Leather with excellent wear resistance and scratch resistance and preparation method thereof

Abstract

The invention relates to the field of leather products, in particular to leather with excellent wear resistance and scratch resistance and a preparation method thereof, which are used for solving the problems that the existing leather products are easy to be worn and scratched due to poor wear resistance and scratch resistance and are difficult to meet some application scenes with higher requirements on the wear resistance of the leather. According to the preparation method, the film-forming emulsion is used as a main raw material to form the wear-resistant and scratch-resistant protective layer, the comprehensive performance of the wear-resistant and scratch-resistant protective layer can be enhanced by adding the composite reinforcing filler into the wear-resistant and scratch-resistant protective layer, and the leather can be effectively protected under the synergistic effect of the composite reinforcing filler and the wear-resistant and scratch-resistant protective layer, so that the prepared leather has excellent wear-resistant and scratch-resistant performance; according to the present invention, the scratch-resistant leather material has characteristics of high scratch resistance, low scratch damage, good durability and good environmental adaptability, and can maintain the integrity of the leather structure so as to maintain the good comfort and the good aesthetic property; moreover, the preparation method is simple in process, easy to operate and suitable for large-scale industrial production.

Description

Technical Field

[0001] The present invention relates to the field of leather products, and particularly to a leather with excellent wear resistance and scratch resistance and a preparation method thereof. Background Art

[0002] As a traditional natural material, leather has excellent softness and texture and is widely used in various product fields such as shoes, clothing, wallets, etc. However, traditional leather products are prone to wear and scratches during long-term use, resulting in scratches, wear, and even damage on the surface, affecting their appearance and service life.

[0003] In order to improve the wear resistance and scratch resistance of leather, a method of coating a coating on the leather surface is usually adopted. At present, common leather coating materials mainly include polyurethane, polyacrylate, etc. However, these traditional coating materials still have certain limitations in terms of wear resistance and scratch resistance and are difficult to meet some application scenarios with high requirements for leather wear resistance. Therefore, a leather with excellent wear resistance and scratch resistance and a preparation method thereof have important practical significance. Summary of the Invention

[0004] In order to overcome the above technical problems, the purpose of the present invention is to provide a leather with excellent wear resistance and scratch resistance and a preparation method thereof, which solves the problem that the existing leather products have poor wear resistance and scratch resistance, resulting in easy wear and scratches and being difficult to meet some application scenarios with high requirements for leather wear resistance.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A leather with excellent wear resistance and scratch resistance, comprising the following components in parts by weight:

[0007] 65 - 85 parts of film-forming emulsion, 4 - 12 parts of composite reinforcing filler, 2 - 4 parts of film-forming aid, 1 - 3 parts of thickener, 0.8 - 1.2 parts of cross-linking agent, 0.5 - 0.9 parts of defoaming agent, and 0.2 - 0.4 parts of leveling agent;

[0008] Among them, the film-forming emulsion is prepared by the following steps:

[0009] Step a1: Add perfluorohexylethyl alcohol, methacrylic acid, hydroquinone, p-toluenesulfonic acid, and anhydrous toluene into a three-necked flask equipped with a stirrer, thermometer, gas pipe, and reflux condenser. Introduce nitrogen for protection. Stir and react for 10 - 20 min under the conditions of a temperature of 20 - 25°C and a stirring rate of 200 - 300 r / min. Then, raise the temperature to 80 - 85°C and continue to stir and react for 4 - 5 h. Subsequently, raise the temperature to 90 - 100°C and continue to stir and react for 2 - 3 h. After the reaction is completed, cool the reaction product to room temperature. Then, wash it 3 - 5 times successively with sodium hydroxide solution and saturated brine, dry it with anhydrous magnesium sulfate, and then perform vacuum filtration. Rotate and evaporate the filtrate to remove the solvent to obtain a polyfluorinated monomer.

[0010] Step a2: Add the polyfluorinated monomer, methyl methacrylate, butyl acrylate, glycidyl methacrylate, 2-hydroxyethyl methacrylate, emulsifier, and deionized water into a three-necked flask equipped with a stirrer, thermometer, gas pipe, and constant pressure dropping funnel. Introduce nitrogen for protection. Stir and react for 10 - 20 min under the conditions of a temperature of 25 - 30°C and a stirring rate of 200 - 300 r / min. Then, raise the temperature to 85 - 90°C and gradually add the ammonium persulfate solution dropwise while stirring, controlling the dropping rate at 1 - 2 drops / s. After the dropping is completed, continue to stir and react for 3 - 5 h. After the reaction is completed, cool the reaction product to room temperature to obtain a film-forming emulsion.

[0011] As a further scheme of the present invention: The dosage ratio of the perfluorohexylethyl alcohol, methacrylic acid, hydroquinone, p-toluenesulfonic acid, and anhydrous toluene in step a1 is 10 mmol: 10 mmol: 0.1 - 0.2 g: 0.8 - 1 g: 80 - 90 mL.

[0012] As a further scheme of the present invention: The mass fraction of the sodium hydroxide solution in step a1 is 5 - 6%.

[0013] As a further scheme of the present invention: The dosage ratio of the polyfluorinated monomer, methyl methacrylate, butyl acrylate, glycidyl methacrylate, 2-hydroxyethyl methacrylate, emulsifier, deionized water, and ammonium persulfate solution in step a2 is 3 - 9 g: 20 - 25 g: 10 - 12 g: 5.5 - 10.5 g: 3 - 5 g: 0.8 - 1.2 g: 100 - 110 mL: 20 - 22 mL.

[0014] As a further scheme of the present invention: The emulsifier in step a2 is a mixture of sodium dodecyl sulfate and emulsifier op-10 in a mass ratio of 1:1; the mass fraction of the ammonium persulfate solution is 3 - 5%.

