Cool-feeling polyurethane synthetic leather as well as preparation method and application thereof

Abstract

The invention discloses cool polyurethane synthetic leather as well as a preparation method and application thereof. The synthetic leather is sequentially composed of a cool polyurethane surface layer, a polyurethane thermal insulation layer, a polyurethane foaming bonding layer and a base material layer from top to bottom, wherein the cool polyurethane surface layer is prepared from the following components in parts by weight: 100 parts of polyurethane resin, 2-4 parts of a wear-resistant additive, 1-2 parts of a curing agent and 1-5 parts of cool color paste; the cool color paste is prepared by mixing 1-10 parts of a microcapsule phase change material, 2-10 parts of an infrared reflection pigment and 40-60 parts of water; the polyurethane heat insulation layer comprises polyurethane resin and hollow silicon dioxide modified by a silane coupling agent. The infrared reflection pigment and the microcapsule phase change material in the cool polyurethane surface layer reduce the surface temperature of the polyurethane synthetic leather. Meanwhile, a heat insulation material in the polyurethane heat insulation layer and a foaming process of the polyurethane foaming bonding layer are combined, so that the cool-feeling polyurethane synthetic leather material which is slowly heated at high temperature in summer is prepared.

Description

Technical Field

[0001] The invention belongs to the technical field of functional polyurethane synthetic leather, and particularly relates to cool polyurethane synthetic leather, a preparation method and application thereof. Background Art

[0002] Due to its outstanding environmental protection characteristics, durability and comfort, polyurethane synthetic leather composite materials are widely used in footwear, sports equipment, sofa furniture, office supplies, electronic packaging, interior and engineering decoration, automotive interior and other fields.

[0003] In the new energy vehicle sector, polyurethane synthetic leather, like other polymer materials, absorbs and converts some of the sunlight energy into heat when exposed to prolonged sunlight, causing its surface temperature to rise. This is especially true in the relatively enclosed environment of a car, which lacks effective heat dissipation mechanisms. This heat is difficult to dissipate quickly, exacerbating the temperature rise and creating a negative user experience.

[0004] Furthermore, while polyurethane synthetic leather's diverse color palette meets consumers' personalized needs, certain dark or highly absorptive colors are more likely to absorb sunlight, further increasing surface temperature. Furthermore, the lightweight design of polyurethane synthetic leather reduces the material's heat capacity and heat dissipation capabilities, making the surface temperature more susceptible to environmental influences.

[0005] Therefore, effective measures need to be taken to reduce the temperature rise rate of polyurethane synthetic leather. Providing customers with a cool feeling in high-temperature environments is of great significance. However, there is currently a lack of cool-feeling polyurethane synthetic leather products, so it is of great value to start developing such products. Summary of the Invention

[0006] In response to the problems existing in the above-mentioned prior art, the purpose of the invention is to combine the extremely high environmental protection, durability and comfort requirements of new energy vehicles for interior materials, and the consumer demand for a cool feeling on the surface of automobile interior materials when the temperature is high, to provide a cool polyurethane synthetic leather that can not only meet the requirements of automobile interior for VOC and odor, but also has the advantages of slow heating under sunlight, cool at high temperatures, soft and full feel, good skin-friendly surface, high physical strength, oil resistance, and aging resistance.

[0007] The object of the present invention is achieved through the following technical solutions:

[0008] The first aspect of the present invention is to provide a cool feeling polyurethane synthetic leather, which is composed of a cool feeling polyurethane surface layer, a polyurethane heat insulation layer, a polyurethane foam adhesive layer and a substrate layer from top to bottom, wherein:

[0009] The cool feeling polyurethane surface layer is prepared from the following components by weight: 100 parts of polyurethane resin, 2-4 parts of wear-resistant additive, 1-2 parts of curing agent, and 1-5 parts of cool feeling color paste;

[0010] The cool feeling color paste is prepared by mixing 1-10 parts of microcapsule phase change material, 2-10 parts of infrared reflective pigment and 40-60 parts of water;

[0011] The polyurethane heat-insulating layer comprises polyurethane resin and hollow silica modified by a silane coupling agent.

