JPS6143471B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a thermoformable skin material for covering cushion bodies for seats, furniture, etc., which is flexible, clearly shows wrinkles, and has excellent durability. BACKGROUND ART Up to now, skin materials have been proposed that are made of polyurethane-based synthetic leather and have an uneven pattern and are used for seats, furniture, and the like. However, most of these skin materials are polyester-based polyurethane, so in products that are used for long periods of time, such as car seats or reception chairs, the surface of the synthetic leather becomes sticky due to hydrolysis of the polyester-based polyurethane resin. If the condition is severe, the polyurethane resin layer laminated to the base material may peel off from the base material due to deterioration due to hydrolysis, and it may not be possible to use it for a long time. It was completely intolerable. Furthermore, when attempting to create a design with deep irregularities using a heated embossing mold, the design was not formed at all, or the resin layer did not have heat resistance and the resin layer adhered to the embossing mold, making it impossible to create the design. The present invention improves the above-mentioned drawbacks, and provides flexibility that allows deep uneven patterns to be formed by hot press molding.
The purpose is to provide synthetic leather with excellent durability. That is, the synthetic leather for hot press molding of the present invention is made of a stretchable fiber base material, a polyether-based polyester whose main component is polytetramethylene glycol, polypropylene glycol, or triol, or a hydroxyl compound having 4 or more carbon atoms, and 2 A polyurethane foam layer made of a polyester polyurethane whose polyol component is a polyester obtained by reacting with a basic acid, or a polyester polyurethane whose polyol component is an ε-caprolactone polyester, and whose softening point is 150°C or higher. Polyether polyurethane containing tetramethylene glycol as a polyol component or polycarbonate polyester polyurethane with a softening point of 150
℃ or higher, polyurethane film layers with a thickness of 20 to 70μ made of polyurethane with a 100% modulus of 20 to 200Kg/cm ² are laminated. As the fiber base material used in the present invention, knitted fabrics, woven fabrics, non-woven fabrics, etc., having an elongation rate of 30% or more in both length and width can be used. The polyurethane foam layer is formed from polyether polyurethane or polyester polyurethane by a dry method or a wet method. In the case of the dry method, polyether urethane obtained by reacting polyether polyol such as polytetramethylene glycol, polypropylene ether glycol, or triol with diisocyanate such as diphenylmethane diisocyanate, tolylene diisocyanate, and hexamethylene diisocyanate in excess. Using a prepolymer or a polyester obtained by reacting a hydroxyl compound having 4 or more carbon atoms with a dibasic acid as a polyol component, or using an ε-caprolactone polyester as a polyol component, diphenylmethane diisocyanate, tolylene diisocyanate, hexa It is formed by foaming and curing under heating and humidification using a polyester-based urethane prepolymer obtained by reacting an excessive amount of diisocyanate such as methylene diisocyanate.
On the other hand, in the case of the wet method, polyether polyurethane containing polytetramethylene ether glycol, polypropylene ether glycol, etc. as the polyol component or a polyester obtained by reacting a hydroxyl compound having 4 or more carbon atoms with a dibasic acid is used as the polyol component. Or, a solvent such as dimethyl formamide of a polyester urethane elastomer obtained by reacting an ε-caprolactone polyester or a polycarbonate polyester as a polyol component with a diisocyanate such as diphenylmethane diisocyanate, tolylene diisocyanate, hexamethylene diisocyanate, etc. Solvent removal is performed using a wet method using a solution.
Forms a microporous wet layer. The density of the polyurethane foam layer is preferably 0.2 to 0.6 g/cm ³ . Density of polyurethane foam layer is 0.2g/ ^cm3
If it is below, the physical properties will become weak and it will not be practical.
