Flashing paint as well as preparation method and application thereof

Abstract

The invention discloses flashing paint and a preparation method and application thereof, and belongs to the technical field of paints.The flashing paint is prepared from, by weight, 20-40 parts of waterborne epoxy resin, 15-25 parts of waterborne modified polyurethane, 10-14 parts of a coupling agent modified flashing material, 0.4-0.8 part of a wetting agent, 0.3-0.6 part of a defoaming agent, 3-4.5 parts of an amine curing agent, 1-2 parts of a coalescing agent and 25-40 parts of water. Wherein the coupling agent modified flash material is prepared from a flash material and a coupling agent. The prepared flashing paint is environmentally friendly, free of pungent smell, high in glossiness, good in uniformity, good in adhesive force, weather resistance and water resistance and capable of being applied to outdoor tools such as fishing rods, fishing rods, golf clubs and tennis rackets and home furnishing and automobile decoration.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, and particularly relates to a glitter paint, its preparation method and application. Background Technology

[0002] Metallic paint is a type of coating that imparts a metallic luster or pearlescent effect to the film by adding special glittery materials (such as metallic powder and pearlescent powder). It is widely used in automobiles, construction, home decoration, and industrial equipment. Metallic paint utilizes the reflection and refraction of light by these glittery materials to create dynamic color changes in the coating film at different angles, thereby enhancing visual appeal. Compared to traditional coatings, metallic paint not only has unique decorative properties but also features high hardness and scratch resistance, especially suitable for outdoor applications where it meets the requirements for gloss and color. Early metallic paints primarily relied on aluminum or copper powder as pigments, achieving a metallic luster effect through solvent-based systems, but these suffered from poor environmental performance and complex application. With technological advancements, water-based metallic paints have gradually become popular, using water as the dispersion medium to effectively reduce the emission of volatile organic compounds (VOCs).

[0003] Current mainstream glitter paint formulations are typically resin-based, with common film-forming substances including polyurethane, epoxy resin, acrylic resin, polyester resin, and fluorocarbon resin. Epoxy resin is widely used in primers and intermediate coats due to its excellent adhesion and chemical stability, while acrylic resin is often used in topcoats due to its good gloss and weather resistance. For glitter materials, aluminum powder, mica titanium pearl powder, and glass flakes are commonly used raw materials; their particle size and shape affect the glitter effect of the coating. Furthermore, additives such as leveling agents, defoamers, and dispersants can be added to glitter paint formulations to optimize application performance, and viscosity can be adjusted using solvents to suit different application processes. Traditional processes often employ high-shear stirring to uniformly disperse the glitter material in the resin system, followed by application through spraying, brushing, or dipping. In addition, electrostatic spraying is widely used in automotive painting, allowing for control of pigment orientation.

[0004] However, existing water-based glitter paints still suffer from the following technical problems: On the one hand, the dispersion uniformity of glitter materials in water-based systems is insufficient, easily leading to color differences or mottling defects in the coating film; on the other hand, some resin systems are prone to oxidation reactions under high temperatures or ultraviolet radiation, causing yellowing or even chalking of the coating, severely restricting its long-term stability in complex outdoor environments. Furthermore, water-based systems also suffer from insufficient adhesion and poor water resistance, making it difficult to meet the demands of high weather resistance applications. Therefore, there is an urgent need to develop a new type of glitter paint that combines environmental friendliness with excellent overall performance, improving coating adhesion, weather resistance, and water resistance, thereby maintaining the glitter decorative effect while also ensuring broad applicability in industrial applications. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing a glitter paint, which uses a combination of water-based epoxy resin and water-based modified polyurethane resin, and adds coupling agents to modify the glitter material and other components, which significantly improves the overall performance of the glitter paint, such as adhesion, weather resistance (yellowing resistance) and water resistance.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a glitter paint, which, by weight, is composed of the following components: 20-40 parts waterborne epoxy resin, 15-25 parts waterborne modified polyurethane, 10-14 parts coupling agent modified glitter material, 0.4-0.8 parts wetting agent, 0.3-0.6 parts defoamer, 3-4.5 parts amine curing agent, 1-2 parts film-forming aid, and 25-40 parts water.

