Scratch-resistant protective coating and preparation method thereof
By introducing an organic-inorganic hybrid modifier with a core-shell structure of molybdenum disulfide nanosheets and hyperbranched polyurea into acrylic coatings, the problems of insufficient hardness and scratch resistance of the coatings were solved, and a coating effect of high adhesion and self-healing was achieved.
Patent Information
- Application Number
- CN202511041080.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-28
- Publication Date
- 2025-10-10
AI Technical Summary
Traditional acrylic coatings have low hardness and insufficient scratch resistance, and the use of inorganic nanoparticle fillers affects the coating uniformity and transparency.
An organic-inorganic hybrid modifier is used to form a scratch-resistant coating by introducing a core-shell structure with molybdenum disulfide nanosheets as the core and hyperbranched polyurea as the shell, combined with a silane coupling agent and a functional additive.
The coating has excellent adhesion, scratch resistance and high hardness, can effectively prevent scratches from expanding, and has self-repair capabilities.
Smart Images
Figure IMAGE_607E834E-75E7-4D54-9A0E-F8168F88DF3C
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of coatings, and in particular to a scratch-resistant protective coating and a preparation method thereof. Background Art
[0002] Acrylic paints, primarily based on acrylic resins, offer excellent weather resistance, gloss and color retention, chemical resistance, and good adhesion, making them widely used in the automotive, architectural, furniture, and electronic equipment sectors. However, traditional acrylic paints suffer from low hardness and insufficient scratch resistance, making them susceptible to scratches from mechanical friction or sharp objects, impacting both their aesthetics and service life.
[0003] In the existing technology, the crosslinking density of acrylic resin is generally increased by introducing multifunctional monomers (such as hydroxyethyl methacrylate, ethylene glycol dimethacrylate) or crosslinking agents (such as isocyanate, melamine resin), thereby enhancing the hardness and wear resistance of the coating. However, excessive crosslinking will lead to increased brittleness and decreased flexibility of the coating, and it is easy to crack when impacted or bent; or hard fillers such as nano-silicon dioxide (SiO2), nano-alumina (Al2O3) or nano-silicon carbide (SiC) are added to the acrylic resin to utilize their high hardness and wear resistance to improve the scratch resistance of the coating. However, inorganic nanoparticles are easy to agglomerate and have poor compatibility with organic resins, affecting the uniformity and transparency of the coating.
[0004] Existing scratch-resistant coating modification methods (such as cross-linking and inorganic filler filling) can no longer meet the needs of high-end applications. Therefore, improving the scratch resistance of acrylic coatings has become an important research direction in the coatings industry. Summary of the Invention
[0005] In order to solve the above technical problems, the present invention provides a scratch-resistant protective coating and a preparation method thereof.
