JP2018104539A - Interior skin material for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interior skin material for a vehicle which has good abrasion resistance without coating thereon, is low in adhesion to metal, and has good light resistance and heat resistance.SOLUTION: An interior skin material for a vehicle is obtained from a thermoplastic elastomer resin composition which contains 50-94 pts.wt. of an urethane-based thermoplastic elastomer (A), an olefinic thermoplastic elastomer (B) and an amine-modified styrenic thermoplastic elastomer (C), where an isocyanate component of the urethane-based thermoplastic elastomer (A) is non-yellowed isocyanate, and a blending ratio [(A)/(B)] of the urethane-based thermoplastic elastomer (A) to the olefinic thermoplastic elastomer (B) is 1.05 to 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle interior skin material.

Conventionally, as an interior material for vehicle instrument panels, consoles, etc., a resin material such as foamed resin or non-foamed resin and a synthetic resin skin material (that is, a vehicle interior skin material) are laminated and integrated. Is commonly used.
As the vehicle interior skin material, a sheet-like material made of an olefin-based thermoplastic elastomer (TPO) is shaped into a predetermined shape and used.

In addition, the vehicle interior skin material is required to have wear resistance in order to be touched by an occupant, and is further required to have light resistance in order to be exposed to ultraviolet rays incident on the interior of the vehicle. Further, since the interior of the vehicle interior skin material becomes hot in the summer, heat resistance that does not deform in the hot interior is required.
However, an interior skin material for a vehicle made of an olefin-based thermoplastic elastomer has a problem of insufficient wear resistance, so that a coating for the purpose of protecting the surface is indispensable, increasing the product cost.

JP 2010-285484 A

  In order to solve the above problems, we examined urethane-based thermoplastic elastomers (TPU) that are excellent in wear resistance and mechanical properties, and the skin material made only of urethane-based thermoplastic elastomers has high adhesion to metals and is processed. It turns out that there is a problem. For example, when molding an interior skin material for a vehicle, there is a problem that the resin composition is closely adhered to a metal cooling roller in a process of extruding the resin composition from an extruder into a sheet shape and subsequently cooling it through a metal cooling roller. is there.

  The present invention has been made in view of the above points, and has a good abrasion resistance without coating the surface, a low adhesion to metal, and a vehicle having good light resistance and heat resistance. The purpose is to provide interior skin materials.

  The invention of claim 1 is a vehicle interior skin material obtained from a thermoplastic elastomer resin composition, wherein the thermoplastic elastomer resin composition comprises 50 to 94 parts by weight of a urethane-based thermoplastic elastomer (A). , An olefin-based thermoplastic elastomer (B), and an amine-modified styrene-based thermoplastic elastomer (C), wherein the isocyanate component of the urethane-based thermoplastic elastomer (A) is a non-yellowing isocyanate, and the urethane-based The blending ratio [(A) / (B)] of the thermoplastic elastomer (A) and the olefinic thermoplastic elastomer (B) is 1.05 to 20.

  The invention of claim 2 is characterized in that, in claim 1, the non-yellowing isocyanate is an alicyclic isocyanate.

  The invention of claim 3 is characterized in that, in claim 1 or 2, the amine-modified styrene thermoplastic elastomer (C) is an amine-modified hydrogenated styrene thermoplastic elastomer.

  ADVANTAGE OF THE INVENTION According to this invention, even if it does not give a coating to the surface, it has favorable abrasion resistance, it has favorable light resistance, and also the vehicle interior skin material with low adhesiveness with respect to a metal is obtained.

It is a table | surface which shows the structure and evaluation result of an Example. It is a table | surface which shows the structure and evaluation result of a comparative example.

  Hereinafter, an embodiment of a vehicle interior skin material of the present invention will be described. The vehicle interior skin material of the present invention is used as a skin material for vehicle interior materials such as instrument panels and consoles. Note that vehicle interior materials such as instrument panels and consoles generally have a configuration in which a vehicle interior skin material is laminated on the surface of a resin member such as a foam or a non-foam.

