Water-based scratch-resistant and wear-resistant synthetic leather finishing agent and preparation method

Abstract

The present application relates to the technical field of leather finishing agent, and discloses a water-based scratch-resistant and wear-resistant synthetic leather finishing agent and a preparation method, the water-based scratch-resistant and wear-resistant synthetic leather finishing agent comprises 100 parts of water-based acrylic resin emulsion, 2-5 parts of cationic ester-based silicone oil, and 0.5-0.8 parts of defoaming agent; the cationic ester-based silicone oil contains hydrophilic quaternary ammonium salt and hydroxyl groups, improves the water dispersibility of the silicone oil, contains a large amount of ester groups, and has good compatibility with the acrylic resin, so that the silicone oil is uniformly dispersed in the water-based acrylic resin emulsion, and the storage stability of the finishing agent is not affected. Meanwhile, the impact resistance of the finishing agent coating is improved, the water absorption is reduced, the water resistance is improved, and the silicone oil introduces benzene rings, further improving the wear resistance and scratch resistance of the coating.

Description

Technical Field

[0001] This invention relates to the field of leather finishing agents, specifically to a water-based scratch-resistant and abrasion-resistant synthetic leather finishing agent and its preparation method. Background Technology

[0002] Synthetic leather is primarily made of polyvinyl chloride (PVC) and polyurethane, and is widely used in furniture, upholstery, bags, and clothing. Traditional synthetic leather suffers from drawbacks such as unattractive appearance, poor wear resistance, and a poor feel. Applying finishing agents to synthetic leather can impart advantages such as improved appearance, wear resistance, a soft feel, water resistance, and resistance to yellowing. Common finishing agents include polyurethane-based coatings and acrylic coatings.

[0003] Waterborne acrylic resin coatings have advantages such as low VOC content, high adhesion, and resistance to aging and yellowing, making them widely used. However, the high hydrophilicity and water absorption of waterborne acrylic resin coatings can affect the water resistance of the coating. Furthermore, acrylic resins have poor abrasion and scratch resistance. Modifying acrylic resins with organosilicon can improve the flexibility, water resistance, and abrasion resistance of the coating. Patent CN118291002B discloses a waterborne low-gloss, stain-resistant leather surface coating, its preparation method, and its application. Using waterborne fluorosilicone-modified acrylic resin, organic matting resin, and crosslinking resin as the topcoat can reduce gloss and improve stain resistance. However, the acrylic resin in this patent contains hydrophobic, low-surface-energy fluorine, which can affect the storage stability of the waterborne coating. Summary of the Invention

[0004] The technical problem solved by this invention is to address the issue of poor abrasion resistance and scratch resistance in acrylic synthetic leather coatings.

[0005] The technical solution adopted in this invention is: a water-based scratch-resistant and wear-resistant synthetic leather coating agent, comprising the following components in parts by weight: 100 parts water-based acrylic resin emulsion, 2-5 parts cationic ester-based silicone oil, and 0.5-0.8 parts defoamer.

[0006] The preparation method of cationic ester-based silicone oil is as follows: Toluene, hydrogen-containing silicone oil, and acrylate monomer are added to a flask, and an isopropanol solution containing chloroplatinic acid is added dropwise. The mixture is heated to 90-100℃ and stirred for 10-16 hours. During the reaction, the mixture is refluxed and the solvent is removed by rotary evaporation. Water and 2,3-epoxypropyltrimethylammonium chloride are added, and the mixture is stirred rapidly for 15-20 minutes at a stirring speed of 500-800 r / min. An alkaline solution is added dropwise, and the mixture is heated to 45-55℃ and stirred rapidly for 3-5 hours. The pH of the solution is maintained at 10-11 during the reaction. A saturated sodium chloride aqueous solution and ethyl acetate are added, and the mixture is shaken and allowed to stand for separation. The ethyl acetate organic phase is collected, and dried by rotary evaporation to obtain cationic ester-based silicone oil.

[0007] Furthermore, the molar ratio of the Si-H bond of the hydrogen-containing silicone oil, acrylate monomer, chloroplatinic acid, and 2,3-epoxypropyltrimethylammonium chloride is 100:(90-100):(0.006-0.008):(130-145).

[0008] Furthermore, the alkaline solution is an aqueous solution of sodium hydroxide or potassium hydroxide.

