Scratch-resistant waterborne art paint and method of making the same

Abstract

The present application provides a kind of scratch-resistant water-based art paint and its preparation method, the raw materials for preparing the scratch-resistant water-based art paint include: alcohol material, isocyanate material, disulfide, silicone modifier, colorant, additive, solvent, wherein, according to mass ratio, alcohol material: isocyanate material: disulfide=0.6~1.6:1~2:0.2~0.5; alcohol material includes rapeseed oil based polyol, the molecular structure of disulfide contains at least one amino group, and the silicone modifier includes hexadecyl trimethoxysilane.The scratch-resistant water-based art paint prepared coating has excellent scratch resistance and high wear resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of paint technology, and particularly relates to a scratch-resistant water-based artistic paint and a preparation method thereof. BACKGROUND

[0002] With the development of economy and the improvement of people's living standards, the protective effect of coating materials is paid more and more attention. The surface coating of building materials, automobiles, marine facilities, instruments and equipment is easily subjected to human impact, sand, washing and other scratching behaviors in the process of use and transportation, resulting in scratches and loss of luster of the coating, affecting its protective function and aesthetic appearance. However, in order to improve the scratch resistance of the coating, the wear resistance of the coating is often sacrificed.

[0003] Therefore, it is necessary to seek a kind of coating, which has high wear resistance and high scratch resistance. SUMMARY

[0004] The present application aims to provide a scratch-resistant water-based artistic paint and a preparation method thereof, and the scratch-resistant water-based artistic paint has excellent scratch resistance and high wear resistance.

[0005] According to one aspect of the present application, a scratch-resistant water-based artistic paint is provided, and the raw materials for preparing the scratch-resistant water-based artistic paint include: alcohol materials, isocyanate materials, disulfide, silicone modifier, colorant, additive, and solvent, wherein, according to the mass ratio, the alcohol materials, the isocyanate materials, and the disulfide are in a ratio of 0.6-1.6:1-2:0.2-0.5; the alcohol materials include rapeseed oil-based polyol, the disulfide has at least one amino group in the molecular structure, and the silicone modifier includes hexadecyl trimethoxysilane.

[0006] The scratch-resistant water-based artistic paint provided by the present application adopts safe and environmentally friendly raw materials, and the coating formed by the scratch-resistant water-based artistic paint has the properties of scratch resistance, water resistance, and yellowing resistance. The hydrolysis reaction of the organic silicon modifier can introduce the organic silicon modifier into the scratch-resistant water-based artistic paint, which can not only improve the crosslinking degree of the scratch-resistant water-based artistic paint, but also improve the water resistance and yellowing resistance of the coating. Since the mass ratio of the alcohol material to the isocyanate material falls within the above range, the polyurethane prepolymer prepared from the alcohol material and the isocyanate material is NCO-terminated. Therefore, the amino group in the disulfide reacts with the NCO group of the polyurethane prepolymer, thereby introducing a dynamic disulfide bond into the scratch-resistant water-based artistic paint. The dynamic disulfide bond in the coating can exchange between the broken state and the bonded state. When the coating formed by the scratch-resistant water-based artistic paint is scratched or scratched, the broken-state disulfide bond in the coating can reactivate other dynamic bonds at room temperature, so that the broken-state disulfide bond is re-bonded, thereby improving the scratch resistance of the coating. In addition, by using rapeseed oil-based polyol and the above-mentioned materials to prepare the coating, not only the use of petroleum-based products is reduced, but also the yellowing resistance of the coating is improved. Moreover, due to the high crosslinking degree between the rapeseed oil-based polyol and the isocyanate material, the disulfide, and the organic silicon modifier, the coating formed after curing has good wear resistance and high hardness.

[0007] Preferably, the molecular structure of the disulfide contains an aromatic group. The introduction of the disulfide containing an aromatic group into the scratch-resistant water-based artistic paint can also improve the crosslinking density and wear resistance of the coating, and can slow down the speed of water in the external environment penetrating the paint film, thereby enhancing the water resistance of the coating.

[0008] Preferably, the disulfide is bis(2-aminophenyl) disulfide. When bis(2-aminophenyl) disulfide is used as the disulfide to prepare the scratch-resistant water-based artistic paint, the wear resistance and surface hardness of the coating can be improved. The amino group in bis(2-aminophenyl) disulfide has high reactivity, which promotes the reaction between the amino group and the NCO group of the polyurethane prepolymer and reduces the occurrence of side reactions.