[0006] The purpose of the present invention can be achieved through the following technical solutions: A scratch-resistant protective coating comprises the following raw materials in parts by weight: 25-35 parts of acrylic resin, 10-16 parts of polyurethane acrylic resin, 6-10 parts of organic-inorganic hybrid modifier, 1.5-3.5 parts of mica powder, 0.5-1.5 parts of silane coupling agent, 2.5-3.5 parts of photoinitiator, 0.5-1 part of leveling agent, 0.3-0.6 part of defoaming agent, 3.5-7.5 parts of isopropyl alcohol, and 15-25 parts of water; Furthermore, the silane coupling agent is one of KH-570 or vinyltrimethoxysilane; Further, the photoinitiator is one of photoinitiator TPO or photoinitiator 184; Furthermore, the leveling agent is Digao 110 leveling agent; Furthermore, the defoaming agent is TEGO Foamex 825; The organic-inorganic hybrid modifier is prepared by the following steps: Step A1: Under nitrogen, 1,1,3,3-tetramethyldisiloxane, methyltrimethoxysilane, 3-aminopropyltrimethoxysilane, and trifluoromethanesulfonic acid were added to a reactor and stirred at room temperature for 24 hours. Anhydrous sodium bicarbonate was added and stirred for 1.5 hours. Anhydrous sodium sulfate was then added and stirred for 1 hour. The mixture was filtered, rotary evaporated, and dried to obtain an organosilicon segment. Furthermore, in step A1, the usage ratio of 1,1,3,3-tetramethyldisiloxane, methyltrimethoxysilane, 3-aminopropyltrimethoxysilane, trifluoromethanesulfonic acid, anhydrous sodium bicarbonate, and anhydrous sodium sulfate is 0.01-0.03 mol: 0.01-0.02 mol: 0.01-0.05 mol: 0.014-0.036-0.057 g: 0.9-2.23-3.57 g: 1.4-3.6-5.7 g; Step A2: adding toluene to the organosilicon segment and stirring evenly, then adding allylamine and Custer catalyst, heating to 95-105° C. and stirring to react for 16-24 hours, rotary evaporation, extraction, and drying to obtain the amino-terminated organosilicon segment; Furthermore, in step A2, the ratio of the silicon-hydrogen bond, allylamine and Custer catalyst in the organosilicon segment is 1 mol: 1-1.02 mol: 0.01-0.015 g; Step A3: Mix diphenylmethane diisocyanate and DMF and stir evenly, add polyetheramine D400 and stir to react for 2-3 hours, then add amino-terminated organosilicon segment and stir to react for 2.5-3.5 hours to obtain isocyanate-terminated polyurea prepolymer; Furthermore, in step A3, the molar ratio of isocyanate group to amino group is 1.1-1.3:1; Furthermore, the amino group in the amino-terminated organosilicon segment in step A3 accounts for 10% to 30% of the total amino group amount of the polyetheramine D400 and the amino-terminated organosilicon segment; Step A4, ultrasonically treating 5 / 6 parts of 4-aminobutyric acid in water for 30 minutes, adding molybdenum disulfide powder and stirring for 24 hours, ultrasonically treating for 12 hours, centrifuging, collecting the supernatant, adding the remaining 4-aminobutyric acid and ultrasonically treating for 4-6 hours, centrifuging and washing, redispersing in DMF, adding the isocyanate-terminated polyurea prepolymer and stirring to react for 2.5-3.5 hours, rotary evaporation, washing, and drying to obtain an organic-inorganic hybrid modifier; Furthermore, in step A4, the usage ratio of 4-aminobutyric acid, water, molybdenum disulfide powder, DMF and isocyanate-terminated polyurea prepolymer is 15-25 g:200 mL:1-2 g:100 mL:3-6 g.
[0007] A method for preparing a scratch-resistant protective coating comprises the following steps: The raw materials are weighed in parts by weight, and acrylic resin, polyurethane acrylic resin, organic-inorganic hybrid modifier, mica powder, silane coupling agent, isopropyl alcohol and water are mixed and stirred evenly, and then a photoinitiator, a leveling agent and a defoaming agent are added and mixed and stirred evenly to obtain a scratch-resistant protective coating.
[0008] Beneficial effects of the present invention: The coating of the present invention is prepared by mixing and stirring acrylic resin and polyurethane acrylic resin as main resin matrices, and adding functional additives such as organic-inorganic hybrid modifier, mica powder, silane coupling agent, photoinitiator and water; after ultraviolet light curing, the coating has excellent adhesion, scratch resistance and high hardness, which makes the coating have good application prospects in the field of coating protection.
[0009] The coating prepared by the present invention introduces an organic-inorganic hybrid modifier with a core-shell structure. The modifier is prepared with molybdenum disulfide nanosheets as the core and a hyperbranched polyurea structure as the shell. The introduction of the hybrid structure enables the local stress to be transferred from the organic phase (hyperbranched polyurea) to the inorganic phase (molybdenum disulfide nanosheets) when the coating is scratched, and the stress is synergistically dispersed through the slip of the nanosheets and the elastic deformation of the polyurea network, thereby avoiding cracking of the coating caused by stress concentration.