[0007] Preferably, the preparation method of the waterborne modified polyurethane includes the following steps: Polycarbonate diol, trisilyl isobutyl-POSS, 1H,1H,8H,8H-dodecano-1,8-octanediol, 2,2-dimethylolpropionic acid, and acetone were added to a sealed reactor and heated to remove water under nitrogen protection. Isophorone diisocyanate and a catalyst were added, and the mixture was heated to obtain prepolymer A. Prepolymer A was cooled, and hydroxyethyl acrylate, 2-hydroxyethyl methacrylate phosphate, and 1,4-butanediol were added to react. Triethylamine was then added to continue the reaction to obtain prepolymer B. Water and ethylenediamine were added to prepolymer B for shear emulsification, and acetone was removed by rotary evaporation to obtain waterborne modified polyurethane.

[0008] The waterborne modified polyurethane prepared using the above method can significantly improve the adhesion, weather resistance, and water resistance of the coating. Specifically, polycarbonate diol serves as the main chain backbone; its ester bond hydrolysis resistance and flexible segment structure effectively disperse stress and reduce film brittleness. The cage-like siloxane structure of trisilyl isobutyl-POSS absorbs ultraviolet light through high-density Si-O bonds. Its rigid silicon cage forms an interpenetrating network with the polycarbonate segments, inhibiting photodegradation and cracking. Simultaneously, its surface hydroxyl groups react with the -NCO groups of isophorone diisocyanate to construct chemical crosslinking points, improving weather resistance (resistance to yellowing). The perfluoroalkyl chains of dodecyl fluoro-1,8-octanediol can spontaneously migrate to the coating surface, forming a low-energy barrier and reducing the water molecule penetration rate. Furthermore, its intramolecular hydroxyl groups react with the propylene glycol... The carboxyl groups of the acrylic monomers synergistically participate in the chain extension reaction, enhancing the hydrogen bonding between molecular chains; the phosphate groups of 2-hydroxyethyl methacrylate phosphate ester ionize under acidic conditions and form PO-Me covalent bonds with the substrate surface, while its β-hydroxyethyl group simultaneously participates in the -NCO chain extension reaction, constructing strong adhesion-promoting sites in the resin skeleton, thus improving the interfacial peel strength; the aliphatic ring structure of isophorone diisocyanate inhibits ester bond hydrolysis, and its rigid cyclic structure synergistically reduces the photoactivation energy with the fluorohydrin side chain, resulting in a significantly lower yellowing index compared to conventional polyurethane; the flexible segments of hydroxyethyl acrylate and 1,4-butanediol regulate the internal stress distribution, achieving a balance between rigidity and flexibility.

[0009] Preferably, the weight ratio of the polycarbonate diol, trisilyl isobutyl-POSS, 1H,1H,8H,8H-dodecano-1,8-octanediol, and 2,2-dimethylolpropionic acid is 10-20:1-5:0.5-2:1-2.

[0010] Preferably, the weight ratio of the polycarbonate diol, isophorone diisocyanate, and catalyst is 10-20:10-15:0.01-0.05.

[0011] Preferably, the weight ratio of the polycarbonate diol, hydroxyethyl acrylate, 2-hydroxyethyl methacrylate phosphate, and 1,4-butanediol is 10-20:1-3:0.5-2:1-1.5.

[0012] Preferably, the weight ratio of the polycarbonate diol, triethylamine, water, and ethylenediamine is 10-20:0.5-1:30-50:0.2-0.8.