[0015] As a further scheme of the present invention: The composite reinforcing filler is prepared by the following steps:

[0016] Step b1: Add basalt fiber, petroleum ether, and absolute ethanol into a three-necked flask equipped with a stirrer and a thermometer. Under the condition of an ultrasonic power of 200 - 300 W, perform ultrasonic treatment for 30 - 50 min. Then, under the conditions of a temperature of 25 - 30 °C and a stirring rate of 200 - 300 r / min, carry out a stirring reaction for 3 - 5 h. After the reaction ends, centrifuge the reaction product, then wash the precipitate with distilled water 3 - 5 times. After that, place it in a vacuum drying oven and dry it for 1 - 2 h under the condition of a temperature of 80 - 85 °C to obtain pretreated basalt fiber;

[0017] Step b2: Add ammonium molybdate tetrahydrate, thiourea, polyethylene glycol, and deionized water into a three-necked flask equipped with a stirrer and a thermometer. Under the conditions of a temperature of 25 - 30 °C and a stirring rate of 200 - 300 r / min, carry out a stirring reaction for 30 - 50 min. Then, add the pretreated basalt fiber and raise the temperature to 190 - 210 °C for a hydrothermal reaction for 15 - 20 h. After the reaction ends, cool the reaction product to room temperature, then centrifuge and wash the precipitate with absolute ethanol and distilled water 3 - 5 times respectively. After that, place it in a vacuum drying oven and dry it for 3 - 5 h under the condition of a temperature of 60 - 65 °C to obtain molybdenum disulfide-coated basalt fiber;

[0018] Step b3: Add absolute ethanol into a three-necked flask equipped with a stirrer and a thermometer, adjust the pH to 9 - 10 with an ammonia water solution. Then, add the molybdenum disulfide-coated basalt fiber and carry out a stirring reaction for 10 - 20 min under the conditions of a temperature of 25 - 30 °C and a stirring rate of 200 - 300 r / min. Then, add isocyanatopropyltriethoxysilane and raise the temperature to 80 - 85 °C to continue the stirring reaction for 5 - 6 h. After the reaction ends, cool the reaction product to room temperature, then centrifuge and wash the precipitate with distilled water 3 - 5 times. After that, place it in a vacuum drying oven and dry it for 3 - 5 h under the condition of a temperature of 50 - 55 °C to obtain a composite reinforcing filler.

[0019] As a further scheme of the present invention: The dosage ratio of the basalt fiber, petroleum ether, and absolute ethanol in step b1 is 5 g : 20 - 25 mL : 20 - 25 mL.

[0020] As a further scheme of the present invention: The average length of the basalt fiber in step b1 is 1 mm and the average diameter is 3 μm.

[0021] As a further scheme of the present invention: The dosage ratio of the ammonium molybdate tetrahydrate, thiourea, polyethylene glycol, deionized water, and pretreated basalt fiber in step b2 is 0.3679 g : 0.6786 g : 6 - 8 mL : 80 - 90 mL : 5 g.

[0022] As a further solution of the present invention: the polyethylene glycol in step b2 is PEG-400.

[0023] As a further solution of the present invention: the dosage ratio of the absolute ethanol, molybdenum disulfide-coated basalt fiber and isocyanatopropyltriethoxysilane in step b3 is 70-80 mL: 5 g: 2-10 g.

[0024] As a further solution of the present invention: the mass fraction of the ammonia water solution in step b3 is 10-12%.

[0025] As a further solution of the present invention: a method for preparing a leather with excellent wear resistance and scratch resistance, comprising the following steps:

[0026] Step 1: Weigh 65-85 parts of film-forming emulsion, 4-12 parts of composite reinforcing filler, 2-4 parts of film-forming aid, 1-3 parts of thickener, 0.8-1.2 parts of cross-linking agent, 0.5-0.9 parts of defoaming agent and 0.2-0.4 parts of leveling agent by weight, and set aside;

[0027] Step 2: Add the film-forming emulsion, composite reinforcing filler, film-forming aid, thickener, cross-linking agent, defoaming agent and leveling agent to a mixer, and stir and mix at a temperature of 25-30 °C and a stirring rate of 800-1000 r / min for 30-40 min to obtain a wear-resistant and scratch-resistant slurry;

[0028] Step 3: Spray the wear-resistant and scratch-resistant slurry on the leather surface, then put the sprayed leather into a vacuum drying oven, dry and cure it at a temperature of 60-70 °C for 1-2 h, and then raise the temperature to 90-100 °C and continue to dry and cure it for 30-40 min to obtain a leather with excellent wear resistance and scratch resistance.

[0029] As a further solution of the present invention: the film-forming aid is propylene glycol butyl ether.

[0030] As a further solution of the present invention: the thickener is hydroxyethyl cellulose.

[0031] As a further solution of the present invention: the cross-linking agent is aziridine cross-linking agent.

[0032] As a further solution of the present invention: the defoaming agent is TEGO825 defoaming agent.

[0033] As a further solution of the present invention: the leveling agent is BYK-306 leveling agent.

[0034] The beneficial effects of the present invention:

[0035] A leather with excellent wear and scratch resistance and its preparation method of the present invention. By stirring and mixing a film-forming emulsion, a composite reinforcing filler, a film-forming aid, a thickener, a cross-linking agent, an antifoaming agent and a leveling agent, a wear and scratch resistant slurry is obtained. The wear and scratch resistant slurry is sprayed on the leather surface and then dried and cured to obtain a leather with excellent wear and scratch resistance. The preparation method uses the film-forming emulsion as the main raw material to form a wear and scratch resistant protective layer. Adding a composite reinforcing filler to it can enhance the comprehensive performance of the wear and scratch resistant protective layer. Under the synergistic effect of the two, the leather can be effectively protected, so that the prepared leather not only has excellent wear and scratch resistance and reduces the damage during scratching, but also has good durability and environmental adaptability, maintains the integrity of the leather structure, and thus maintains good comfort and aesthetics. Moreover, the preparation method has a simple process, is easy to operate, and is suitable for large-scale industrial production.

[0036] In the process of preparing the leather with excellent wear and scratch resistance, a film-forming emulsion is first prepared. Using perfluorohexylethyl alcohol and methacrylic acid to react, the hydroxyl group on perfluorohexylethyl alcohol reacts with the carboxyl group on methacrylic acid to obtain a polyfluoro monomer. Then, using the polyfluoro monomer, methyl methacrylate, butyl acrylate, glycidyl methacrylate and 2-hydroxyethyl methacrylate as polymerization monomers for polymerization to form a fluorinated polyacrylate polymer, and a film-forming emulsion is obtained. The film-forming emulsion has good film-forming property and adhesion, can form a wear and scratch resistant protective layer tightly combined with the leather matrix, and uses a large number of fluorine atoms to significantly reduce the surface energy of the wear and scratch resistant protective layer, thereby reducing the adhesion force and the friction force also decreases, thus reducing the possibility of being scratched and worn on the surface of the wear and scratch resistant protective layer, and then realizing the effective protection of the leather matrix and enhancing the wear and scratch resistance of the leather.