[0010] The molybdenum disulfide (MoS2) in the core layer of the organic-inorganic hybrid modifier has a graphite-like layered structure, bonded by weak van der Waals forces, which facilitate slippage under shear forces, providing excellent friction reduction and lubrication. When the coating surface is scratched, the MoS2 nanosheets align and form a transfer film, reducing resistance to scratch propagation. The rigid inorganic core of the nanosheets disperses local stress, enhancing the coating's compressive strength and preventing plastic deformation upon scratching. The hyperbranched polyurea in the shell layer possesses a highly branched topology. It is formed by copolymerization of amino-terminated organosilicon segments, MDI (diphenylmethane diisocyanate), and polyetheramine D400 to form a dense cross-linked network. This structure effectively dissipates external mechanical energy (such as scratch stress) and absorbs energy through elastic deformation of the molecular chains, reducing surface damage. Furthermore, the hydrogen bonds and dynamic covalent bonds (such as urea bonds) in the polyurea structure undergo reversible breakage and recombination under stress, endowing the coating with a certain degree of self-healing ability. Minor scratches can be repaired by heat or environmental stimulation. Furthermore, the excellent toughness and impact resistance of the hyperbranched polyurea shell structure protects the MoS2 nanosheets, preventing breakage due to excessive stress and inhibiting the brittle propagation of scratches. The organic-inorganic hybrid modifier also contains free silanol groups, which chemically crosslink with the siloxane in the silane coupling agent, anchoring the modifier in the coating. DETAILED DESCRIPTION
[0011] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.
[0012] Example 1: An organic-inorganic hybrid modifier was prepared by the following steps: Step A1. Under nitrogen, 1,1,3,3-tetramethyldisiloxane, methyltrimethoxysilane, 3-aminopropyltrimethoxysilane and trifluoromethanesulfonic acid were added to a reactor and stirred at room temperature for 24 hours. Anhydrous sodium bicarbonate was added and stirred for 1.5 hours. Anhydrous sodium sulfate was then added and stirred for 1 hour. The mixture was filtered, rotary evaporated and dried to obtain an organosilicon segment. The amount ratio of 1,1,3,3-tetramethyldisiloxane, methyltrimethoxysilane, 3-aminopropyltrimethoxysilane, trifluoromethanesulfonic acid, anhydrous sodium bicarbonate and anhydrous sodium sulfate was 0.01 mol: 0.01 mol: 0.01 mol: 0.014 g: 0.9 g: 1.4 g. Step A2: Add toluene to the organosilicon segment and stir evenly, then add allylamine and Custer catalyst, and heat to 95° C. and stir for 16 hours. Rotary evaporate, extract, and dry to obtain an amino-terminated organosilicon segment. The ratio of silicon-hydrogen bond, allylamine, and Custer catalyst in the organosilicon segment is 1 mol:1:0.01 g. Step A3: Diphenylmethane diisocyanate and DMF were mixed and stirred uniformly, polyetheramine D400 was added and stirred for 2 hours, and then amino-terminated organosilicon segments were added and stirred for 2.5 hours to obtain an isocyanate-terminated polyurea prepolymer. The molar ratio of isocyanate groups to amino groups in the system was 1.1:1, and the amino groups in the amino-terminated organosilicon segments accounted for 10% of the total amino groups in the polyetheramine D400 and the amino-terminated organosilicon segments. Step A4, ultrasonicate 5 / 6 parts of 4-aminobutyric acid in water for 30 minutes, add molybdenum disulfide powder and stir for 24 hours, ultrasonicate for 12 hours, centrifuge, collect the supernatant, add the remaining 4-aminobutyric acid and ultrasonicate for 4 hours, centrifuge and wash, redisperse in DMF, add terminal isocyanate group polyurea prepolymer and stir to react for 2.5 hours, rotary evaporation, washing, and drying to obtain an organic-inorganic hybrid modifier, and the amount ratio of 4-aminobutyric acid, water, molybdenum disulfide powder, DMF and terminal isocyanate group polyurea prepolymer is 15g:200mL:1g:100mL:3g.