[0013] Preferably, the preparation method of the waterborne modified polyurethane includes the following steps: By weight, 10-20 parts of polycarbonate diol, 1-5 parts of trisilyl isobutyl-POSS, 0.5-2 parts of 1H,1H,8H,8H-dodecano-1,8-octanediol, 1-2 parts of 2,2-dimethylolpropionic acid, and 10-30 parts of acetone are added to a sealed reactor. Under nitrogen protection, the mixture is heated to 55-60℃ for dehydration for 30-40 minutes. Then, 10-15 parts of isophorone diisocyanate and 0.01-0.05 parts of catalyst are added, and the mixture is heated to 65-70℃ for 2-5 hours to obtain prepolymer A. Prepolymer A is cooled to 50-55℃, and 1-3 parts of hydroxyethyl acrylate, 0.5-2 parts of 2-hydroxyethyl methacrylate phosphate, and 1-1.5 parts of 1,4-butanediol are added and reacted for 1-2 hours. Then, 0.5-1 parts of triethylamine are added and the reaction continues for 20-30 minutes to obtain prepolymer B. Under shear conditions of 1000-3000 r / min, 30-50 parts of water and 0.2-0.8 parts of ethylenediamine are added to prepolymer B and shear emulsified for 30-50 minutes. Acetone is removed by rotary evaporation at 45-50℃ to obtain waterborne modified polyurethane.

[0014] Preferably, the catalyst is at least one of dibutyltin dilaurate, stannous octoate, and cyclohexyldimethylamine.

[0015] Preferably, the coupling agent modified glitter material is prepared by using glitter material and coupling agent in a weight ratio of 10-30:0.2-1.

[0016] Preferably, the coupling agent-modified glitter material is prepared by the following method: By weight, 10-30 parts of glitter material, 0.2-1 parts of silane coupling agent KH-560 and 20-60 parts of 60-80wt% ethanol aqueous solution are mixed, ultrasonically treated for 20-40 minutes at a frequency of 30-50kHz and a power of 100-300W, concentrated and dried to obtain coupling agent modified glitter material.

[0017] Preferably, the coupling agent is at least one of silane coupling agent KH-560, silane coupling agent KH-561, and silane coupling agent KH-78.

[0018] This invention modifies the glitter material by using a specific silane coupling agent, which not only improves the dispersion stability of the glitter material in the aqueous system and reduces agglomeration, but also enhances the stress transfer efficiency between the metal particles and the resin matrix through chemical bonding, thereby improving the adhesion, weather resistance and other properties of the paint film.

[0019] Preferably, the glitter material is at least one of aluminum powder, zinc powder, copper powder, and pearlescent powder.

[0020] Preferably, the aqueous epoxy resin is a nonionic aqueous dispersion of modified bisphenol A type epoxy resin, model Houxian® EP420, with a solid content of 50-55wt% and an epoxy equivalent of 1000-1100g / eq.

[0021] Preferably, the wetting agent is at least one selected from Tego 260, Tego 505, and Tego 510. (Brand: Digo) Preferably, the defoamer is at least one of defoamer BYK-022, defoamer BYK-012, and defoamer BYK-019. (Brand: BYK) Preferably, the amine curing agent is a polyamide curing agent.

[0022] Preferably, the film-forming aid is at least one of dipropylene glycol butyl ether, propylene glycol phenyl ether, and ethylene glycol butyl ether acetate.

[0023] This invention also provides a method for preparing glitter paint, comprising the following steps: Accurately weigh each raw material according to the component formula, add waterborne epoxy resin, waterborne modified polyurethane, coupling agent modified glitter material, film-forming aid, and water into a high-speed mixer and stir for 30-50 minutes. Then add wetting agent, defoamer, and amine curing agent and continue stirring for 20-40 minutes to obtain glitter paint.

[0024] Preferably, the high-speed mixer rotates at a speed of 200-500 r / min.

[0025] This invention also provides an application of glitter paint in the preparation of outdoor products, home furnishings, and automotive decorations.

[0026] The applications of this invention include, but are not limited to, outdoor equipment such as fishing rods, golf clubs, and tennis rackets.