[0009] Preferably, the isocyanate material includes isophorone diisocyanate and dicyclohexylmethane diisocyanate, and the molar ratio of isophorone diisocyanate to dicyclohexylmethane diisocyanate is 1:1.5-2.5.

[0010] Preferably, the alcohol material further includes polyether polyol, and the mass ratio of the polyether polyol to the rapeseed oil-based polyol is 0.9-1.1:0.9-1.1.

[0011] Preferably, the rapeseed oil-based polyol is prepared by the following steps: mixing rapeseed oil, hydrogen peroxide and a catalyst to perform an epoxidation reaction to obtain epoxidized rapeseed oil; mixing the epoxidized rapeseed oil with an alkenoic material to perform an opening ring reaction at a temperature of 160-190℃ to obtain a rapeseed oil-based prepolymer; mixing the rapeseed oil-based prepolymer with thioglycerol and a photoinitiator to perform a thiol-ene click reaction under light to obtain the rapeseed oil-based polyol, wherein the mass ratio of the rapeseed oil-based prepolymer to the thioglycerol is 5-7:1-1.3. The rapeseed oil-based polyol obtained by the above operation has the advantages of green environmental protection, energy saving and emission reduction, and renewable raw materials. The scratch-resistant water-based artistic paint prepared by using the rapeseed oil-based polyol can also improve the yellowing resistance, scratch resistance and surface hardness of the coating. The chemical structure of rapeseed oil contains many carbon-carbon double bonds. In the epoxidation reaction, hydrogen peroxide is used as the oxygen source to add an oxygen atom between the two end carbon atoms of the carbon-carbon double bond in the rapeseed oil to form a three-membered ring to obtain epoxidized rapeseed oil. The molecular structure of the alkenoic material contains at least one carbon-carbon double bond and one carboxyl group. The epoxy group in the epoxidized rapeseed oil is attacked by the carboxyl group in the alkenoic material to perform an opening ring reaction, thereby introducing the carbon-carbon double bond in the alkenoic material into the epoxidized rapeseed oil. In the thiol-ene click reaction, the photoinitiator is cleaved to form free radicals under light, and the free radicals abstract the hydrogen atom on the thiol group of the thioglycerol to generate thiol free radicals. The thiol free radicals attack the carbon-carbon double bond (i.e. the carbon-carbon double bond introduced in the opening ring reaction) in the rapeseed oil-based prepolymer to form the rapeseed oil-based polyol. Thus, by using the thiol-ene click reaction, the content of hydroxyl groups in the rapeseed oil-based polyol can be increased, the reaction sites of the rapeseed oil-based polyol with isocyanate materials can be increased, and the compactness and surface hardness of the coating can be improved. Moreover, the rapeseed oil-based polyol is introduced with sulfur elements, which increases the possibility of forming hydrogen bonds and disulfide bonds in the coating, and improves the scratch resistance and yellowing resistance of the coating.

[0012] Preferably, in the epoxidation reaction, the mass ratio of the rapeseed oil to the hydrogen peroxide is 2-4:1.7.

[0013] Preferably, the reaction temperature of the epoxidation reaction is 25-30℃, and the reaction time is 20-26 hours.

[0014] Preferably, in the opening ring reaction, the alkenoic material is any one of 7-octenoic acid, 8-nonenoic acid and 9-decenoic acid. The carbon-carbon double bond and the carboxyl group in the above alkenoic material are separated by multiple carbon atoms, which can reduce the spatial crowding degree of the reactants and improve the reaction rate in the thiol-ene click reaction. Moreover, when the above alkenoic material is used to prepare the rapeseed oil-based polyol, the carbon-carbon double bond of the rapeseed oil-based prepolymer prepared thereby is located at the end of the branched chain, which has high reactivity.

[0015] Preferably, the mass ratio of the epoxy canola oil to the olefinic material during the ring-opening reaction is 2-4:1.4-1.8.

[0016] Preferably, the reaction time of the ring-opening reaction is 7-9 hours.

