JP5386468B2 - Thermoplastic polyolefin resin skin material - Google Patents

Description

  The present invention relates to a thermoplastic polyolefin resin skin material used for automobile interior materials, home appliance parts, etc., and in particular, it is excellent in lubricity, surface feel, scratch resistance, abrasion resistance, chemical resistance, and uniform. The present invention relates to a thermoplastic polyolefin resin skin material capable of forming a smooth matte film.

  Vehicle interior materials (instrument panels, door trims, etc.) and household electrical appliance parts are strongly desired to be recycled in order to reduce waste materials after use as much as possible in view of recent dust problems and environmental problems. From this viewpoint, in recent years, thermoplastic polyolefins such as polypropylene (PP), ABS resin, AS resin, polyolefin-based thermoplastic elastomer (TPO) and the like have been used as vehicle interior materials and skin materials for home appliance parts. However, these thermoplastic polyolefins are inferior in surface adhesion, scratch resistance, abrasion resistance, and chemical resistance to conventional vinyl chloride resins and the like, and therefore are applied for the purpose of improving their performance. There is a need. In addition, in order to give a high-class feeling, it is necessary to consider not only the design property but also the anti-glare property for the driver in the case of automobile interior materials. For this reason, the function provision for making it a better skin material is performed by giving various coatings to a thermoplastic polyolefin base material, and forming a topcoat layer.

  The paints used in this case include the following, and various studies have been made. For example, a chlorinated polypropylene-modified acrylic resin that has good adhesion to polyolefin resins such as PP resin and TPO resin is used as a binder resin, and inorganic extender pigments (silica, talc), acrylic resin particles, etc. There have been proposed methods of using a paint containing a matting agent, or applying a paint having a polyester resin or a polyurethane resin on a chlorinated polypropylene primer.

  In recent years, global warming, which is thought to be caused by ever-increasing carbon dioxide emissions, has become a global problem as an environmental issue separate from recycling. In particular, there is a long-awaited technology that can use carbon dioxide as a production raw material. Furthermore, from the viewpoint of the exhaustible petrochemical resource (oil) problem, the shift to renewable resources such as biomass and methane has become a global trend.

  Under these circumstances, recently, in the field of thermoplastic polyolefin resin skin materials, more manufacturers are actively working on environmental measures, and there is a movement to configure products using materials with excellent environmental conservation. is there. For example, studies that do not select a specific solvent (such as toluene) from the organic solvents used in the paint, and studies that suppress VOC (volatile organic compound) emissions as much as possible by using water-based resins instead of organic solvents However, it is still insufficient from the aspect of realizing the current global environmental conservation (Patent Documents 1 to 3).

  Here, as seen in Non-Patent Documents 1 and 2, polyhydroxy polyurethane resin using carbon dioxide as a production raw material has been known for a long time, but its application development has not progressed. This is because the above-mentioned resins that have been conventionally known are clearly inferior to conventional polyurethane resins of petrochemical polymers (petrolithic plastics) in terms of their characteristics (see Patent Documents 4 and 5). ).

  This polyhydroxy polyurethane resin has been reviewed again against the background that the reduction of carbon dioxide emissions has become a global issue in recent years. That is, carbon dioxide, which is a raw material of the five-membered cyclic carbonate compound constituting this resin, is a readily available and sustainable carbon resource, and a plastic that can use carbon dioxide as a carbon raw material instead of petroleum resources, This is because it can be an effective means for solving the above-mentioned problems such as global warming and resource depletion.

JP 2006-307015 A JP 2004-51901 A JP 2006-176615 A US Pat. No. 3,072,613 JP 2000-319504 A

N. Kihara, T. Endo, J. Org. Chem., 1993, 58, 6198 N. Kihara, T. Endo, J. Polymer Sci., Part A Polmer Chem., 1993, 31 (11), 2765

Under such circumstances, the surface of the thermoplastic polyolefin resin used for the vehicle interior materials and home appliance parts described above is further required to have surface scratch resistance, abrasion resistance and chemical resistance, and further necessary. Accordingly, there is a demand for the development of environmentally friendly products that are excellent in uniform matting effect and have environmental conservation on a global scale.
Accordingly, the object of the present invention is not only a skin material made of a thermoplastic polyolefin resin having the above-mentioned excellent properties, but also an excellent environmentally friendly product that can be obtained using carbon dioxide as a carbon raw material. The object is to provide a polyolefin resin skin material.

