High-weather-resistant three-color paint and preparation method thereof

Abstract

This invention provides a high weather-resistant three-color paint and its preparation method. The high weather-resistant three-color paint includes a white primer, a red primer, a blue primer, a topcoat, a clear coat, and a curing agent. Modified silica is added to the white primer, red primer, blue primer, topcoat, and clear coat. The modified silica is obtained by copolymerizing hydroxyl hyperbranched polymer-coated nano-silica, 2,4-dihydroxybenzophenone-grafted cyanuric chloride, and hydroxyl acrylate. This modified silica possesses a three-dimensional cross-linked network structure, which directly enhances the mechanical properties of the paint film. It also incorporates abundant ultraviolet absorbing groups, significantly improving the weather resistance of the paint film. Simultaneously, the large number of active hydroxyl groups it contains enhances the adhesion of the paint film. During the curing process, the isocyanate groups of the curing agent combine with the hydroxyl-containing components in the system to form a highly integrated and dense paint film structure, further improving the mechanical properties, weather resistance, and optimizing acid and alkali resistance of the paint film.

Description

Technical Field

[0001] This invention relates to the field of three-color paint preparation, specifically to a high weather-resistant three-color paint and its preparation method. Background Technology

[0002] In the coatings industry, tricolor paint, as a type of coating that combines decorative and functional properties, is widely used in various scenarios such as building exteriors, outdoor facilities, and the shells of transportation vehicles. Its core feature lies in the synergistic combination of multiple layers of primer (usually containing different base colors) with topcoat and clear coat to form a coating with rich color layers and visual effects. This not only meets the aesthetic needs of different scenarios but also provides a certain degree of protection for the substrate, resisting direct erosion from the external environment and extending the service life of the substrate.

[0003] Three-color paint typically consists of multiple primers (such as white, red, and blue base coats), topcoat, clear coat, and a matching curing agent. The primer is usually prepared using resin (such as common acrylic resin or alkyd resin) as the film-forming base, combined with appropriate pigments (such as titanium dioxide or organic coloring pigments), a small amount of additives (such as simple leveling agents and defoamers), and organic solvents, through a simple mixing and dispersion process. The topcoat may contain pearlescent powder or other substances to enhance the appearance and texture. The clear coat mainly consists of resin and solvent, used to enhance the coating's gloss and abrasion resistance. The curing agent is usually a conventional isocyanate, which reacts with the active groups in the resin to achieve coating curing.

[0004] However, existing three-color paints have several undeniable drawbacks. Firstly, their weather resistance is poor. Long-term exposure to outdoor environments and UV radiation can cause the coating to crack, discolor, and chalk, making it unable to maintain a stable appearance and performance over extended periods. Secondly, the coating's adhesion is insufficient, making it prone to peeling and delamination under environmental factors such as temperature changes and humidity fluctuations, affecting its protective effect on the substrate. Furthermore, the coating's structure lacks density, making it vulnerable to corrosive media such as acids and alkalis, easily eroded and exhibiting abnormal appearances. Its mechanical properties also need improvement; insufficient hardness makes it prone to scratches from minor impacts or friction, failing to meet the long-term usage requirements of demanding outdoor applications.

[0005] In conclusion, a new technical solution is urgently needed to address the problems existing in the current technology. Summary of the Invention

[0006] Based on this, the present invention provides a high weather-resistant three-color paint and its preparation method. The high weather-resistant three-color paint includes a white primer, a red primer, a blue primer, a topcoat, a clear coat, and a curing agent. Modified silica is added to the white primer, red primer, blue primer, topcoat, and clear coat. The modified silica is obtained by copolymerizing hydroxyl hyperbranched polymer-coated nano-silica, 2,4-dihydroxybenzophenone-grafted cyanuric chloride, and hydroxyl acrylate. This modified silica possesses a three-dimensional cross-linked network structure, which directly enhances the mechanical properties of the paint film. It also incorporates abundant ultraviolet absorbing groups, significantly improving the weather resistance of the paint film. Simultaneously, the large number of active hydroxyl groups it contains enhances the adhesion of the paint film. During the curing process, the isocyanate groups of the curing agent combine with the hydroxyl-containing components in the system to form a highly integrated and dense paint film structure, further improving the mechanical properties, weather resistance, and optimizing acid and alkali resistance of the paint film.

