Preparation process of leather cloth with cool feeling and its product

Abstract

The present application relates to the technical field of leather cloth processing, and more specifically, to a leather cloth preparation process and product with a cool feeling, comprising the following preparation steps: S1, chitosan, polylactic acid, polyurethane, paraffin, nano-silicon dioxide, heat dissipation filler, hydroxypropyl methylcellulose, silane coupling agent, anti-ultraviolet agent and silicone oil are mixed to prepare a mixture; S2, the mixture prepared in step S1 is extruded through a spinneret, cooled, drawn, oiled, dried and wound to prepare a cool fiber; S3, the cool fiber is then prepared by a non-woven process to obtain a leather cloth with a cool feeling. The present application prepares leather cloth through the above-mentioned preparation process and formula, so that the leather cloth has good cool feeling, air permeability and moisture permeability. It can be used to prepare clothing, bedding and household items that are in direct contact with the skin.

Description

Technical Field

[0001] The present application relates to the technical field of leather cloth processing, and more specifically, to a leather cloth preparation process and product having a cool feeling. Background Art

[0002] In hot weather, cool fabrics can make people feel cool and comfortable, making their lives more comfortable. The main reason is that cool fabrics have good heat dissipation and moisture absorption properties, which can quickly dissipate the body's heat and accelerate the discharge of sweat, keeping the body cool and comfortable.

[0003] Polyurethane leather cloth is a high-quality fabric with a similar appearance and texture to genuine leather. It is stronger than genuine leather and can withstand more friction and wear. It is one of the most commonly used artificial leathers in life. However, the density of the polyurethane material of polyurethane leather cloth is relatively high, which makes the air permeability and heat dissipation of polyurethane leather cloth poor, and the cooling feeling is greatly reduced. It does not have the cooling feeling of ordinary ice-feeling fabrics, so it needs to be improved. Summary of the invention

[0004] In order to solve the problems of poor air permeability, heat dissipation and cooling feeling of polyurethane leather cloth, the present application provides a preparation process of leather cloth with cooling feeling and its product.

[0005] In a first aspect, the present application provides a process for preparing a leather cloth having a cool feeling, using the following technical solution: A process for preparing a leather cloth having a cool feeling, comprising the following preparation steps:

[0006] S1, mixing chitosan, polylactic acid, polyurethane, paraffin, nano silicon dioxide, heat dissipation filler, hydroxypropyl methylcellulose, silane coupling agent, anti-ultraviolet agent and silicone oil to prepare a mixture;

[0007] S2, putting the mixture obtained in step S1 into a twin-screw extruder, and then passing through the steps of spinneret extrusion, cooling, drawing, oiling, drying and winding to obtain a cool fiber;

[0008] S3, preparing the cool feeling fiber through a non-woven process to obtain a leather cloth with a cool feeling.

[0009] By adopting the above technical scheme, the leather cloth prepared has the texture of genuine leather and at the same time has good cooling feeling, air permeability and moisture permeability, and can be used to prepare clothing, bedding and household items that directly contact the skin.

[0010] Among them, the use of chitin to prepare cool feeling fibers can improve the silkiness and air permeability, but the silk-forming strength is poor, therefore, polylactic acid is added in the present application to cooperate with chitin for use, so that the ice-feeling fiber line has good silkiness, softness and strength, and at the same time, the texture of the leather cloth is more similar to the texture of the leather. The hardness of polyurethane is high, and the touch is too different from the leather. The softness and ductility of polylactic acid are good, and the hardness of polyurethane can be greatly reduced by sharing with polyurethane. Therefore, chitin, polylactic acid and polyester are used as the main raw materials for preparing cool feeling fibers in the present application, which can enhance the flexibility, air permeability and hygroscopicity of cool feeling fibers, further improve the flexibility, air permeability and hygroscopicity of leather cloth, and improve the cool feeling of leather cloth. At the same time, through the effect of heat dissipation filler, the leather cloth can quickly take away the heat, greatly improving the cool feeling of leather cloth. Hydroxypropyl methylcellulose has good hydrophilicity. When used together with polyurethane, it can further improve the water absorption of the ice-sensing fiber, greatly improve the water absorption of the leather cloth, accelerate the absorption of heat, and increase the cool feeling of the leather cloth.