  The above object is achieved by the present invention described below. That is, the present invention has either a thermoplastic polyolefin resin sheet, a topcoat layer formed directly on the sheet, or a topcoat layer formed via a primer layer formed on the sheet. And the topcoat layer is composed of a polysiloxane-modified polyhydroxypolyurethane resin derived from a reaction between a 5-membered cyclic carbonate compound and an amine-modified polysiloxane compound as a main component. Provide skin material.

  According to the present invention described above, by using a specific polysiloxane-modified polyhydroxypolyurethane resin as a material for forming the topcoat layer constituting the thermoplastic polyolefin resin skin material, lubricity, surface feel, scratch resistance, scratch resistance, Products with excellent wear and chemical resistance and, if necessary, a uniform matte effect are provided. At the same time, it is an environmentally friendly product that can contribute to the reduction of carbon dioxide, which is regarded as a global problem as a greenhouse gas, because carbon dioxide is incorporated into the resin and fixed. A skin material made of thermoplastic polyolefin resin is provided.

The infrared absorption spectrum of an epoxy compound (Epicoat 828). The infrared absorption spectrum of a 5-membered cyclic carbonate compound. GPC elution curve of a 5-membered cyclic carbonate compound (mobile phase: THF, column: TSK-Gel GMHXL + G2000HXL + G3000HXL, detector: IR).

Next, the present invention will be described in more detail with reference to preferred embodiments.
The skin material made of the thermoplastic polyolefin resin of the present invention has a top coat layer formed by coating directly on the thermoplastic polyolefin resin sheet, or a primer layer coated on the resin sheet and the primer layer And a top coat layer formed by coating. A polysiloxane-modified polyhydroxypolyurethane resin derived from the reaction of a 5-membered cyclic carbonate compound and an amine-modified polysiloxane compound (hereinafter simply referred to as “used in the present invention” as the polymer compound constituting the top coat layer). Resin ”or“ resin of the present invention ”).

  The 5-membered cyclic carbonate compound for forming the polysiloxane-modified polyhydroxypolyurethane resin used in the present invention is produced, for example, by reacting an epoxy compound and carbon dioxide as shown by the following [Formula-A]. can do. More particularly, the epoxy compound is reacted with carbon dioxide in the presence or absence of an organic solvent and in the presence of a catalyst at a temperature of 40 ° C. to 150 ° C. at normal pressure or slightly elevated pressure for 10-20 hours. It can be obtained by reacting.

  As an epoxy compound used by this invention, the following compounds can be illustrated, for example.

  The epoxy compounds listed here are preferred compounds used in the present invention, and the present invention is not limited to these exemplified compounds. Accordingly, not only the compounds exemplified above, but also any other compounds that are currently commercially available and can be easily obtained from the market can be used in the present invention.

  The 5-membered cyclic carbonate compound used in the present invention can be obtained by the reaction of the above epoxy compound and carbon dioxide. Examples of the catalyst that can be used in this reaction include a base catalyst and a Lewis acid catalyst. Examples of the base catalyst include tertiary amines such as triethylamine and tributylamine, cyclic amines such as diazabicycloundecene, diazabicyclooctane, and pyridine, lithium chloride, lithium bromide, lithium fluoride, and sodium chloride. Alkaline metal salts, alkaline earth metal salts such as calcium chloride, quaternary ammonium salts such as tetrabutylammonium chloride, tetraethylammonium bromide, benzyltrimethylammonium chloride, carbonates such as potassium carbonate and sodium carbonate, zinc acetate, lead acetate, Examples thereof include metal acetates such as copper acetate and iron acetate, metal oxides such as calcium oxide, magnesium oxide and zinc oxide, and phosphonium salts such as tetrabutylphosphonium chloride.