[0037] In the process of preparing leather with excellent wear and scratch resistance, a composite reinforcing filler is also prepared. First, basalt fibers are pretreated to effectively remove impurities on their surfaces, obtaining pretreated basalt fibers. Then, ammonium molybdate tetrahydrate and thiourea are used as raw materials to coat the pretreated basalt fibers with molybdenum disulfide on their surfaces, obtaining molybdenum disulfide-coated basalt fibers. Finally, isocyanatopropyltriethoxysilane is used to modify the molybdenum disulfide-coated basalt fibers, obtaining the composite reinforcing filler. Basalt fibers have excellent mechanical properties such as high strength and high modulus, and can withstand and disperse externally applied loads. When the wear and scratch-resistant protective layer is subjected to friction or scratching, the basalt fibers can prevent the propagation and extension of cracks. At the same time, they can also improve the overall strength and toughness of the wear and scratch-resistant protective layer, making the wear and scratch-resistant protective layer not easily break and be damaged when subjected to external forces, thereby enhancing its wear and scratch resistance. Molybdenum disulfide loaded on the basalt fibers is a solid lubricant with a layered structure, and the binding force between its layers is weak and prone to relative sliding. During the friction process, molybdenum disulfide will form a lubricating film on the friction surface, thereby reducing the heat and wear generated during the friction process, and further reducing the scratching and wear of external objects on the wear and scratch-resistant protective layer. After being modified with isocyanatopropyltriethoxysilane, the dispersibility of the molybdenum disulfide-coated basalt fibers can be significantly improved, enabling them to be evenly distributed inside the wear and scratch-resistant protective layer, and introducing a large number of isocyanate groups, and then connecting them in the form of chemical bonds, enhancing the binding force between the two, avoiding the cracking phenomenon caused by poor interfacial bonding, and being able to more effectively transfer stress, thereby further improving the wear and scratch resistance of the wear and scratch-resistant protective layer and effectively protecting the leather. Detailed implementation mode

[0038] The following will combine the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0039] Example 1:

[0040] This example is a preparation method of leather with excellent wear and scratch resistance, including the following steps:

[0041] Step S1: Add 10 mmol of perfluorohexylethyl alcohol, 10 mmol of methacrylic acid, 0.1 g of hydroquinone, 0.8 g of p-toluenesulfonic acid, and 80 mL of anhydrous toluene into a three-necked flask equipped with a stirrer, a thermometer, a gas pipe, and a reflux condenser. Introduce nitrogen for protection. Stir and react for 10 min under the conditions of a temperature of 20°C and a stirring rate of 200 r / min. Then, raise the temperature to 80°C and continue to stir and react for 4 h. After that, raise the temperature to 90°C and continue to stir and react for 2 h. After the reaction is completed, cool the reaction product to room temperature. Then, wash it three times with a 5% sodium hydroxide solution by mass and saturated brine successively. Then, dry it with anhydrous magnesium sulfate. Then, perform vacuum filtration. Rotate and evaporate the filtrate to remove the solvent to obtain a polyfluoromonomer;

[0042] Step S2: Add 3 g of polyfluoromonomer, 20 g of methyl methacrylate, 10 g of butyl acrylate, 5.5 g of glycidyl methacrylate, 3 g of 2-hydroxyethyl methacrylate, 0.8 g of emulsifier, and 100 mL of deionized water into a three-necked flask equipped with a stirrer, a thermometer, a gas pipe, and a constant-pressure dropping funnel. Introduce nitrogen for protection. Stir and react for 10 min under the conditions of a temperature of 25°C and a stirring rate of 200 r / min. Then, raise the temperature to 85°C and gradually add 20 mL of a 3% ammonium persulfate solution by mass dropwise while stirring, controlling the dropping rate at 1 drop / s. After the dropping is completed, continue to stir and react for 3 h. After the reaction is completed, cool the reaction product to room temperature to obtain a film-forming emulsion;

[0043] Step S3: Add 5 g of basalt fibers with an average length of 1 mm and an average diameter of 3 μm, 20 mL of petroleum ether, and 20 mL of anhydrous ethanol into a three-necked flask equipped with a stirrer and a thermometer. Perform ultrasonic treatment for 30 min under the condition of an ultrasonic power of 200 W. Then, stir and react for 3 h under the conditions of a temperature of 25°C and a stirring rate of 200 r / min. After the reaction is completed, centrifuge the reaction product. Then, wash the precipitate three times with distilled water. Then, place it in a vacuum drying oven and dry it at 80°C for 1 h to obtain pretreated basalt fibers;

[0044] Step S4: Add 0.3679 g of ammonium molybdate tetrahydrate, 0.6786 g of thiourea, 6 mL of polyethylene glycol PEG-400, and 80 mL of deionized water into a three-necked flask equipped with a stirrer and a thermometer. Stir and react for 30 min under the conditions of a temperature of 25°C and a stirring rate of 200 r / min. Then, add 5 g of pretreated basalt fibers and carry out a hydrothermal reaction at 190°C for 15 h. After the reaction is completed, cool the reaction product to room temperature. Then, centrifuge and wash the precipitate three times with anhydrous ethanol and distilled water successively. Then, place it in a vacuum drying oven and dry it at 60°C for 3 h to obtain molybdenum disulfide-coated basalt fibers;

[0045] Step S5: Add 70 mL of absolute ethanol into a three-necked flask equipped with a stirrer and a thermometer, adjust the pH to 9 with a 10% ammonia aqueous solution by mass fraction, then add 5 g of molybdenum disulfide-coated basalt fibers and stir and react for 10 min under the conditions of a temperature of 25°C and a stirring rate of 200 r / min. Then add 2 g of isocyanatopropyltriethoxysilane and continue to stir and react for 5 h under the condition of heating to 80°C. After the reaction is completed, cool the reaction product to room temperature, then centrifuge and wash the precipitate with distilled water 3 times. Then place it in a vacuum drying oven and dry it for 3 h under the condition of a temperature of 50°C to obtain a composite reinforcing filler;

[0046] Step S6: Weigh 65 parts by weight of a film-forming emulsion, 4 parts of the composite reinforcing filler, 2 parts of a film-forming auxiliary agent, 1 part of a thickening agent, 0.8 part of a cross-linking agent, 0.5 part of an antifoaming agent, and 0.2 part of a leveling agent for standby; the film-forming auxiliary agent is propylene glycol butyl ether; the thickening agent is hydroxyethyl cellulose; the cross-linking agent is an aziridine cross-linking agent; the antifoaming agent is TEGO825 antifoaming agent; the leveling agent is BYK-306 leveling agent;