[0011] At the same time, in order to further improve the smoothness of the cool fiber, the present application adds nano-silicon dioxide, which will combine with polylactic acid and polyurethane under the action of a silane coupling agent to improve the smoothness of the leather cloth.

[0012] The addition of paraffin wax in this application improves the fluidity of the system, so that silica, heat dissipation filler, chitin, polylactic acid and polyester can be fully mixed and evenly mixed, thereby improving the overall performance of the ice-sensing fiber. Silicone oil can further improve the softness and coolness of the ice-sensing fiber, making the leather cloth softer and cooler.

[0013] Preferably, the weight parts of the raw materials used in step S1 are as follows:

[0014] Chitosan 10-15 parts

[0015] Polylactic acid 15-20 parts

[0016] Polyurethane 40-50 parts

[0017] Silicone oil 5-10 parts

[0018] 4-8 parts paraffin

[0019] Nano silicon dioxide 5-10 parts

[0020] 25-50 parts of heat dissipation filler

[0021] Hydroxypropyl methylcellulose 10-20 parts

[0022] Silane coupling agent 1-2 parts

[0023] 1-2 parts of UV protection agent.

[0024] By adopting the above technical solution, the amount of raw materials for preparing ice-sensing fibers is optimized, thereby further improving the cool feeling, air permeability, moisture absorption and heat dissipation of the leather cloth, and making the texture of the leather layer closer to genuine leather.

[0025] Preferably, the weight ratio of the chitosan, the polylactic acid and the polyurethane is 10:18:45.

[0026] By adopting the above technical solution, the dosage of chitin, polylactic acid and polyurethane is further optimized, the softness and breathability and moisture absorption of the leather cloth are improved, the cool feeling of the leather cloth is increased, and at the same time the texture of the leather cloth is made closer to genuine leather.

[0027] Preferably, the molecular weight of the polylactic acid is 500-5000.

[0028] By adopting the above technical solution, the softness of the leather cloth is further improved, making the softness of the leather cloth closer to that of genuine leather.

[0029] Preferably, the silicone oil is organic silicone oil and / or alkyl silicone oil.

[0030] By adopting the above technical solution and optimizing the type of silicone oil, the softness and cool feeling of the leather cloth can be further improved, while the touch of the leather cloth can be increased, making the touch of the leather cloth closer to genuine leather.

[0031] Preferably, the heat dissipation filler is prepared by mixing mica powder, diatomaceous earth powder and graphene in a weight ratio of (5-10): (10-15):3.

[0032] By adopting the above technical solution, the type and amount of heat dissipation fillers are optimized, so that the heat dissipation performance of the leather cloth is further improved, the stuffiness of the human body is reduced, and the cool feeling of the leather cloth is improved. Among them, the mica powder has a high water content, which can drive the cooling effect, diatomaceous earth can accelerate the absorption of flowing water, thereby quickly taking away heat, and graphene can accelerate the absorption of heat. The three work together to improve the cool feeling of the leather cloth.

[0033] Preferably, the stretching step in step S2 is divided into a first stretching and a second stretching, the first stretching temperature is 150-170° C., the stretching ratio is 2-2.4, the second stretching temperature is 110-125° C., the stretching ratio is 3-3.5.

[0034] By adopting the above technical solution, the number of stretching times, temperature and multiples are optimized, so that the ice-sensing fiber has good softness and toughness. Only one stretching requires a higher temperature, which makes the ice-sensing fiber easy to break. By adopting two stretchings, the stretching temperature can be lowered, which can effectively avoid the breakage during the stretching process.