  Examples of the Lewis acid catalyst include tin compounds such as tetrabutyltin, dibutyltin dilaurate, dibutyltin diacetate, and dibutyltin octoate.

  The amount of these catalysts used may be 0.1 to 100 parts by weight, preferably 0.3 to 20 parts by weight, per 50 parts by weight of the epoxy compound. If the amount used is less than 0.1 parts by mass, the effect as a catalyst is small, and if it is too much, various performances of the final resin may be deteriorated. Therefore, when the residual catalyst causes a serious performance deterioration, the residual catalyst may be removed by washing with pure water.

  Examples of the organic solvent that can be used in the reaction between the epoxy compound and carbon dioxide include dimethylformamide, dimethylsulfoxide, dimethylacetamide, N-methylpyrrolidone, N-ethylpyrrolidone, and tetrahydrofuran. These organic solvents and other poor solvents such as methyl ethyl ketone, xylene, toluene, tetrahydrofuran, diethyl ether, and cyclohexanone may be used in a mixed system.

  As shown in the following [Formula-B], the resin used in the present invention is, for example, a 5-membered cyclic carbonate compound obtained by the above reaction and an amine-modified polysiloxane compound in the presence of an organic solvent. It can obtain by making it react at the temperature of 20 to 150 degreeC.

  Examples of the amine-modified polysiloxane compound used in the above reaction include the following compounds. The lower alkylene group in the following formula means one having 1 to 6 carbon atoms, more preferably 1 to 4 carbon atoms.

  The amine-modified polysiloxane compounds listed here are preferred compounds used in the present invention, and the present invention is not limited to these exemplified compounds. Accordingly, not only the above-exemplified compounds but also any other compounds that are currently commercially available and can be easily obtained from the market can be used in the present invention.

  The polysiloxane-modified polyhydroxypolyurethane resin used in the present invention obtained as described above is such that the proportion of the polysiloxane segment in the resin is 1 to 75% by mass with respect to the resin molecule content. It is preferable that If it is less than 1% by mass, the function associated with the surface energy based on the polysiloxane segment is insufficiently expressed, which is not preferable. On the other hand, when it exceeds 75% by mass, the performance of the polyhydroxyurethane resin such as mechanical strength and abrasion resistance becomes insufficient, which is not preferable. More preferably, it is 2 to 60% by mass, and further preferably 5 to 30% by mass.

  The polysiloxane-modified polyhydroxypolyurethane resin used in the present invention preferably has a number average molecular weight (standard polystyrene conversion value measured by GPC) of about 2,000 to 100,000. Furthermore, it is more preferable that it is a thing of about 5,000-70,000.

  In the present invention, when the topcoat layer is formed using the polysiloxane-modified polyhydroxypolyurethane resin as described above, the anti-glare property and the like are taken into consideration depending on the use in the resin composition to be used. A matting agent may be blended. Moreover, as a matting agent, the substance which consists of 1 type, or 2 or more types of combinations chosen from organic type fine powder or inorganic type fine powder can be used. The organic fine powder used in this case is not particularly limited. For example, acrylic resin particles, styrene resin particles, styrene-acrylic resin particles, phenol resin particles, melamine resin particles, acrylic-polyurethane resin particles, Polyurethane resin particles, polyester resin particles, nylon resin particles, silicone resin particles, polyethylene resin particles, and the like can be used. These powders preferably have an average particle diameter in the range of 0.1 to 10 μm. Moreover, since the matte property of the coating film to be formed is particularly excellent, a spherical or substantially spherical shape is practically preferable.

  In addition, inorganic fine powders include talc, mica, calcium carbonate, barium sulfate, magnesium carbonate, clay, alumina, silica, carbon fiber, glass fiber, metal fiber, carbon black, titanium oxide, molybdenum, magnesium hydroxide, bentonite. And graphite. As these powders, particles having an average particle diameter of 10 μm or less are in accordance with the object of the present invention, but are preferably as small as possible.