[0012] Wherein, the polyurethane resin is a polyether polyurethane resin; the curing agent is a water-based isocyanate curing agent, preferably HDI trimer.

[0013] The core material of the microcapsule phase change material is paraffin wax, and the capsule material is polyether polyurethane;

[0014] The infrared reflective pigment includes one or more of chromium black, cobalt blue, chromium brown, chromium green, titanium nickel yellow, titanium white and perylene black.

[0015] In a further embodiment, the polyurethane heat insulation layer is composed of the following components in parts by weight: 100 parts of polyurethane resin, 4-6 parts of curing agent, 10-20 parts of hollow silica, and 1-2 parts of silane coupling agent.

[0016] Preferably, the pore size of the hollow silica is 20-50 μm.

[0017] The silane coupling agent is a hydroxyl or amino-terminated silane coupling agent; wherein the hydroxyl silane coupling agent, such as 3-hydroxypropyltrimethoxysilane (MPTMS), refers to a silane coupling agent containing a hydroxyl (-OH) functional group in the molecule, which can react with the hydroxyl or other functional groups in the polymer material to form a chemical bond, thereby enhancing the adhesion and mechanical properties of the material.

[0018] Amino-terminated silane coupling agents are silane coupling agents containing amino (-NH2 or -NH-) functional groups in their molecules. They can react with functional groups such as carboxyl and aldehyde groups in polymer materials to form chemical bonds, thereby improving the material's adhesion, water resistance, heat resistance, and other properties. Common examples include 3-aminopropyltrimethoxysilane (APS) and N(2-aminoethyl)-3-aminopropylmethoxysilane (AAPS).

[0019] The polyurethane foam adhesive layer is prepared from the following components in parts by weight: 100 parts of polyol, 50-70 parts of polyol isocyanate prepolymer, 30-50 parts of flame retardant, 0.1-0.3 parts of water and 0.2-0.35 parts of catalyst.

[0020] The catalyst is composed of 0.1-0.15 parts of organic metal catalyst and 0.1-0.2 parts of amine catalyst.

[0021] More preferably, the flame retardant is one or more of ammonium polyphosphate, magnesium hydroxide, aluminum hydroxide or hydrotalcite.

[0022] In a further embodiment, the substrate layer is a polyester fiber base cloth.

[0023] A second aspect of the present invention is to provide a method for preparing the cool feeling polyurethane synthetic leather, comprising the following steps:

[0024] (1) applying a cool feeling polyurethane surface layer slurry on the release paper to a thickness of 0.2-0.25 mm, and drying to form a cool feeling polyurethane surface layer;

[0025] Preferably, the drying temperature is 130-140°C and the drying time is 5-7 minutes;

[0026] (2) coating a polyurethane insulation layer slurry on the cool polyurethane surface layer and drying it to a coating thickness of 0.1-0.15 mm; wherein the drying temperature is 130-140° C. and the drying time is 5-7 minutes;

[0027] (3) coating the polyurethane foam adhesive layer slurry on the polyurethane thermal insulation layer with a coating thickness of 0.2-0.3 mm, and pre-reacting it at a temperature of 120-130° C. for 2-3 minutes to form a semi-dry polyurethane adhesive layer;

[0028] (4) Laminating the substrate layer on the polyurethane adhesive layer, drying, and peeling off the release paper to obtain a cool-feeling polyurethane synthetic leather; wherein the drying temperature is 130-140° C., and the drying time is 5-6 minutes.