[0007] One object of the present invention is to provide a high weather-resistant three-color paint, the high weather-resistant three-color paint comprising a white primer, a red primer, a blue primer, a topcoat, a clear coat, and a curing agent; The white primer comprises the following components in parts by weight: 30-50 parts of hydroxyl acrylic resin 3-8 parts of modified silica 10-20 parts of cellulose acetate butyrate 10-30 parts of titanium dioxide 1-8 parts of auxiliary agent 30-60 parts organic solvent; The red primer comprises the following components in parts by weight: 30-50 parts of hydroxyl acrylic resin 3-8 parts of modified silica 10-20 parts of cellulose acetate butyrate 10-30 parts of titanium dioxide Red pigment 0.01-0.5 parts 1-8 parts of auxiliary agent 30-60 parts organic solvent; The blue primer comprises the following components in parts by weight: 30-50 parts of hydroxyl acrylic resin 3-8 parts of modified silica 10-20 parts of cellulose acetate butyrate 10-30 parts of titanium dioxide Blue pigment 0.01-0.5 parts 1-8 parts of auxiliary agent 30-60 parts organic solvent; The topcoat comprises the following components in parts by weight: 30-50 parts of hydroxyl acrylic resin 3-8 parts of modified silica 10-20 parts of cellulose acetate butyrate Pearl powder 1-5 parts 1-8 parts of auxiliary agent 30-60 parts organic solvent; The varnish comprises the following components in parts by weight: 60-80 parts of hydroxyl acrylic resin 3-8 parts of modified silica 1-8 parts of auxiliary agent 30-60 parts organic solvent; The modified silica is obtained by copolymerizing nano-silica coated with hydroxyl hyperbranched polymer, cyanuric chloride grafted with 2,4-dihydroxybenzophenone, and hydroxy acrylate. The curing agent is a polyisocyanate curing agent.

[0008] Furthermore, during use, the white primer, red primer, blue primer, topcoat, and clear coat are mixed evenly with the hardener; the mass ratio of white primer to hardener, red primer to hardener, blue primer to hardener, and topcoat to hardener is (10-20):1; the mass ratio of clear coat to hardener is (3-8):1.

[0009] Furthermore, the additive is selected from one or more of leveling agents, dispersants, defoamers, antioxidants, and antisettling agents.

[0010] Furthermore, the organic solvent is selected from one or more of butyl acetate, propylene glycol methyl ether acetate, diesters, and aromatic solvents.

[0011] Another object of the present invention is to provide a method for preparing the high weather-resistant three-color paint, comprising the following steps: S1. Amino-modified nano-silica is blended with organic acid anhydride and polyol, and heated to react, to obtain intermediate product 1. S2. The intermediate product 1 is blended with glycidyl methacrylate, a catalyst and a polymerization inhibitor are added, and the mixture is heated to react and obtain intermediate product 2. S3. Sodium bicarbonate and 3-buten-1-ol are added to water and stirred and dispersed under low temperature conditions. Then, cyanuric chloride is added and the mixture is heated to react, yielding intermediate product 3. Intermediate product 3 is added to acetone and stirred and dispersed under low temperature conditions. Then, 2,4-dihydroxybenzophenone is added, the pH is adjusted, and the mixture is stirred to react, yielding intermediate product 4. S4. Blend the intermediate product 2, intermediate product 4, and hydroxy acrylate, add an initiator, and heat to react to obtain modified silica. S5. Mix the white primer, red primer, blue primer, topcoat and clear varnish evenly to obtain a high weather-resistant three-color paint.

[0012] Further, in step S1, the mass ratio of the amino-modified nano silica, organic acid anhydride, and polyol is 1:(1-5):(1-5).

[0013] Furthermore, in step S1, the heating temperature is 110-130℃.

[0014] Further, in step S2, the mass ratio of intermediate product 1 to glycidyl methacrylate is 1:(0.1-0.9).

[0015] Further, in step S3, the mass ratio of 3-buten-1-ol to cyanuric chloride is 1:(2-5); the mass ratio of intermediate product 3 to 2,4-dihydroxybenzophenone is 1:(1-3).

[0016] Furthermore, in step S3, the low temperature condition is 0-5℃.

[0017] Furthermore, in step S3, the pH is 5-6.