  The amount of the matting agent used as described above is 1 to 150 parts by mass, preferably 3 to 100 parts by mass with respect to 100 parts by mass of the polysiloxane-modified polyhydroxypolyurethane resin. If it is less than 1 part by mass, the matting effect is not sufficient, and if it exceeds 150 parts by mass, the mechanical properties of the coating film are greatly reduced, which is not preferable.

  The polysiloxane-modified polyhydroxypolyurethane resin used in the present invention is derived from the reaction between the 5-membered cyclic carbonate compound and the amine-modified polysiloxane compound, and a hydroxyl group is generated during this reaction. The generated hydroxyl group brings about further improvement in the performance of the thermoplastic polyolefin resin skin material of the present invention having a topcoat layer formed by using the above resin. That is, since the hydroxyl group has hydrophilicity, the hydroxyl group improves the adhesion of the topcoat layer to the thermoplastic polyolefin resin sheet, and also obtains an antistatic effect that could not be achieved with conventional products. Can do. In addition, if a reaction between a hydroxyl group in the structure of the resin and a crosslinking agent added to the resin is used, in the surface product made of thermoplastic polyolefin resin, further surface scratch resistance, abrasion resistance, The chemical resistance can be improved.

  The hydroxyl value of the polysiloxane-modified polyhydroxypolyurethane resin used in the present invention is preferably 20 to 300 mgKOH / g. When the hydroxyl group content is less than the above range, the effect of reducing carbon dioxide is insufficient, while when it exceeds the above range, various physical properties as a polymer compound are insufficient.

  In the present invention, a composition comprising a polysiloxane-modified hydroxypolyurethane resin as a main component, and a composition containing a matting agent depending on the application (hereinafter abbreviated as “resin composition”) are used as they are. A film can be formed on a thermoplastic polyolefin resin sheet to provide a topcoat layer. Furthermore, a crosslinked film can also be formed by including a crosslinking agent in the resin composition. As the crosslinking agent that can be used in this case, any crosslinking agent that reacts with a hydroxyl group in the resin structure can be used. For example, an alkyl titanate compound and a polyisocyanate compound may be mentioned, but any known crosslinking agent conventionally used for crosslinking polyurethane resins is not particularly limited. Examples include adducts of polyisocyanates having the following structural formula and other compounds.

  In addition to the polysiloxane-modified polyhydroxypolyurethane resin, the resin composition used in the present invention is different from the resin in order to improve sprayability and coating suitability for the thermoplastic polyolefin resin and film formability. May be included. As other resin, conventionally well-known various binder resins can be mixed and used. The binder resin is preferably one that can chemically react with the above-mentioned polyisocyanate adduct and other crosslinking agents, but those having no reactivity can also be used in the present invention.

  As these binder resins, binder resins conventionally used for the surface of thermoplastic polyolefin resins can be used, and are not particularly limited. For example, acrylic resin, polyurethane resin, polyester resin, polybutadiene resin, silicone resin, melamine resin, phenol resin, polyvinyl chloride resin, cellulose resin, alkyd resin, modified cellulose resin, fluorine resin, polyvinyl butyral resin, epoxy resin, polyamide resin Etc. can be used. Moreover, when using the resin composition which uses these binder resin together, the usage-amount is 5-90 mass parts with respect to 100 mass parts of polysiloxane modified polyhydroxy polyurethane resins characterizing this invention, More preferably, it is 10 It is good to use in the range of about ~ 60 parts by mass.

  In addition, the resin composition used in the present invention may contain various coating additives such as a coating surface adjusting agent, a fluidity adjusting agent, an ultraviolet absorber, a dispersing agent, and an anti-settling agent, if necessary. Also good.

  Moreover, the thermoplastic polyolefin resin sheet which comprises the skin material of this invention is although it does not specifically limit, For example, what consists of the material listed below can be used. For example, low density to high density polyethylene (LDPE, LLDPE, HDPE, etc.), polypropylene, polypropylene such as propylene-ethylene copolymer, ethylene-propylene rubber (EPR), ethylene-butene rubber (EBR), ethylene-propylene-di What consists of at least 1 sort (s) of resin chosen from the group which consists of thermoplastic polyolefin resin, such as an enter polymer (EDPM), can be used. Among these, in order to have excellent mechanical strength and good flexibility and elasticity, those made of polypropylene resin and polyolefin-based thermoplastic elastomer are preferable.