  The vehicle interior skin material of the present invention is obtained from a thermoplastic elastomer resin composition. The thermoplastic elastomer resin composition contains a urethane-based thermoplastic elastomer (A), an olefin-based thermoplastic elastomer (B), and an amine-modified styrene-based thermoplastic elastomer (C).

The urethane-based thermoplastic elastomer (A) is obtained by reacting polyol, isocyanate, chain extender and the like.
Examples of the polyol include polyether polyol, polyester polyol, polyester ether polyol, and polycarbonate polyol.

Examples of the polyether polyol include polyethylene glycol, polypropylene glycol, and polytetramethylene glycol.
Polyester polyols include malonic acid, succinic acid, methyl succinic acid, glutaric acid, aliphatic dicarboxylic acid such as adipic acid, pimelic acid and sebacic acid, cycloaliphatic dicarboxylic acid such as cyclohexanedicarboxylic acid, isophthalic acid, terephthalic acid, orthophthalic acid Acids, aromatic dicarboxylic acids such as naphthalenedicarboxylic acid, their acid esters or acid anhydrides, and the like, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1.6-hexanediol, 1,8-octanediol, 2-methyl-1,8-octanediol, 1,9-nonanediol, 2-methyl- 1,9-nonanediol, 1,10 Decanediol, 1,4 by dehydration condensation reaction between cyclohexanediol low molecular polyols such as, or a polyester polyol obtained by ring-opening polymerization of lactones.

  Polyester ether polyols include aliphatic dicarboxylic acids such as succinic acid, adipic acid, sebacic acid and azelaic acid, aromatic dicarboxylic acids such as phthalic acid, terephthalic acid and isophthalic acid naphthalenedicarboxylic acid, hexahydrophthalic acid, hexahydroterephthalic acid Products obtained by dehydration condensation reaction of acids, alicyclic dicarboxylic acids such as hexahydroisophthalic acid, or acid esters or anhydrides thereof with glycols such as diethylene glycol or propylene oxide adducts, or mixtures thereof Etc.

  Examples of the polycarbonate polyol include ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 2,2-dimethyl-1,3-propanediol, 1, Examples include polycarbonate polyols obtained by reacting polyhydric alcohols such as 8-octanediol with diethylene carbonate, dimethyl carbonate, diphenyl carbonate, and the like.

  As the isocyanate, non-yellowing isocyanate is used in order to suppress discoloration of the vehicle interior skin material due to ultraviolet rays. Non-yellowing isocyanates include aliphatic diisocyanates or alicyclic diisocyanates. The alicyclic diisocyanate is more preferable than the aliphatic diisocyanate because it is more rigid and excellent in strength, and thus wear resistance and mechanical properties are improved.

Examples of the aliphatic diisocyanate include tetramethylene diisocyanate, hexamethylene diisocyanate (HDI), 2-methyl-pentane-1,5-diisocyanate, 3-methyl-pentane-1,5-diisocyanate, and lysine isocyanate.
As alicyclic diisocyanates, norbornane diisocyanate (NBDI), isophorone diisocyanate (IPDI), hydrogenated tolylene diisocyanate (hydrogenated TDI), hydrogenated xylylene diisocyanate (hydrogenated XDI), hydrogenated diphenylmethane diisocyanate (hydrogenated MDI) Etc.

  As the chain extender, a low molecular compound having at least two active hydrogen atoms that react with isocyanate is used. Examples of chain extenders include ethylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, 2 -Methyl-1,5-pentanediol, 3-methyl-1,5-pentanediol, diethylene glycol, trioxyethylene glycol and the like can be mentioned, and one kind or two kinds can be used in combination.

  The olefinic thermoplastic elastomer (B) uses olefinic resins such as polypropylene (PP) and polyethylene (PE) for the hard segment, and ethylene-propylene rubber (EPM) and ethylene-propylene-diene rubber (EPDM) for the soft segment. A mixture of materials with rubber elasticity such as polypropylene (PP), polyethylene (PE) and other olefin resins are used for the hard segment, and ethylene and α-olefin (butylene, hexene, octene, etc.) are randomly used for the soft segment. Or it consists of the copolymer copolymerized to the block. The olefin-based thermoplastic elastomer (B) of the copolymer is preferably a block copolymer from the viewpoint of stability such as mechanical properties and quality, and examples thereof include an ethylene / α-olefin block copolymer. .