[0018] Further, in step S4, the mass ratio of intermediate product 2, intermediate product 4, and hydroxyacrylate is 2:(0.1-0.5):(0.5-1.5).

[0019] Furthermore, in step S4, the heating temperature is 60-80°C.

[0020] Furthermore, the method of using the high weather-resistant three-color paint includes the following steps: first, the substrate is treated, then a white primer with added curing agent is sprayed, and after leveling and surface drying, a red primer and a blue primer with added curing agent are sprayed respectively, and after leveling and surface drying, a topcoat with added curing agent is sprayed, and after leveling and surface drying, it is baked at 70±5℃ for 40 min; finally, a clear varnish with added curing agent is sprayed, and after leveling and surface drying, it is baked at 70±5℃ for 50 min.

[0021] The present invention has the following beneficial effects: This invention provides a high weather-resistant three-color paint and its preparation method. The high weather-resistant three-color paint includes a white primer, a red primer, a blue primer, a topcoat, a clear coat, and a curing agent; wherein modified silica is added to the white primer, red primer, blue primer, topcoat, and clear coat. This invention first reacts amino-modified nano-silica with organic acid anhydrides and polyols to construct nano-silica coated with a hydroxyl hyperbranched polymer. Subsequently, unsaturated double bonds are introduced onto the surface of the nano-silica through the reaction of hydroxyl groups with epoxy groups, while retaining some hydroxyl groups. Simultaneously, unsaturated double bonds are introduced by reacting cyanuric chloride with 3-buten-1-ol, followed by grafting with 2,4-dihydroxybenzophenone to form a UV absorber containing double bonds. Finally, modified silica is obtained through a copolymerization reaction of the double-bonded silica, the double-bonded UV absorber, and hydroxyl acrylate.

[0022] This modified silica possesses a three-dimensional cross-linked network structure, which not only directly enhances the mechanical properties of the paint film, but also incorporates abundant UV-absorbing groups within its network. This provides long-term resistance to UV erosion, reducing problems such as cracking, discoloration, and chalking caused by sunlight, and significantly improving weather resistance. Simultaneously, its abundant active hydroxyl groups synergistically enhance the adhesion of the paint film with components such as hydroxyl acrylic resin and cellulose acetate butyrate in the system. During the curing process, the modified silica also combines with the hydroxyl-containing components in the system through the isocyanate groups of the curing agent, forming a highly integrated and dense paint film structure. This dense structure not only further improves the mechanical and weather resistance of the paint film but also blocks the penetration of corrosive media such as acids and alkalis, optimizing acid and alkali resistance. Through these effects, this invention solves the problems of poor weather resistance, insufficient adhesion, and susceptibility to corrosion found in traditional three-color paints, demonstrating promising application prospects. Detailed Implementation

[0023] To more clearly illustrate the technical solution of the present invention, the following embodiments are provided. Unless otherwise stated, the raw materials, reactions, and post-processing methods appearing in the embodiments are all commercially available raw materials and technical methods well known to those skilled in the art.

[0024] The terms "preferred," "more preferably," and "more suitable" used in this invention refer to embodiments of the invention that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this invention.

[0025] It should be understood that, except in any operational instance or otherwise indicated, the amounts or all figures representing ingredients used, for example, in the specification and claims, should be understood to be modified by the term "about" in all cases. Therefore, unless otherwise stated, the numerical parameters set forth in the following specification and appended claims are approximate values ​​varying according to the desired performance to be obtained according to the invention.

[0026] The present invention uses the following raw materials: Hydroxyacrylate resin: brand name Desmophen 670BA, hydroxyl content 3.5±0.3%, purchased from Covestro.

[0027] Cellulose acetate butyrate: brand name CAB-381-20, purchased from Eastman.

[0028] Leveling agent: BYK-358N.

[0029] Dispersant: BYK-161.

[0030] Defoamer: BYK-066N.

[0031] Anti-settling agent: bentonite.

[0032] Antioxidant: Antioxidant 1010.

[0033] Diester (DBE): Purchased from Condis Chemical (Hubei) Co., Ltd.

[0034] Red pigment: Transparent Red EG, purchased from Kunshan Organic Chemical Plant Co., Ltd.

[0035] Blue pigment: Phthalocyanine Blue, purchased from Wuhan Penglei Biotechnology Co., Ltd.