[0029] The third aspect of the present invention is to provide applications of the cool feeling polyurethane synthetic leather, which is used in outdoor decoration and automobile interior decoration.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The cooling color paste added to the cool polyurethane surface layer of the present invention is made from a mixture of microcapsule phase change material, infrared reflective pigment, and water. The infrared reflective pigment forms an infrared reflective film that reflects some of the sun's infrared rays, preventing rapid surface temperature rise. Simultaneously, the microcapsule phase change material absorbs the unreflected infrared energy, reducing the surface temperature of the polyurethane synthetic leather.

[0032] The polyurethane insulation layer of the present invention contains hollow silica, which has a heat-insulating effect. Hollow silica is a nanomaterial with a hollow structure. The pores contain a large amount of air or gas, which can slow the transmission of heat. The tiny particles of hollow silica can also scatter and absorb some heat, thereby reducing the transfer of heat to the surrounding environment.

[0033] The polyurethane foam adhesive layer of the present invention is formed by foaming and contains a large number of tiny bubbles within it, which effectively block heat transfer. Therefore, when used as an adhesive layer, the polyurethane foam material can significantly reduce heat transfer across the material surface, providing a thermal insulation effect. In addition to its thermal insulation properties, the polyurethane foam material also has excellent adhesive properties.

[0034] Therefore, the cool polyurethane synthetic leather of the present invention has a cool polyurethane surface layer, a polyurethane heat insulation layer, and a polyurethane foam adhesive layer, which ensures that the surface of the polyurethane synthetic leather heats up slowly, thereby bringing a cool feeling experience to the user.

[0035] In addition, due to the significant difference in polarity between microcapsule phase change materials, hollow silica, and polyurethane resin, adding a large amount of them will cause agglomeration in the polyurethane resin, thereby affecting the performance of the product. Therefore, the cooling polyurethane surface material of the present invention is a layer of polyurethane coated on the surface of the microcapsule phase change material to promote its dispersion in the polyurethane resin; the hollow silica in the polyurethane insulation layer is modified using a hydroxyl or amino-terminated silane coupling agent, and the hydroxyl or amino group reacts with the curing agent to form a network structure in the polyurethane, thereby ensuring its dispersibility in the polyurethane resin. That is, by improving the dispersibility of microcapsule phase change materials and hollow silica in the polyurethane material, the present invention improves the functionality of the product while ensuring the durability of the product.

[0036] The cool-feeling polyurethane synthetic leather produced by the present invention has an infrared reflectivity of ≥55%, heats up slowly under sunlight, and reaches an equilibrium temperature 10-15°C lower than the surface temperature of conventional products, providing consumers with a cool summer experience. While providing comfort, the product is also durable, meeting 10-year hydrolysis resistance requirements (no cracking or powdering on the leather surface at 70°C, 95% RH, and 10W). It also exhibits room-temperature flexing resistance of 100,000 times without cracking, dry and wet rubbing color fastness of ≥4 after 500 cycles, peel strength of ≥30N / 3cm, and flame retardancy that meets the national standard GB-8410A-0. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to the embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0038] In addition, unless otherwise specified, the preparation processes in the following examples are all conventional means in the prior art in the art, and therefore, they are not described in detail; the parts in the following embodiments are all parts by weight.

[0039] The raw material information used in the following examples is as follows:

[0040] Polyurethane resin brand LT-50, produced by Hefei Anli Polyurethane New Materials Co., Ltd.

[0041] The wear-resistant additive can be selected from molybdenum disulfide, polytetrafluoroethylene powder, graphite, calcium aluminum silicate, aluminum oxide, polydimethylsiloxane, etc. In the following examples, the wear-resistant additive is selected from the brand produced by Dow Chemical, DOWSIL TM 51 Additive;

[0042] The curing agent in the present invention can be selected from toluene diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), etc. In the following examples, the curing agent is HDI trimer, which is Yantai Wanhua WANNATE HT-100;

[0043] The infrared reflective pigments of the present invention include one or more of iron chrome black, cobalt blue, iron titanium brown, chrome green, titanium nickel yellow, titanium white and perylene black, all of which are purchased from BASF;

[0044] Hollow silica was purchased from Zhengzhou Shenglait Hollow Microsphere New Materials Co., Ltd., with the brand name HL25;

[0045] The silane coupling agent in the present invention can be selected from 3-hydroxypropyltrimethoxysilane and 3-aminopropyltriethoxysilane (XHG-730), which are purchased from Zhejiang Xin'an Chemical Group Co., Ltd.