If it exceeds 0.6 g/cm ³ , the texture becomes hard and undesirable. In addition, the thickness of the polyurethane foam layer is 100μ
-1000μ is preferable, and if it is less than 100μ, unevenness of the base fabric will appear on the surface, which is unfavorable in terms of appearance. If it exceeds 1000μ, it will become thick and wrinkled, which is not preferable. Further, the softening point of the polyurethane foam layer is preferably 150°C or higher; if it is lower than 150°C, melting will occur during hot press molding, and if the softening point is significant, the foam layer will be destroyed during hot press molding, which is not preferable. The polyurethane film layer must be made of polyurethane that has excellent heat resistance, hydrolysis resistance, and light resistance, and has a softening point of 150°C or higher.
It is formed from a polyether polyurethane obtained by reacting this with a diisocyanate such as diphenylmethane diisocyanate or hexamethylene diisocyanate. The 100% modulus of the polyurethane film layer is 20
It must have physical properties of Kg/cm ² to 200 Kg/cm ² . If the 100% modulus is less than 20 Kg/cm ² , the physical properties are weak and a practical skin material cannot be obtained, and if it is more than 200 Kg/cm ² , the texture becomes hard, which is not preferable. In addition, the thickness of the polyurethane film layer is 20 μ~
It must be 70μ, and if it is less than 20μ, the physical properties will be weak, and if it is more than 70μ, the texture will be hard and undesirable. In the synthetic leather for hot press molding of the present invention, a thin film layer made of a specific synthetic resin can be further laminated on the polyurethane film layer. The thin film layer must be made of polyurethane or polyurethane-modified polyamino acid resin with excellent heat resistance, hydrolysis resistance, and light resistance. Such polyurethane may include polycarbonate polyester polyurethane or ε-caprolactone polyester as a polyol component. There are polyester-based polyurethanes, etc. In addition, the softening point of polyurethane and urethane-modified polyamino acid resin that form the thin film layer is
The temperature must be above 180℃; if it is below 180℃, it will stick to the mold during hot press molding, making it impossible to obtain a beautiful uneven pattern. The polyester polyurethane or urethane-modified polyamino acid resin must have a 100% modulus of 40 to 600 kg/cm ² and a yield value. Wrinkling is undesirable if the material does not have a yield value. Also, 100% modulus
When it is 40Kg/cm ² , wrinkles are difficult to form, and when it is 600Kg/cm ² or more, the texture becomes hard and undesirable. In addition, the thickness of the thin film layer must be 1μ to 10μ, and 1μ
If it is less than this, it is not preferable because wrinkle formation will be poor and it may partially adhere to the mold during hot press molding. If the thickness exceeds 10μ, not only the texture becomes hard, but also problems such as cracks in the thin film layer occur during long-term use. Furthermore, a more profound design can be expressed by laminating a flexible synthetic resin foam layer on the surface of the stretchable base material on which the polyurethane foam layer or polyurethane film layer is not laminated. The flexible synthetic resin foam layer preferably has excellent hydrolysis resistance, and includes, for example, semi-rigid polyether polyurethane foam, polystyrene foam, polyethylene foam, polypropylene foam, and the like.
Further, the thicker the flexible synthetic resin foam layer, the deeper the design can be expressed. When laminating a polyurethane foam layer or flexible synthetic resin foam layer on a stretchable base material, self-adhesion is required during foaming of the synthetic resin that forms the polyurethane foam layer or flexible synthetic resin foam layer, as in integral foaming. They may be laminated and bonded using their properties, they may be bonded by fusion as in the frame lamination method, or they may be laminated and bonded using an adhesive. When using adhesives, any commonly used adhesive can be used, but in particular polyether polyurethanes or polyester urethanes that are made of the following polyurethanes that have excellent heat resistance and hydrolysis resistance. is preferred. Polyether-based polyurethanes include polyether-based polyurethanes containing polytetramethylene glycol, polypropylene glycol, or triol as polyol components, and polyester-based polyurethanes include 1,4-butanediol, 1,6 as polyol components. A polyester polyurethane whose polyol component is a polyester obtained by reacting a hydroxyl compound having 4 or more carbon atoms such as hexanediol or neopentyl glycol with a dibasic acid, or a polyester polyurethane whose polyol component is an ε-caprolactone polyester. Alternatively, a polyester-based polyurethane adhesive containing polycarbonate-based polyester as a polyol component is preferable. In addition, the polyether-based polyurethane adhesive or polyester-based polyurethane adhesive described above has a softening point of 150°C.