[0013] Example 2: An organic-inorganic hybrid modifier was prepared by the following steps: Step A1. Under nitrogen, 1,1,3,3-tetramethyldisiloxane, methyltrimethoxysilane, 3-aminopropyltrimethoxysilane and trifluoromethanesulfonic acid were added to a reactor and stirred at room temperature for 24 hours. Anhydrous sodium bicarbonate was added and stirred for 1.5 hours. Anhydrous sodium sulfate was then added and stirred for 1 hour. The mixture was filtered, rotary evaporated and dried to obtain an organosilicon segment. The amount ratio of 1,1,3,3-tetramethyldisiloxane, methyltrimethoxysilane, 3-aminopropyltrimethoxysilane, trifluoromethanesulfonic acid, anhydrous sodium bicarbonate and anhydrous sodium sulfate was 0.02 mol: 0.015 mol: 0.03 mol: 0.036 g: 2.23 g: 3.6 g. Step A2: Add toluene to the organosilicon segment and stir evenly, then add allylamine and Custer catalyst, and heat to 100° C. and stir for 20 hours. Rotary evaporate, extract, and dry to obtain an amino-terminated organosilicon segment. The ratio of silicon-hydrogen bond, allylamine, and Custer catalyst in the organosilicon segment is 1 mol:1.01 mol:0.013 g. Step A3: Diphenylmethane diisocyanate and DMF were mixed and stirred uniformly, polyetheramine D400 was added and stirred for 2.5 hours, and then amino-terminated organosilicon segments were added and stirred for 3 hours to obtain an isocyanate-terminated polyurea prepolymer. The molar ratio of isocyanate groups to amino groups in the system was 1.2:1, and the amino groups in the amino-terminated organosilicon segments accounted for 20% of the total amino groups in the polyetheramine D400 and the amino-terminated organosilicon segments. Step A4, ultrasonicate 5 / 6 parts of 4-aminobutyric acid in water for 30 minutes, add molybdenum disulfide powder and stir for 24 hours, ultrasonicate for 12 hours, centrifuge, collect the supernatant, add the remaining 4-aminobutyric acid and ultrasonicate for 5 hours, centrifuge and wash, redisperse in DMF, add terminal isocyanate polyurea prepolymer and stir to react for 3 hours, rotary evaporation, washing, and drying to obtain an organic-inorganic hybrid modifier, wherein the amount ratio of 4-aminobutyric acid, water, molybdenum disulfide powder, DMF and terminal isocyanate polyurea prepolymer is 20g:200mL:1.5g:100mL:4.5g.