[0046] The polyol is a polyether polyol produced by BASF Polyurethanes (China) Co., Ltd., and the brand is polyol combination CC 6945 / 1100C-A.

[0047] The manufacturer of polyol isocyanate prepolymer is BASF Polyurethanes (China) Co., Ltd., and the brand is HAPTEXCC 6945 / 1100C-B;

[0048] The flame retardant in the present invention is one or more of ammonium polyphosphate, magnesium hydroxide, aluminum hydroxide or hydrotalcite. In the following examples, the flame retardant is ammonium polyphosphate AP 462 from Clariant.

[0049] The catalyst is composed of 0.1-0.15 parts of an organic metal catalyst and 0.1-0.2 parts of an amine catalyst, wherein the organic metal catalyst includes a metallocene catalyst, a palladium catalyst, a copper silicon catalyst, etc., and BASF's 92C-CC is selected in this embodiment; the amine catalyst includes N,N-dimethylcyclohexylamine, triethylamine, N,N-dimethylbenzylamine, triethanolamine, etc., and BASF's 93600 is selected in this embodiment;

[0050] The above reagents are only used to illustrate the sources and components of the reagents used in the experiments of the present invention so as to fully disclose the technology of the present invention, but it does not mean that the present invention cannot be achieved by using other similar reagents or reagents provided by other suppliers.

[0051] Example 1:

[0052] A cool feeling polyurethane synthetic leather and a preparation method thereof, comprising the following steps:

[0053] (1) coating a cool feeling polyurethane surface layer slurry on a release paper to a thickness of 0.2 mm, and drying at 130° C. for 7 minutes to form a cool feeling polyurethane surface layer;

[0054] The cool feeling polyurethane surface slurry is composed of 100 parts of polyurethane resin, 2 parts of wear-resistant additive, 1 part of curing agent and 1 part of cool feeling color paste;

[0055] The cool feeling color paste is made by mixing 5 parts of microcapsule phase change material, 7 parts of infrared reflective pigment and 50 parts of water.

[0056] (2) coating the polyurethane heat insulation layer slurry on the cool polyurethane surface layer with a coating thickness of 0.1 mm; and drying at 130° C. for 7 minutes to form a polyurethane heat insulation layer;

[0057] The polyurethane thermal insulation slurry is composed of 100 parts of polyurethane resin, 4 parts of curing agent, 10 parts of hollow silica, and 1 part of 3-aminopropyltriethoxysilane.

[0058] (3) coating a polyurethane foam adhesive layer slurry on the polyurethane hollow insulation layer with a thickness of 0.2 mm, and pre-reacting it at a temperature of 120° C. for 3 minutes to form a semi-dry polyurethane adhesive layer;

[0059] The composition of the polyurethane foam adhesive layer is 100 parts of polyol, 50 parts of polyol isocyanate prepolymer, 30 parts of flame retardant, 0.1 parts of water, 0.1 parts of organic metal catalyst 92C-CC and 0.1 parts of amine catalyst 93600.

[0060] (4) Laminating a 0.8 mm polyester fiber base cloth on the semi-dry polyurethane adhesive layer, heating and aging at 130° C., keeping the temperature for 6 minutes, and peeling off the release paper to obtain a cool feeling polyurethane synthetic leather product.