[0027] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows: 1. This invention discloses a glitter paint and its preparation method. By adding waterborne epoxy resin and waterborne modified polyurethane resin in a synergistic effect, not only can the dispersibility of the glitter material in the glitter paint matrix be improved, but the overall performance of the glitter paint, such as adhesion, weather resistance, and water resistance, is also significantly enhanced. The glitter paint prepared by this invention is environmentally friendly, odorless, has high gloss and good uniformity, and can be widely used in outdoor products, home furnishings, automotive decorations, and other fields.

[0028] 2. The waterborne modified polyurethane prepared by this invention can significantly improve the adhesion, weather resistance, and water resistance of glitter paint. Specifically, polycarbonate diol serves as the main chain backbone; its ester bonds' resistance to hydrolysis and flexible segment structure effectively disperse stress and reduce film brittleness. The cage-like siloxane structure of trisilyl isobutyl-POSS absorbs ultraviolet light through high-density Si-O bonds, forming an interpenetrating network with the polycarbonate segments, inhibiting photodegradation and improving weather resistance. The perfluoroalkyl chain of dodecyl-1,8-octanediol can spontaneously migrate to the paint film surface, forming a low-energy barrier and reducing the water molecule penetration rate. The phosphate groups of 2-hydroxyethyl methacrylate phosphate ester ionize under acidic conditions and form covalent bonds with the substrate surface, constructing strong adhesion-promoting sites in the resin backbone, thus improving interfacial peel strength. Detailed Implementation

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] The raw materials used in the embodiments and comparative examples of this invention are all derived from self-made or commercially available sources, but are not limited to the following materials: Waterborne epoxy resin: model Houxian® EP420, solid content 53wt%, epoxy equivalent 1050g / eq, purchased from Guangdong Huaguoshan Environmental Protection Technology Co., Ltd.

[0031] Waterborne polyurethane: model SEAPUR 40G30, solid content 36wt%, purchased from Guangdong Xidun New Material Technology Co., Ltd.

[0032] Polyamide curing agent: model curmide 9115, amine value 200mg KOH / g, solid content >98wt%, purchased from Guangdong Shuntian New Materials Co., Ltd.

[0033] Polycarbonate diol: Model number SYHP2000, average molecular weight 2000, hydroxyl value 50-62 mg KOH / g, purchased from Shanghai Shuyu Chemical Co., Ltd.

[0034] Trisilyl Isobutyl-POSS: CAS No. 307531-92-6, purchased from Xi'an Qiyue Biotechnology Co., Ltd.

[0035] Polytetrahydrofuran ether diol: model PTMEG2000, average molecular weight 2000, purchased from Guangzhou Haoyi New Material Technology Co., Ltd.

[0036] Hydroxyl silicone oil: Model JG-2103, hydroxyl content 6wt%, viscosity 40mm. 2 / s (25℃), purchased from Jiangxi Sibo Chemical Co., Ltd.

[0037] Aluminum powder: model YT-Al-01-3, average particle size 10μm, purchased from Gongyi Yalu Materials Co., Ltd. Example

[0038] This embodiment provides a glitter paint, which, by weight, is composed of the following components: The composition comprises 30 parts waterborne epoxy resin, 20 parts waterborne modified polyurethane, 12 parts coupling agent modified glitter material, 0.6 parts wetting agent, 0.4 parts defoamer, 3.5 parts amine curing agent, 1.5 parts film-forming aid, and 32 parts deionized water. The wetting agent is Tego 260. The defoamer is BYK-022. The amine curing agent is a polyamide curing agent. The film-forming aid is dipropylene glycol butyl ether.

[0039] The coupling agent-modified glitter material is prepared by the following method: By weight, 20 parts of glitter material, 0.6 parts of silane coupling agent KH-560, and 40 parts of 70wt% ethanol aqueous solution were mixed, ultrasonicated for 30 min at a frequency of 35 kHz and a power of 200 W, concentrated, and dried to obtain coupling agent modified glitter material. The glitter material is aluminum powder.