[0014] Example 3: An organic-inorganic hybrid modifier was prepared by the following steps: Step A1. Under nitrogen, 1,1,3,3-tetramethyldisiloxane, methyltrimethoxysilane, 3-aminopropyltrimethoxysilane and trifluoromethanesulfonic acid were added to a reactor and stirred at room temperature for 24 hours. Anhydrous sodium bicarbonate was added and stirred for 1.5 hours. Anhydrous sodium sulfate was then added and stirred for 1 hour. The mixture was filtered, rotary evaporated and dried to obtain an organosilicon segment. The amount ratio of 1,1,3,3-tetramethyldisiloxane, methyltrimethoxysilane, 3-aminopropyltrimethoxysilane, trifluoromethanesulfonic acid, anhydrous sodium bicarbonate and anhydrous sodium sulfate was 0.03 mol: 0.02 mol: 0.05 mol: 0.057 g: 3.57 g: 5.7 g. Step A2: Toluene was added to the organosilicon segment and stirred evenly. Allylamine and Custer catalyst were then added, and the temperature was raised to 105° C. and stirred for 24 hours. The mixture was rotary evaporated, extracted, and dried to obtain an amino-terminated organosilicon segment. The ratio of the silicon-hydrogen bond, allylamine, and Custer catalyst in the organosilicon segment was 1 mol:1.02 mol:0.015 g. Step A3: Diphenylmethane diisocyanate and DMF were mixed and stirred uniformly, polyetheramine D400 was added and stirred for 3 hours, and then amino-terminated organosilicon segments were added and stirred for 3.5 hours to obtain an isocyanate-terminated polyurea prepolymer. The molar ratio of isocyanate groups to amino groups in the system was 1.3:1, and the amino groups in the amino-terminated organosilicon segments accounted for 30% of the total amino groups in the polyetheramine D400 and the amino-terminated organosilicon segments. Step A4, ultrasonicate 5 / 6 parts of 4-aminobutyric acid in water for 30 minutes, add molybdenum disulfide powder and stir for 24 hours, ultrasonicate for 12 hours, centrifuge, collect the supernatant, add the remaining 4-aminobutyric acid and ultrasonicate for 6 hours, centrifuge and wash, redisperse in DMF, add terminal isocyanate group polyurea prepolymer and stir to react for 3.5 hours, rotary evaporation, washing, and drying to obtain an organic-inorganic hybrid modifier, and the amount ratio of 4-aminobutyric acid, water, molybdenum disulfide powder, DMF and terminal isocyanate group polyurea prepolymer is 25g:200mL:2g:100mL:6g.
[0015] Example 4: A method for preparing a scratch-resistant protective coating comprises the following steps: 25 parts of acrylic resin, 10 parts of polyurethane acrylic resin, 6 parts of the organic-inorganic hybrid modifier prepared in Example 1, 1.5 parts of mica powder, 0.5 parts of KH-570, 2.5 parts of photoinitiator TPO, 0.5 parts of Digo 110 leveling agent, 0.3 parts of TEGO Foamex825, 3.5 parts of isopropyl alcohol, and 15 parts of water; The raw materials were weighed in parts by weight, and acrylic resin, polyurethane acrylic resin, the organic-inorganic hybrid modifier prepared in Example 1, mica powder, silane coupling agent KH-570, isopropyl alcohol, and water were mixed and stirred uniformly. Then, photoinitiator TPO, Digo 110 leveling agent, and TEGO Foamex 825 were added and mixed and stirred uniformly to obtain a scratch-resistant protective coating.
[0016] Example 5: A method for preparing a scratch-resistant protective coating comprises the following steps: 30 parts of acrylic resin, 13 parts of polyurethane acrylic resin, 8 parts of the organic-inorganic hybrid modifier prepared in Example 2, 2.5 parts of mica powder, 1 part of vinyltrimethoxysilane, 3 parts of photoinitiator 184, 0.8 parts of Digo 110 leveling agent, 0.5 parts of TEGO Foamex 825, 5.5 parts of isopropyl alcohol, and 20 parts of water; The raw materials were weighed by weight parts, the acrylic resin, the polyurethane acrylic resin, the organic-inorganic hybrid modifier prepared in Example 2, the mica powder, the silane coupling agent vinyltrimethoxysilane, isopropyl alcohol and water were mixed and stirred uniformly, then the photoinitiator 184, the DiGol 110 leveling agent and the TEGO Foamex 825 were added and mixed and stirred uniformly, to obtain the scratch-resistant protective coating.