[0017] Preferably, the mass ratio of the canola oil-based prepolymer to the photoinitiator is 1:0.04-0.06 during the thiol-ene click reaction. When the above amount of photoinitiator is used to prepare the canola oil-based polyol, the thiol-ene click reaction is promoted, and the reaction of the thiol and the double bond is facilitated. If the amount of the photoinitiator is too small, a long reaction time is required, which affects the production efficiency. If the amount of the photoinitiator is too high, the raw material cost is too high, which is not conducive to economic benefits.

[0018] Preferably, the reaction temperature of the thiol-ene click reaction is 30-40℃, and the reaction time is 4-6 hours. As the temperature rises, the reactivity of the double bond and the thiol increases, and the migration efficiency of the photoinitiator increases, thereby increasing the reaction rate. However, when the reaction temperature is too high, it is not conducive to controlling the reaction progress and side reactions are prone to occur. Therefore, by adjusting the reaction temperature of the thiol-ene click reaction to 30-40℃ and the reaction time to 4-6 hours, the reaction progress can be better controlled, which is conducive to large-scale production.

[0019] According to another aspect of the present application, a preparation method of the above-described scratch-resistant water-based artistic paint is provided, which comprises the following operations: weighing the raw materials for preparing the scratch-resistant water-based artistic paint; pre-polymerizing the alcohol material, the isocyanate material, and the organosilicon modifier at a temperature of 70-80℃ to obtain a polyurethane prepolymer; adding a disulfide to the polyurethane prepolymer, keeping the reaction temperature at 55-65℃, and stopping the reaction until the isocyanate value in the reaction system is 0, thereby obtaining the scratch-resistant water-based artistic paint. The present scheme controls the reaction progress by stepwise feeding, and the above-described preparation process is simple, convenient to operate, and mild in conditions, and has good economic benefits. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions of the present application will be described clearly and completely below in combination with the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0021] Embodiment 1

[0022] The present embodiment provides a scratch-resistant water-based artistic paint, and the specific preparation method is as follows:

[0023] (1) Preparation of rapeseed oil-based polyol:

[0024] S1. Mix rapeseed oil with hydrogen peroxide and catalyst to perform epoxidation reaction at a temperature of 25℃ for 24 hours to obtain epoxidized rapeseed oil; wherein the mass ratio of rapeseed oil to hydrogen peroxide is 3:1.7, and the catalyst is formic acid.

[0025] S2. Mix epoxidized rapeseed oil with olefinic acid to perform ring-opening reaction at a temperature of 180℃ for 8 hours to obtain rapeseed oil-based prepolymer; wherein the mass ratio of epoxidized rapeseed oil to olefinic acid is 3.1:1.5, and the olefinic acid is 9-heptadecenoic acid.

[0026] S3. Mix rapeseed oil-based prepolymer with thioglycerol and photoinitiator to perform thiol-ene click reaction at a temperature of 35℃ and under light conditions for 5 hours to obtain rapeseed oil-based polyol; wherein the mass ratio of rapeseed oil-based prepolymer to thioglycerol is 5.7:1.1, and the mass ratio of rapeseed oil-based prepolymer to photoinitiator is 1:0.05.

[0027] (2) Preparation of scratch-resistant water-based artistic paint:

[0028] The raw materials for preparing the scratch-resistant water-based artistic paint include alcohol materials, isocyanate materials, disulfide, silicone modifier, colorant, additive, and solvent. The alcohol materials are polyether polyol and the above-mentioned rapeseed oil-based polyol, and the mass ratio of polyether polyol to the above-mentioned rapeseed oil-based polyol is 1:1. The isocyanate materials are isophorone diisocyanate and dicyclohexylmethane diisocyanate, and the molar ratio of isophorone diisocyanate to dicyclohexylmethane diisocyanate is 1:2. The disulfide is bis(2-aminophenyl) disulfide, and the silicone modifier is hexadecyl trimethoxysilane. The mass ratio of alcohol materials: isocyanate materials: disulfide is 1.2:1.5:0.4, and the mass ratio of alcohol materials to silicone modifier is 1:0.3.

[0029] The scratch-resistant water-based artistic paint is prepared by the following steps:

[0030] S1. Weigh the raw materials for preparing the scratch-resistant water-based artistic paint;

[0031] S2. Prepolymerize the alcohol materials, isocyanate materials, part of the solvent, and the silicone modifier at a temperature of 75℃ to obtain polyurethane prepolymer;

[0032] S3. Add disulfide and the remaining raw materials to the polyurethane prepolymer, and maintain the reaction temperature at 60℃ until the isocyanate value in the reaction system is 0 to obtain the scratch-resistant water-based artistic paint.