[0035] Preferably, after step S3, the leather cloth having a cool feeling is subjected to a dipping treatment, and the specific steps are as follows:

[0036] The leather cloth having a cool feeling is immersed in the polyurethane glue solution for 60-120 minutes, and then heat-cured to obtain a finished product;

[0037] Wherein, the polyurethane glue is prepared from the following raw materials in parts by weight:

[0038] Activated carbon 5-10 parts

[0039] Active diluent 50-70 parts

[0040] Polyurethane resin 10-20 parts

[0041] Hydrogel 10-15 parts

[0042] Chitosan 5-8 parts

[0043] 1-2 parts of curing agent

[0044] 1-2 parts of antibacterial agent.

[0045] By adopting the above technical solution, the texture of the leather cloth is close to that of genuine leather, and at the same time, the heat dissipation performance of the leather cloth can be enhanced, and the cool feeling of the leather cloth can be improved. The polyurethane glue contains activated carbon and hydrogel. The activated carbon can improve the heat dissipation performance of the leather cloth, and the hydrogel can absorb a large amount of water, which can accelerate the absorption of heat and make the human body feel cool. Under the dual effects of activated carbon and hydrogel, the cool feeling of the leather layer is greatly improved.

[0046] At the same time, through the action of the curing agent, the polyurethane glue can stably and firmly adhere to the surface of the leather cloth, will not fall off during use, and maintain a good cool feeling for a long time.

[0047] In a second aspect, the present application provides a leather cloth having a cool feeling, which adopts the following technical solution:

[0048] A leather cloth with a cool feeling is prepared by the preparation process of the leather cloth with a cool feeling described in the first aspect.

[0049] By adopting the above technical solution, the leather cloth prepared has good softness and cool feeling, and the texture is closer to genuine leather.

[0050] In summary, this application has the following beneficial effects:

[0051] 1. In the present application, cool fibers are prepared from chitosan, polylactic acid, polyurethane, paraffin, nano-silicon dioxide, heat dissipation filler, hydroxypropyl methylcellulose, silane coupling agent, UV inhibitor and silicone oil, and then the cool fibers are processed through a non-woven process to obtain leather cloth. The leather cloth has good coolness and softness, and its texture is closer to that of genuine leather.

[0052] 2. The present application prepares a polyurethane glue solution using activated carbon, active diluent, polyurethane resin, hydrogel, chitosan, curing agent and antibacterial agent, so that the surface texture of the leather cloth is closer to that of genuine leather. At the same time, under the action of hydrogel and activated carbon, the cool feeling and softness of the leather cloth are further improved. DETAILED DESCRIPTION

[0053] Example

[0054] The polyurethane in this application was purchased from Ningbo Hanyuan Plastic Chemical Co., Ltd. with a brand number of 9390AU.

[0055] Example 1

[0056] A leather cloth with a cool feeling is prepared by the following method:

[0057] S1, chitosan 100g, polylactic acid 150g, polyurethane 400g, paraffin 40g, nano silicon dioxide 50g, heat dissipation filler 250g (mica), hydroxypropyl methylcellulose 100g, silane coupling agent 10g (γ-mercaptopropyl triethoxysilane), anti-ultraviolet agent 10g (ultraviolet absorber UV-928) and silicone oil 50g, mix to prepare a mixture, the mixing temperature is 220 ℃; S2, the mixture prepared in step S1 is put into a twin-screw extruder, and then through spinneret extrusion, cooling, drawing, oiling, drying and winding steps to prepare a cool fiber, the drawing step is divided into a first drawing and a second drawing, the temperature of the first drawing is 150 ℃, the drawing multiple is 2, the temperature of the second drawing is 110 ℃, the drawing multiple is 3;

[0058] S3, preparing the cool feeling fiber through a non-woven process to obtain a leather cloth with a cool feeling.

[0059] The molecular weight of polylactic acid is 500.

[0060] The silicone oil is cyclic dimethyl silicone oil purchased from Wuhan Kemik Biopharmaceutical Technology Co., Ltd., with a viscosity of 4 mm at 25 °C. 2 / s.