[0040] The preparation method of the waterborne modified polyurethane includes the following steps: By weight, 15 parts of polycarbonate diol, 3 parts of trisilyl isobutyl-POSS, 1 part of 1H,1H,8H,8H-dodecano-1,8-octanediol, 1.5 parts of 2,2-dimethylolpropionic acid and 20 parts of acetone were added to a sealed reactor. The reactor was heated to 60°C for 35 min under nitrogen protection to remove water. Then, 12 parts of isophorone diisocyanate and 0.03 parts of dibutyltin dilaurate were added. The reactor was heated to 65°C and reacted for 3 h to obtain prepolymer A. Prepolymer A was cooled to 50°C, and 2 parts of hydroxyethyl acrylate, 1 part of 2-hydroxyethyl methacrylate phosphate, and 1.2 parts of 1,4-butanediol were added and reacted for 1.5 h. Then, 0.8 parts of triethylamine were added and the reaction continued for 25 min to obtain prepolymer B. Under a shear condition of 1500 r / min, 40 parts of deionized water and 0.5 parts of ethylenediamine were added to prepolymer B and sheared and emulsified for 40 min. Acetone was removed by rotary evaporation at 50°C to obtain waterborne modified polyurethane.

[0041] This embodiment provides a method for preparing glitter paint, including the following steps: Accurately weigh each raw material according to the component formula, add waterborne epoxy resin, waterborne modified polyurethane, coupling agent modified glitter material, film-forming aid, and deionized water into a high-speed mixer, stir at 300 r / min for 35 min, then add wetting agent, defoamer, and amine curing agent and continue stirring for 25 min to obtain glitter paint. Example

[0042] This embodiment provides a glitter paint, which, by weight, is composed of the following components: The composition comprises 20 parts waterborne epoxy resin, 15 parts waterborne modified polyurethane, 10 parts coupling agent modified glitter material, 0.4 parts wetting agent, 0.3 parts defoamer, 3 parts amine curing agent, 1 part film-forming aid, and 25 parts deionized water. The wetting agent is Tego260. The defoamer is BYK-022. The amine curing agent is a polyamide curing agent. The film-forming aid is dipropylene glycol butyl ether.

[0043] The coupling agent-modified glitter material is the same as in Example 1.

[0044] The preparation method of the waterborne modified polyurethane is the same as that in Example 1.

[0045] This embodiment provides a method for preparing glitter paint that is the same as in Embodiment 1. Example

[0046] This embodiment provides a glitter paint, which, by weight, is composed of the following components: The composition comprises 40 parts waterborne epoxy resin, 25 parts waterborne modified polyurethane, 14 parts coupling agent modified glitter material, 0.8 parts wetting agent, 0.6 parts defoamer, 4.5 parts amine curing agent, 2 parts film-forming aid, and 40 parts deionized water. The wetting agent is Tego 260. The defoamer is BYK-022. The amine curing agent is a polyamide curing agent. The film-forming aid is dipropylene glycol butyl ether.

[0047] The coupling agent-modified glitter material is the same as in Example 1.

[0048] The preparation method of the waterborne modified polyurethane is the same as that in Example 1.

[0049] This embodiment provides a method for preparing glitter paint that is the same as in Embodiment 1.

[0050] Comparative Example 1 The difference between this comparative example and Example 1 is that the preparation method of the waterborne modified polyurethane is different, as follows: The preparation method of the waterborne modified polyurethane includes the following steps: By weight, 15 parts of polytetrahydrofuran ether diol, 3 parts of trisilyl isobutyl-POSS, 1 part of 1H,1H,8H,8H-dodecano-1,8-octanediol, 1.5 parts of 2,2-dimethylolpropionic acid and 20 parts of acetone were added to a sealed reactor. The reactor was heated to 60°C for 35 min under nitrogen protection to remove water. Then, 12 parts of isophorone diisocyanate and 0.03 parts of dibutyltin dilaurate were added. The reactor was heated to 65°C and reacted for 3 h to obtain prepolymer A. Prepolymer A was cooled to 50°C, and 2 parts of hydroxyethyl acrylate, 1 part of 2-hydroxyethyl methacrylate phosphate, and 1.2 parts of 1,4-butanediol were added and reacted for 1.5 h. Then, 0.8 parts of triethylamine were added and the reaction continued for 25 min to obtain prepolymer B. Under a shear condition of 1500 r / min, 40 parts of deionized water and 0.5 parts of ethylenediamine were added to prepolymer B and sheared and emulsified for 40 min. Acetone was removed by rotary evaporation at 50°C to obtain waterborne modified polyurethane.