  Since the surface of the thermoplastic polyolefin resin constituting the sheet is inactive, it is often inferior in adhesion to a coated product on the surface. For this reason, it is preferable to form the topcoat layer by directly applying the resin composition described above after physically or chemically activating the surface by corona discharge treatment or the like. Also, after applying a chlorinated polyolefin resin or polyester resin and a polyisocyanate compound, or a polyurethane resin and a polyisocyanate compound to form a primer layer, the resin composition described above is applied, It is preferable to form a topcoat layer.

  The above-mentioned resin composition has a thickness of 3 after drying by a known coating method such as brush coating, spraying, roll coating, gravure, or dipping, directly on the thermoplastic polyolefin resin sheet or on the primer layer as described above. A film can be formed by applying to about 20 μm and heat-treating at a temperature of about 50-120 ° C. after drying. The sheet-shaped thermoplastic polyolefin resin skin material of the present invention formed as described above is processed into a predetermined shape by vacuum forming, for example, as a vehicle interior material or a home appliance part.

  The thermoplastic polyolefin resin skin material of the present invention uses the polysiloxane-modified polyhydroxypolyurethane resin of the present invention as the material for forming the topcoat layer, so that the surface is slippery, surface feel, scratch resistance, It is excellent in wear resistance and chemical resistance, and also in a uniform matte effect. Along with this, the hydroxyl group of the polysiloxane-modified polyhydroxypolyurethane resin used to form the topcoat layer interacts strongly with the substrate sheet at the interface, resulting in excellent adhesion to the substrate, flexibility, and antistatic properties. The excellent performance that the effect is imparted can be obtained, and the performance of the thermoplastic polyolefin resin skin material can be improved. In addition, since the 5-membered cyclic carbonate compound used for the synthesis of the resin used in the present invention can use carbon dioxide as a raw material for production and can fix carbon dioxide in the resin, it causes global warming. Therefore, it is possible to provide an outer cover material made of a thermoplastic polyolefin resin, which is useful from the viewpoint of reducing carbon dioxide, and which is an environmentally friendly material product that cannot be achieved by conventional products.

  Next, the present invention will be described in more detail with reference to specific production examples, polymerization examples, examples and comparative examples, but the present invention is not limited to these examples. In the following examples, “part” and “%” are based on mass unless otherwise specified.

<Production Example 1> (Production of 5-membered cyclic carbonate compound)
In a reaction vessel equipped with a stirrer, a thermometer, a gas introduction tube and a reflux condenser, 100 parts of a divalent epoxy compound represented by the following formula A, 100 parts of N-methylpyrrolidone and 1.5 parts of sodium iodide are added. It was dissolved uniformly. Then, carbon dioxide gas was heated and stirred at 80 ° C. for 30 hours while bubbling carbon dioxide gas at a rate of 0.5 liter / min. The divalent epoxy compound used above was Epicoat 828 (epoxy equivalent 187 g / mol) manufactured by Japan Epoxy Resin Co., Ltd., and its infrared absorption spectrum was shown in FIG.

  After completion of the reaction, the obtained solution was gradually added to 300 parts of n-hexane with high-speed stirring at 300 rpm, and the resulting powdery product was filtered through a filter, further washed with methanol, and N-methylpyrrolidone and Sodium iodide was removed. Then, the powder was dried in a drier to obtain 118 parts (yield 95%) of a white powder 5-membered cyclic carbonate compound (1-A).

In the infrared absorption spectrum (Horiba FT-720) of the obtained product (1-A), as shown in FIG. 2, the peak derived from the epoxy group near 910 cm ⁻¹ almost disappears in the product, Absorption of a carbonyl group of a cyclic carbonate group not present in the raw material was confirmed near 1,800 cm ⁻¹ . Moreover, the number average molecular weight of the product was 414 (polystyrene conversion, Tosoh; GPC-8220) as shown in FIG. In the obtained 5-membered cyclic carbonate compound (1-A), 19% of carbon dioxide was immobilized.