[0017] Example 6: A method for preparing a scratch-resistant protective coating comprises the following steps: The acrylic resin 35 parts, the polyurethane acrylic resin 16 parts, the organic-inorganic hybrid modifier prepared in Example 3 10 parts, the mica powder 3.5 parts, KH-570 1.5 parts, the photoinitiator TPO 3.5 parts, the DiGol 110 leveling agent 1 part, the TEGO Foamex 825 0.6 parts, isopropyl alcohol 7.5 parts and water 25 parts were weighed by weight parts, and then mixed and stirred uniformly, to obtain the scratch-resistant protective coating. The raw materials were weighed by weight parts, the acrylic resin, the polyurethane acrylic resin, the organic-inorganic hybrid modifier prepared in Example 3, the mica powder, the silane coupling agent KH-570, isopropyl alcohol and water were mixed and stirred uniformly, then the photoinitiator TPO, the DiGol 110 leveling agent and the TEGO Foamex 825 were added and mixed and stirred uniformly, to obtain the scratch-resistant protective coating.
[0018] Comparative Example 1: This comparative example is a scratch-resistant protective coating, which is different from Example 6 in that the organic-inorganic hybrid modifier prepared in Example 3 is replaced by molybdenum disulfide nanosheets, and the rest are the same.
[0019] Comparative Example 2: This comparative example is a scratch-resistant protective coating, which is different from Example 6 in that the organic-inorganic hybrid modifier prepared in Example 3 is replaced by polyurea, and the rest are the same. The polyurea was prepared by the following steps: diphenylmethane diisocyanate and DMF were mixed and stirred uniformly, polyetheramine D400 was added and stirred for 4-5 h, to obtain the polyurea, wherein the molar ratio of isocyanate to amino group was 1.04:1.
[0020] The scratch-resistant protective coatings prepared in Examples 4-6 and Comparative Examples 1-2 were coated on a 250um PC substrate by precise micro-recess coating, the drying temperature was about 90℃*4min (stepwise heating), the curing energy was 450mJ / cm 2 , the dry film thickness was 20um, and the performance of the coating film was tested. Scratch resistance test: Baoliang 0000# steel wool was used, the contact head was 2cm*2cm, and the maximum reciprocating number without friction scratch under 1000g load was tested. Adhesion test: tested according to GB / T 9286 1998 "Cross-hatch test for paint and varnish films". Hardness test: Test according to GB / T 6739-2022 “Paints and varnishes - determination of film hardness by pencil method”; The test results are shown in Table 1: Table 1: Performance test results As can be seen from Table 1, the scratch-resistant protective coating prepared by the present invention not only has excellent adhesion and hardness, but also has excellent scratch resistance, and can be used in the fields of building furniture, plastic housings, etc.
[0021] The above content is merely an example and explanation of the concept of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the scope defined by the concept of the invention, they should all fall within the scope of protection of the present invention.
Claims
1. A scratch-resistant protective coating, characterized in that: The invention comprises the following raw materials in parts by weight: 25-35 parts of acrylic resin, 10-16 parts of polyurethane acrylic resin, 6-10 parts of organic-inorganic hybrid modifier, 1.5-3.5 parts of mica powder, 0.5-1.5 parts of silane coupling agent, 2.5-3.5 parts of photoinitiator, 0.5-1 part of leveling agent, 0.3-0.6 part of defoaming agent, 3.5-7.5 parts of isopropyl alcohol, and 15-25 parts of water; The organic-inorganic hybrid modifier is prepared by reacting molybdenum disulfide nanosheets modified with 4-aminobutyric acid with an isocyanate-terminated polyurea prepolymer. The isocyanate-terminated polyurea prepolymer is prepared by reacting diphenylmethane diisocyanate, polyetheramine D400, and an amino-terminated organic silicon segment. The amino-terminated organic silicon segment is prepared by reacting an organic silicon segment with allylamine through a hydrosilylation reaction. The organic silicon segment is prepared by reacting 1,1,3,3-tetramethyldisiloxane, methyltrimethoxysilane, and 3-aminopropyltrimethoxysilane.