[0047] Step S7: Add the film-forming emulsion, the composite reinforcing filler, the film-forming auxiliary agent, the thickening agent, the cross-linking agent, the antifoaming agent, and the leveling agent into a mixer and stir and mix for 30 min under the conditions of a temperature of 25°C and a stirring rate of 800 r / min to obtain an abrasion-resistant and scratch-resistant slurry;

[0048] Step S8: Spray the abrasion-resistant and scratch-resistant slurry on the surface of blue wet cowhide leather with a thickness of 1.3 mm, control the coating thickness at 50 μm, then put the sprayed leather into a vacuum drying oven and dry and cure it for 1 h under the condition of a temperature of 60°C, and then continue to dry and cure it for 30 min under the condition of heating to 90°C to obtain leather with excellent abrasion-resistant and scratch-resistant properties.

[0049] Example 2:

[0050] This example is a preparation method of leather with excellent abrasion-resistant and scratch-resistant properties, including the following steps:

[0051] Step S1: Add 10 mmol of perfluorohexylethyl alcohol, 10 mmol of methacrylic acid, 0.15 g of hydroquinone, 0.9 g of p-toluenesulfonic acid, and 85 mL of anhydrous toluene into a three-necked flask equipped with a stirrer, a thermometer, a gas pipe, and a reflux condenser. Introduce nitrogen for protection. Stir and react for 15 min under the conditions of a temperature of 22 °C and a stirring rate of 250 r / min. Then, raise the temperature to 82 °C and continue to stir and react for 4.5 h. After that, raise the temperature to 95 °C and continue to stir and react for 2.5 h. After the reaction is completed, cool the reaction product to room temperature. Then, wash it 4 times with a sodium hydroxide solution with a mass fraction of 5.5% and saturated brine in sequence. Then, dry it with anhydrous magnesium sulfate. Then, perform vacuum filtration. Rotate and evaporate the filtrate to remove the solvent to obtain a polyfluoromonomer;

[0052] Step S2: Add 6 g of polyfluoromonomer, 22 g of methyl methacrylate, 11 g of butyl acrylate, 8 g of glycidyl methacrylate, 4 g of 2-hydroxyethyl methacrylate, 1 g of emulsifier, and 105 mL of deionized water into a three-necked flask equipped with a stirrer, a thermometer, a gas pipe, and a constant-pressure dropping funnel. Introduce nitrogen for protection. Stir and react for 15 min under the conditions of a temperature of 28 °C and a stirring rate of 250 r / min. Then, raise the temperature to 88 °C and gradually add 21 mL of an ammonium persulfate solution with a mass fraction of 4% drop by drop while stirring, controlling the dropping rate at 1 drop / s. After the dropping is completed, continue to stir and react for 4 h. After the reaction is completed, cool the reaction product to room temperature to obtain a film-forming emulsion;

[0053] Step S3: Add 5 g of basalt fibers with an average length of 1 mm and an average diameter of 3 μm, 22 mL of petroleum ether, and 22 mL of anhydrous ethanol into a three-necked flask equipped with a stirrer and a thermometer. Perform ultrasonic treatment for 40 min under the condition of an ultrasonic power of 250 W. Then, stir and react for 4 h under the conditions of a temperature of 28 °C and a stirring rate of 250 r / min. After the reaction is completed, centrifuge the reaction product. Then, wash the precipitate 4 times with distilled water. Then, place it in a vacuum drying oven and dry it at a temperature of 82 °C for 1.5 h to obtain pretreated basalt fibers;

[0054] Step S4: Add 0.3679 g of ammonium molybdate tetrahydrate, 0.6786 g of thiourea, 7 mL of polyethylene glycol PEG-400, and 85 mL of deionized water into a three-necked flask equipped with a stirrer and a thermometer. Stir and react for 40 min under the conditions of a temperature of 28 °C and a stirring rate of 250 r / min. Then, add 5 g of pretreated basalt fibers and carry out a hydrothermal reaction at 200 °C for 18 h. After the reaction is completed, cool the reaction product to room temperature. Then, centrifuge it and wash the precipitate 4 times with anhydrous ethanol and distilled water in sequence. Then, place it in a vacuum drying oven and dry it at a temperature of 62 °C for 4 h to obtain molybdenum disulfide-coated basalt fibers;

[0055] Step S5: Add 75 mL of absolute ethanol into a three-necked flask equipped with a stirrer and a thermometer, adjust the pH to 9.5 with an ammonia aqueous solution with a mass fraction of 11%, then add 5 g of molybdenum disulfide-coated basalt fibers and stir and react for 15 min under the conditions of a temperature of 28 °C and a stirring rate of 250 r / min. Then add 6 g of isocyanatopropyltriethoxysilane and continue to stir and react for 5.5 h under the condition of heating up to 82 °C. After the reaction is completed, cool the reaction product to room temperature, then centrifuge and wash the precipitate 4 times with distilled water, and then place it in a vacuum drying oven and dry it for 4 h under the condition of a temperature of 52 °C to obtain a composite reinforcing filler;

[0056] Step S6: Weigh 75 parts by weight of a film-forming emulsion, 8 parts of a composite reinforcing filler, 3 parts of a film-forming aid, 2 parts of a thickener, 1 part of a crosslinking agent, 0.7 part of an antifoaming agent, and 0.3 part of a leveling agent, and set aside; the film-forming aid is propylene glycol butyl ether; the thickener is hydroxyethyl cellulose; the crosslinking agent is an aziridine crosslinking agent; the antifoaming agent is TEGO825 antifoaming agent; the leveling agent is BYK-306 leveling agent;

[0057] Step S7: Add the film-forming emulsion, the composite reinforcing filler, the film-forming aid, the thickener, the crosslinking agent, the antifoaming agent, and the leveling agent into a mixer and stir and mix for 35 min under the conditions of a temperature of 28 °C and a stirring rate of 900 r / min to obtain a wear-resistant and scratch-resistant slurry;

[0058] Step S8: Spray the wear-resistant and scratch-resistant slurry on the surface of blue wet cowhide leather with a thickness of 1.3 mm, control the coating thickness at 50 μm, then put the sprayed leather into a vacuum drying oven and dry and cure it for 1.5 h under the condition of a temperature of 65 °C, and then continue to dry and cure it for 35 min under the condition of heating up to 95 °C to obtain leather with excellent wear-resistant and scratch-resistant properties.