  The amine-modified styrene-based thermoplastic elastomer (C) is a styrene-based thermoplastic elastomer that has been amine-modified, and the urethane-based thermoplastic elastomer (A) and the olefin-based thermoplastic elastomer (B) having poor compatibility are uniformly formed. It has the function of mixing. Amine-modified styrenic thermoplastic elastomers include hard segment polystyrene and soft segment butadiene (SBS), isoprene (SIS), hydrogenated hydrogenated styrene (SEBS, SEPS), etc. Is mentioned. Hydrogenated SEBS and SEPS are more preferable because light resistance, heat resistance, and strength are improved as compared to non-hydrogenated SBS and SIS.

  Moreover, the method of amine-modifying a styrene-type thermoplastic elastomer is not specifically limited, It performs by a well-known method. For example, a method of modifying an amine by polymerizing a (hydrogenated) block copolymer using a polymerization initiator having an amino group, by using an unsaturated monomer having an amino group as a raw material to be copolymerized ( Examples thereof include a method of modifying a hydrogenated copolymer with an amine.

  The amount of the urethane-based thermoplastic elastomer (A) in the thermoplastic elastomer resin composition is preferably 50 to 94 parts by weight, more preferably 50 to 90 parts by weight. Is particularly preferred. The amount of the olefinic thermoplastic elastomer (B) is preferably 5 to 45 parts by weight, more preferably 10 to 40 parts by weight. The compounding amount of the amine-modified styrenic thermoplastic elastomer (C) is preferably 2 to 30 parts by weight, and more preferably 5 to 30 parts by weight.

  If the amount of the urethane-based thermoplastic elastomer (A) is too small, the wear resistance, moist feeling, heat resistance and the like are inferior. On the other hand, if the amount is too large, the moldability becomes poor and the moist feeling is inferior. On the other hand, if the amount of the olefinic thermoplastic elastomer (B) is too small, the moldability is deteriorated. On the other hand, if the amount is too large, the wear resistance, moist feeling, heat resistance and the like are deteriorated. Further, if the amount of the amine-modified styrene thermoplastic elastomer (C) is too small or not blended, the mixing of the urethane thermoplastic elastomer (A) and the olefin thermoplastic elastomer (B) becomes uneven, and molding However, when it is too much, the cost becomes high. The amount of the amine-modified thermoplastic elastomer (C) is preferably blended according to the amount of the olefin-based thermoplastic elastomer (B). The compounding amount of the amine-modified thermoplastic elastomer (C) is preferably 5 parts by weight or more when the compounding amount of the olefin-based thermoplastic elastomer (B) is 10 parts by weight or more, and the compounding amount is 10 parts by weight. In the case of less than 1, it is preferable to mix | blend in the ratio of 1/5-1/2 with respect to the compounding quantity of the said olefin type thermoplastic elastomer (B).

Furthermore, the blending ratio (weight ratio) [(A) / (B)] of the urethane thermoplastic elastomer (A) and the olefin thermoplastic elastomer (B) is preferably 1.05 to 20.
When the blending ratio [(A) / (B)] of the urethane-based thermoplastic elastomer (A) and the olefin-based thermoplastic elastomer (B) is less than 1.05, the urethane-based thermoplastic elastomer (A) Since the ratio is low, the wear resistance and heat resistance become poor. On the other hand, when the blending ratio [(A) / (B)] exceeds 20, since the ratio of the urethane-based thermoplastic elastomer (A) is high, the moldability becomes inferior and the surface hardness becomes high. It becomes inferior to the feel (moist feeling) of the obtained skin material. The blending ratio [(A) / (B)] is more preferably 1.05 to 10, and particularly preferably 1.2 to 10.
The preferred surface hardness of the vehicle interior skin material of the present invention is A hardness (JIS K 6253-3) of A65 to A85, more preferably A70 to A80. When the blending ratio [(A) / (B)] exceeds 20, the A hardness exceeds the preferable range of the vehicle interior skin material. If the said mixture ratio [(A) / (B)] is 1.05-10, A hardness will be A70-A80 and it is more preferable.