[0061] The difference between Example 2-3 and Example 1 is that the types, amounts and parameters of some raw materials for preparing the leather cloth with a cool feeling are different. The specific differences are shown in Table 1:

[0062] Table 1: Types, amounts and parameters of raw materials for preparing leather cloth with cool feeling in Examples 1-3

[0063]

[0064]

[0065] The silicone oil in Example 2 is a long-chain alkyl silicone oil purchased from Wuhan Kemik Biopharmaceutical Technology Co., Ltd.

[0066] The silicone oil in Example 3 includes 25 g of cyclic dimethyl silicone oil and 25 g of long-chain alkyl silicone oil.

[0067] Example 4

[0068] A leather cloth with a cool feeling. The difference between this embodiment and embodiment 1 is that the weight ratio of chitosan 88g, polylactic acid 159g and polyurethane 400g is 10:18:45, and the types, amounts and experimental parameters of other raw materials are consistent with those in embodiment 1.

[0069] Example 5

[0070] A leather cloth with a cool feeling. The difference between this embodiment and embodiment 1 is that the heat dissipation filler is prepared by mixing 69g of mica powder, 139g of diatomaceous earth powder and 42g of graphene in a weight ratio of 5:10:3, and the types, amounts and experimental parameters of other raw materials are consistent with those in embodiment 1.

[0071] Example 6

[0072] A leather cloth with a cool feeling. The difference between this embodiment and embodiment 1 is that the heat dissipation filler is prepared by mixing 89g of mica powder, 134g of diatomaceous earth powder and 27g of graphene in a weight ratio of 10:15:3, and the types, amounts and experimental parameters of other raw materials are consistent with those in embodiment 1.

[0073] Example 7

[0074] A leather cloth with a cool feeling. The difference between this embodiment and embodiment 5 is that the heat dissipation filler is prepared by mixing 83g of mica powder, 83g of diatomaceous earth powder and 83g of graphene in a weight ratio of 10:10:10, and the types, amounts and experimental parameters of other raw materials are consistent with those in embodiment 5.

[0075] Example 8

[0076] A leather cloth with a cool feeling. The difference between this embodiment and embodiment 5 is that talcum powder is used instead of an equal amount of graphene, and the types, amounts and experimental parameters of other raw materials are consistent with those of embodiment 5.

[0077] Example 9

[0078] A leather cloth with a cool feeling. The difference between this embodiment and embodiment 5 is that talcum powder is used instead of an equal amount of diatomaceous earth powder, and the types, amounts and experimental parameters of other raw materials are consistent with those of embodiment 5.

[0079] Example 10

[0080] A leather cloth with a cool feeling. The difference between this embodiment and embodiment 1 is that after step S3, the leather cloth with a cool feeling is dipped in glue. The specific steps are as follows:

[0081] The leather cloth having a cool feeling is immersed in the polyurethane glue solution for 60 minutes, and then heat-cured at a curing temperature of 60°C to obtain a finished product;

[0082] The polyurethane adhesive is prepared from the following raw materials in parts by weight:

[0083] Activated carbon 50g

[0084] Reactive diluent 500g (isobornyl methacrylate)

[0085] Polyurethane resin 100g

[0086] Hydrogel 100g

[0087] Chitosan 50g

[0088] Curing agent 10g (toluene diisocyanate)

[0089] Antibacterial agent 10g (nano silver antibacterial powder).

[0090] The polyurethane resin used in the examples of the present application was purchased from Hubei Langbowan Biopharmaceutical Co., Ltd. with a CAS number of 61788-97-4.

[0091] The chitosan used in the examples of the present application was purchased from Huantai County Jinhu Crust Products Co., Ltd. and was of high quality.

[0092] The hydrogel used in the examples of the present application was purchased from Henan Fengquan Water Treatment Materials Co., Ltd., and the EINECS registration number is 231-545-4.