[0059] Example 3:

[0060] This example is a preparation method of leather with excellent wear-resistant and scratch-resistant properties, including the following steps:

[0061] Step S1: Add 10 mmol of perfluorohexylethyl alcohol, 10 mmol of methacrylic acid, 0.2 g of hydroquinone, 1 g of p-toluenesulfonic acid, and 90 mL of anhydrous toluene into a three-necked flask equipped with a stirrer, a thermometer, a gas pipe, and a reflux condenser. Introduce nitrogen for protection. Stir and react for 20 min under the conditions of a temperature of 25 °C and a stirring rate of 300 r / min. Then, continue to stir and react for 5 h under the condition of heating to 85 °C. Subsequently, continue to stir and react for 3 h under the condition of heating to 100 °C. After the reaction is completed, cool the reaction product to room temperature. Then, wash it 5 times successively with a 6% sodium hydroxide solution by mass and saturated brine. Then, dry it with anhydrous magnesium sulfate. Then, perform vacuum filtration. Rotate and evaporate the filtrate to remove the solvent to obtain a polyfluoromonomer;

[0062] Step S2: Add 9 g of polyfluoromonomer, 25 g of methyl methacrylate, 12 g of butyl acrylate, 10.5 g of glycidyl methacrylate, 5 g of 2-hydroxyethyl methacrylate, 1.2 g of emulsifier, and 110 mL of deionized water into a three-necked flask equipped with a stirrer, a thermometer, a gas pipe, and a constant-pressure dropping funnel. Introduce nitrogen for protection. Stir and react for 20 min under the conditions of a temperature of 30 °C and a stirring rate of 300 r / min. Then, while stirring, gradually add 22 mL of a 5% ammonium persulfate solution by mass dropwise under the condition of heating to 90 °C, controlling the dropping rate at 2 drops / s. After the dropping is completed, continue to stir and react for 5 h. After the reaction is completed, cool the reaction product to room temperature to obtain a film-forming emulsion;

[0063] Step S3: Add 5 g of basalt fibers with an average length of 1 mm and an average diameter of 3 μm, 25 mL of petroleum ether, and 25 mL of anhydrous ethanol into a three-necked flask equipped with a stirrer and a thermometer. Perform ultrasonic treatment for 50 min under the condition of an ultrasonic power of 300 W. Then, stir and react for 5 h under the conditions of a temperature of 30 °C and a stirring rate of 300 r / min. After the reaction is completed, centrifuge the reaction product. Then, wash the precipitate 5 times with distilled water. Then, place it in a vacuum drying oven and dry it for 2 h under the condition of a temperature of 85 °C to obtain pretreated basalt fibers;

[0064] Step S4: Add 0.3679 g of ammonium molybdate tetrahydrate, 0.6786 g of thiourea, 8 mL of polyethylene glycol PEG-400, and 90 mL of deionized water into a three-necked flask equipped with a stirrer and a thermometer. Stir and react for 50 min under the conditions of a temperature of 30 °C and a stirring rate of 300 r / min. Then, add 5 g of pretreated basalt fibers and carry out a hydrothermal reaction at 210 °C for 20 h. After the reaction is completed, cool the reaction product to room temperature. Then, centrifuge and wash the precipitate 5 times successively with anhydrous ethanol and distilled water. Then, place it in a vacuum drying oven and dry it for 5 h under the condition of a temperature of 65 °C to obtain molybdenum disulfide-coated basalt fibers;

[0065] Step S5: Add 80 mL of absolute ethanol into a three-necked flask equipped with a stirrer and a thermometer, adjust the pH to 10 with an ammonia aqueous solution with a mass fraction of 12%, then add 5 g of molybdenum disulfide-coated basalt fibers and stir and react for 20 min under the conditions of a temperature of 30 °C and a stirring rate of 300 r / min. Then add 10 g of isocyanatopropyltriethoxysilane and continue to stir and react for 6 h under the condition of heating to 85 °C. After the reaction is completed, cool the reaction product to room temperature, then centrifuge and wash the precipitate 5 times with distilled water, and then place it in a vacuum drying oven and dry it for 5 h under the condition of a temperature of 55 °C to obtain a composite reinforcing filler;

[0066] Step S6: Weigh 85 parts of film-forming emulsion, 12 parts of composite reinforcing filler, 4 parts of film-forming aid, 3 parts of thickener, 1.2 parts of crosslinking agent, 0.9 part of defoaming agent and 0.4 part of leveling agent by weight for standby; the film-forming aid is propylene glycol butyl ether; the thickener is hydroxyethyl cellulose; the crosslinking agent is aziridine crosslinking agent; the defoaming agent is TEGO825 defoaming agent; the leveling agent is BYK-306 leveling agent;

[0067] Step S7: Add the film-forming emulsion, composite reinforcing filler, film-forming aid, thickener, crosslinking agent, defoaming agent and leveling agent into a mixer and stir and mix for 40 min under the conditions of a temperature of 30 °C and a stirring rate of 1000 r / min to obtain a wear-resistant and scratch-resistant slurry;

[0068] Step S8: Spray the wear-resistant and scratch-resistant slurry on the surface of blue wet cowhide leather with a thickness of 1.3 mm, control the coating thickness at 50 μm, then put the sprayed leather into a vacuum drying oven and dry and cure it for 2 h under the condition of a temperature of 70 °C, and then continue to dry and cure it for 40 min under the condition of heating to 100 °C to obtain leather with excellent wear-resistant and scratch-resistant properties.

