styrene, vinyl xylene, fluoro styrene, ethyl styrene, and the like. In particular, styrene and α-methylstyrene are preferable.

  Examples of the acrylate resin powder include a resin powder of a (meth) acrylic acid ester homopolymer and a resin powder of a copolymer of a (meth) acrylic acid ester and a vinyl monomer.

  The conjugated diene resin powder is a copolymer resin powder obtained by hydrogenating or partially hydrogenating a conjugated diene part in a conjugated diene copolymer, and an aromatic vinyl compound-conjugated diene compound random copolymer. Resin resin powders such as coalescence, aromatic vinyl compound-conjugated diene compound block copolymer hydrogenated product, conjugated diene compound block copolymer hydrogenated product, and the like are included.

  In order to contain the inorganic filler (A) in the powder particles of the thermoplastic resin powder (B), for example, (1) (A) is added and a polymerization reaction is performed to produce (B), (2) What is necessary is just to employ | adopt the method etc. which grind | pulverize and pulverize the thermoplastic resin particle and (A) after heat-kneading. Specifically, for example, the method (1) will be described. When (B) is a polyurethane resin powder, (A) is dispersed in advance in, for example, a polymer polyol or a urethane prepolymer, and the polyurethane resin is used. A method for producing particles may be mentioned. In the case of vinyl chloride resin powder, polyolefin resin powder, vinyl aromatic resin powder, acrylate resin powder, and conjugated diene resin powder, for example, (A) is dispersed in each monomer in advance. A method for producing particles may be mentioned. In the present invention, (A) is contained in the powder particles of (B), for example, at least a part of the inorganic filler (A) is embedded in the powder particles of the thermoplastic resin powder (B). It includes the state that is.

  In addition to the above components, an additive aid (C) can be added to the slush molding resin powder composition of the present invention as necessary, as long as the object of the present invention is not impaired. As the additive aid (C), known and commonly used pigments, plasticizers, mold release agents, organic fillers, antiblocking agents, dispersants, ultraviolet absorbers (light stabilizers), antioxidants and the like can be added.

  The resin powder composition for slush molding of the present invention can be molded into various resin molded products by a slush molding method. For molding by the slush molding method, for example, a box containing the powder composition of the present invention and a mold heated to 200 to 280 ° C. are vibrated and rotated to melt and flow the powder in the mold, and then cooled. Then, it can solidify and can implement suitably by the method of manufacturing an epidermis.

  The skin thickness molded with the slush molding resin powder composition of the present invention is preferably 0.5 to 1.5 mm. The skin is suitably used for automobile interior materials such as instrument panels and door trims.

Examples Hereinafter, the present invention will be described in more detail with reference to production examples and examples, but the present invention is not limited thereto. In the following, “parts” represents parts by weight, and “%” represents% by weight.

Production Example 1
Production of Prepolymer Solution 1 Polybutylene adipate (356 parts) with a number average molecular weight (hereinafter referred to as Mn) of 1000 and polyhexahexene with Mn of 900 are placed in a reaction vessel equipped with a thermometer, a stirrer and a nitrogen blowing tube. Methylene isophthalate (237 parts) and kaolin (87.5 parts) having a volume average particle size of 9.2 μm were charged, purged with nitrogen, heated to 110 ° C. with stirring, uniformly stirred, and then cooled to 60 ° C. Subsequently, 1-octanol (9.5 parts), hexamethylene diisocyanate (151 parts), tetrahydrofuran (155 parts), stabilizer (2.5 parts) [manufactured by Ciba Specialty Chemicals Co., Ltd., Irganox 1010] And reacted at 85 ° C. for 6 hours to obtain a prepolymer solution 1. The NCO content of the obtained prepolymer solution was 2.0%.

Production Example 2
Production of Prepolymer Solution 2 In a reaction vessel equipped with a thermometer, a stirrer and a nitrogen blowing tube, polybutylene adipate (356 parts) with Mn of 1000, polyhexamethylene isophthalate (237 parts) with Mn of 900, volume After charging kaolin (53.2 parts) with an average particle size of 9.2 μm and purging with nitrogen, the mixture was heated to 110 ° C. with stirring, uniformly stirred, and then cooled to 60 ° C. Subsequently, 1-octanol (9.5 parts), hexamethylene diisocyanate (151 parts), tetrahydrofuran (155 parts), stabilizer (2.5 parts) [manufactured by Ciba Specialty Chemicals Co., Ltd., Irganox 1010] Was added and reacted at 85 ° C. for 6 hours to obtain Prepolymer Solution 2. The NCO content of the resulting prepolymer solution was 2.1%