[0051] Comparative Example 2 The difference between this comparative example and Example 1 is that the preparation method of the waterborne modified polyurethane is different, as follows: The preparation method of the waterborne modified polyurethane includes the following steps: By weight, 15 parts of polycarbonate diol, 3 parts of hydroxyl silicone oil, 1 part of 1H,1H,8H,8H-dodecano-1,8-octanediol, 1.5 parts of 2,2-dimethylolpropionic acid and 20 parts of acetone were added to a sealed reactor. The reactor was heated to 60°C for 35 min under nitrogen protection to remove water. Then, 12 parts of isophorone diisocyanate and 0.03 parts of dibutyltin dilaurate were added. The reactor was heated to 65°C and reacted for 3 h to obtain prepolymer A. Prepolymer A was cooled to 50°C, and 2 parts of hydroxyethyl acrylate, 1 part of 2-hydroxyethyl methacrylate phosphate, and 1.2 parts of 1,4-butanediol were added and reacted for 1.5 h. Then, 0.8 parts of triethylamine were added and the reaction continued for 25 min to obtain prepolymer B. Under a shear condition of 1500 r / min, 40 parts of deionized water and 0.5 parts of ethylenediamine were added to prepolymer B and sheared and emulsified for 40 min. Acetone was removed by rotary evaporation at 50°C to obtain waterborne modified polyurethane.

[0052] Comparative Example 3 The difference between this comparative example and Example 1 is that the preparation method of the waterborne modified polyurethane is different, as follows: The preparation method of the waterborne modified polyurethane includes the following steps: By weight, 15 parts of polycarbonate diol, 3 parts of trisilyl isobutyl-POSS, 1 part of 1,4-butanediol, 1.5 parts of 2,2-dimethylolpropionic acid and 20 parts of acetone were added to a sealed reactor. The reactor was heated to 60°C for 35 min under nitrogen protection to remove water. Then, 12 parts of isophorone diisocyanate and 0.03 parts of dibutyltin dilaurate were added. The reactor was heated to 65°C and reacted for 3 h to obtain prepolymer A. Prepolymer A was cooled to 50°C, and 2 parts of hydroxyethyl acrylate, 1 part of 2-hydroxyethyl methacrylate phosphate, and 1.2 parts of 1,4-butanediol were added and reacted for 1.5 h. Then, 0.8 parts of triethylamine were added and the reaction continued for 25 min to obtain prepolymer B. Under a shear condition of 1500 r / min, 40 parts of deionized water and 0.5 parts of ethylenediamine were added to prepolymer B and sheared and emulsified for 40 min. Acetone was removed by rotary evaporation at 50°C to obtain waterborne modified polyurethane.

[0053] Comparative Example 4 The difference between this comparative example and Example 1 is that the preparation method of the waterborne modified polyurethane is different, as follows: The preparation method of the waterborne modified polyurethane includes the following steps: By weight, 15 parts of polycarbonate diol, 3 parts of trisilyl isobutyl-POSS, 1 part of 1H,1H,8H,8H-dodecano-1,8-octanediol, 1.5 parts of 2,2-dimethylolpropionic acid and 20 parts of acetone were added to a sealed reactor. The reactor was heated to 60°C for 35 min under nitrogen protection to remove water. Then, 12 parts of isophorone diisocyanate and 0.03 parts of dibutyltin dilaurate were added. The reactor was heated to 65°C and reacted for 3 h to obtain prepolymer A. Prepolymer A was cooled to 50°C, and 3 parts of hydroxyethyl acrylate and 1.2 parts of 1,4-butanediol were added and reacted for 1.5 h. Then, 0.8 parts of triethylamine were added and the reaction continued for 25 min to obtain prepolymer B. Under shear conditions of 1500 r / min, 40 parts of deionized water and 0.5 parts of ethylenediamine were added to prepolymer B and sheared and emulsified for 40 min. Acetone was removed by rotary evaporation at 50°C to obtain waterborne modified polyurethane.