[0069] Comparative Example 1:

[0070] This comparative example is a preparation method of leather with excellent wear-resistant and scratch-resistant properties, including the following steps:

[0071] Step S1: Add 25 g of methyl methacrylate, 12 g of butyl acrylate, 10.5 g of glycidyl methacrylate, 5 g of 2-hydroxyethyl methacrylate, 1.2 g of emulsifier, and 110 mL of deionized water into a three-necked flask equipped with a stirrer, a thermometer, a gas pipe, and a constant-pressure dropping funnel. Introduce nitrogen for protection and stir and react for 20 min under the conditions of a temperature of 30 °C and a stirring rate of 300 r / min. Then, while stirring, gradually add 22 mL of an ammonium persulfate solution with a mass fraction of 5% drop by drop under the condition of heating up to 90 °C, control the dropping rate at 2 drops / s. After the dropping is completed, continue to stir and react for 5 h. After the reaction is completed, cool the reaction product to room temperature to obtain a film-forming emulsion;

[0072] Step S2: Weigh 85 parts of the film-forming emulsion, 4 parts of a film-forming aid, 3 parts of a thickener, 1.2 parts of a crosslinking agent, 0.9 parts of an antifoaming agent, and 0.4 parts of a leveling agent by weight and set aside; the film-forming aid is propylene glycol butyl ether; the thickener is hydroxyethyl cellulose; the crosslinking agent is aziridine crosslinking agent; the antifoaming agent is TEGO825 antifoaming agent; the leveling agent is BYK-306 leveling agent;

[0073] Step S3: Add the film-forming emulsion, the film-forming aid, the thickener, the crosslinking agent, the antifoaming agent, and the leveling agent into a mixer and stir and mix for 40 min under the conditions of a temperature of 30 °C and a stirring rate of 1000 r / min to obtain a wear-resistant and scratch-resistant slurry;

[0074] Step S4: Spray the wear-resistant and scratch-resistant slurry on the surface of blue wet cowhide leather with a thickness of 1.3 mm, control the coating thickness at 50 μm, and then put the sprayed leather into a vacuum drying oven and dry and cure it for 2 h under the condition of a temperature of 70 °C, and then continue to dry and cure it for 40 min under the condition of heating up to 100 °C to obtain leather with excellent wear-resistant and scratch-resistant properties.

[0075] Comparative Example 2:

[0076] This comparative example is a preparation method of leather with excellent wear-resistant and scratch-resistant properties, including the following steps:

[0077] Step S1: Add 10 mmol of perfluorohexylethyl alcohol, 10 mmol of methacrylic acid, 0.2 g of hydroquinone, 1 g of p-toluenesulfonic acid, and 90 mL of anhydrous toluene into a three-necked flask equipped with a stirrer, a thermometer, a gas pipe, and a reflux condenser. Introduce nitrogen for protection. Stir and react for 20 min under the conditions of a temperature of 25°C and a stirring rate of 300 r / min. Then, raise the temperature to 85°C and continue to stir and react for 5 h. Subsequently, raise the temperature to 100°C and continue to stir and react for 3 h. After the reaction is completed, cool the reaction product to room temperature. Then, wash it 5 times successively with a 6% sodium hydroxide solution by mass and saturated brine. Then, dry it with anhydrous magnesium sulfate, and then perform vacuum filtration. Rotate and evaporate the filtrate to remove the solvent to obtain a polyfluoromonomer;

[0078] Step S2: Add 9 g of polyfluoromonomer, 25 g of methyl methacrylate, 12 g of butyl acrylate, 10.5 g of glycidyl methacrylate, 5 g of 2-hydroxyethyl methacrylate, 1.2 g of emulsifier, and 110 mL of deionized water into a three-necked flask equipped with a stirrer, a thermometer, a gas pipe, and a constant pressure dropping funnel. Introduce nitrogen for protection. Stir and react for 20 min under the conditions of a temperature of 30°C and a stirring rate of 300 r / min. Then, raise the temperature to 90°C and gradually add 22 mL of a 5% ammonium persulfate solution dropwise while stirring, controlling the dropping rate at 2 drops / s. After the dropping is completed, continue to stir and react for 5 h. After the reaction is completed, cool the reaction product to room temperature to obtain a film-forming emulsion;

[0079] Step S3: Weigh 85 parts of the film-forming emulsion, 4 parts of a film-forming aid, 3 parts of a thickener, 1.2 parts of a crosslinking agent, 0.9 parts of an antifoaming agent, and 0.4 parts of a leveling agent by weight for standby; the film-forming aid is propylene glycol butyl ether; the thickener is hydroxyethyl cellulose; the crosslinking agent is aziridine crosslinking agent; the antifoaming agent is TEGO825 antifoaming agent; the leveling agent is BYK-306 leveling agent;

[0080] Step S4: Add the film-forming emulsion, the film-forming aid, the thickener, the crosslinking agent, the antifoaming agent, and the leveling agent into a mixer and stir and mix for 40 min under the conditions of a temperature of 30°C and a stirring rate of 1000 r / min to obtain a wear-resistant and scratch-resistant slurry;

[0081] Step S5: Spray the wear-resistant and scratch-resistant slurry on the surface of blue wet cowhide leather with a thickness of 1.3 mm, control the coating thickness at 50 μm. Then, put the sprayed leather into a vacuum drying oven and dry and cure it at 70°C for 2 h. Then, raise the temperature to 100°C and continue to dry and cure it for 40 min to obtain leather with excellent wear-resistant and scratch-resistant properties.

[0082] Comparative Example 3:

[0083] This comparative example is a preparation method of a leather with excellent wear resistance and scratch resistance, including the following steps:

[0084] Step S1: Add 10 mmol of perfluorohexylethyl alcohol, 10 mmol of methacrylic acid, 0.2 g of hydroquinone, 1 g of p-toluenesulfonic acid, and 90 mL of anhydrous toluene into a three-necked flask equipped with a stirrer, a thermometer, a gas pipe, and a reflux condenser. Introduce nitrogen for protection. Stir and react for 20 min under the conditions of a temperature of 25 °C and a stirring rate of 300 r / min. Then, continue to stir and react for 5 h under the condition of heating to 85 °C. Then, continue to stir and react for 3 h under the condition of heating to 100 °C. After the reaction is completed, cool the reaction product to room temperature. Then, wash it 5 times with a 6% sodium hydroxide solution by mass and saturated brine in sequence. Then, dry it with anhydrous magnesium sulfate. Then, perform vacuum filtration. Rotate and evaporate the filtrate to remove the solvent to obtain a polyfluorinated monomer.

[0085] Step S2: Add 9 g of polyfluorinated monomer, 25 g of methyl methacrylate, 12 g of butyl acrylate, 10.5 g of glycidyl methacrylate, 5 g of 2-hydroxyethyl methacrylate, 1.2 g of emulsifier, and 110 mL of deionized water into a three-necked flask equipped with a stirrer, a thermometer, a gas pipe, and a constant-pressure dropping funnel. Introduce nitrogen for protection. Stir and react for 20 min under the conditions of a temperature of 30 °C and a stirring rate of 300 r / min. Then, while stirring, gradually add 22 mL of a 5% ammonium persulfate solution by mass dropwise under the condition of heating to 90 °C. Control the dropping rate at 2 drops / s. After the dropping is completed, continue to stir and react for 5 h. After the reaction is completed, cool the reaction product to room temperature to obtain a film-forming emulsion.