Production Example 3
Production of Prepolymer Solution 3 In a reaction vessel equipped with a thermometer, a stirrer and a nitrogen blowing tube, polybutylene adipate (356 parts) with Mn of 1000, polyhexamethylene isophthalate (237 parts) with Mn of 900, volume Kaolin (439 parts) having an average particle diameter of 9.2 μm was charged and purged with nitrogen, and then heated to 110 ° C. with stirring, uniformly stirred, and then cooled to 60 ° C. Subsequently, 1-octanol (9.5 parts), hexamethylene diisocyanate (151 parts), tetrahydrofuran (155 parts), stabilizer (2.5 parts) [manufactured by Ciba Specialty Chemicals Co., Ltd., Irganox 1010] Was added and reacted at 85 ° C. for 6 hours to obtain Prepolymer Solution 3. The NCO content of the obtained prepolymer solution was 1.5%.

Production Example 4
Production of Prepolymer Solution 4 In a reaction vessel equipped with a thermometer, a stirrer and a nitrogen blowing tube, polybutylene adipate (356 parts) with Mn of 1000, polyhexamethylene isophthalate (237 parts) with Mn of 900, volume After charging talc (87.5 parts) with an average particle size of 8.0 μm and purging with nitrogen, the mixture was heated to 110 ° C. with stirring, uniformly stirred, and then cooled to 60 ° C. Subsequently, 1-octanol (9.5 parts), hexamethylene diisocyanate (151 parts), methyl ethyl ketone (155 parts), stabilizer (2.5 parts) [manufactured by Ciba Specialty Chemicals, Inc., Irganox 1010] And reacted at 85 ° C. for 6 hours to obtain a prepolymer solution 4. The NCO content of the obtained prepolymer solution was 2.0%.

Production Example 5
Production of prepolymer solution 5 A reaction vessel equipped with a thermometer, a stirrer and a nitrogen blowing tube was charged with polybutylene adipate (356 parts) with Mn of 1000 and polyhexamethylene isophthalate (237 parts) with Mn of 900. After substituting with nitrogen, the mixture was heated to 110 ° C. with stirring, stirred uniformly and then cooled to 60 ° C. Subsequently, kaolin (87.5 parts) having a volume average particle diameter of 9.2 μm, 1-octanol (9.5 parts), hexamethylene diisocyanate (151 parts), tetrahydrofuran (155 parts), stabilizer (2.5 parts) ) [Ciba Specialty Chemicals Co., Ltd., Irganox 1010] was added and reacted at 85 ° C. for 6 hours to obtain Prepolymer Solution 5. The NCO content of the obtained prepolymer solution was 2.0%.

Comparative production example 1
Production of prepolymer solution 6 In a reaction vessel equipped with a thermometer, a stirrer and a nitrogen blowing tube, polybutylene adipate (356 parts) with Mn of 1000, polyhexamethylene isophthalate (237 parts) with Mn of 900, volume Kaolin (28 parts) having an average particle size of 9.2 μm was charged and purged with nitrogen, then heated to 110 ° C. with stirring, uniformly stirred, and then cooled to 60 ° C. Subsequently, 1-octanol (9.5 parts), hexamethylene diisocyanate (151 parts), tetrahydrofuran (155 parts), stabilizer (2.5 parts) [manufactured by Ciba Specialty Chemicals Co., Ltd., Irganox 1010] And reacted at 85 ° C. for 6 hours to obtain a prepolymer solution 6. The obtained prepolymer solution had an NCO content of 2.2%.

Comparative production example 2
Production of prepolymer solution 7 In a reaction vessel equipped with a thermometer, a stirrer and a nitrogen blowing tube, polybutylene adipate (356 parts) with Mn of 1000, polyhexamethylene isophthalate (237 parts) with Mn of 900, volume Kaolin (1481 parts) having an average particle diameter of 9.2 μm was charged and purged with nitrogen, and then heated to 110 ° C. with stirring, uniformly stirred, and then cooled to 60 ° C. Subsequently, 1-octanol (9.5 parts), hexamethylene diisocyanate (151 parts), tetrahydrofuran (155 parts), stabilizer (2.5 parts) [manufactured by Ciba Specialty Chemicals Co., Ltd., Irganox 1010] And reacted at 85 ° C. for 6 hours to obtain a prepolymer solution 7. The NCO content of the obtained prepolymer solution was 0.9%.