[0093] Embodiment 11

[0094] A leather cloth with a cool feeling. The difference between this embodiment and embodiment 5 is that after step S3, the leather cloth with a cool feeling is dipped in glue. The specific steps are as follows:

[0095] The leather cloth having a cool feeling is immersed in the polyurethane glue solution for 90 minutes, and then heat-cured at a curing temperature of 65°C to obtain a finished product;

[0096] The polyurethane adhesive is prepared from the following raw materials in parts by weight:

[0097] Activated carbon 70g

[0098] Reactive diluent 600g (ethoxylated trimethylolpropane triacrylate)

[0099] Polyurethane resin 150g

[0100] Hydrogel 120g

[0101] Chitosan 60g

[0102] Curing agent 15g (toluene diisocyanate)

[0103] Antibacterial agent 15g (nano silver antibacterial powder).

[0104] Example 12

[0105] A leather cloth with a cool feeling. The difference between this embodiment and embodiment 3 is that after step S3, the leather cloth with a cool feeling is dipped in glue. The specific steps are as follows:

[0106] The leather cloth having a cool feeling is immersed in the polyurethane glue solution for 120 minutes, and then heat-cured at a curing temperature of 70°C to obtain a finished product;

[0107] The polyurethane adhesive is prepared from the following raw materials in parts by weight:

[0108] Activated carbon 70g

[0109] Reactive diluent 700g (isobornyl acrylate)

[0110] Polyurethane resin 200g

[0111] Hydrogel 120g

[0112] Chitosan 80g

[0113] Curing agent 20g (toluene diisocyanate)

[0114] Antibacterial agent 20g (nano silver antibacterial powder).

[0115] Example 13

[0116] A leather cloth with a cool feeling. The difference between this embodiment and embodiment 10 is that silicon dioxide is used instead of activated carbon of equal mass, and the types, amounts and experimental parameters of other raw materials are consistent with those of embodiment 10.

[0117] Embodiment 14

[0118] A leather cloth with a cool feeling. The difference between this embodiment and embodiment 10 is that silicon dioxide is used instead of hydrogel of equal mass, and the types, amounts and experimental parameters of other raw materials are consistent with those of embodiment 10.

[0119] Embodiment 15

[0120] A leather cloth with a cool feeling. The difference between this embodiment and embodiment 10 is that silicon dioxide is used instead of chitosan of equal mass, and the types, amounts and experimental parameters of other raw materials are consistent with those of embodiment 10.

[0121] Comparative Example

[0122] Comparative Example 1

[0123] A leather cloth with a cool feeling. The difference between this comparative example and Example 1 is that polyester chips are used to replace polylactic acid, and the types, amounts and experimental parameters of other raw materials are consistent with those of Example 1.

[0124] The polyester chips were purchased from Anhui Longyang Environmental Protection Technology Co., Ltd. and the environmental protection grade is food grade.

[0125] Comparative Example 2

[0126] A leather cloth with a cool feeling. The difference between this comparative example and Example 1 is that chitosan is used to replace chitosan, and the types, amounts and experimental parameters of other raw materials are consistent with those in Example 1.

[0127] Chitosan was purchased from Wuhan Woxuan Technology Co., Ltd. with a CAS number of 9012-76-4.

[0128] Comparative Example 3

[0129] A leather cloth with a cool feeling. The difference between this comparative example and Example 1 is that polyvinyl alcohol is used to replace hydroxypropyl methylcellulose, and the types, amounts and experimental parameters of other raw materials are consistent with those of Example 1.

[0130] The molecular weight of polyvinyl alcohol is 2000.

[0131] Comparative Example 4

[0132] A leather cloth with a cool feeling. The difference between this comparative example and Example 1 is that stearic acid is used to replace silicone oil, and the types, amounts and experimental parameters of other raw materials are consistent with those of Example 1.

[0133] Comparative Example 5

[0134] A leather cloth with a cool feeling. The difference between this comparative example and Example 1 is that stearic acid is used to replace paraffin, and the types, amounts and experimental parameters of other raw materials are consistent with those in Example 1.

[0135] Comparative Example 6

[0136] A leather cloth with a cool feeling. The difference between this comparative example and Example 1 is that talcum powder is used to replace nano silicon dioxide, and the types, amounts and experimental parameters of other raw materials are consistent with those of Example 1.