[0086] Step S3: Weigh 85 parts of the film-forming emulsion, 12 parts of basalt fiber, 4 parts of film-forming aid, 3 parts of thickener, 1.2 parts of crosslinking agent, 0.9 part of defoaming agent, and 0.4 part of leveling agent by weight for standby; the film-forming aid is propylene glycol butyl ether; the thickener is hydroxyethyl cellulose; the crosslinking agent is aziridine crosslinking agent; the defoaming agent is TEGO825 defoaming agent; the leveling agent is BYK-306 leveling agent.

[0087] Step S4: Add the film-forming emulsion, basalt fiber, film-forming aid, thickener, crosslinking agent, defoaming agent, and leveling agent into a mixer. Stir and mix for 40 min under the conditions of a temperature of 30 °C and a stirring rate of 1000 r / min to obtain a wear-resistant and scratch-resistant slurry.

[0088] Step S5: Spray the wear-resistant and scratch-resistant slurry on the surface of blue wet cowhide leather with a thickness of 1.3 mm, control the coating thickness at 50 μm, then put the sprayed leather into a vacuum drying oven, dry and cure it at a temperature of 70 °C for 2 h, and then continue to dry and cure it at a temperature of 100 °C for 40 min to obtain leather with excellent wear-resistant and scratch-resistant properties.

[0089] Comparative Example 4:

[0090] This comparative example is a preparation method of leather with excellent wear-resistant and scratch-resistant properties, including the following steps:

[0091] Step S1: Add 10 mmol of perfluorohexylethyl alcohol, 10 mmol of methacrylic acid, 0.2 g of hydroquinone, 1 g of p-toluenesulfonic acid, and 90 mL of anhydrous toluene into a three-necked flask equipped with a stirrer, thermometer, gas pipe, and reflux condenser, introduce nitrogen protection, stir and react at a temperature of 25 °C and a stirring rate of 300 r / min for 20 min, then continue to stir and react at a temperature of 85 °C for 5 h, and then continue to stir and react at a temperature of 100 °C for 3 h. After the reaction is completed, cool the reaction product to room temperature, then wash it 5 times with a 6% sodium hydroxide solution by mass fraction and saturated brine in sequence, then dry it with anhydrous magnesium sulfate, then vacuum filter, and rotary evaporate the filtrate to remove the solvent to obtain a polyfluorinated monomer;

[0092] Step S2: Add 9 g of polyfluorinated monomer, 25 g of methyl methacrylate, 12 g of butyl acrylate, 10.5 g of glycidyl methacrylate, 5 g of 2-hydroxyethyl methacrylate, 1.2 g of emulsifier, and 110 mL of deionized water into a three-necked flask equipped with a stirrer, thermometer, gas pipe, and constant pressure dropping funnel, introduce nitrogen protection, stir and react at a temperature of 30 °C and a stirring rate of 300 r / min for 20 min, then gradually add 22 mL of a 5% ammonium persulfate solution dropwise with stirring at a temperature of 90 °C, control the dropping rate at 2 drops / s, and continue to stir and react for 5 h after the dropping is completed. After the reaction is completed, cool the reaction product to room temperature to obtain a film-forming emulsion;

[0093] Step S3: Add 5 g of basalt fibers with an average length of 1 mm and an average diameter of 3 μm, 25 mL of petroleum ether, and 25 mL of anhydrous ethanol into a three-necked flask equipped with a stirrer and thermometer, ultrasonically treat it at an ultrasonic power of 300 W for 50 min, then stir and react at a temperature of 30 °C and a stirring rate of 300 r / min for 5 h. After the reaction is completed, centrifuge the reaction product, then wash the precipitate 5 times with distilled water, and then place it in a vacuum drying oven and dry it at a temperature of 85 °C for 2 h to obtain pretreated basalt fibers;

[0094] Step S4: Add 0.3679 g of ammonium molybdate tetrahydrate, 0.6786 g of thiourea, 8 mL of polyethylene glycol PEG-400, and 90 mL of deionized water into a three-necked flask equipped with a stirrer and a thermometer. Stir and react for 50 min under the conditions of a temperature of 30 °C and a stirring rate of 300 r / min. Then add 5 g of pretreated basalt fibers and carry out a hydrothermal reaction at 210 °C for 20 h. After the reaction is completed, cool the reaction product to room temperature, then centrifuge and wash the precipitate with anhydrous ethanol and distilled water 5 times successively. Then place it in a vacuum drying oven and dry it at 65 °C for 5 h to obtain molybdenum disulfide-coated basalt fibers;

[0095] Step S5: Weigh 85 parts of film-forming emulsion, 12 parts of molybdenum disulfide-coated basalt fibers, 4 parts of film-forming aid, 3 parts of thickener, 1.2 parts of crosslinking agent, 0.9 part of defoaming agent, and 0.4 part of leveling agent according to weight, and set aside; the film-forming aid is propylene glycol butyl ether; the thickener is hydroxyethyl cellulose; the crosslinking agent is aziridine crosslinking agent; the defoaming agent is TEGO825 defoaming agent; the leveling agent is BYK-306 leveling agent;

[0096] Step S6: Add the film-forming emulsion, molybdenum disulfide-coated basalt fibers, film-forming aid, thickener, crosslinking agent, defoaming agent, and leveling agent into a mixer, and stir and mix at a temperature of 30 °C and a stirring rate of 1000 r / min for 40 min to obtain a wear-resistant and scratch-resistant slurry;

[0097] Step S7: Spray the wear-resistant and scratch-resistant slurry on the surface of blue wet cowhide leather with a thickness of 1.3 mm, control the coating thickness at 50 μm, then put the sprayed leather into a vacuum drying oven and dry and cure it at 70 °C for 2 h, and then continue to dry and cure it at 100 °C for 40 min to obtain leather with excellent wear-resistant and scratch-resistant performance.

[0098] Perform performance tests on the leather with excellent wear-resistant and scratch-resistant performance in Examples 1-3 and Comparative Examples 1-4;

[0099] Accumulatively abrade 5000 r under the conditions of a rotational speed of 60 r / min and a load of 1 kg according to QB / T 2726-2005, and test the mass loss before and after surface abrasion; test the friction coefficient according to GB / T 3960-1983; determine the pencil hardness of the leather coating according to GB / T 6739-2006;

[0100] The test results are shown in the following table:

[0101]

[0102] Referring to the data in the above table, based on the comparison between Examples 1-3 and Comparative Examples 1-4, it can be known that using the film-forming emulsion and adding the composite reinforcing filler can effectively improve the wear and scratch resistance of the leather, making the leather of the present application have excellent wear and scratch resistance.