The above is preferable. If the softening point is below 150°C, it will soften during hot press molding, and if it is severe, it will become fluid and will not be effective as an adhesive, which is not preferable.
It is preferable that the 100% modulus has physical properties of 5 to 100 Kg/cm ² . If the 100% modulus is less than 5 Kg/cm ² , the strength will be weak, and if it is more than 100 Kg/cm ² , it will become hard and a flexible skin material will not be obtained, which is not preferable. Also, when using polyurethane adhesive,
The thickness of the adhesive layer formed is preferably 10μ to 200μ. If the thickness is less than 10 μm, the adhesive force to the base material will not be obtained, and the strength will be poor, which is not preferable. If it exceeds 200μ, the texture becomes hard and undesirable. Since the synthetic leather for heat press molding of the present invention is constructed as described above, it not only has excellent heat resistance but also excellent flexibility and feels very similar to natural leather. It is highly durable and has excellent heat press moldability due to the selection of a base material with elasticity and a resin with excellent heat resistance, and these properties combine to create a deep uneven pattern. It was suitable for applications that would be used for a long period of time, such as highly durable automobile seats and furniture. Examples of the present invention are listed below, but the present invention is not limited to these Examples. Example 1 A urethane-modified product of polyγ-methyl-D-glutamate was applied to the surface of a silicone paper with a diaphragm. polyurethane obtained by reacting diphenylmethane diisocyanate with
A solvent solution of urethane-modified polyamino acid resin having a softening point of 200°C is applied with a knife coater to a dry thickness of 3μ, and dried for 2 minutes in a heating dryer at 100°C to form a urethane-modified polyamino acid resin thin film. Form a layer with a softening point of 180°C and a 100% modulus of 50 on the urethane-modified polyamino acid resin thin film layer.
Kg/cm ² of polytetramethylene glycol-based polyurethane (mainly composed of polytetramethylene glycol and diphenylmethane diisocyanate) resin solution is applied to a dry thickness of 25μ, and this is heated and dried to form a polyurethane film. A foamable urethane elastomer compound mainly composed of a polypropylene glycol-based isocyanate-terminated polyurethane prepolymer (mainly composed of polypropylene glycol and diphenylmethane diisocyanate) is applied on the polyurethane film layer.
Coat it at 150g/m ² and heat it with a heating material at a temperature of 110℃ for 3 minutes under humidification to foam and harden it to a thickness of 250g/m2.
A polyurethane foam layer with μ, density of 0.53 g/cc, and softening point of 170° C. was obtained. Next, on the polyurethane foam layer, a polypropylene glycol-based two-component polyurethane adhesive obtained by reacting a polypropylene glycol-based polyurethane whose main components are polypropylene glycol and tolylene diisocyanate with a polyisocyanate is applied at a basis weight of 130 g/m ² The elongation rate is vertical.
50% cotton knitted fabric and 200% width were bonded together and heated at 100°C for 7 minutes to react and solidify the adhesive, and then the silicone paper was peeled off to obtain synthetic leather. A polyether polyurethane foam (density 20 kg/m ³ , thickness 20 mm) was laminated to the back side of this synthetic leather using a frame lamination method. Next, the temperature is 160℃, the pressure is 30Kg/cm ² ,
Pressing was carried out in a mold with a striped design for 180 seconds to obtain a durable laminate suitable for automobile seats having an uneven pattern. Table 1 shows the measurement results of hot press moldability and hydrolysis resistance of this product.
and 2. Example 2 Softening point of 150℃ on the surface of silicone paper with aperture,
A polycarbonate polyester polyurethane (mainly composed of polycarbonate polyol and hydrogenated diphenylmethane diisocyanate) resin solution with a 100% modulus of 80 Kg/cm ² is dried and thickened.