Comparative production example 3
Preparation of prepolymer solution 8 A reaction vessel equipped with a thermometer, a stirrer, and a nitrogen blowing tube was charged with polybutylene adipate (356 parts) with Mn of 1000 and polyhexamethylene isophthalate (237 parts) with Mn of 900. After substituting with nitrogen, the mixture was heated to 110 ° C. with stirring, stirred uniformly and then cooled to 60 ° C. Subsequently, 1-octanol (9.5 parts), hexamethylene diisocyanate (151 parts), tetrahydrofuran (155 parts), stabilizer (2.5 parts) [manufactured by Ciba Specialty Chemicals Co., Ltd., Irganox 1010] And reacted at 85 ° C. for 6 hours to obtain a prepolymer solution 8. The obtained prepolymer solution had an NCO content of 2.2%.

Production Example 6
Production of ketimine product of methyl ethyl ketone (hereinafter referred to as MEK) of diamine Hexamethylene diamine (116 parts), excess MEK (288 parts, 4 times molar amount with respect to diamine), n-hexane (29 parts) at 80 ° C. The product water was removed out of the system while refluxing for 24 hours. Thereafter, unreacted MEK and n-hexane were removed under reduced pressure to obtain a MEK ketiminate.

Production production example 7 of thermoplastic polyurethane resin powder
The prepolymer solution 1 obtained in Production Example 1 (100 parts) and the MEK ketimine compound obtained in Production Example 6 (5.6 parts) are charged into a reaction vessel, and a dispersant (manufactured by Sanyo Chemical Industries, Ltd.) is added thereto. 340 parts by weight of an aqueous solution in which Sunspear PS-8 (25 parts by weight) was dissolved was added and mixed for 1 minute at a rotation speed of 9000 rpm using an ultradisperser manufactured by Yamato Scientific Co., Ltd. The mixture was mixed with a thermometer and a stirrer. The reaction vessel was transferred to a reaction vessel equipped with a nitrogen blowing tube, purged with nitrogen, and allowed to react with stirring for 10 hours at 50 ° C. After completion of the reaction, filtration and drying were performed to obtain a thermoplastic polyurethane resin powder (P-1 (P-1) had a Mn of 25,000 and a volume average particle size of 151 μm.

Production Example 8
The prepolymer solution 2 (96.6 parts) obtained in Production Example 2 and the MEK ketimine compound (5.6 parts) obtained in Production Example 6 were introduced into a reaction vessel, and a dispersant (Sanyo Chemical Industries Co., Ltd.) was added thereto. ) 340 parts by weight of an aqueous solution in which Sunspear PS-8 (25 parts by weight) was dissolved, and mixed for 1 minute at a rotational speed of 9000 rpm using an ultradisperser manufactured by Yamato Scientific Co., Ltd. The mixture was transferred to a reaction vessel equipped with a stirrer and a nitrogen blowing tube, purged with nitrogen, and allowed to react with stirring for 10 hours at 50 ° C. After completion of the reaction, filtration and drying were performed to obtain a thermoplastic polyurethane resin powder (P 2) Mn of (P-2) was 25,000, and the volume average particle diameter was 150 μm.

Production Example 9
The prepolymer solution 3 (135.2 parts) obtained in Production Example 3 and the MEK ketimine compound (5.6 parts) obtained in Production Example 6 were introduced into a reaction vessel, and a dispersant (Sanyo Chemical Industries Co., Ltd.) was added thereto. ) 340 parts by weight of an aqueous solution in which Sunspear PS-8 (25 parts by weight) was dissolved, and mixed for 1 minute at a rotational speed of 9000 rpm using an ultradisperser manufactured by Yamato Scientific Co., Ltd. The mixture was transferred to a reaction vessel equipped with a stirrer and a nitrogen blowing tube, purged with nitrogen, and allowed to react with stirring for 10 hours at 50 ° C. After completion of the reaction, filtration and drying were performed to obtain a thermoplastic polyurethane resin powder (P (P-3) had an Mn of 27,000 and a volume average particle size of 147 μm.