[0009] Further, the preparation method of acrylate monomer is as follows: toluene, dimethyl 5-hydroxyisophthalate in a molar ratio of 100:(120-140):(5-6):(1-1.6), glycidyl methacrylate, tetrabutylammonium bromide, and polymerization inhibitor 2,6-di-tert-butyl-p-cresol are added to a flask, heated to 100-110℃, stirred for 6-8 hours, refluxed during the reaction, solvent removed by rotary evaporation, and the product separated by silica gel column chromatography to obtain acrylate monomer.

[0010] Furthermore, the preparation method of the water-based scratch-resistant and abrasion-resistant synthetic leather coating agent is as follows: cationic ester-based silicone oil and defoamer are added to the water-based acrylic resin emulsion, and the mixture is stirred for 20-30 minutes to obtain the water-based scratch-resistant and abrasion-resistant synthetic leather coating agent.

[0011] The beneficial technical effects of this invention are as follows: An acrylate monomer containing a benzene ring, hydroxyl group, and multiple ester groups undergoes an addition reaction with a hydrogen-containing silicone oil. Then, the hydroxyl group undergoes a ring-opening reaction with the epoxy group of 2,3-epoxypropyltrimethylammonium chloride to obtain a cationic ester-based silicone oil. This cationic ester-based silicone oil is added to an aqueous acrylic resin emulsion to obtain an aqueous scratch-resistant and abrasion-resistant synthetic leather coating agent. The cationic ester-based silicone oil contains hydrophilic quaternary ammonium salts and hydroxyl groups, which improves the water dispersibility of the silicone oil. Furthermore, the presence of a large number of ester groups enhances its compatibility with acrylic resins, ensuring uniform dispersion of the silicone oil in the aqueous acrylic resin emulsion without affecting the storage stability of the coating agent.

[0012] The cationic ester-based silicone oil of the present invention contains a large number of ester groups, which have good compatibility with acrylic resin and are uniformly distributed in the coating film. This can improve the impact resistance of the coating film, reduce water absorption, and improve water resistance. Furthermore, the silicone oil introduces rigid benzene rings, which further improves the wear and scratch resistance of the coating film. Detailed Implementation

[0013] The following water-based acrylic resin emulsion, model E0503-X, has a solid content of 37% and is manufactured by Shenzhen Yoshida Chemical Co., Ltd. The defoamer is brand TEGO ANTIFOAM 3062. The hydrogen-containing silicone oil has a hydrogen content of 0.36% and is manufactured by Hubei Kemaidi Chemical Co., Ltd.

[0014] Example 1: (1) 200 mL toluene, 50 mmol dimethyl 5-hydroxyisophthalate, 60 mmol glycidyl methacrylate, 3 mmol tetrabutylammonium bromide, and 0.5 mmol 2,6-di-tert-butyl-p-cresol were added to a flask. The mixture was heated to 100 °C and stirred for 8 h. The mixture was refluxed during the reaction, and the solvent was removed by rotary evaporation. The product was separated by silica gel column chromatography and eluted with petroleum ether-ethyl acetate solution to obtain acrylate monomers. The reaction formula is as follows: .

[0015] (2) Add 20 mL of toluene, 10 g of hydrogen-containing silicone oil, and acrylate monomer to a flask. Add isopropanol solution containing chloroplatinic acid (concentration 0.04 mmol / mL) dropwise, heat to 100 °C, and stir for 12 h. During the reaction, reflux the solution and remove the solvent by rotary evaporation. Add 120 mL of water and 2,3-epoxypropyltrimethylammonium chloride, and stir rapidly for 15 min at a stirring speed of 800 r / min. Control the molar ratio of the Si-H bond of the hydrogen-containing silicone oil, acrylate monomer, chloroplatinic acid, and 2,3-epoxypropyltrimethylammonium chloride to be 100:100:0.007:145. Add 15% sodium hydroxide aqueous solution dropwise, heat to 55 °C, and stir rapidly for 3 h. Maintain the pH of the solution at 10 during the reaction. Add saturated sodium chloride aqueous solution and ethyl acetate, shake, and allow to stand for separation. Collect the organic phase of ethyl acetate, evaporate by rotary evaporation, and dry to obtain cationic ester-based silicone oil. The reaction formula is: .

[0016] (3) Add 20g of cationic ester-based silicone oil and 5g of defoamer to 1kg of water-based acrylic resin emulsion, stir and mix for 30min to obtain water-based scratch-resistant and wear-resistant synthetic leather coating agent.