[0061] Example 2:

[0062] A cool feeling polyurethane synthetic leather and a preparation method thereof, comprising the following steps:

[0063] (1) coating a cool feeling polyurethane surface layer slurry on a release paper to a thickness of 0.25 mm, and drying at 135° C. for 6 minutes to form a cool feeling polyurethane surface layer;

[0064] The cool feeling polyurethane surface slurry is composed of 100 parts of polyurethane, 3 parts of wear-resistant additive, 1.5 parts of curing agent and 3 parts of cool feeling color paste;

[0065] The cool feeling color paste is made by mixing 10 parts of microcapsule phase change material, 2 parts of infrared reflective pigment and 60 parts of water.

[0066] (2) coating a polyurethane thermal insulation layer slurry on the cool polyurethane surface layer to a thickness of 0.15 mm; and drying at 135° C. for 6 minutes to form a polyurethane thermal insulation layer;

[0067] The composition of the polyurethane thermal insulation slurry is 100 parts of polyurethane, 5 parts of curing agent, 15 parts of hollow silica, and 1.5 parts of 3-aminopropyltriethoxysilane;

[0068] (3) coating the polyurethane foam adhesive layer slurry on the polyurethane thermal insulation layer with a thickness of 0.25 mm, and pre-reacting it at a temperature of 125° C. for 2.5 minutes to form a semi-dry polyurethane adhesive layer;

[0069] The composition of the polyurethane foam adhesive layer is 100 parts of polyol, 60 parts of polyol isocyanate prepolymer, 40 parts of flame retardant, 0.2 parts of water, 0.12 parts of organic metal catalyst 92C-CC and 0.15 parts of amine catalyst 93600;

[0070] (4) laminating a 0.8 mm polyester fiber base fabric on the semi-dry polyurethane adhesive layer, heating and aging at 135° C., keeping the temperature for 5 minutes, and peeling off the release paper to obtain a cool feeling polyurethane synthetic leather product;

[0071] Example 3:

[0072] A cool feeling polyurethane synthetic leather and a preparation method thereof, comprising the following steps:

[0073] (1) coating a water-based polyurethane surface layer slurry on the release paper to a thickness of 0.25 mm, and drying at 140° C. for 5 minutes to form a cool feeling polyurethane surface layer;

[0074] The cool feeling polyurethane surface slurry is composed of 100 parts of polyurethane, 4 parts of wear-resistant additive, 2 parts of curing agent and 5 parts of cool feeling color paste;

[0075] The cool feeling color paste is made by mixing 1 part of microcapsule phase change material, 10 parts of infrared reflective pigment and 40 parts of water.

[0076] (2) coating a polyurethane thermal insulation layer slurry on the cool polyurethane surface layer to a thickness of 0.15 mm; and drying at 140° C. for 6 minutes to form a polyurethane thermal insulation layer;

[0077] The composition of the polyurethane thermal insulation slurry is 100 parts of polyurethane, 6 parts of curing agent, 20 parts of hollow silica, and 2 parts of 3-hydroxypropyltrimethoxysilane;

[0078] (3) coating a polyurethane foam adhesive layer slurry on the polyurethane hollow insulation layer with a coating thickness of 0.25 mm, and pre-reacting it at a temperature of 130° C. for 2 minutes to form a semi-dry polyurethane adhesive layer;

[0079] The composition of the polyurethane foam adhesive layer is 100 parts of polyol, 70 parts of polyol isocyanate prepolymer, 50 parts of flame retardant, 0.3 parts of water, 0.15 parts of organic metal catalyst 92C-CC and 0.2 parts of amine catalyst 93600;

[0080] (4) Laminating a 0.8 mm polyester fiber base cloth on the semi-dry polyurethane adhesive layer, heating and aging at 140° C., keeping the temperature for 5 minutes, and peeling off the release paper to obtain a cool feeling polyurethane synthetic leather product.

[0081] Comparative Example 1:

[0082] The preparation method is the same as that of Example 1, with the only difference being that no cool color paste is added to the cool polyurethane surface layer.