  The thermoplastic elastomer resin composition used for the vehicle interior skin material of the present invention does not contain a plasticizer such as oil as an additive. Since a high-polarity urethane-based thermoplastic elastomer and a low-polarity oil-based plasticizer are incompatible, blending a plasticizer such as oil in a thermoplastic elastomer resin composition containing a urethane-based thermoplastic elastomer has the problem of bleeding. Arise. In the present invention, since a softening plasticizer such as oil is not contained, problems due to plastic bleeding, such as surface stickiness and white blurring, do not occur.

The method for producing the vehicle interior skin material is not particularly limited. For example, an example in which a sheet-like vehicle interior skin material is obtained by the T-die method will be described. In the T-die method, the thermoplastic resin composition is extruded into a sheet form from an extruder having a T-die at the tip, and subsequently passed through a metal cooling roller to obtain an interior skin material for a vehicle. Although the thickness of the vehicle interior skin material is set according to the vehicle interior material, 0.2 to 3 mm is given as an example.
The vehicle interior skin material is then shaped into a skin shape corresponding to the product by vacuum forming. In vacuum forming, the vehicle interior skin material is heated and vacuum sucked into the mold surface of the vacuum forming mold, and in that state, it is cooled and hardened to form. The mold surface of the vacuum forming mold is adapted to the skin shape of the vehicle interior material. When forming the surface shape according to the product by vacuum forming, the thickness of the vehicle interior skin material is preferably 0.3 to 1 mm.

  The vehicle interior skin material of the present invention is laminated and integrated on the surface of a resin member made of foam or non-foam to constitute a vehicle interior material. Laminate integration of vehicle interior skin material and resin member is performed by sticking using an adhesive or the like, or by injecting a foaming raw material such as urethane into a foaming mold in which the skin material is set, so that the foam is integrated with the skin material. There is a skin integral foam molding method to be molded, and it is not particularly limited.

  A thermoplastic elastomer resin composition having the following raw materials as shown in the tables of FIGS. 1 and 2 was used, and a twin-screw extruder (product name: KTX30, manufactured by Kobe Steel, kneading temperature 180 ° C., screw rotation speed 200 rpm) After the pellets were prepared, a sheet having a thickness of 0.6 mm and a width of 600 mm was obtained using a single-screw extruder having a T die (product name: SHT90-B-32DVg, manufactured by Hitachi Zosen, kneading temperature 180 ° C., screw rotation speed 150 rpm). The inner skin material for a vehicle of Examples 1 to 17 and Comparative Examples 2 to 8 was obtained by passing through a metal cooling roller. In Comparative Example 1, 750P-JP manufactured by Kyowa Leather Co. was used as the surface coating TPO skin material. The structure of 750P-JP is a three-layer skin material composed of surface coating: 10 μm / TPO: 0.8 mm / olefin resin foam: 2 mm.

TPU-1: Urethane thermoplastic elastomer (A), ester / hydrogenated MDI (non-yellowing isocyanate), product name: Elastollan (registered trademark) NY585, manufactured by BASF Corp. TPU-2: Urethane thermoplastic elastomer (A), ether / hydrogenated MDI (non-yellowing isocyanate), product name; Elastollan (registered trademark) NY90A, manufactured by BASF Corp. TPU-3: urethane-based thermoplastic elastomer, ester / MDI (aromatic isocyanate), Product name: Milactolan (registered trademark) E585, manufactured by Nippon Milactolan Co., Ltd. TPS-1: Amine-modified styrene thermoplastic elastomer (C), amine-modified SEBS, product name: Tuftec (registered trademark) MP10, manufactured by Asahi Kasei Co., Ltd. TPS- 2: Acid-modified styrene thermoplastic elastomer, acid-modified SEBS, product name Tuftec (registered trademark) MP1913, manufactured by Asahi Kasei Co., Ltd. TPO-1: olefinic thermoplastic elastomer (B), PE / 1-octene copolymer (ethylene / α-olefin block copolymer), product name; Infuse (Registered trademark) 9000, manufactured by DOW ・ TPO-2: Olefin-based thermoplastic elastomer (B), PP / EPDM mixture, product name; Miralastomer (registered trademark) 8030NH, manufactured by Mitsui Chemicals ・ Plasticizer: Paraffin-based, product Name: Diana Process Oil PW-380, manufactured by Idemitsu Kosan Co., Ltd.