[0017] Example 2: (1) Add 300 mL toluene, 80 mmol dimethyl 5-hydroxyisophthalate, 112 mmol glycidyl methacrylate, 4 mmol tetrabutylammonium bromide, and 1.28 mmol polymerization inhibitor 2,6-di-tert-butyl-p-cresol to a flask, heat to 110 °C, stir and react for 6 h, reflux during the reaction, remove the solvent by rotary evaporation, separate the product by silica gel column chromatography, and elute with petroleum ether-ethyl acetate solution to obtain acrylate monomer.

[0018] (2) Add 45 mL of toluene, 20 g of hydrogen-containing silicone oil and acrylate monomer to a flask, add isopropanol solution containing chloroplatinic acid (concentration 0.04 mmol / mL) dropwise, heat to 100 °C, stir for 10 h, reflux during the reaction, remove solvent by rotary evaporation, add 300 mL of water and 2,3-epoxypropyltrimethylammonium chloride, stir rapidly for 20 min at a stirring speed of 600 r / min, control the molar ratio of Si-H bond of hydrogen-containing silicone oil, acrylate monomer, chloroplatinic acid and 2,3-epoxypropyltrimethylammonium chloride to be 100:90:0.006:130; add 10% potassium hydroxide aqueous solution dropwise, heat to 50 °C, stir rapidly for 4 h, maintain the pH of the solution at 10 during the reaction, add saturated sodium chloride aqueous solution and ethyl acetate, shake and let stand to separate the layers, collect the ethyl acetate organic phase, dry by rotary evaporation to obtain cationic ester silicone oil.

[0019] (3) Add 30g of cationic ester-based silicone oil and 6.3g of defoamer to 1kg of water-based acrylic resin emulsion, stir and mix for 20min to obtain water-based scratch-resistant and wear-resistant synthetic leather coating agent.

[0020] Example 3: (1) Add 50 mL of toluene, 20 g of hydrogen-containing silicone oil, and acrylate monomer (prepared according to the method of Example 2) to a flask, add dropwise isopropanol solution containing chloroplatinic acid (concentration 0.04 mmol / mL), heat to 100 °C, stir for 12 h, reflux during the reaction, remove the solvent by rotary evaporation, add 300 mL of water and 2,3-epoxypropyltrimethylammonium chloride, stir rapidly for 20 min at a stirring speed of 500 r / min, and control the molar ratio of Si-H bond of hydrogen-containing silicone oil, acrylate monomer, chloroplatinic acid, and 2,3-epoxypropyltrimethylammonium chloride to be 100: 100: 0.008:140; add dropwise 10% potassium hydroxide aqueous solution, heat to 45 °C, stir rapidly for 5 h, maintain the pH of the solution at 10 during the reaction, add saturated sodium chloride aqueous solution and ethyl acetate, shake and let stand to separate the layers, collect the ethyl acetate organic phase, dry by rotary evaporation to obtain cationic ester-based silicone oil.

[0021] (3) Add 40g of cationic ester-based silicone oil and 8g of defoamer to 1kg of water-based acrylic resin emulsion, stir and mix for 30min to obtain water-based scratch-resistant and wear-resistant synthetic leather coating agent.

[0022] Example 4: (1) Add 70 mL of toluene, 30 g of hydrogen-containing silicone oil, and acrylate monomer (prepared according to the method of Example 2) to a flask, add dropwise isopropanol solution containing chloroplatinic acid (concentration 0.04 mmol / mL), heat to 90 °C, stir for 16 h, reflux during the reaction, remove the solvent by rotary evaporation, add 400 mL of water and 2,3-epoxypropyltrimethylammonium chloride, stir rapidly for 20 min at a stirring speed of 600 r / min, and control the molar ratio of Si-H bond of hydrogen-containing silicone oil, acrylate monomer, chloroplatinic acid, and 2,3-epoxypropyltrimethylammonium chloride to be 100: 90: 0.007: 140; add dropwise 15% sodium hydroxide aqueous solution, heat to 50 °C, stir rapidly for 5 h, maintain the pH of the solution at 11 during the reaction, add saturated sodium chloride aqueous solution and ethyl acetate, shake and let stand to separate the layers, collect the ethyl acetate organic phase, dry by rotary evaporation to obtain cationic ester-based silicone oil.