[0103] In the description of this specification, the description referring to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0104] The above content is only an example and illustration of the present invention. Those skilled in the art of the present technology can make various modifications or supplements to the described specific embodiments or use similar ways to replace them. As long as they do not deviate from the invention or exceed the scope defined by the present application, they should all belong to the protection scope of the present invention.

Claims

1. A leather with excellent wear and scratch resistance, characterized in that, Comprising the following components in parts by weight: 65 - 85 parts of film-forming emulsion, 4 - 12 parts of composite reinforcing filler, 2 - 4 parts of film-forming aid, 1 - 3 parts of thickener, 0.8 - 1.2 parts of cross-linking agent, 0.5 - 0.9 parts of defoamer, and 0.2 - 0.4 parts of leveling agent; Among them, the film-forming emulsion is prepared by the following steps: Step a1: Stir and react perfluorohexylethyl alcohol, methacrylic acid, hydroquinone, p-toluenesulfonic acid, and anhydrous toluene. After the reaction ends, cool the reaction product, then wash and dry it, then perform vacuum filtration, and rotary evaporate the filtrate to obtain a polyfluoro monomer; Step a2: Stir and react the polyfluoro monomer, methyl methacrylate, butyl acrylate, glycidyl methacrylate, 2-hydroxyethyl methacrylate, emulsifier, and deionized water, then add ammonium persulfate solution and continue stirring and reacting. After the reaction ends, cool the reaction product to obtain a film-forming emulsion.

2. The leather with excellent wear and scratch resistance according to claim 1, characterized in that, The dosage ratio of perfluorohexylethyl alcohol, methacrylic acid, hydroquinone, p-toluenesulfonic acid, and anhydrous toluene in step a1 is 10 mmol: 10 mmol: 0.1 - 0.2 g: 0.8 - 1 g: 80 - 90 mL.

3. A leather with excellent wear and scratch resistance according to claim 1, characterized in that, The dosage ratio of the polyfluoro monomer, methyl methacrylate, butyl acrylate, glycidyl methacrylate, 2-hydroxyethyl methacrylate, emulsifier, deionized water, and ammonium persulfate solution in step a2 is 3 - 9 g: 20 - 25 g: 10 - 12 g: 5.5 - 10.5 g: 3 - 5 g: 0.8 - 1.2 g: 100 - 110 mL: 20 - 22 mL; the emulsifier is a mixture of sodium dodecyl sulfate and emulsifier op-10 in a mass ratio of 1:1; the mass fraction of the ammonium persulfate solution is 3 - 5%.

4. A leather with excellent wear and scratch resistance according to claim 1, characterized in that, The composite reinforcing filler is prepared by the following steps: Step b1: Perform ultrasonic treatment on basalt fiber, petroleum ether, and anhydrous ethanol, then stir and react. After the reaction ends, centrifuge the reaction product, then wash and dry the precipitate to obtain pretreated basalt fiber; Step b2: Stir and react ammonium molybdate tetrahydrate, thiourea, polyethylene glycol, and deionized water, then add pretreated basalt fiber for hydrothermal reaction. After the reaction ends, cool the reaction product, then centrifuge and wash and dry the precipitate to obtain molybdenum disulfide-coated basalt fiber; Step b3: Adjust the pH of anhydrous ethanol with ammonia water solution, then add molybdenum disulfide-coated basalt fiber and isocyanatopropyltriethoxysilane for stirring and reacting. After the reaction ends, cool the reaction product, then centrifuge and wash and dry the precipitate to obtain a composite reinforcing filler.

5. A leather with excellent wear and scratch resistance according to claim 4, characterized in that, The dosage ratio of basalt fiber, petroleum ether, and anhydrous ethanol in step b1 is 5 g: 20 - 25 mL: 20 - 25 mL; the average length of the basalt fiber is 1 mm and the average diameter is 3 μm.

6. The leather with excellent wear and scratch resistance according to claim 4, characterized in that, The dosage ratio of ammonium molybdate tetrahydrate, thiourea, polyethylene glycol, deionized water, and pretreated basalt fiber in step b2 is 0.3679 g: 0.6786 g: 6 - 8 mL: 80 - 90 mL: 5 g; the polyethylene glycol is PEG-400.

7. A leather with excellent wear and scratch resistance according to claim 4, characterized in that, The dosage ratio of the absolute ethanol, molybdenum disulfide-coated basalt fiber, and isocyanatopropyltriethoxysilane in step b3 is 70 - 80 mL : 5 g : 2 - 10 g; the mass fraction of the ammonia water solution is 10 - 12%.

8. A method for preparing leather with excellent wear and scratch resistance, characterized in that, It includes the following steps: Step 1: Weigh 65 - 85 parts by weight of film-forming emulsion, 4 - 12 parts of composite reinforcing filler, 2 - 4 parts of film-forming aid, 1 - 3 parts of thickener, 0.8 - 1.2 parts of cross-linking agent, 0.5 - 0.9 parts of defoamer, and 0.2 - 0.4 parts of leveling agent, and set aside; Step 2: Add the film-forming emulsion, composite reinforcing filler, film-forming aid, thickener, cross-linking agent, defoamer, and leveling agent into a mixer, and stir and mix for 30 - 40 min under the conditions of a temperature of 25 - 30 °C and a stirring rate of 800 - 1000 r / min to obtain a wear-resistant and scratch-resistant slurry; Step 3: Spray the wear-resistant and scratch-resistant slurry on the leather surface, then put the sprayed leather into a vacuum drying oven, dry and cure it for 1 - 2 h under the condition of a temperature of 60 - 70 °C, and then raise the temperature to 90 - 100 °C and continue to dry and cure for 30 - 40 min to obtain leather with excellent wear-resistant and scratch-resistant performance.

9. The preparation method of a leather with excellent wear and scratch resistance according to claim 8, characterized in that, The film-forming aid is propylene glycol butyl ether; The thickener is hydroxyethyl cellulose; The cross-linking agent is aziridine cross-linking agent; The defoamer is TEGO825 defoamer; The leveling agent is BYK-306 leveling agent.

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