[0054] Comparative Example 5 The difference between this comparative example and Example 1 is that the waterborne modified polyurethane is replaced with commercially available waterborne polyurethane.

[0055] Comparative Example 6 The difference between this comparative example and Example 1 is that the preparation method of the coupling agent modified flash material is different, as follows: The coupling agent modified flash material is prepared by the following method: By weight, 20 parts of glitter material, 0.6 parts of silane coupling agent KH-570, and 40 parts of 70wt% ethanol aqueous solution were mixed, ultrasonicated for 30 min at a frequency of 35 kHz and a power of 200 W, concentrated, and dried to obtain coupling agent modified glitter material. The glitter material is aluminum powder.

[0056] Performance testing The performance of the glitter paints prepared in Examples 1-3 and Comparative Examples 1-6 was tested. Paint film samples for each example were prepared according to standard GB / T 1727-2021 "General Preparation Method of Paint Films". The adhesion of the paint films was determined according to standard GB / T 9286-2021 "Cross-cut Test of Paints and Varnishes", graded from 0 to 5, with grade 0 being the best and grade 5 the worst. The gloss of the paint films was determined according to standard GB / T 9754-2007 "Determination of 20°, 60° and 85° Specular Gloss of Paint Films without Metallic Pigments", with a test angle of 60°. The weather resistance (artificial aging) of the paint films was determined according to standard GB / T 1865-2009 "Artificial Climate Aging and Artificial Radiation Exposure to Filtered Xenon Arc Radiation of Paints and Varnishes". After 2000 hours of xenon lamp aging, the gloss retention rate was calculated, and changes in the paint film were observed. The water resistance of the above-mentioned paint film was determined according to the standard GB / T 1733-1993 "Test Method for Water Resistance of Paint Film". The above-mentioned lacquer was applied to the surface of the wood block to form a paint film. After the film was formed, the wood block was immersed in water at room temperature for 24 hours. The mass change of the wood block before and after immersion was measured to calculate the water absorption rate. The lower the absorption rate, the better the water resistance. The test results are shown in Table 1.

[0057] Table 1: Performance Test Results of Flash Paint Adhesion / Grade Glossiness Xenon lamp aging paint film appearance Xenon lamp luminous retention rate after aging / % Water absorption rate / % Example 1 0 110 Smooth and free from yellowing 87.9 0.08 Example 2 0 113 Smooth and free from yellowing 88.6 0.06 Example 3 0 108 Smooth and free from yellowing 87.0 0.12 Comparative Example 1 1 106 Smooth and free from yellowing 85.5 3.95 Comparative Example 2 1 105 Noticeable pinking, noticeable yellowing 69.3 1.01 Comparative Example 3 0 103 Smooth and free from yellowing 83.4 5.78 Comparative Example 4 2 102 Smooth and free from yellowing 86.2 0.98 Comparative Example 5 2 97 Noticeable pinking, noticeable yellowing 73.1 6.23 Comparative Example 6 1 95 Slight pinking, slight yellowing 81.7 0.65 As can be seen from the test results in Table 1 above, the glitter paints prepared in Examples 1-3 not only have high adhesion and high gloss, but also good weather resistance and water resistance. In particular, the glitter paint described in Example 2 exhibits the most outstanding comprehensive performance. This is because the present invention combines a specific water-based modified polyurethane with a water-based epoxy resin and uses a coupling agent to modify the glitter material, thereby resulting in a glitter paint film that simultaneously possesses good adhesion, gloss, weather resistance, and water resistance. In contrast, Comparative Examples 1-5 did not use the specific method to prepare the water-based modified polyurethane, and Comparative Example 6 did not use a specific silane coupling agent to modify the glitter material, resulting in their corresponding glitter paints having worse adhesion, gloss, weather resistance, and water resistance than Examples 1-3. The test data further demonstrates that the technical solution protected in this invention is crucial for achieving beneficial technical effects.