[0083] Comparative Example 2:

[0084] The preparation method is the same as that of Example 1, with the only difference being that no microcapsule phase change material is added to the cool feeling color paste.

[0085] Comparative Example 3:

[0086] The preparation method is the same as that of Example 1, with the only difference being that no infrared reflective pigment is added to the cool feeling color paste.

[0087] Comparative Example 4:

[0088] The preparation method is the same as that of Example 1, except that no polyurethane heat insulation layer is added.

[0089] Comparative Example 5:

[0090] The preparation method is the same as that of Example 1, with the only difference being that the polyurethane thermal insulation layer does not contain hollow silica, but is replaced with an equal amount of ordinary silica.

[0091] Comparative Example 6:

[0092] The preparation method is the same as that of Example 1, with the only difference being that no silane coupling agent is added to the polyurethane thermal insulation layer.

[0093] Comparative Example 7:

[0094] The preparation method is the same as that of Example 1, with the only difference being that no water is added to the polyurethane foam adhesive layer.

[0095] The polyurethane synthetic leathers prepared in Examples 1-3 and Comparative Examples 1-7 were subjected to relevant performance tests, and the test results are shown in Table 1 below.

[0096] Among them: the surface temperature is tested using an infrared thermometer;

[0097] The heating rate is the ratio of the temperature difference to the time;

[0098] The reflectivity is tested by a reflectivity meter;

[0099] The hydrolysis resistance is carried out in accordance with the provisions of Appendix A of QB / T 4671-2014;

[0100] 100,000 flexures at room temperature in accordance with the provisions of QB / T 2714-2018;

[0101] Color fastness is rubbed according to GB / T 3920-2008, and the sample is graded according to GB / T 251-2008;

[0102] The peel strength is tested in accordance with the provisions of 5.9 of GB / T 8949-2008;

[0103] GB8410 horizontal burning velocity is tested using an automobile interior combustion instrument.

[0104] Table 1 Performance test results of products obtained in various embodiments and comparative examples

[0105]

[0106] In the table above: "A-0" in the GB8410 horizontal burning velocity indicates that the combustion has not reached the first mark, and "B" indicates that the combustion has not reached the second mark.

[0107] If the combustion passes the second mark, the combustion speed is recorded, and the combustion speed V=S / t, where S is the distance from the first combustion line to the end of combustion, and t is the corresponding combustion time.

[0108] As shown in the table above, a comparison of Example 1 with Comparative Examples 1-3 reveals that the addition of a cooling paste made from a mixture of microcapsule phase change material, infrared reflective pigment, and water significantly reduces the surface temperature and heating rate of polyurethane synthetic leather. Furthermore, the microcapsule phase change material and infrared reflective pigment have a synergistic cooling effect.

[0109] Comparison of Example 1 with Comparative Examples 4-5 shows that the hollow silica in the polyurethane heat insulation layer has a heat insulation effect, slowing down the transmission of heat, thereby reducing the temperature of the polyurethane composite material.

[0110] Comparison of Example 1 and Comparative Example 6 reveals that the hollow silica in Example 1 is modified with a hydroxyl- or amino-terminated silane coupling agent. The hydroxyl or amino groups react with the curing agent to form a network structure within the polyurethane, ensuring its dispersibility within the polyurethane resin. This, in turn, ensures the product's durability. However, in Comparative Example 6, the hollow silica was not modified with a silane coupling agent, resulting in cracking on the leather surface of the final product after 100,000 flex cycles at room temperature.

[0111] Comparison of Example 1 and Comparative Example 7 reveals that in Example 1, water reacts with the isocyanate prepolymer to produce carbon dioxide, which then foams and forms closed cells in the adhesive layer. These cells provide a certain degree of insulation, resulting in a slower heating rate than in Comparative Example 7. Furthermore, since no water was added in Comparative Example 7, the isocyanate prepolymer reacts entirely with the polyol, resulting in an excessively high hard segment ratio, a brittle product, and poor folding resistance. The slightly better flame retardancy of Comparative Example 7 compared to the Examples is due to the fewer cells in Comparative Example 7, which results in slightly poorer air flow.