Production Examples 10 and 11
The prepolymer solutions 4 and 5 obtained in Production Examples 4 and 5 were subjected to the same operation as in Production Example 7 to produce thermoplastic polyurethane resin powders (P-4) and (P-5). Mn of (P-4) was 25,000, volume average particle diameter was 151 μm, Mn of (P-5) was 25,000, and volume average particle diameter was 150 μm.

Comparative production example 4
The prepolymer solution 6 (94 parts) obtained in Comparative Production Example 1 and the MEK ketimine compound (5.6 parts) obtained in Production Example 6 were introduced into a reaction vessel, and a dispersant (Sanyo Chemical Industries, Ltd.) was added thereto. 340 parts by weight of an aqueous solution prepared by dissolving Sunspear PS-8 (25 parts by weight) was added and mixed for 1 minute at a rotation speed of 9000 rpm using an ultradisperser manufactured by Yamato Scientific Co., Ltd. The mixture was thermometered and stirred. The mixture was transferred to a reaction vessel equipped with a machine and a nitrogen blowing tube, purged with nitrogen, and allowed to react with stirring for 10 hours at 50 ° C. After completion of the reaction, filtration and drying were performed to obtain thermoplastic polyurethane resin powder (P- 6 ′) was produced, the Mn of (P-6 ′) was 26,000, and the volume average particle size was 152 μm.

Comparative Production Example 5
A prepolymer solution 7 (239.6 parts) obtained in Comparative Production Example 2 and a MEK ketimine compound (5.6 parts) obtained in Production Example 6 were introduced into a reaction vessel, and a dispersant (Sanyo Chemical Industries ( 340 parts by weight of an aqueous solution in which Sunspearl PS-8 (25 parts by weight) manufactured by Co., Ltd. was dissolved was added, and mixed for 1 minute at a rotation speed of 9000 rpm using an ultradisperser manufactured by Yamato Scientific Co., Ltd. This mixture was a thermometer. Then, the mixture was transferred to a reaction vessel equipped with a stirrer and a nitrogen blowing tube, purged with nitrogen, and allowed to react with stirring for 10 hours at 50 ° C. After completion of the reaction, filtration and drying were performed to obtain a thermoplastic polyurethane resin powder ( P-7 ′) was produced, Mn of (P-7 ′) was 24,000, and the volume average particle size was 152 μm.

Comparative Production Example 6
A prepolymer solution 8 (91.2 parts) obtained in Comparative Production Example 3 and a MEK ketimine compound (5.6 parts) obtained in Production Example 6 were introduced into a reaction vessel, and a dispersant (Sanyo Chemical Industries ( 340 parts by weight of an aqueous solution in which Sunspearl PS-8 (25 parts by weight) manufactured by Co., Ltd. was dissolved was added and mixed for 1 minute at a rotation speed of 9000 rpm using an ultradisperser manufactured by Yamato Scientific Co., Ltd. The thermometer The mixture was transferred to a reaction vessel equipped with a stirrer and a nitrogen blowing tube, purged with nitrogen, and allowed to react with stirring for 10 hours at 50 ° C. After completion of the reaction, filtration and drying were performed to obtain a thermoplastic polyurethane resin powder ( P-8 ′) was produced, the Mn of (P-8 ′) was 26,000, and the volume average particle size was 151 μm.

Example 1
In a 100 L Nauta mixer, 100 parts of thermoplastic polyurethane resin powder (P-1) and 20 parts of polyethylene glycol dibenzoate [manufactured by Sanyo Chemical Industries, Ltd .; Sunfix EB300] are added and mixed at 70 ° C. for 3 hours. did. Next, 0.1 part of modified dimethylpolysiloxane [manufactured by Shin-Etsu Chemical Co., Ltd .; KF96] was added as a release agent, mixed for 1 hour, and then cooled to room temperature. Subsequently, 0.3 part of silica fine powder silo block S200 (made by Grace Devison Chemical) was added and mixed as an antiblocking agent to obtain a resin powder composition for slush molding (S-1). The content of kaolin relative to the weight of (S-1) was 8.3%. The volume average particle diameter of the powder particles of (S-1) was 152 μm.

Examples 2-5
In Example 1, (P-2) to (P-5) were used in place of the thermoplastic polyurethane resin powder (P-1), and the others were similarly performed. ) To (S-5) were obtained. The contents of kaolin with respect to the weights of (S-2), (S-3), and (S-5) were 5.3%, 30%, and 8.3%, respectively. Moreover, the content rate with respect to the weight of (S-4) of a talc was 8.3%. The volume average particle diameters of the powder particles of (S-2) to (S-5) were 151 μm, 148 μm, 152 μm, and 151 μm, respectively.