[0058] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A glitter paint, characterized in that, By weight, it includes the following components: 20-40 parts waterborne epoxy resin, 15-25 parts waterborne modified polyurethane, 10-14 parts coupling agent modified glitter material, 0.4-0.8 parts wetting agent, 0.3-0.6 parts defoamer, 3-4.5 parts amine curing agent, 1-2 parts film-forming aid, and 25-40 parts water.

2. The glitter paint according to claim 1, characterized in that, The coupling agent modified glitter material is prepared by using glitter material and coupling agent in a weight ratio of 10-30:0.2-1.

3. The glitter paint according to claim 2, characterized in that, The coupling agent is at least one of silane coupling agent KH-560, silane coupling agent KH-561, and silane coupling agent KH-78; the glitter material is at least one of aluminum powder, zinc powder, copper powder, and pearlescent powder.

4. The glitter paint according to claim 1, characterized in that, The preparation method of the waterborne modified polyurethane includes the following steps: Polycarbonate diol, trisilyl isobutyl-POSS, 1H,1H,8H,8H-dodecano-1,8-octanediol, 2,2-dimethylolpropionic acid, and acetone were added to a sealed reactor and heated to remove water under nitrogen protection. Isophorone diisocyanate and a catalyst were added, and the mixture was heated to obtain prepolymer A. Prepolymer A was cooled, and hydroxyethyl acrylate, 2-hydroxyethyl methacrylate phosphate, and 1,4-butanediol were added to react. Triethylamine was then added to continue the reaction to obtain prepolymer B. Water and ethylenediamine were added to prepolymer B for shear emulsification, and acetone was removed by rotary evaporation to obtain waterborne modified polyurethane.

5. The glitter paint according to claim 4, characterized in that, The weight ratio of polycarbonate diol, trisilyl isobutyl-POSS, 1H,1H,8H,8H-dodecano-1,8-octanediol, and 2,2-dimethylolpropionic acid is 10-20:1-5:0.5-2:1-2; the weight ratio of polycarbonate diol, isophorone diisocyanate, and catalyst is 10-20:10-15:0.01-0.05; the weight ratio of polycarbonate diol, hydroxyethyl acrylate, 2-hydroxyethyl methacrylate phosphate, and 1,4-butanediol is 10-20:1-3:0.5-2:1-1.5; and the weight ratio of polycarbonate diol, triethylamine, water, and ethylenediamine is 10-20:0.5-1:30-50:0.2-0.

8.

6. The glitter paint according to claim 4, characterized in that, The catalyst is at least one of dibutyltin dilaurate, stannous octoate, and cyclohexyldimethylamine.

7. The glitter paint according to claim 1, characterized in that, The wetting agent is at least one of the wetting agents Tego 260, Tego 505, and Tego 510; the defoamer is at least one of the defoamers BYK-022, BYK-012, and BYK-019.

8. The glitter paint according to claim 1, characterized in that, The amine curing agent is a polyamide curing agent; the film-forming aid is at least one of dipropylene glycol butyl ether, propylene glycol phenyl ether, and ethylene glycol butyl ether acetate.

9. The method for preparing glitter paint according to any one of claims 1-8, characterized in that, Includes the following steps: Accurately weigh each raw material according to the component formula, add waterborne epoxy resin, waterborne modified polyurethane, coupling agent modified glitter material, film-forming aid, and water into a high-speed mixer and stir for 30-50 minutes. Then add wetting agent, defoamer, and amine curing agent and continue stirring for 20-40 minutes to obtain glitter paint.

10. The use of the glitter paint according to any one of claims 1-8 in the preparation of outdoor products, home furnishings, and automotive decorations.