[0033] In the present embodiment, the types and dosages of colorants, additives and solvents can be adjusted according to actual production conditions, provided that the normal preparation and use of the scratch-resistant water-based artistic paint are not affected.

[0034] Example 2

[0035] The present embodiment refers to the preparation method provided in Example 1 to prepare a scratch-resistant water-based artistic paint. The difference between the present embodiment and Example 1 is that, in the process of preparing the scratch-resistant water-based artistic paint, the dosages of raw materials are adjusted so that the mass ratio of alcohol materials, isocyanate materials and disulfide is 0.6:1:0.2. The rest of the raw material ratios and the preparation method are strictly consistent with those of Example 1.

[0036] Example 3

[0037] The present embodiment refers to the preparation method provided in Example 1 to prepare a scratch-resistant water-based artistic paint. The difference between the present embodiment and Example 1 is that, in the process of preparing the scratch-resistant water-based artistic paint, the dosages of raw materials are adjusted so that the mass ratio of alcohol materials, isocyanate materials and disulfide is 1.6:2:0.5. The rest of the raw material ratios and the preparation method are strictly consistent with those of Example 1.

[0038] Example 4

[0039] The present embodiment refers to the preparation method provided in Example 1 to prepare a scratch-resistant water-based artistic paint. The difference between the present embodiment and Example 1 is that, in the process of preparing the scratch-resistant water-based artistic paint, equimolar 3,3'-dithiodipropylamine is used instead of disulfide in Example 1. The rest of the raw material ratios and the preparation method are strictly consistent with those of Example 1.

[0040] Example 5

[0041] The present embodiment refers to the preparation method provided in Example 1 to prepare a scratch-resistant water-based artistic paint. The difference between the present embodiment and Example 1 is that, in the process of preparing rapeseed oil-based polyol S3, the addition amount of thioglycerol is adjusted so that the mass ratio of rapeseed oil-based prepolymer to the thioglycerol is 5:1.3. The rest of the raw material ratios and the preparation method are strictly consistent with those of Example 1.

[0042] Example 6

[0043] The present embodiment refers to the preparation method provided in Example 1 to prepare a scratch-resistant water-based artistic paint. The difference between the present embodiment and Example 1 is that, in the process of preparing rapeseed oil-based polyol S3, the addition amount of thioglycerol is adjusted so that the mass ratio of rapeseed oil-based prepolymer to the thioglycerol is 6.5:1. The rest of the raw material ratios and the preparation method are strictly consistent with those of Example 1.

[0044] Example 7

[0045] This example refers to the preparation method provided in Example 1 to prepare a scratch-resistant water-based artistic paint. The difference between this example and Example 1 is that in the process of preparing the rapeseed oil-based polyol in S3, equimolar amounts of 7-octenoic acid are used instead of the alkenoic acid material in Example 1. The remaining raw material ratios and preparation methods are strictly consistent with Example 1.

[0046] Example 8

[0047] This example refers to the preparation method provided in Example 1 to prepare a scratch-resistant water-based artistic paint. The difference between this example and Example 1 is that in the process of preparing the rapeseed oil-based polyol in S3, the amount of photoinitiator is adjusted so that the mass ratio of rapeseed oil-based prepolymer to the photoinitiator is 1:0.04. The remaining raw material ratios and preparation methods are strictly consistent with Example 1.

[0048] Example 9

[0049] This example refers to the preparation method provided in Example 1 to prepare a scratch-resistant water-based artistic paint. The difference between this example and Example 1 is that in the process of preparing the rapeseed oil-based polyol in S3, the amount of photoinitiator is adjusted so that the mass ratio of rapeseed oil-based prepolymer to the photoinitiator is 1:0.06. The remaining raw material ratios and preparation methods are strictly consistent with Example 1.

[0050] Example 10

[0051] This example refers to the preparation method provided in Example 1 to prepare a scratch-resistant water-based artistic paint. The difference between this example and Example 1 is that in the process of preparing the rapeseed oil-based polyol, the thiol-ene click reaction of S3 is omitted. And in the process of preparing the scratch-resistant water-based artistic paint, equimolar amounts of rapeseed oil-based prepolymer are used instead of the rapeseed oil-based polyol in Example 1. The remaining raw material ratios and preparation methods are strictly consistent with Example 1.