Coat to a thickness of 40μ and heat dry to form a polyurethane film layer. On the polyurethane film layer, a polytetramethylene glycol-based isocyanate-terminated prepolymer (mainly composed of polytetramethylene glycol and diphenylmethane diisocyanate) A foamable urethane elastomer compound, ^mainly composed of Bonded, then heated for 4 minutes in a humidified heating machine at a temperature of 110°C to foam and harden, then peel off the release paper and create a thick
A synthetic leather having a polyurethane foam layer of 350μ, density 0.45g/cc, and softening point 180°C was obtained. A polypropylene glycol-based two-component polyurethane adhesive obtained by reacting polypropylene glycol-based polyurethane containing polypropylene glycol and tolylene diisocyanate as main components with polyisocyanate is applied to the back side of this synthetic leather.
Spray 100g/m ² and immediately apply polyether-based polyurethane foam (density 15Kg/m ³ , thickness 40
mm) and then heated at 110°C for 10 minutes to react and solidify the adhesive to obtain an integrated laminate. The laminate was heated at a temperature of 170℃, a pressure of 20Kg/cm ² , and a time of 120 minutes.
Durable furniture that is press-molded in seconds with a diamond-patterned mold, has a deep uneven pattern on the surface that closely resembles natural leather with a flexible texture, and is three-dimensionally shaped with no wrinkles at the corners. A laminate suitable for automobile seats was obtained. The measurement results of hot press moldability and hydrolysis resistance of this product are shown in Tables 1 and 2. Example 3 A urethane-modified product of polyγ-methyl D-glutamate (the urethane used for modification is a polyester obtained by reacting with 1,6 hexanediol adipic acid as a polyol component, and a A solvent solution of urethane-modified polyamino acid resin (polyurethane obtained by reacting enylmethane diisocyanate) with a softening point of 250°C was dried with a knife coater to a thickness of 3.
100% modulus is 100kg/ cm ² of polycarbonate polyester-based polyurethane (mainly composed of polycarbonate polyester-based polyol, hydrogenated diphenylmethane diisocyanate, and hexamethylene diisocyanate) resin solution was applied to a dry thickness of 40μ, and while still sticky. The resin component is a polyether urethane elastomer obtained by reacting a polyether polyol mainly composed of polypropylene glycol with diphenylmethane diisocyanate.
A 20% dimethylformamide solution was applied to a nonwoven fabric with an elongation rate of 50% in length and 70% in width, and after desolvation in water at 25°C, it was dried to obtain a product with a thickness of 400μ and a density of 0.5.
g/cm ³ , a base material having a polyurethane foam layer with a softening point of 180°C is laminated with the polyurethane foam layer side,
After solidifying by heating at ℃ for 7 minutes, the silicone paper was peeled off to obtain synthetic leather. The same polyether-based polyurethane foam as in Example 1 was laminated on the back side of the synthetic leather using a frame lamination method to form a laminate, and then a checkered design mold was used to press it under the same conditions as in Example 1 to make it flexible. A laminate suitable for furniture seats, which has a texture, a deep uneven pattern on the surface, a clean finish, and excellent durability, was obtained. The measurement results of hot press moldability and hydrolysis resistance of this product are shown in Tables 1 and 2. Example 4 A solvent solution of ε-caprolactone polyurethane containing ε-caprolactone polyester polyol having a softening point of 190°C and hexamethylene diisocyanate as the main components was applied to the surface of a silicone paper with a diaphragm to a dry thickness of 5μ. , 100
A thin film layer was formed by drying for 2 minutes in a heated dryer at ℃, and on the thin film layer was added polytetramethylene glycol and diphenylmethane diisocyanate with a softening point of 170℃ and a 100% modulus of 95 kg/cm ² as main components. A polytetramethylene isocyanate-based polyurethane resin solution is applied to a dry thickness of 30μ, and this is heated and dried to form a polyurethane film layer, and 1,6-hexanediol and adipic acid are applied on the polyurethane film layer. A foamable urethane elastomer compound mainly composed of a polyester-based isocyanate-terminated prepolymer containing a polyester-based polyol obtained by reacting with diphenylmethane diisocyanate as a main component was applied at a basis weight of 180 g/m ² to maintain tackiness. The elongation rate is 50% vertically while holding it.