[0023] (2) Add 50g of cationic ester-based silicone oil and 8g of defoamer to 1kg of water-based acrylic resin emulsion, stir and mix for 30min to obtain water-based scratch-resistant and wear-resistant synthetic leather coating agent.

[0024] The main difference between Comparative Example 1 and Example 1 is that no acrylate monomer is added.

[0025] (1) Add 10g of hydrogen-containing silicone oil, 120mL of water and 2,3-epoxypropyltrimethylammonium chloride to a flask, stir rapidly for 15min at a stirring speed of 800r / min, and control the molar ratio of Si-H bond of hydrogen-containing silicone oil to 2,3-epoxypropyltrimethylammonium chloride to be 100:145; and add 15% sodium hydroxide aqueous solution by mass dropwise, heat to 55℃, stir rapidly for 3h, and maintain the pH of the solution at 10. Since the hydrogen-containing silicone oil does not contain hydroxyl groups, it cannot react with the epoxy groups of 2,3-epoxypropyltrimethylammonium chloride. Add water and ethyl acetate, shake and let stand to separate the layers, collect the organic phase of ethyl acetate, evaporate by rotary evaporation and dry to obtain hydrogen-containing silicone oil.

[0026] (2) Add 20g of hydrogen-containing silicone oil and 5g of defoamer to 1kg of water-based acrylic resin emulsion, stir and mix for 30min to obtain synthetic leather coating agent.

[0027] Comparative Example 2 differs from Example 1 in that it uses dimethyl 5-allyloxyisophthalate instead of acrylate monomer.

[0028] (1) Dimethyl 5-allyloxyisophthalate was prepared according to the method described in the literature Eur. J. Org. Chem. 2001, 2535, "Parallel Combinatorial Synthesis of Glycodendrimers and Their Hydrogelation Properties". The structural formula is as follows: .

[0029] (2) Add 20 mL of toluene, 10 g of hydrogen-containing silicone oil, and dimethyl 5-allyloxyisophthalate to a flask. Add dropwise an isopropanol solution containing chloroplatinic acid (concentration 0.04 mmol / mL), heat to 100 °C, and stir for 12 h. During the reaction, reflux the solution and remove the solvent by rotary evaporation. Add 120 mL of water and 2,3-epoxypropyltrimethylammonium chloride, and stir rapidly for 15 min at a stirring speed of 800 r / min. Control the molar ratio of the Si-H bonds of the hydrogen-containing silicone oil, dimethyl 5-allyloxyisophthalate, chloroplatinic acid, and 2,3-epoxypropyltrimethylammonium chloride to be 100:100: 0.007:145; and add dropwise a 15% sodium hydroxide aqueous solution, heat to 55℃, stir rapidly for 3 hours, and maintain the pH of the solution at 10. Dimethyl 5-allyloxyisophthalate does not contain hydroxyl groups, which means that the silicone oil cannot react with the epoxy groups of 2,3-epoxypropyltrimethylammonium chloride. Add water and ethyl acetate, shake, and let stand to separate the layers. Collect the ethyl acetate organic phase, evaporate by rotary evaporation, and dry to obtain ester-based silicone oil.

[0030] (3) Add 20g of ester-based silicone oil and 5g of defoamer to 1kg of water-based acrylic resin emulsion, stir and mix for 30min to obtain synthetic leather coating agent.

[0031] Comparative Example 3 differs from Example 1 in that hydroxyethyl acrylate is used instead of acrylate monomers.

[0032] (1) Add 20 mL of toluene, 10 g of hydrogen-containing silicone oil and hydroxyethyl acrylate to a flask, add isopropanol solution containing chloroplatinic acid (concentration 0.04 mmol / mL) dropwise, heat to 100 °C, stir for 12 h, reflux during the reaction, remove the solvent by rotary evaporation, add 120 mL of water and 2,3-epoxypropyltrimethylammonium chloride, stir rapidly for 15 min at a stirring speed of 800 r / min, control the molar ratio of Si-H bond of hydrogen-containing silicone oil, hydroxyethyl acrylate, chloroplatinic acid and 2,3-epoxypropyltrimethylammonium chloride to be 100:100:0.007:145; add 15% sodium hydroxide aqueous solution dropwise, heat to 55 °C, stir rapidly for 3 h, maintain the pH of the solution at 10 during the reaction, add saturated sodium chloride aqueous solution and ethyl acetate, shake and let stand to separate the layers, collect the ethyl acetate organic phase, dry by rotary evaporation to obtain cationic silicone oil.