[0137] Performance testing

[0138] The leather cloths with a cool feeling prepared in Examples 1-15 and Comparative Examples 1-6 were tested for a sense of contact similarity to genuine leather, a softness test, and a cool feeling performance test.

[0139] Detection method / test method

[0140] The thickness of the cool leather cloth prepared in this application is the same, which is 1 mm.

[0141] Test of similarity to genuine leather: First-layer genuine cowhide was purchased from Foshan Yicheng Leather Co., Ltd. as a blank control sample. 500 people aged 20-50 were randomly selected and asked to touch the first-layer genuine cowhide, the leather cloth with a cool feeling prepared by Examples 1-15 and Comparative Examples 1-6, and the number of people who believed that the leather cloth with a cool feeling had a touch similar to that of the first-layer genuine cowhide was counted.

[0142] Softness test: The test was conducted using the GT-303 leather softness tester produced by Gaotie Testing Instrument (Dongguan) Co., Ltd. according to the manufacturer's instructions.

[0143] Cooling performance test: refer to GB / T 35263-2017 "Testing and evaluation of instantaneous cooling performance of textiles". The experimental data are shown in Table 2:

[0144] Table 2 Experimental data of Examples 1-15 and Comparative Examples 1-6

[0145]

[0146]

[0147] From Examples 1-15 and Comparative Examples 1-6 in combination with Table 2, it can be seen that the leather cloth prepared by the preparation process in the present application has good softness and cool feeling, and its texture is close to that of the first layer of genuine cowhide.

[0148] By comparing Example 1 with Comparative Example 1, the number of people in the test of similarity to leather contact of Comparative Example 1 is 403, the test of softness is 6.5, and the coolness coefficient in the coolness performance test is 0.194 W / cm 2 The comprehensive performance of Comparative Example 1 is not as good as that of Example 1;

[0149] By comparing Example 1 with Comparative Example 2, the number of people in the test of similarity to leather contact in Comparative Example 2 is 412, and the coolness coefficient in the coolness performance test is 0.202 W / cm 2 The texture and cool feeling in Comparative Example 2 are not as good as those in Example 1;

[0150] By comparing Example 1 with Comparative Example 3, the number of people in the test of similarity to leather contact in Comparative Example 3 is 408, and the coolness coefficient in the coolness performance test is 0.209 W / cm 2 , the texture and cool feeling in comparative example 3 are not as good as those in example 1;

[0151] By comparing Example 1 with Comparative Examples 4-6, the number of people in the test of similarity to leather contact of Comparative Examples 4-6 were 396, 409, and 415, respectively, the softness test was 5, 6, and 5.5, respectively, and the coolness coefficient in the coolness performance test was 0.191 W / cm 2 、0.198W / cm 2 , 0.212W / cm 2 The comprehensive performances of Comparative Examples 4-6 are not as good as those of Example 1;

[0152] It can be seen from Example 1 and Comparative Examples 1-6 that in the present application, cool fibers are prepared by combining chitosan, polylactic acid, paraffin, nano-silicon dioxide, hydroxypropyl methylcellulose, silicone oil and other raw materials, and then the cool fibers are used to prepare leather cloth, so that the leather cloth has good softness and cool feeling, and at the same time has a texture similar to the first layer of genuine cowhide.

[0153] By comparing Example 1 with Examples 5-6, the number of people in the test of similarity to leather contact of Examples 5-6 was 459 and 458 respectively, and the cooling coefficient in the cooling performance test was 0.242 W / cm 2 , 0.243W / cm 2 , the texture and cool feeling in Examples 5-6 are better than that in Example 1;

[0154] Compared with Example 7-9, the number of people in the test of similarity to leather contact of Example 5 was 452, 465 and 440 respectively, the softness test was 5, 6 and 5.5 respectively, and the cooling coefficient in the cooling performance test was 0.226 W / cm 2 , 0.221W / cm 2 , 0.231W / cm 2 , the texture and cool feeling in Examples 7-9 are not as good as in Example 5;

[0155] From Examples 1, 5, and 7-9, it can be seen that by mixing mica powder, diatomaceous earth powder, and graphene according to specific weights, the cool feeling and texture of the leather cloth can be further improved.