  About an Example and a comparative example, the moldability, abrasion resistance, moist feeling, light resistance, bleed out, surface hardness, tensile strength, and heat resistance were evaluated as follows. The evaluation results are shown in FIGS.

  The formability was evaluated based on the degree of wrapping around the metal lip roll immediately after extrusion from the single-screw extruder for the vehicle interior skin material of each Example and each Comparative Example. “◎” when there is no wrapping of the vehicle interior skin material around the lip roll, “◯” when the winding is slight, “△” when the winding is clear, and “×” when there is very much winding. .

Wear resistance is measured based on JIS K 7204 (taper wear) by creating a test piece and measuring the weight loss (mg) after 1000 revolutions under the conditions of grinding wheel: H18, load: 4.9 N, rotational speed: 60 rpm. did. When the weight loss was less than 30 mg, “◎”, when it was 30 mg or more and less than 45 mg, “◯”, when it was 45 mg or more and less than 60 mg, “Δ”, and when it was 60 mg or more, “x”.
The test piece was prepared by using a thermoplastic elastomer resin composition composed of each of the examples and comparative examples shown in FIGS. 1 and 2 using a lab plast mill (product name: ACM-5LVT, manufactured by Toyo Seiki Co., Ltd.). The resulting kneaded product is kneaded at a temperature of 180 ° C. × 4 minutes × 30 rpm, and the resulting kneaded product is compressed at a pressure of 30 MPa by a press machine (product name: IMC-180C, manufactured by Imoto Seisakusho Co., Ltd.), whereby a flat plate of 200 mm × 200 mm × 2 mm thickness A test piece consisting of

  As for the moist feeling, 10 testers touched the vehicle interior skin material of each example and each comparative example, and the moist feeling is good: 5 points, normal: 3 points, bad: 1 point. For each comparative example, an average value is calculated. When the average value is 4.5 points or more, “」 ”, when it is 4 or more and less than 4.5,“ ◯ ”, when it is 3 or more and less than 4 points,“ △ ” “×” when less than 3.

For the light resistance, the test piece of each example and each comparative example is irradiated with a xenon lamp using a light resistance tester (product name: SC-700FP, manufactured by Suga Test Instruments Co., Ltd.) with an irradiance of 150 W / m ² (wavelength range: 300 to 400 nm). The ΔE after cumulative energy of 300 MJ / m ² (back panel temperature: 83 ± 3 ° C.) was measured with a color difference meter (product name: SM color computer SM-T, manufactured by Suga Test Instruments Co., Ltd.). When ΔE is less than 3, “◯”, when 3 or more and less than 6, “Δ”, and when 6 or more, “X”.

  The bleed-out is made by visually and touching the surface of the test piece with white blur and stickiness after the test piece of each example and each comparative example is stored in a thermostat at 80 ° C. for 2 hours. In the case where neither white blurring nor stickiness was found, “◯” was given, and in the case where there was at least one of white blurring or stickiness, “x” was given.

  For the surface hardness, the Shore A hardness was measured based on JIS K 6253-3 for the test pieces of each Example and each Comparative Example. The measurement was performed by stacking three test pieces having a thickness of 2 mm to a thickness of 6 mm, and the value after pressing for 15 seconds. When the measured value was A70 or more and less than A80, “◯”, when A65 or more and less than A70 or A80 or more and less than A85, “Δ”, and when less than A65 or A85 or more, “x”.

  The tensile strength of each of the test pieces of each Example and each Comparative Example was measured based on JIS K 6251 at a sample thickness of 2 mm (dumbbell shape No. 1) and a tensile speed of 200 mm / min. When the measurement result was 10 MPa or more, “◯”, when it was 8 MPa or more and less than 10 MPa, “Δ”, and when it was less than 8 MPa, “x” was assigned.