[0036] Pearlescent powder: purchased from Jiangyin Qibang Pearlescent Materials Co., Ltd.

[0037] Aromatic solvents: xylene.

[0038] Curing agent: Bayer curing agent N3390.

[0039] The preparation method of amino-modified nano-silica includes the following steps: Nano-silica was mixed with hydrogen peroxide (30 wt%), stirred evenly, and heated under reflux for 4 h. Acetone and silane coupling agent KH550 were added (the mass ratio of nano-silica, hydrogen peroxide, acetone and silane coupling agent KH550 was 1:6:40:2.5). The mixture was reacted at 80 °C for 4 h, filtered and dried to obtain amino-modified nano-silica.

[0040] All water used in this invention is deionized water.

[0041] In this invention, "parts" refers to parts by mass. Example 1

[0042] A high weather-resistant three-color paint, comprising a white primer, a red primer, a blue primer, a topcoat, a clear varnish, and a curing agent; The white primer comprises the following components in parts by weight: 40 parts of hydroxyl acrylic resin 6 parts modified silica 15 parts of cellulose acetate butyrate 15 parts titanium dioxide 1 part leveling agent 1 part dispersant 20 parts of butyl acetate 20 parts of propylene glycol methyl ether acetate 10 parts of diester; The red primer comprises the following components in parts by weight: 40 parts of hydroxyl acrylic resin 6 parts of modified silica 15 parts of cellulose acetate butyrate 15 parts titanium dioxide 0.1 part red pigment 1 part leveling agent 1 part dispersant 20 parts of butyl acetate 20 parts of propylene glycol methyl ether acetate 10 parts of diester; The blue primer comprises the following components in parts by weight: 40 parts of hydroxyl acrylic resin 6 parts of modified silica 15 parts of cellulose acetate butyrate 15 parts titanium dioxide 0.1 part blue pigment 1 part leveling agent 1 part dispersant 20 parts of butyl acetate 20 parts of propylene glycol methyl ether acetate 10 parts of diester; The topcoat comprises the following components in parts by weight: 40 parts of hydroxyl acrylic resin 6 parts of modified silica 15 parts of cellulose acetate butyrate 3 parts pearl powder 1 part leveling agent 1 part defoamer 5 parts anti-settling agent 20 parts of butyl acetate 20 parts of propylene glycol methyl ether acetate 10 parts of diester; The varnish comprises the following components in parts by weight: 70 parts of hydroxyl acrylic resin 6 parts of modified silica 1 part leveling agent 1 part defoamer 2 parts antioxidant 20 parts of butyl acetate 20 parts of propylene glycol methyl ether acetate 10 parts of aromatic solvent; When using the product, the white primer, red primer, blue primer, topcoat, and clear coat are mixed evenly with the hardener. The mass ratio of white primer to hardener, red primer to hardener, blue primer to hardener, and topcoat to hardener is 15:1. The mass ratio of clear coat to hardener is 4:1.

[0043] The preparation method of the high weather-resistant three-color paint includes the following steps: S1. Using N,N-dimethylformamide as solvent, amino-modified nano-silica was added and stirred to disperse. Then, phthalic anhydride and pentaerythritol were added (the mass ratio of amino-modified nano-silica, phthalic anhydride and pentaerythritol was 1:1.5:1.4). The mixture was reacted at 120℃ for 5 h, washed and dried to obtain intermediate product 1. S2. Using N,N-dimethylformamide as a solvent, add intermediate product 1 and stir to disperse. Then add glycidyl methacrylate, potassium carbonate catalyst, and hydroquinone polymerization inhibitor (the mass ratio of intermediate product 1, glycidyl methacrylate, potassium carbonate, and hydroquinone is 1:0.5:0.001:0.01). Heat under reflux for 8 h, cool, wash, and dry to obtain intermediate product 2. S3. Using water as a solvent, sodium bicarbonate and 3-buten-1-ol were added and dispersed by stirring at 5°C. Then, cyanuric chloride (sodium bicarbonate, 3-buten-1-ol, and cyanuric chloride in a mass ratio of 1:0.7:1.7) was added, and the mixture was heated to 35°C and reacted for 26 h. The mixture was then filtered, washed, and dried to obtain intermediate product 3. Using acetone as a solvent, intermediate product 3 was added and dispersed by stirring at 5°C. Then, 2,4-dihydroxybenzophenone (intermediate product 3 and 2,4-dihydroxybenzophenone in a mass ratio of 1:1.8) was added. The pH was adjusted to 6 with a sodium hydroxide aqueous solution (10 wt%), and the mixture was stirred and reacted for 16 h. The mixture was then filtered, washed, and dried to obtain intermediate product 4. S4. Using toluene as a solvent, intermediate product 2, intermediate product 4, and hydroxyethyl acrylate (the mass ratio of intermediate product 2, intermediate product 4, and hydroxyethyl acrylate is 2:0.3:1) are mixed, and benzoyl peroxide (1 wt% of reactant) is added as an initiator. The mixture is reacted at 80°C for 10 h, filtered, washed, and dried to obtain modified silica. S5. Mix the white primer, red primer, blue primer, topcoat and clear varnish evenly according to the above mass proportions to obtain a high weather-resistant three-color paint. Example 2