[0052] Comparative Example 1

[0053] This comparative example refers to the preparation method provided in Example 1 to prepare a paint. The difference between this comparative example and Example 1 is that in the process of preparing the scratch-resistant water-based artistic paint, the amount of raw materials is adjusted so that the mass ratio of alcohol material, isocyanate material, and disulfide is 0.5:1:0.2. The remaining raw material ratios and preparation methods are strictly consistent with Example 1.

[0054] Comparative Example 2

[0055] A coating was prepared according to the preparation method provided in Example 1. The difference between the present comparative example and Example 1 was that the mass ratio of the alcohol material, the isocyanate material and the disulfide was adjusted to 1.8:2:0.6 during the preparation of the scratch-resistant water-based artistic coating. The rest of the raw material ratio and the preparation method were strictly kept consistent with Example 1.

[0056] Comparative Example 3

[0057] A coating was prepared according to the preparation method provided in Example 1. The difference between the present comparative example and Example 1 was that the mass ratio of the alcohol material, the isocyanate material and the disulfide was adjusted to 1.8:2:0.6 during the preparation of the scratch-resistant water-based artistic coating. The rest of the raw material ratio and the preparation method were strictly kept consistent with Example 1.

[0058] Comparative Example 4

[0059] A coating was prepared according to the preparation method provided in Example 1. The difference between the present comparative example and Example 1 was that the mass ratio of the alcohol material, the isocyanate material and the disulfide was adjusted to 1.8:2:0.6 during the preparation of the scratch-resistant water-based artistic coating. The rest of the raw material ratio and the preparation method were strictly kept consistent with Example 1.

[0060] Comparative Example 5

[0061] A coating was prepared according to the preparation method provided in Example 1. The difference between the present comparative example and Example 1 was that the mass ratio of the alcohol material, the isocyanate material and the disulfide was adjusted to 1.8:2:0.6 during the preparation of the scratch-resistant water-based artistic coating. The rest of the raw material ratio and the preparation method were strictly kept consistent with Example 1.

[0062] Test Example

[0063] Tested objects: the scratch-resistant water-based artistic coatings provided in Examples 1-10 and the coatings provided in Comparative Examples 1-5.

[0064] Test items:

[0065] (1) Hardness: The pencil hardness of the coating prepared from the tested object was tested according to GB / T 6739-2006.

[0066] (2) Scratch resistance: The scratch resistance of the coating prepared from the tested object was tested according to GB / T 9279-2007.

[0067] (3) Anti-yellowing property: According to the test method in GB / T 23987-2009 Artificial Weathering Exposure of Pigmented Overcoat Films Exposure to Fluorescent UV and Water, the coating layers prepared from each of the test objects were placed in a fluorescent UV aging machine with dry phase (no condensation) at (60 ± 3) °C, irradiance of 0.68 W / m 2 , and continuous light for 168 hours. After irradiation, the coating layers were taken out and compared with the coating layers without light exposure. The color change (ΔE) was recorded.

[0068] Test results: As shown in Table 1.

[0069] Table 1. Test results of the properties of the coating layers prepared from each of the test objects

[0070]

[0071]

[0072] Result analysis:

[0073] Comparing the coating layers prepared from the scratch-resistant water-based artistic paints of Examples 1-10 with the coating layers prepared from Comparative Examples 1-5, it can be found that the coating layers of Examples 1-10 have higher wear resistance and scratch resistance. The coating layer provided by Example 1 exhibits the best overall performance, not only having high surface hardness, good wear resistance and scratch resistance, but also being less prone to yellowing.

[0074] Comparing the properties of Examples 1-3 with Comparative Examples 1-2 in Table 1, it can be found that the coating layers provided by Examples 1-3 have higher wear resistance and scratch resistance compared to the coating layers of Comparative Examples 1-2. This indicates that when the mass ratio of the alcohol material, isocyanate material and disulfide in the raw materials for preparing the scratch-resistant water-based artistic paint falls within the range of 0.6-1.6: 1-2: 0.2-0.5, the coating layer formed by the scratch-resistant water-based artistic paint has good wear resistance, scratch resistance and anti-yellowing property.