<Production Example 2> (Production of 5-membered cyclic carbonate compound)
In this production example, instead of the bivalent epoxy compound A used in the previous production example 1, a divalent epoxy compound B represented by the following formula B (manufactured by Tohto Kasei Co., Ltd., YDF-170; epoxy equivalent 172 g / mol) ) Was used. And it was made to react like manufacture example 1 except this, and 121 parts (yield 96%) of 5-membered cyclic carbonate compound (1-B) of white powder were obtained. The obtained product (1-B) was confirmed by infrared absorption spectrum, GPC and NMR in the same manner as in Production Example 1. In the obtained 5-membered cyclic carbonate compound (1-B), 20.3% of carbon dioxide was immobilized.

<Production Example 3> (Production of 5-membered cyclic carbonate compound)
In this production example, instead of the divalent epoxy compound A used in the previous production example 1, a divalent epoxy compound C represented by the following formula C (manufactured by Nagase ChemteX Corporation, EX-212; epoxy equivalent 151 g / mol) was used. Other than this, the reaction was conducted in the same manner as in Production Example 1 to obtain 111 parts (yield 86%) of a colorless and transparent liquid 5-membered cyclic carbonate compound (1-C). The obtained product was confirmed by infrared absorption spectrum, GPC, and NMR as in the case of Production Example 1. In the obtained 5-membered cyclic carbonate compound (1-C), 22.5% of carbon dioxide was immobilized.

<Polymerization Examples 1-3> (Production of polysiloxane-modified polyhydroxypolyurethane resin)
Using the 5-membered cyclic carbonate compounds obtained in Production Examples 1 to 3, polysiloxane-modified polyhydroxypolyurethane resins used in the examples were synthesized by the following procedure. A reaction vessel equipped with a stirrer, a thermometer, a gas introduction pipe and a reflux condenser is replaced with nitrogen, and the 5-membered cyclic carbonate compound obtained in Production Examples 1 to 3 is added thereto, and the solid content becomes 35%. Thus, N-methylpyrrolidone was added and dissolved uniformly. Next, a predetermined equivalent of the amine-modified polysiloxane compound shown in Table 1 was added, and the mixture was stirred at a temperature of 90 ° C. for 10 hours, and reacted until no amine-modified polysiloxane compound could be confirmed. The properties of the obtained three types of polysiloxane-modified polyhydroxypolyurethane resins were as shown in Table 1.

<Comparative polymerization example 1> (Production of polyhydroxypolyurethane resin)
The polyhydroxy polyurethane resin used in the comparative example was synthesized as follows. A reaction vessel equipped with a stirrer, a thermometer, a gas introduction pipe and a reflux condenser was replaced with nitrogen, and the 5-membered cyclic carbonate compound obtained in Production Example 1 was further replaced with N- so that the solid content was 35%. Methylpyrrolidone was added and dissolved uniformly. Next, a predetermined equivalent of hexamethylenediamine was added and stirred for 10 hours at a temperature of 90 ° C. until the amine compound could not be confirmed. The properties of the obtained polyhydroxy polyurethane resin were as shown in Table 1.

<Comparative polymerization example 2> (Production of polyester urethane resin)
As described below, as Comparative Polymerization Example 2, a conventional polyurethane resin was synthesized from the polyester, diol, and diamine used in the Comparative Example. A reaction vessel equipped with a stirrer, a thermometer, a gas introduction pipe and a reflux condenser was replaced with nitrogen, and 150 parts of polybutylene adipate having an average molecular weight of about 2,000 and 15 parts of 1,4-butanediol were mixed with 200 parts. Dissolved in a mixed organic solvent consisting of methyl ethyl ketone and 50 parts dimethylformamide. Thereafter, 62 parts of water-added MDI dissolved in 171 parts of dimethylformamide was gradually added dropwise while stirring well at 60 ° C., and reacted at 80 ° C. for 6 hours after completion of the addition.
This solution had a viscosity of 3.2 MPa · s (25 ° C.) at a solid content of 35%. The film obtained from this solution had a breaking strength of 45 MPa, a breaking elongation of 480%, and a thermal softening temperature of 110 ° C.