[0044] A high weather-resistant three-color paint, comprising a white primer, a red primer, a blue primer, a topcoat, a clear varnish, and a curing agent; The white primer comprises the following components in parts by weight: 30 parts of hydroxyl acrylic resin 4 parts of modified silica 10 parts of cellulose acetate butyrate 10 parts titanium dioxide 1 part leveling agent 1 part dispersant 15 parts of butyl acetate 15 parts of propylene glycol methyl ether acetate 7 parts of diester; The red primer comprises the following components in parts by weight: 30 parts of hydroxyl acrylic resin 4 parts of modified silica 10 parts of cellulose acetate butyrate 10 parts titanium dioxide 0.1 part red pigment 1 part leveling agent 1 part dispersant 15 parts of butyl acetate 15 parts of propylene glycol methyl ether acetate 7 parts of diester; The blue primer comprises the following components in parts by weight: 30 parts of hydroxyl acrylic resin 4 parts of modified silica 10 parts of cellulose acetate butyrate 10 parts titanium dioxide 0.1 part blue pigment 1 part leveling agent 1 part dispersant 15 parts of butyl acetate 15 parts of propylene glycol methyl ether acetate 7 parts of diester; The topcoat comprises the following components in parts by weight: 30 parts of hydroxyl acrylic resin 4 parts of modified silica 10 parts of cellulose acetate butyrate 3 parts pearl powder 1 part leveling agent 1 part defoamer 5 parts anti-settling agent 15 parts of butyl acetate 15 parts of propylene glycol methyl ether acetate 7 parts of diester; The varnish comprises the following components in parts by weight: 60 parts of hydroxyl acrylic resin 4 parts of modified silica 1 part leveling agent 1 part defoamer 2 parts antioxidant 15 parts of butyl acetate 15 parts of propylene glycol methyl ether acetate 7 parts of aromatic solvents; When using the product, the white primer, red primer, blue primer, topcoat, and clear coat are mixed evenly with the hardener. The mass ratio of white primer to hardener, red primer to hardener, blue primer to hardener, and topcoat to hardener is 15:1. The mass ratio of clear coat to hardener is 4:1.

[0045] The preparation method of the high weather-resistant three-color paint is the same as in Example 1. Example 3