%, the raised sides of a 6,6-nylon knitted blanket with a width of 150% are pasted together, and then heated in a heating machine at a temperature of 110°C for 4 minutes under humidification to foam and harden, and then the release paper is peeled off. Thickness 370μ, density 0.53g/cc, softening point
A synthetic leather having a polyurethane foam layer at 175°C was obtained. The synthetic leather was heated at a temperature of 160°C and a pressure of 20Kg/cm ² for a period of time.
Press molding was performed in 180 seconds using a mold with a striped design to obtain a durable molded product suitable for a chair seat with an uneven pattern. The measurement results of hot press moldability and hydrolysis resistance of this product are shown in Tables 1 and 2. Example 5 Softening point of 170 on flat silicone paper surface
℃, a polytetramethylene glycol-based polyurethane resin solution containing polytetramethylene glycol and diphenylmethane diisocyanate as main components with a 100% modulus of 95 Kg/cm ² was applied to a dry thickness of 32 μm, and then heated and dried. to form a polyurethane film layer, and ε-
A foamable urethane elastomer compound mainly composed of an ε-caprolactone polyester isocyanate-terminated prepolymer containing caprolactone polyester polyol and diphenylmethane diisocyanate is applied at a basis weight of 160 g/m ² ,
This was heated in a heating machine at a temperature of 110° C. under humidification for 3 minutes to foam and harden, thereby obtaining a polyurethane foam layer having a thickness of 290 μm, a density of 0.55 g/cc, and a softening point of 175° C. Next, on the polyurethane foam layer, a two-component polyurethane adhesive made by reacting an ε-caprolactone polyester polyurethane containing ε-caprolactone polyester polyol and tolylene diisocyanate as main components with a polyisocyanate is applied to the polyurethane foam layer at a basis weight of 120 g/m ^{2 .} The elongation rate is 80% vertically and horizontally.
160% polyester/cotton blend knitted fabric was laminated and heated at 100°C for 7 minutes to react and solidify the adhesive, and then the silicone paper was peeled off to obtain synthetic leather. Polyethylene foam was laminated to the back side of this synthetic leather using a frame lamination method. Then the temperature
Pressed at 155℃, pressure 30Kg/cm ² and time 180 seconds using a mold with a leather grain pattern, it has a surface that closely resembles natural leather with a soft texture and an uneven pattern, and has no wrinkles at the corners. We have obtained a laminate suitable for furniture seats that are three-dimensionally shaped and have excellent durability. The measurement results of hot press moldability and hydrolysis resistance of this product are shown in Tables 1 and 2. Example 6 The same polyurethane resin used in Example 2 was applied to the surface of the silicone paper with a dry thickness of 40 mm.
1,4-butanediol, neopentyl glycol, and adipic acid. A foamable urethane elastomer compound containing a polyester-based isocyanate-terminated prepolymer containing enylmethane diisocyanate as the main component is applied at a basis weight of 200 g/m ² , and the elongation rate is 50% vertically and horizontally while it still has low tackiness.
The raised sides of a 150% 6,6-nylon knitted blanket were pasted together, then heated at a temperature of 115°C for 4 minutes under humidification to foam and harden, and then the release paper was peeled off.