<Comparative polymerization example 3> (Production of polysiloxane-modified polyurethane resin)
The polysiloxane modified polyurethane resin used in the comparative example was synthesized from diol and diamine as follows. 150 parts of polydimethylsiloxanediol represented by the following formula (D) and having an average molecular weight of about 3,200 and 10 parts of 1,4-butanediol are mixed organics consisting of 200 parts of methyl ethyl ketone and 50 parts of dimethylformamide. A solvent was added, and 40 parts of water-added MDI dissolved in 120 parts of dimethylformamide was gradually added dropwise. After completion of the addition, the mixture was reacted at 80 ° C. for 6 hours. This solution has a solid content of 35% and a viscosity of 1.6 MPa · s (25 ° C.). The film obtained from this solution has a breaking strength of 21 MPa and a breaking elongation of 250%, and the thermal softening temperature is 135 ° C. Met.

<Examples 1-6, Comparative Examples 1-6>
[Manufacture of skin material made of thermoplastic polyolefin resin]
Using the resins of Polymerization Examples 1 to 3 and Comparative Polymerization Examples 1 to 3, the coating materials for the skin (resin compositions) having the formulations shown in Tables 2 and 3 were respectively prepared and used as follows. A thermoplastic polyolefin resin skin material was prepared and evaluated by the following method.

  After a corona discharge treatment and drying a chlorinated polypropylene (Super Clon; manufactured by Nippon Paper Industries Co., Ltd.) with a 120 mesh gravure roll on a thermoplastic polyolefin base sheet whose surface has been activated to a wetting index of 45 dyn / cm The primer layer was applied to a thickness of 3 μm and dried at 100 ° C. for 2 minutes to form a primer layer. On this coating film, each of the coating materials for the skin prepared by the formulation shown in Table 2 and Table 3 was applied with a 120 mesh gravure roll so that the thickness after drying was 5 μm, and at 100 ° C. Each skin material (sheet) was obtained by drying for 2 minutes and aging at 80 ° C. for 24 hours. Subsequently, it shape | molded with the convex drawing type | mold vacuum forming machine with a surface temperature of 160 degreeC, and obtained the molded article which consists of each skin material.

[Evaluation]
The molded products made of each skin material obtained above have moldability, gloss (glossiness), coefficient of friction, adhesion, scratch resistance, oil resistance, chemical resistance, surface wear resistance, and environmental compatibility. Evaluation was performed by the following methods and criteria. In particular, the surface (topcoat layer) of the molded product made of each sheet was evaluated. The results are shown in Tables 2 and 3.

(Formability)
The sheet surface after vacuum forming was visually observed and evaluated.
○: Good (no molding cracking or whitening phenomenon)
X: Defect (either molding cracking or whitening phenomenon is recognized)

(Gross value)
The gloss of the sheet surface after each vacuum forming is measured with a gloss meter according to JIS K5600, and a gloss value of 1.2 or less (standard value required by the industry) is accepted.

(Coefficient of friction)
The coefficient of friction of the sheet surface after vacuum forming was measured with a surface property tester (manufactured by Shinto Kagaku) and evaluated. The lower the coefficient of friction, the less noise (squeaking noise) caused by rubbing between the surfaces of the car interior material.

(Adhesiveness)
A peeling test using a grid cellophane tape on the surface of the sheet after vacuum forming was performed, and the following criteria were evaluated.
○: Good (no peeling part on the coated surface)
×: Defect (there is a peeled part on the coated surface)

(Abrasion resistance)
The surface of the sheet after vacuum forming was rubbed with nails, and whether or not scars or whitening occurred was visually evaluated and evaluated according to the following criteria.
○: Good (difficult to determine claw scratches / whitening on the coated surface)
×: Defect (Nail scratches and whitening marks on the coated surface can be clearly identified)

(Oil resistance)
Beef oil (Nacalai Tech Co., Ltd.) is applied to a 2 cm radius on the surface of the vacuum-formed sheet, left for 5 days in an 80 ° C. atmosphere, then removed, and peeled with a grid cellophane tape on the coated surface of cow oil. And evaluated.