[0075] Comparing the properties of Example 1 with Comparative Examples 3 and 4, it can be found that using different organosilicon modifiers or disulfides to prepare the scratch-resistant water-based artistic paint will affect the overall performance of the coating layer. Compared with Comparative Examples 3 and 4, the coating layer provided by Example 1 has better anti-yellowing property and wear resistance, and is less likely to leave scratches. This indicates that using hexadecyltrimethoxysilane as an organosilicon modifier and using a disulfide containing amino groups to prepare the paint can improve the wear resistance, scratch resistance and anti-yellowing property of the coating layer.

[0076] Comparing Example 1, Example 10 with Comparative Example 5, it can be found that the coating of Example 1 and Example 10 containing rapeseed oil based polyol in the alcohol material has better surface hardness and scratch resistance. Among them, the coating in Example 1 also has higher yellowing resistance. Therefore, it is illustrated that compared with the coating prepared by using conventional rapeseed oil based polyol, the coating prepared by using rapeseed oil based polyol containing sulfur element has better yellowing resistance.

[0077] The above examples are only used to illustrate the technical solutions of the present application, but not to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A mar resistant waterborne artistic paint, characterized by, The raw materials for preparing the scratch-resistant water-based artistic paint include alcohol materials, isocyanate materials, disulfides, silicone modifiers, pigments, additives, and solvents, wherein the alcohol materials, the isocyanate materials, and the disulfides are in a mass ratio of 0.6-1.6:1-2:0.2-0.5; The alcohol materials include rapeseed oil-based polyols, the disulfides have at least one amino group in the molecular structure, and the silicone modifiers include hexadecyl trimethoxysilane. The rapeseed oil-based polyols are prepared by the following steps: Mixing rapeseed oil with hydrogen peroxide and a catalyst to perform an epoxidation reaction to obtain epoxidized rapeseed oil; Mixing the epoxidized rapeseed oil with olefinic acid materials to perform an opening ring reaction at a temperature of 160-190°C to obtain rapeseed oil-based prepolymers; Mixing the rapeseed oil-based prepolymers with thio glycerol and a photoinitiator to perform a thiol-ene click reaction under light to obtain the rapeseed oil-based polyols, wherein the mass ratio of the rapeseed oil-based prepolymers to the thio glycerol is 5-7:1-1.

3.

2. The mar resistant waterborne artistic paint of claim 1, wherein The disulfides have aromatic groups in the molecular structure.

3. The mar resistant waterborne artistic paint of claim 1, wherein The disulfides are bis(2-aminophenyl) disulfide.

4. The mar resistant waterborne artistic paint of claim 1, wherein The isocyanate materials include isophorone diisocyanate and dicyclohexyl methane diisocyanate, and the molar ratio of the isophorone diisocyanate to the dicyclohexyl methane diisocyanate is 1:1.5-2.

5.

5. The mar resistant waterborne artistic paint of claim 1, wherein During the epoxidation reaction, the mass ratio of the rapeseed oil to the hydrogen peroxide is 2-4:1.

7.

6. The mar resistant waterborne artistic paint of claim 1, wherein During the opening ring reaction, the olefinic acid materials are selected from any one of 7-octenoic acid, 8-nonenoic acid, and 9-decenoic acid.

7. The mar resistant waterborne artistic paint of claim 1, wherein During the thiol-ene click reaction, the mass ratio of the rapeseed oil-based prepolymers to the photoinitiator is 1:0.04-0.

06.

8. The mar resistant waterborne artistic paint of claim 7, wherein The reaction temperature of the thiol-ene click reaction is 30-40°C, and the reaction time is 4-6 hours.

9. A method of preparing the scratch resistant waterborne artistic paint according to any one of claims 1 to 8, characterized in that, The method includes the following operations: Measuring the raw materials for preparing the scratch-resistant water-based artistic paint by weight; Prepolymerizing the alcohol materials, the isocyanate materials, and the silicone modifiers at a temperature of 70-80°C to obtain polyurethane prepolymers; Adding the disulfides to the polyurethane prepolymers, keeping the reaction temperature at 55-65°C, and stopping the reaction until the isocyanate value in the reaction system is 0 to obtain the scratch-resistant water-based artistic paint.

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