[0033] (2) Add 20g of cationic silicone oil and 5g of defoamer to 1kg of water-based acrylic resin emulsion, stir and mix for 30min to obtain synthetic leather coating agent.

[0034] Comparative Example 4 differs from Example 1 in that phenol is used instead of dimethyl 5-hydroxyisophthalate.

[0035] (1) Add 200 mL toluene, 50 mmol phenol, 60 mmol glycidyl methacrylate, 3 mmol tetrabutylammonium bromide, and 0.5 mmol 2,6-di-tert-butyl-p-cresol as polymerization inhibitor to a flask. Heat to 100 °C and stir for 8 h. During the reaction, reflux the solution and remove the solvent by rotary evaporation. Separate the product by silica gel column chromatography and elute with petroleum ether-ethyl acetate solution to obtain the acrylate monomer, with the structural formula as follows: .

[0036] (2) Add 20 mL of toluene, 10 g of hydrogen-containing silicone oil and acrylate monomer to a flask, add isopropanol solution containing chloroplatinic acid (concentration 0.04 mmol / mL) dropwise, heat to 100 °C, stir for 12 h, reflux during the reaction, remove the solvent by rotary evaporation, add 120 mL of water and 2,3-epoxypropyltrimethylammonium chloride, stir rapidly for 15 min at a stirring speed of 800 r / min, control the molar ratio of Si-H bond of hydrogen-containing silicone oil, acrylate monomer, chloroplatinic acid and 2,3-epoxypropyltrimethylammonium chloride to be 100:100:0.007:145; add 15% sodium hydroxide aqueous solution dropwise, heat to 55 °C, stir rapidly for 3 h, maintain the pH of the solution at 10 during the reaction, add saturated sodium chloride aqueous solution and ethyl acetate, shake and let stand to separate the layers, collect the ethyl acetate organic phase, dry by rotary evaporation to obtain cationic silicone oil.

[0037] (3) Add 20g of cationic silicone oil and 5g of defoamer to 1kg of water-based acrylic resin emulsion, stir and mix for 30min to obtain synthetic leather coating agent.

[0038] The synthetic leather coating agent was left at room temperature for 30 days to observe its storage stability.

[0039] The synthetic leather coating agent was baked and cured to form a film at 70℃ for 1 hour, followed by 24 hours at room temperature. The abrasion resistance and mass loss of the coating were tested according to GB / T 1768-2006 standard at 100 revolutions. The impact resistance was tested according to GB / T 1732-2020 standard.

[0040] The coating film was dried in an oven at 100℃ to constant weight, then soaked in water for 24 hours. The coating film was then removed, the surface moisture was wiped off, and the film was weighed to calculate the water absorption rate. Water absorption rate = (mass after water absorption - mass before water absorption) ÷ mass before water absorption × 100%.

[0041] Table 1 Performance of Synthetic Leather Finishing Agents

[0042] The acrylic resin coatings of each embodiment are free of oily residue and stratification, exhibit good storage stability, low mass loss and water absorption, and high impact resistance. They possess excellent abrasion resistance, water resistance, and impact resistance, primarily due to the addition of cationic ester-based silicone oil. This silicone oil contains hydrophilic quaternary ammonium salts and hydroxyl groups, which improves the water dispersibility of the silicone oil. Furthermore, the presence of a large number of ester groups enhances its compatibility with acrylic resin, allowing the silicone oil to be uniformly dispersed in the water-based acrylic resin emulsion without affecting the storage stability of the coating. Simultaneously, the uniform distribution of silicone oil in the coating film improves impact resistance, reduces water absorption, and enhances water resistance. Moreover, the introduction of rigid benzene rings into the silicone oil further improves the abrasion and scratch resistance of the coating film, thereby reducing mass loss.

[0043] The hydrogen-containing silicone oil in Comparative Example 1 does not contain hydroxyl groups and cannot react with 2,3-epoxypropyltrimethylammonium chloride. It does not introduce hydrophilic quaternary ammonium salts and hydroxyl groups, nor does it contain ester groups. It has poor dispersibility in waterborne acrylic resin emulsions, is prone to oil-water separation after storage, and has a large loss of coating mass and water absorption rate. It also has poor wear resistance, scratch resistance, and water resistance, as well as low impact resistance.