[0156] By comparing Example 1 with Example 10, Example 2 with Example 11, and Example 3 with Example 12, the number of people in the test of similarity to genuine leather contact in Examples 10-12 increased significantly, and the softness and cool feeling were significantly improved;

[0157] Comparing Example 10 with Examples 13-15, the number of people in the test of similarity to genuine leather in Examples 13-15 was significantly reduced, and the softness and cooling feeling were significantly reduced;

[0158] Examples 1, 10, 13-15 illustrate that the polyurethane glue prepared by using activated carbon, active diluent, polyurethane resin, hydrogel, chitosan, curing agent and antibacterial agent can further improve the softness, cool feeling and texture of leather cloth.

[0159] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A process for preparing a leather cloth having a cool feeling, characterized in that: The method comprises the following preparation steps: S1, mixing chitosan, polylactic acid, polyurethane, paraffin, nano silicon dioxide, heat dissipation filler, hydroxypropyl methylcellulose, silane coupling agent, anti-ultraviolet agent and silicone oil to prepare a mixture; S2, putting the mixture obtained in step S1 into a twin-screw extruder, and then passing through the steps of spinneret extrusion, cooling, drawing, oiling, drying and winding to obtain a cool fiber; S3, preparing a leather cloth having a cool feeling by using a non-woven process to produce the cool feeling fiber; The weight parts of the raw materials used in step S1 are as follows: Chitosan 10-15 parts Polylactic acid 15-20 parts Polyurethane 40-50 parts Silicone oil 5-10 parts 4-8 parts paraffin Nano silicon dioxide 5-10 parts 25-50 parts of heat dissipation filler Hydroxypropyl methylcellulose 10-20 parts Silane coupling agent 1-2 parts 1-2 parts of UV protection agent.

2. The process for preparing a leather cloth having a cool feeling according to claim 1, characterized in that: The weight ratio of the chitosan, the polylactic acid and the polyurethane is 10:18:

45.

3. The process for preparing a leather cloth having a cool feeling according to claim 1, characterized in that: The molecular weight of the polylactic acid is 500-5000.

4. The process for preparing a leather cloth having a cool feeling according to claim 1, characterized in that: The silicone oil is organic silicone oil and / or alkyl silicone oil.

5. The process for preparing a leather cloth having a cool feeling according to claim 1, characterized in that: The heat dissipation filler is prepared by mixing mica powder, diatomaceous earth powder and graphene in a weight ratio of (5-10): (10-15):

3.

6. The process for preparing a leather cloth having a cool feeling according to claim 1, characterized in that: In step S2, the stretching step is divided into a first stretching and a second stretching. The temperature of the first stretching is 150-170° C., and the stretching ratio is 2-2.

4. The temperature of the second stretching is 110-125° C., and the stretching ratio is 3-3.

5.

7. The process for preparing a leather cloth having a cool feeling according to claim 1, characterized in that: After step S3, the leather cloth having a cool feeling is subjected to a dipping treatment, and the specific steps are as follows: The leather cloth having a cool feeling is immersed in the polyurethane glue solution for 60-120 minutes, and then heat-cured to obtain a finished product; Wherein, the polyurethane glue is prepared from the following raw materials in parts by weight: Activated carbon 5-10 parts Active diluent 50-70 parts Polyurethane resin 10-20 parts Hydrogel 10-15 parts Chitosan 5-8 parts 1-2 parts of curing agent 1-2 parts of antibacterial agent.

8. The process for preparing a leather cloth having a cool feeling according to claim 7, characterized in that: The thermal curing temperature is 60-70°C.

9. A leather cloth having a cool feeling, characterized in that: The leather cloth with a cool feeling is prepared by the preparation process of the leather cloth with a cool feeling according to any one of claims 1 to 8.

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