(chemical resistance)
Ethanol was dropped on the surface of the sheet after vacuum forming, and a solvent was added dropwise to maintain a wet state at all times, followed by wiping after 1 hour. The wiped portion was visually observed and evaluated according to the following criteria.
○: No dripping traces are observed on the coated surface. Δ: Slight dropping traces are observed but not noticeable.

(Surface wear resistance)
The surface of the sheet after vacuum forming was evaluated by the following criteria by measuring the number of times until the No. 6 canvas was scratched with a load of 1 kgf using a flat abrasion tester.
○: 5000 times or more Δ; 2000 times or less to less than 5000 times ×; less than 2000 times

(Environmental compatibility)
It was judged as ○ depending on whether carbon dioxide was immobilized in the resin used for forming the top coat layer of the skin material.

  According to the present invention, by using a composition containing a specific polysiloxane-modified polyhydroxypolyurethane resin for the topcoat layer of a thermoplastic polyolefin resin sheet, a molded product obtained from the sheet-like skin material is contained in the resin. The polysiloxane segment is oriented on the surface, and is excellent in lubricity, surface feel, scratch resistance, abrasion resistance and chemical resistance, and further in a uniform matte effect. At the same time, the hydroxyl group of the polysiloxane-modified polyhydroxypolyurethane resin forming the topcoat layer interacts strongly with the base sheet at the interface, thereby exhibiting excellent adhesion and flexibility and antistatic properties. An excellent performance that an effect is imparted can be obtained. In addition, the polysiloxane-modified polyhydroxypolyurethane resin used in the present invention is excellent from the viewpoint of reducing global warming gas because carbon dioxide can be incorporated into the resin and immobilized, and is obtained using the resin. The skin material that is produced is also compatible with environmental conservation that was not possible with conventional products.

Claims (7)

  A thermoplastic polyolefin resin sheet, and a topcoat layer formed directly on the sheet, or a topcoat layer formed via a primer layer formed on the sheet, and the topcoat A layer made of a thermoplastic polyolefin resin, characterized in that the layer is mainly composed of a polysiloxane-modified polyhydroxypolyurethane resin derived from a reaction between a 5-membered cyclic carbonate compound and an amine-modified polysiloxane compound.   The thermoplastic polyolefin resin skin material according to claim 1, wherein the five-membered cyclic carbonate compound constituting the polysiloxane-modified polyhydroxypolyurethane resin is obtained by reacting an epoxy compound with carbon dioxide.   The thermoplastic polyolefin resin skin material according to claim 2, wherein the polysiloxane-modified polyhydroxypolyurethane resin forming the topcoat layer contains 1 to 25 mass% of carbon dioxide derived from a raw material.   The thermoplastic polyolefin resin according to any one of claims 1 to 3, wherein the polysiloxane segment content in the molecule of the polysiloxane-modified polyhydroxypolyurethane resin forming the topcoat layer is 1 to 75 mass%. Made of skin material.   The top coat layer contains 1 substance or a combination of two or more kinds selected from organic fine powder or inorganic fine powder as a matting agent with respect to 100 parts by mass of the polysiloxane-modified polyhydroxypolyurethane resin. The thermoplastic polyolefin resin skin material according to any one of 1 to 4, which is formed of a composition blended at a ratio of ˜150 parts by mass.   The thermoplastic polyolefin according to any one of claims 1 to 5, wherein the topcoat layer is formed of a composition containing, in addition to the polysiloxane-modified polyhydroxypolyurethane resin, another resin different from the resin. Resin skin material.   7. The film according to claim 1, wherein the topcoat layer is a film crosslinked by a reaction between a hydroxyl group present in the structure of the polysiloxane-modified polyhydroxypolyurethane resin and a crosslinking agent that reacts with the hydroxyl group. Thermoplastic polyolefin resin skin material as described.

Images