High-performance waterproof coating with wear-resistant self-repairing function and preparation method thereof

Abstract

The invention relates to the technical field of high-performance waterproof coatings, in particular to a high-performance waterproof coating with a wear-resistant self-repairing function and a preparation method of the high-performance waterproof coating. The water-resistant elastic adhesive is prepared from the following raw materials in percentage by weight: 30-40% of water-resistant elastic resin; 8-15% of a modifier; 1-5% of an auxiliary agent; the balance is a solvent; the modifier is composed of wax powder, hyperbranched acrylate oligomer, bis (2-methoxy-4-propylphenol)-terminated polydimethylsiloxane and ureido pyrimidone modified filler according to the weight ratio of 1: (1-3): (0.5-1.5): (2-3), and the components in the scheme form precise synergy, so that the coating has excellent waterproofness, high wear resistance, efficient self-repairing ability and stable adhesion, and is suitable for large-scale popularization and application. When the paint is applied to the automotive interior trim parts, the phenomena of paint film falling, hydrolysis, abrasion, scratching and the like can be effectively reduced, the service life of the interior trim parts is prolonged, and the use requirements of high-end automotive interior trim parts are met.

Description

Technical Field

[0001] This application relates to the technical field of high-performance waterproof coatings, and more specifically, to a high-performance waterproof coating with wear-resistant and self-healing functions and its preparation method. Background Technology

[0002] Coatings are widely used in industrial production and daily life, playing a crucial role, especially in the automotive manufacturing sector. Coatings for automotive interior parts must possess the dual functions of protection and decoration, resisting environmental damage during use while maintaining the aesthetics and tactile experience of the interior. With the continuous development of the automotive industry, the performance requirements for coatings in high-end automotive interior parts are also increasing. Automotive interior parts are constantly exposed to complex environments, such as humid atmospheres and daily friction, which places stringent demands on the waterproofness, abrasion resistance, and adhesion of coatings. Good waterproof performance prevents damage to interior parts from moisture contact, high abrasion resistance ensures the interior remains aesthetically pleasing after long-term use, and excellent adhesion ensures the coating firmly adheres to the surface of the interior parts.

[0003] Currently, polyurethane coatings are commonly used for automotive interior parts, offering some decorative and basic protective properties. However, their water resistance is poor, and under extreme weather conditions or accidental contact with rain or liquid stains, the paint film is prone to blistering and peeling, leaving the interior parts unprotected and affecting their appearance. To improve waterproofing, the industry has gradually adopted polyurethane acrylate as the coating base material. Molecular structure optimization has improved the waterproofing effect to a certain extent, meeting basic waterproofing requirements. Addressing the issue of scratches and wear on high-end automotive interior parts due to frequent touching and friction during long-term use, existing technologies typically add wear-resistant fillers, such as silica, boron nitride, calcium carbonate, and talc, to the polyurethane acrylate system to enhance the surface hardness and wear resistance of the paint film.

[0004] However, existing waterproof coatings for automotive interior parts have significant drawbacks. The wear-resistant fillers in current technologies are mostly inorganic rigid particles, which have poor compatibility with organic resin substrates. Adding large amounts of wear-resistant fillers leads to a decrease in the uniformity of the coating system, resulting in reduced adhesion between the paint film and the interior substrate, causing problems such as paint film cracking and peeling. In other words, existing waterproof coatings for automotive interior parts suffer from a technical bottleneck: "it is difficult to synergistically optimize waterproofing and wear resistance, and adhesion decreases after wear resistance improvements," making it impossible to simultaneously achieve both wear resistance and adhesion stability. Summary of the Invention

[0005] The purpose of this application is to overcome the above-mentioned technical problems and provide a high-performance waterproof coating with wear-resistant and self-healing functions and a preparation method thereof.

[0006] Firstly, a high-performance waterproof coating with wear-resistant and self-healing properties is composed of the following raw materials by weight percentage: Water-resistant elastic resin 30-40% Modifier 8-15% Additives 1-5% The remainder is solvent; The modifier is composed of wax powder, hyperbranched acrylate oligomer, bis(2-methoxy-4-propylphenol)-terminated polydimethylsiloxane, and ureidopyrimidinone modified filler in a weight ratio of 1:(1-3):(0.5-1.5):(2-3).