Synthetic leather having a polyurethane foam layer with a thickness of 340 μm, a density of 0.61 g/cc, and a softening point of 165° C. was obtained. The synthetic leather is press-molded in a plaid pattern mold at a temperature of 150℃, a pressure of 25Kg/cm ² and a time of 170 seconds, resulting in a soft texture, a deep uneven pattern on the surface, and a durable, clean finish. A molded product suitable for an excellent office chair seat was obtained. The measurement results of hot press moldability and hydrolysis resistance of this product are shown in Tables 1 and 2. Example 7 Softening point 160 on flat silicone paper surface
℃, 100% modulus is 90Kg/ ^cm2 , a polycarbonate polyester polyurethane resin solution containing polycarbonate polyester polyol and hydrogenated diphenylmethane diisocyanate as the main components is applied to a dry thickness of 45μ. A polyurethane film layer is formed by heating and drying, and on the polyurethane film layer, a foamable urethane elastomer containing an ε-caprolactone polyester isocyanate-terminated prepolymer containing ε-caprolactone polyester polyol and diphenylmethane diisocyanate as main components is compounded. The product was coated with a basis weight of 200g/m ² , and while it was still sticky, the raised side of a single-sided raised fabric made of polyester knitted fabric with an elongation rate of 70% vertically and 130% horizontally was pasted, and then heated in a heating machine at 115°C. After foaming and curing by heating for 5 minutes in a humidified environment, the release paper was peeled off and the resulting product had a thickness of 310μ and a density of 0.58g/
cc, synthetic leather having a polyurethane foam layer with a softening point of 170°C was obtained. A two-component polyurethane adhesive made by reacting polypropylene glycol polyurethane containing polypropylene glycol and tolylene diisocyanate as main components with polyisocyanate was sprayed on the back side of this synthetic leather at a basis weight of 110 g/ ^m2 , and immediately The ether-based polyurethane foam was laminated and then heated at a temperature of 110°C for 10 minutes to react and solidify the adhesive to obtain an integrated laminate. The laminate was heated at a temperature of 150℃, a pressure of 30Kg/cm ² , and a time of 150 minutes.
Press-molded in seconds with a mold that has a natural leather-like grain pattern, reproduces a deep uneven pattern on the surface that closely resembles natural leather with a flexible texture, and is three-dimensionally shaped and durable with no wrinkles at the corners. A laminate suitable for automobile seats with excellent properties was obtained. The measurement results of hot press moldability and hydrolysis resistance of this product are shown in Tables 1 and 2. Comparative example 1 Softening point 150℃100 on the surface of silicone paper with aperture
A one-component polyester-based polyurethane resin solution whose polyol component is polyester obtained by reacting ethylene glycol and adipic acid with a modulus of 200 Kg/cm ² was applied to a dry thickness of 30 μ, and heated to 100°C. Heat and dry for 3 minutes to form a polyurethane thin film layer, and soften the softening point on the polyurethane thin film layer.
Ethylene at 150℃ and 100% modulus of 50Kg/cm ²
A two-component polyester polyurethane resin solution based on diethylene glycol-adipic acid was applied using a knife coater at a basis weight of 130 g/m ² , and while it was still sticky, a Tetron (trademark) rayon blended fabric with a length of 30% and width of 50% was created. Laminate the brushed sides of the
After drying by heating for 10 minutes in a heating machine, the silicone paper was peeled off after solidification to obtain synthetic leather. Next, in the same manner as in Example 1, polyether-based polyurethane foam was bonded to the back side of the synthetic leather and pressed using a striped pattern mold to obtain a laminate.
Tables 1 and 2 show the measurement results of the hot press moldability and hydrolysis resistance of the obtained laminate. Comparative Example 2 A polyester-based two-component polyurethane resin solution containing a polyester obtained by reacting ethylene glycol and adipic acid as a polyol component was coated on silicone paper with a basis weight of 150 g using a knife coater.