[0044] The 5-allyloxyisophthalate dimethyl ester of Comparative Example 2 does not contain hydroxyl groups. After undergoing an addition reaction with hydrogen-containing silicone oil, it cannot undergo a ring-opening reaction with 2,3-epoxypropyltrimethylammonium chloride. The resulting ester-based silicone oil does not contain hydrophilic quaternary ammonium salts and hydroxyl groups. It has poor dispersibility in waterborne acrylic resin emulsions, is prone to oil-water separation after storage, and has a large loss of coating mass and water absorption rate. It also has poor wear resistance, scratch resistance, and water resistance, as well as low impact resistance.

[0045] The hydroxyethyl acrylate in Comparative Example 3 contains fewer ester groups. After reacting with hydrogen-containing silicone oil, the resulting cationic silicone oil has a lower ester group content and lower compatibility with acrylic resin. This leads to greater quality loss and water absorption of the coating film, poor abrasion resistance, scratch resistance, and water resistance, as well as lower impact resistance.

[0046] The acrylate monomer in Comparative Example 4 contains fewer ester groups. After reacting with hydrogen-containing silicone oil, the resulting cationic silicone oil has a lower ester group content and lower compatibility with acrylic resin. This leads to greater quality loss and water absorption of the coating film, poor abrasion resistance, scratch resistance, and water resistance, as well as lower impact resistance.

Claims

1. A water-based scratch-resistant and abrasion-resistant synthetic leather coating agent, characterized in that, The water-based scratch-resistant and abrasion-resistant synthetic leather coating agent comprises the following components in parts by weight: 100 parts water-based acrylic resin emulsion, 2-5 parts cationic ester-based silicone oil, and 0.5-0.8 parts defoamer; The cationic ester-based silicone oil is prepared by the following method: toluene, hydrogen-containing silicone oil, and acrylate monomer are added to a flask, and an isopropanol solution containing chloroplatinic acid is added dropwise to carry out an addition reaction. The solvent is removed by rotary evaporation, and water and 2,3-epoxypropyltrimethylammonium chloride are added. After rapid stirring, an alkaline solution is added dropwise to carry out a ring-opening reaction. A saturated sodium chloride aqueous solution and ethyl acetate are added, and after shaking and standing to separate the layers, the ethyl acetate organic phase is collected, and after rotary evaporation and drying, the cationic ester-based silicone oil is obtained. The structural formula of the acrylate monomer is as follows: .

2. The water-based scratch-resistant and abrasion-resistant synthetic leather coating agent according to claim 1, characterized in that, The molar ratio of the Si-H bond of the hydrogen-containing silicone oil, acrylate monomer, chloroplatinic acid, and 2,3-epoxypropyltrimethylammonium chloride is 100:(90-100):(0.006-0.008):(130-145).

3. The water-based scratch-resistant and abrasion-resistant synthetic leather coating agent according to claim 1, characterized in that, The addition reaction is carried out at a temperature of 90-100℃ for a time of 10-16 hours.

4. The water-based scratch-resistant and abrasion-resistant synthetic leather coating agent according to claim 1, characterized in that, The ring-opening reaction is carried out at a temperature of 45-55℃ for 3-5 hours.

5. The water-based scratch-resistant and abrasion-resistant synthetic leather coating agent according to claim 1, characterized in that, The addition of alkaline solution maintains the pH of the solution at 10-11 during the reaction.

6. The water-based scratch-resistant and abrasion-resistant synthetic leather coating agent according to claim 5, characterized in that, The alkaline solution is an aqueous solution of sodium hydroxide or potassium hydroxide.

7. The water-based scratch-resistant and abrasion-resistant synthetic leather coating agent according to claim 2, characterized in that, The acrylate monomer is prepared by the following method: toluene, dimethyl 5-hydroxyisophthalate in a molar ratio of 100:(120-140):(5-6):(1-1.6), glycidyl methacrylate, tetrabutylammonium bromide, and 2,6-di-tert-butyl-p-cresol are added to a flask, heated to 100-110°C, and stirred for 6-8 hours. The mixture is refluxed during the reaction, and the solvent is removed by rotary evaporation. The product is separated by silica gel column chromatography to obtain the acrylate monomer.

8. A method for preparing a water-based scratch-resistant and abrasion-resistant synthetic leather coating agent as described in any one of claims 1-7, characterized in that, The preparation method is as follows: cationic ester-based silicone oil and defoamer are added to water-based acrylic resin emulsion, and the mixture is stirred to obtain water-based scratch-resistant and wear-resistant synthetic leather coating agent.

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