  The heat resistance of each test piece of each example and each comparative example was determined based on JIS K 6251 (retention rate of tensile strength after heat aging) as a heat aging condition of 110 ° C. × 200 hours before the heat aging test. The strength and the tensile strength after the heat aging test were measured, and the retention rate of the tensile strength after the heat aging was calculated. When the calculation result (tensile strength retention) is 80% or more, “◯” is indicated, when “60” or more and less than 80%, “Δ”, and when it is less than 60%, “X”

Examples 1-6 use TPU-1, TPO-1, and TPS-1, fix the amount of TPS-1 to 5 parts by weight, and the amount of TPU-1 between 50 parts by weight and 85 parts by weight. And the amount of TPO-1 was changed between 45 parts by weight and 10 parts by weight, and the blending ratio of TPU / TPO was 1.11 to 8.5. In each of Examples 1 to 6, the evaluation was “◯” or “◎” with respect to moldability, wear resistance, moist feeling, light resistance and bleed out, and the surface hardness (A hardness) was 72 to 78. Is “◯”, which is a preferable hardness, and the tensile strength is 10.1 to 30.3 MPa, both “◯”, and the heat resistance (tensile strength retention) is 90 to 100%. It was “○”.
In particular, in Examples 2 to 6 in which the blending ratio of TPU / TPO was 1.38 to 8.5, the evaluation of moldability, wear resistance and moist feeling were all “◎”, and were particularly good. .

  Examples 7 to 9 use TPU-1, TPO-1 and TPS-1, and change the amount of TPU-1 between 90 parts by weight to 92.5 parts by weight, and the amount of TPO-1 to 2 In this example, the blending ratio of TPU / TPO is set to 11.25 to 18.5 by changing the weight ratio between 2.5 parts by weight. In each of Examples 7 to 9, the evaluation was “◯” or “◎” for the moldability, wear resistance, moist feeling, light resistance and bleed out, and the tensile strength was 38.4 to 40.6 MPa. All were “◯”, and the heat resistance (tensile strength retention) was 100%, and both were “◯”. The surface hardness (A hardness) was 80 to 82 and was “Δ”.

  Example 3 and Examples 10-12 use TPU-1, TPO-1 and TPS-1, and fix TPU-1 to 60 parts by weight, while TPO-1 is 35 parts by weight to 10 parts by weight. In this example, TPS-1 was changed between 5 parts by weight and 30 parts by weight, and the blending ratio of TPU / TPO was 1.71-6. In each of Examples 3 and 10 to 12, the evaluation was “◯” or “◎” with respect to moldability, wear resistance, moist feeling, light resistance and bleed out, and the surface hardness (A hardness) was 73. -74 and all are "O", which is a preferable hardness, and the tensile strength is 10.5 to 13.5 MPa, both are "O", and the heat resistance (tensile strength retention) is 100%. Both were “◯”.

  In Example 13, 60 parts by weight of TPU-1 in Example 3 was changed to 30 parts by weight of TPU-1 and 30 parts by weight of TPU-2. In Example 13, the evaluation of formability, abrasion resistance, and moist feeling was all “◎”, and as in Example 3, it was particularly good.

  Example 14 is an example in which 60 parts by weight of TPU-2 was used instead of 60 parts by weight of TPU-1 in Example 3. In Example 14, the evaluation of formability, wear resistance, and moist feeling was all “◎”, and as in Example 3, it was particularly good.

  In Examples 15 to 17, instead of 35 parts by weight of TPO-1 in Example 3, a combination of 20 parts by weight of TPO-1 and 15 parts by weight of TPO-2 (Example 15), TPO-1 5 parts by weight and 30 parts by weight of TPO-2 (Example 16), and 35 parts by weight of TPO-2 (Example 17). In each of Examples 15 to 17, as in Example 3, the evaluation was “◯” or “◎” for formability, wear resistance, moist feeling, light resistance and bleed out, and surface hardness (A (Hardness) is 74 and all are “◯”, which is a preferable hardness, and the tensile strength is 10.6 to 11.5 MPa, both are “O”, and the heat resistance (tensile strength retention) is 95. % And both were “◯”.