[0112] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A cool feeling polyurethane synthetic leather, characterized in that: It consists of a cool polyurethane surface layer, a polyurethane heat insulation layer, a polyurethane foam adhesive layer and a substrate layer from top to bottom, wherein: The cool feeling polyurethane surface layer is prepared from the following components by weight: 100 parts of polyurethane resin, 2-4 parts of wear-resistant additive, 1-2 parts of curing agent, and 1-5 parts of cool feeling color paste; The cool feeling color paste is prepared by mixing 1-10 parts of microcapsule phase change material, 2-10 parts of infrared reflective pigment and 40-60 parts of water; The polyurethane heat-insulating layer comprises polyurethane resin and hollow silica modified by a silane coupling agent.

2. The cool feeling polyurethane synthetic leather according to claim 1, characterized in that: The polyurethane heat insulation layer is prepared from the following components in parts by weight: 100 parts of polyurethane resin, 4-6 parts of curing agent, 10-20 parts of hollow silica, and 1-2 parts of silane coupling agent.

3. The cool feeling polyurethane synthetic leather according to claim 1, characterized in that: The polyurethane foam adhesive layer is prepared from the following components in parts by weight: 100 parts of polyol, 50-70 parts of polyol isocyanate prepolymer, 30-50 parts of flame retardant, 0.1-0.3 parts of water and 0.2-0.35 parts of catalyst.

4. The cool feeling polyurethane synthetic leather according to claim 1, characterized in that: The core material of the microcapsule phase change material is paraffin wax, and the capsule material is polyether polyurethane; The infrared reflective pigment includes one or more of iron chrome black, cobalt blue, iron titanium brown, chrome green, titanium nickel yellow, titanium white and perylene black.

5. The cool feeling polyurethane synthetic leather according to claim 1 or 2, characterized in that: The polyurethane resin is a polyether polyurethane resin; The curing agent is an isocyanate curing agent.

6. The cool feeling polyurethane synthetic leather according to claim 1 or 2, characterized in that: The pore size of the hollow silica is 20-50um; the silane coupling agent is a hydroxyl or amino-terminated silane coupling agent.

7. The cool feeling polyurethane synthetic leather according to claim 1, characterized in that: The substrate layer is a polyester fiber base cloth.

8. The cool feeling polyurethane synthetic leather according to claim 3, characterized in that: The catalyst is composed of 0.10-0.15 parts of an organic metal catalyst and 0.1-0.2 parts of an amine catalyst; The flame retardant is one or more of ammonium polyphosphate, magnesium hydroxide, aluminum hydroxide or hydrotalcite.

9. The method for preparing the cool feeling polyurethane synthetic leather according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) coating a cool feeling polyurethane surface layer slurry on the release paper with a coating thickness of 0.2-0.25 mm, and drying to form a cool feeling polyurethane surface layer; (2) coating a polyurethane heat insulation layer slurry on the cool polyurethane surface layer and drying the slurry, with a coating thickness of 0.1-0.15 mm; (3) coating a polyurethane foam adhesive layer slurry on the polyurethane thermal insulation layer with a coating thickness of 0.2-0.3 mm, pre-reacting at a temperature of 120-130° C. for 2-3 minutes to form a semi-dry polyurethane adhesive layer; (4) Laminating the substrate layer on the polyurethane adhesive layer, drying, and peeling off the release paper to obtain a cool feeling polyurethane synthetic leather.

10. The use of the cool feeling polyurethane synthetic leather according to any one of claims 1 to 8, characterized in that: The cool feeling polyurethane synthetic leather is used for outdoor decoration and automobile interior decoration.

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