[0046] A high weather-resistant three-color paint, comprising a white primer, a red primer, a blue primer, a topcoat, a clear varnish, and a curing agent; The white primer comprises the following components in parts by weight: 50 parts of hydroxyl acrylic resin 8 parts of modified silica 20 parts of cellulose acetate butyrate 25 parts titanium dioxide 1 part leveling agent 1 part dispersant 25 parts of butyl acetate 25 parts of propylene glycol methyl ether acetate 10 parts of diester; The red primer comprises the following components in parts by weight: 50 parts of hydroxyl acrylic resin 8 parts of modified silica 20 parts of cellulose acetate butyrate 25 parts titanium dioxide 0.1 part red pigment 1 part leveling agent 1 part dispersant 25 parts of butyl acetate 25 parts of propylene glycol methyl ether acetate 10 parts of diester; The blue primer comprises the following components in parts by weight: 50 parts of hydroxyl acrylic resin 8 parts of modified silica 20 parts of cellulose acetate butyrate 25 parts titanium dioxide 0.1 part blue pigment 1 part leveling agent 1 part dispersant 25 parts of butyl acetate 25 parts of propylene glycol methyl ether acetate 10 parts of diester; The topcoat comprises the following components in parts by weight: 50 parts of hydroxyl acrylic resin 8 parts of modified silica 20 parts of cellulose acetate butyrate 3 parts pearl powder 1 part leveling agent 1 part defoamer 5 parts anti-settling agent 25 parts of butyl acetate 25 parts of propylene glycol methyl ether acetate 10 parts of diester; The varnish comprises the following components in parts by weight: 80 parts of hydroxyl acrylic resin 8 parts of modified silica 1 part leveling agent 1 part defoamer 2 parts antioxidant 25 parts of butyl acetate 25 parts of propylene glycol methyl ether acetate 10 parts of aromatic solvent; When using the product, the white primer, red primer, blue primer, topcoat, and clear coat are mixed evenly with the hardener. The mass ratio of white primer to hardener, red primer to hardener, blue primer to hardener, and topcoat to hardener is 15:1. The mass ratio of clear coat to hardener is 4:1.

[0047] The preparation method of the high weather-resistant three-color paint is the same as in Example 1.

[0048] Comparative Example 1 A high weather-resistant three-color paint. The difference between this comparative example and Example 1 is that step S1 is omitted, and step S2 is changed to: amino-modified nano silica, glycidyl methacrylate and polymerization inhibitor hydroquinone are mixed in a mass ratio of 1:10:0.1, reacted at 50°C for 6 h, cooled, washed and dried to obtain intermediate product 2; other steps and dosages are the same as in Example 1.

[0049] Comparative Example 2 A high weather-resistant three-color paint. The difference between this comparative example and Example 1 is that step S3 is omitted. In step S4, the intermediate product 4 is replaced with 2,4-dihydroxybenzophenone by an equal mass. Other steps and dosages are the same as in Example 1.

[0050] Test case The performance of the high weather-resistant three-color paints in Examples 1-3 and Comparative Examples 1-2 was tested.

[0051] Test Method: White primer, red primer, blue primer, topcoat, and clear varnish were mixed evenly with the hardener. The mass ratio of white primer to hardener, red primer to hardener, blue primer to hardener, and topcoat to hardener was 15:1; the mass ratio of clear varnish to hardener was 4:1. The substrate was first treated, then the white primer with added hardener was sprayed on. After leveling and surface drying, the red primer and blue primer with added hardener were sprayed on separately, ensuring no overlap. After leveling and surface drying, the topcoat with added hardener was sprayed on, and after leveling and surface drying, it was baked at 70±5℃ for 40 min. Finally, the clear varnish with added hardener was sprayed on, and after leveling and surface drying, it was baked at 70℃ for 50 min to obtain a high weather-resistant three-color paint film with a total thickness of 40 μm. The performance of the obtained high weather-resistant three-color paint film was then tested.

[0052] Hardness: Refer to GB / T 6739-2006.

[0053] Adhesion: Refer to GB / T 9286-1998.

[0054] Weather resistance: Refer to GB / T 1865-2009; after 2000 hours of artificial aging test, the coating does not bubble, peel, or chalk; there are no defects such as cracking, crazing, or delamination.

[0055] Acid and alkali resistance: Immerse the coating in 0.1 M NaOH at 55℃ for 24 h; immerse it in 0.05 M H2SO4 at 20℃ for 24 h and observe for any abnormalities in the coating appearance.

[0056] The test results are shown in Table 1.

[0057] Table 1 Performance test results of high weather-resistant three-color paint

[0058] As can be seen from the above test results, the high weather-resistant three-color paint of the present invention has the characteristics of high hardness, high adhesion, good weather resistance, and good acid and alkali resistance. However, the modified silica of the high weather-resistant three-color paint in the comparative example is only partially modified, and its component compatibility and bonding tightness are not as good as those of the present invention. Therefore, the performance of each example is reduced to varying degrees compared with the embodiment.