Comparative Examples 1 and 2
In Example 1, instead of the thermoplastic polyurethane resin powder (P-1), (P-6 ′) and (P-7 ′) were used, and the rest was made in the same manner, and the resin powder composition for slush molding (S -6 ′) and (S-7 ′). The contents of kaolin relative to the weight of (S-6 ′) and (S-7 ′) were 2.9% and 54%, respectively. The volume average particle diameters of the powder particles of (S-6 ′) and (S-7 ′) were 153 μm and 153 μm, respectively.

Comparative Example 3
In a 100 L Nauta mixer, 90.2 parts of thermoplastic polyurethane resin powder (P-8 ′) and 19 parts of polyethylene glycol dibenzoate [manufactured by Sanyo Chemical Industries, Ltd .; Sunfix EB300] were added at 70 ° C. Mixed for 3 hours. Next, 0.1 part of modified dimethylpolysiloxane [manufactured by Shin-Etsu Chemical Co., Ltd .; KF96] and kaolin (9.8 parts) having a volume average particle size of 9.2 μm were added, mixed for 1 hour, and then cooled to room temperature. Next, 0.3 parts of silica fine powder silo block S200 (produced by Grace Devison Chemical) was added and mixed to obtain a resin powder composition for slush molding (S-8 ′). The content of kaolin relative to the weight of (S-8 ′) was 8.2%. The volume average particle diameter of the powder particles of (S-8 ′) was 152 μm.

  Slush molding resin powder compositions (S-1) to (S-5) of Examples 1 to 5 and Slush molding resin powder compositions (S-6 ′) to (S-8) of Comparative Examples 1 to 3. ') Was used to create a sheet as shown below. The tensile strength and tear strength of the sheet were measured, and the results are shown in Table 1.

<Method for creating molded sheet>
The resin powder composition for slush molding was brought into contact with a mold heated to 270 ° C. for 10 seconds. After heat melting, unmelted powder was removed, left at room temperature for 1 minute, and then cooled with water to prepare a molded sheet.

<Evaluation method>
The molded sheet prepared by the above method was measured for tensile strength and tear strength by the following method within 30 minutes after preparation.
-Tensile strength was measured according to JIS K6251-2004.
-Tear strength was measured according to JIS K6252-2004.
However, regarding the condition adjustment of the test piece, measurement was performed within 30 minutes after the formation of the molded sheet without conforming to JIS K6250-2004.
The tensile strength and tear strength measured within 30 minutes after creation of the molded sheet are correlated with tearing, deformation, etc. that occur when the molded sheet is removed from the mold.

  As can be seen from Examples 1 to 5, the resin powder having the constitution of the present invention is excellent in both tensile strength and tear strength, and the content of the inorganic filler is too small (Comparative Example 1) or too large (Comparative Example 2). ), The remarkable performance is obvious. Further, in Comparative Example 3 in which the inorganic filler is not contained in the resin powder, the tensile strength and the tear strength are both the resin powder of the present invention even if the content of the inorganic filler is within the range of the resin powder of the present invention. The performance of the resin powder of the present invention is obvious from this point as well.

The skin formed from the resin powder composition for slush molding of the present invention is suitably used as a skin for automobile interior materials such as instrument panels and door trims.

Claims (6)

The thermoplastic resin powder (B) and the inorganic filler (A) are essential components, and the inorganic filler (A) is contained in the powder particles of the thermoplastic resin powder (B), and the thermoplastic resin powder (B) and inorganic A resin powder composition for slush molding, comprising 5 to 50% by weight of the inorganic filler (A) based on the total weight of the filler (A). The resin powder composition according to claim 1, wherein the inorganic filler (A) is at least one inorganic filler selected from the group consisting of talc, kaolin, silica, titanium oxide, and calcium carbonate. The resin powder composition according to claim 1 or 2, wherein the inorganic filler (A) has a volume average particle size of 0.1 to 30 µm. The resin powder composition according to any one of claims 1 to 3, wherein the thermoplastic resin powder (B) is a thermoplastic polyurethane resin powder (B0). The resin molded product which consists of a resin powder composition of any one of Claims 1-4. The resin molded product according to claim 5, which is an automobile interior material.