2. The scratch-resistant protective coating according to claim 1, characterized in that: The organic-inorganic hybrid modifier is prepared by the following steps: Step A1: Under nitrogen, 1,1,3,3-tetramethyldisiloxane, methyltrimethoxysilane, 3-aminopropyltrimethoxysilane, and trifluoromethanesulfonic acid were added to a reactor and stirred at room temperature for 24 hours. Anhydrous sodium bicarbonate was added and stirred for 1.5 hours. Anhydrous sodium sulfate was then added and stirred for 1 hour. The mixture was filtered, rotary evaporated, and dried to obtain an organosilicon segment. Step A2: adding toluene to the organosilicon segment and stirring evenly, then adding allylamine and Custer catalyst, heating to 95-105° C. and stirring to react for 16-24 hours, rotary evaporation, extraction, and drying to obtain the amino-terminated organosilicon segment; Step A3: Mix diphenylmethane diisocyanate and DMF and stir evenly, add polyetheramine D400 and stir to react for 2-3 hours, then add amino-terminated organosilicon segment and stir to react for 2.5-3.5 hours to obtain isocyanate-terminated polyurea prepolymer; Step A4, ultrasonically dissolve 5 / 6 parts of 4-aminobutyric acid in water for 30 minutes, add molybdenum disulfide powder and stir for 24 hours, ultrasonically dissolve for 12 hours, centrifuge, collect the supernatant, add the remaining 4-aminobutyric acid and ultrasonically dissolve for 4-6 hours, centrifuge and wash, redisperse in DMF, add the terminal isocyanate polyurea prepolymer and stir to react for 2.5-3.5 hours, rotary evaporate, wash, and dry to obtain an organic-inorganic hybrid modifier.
3. The scratch-resistant protective coating according to claim 2, characterized in that: In step A1, the usage ratio of 1,1,3,3-tetramethyldisiloxane, methyltrimethoxysilane, 3-aminopropyltrimethoxysilane, trifluoromethanesulfonic acid, anhydrous sodium bicarbonate, and anhydrous sodium sulfate is 0.01-0.03 mol: 0.01-0.02 mol: 0.01-0.05 mol: 0.014-0.036-0.057 g: 0.9-2.23-3.57 g: 1.4-3.6-5.7 g.
4. The scratch-resistant protective coating according to claim 2, characterized in that: In step A2, the ratio of the silicon-hydrogen bond, allylamine and Custer catalyst in the organosilicon segment is 1 mol: 1-1.02 mol: 0.01-0.015 g.
5. The scratch-resistant protective coating according to claim 2, characterized in that: In step A3, the molar ratio of isocyanate group to amino group is 1.1-1.3:
1.
6. The scratch-resistant protective coating according to claim 2, characterized in that: The amino group in the amino-terminated organosilicon segment in step A3 accounts for 10%-30% of the total amino group amount of the polyetheramine D400 and the amino-terminated organosilicon segment.
7. The scratch-resistant protective coating according to claim 2, characterized in that: In step A4, the usage ratio of 4-aminobutyric acid, water, molybdenum disulfide powder, DMF and isocyanate-terminated polyurea prepolymer is 15-25 g:200 mL:1-2 g:100 mL:3-6 g.
8. The scratch-resistant protective coating according to claim 1, characterized in that: The silane coupling agent is one of KH-570 and vinyl trimethoxysilane, and the photoinitiator is one of photoinitiator TPO and photoinitiator 184.
9. The scratch-resistant protective coating according to claim 1, characterized in that: The leveling agent is Tego 110 leveling agent, and the defoaming agent is TEGO Foamex 825.
10. A method for preparing the scratch-resistant protective coating according to any one of claims 1 to 9, characterized in that: The following steps are involved: The raw materials are weighed in parts by weight, and acrylic resin, polyurethane acrylic resin, organic-inorganic hybrid modifier, mica powder, silane coupling agent, isopropyl alcohol and water are mixed and stirred evenly, and then a photoinitiator, a leveling agent and a defoaming agent are added and mixed and stirred evenly to obtain a scratch-resistant protective coating.