[0059] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0060] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high weather-resistant three-color paint, characterized in that, The high weather-resistant three-color paint includes a white primer, a red primer, a blue primer, a topcoat, a clear varnish, and a curing agent; The white primer comprises the following components in parts by weight: 30-50 parts of hydroxyl acrylic resin 3-8 parts of modified silica 10-20 parts of cellulose acetate butyrate 10-30 parts of titanium dioxide 1-8 parts of auxiliary agent 30-60 parts organic solvent; The red primer comprises the following components in parts by weight: 30-50 parts of hydroxyl acrylic resin 3-8 parts of modified silica 10-20 parts of cellulose acetate butyrate 10-30 parts of titanium dioxide Red pigment 0.01-0.5 parts 1-8 parts of auxiliary agent 30-60 parts organic solvent; The blue primer comprises the following components in parts by weight: 30-50 parts of hydroxyl acrylic resin 3-8 parts of modified silica 10-20 parts of cellulose acetate butyrate 10-30 parts of titanium dioxide Blue pigment 0.01-0.5 parts 1-8 parts of auxiliary agent 30-60 parts organic solvent; The topcoat comprises the following components in parts by weight: 30-50 parts of hydroxyl acrylic resin 3-8 parts of modified silica 10-20 parts of cellulose acetate butyrate Pearl powder 1-5 parts 1-8 parts of auxiliary agent 30-60 parts organic solvent; The varnish comprises the following components in parts by weight: 60-80 parts of hydroxyl acrylic resin 3-8 parts of modified silica 1-8 parts of auxiliary agent 30-60 parts organic solvent; The modified silica is obtained by copolymerizing nano-silica coated with hydroxyl hyperbranched polymer, cyanuric chloride grafted with 2,4-dihydroxybenzophenone, and hydroxy acrylate. The curing agent is a polyisocyanate curing agent.

2. The high weather-resistant three-color paint according to claim 1, characterized in that, When using, mix the white primer, red primer, blue primer, topcoat and clear coat evenly with the hardener; the mass ratio of white primer to hardener, red primer to hardener, blue primer to hardener and topcoat to hardener is (10-20):1; the mass ratio of clear coat to hardener is (3-8):

1.

3. The high weather-resistant three-color paint according to claim 1, characterized in that, The organic solvent is selected from one or more of butyl acetate, propylene glycol methyl ether acetate, diesters, and aromatic solvents.

4. The method for preparing the high weather-resistant three-color paint according to any one of claims 1-3, characterized in that, Includes the following steps: S1. Amino-modified nano-silica is blended with organic acid anhydride and polyol, and heated to react, to obtain intermediate product 1. S2. The intermediate product 1 is blended with glycidyl methacrylate, a catalyst and a polymerization inhibitor are added, and the mixture is heated to react and obtain intermediate product 2. S3. Sodium bicarbonate and 3-buten-1-ol are added to water and stirred and dispersed under low temperature conditions. Then, cyanuric chloride is added and the mixture is heated to react, yielding intermediate product 3. Intermediate product 3 is added to acetone and stirred and dispersed under low temperature conditions. Then, 2,4-dihydroxybenzophenone is added, the pH is adjusted, and the mixture is stirred to react, yielding intermediate product 4. S4. Blend the intermediate product 2, intermediate product 4, and hydroxy acrylate, add an initiator, and heat to react to obtain modified silica. S5. Mix the white primer, red primer, blue primer, topcoat and clear varnish evenly to obtain a high weather-resistant three-color paint.

5. The method for preparing the high weather-resistant three-color paint according to claim 4, characterized in that, In step S1, the mass ratio of the amino-modified nano silica, organic acid anhydride, and polyol is 1:(1-5):(1-5).

6. The method for preparing the high weather-resistant three-color paint according to claim 4, characterized in that, In step S1, the heating temperature is 110-130℃.

7. The method for preparing the high weather-resistant three-color paint according to claim 4, characterized in that, In step S2, the mass ratio of intermediate product 1 to glycidyl methacrylate is 1:(0.1-0.9).

8. The method for preparing the high weather-resistant three-color paint according to claim 4, characterized in that, In step S3, the mass ratio of 3-buten-1-ol to cyanuric chloride is 1:(2-5); the mass ratio of intermediate product 3 to 2,4-dihydroxybenzophenone is 1:(1-3).

9. The method for preparing the high weather-resistant three-color paint according to claim 4, characterized in that, In step S4, the mass ratio of intermediate product 2, intermediate product 4, and hydroxyacrylate is 2:(0.1-0.5):(0.5-1.5).

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