^m2 , dried at 60℃ for 3 minutes, and while it was still sticky, attached the raised side of a 50% vertical by 70% horizontal cotton fabric, and after the reaction solidified, peeled off the silicone paper. An 8-nylon resin solution with a softening point of 200°C was applied to the surface of the polyurethane resin layer of the resulting laminate consisting of the cotton napkin and the polyurethane resin layer using a printer at a basis weight of 50g/m ² and then heated at 150°C for 3 minutes. Synthetic leather was obtained by heating and drying. Next, in the same manner as in Example 1, an ether-based polyurethane foam was laminated to the back side of the synthetic leather and pressed using a diamond pattern design mold to obtain a laminate. Tables 1 and 2 show the measurement results of the hot press moldability and hydrolysis resistance of the obtained laminate. Comparative example 3 Softening point 145℃ on the surface of silicone paper with aperture,
A polytetramethylene glycol-based polyurethane resin solution containing polytetramethylene glycol and diphenylmethane diisocyanate as main components with a 100% modulus of 40 kg/cm ² is applied to a dry thickness of 35 μm, and this is heated and dried. There is no polyurethane film layer, and on the polyurethane film layer, a foamable urethane elastomer compound mainly composed of polypropylene glycol-based isocyanate-terminated polyurethane prepolymer containing polypropylene glycol and diphenylmethane diisocyanate as main components is applied with a basis weight of 160 g/m ² While it was still sticky, the raised side of a single-sided raised fabric made of 6,6-nylon knitted material with an elongation rate of 50% in length and 150% in width was pasted together, and then heated under humidification in a heating machine at a temperature of 110°C. After heating for 4 minutes to foam and harden, remove the release paper and
A synthetic leather having a polyurethane foam layer with a diameter of 280μ, a density of 0.56g/cc, and a softening point of 150°C was obtained. Next, in the same manner as in Example 1, polyether-based polyurethane foam was laminated to the back surface of the synthetic leather, and pressed using a striped mold to obtain a laminate. Tables 1 and 2 show the measurement results of the hot press moldability and hydrolysis resistance of the obtained laminate. Comparative example 4 Softening point 170℃ on the surface of silicone paper with aperture,
A polycarbonate polyester polyurethane resin solution with a 100% modulus of 100 Kg/cm ² and consisting mainly of polycarbonate polyester polyol, hydrogenated diphenylmethane diisocyanate, and hexamethylene diisocyanate was applied to a dry thickness of 50μ. This is heated and dried to form a polyurethane film layer, and on the polyurethane film layer, a two-component polyurethane adhesive made by reacting polypropylene glycol polyurethane whose main components are polypropylene glycol and tolylene diisocyanate with polyisocyanate is applied in a weight of 120 g. ^Cotton knitted fabric with an elongation rate of 50% vertically and 200% horizontally was bonded together and heated at 100°C for 7 minutes to react and solidify the adhesive, and then the silicone paper was peeled off to obtain synthetic leather. Next, in the same manner as in Example 1, polyether polyurethane foam was laminated to the back side of the synthetic leather and pressed using a mold with a lattice pattern design to obtain a laminate. Tables 1 and 2 show the measurement results of the hot press moldability and hydrolysis resistance of the obtained laminate. The hydrolysis resistance was tested by the following method. A sample piece of the skin material was left for 4 weeks at a relative humidity of 95% and a temperature of 70°C (the young angle test), and then the resin layer of the sample piece was subjected to a tapered surface abrasion tester with a load of 1 kg and a friction count of 1000 times. The degree of surface wear was observed.

【table】

【table】

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[Table] As is clear from the table, the product of the present invention is the only synthetic leather that has excellent hot press moldability and excellent hydrolysis resistance.

Claims (1)

[Scope of Claims] 1 A polyether polyurethane whose main component is polytetramethylene glycol, polypropylene glycol, or triol, or a hydroxyl compound having 4 or more carbon atoms, is reacted with a dibasic acid on a fiber base material having elasticity. A polyurethane foam layer comprising a polyester-based polyurethane having a polyester obtained as a polyester as a polyol component, or a polyester-based polyurethane having an ε-caprolactone-based polyester as a polyol component, the polyurethane having a softening point of 150°C or higher. Polyether polyurethane containing polytetramethylene glycol as a polyol component, or polycarbonate polyester polyurethane, with a softening point of 150°C or higher and 100% modulus.
Thickness 20~20~200Kg/ ^cm2 made of polyurethane
Synthetic leather for heat press molding made of laminated 70μ polyurethane film layers.