  Comparative Example 1 is an example in which the surface of the TPO sheet was coated, and the evaluation of abrasion resistance and moist feeling was “x”, and the tensile strength was “Δ”.

  Comparative Example 2 is an example in which TPU-1 is 45 parts by weight, TPO-1 is 50 parts by weight, TPS-1 is 5 parts by weight, and the blending ratio of TPU / TPO is 0.9. X, moist feeling was “x”, tensile strength was “x”, and heat resistance (tensile strength retention) was “Δ”.

  Comparative Example 3 is an example in which TPU-1 is 47.5 parts by weight, TPO-1 is 47.5 parts by weight, TPS-1 is 5 parts by weight, and the TPU / TPO blending ratio is 1. “×”, moist feeling “Δ”, tensile strength “×”, and heat resistance (tensile strength retention) “Δ”.

  Comparative Example 4 is an example in which TPU-1 is 95 parts by weight, TPO-1 is 4 parts by weight, TPS-1 is 1 part by weight, and the TPU / TPO blending ratio is 23.75. The moist feeling was “Δ” and the surface hardness was “x”.

  Comparative Example 5 is an example in which TPU-1 is 60 parts by weight, TPO-1 is 40 parts by weight, TPS-1 is 0 part by weight, and the TPU / TPO blending ratio is 1.5. The abrasion resistance was “Δ”, the moist feeling was [Δ], the tensile strength was “x”, and the heat resistance (tensile strength retention) was “Δ”. When TPS-1 was not blended, not only was the moldability inferior, but TPU-1 and TPO-1 were not uniformly mixed, resulting in poor wear resistance, moist feeling, and tensile strength.

  Comparative Example 6 is an example in which TPU-3 is 60 parts by weight, TPO-1 is 35 parts by weight, TPS-1 is 5 parts by weight, and the TPU / TPO blending ratio is 1.71, and the light resistance is “x”. Met. TPU-3 was inferior in light resistance because the isocyanate component was not a non-yellowing isocyanate but an aromatic isocyanate.

  Comparative Example 7 is an example in which TPU-1 is 60 parts by weight, TPO-1 is 35 parts by weight, TPS-2 is 5 parts by weight, and the TPU / TPO blending ratio is 1.71, and the moldability is “x”. The tensile strength was “Δ”. TPS-2 is acid-modified SEBS, and has higher adhesiveness to metal than TPS-1 which is amine-modified SEBS, resulting in very poor moldability.

  Comparative Example 8 is an example in which TPU-1 is 60 parts by weight, TPO-1 is 25 parts by weight, TPS-2 is 5 parts by weight, a plasticizer is 10 parts by weight, and the TPU / TPO blending ratio is 2.4. The moldability was “Δ”, the bleed out was “x”, and the tensile strength was “Δ”. By blending the plasticizer, the adhesion to the metal was lowered, and although improved compared to Comparative Example 7, the moldability was inferior. Moreover, since the compatibility of a plasticizer and TPU-1 was bad, both white blurring and stickiness were confirmed, and it was inferior to bleed-out.

  As described above, the vehicle interior skin material of the embodiment of the present invention has good wear resistance without coating the surface, has good light resistance and heat resistance, and further adheres to metal. It is low in nature.

Claims (3)

A vehicle interior skin material obtained from a thermoplastic elastomer resin composition,
The thermoplastic elastomer resin composition is
50 to 94 parts by weight of the urethane-based thermoplastic elastomer (A),
An olefinic thermoplastic elastomer (B);
An amine-modified styrenic thermoplastic elastomer (C);
Including
The isocyanate component of the urethane-based thermoplastic elastomer (A) is a non-yellowing isocyanate,
The vehicle interior skin material, wherein a blending ratio [(A) / (B)] of the urethane-based thermoplastic elastomer (A) and the olefin-based thermoplastic elastomer (B) is 1.05-20. .   The vehicle interior skin material according to claim 1, wherein the non-yellowing isocyanate is an alicyclic isocyanate.   The vehicle interior skin material according to claim 1 or 2, wherein the amine-modified styrene thermoplastic elastomer (C) is an amine-modified hydrogenated styrene thermoplastic elastomer.

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