[0007] The above solution, through precise control of raw material composition and ratio, achieves a synergistic effect between specific compound modifiers and water-resistant elastic resins, simultaneously optimizing the waterproofing, abrasion resistance, self-healing properties, and adhesion of the waterproof coating. The steric hindrance effect of the hydrophobic groups in the water-resistant elastic resin molecular structure endows the coating with basic waterproofing capabilities. The bis(2-methoxy-4-propylphenol)-terminated polydimethylsiloxane in the modifier possesses excellent hydrophobicity and molecular compatibility. Together, they form a dense hydrophobic protective layer on the paint film surface, enhancing waterproofing performance and providing long-lasting protection. The wax powder in the modifier forms a physical protective skeleton in the paint film, reducing damage from daily touch and friction. The ureidopyrimidinone groups grafted onto the surface of the ureidopyrimidinone modified filler can form a dynamic cross-linked structure through multiple hydrogen bonds, enabling rapid self-repair when scratches appear. Together, these two components give the coating both active protection against scratches and abrasion and passive repair capabilities against scratches. The terminal active groups of hyperbranched acrylate oligomers can undergo cross-linking reactions with the functional groups of water-resistant elastic resins, and at the same time form chemical bonds with the surface of automotive interior parts substrates, improving the adhesion strength between the paint film and the substrate, and also improving the system compatibility. In synergy with the flexible segments of bis(2-methoxy-4-propylphenol)-terminated polydimethylsiloxane regulating the internal stress of the paint film, the adhesion stability of the coating is ensured during long-term use. The modifier is formulated with each raw material in a specific weight ratio. Hyperbranched acrylate oligomers improve the system's compatibility and adhesion, providing a stable foundation for the performance of other functional components. Bis(2-methoxy-4-propylphenol)-terminated polydimethylsiloxane enhances water resistance and film flexibility. Wax powder and ureidopyrimidinone modified fillers improve wear resistance and self-healing performance from the perspectives of physical protection and chemical repair, respectively. The components form a precise synergy, enabling the coating to simultaneously possess excellent water resistance, high wear resistance, efficient self-healing ability, and stable adhesion. When applied to automotive interior parts, it can effectively reduce paint film peeling, hydrolysis, wear, scratches, and other phenomena, extend the service life of interior parts, and maintain the decorative effect and tactile feel of the interior for a long time, meeting the usage requirements of high-end automotive interiors.

[0008] Preferably, the wax powder is one or a combination of micronized amide wax, micronized high-density polyethylene wax, and PTFE-modified polyethylene wax micronized powder.

[0009] By adopting the above technical solution, the wax powder is selected from one or more of micronized amide wax, micronized high-density polyethylene wax, and PTFE-modified polyethylene wax powder. This type of wax powder possesses high hardness and a low coefficient of friction. Furthermore, its micronized form can form a uniformly distributed physical protective skeleton within the paint film. Micronized high-density polyethylene wax can enhance the compressive strength of the paint film surface, PTFE-modified polyethylene wax powder can reduce the coefficient of friction of the paint film surface and improve scratch resistance, and micronized amide wax can alleviate paint film brittleness while maintaining wear resistance. The wax powder is combined with ureapyrimidine... The ketone-modified filler forms a complementary relationship, giving the coating both active protection against scratches and abrasions and passive repair capabilities to self-heal scratches, maintaining the smoothness and aesthetics of automotive interior parts even after long-term use. The precise synergy of the modifier components, working in conjunction with the water-resistant elastic resin, gives the coating excellent water resistance, high abrasion resistance, efficient self-healing ability, and stable adhesion. When applied to automotive interior parts, it can effectively reduce paint film peeling, hydrolysis, wear, and scratches, extending the service life of interior parts and meeting the needs of high-end automotive interiors.

[0010] Preferably, the wax powder is composed of micronized amide wax, micronized high-density polyethylene wax, and PTFE-modified polyethylene wax micronized powder.

[0011] By adopting the above technical solutions, the rigid segments of micronized high-density polyethylene wax can enhance the compressive strength of the paint film surface and reduce surface damage caused by daily touch friction; PTFE-modified polyethylene wax micronized powder, with the super-lubricating properties of PTFE, can further reduce the coefficient of friction of the paint film surface and improve scratch resistance; micronized amide wax combines hardness and flexibility, which can alleviate the brittleness of the paint film while being wear-resistant. The wax powder formed by the combination of the three complements the ureidopyrimidinone modified filler, so that the coating has both active protection capabilities of "scratch resistance and wear resistance" and passive repair capabilities of "scratch self-repair". At the same time, this modifier works synergistically with water-resistant elastic resin, hyperbranched acrylate oligomer, and bis(2-methoxy-4-propylphenol)-terminated polydimethylsiloxane, so that the coating has excellent water resistance, high wear resistance, efficient self-repair ability and stable adhesion. When applied to automotive interior parts, it can effectively reduce paint film peeling, hydrolysis, wear, scratches and other phenomena, and extend the service life of interior parts.

[0012] Preferably, the ureidopyrimidinone modified filler is obtained by reacting nano-inorganic filler, N-aminoethyl-3-aminopropyltriethoxysilane, ureidopyrimidinone precursor, solvent, and organotin catalyst.

[0013] By adopting the above technical solution, a specific compound modifier works synergistically with a water-resistant elastic resin, and the ureidopyrimidinone modified filler is obtained by reacting nano-inorganic filler, N-aminoethyl-3-aminopropyltriethoxysilane, ureidopyrimidinone precursor, solvent, and organotin catalyst, thereby synergistically optimizing the waterproof coating's waterproofness, abrasion resistance, self-healing properties, and adhesion in multiple dimensions. The nano-inorganic filler, modified with N-aminoethyl-3-aminopropyltriethoxysilane, forms a stable composite filler. Its compatibility with elastic resin, wax powder, and siloxane components is significantly improved, allowing for uniform dispersion in the paint film and preventing the formation of hydrophilic channels. Simultaneously, the dense structure of the nano-inorganic filler further blocks water penetration pathways, synergistically achieving long-lasting waterproofing with multiple hydrophobic systems. The modifier components form a three-dimensional synergistic system of "substrate-modifier-filler." Specific wax powder and ureidopyrimidinone-modified filler form a core functional system of "physical wear resistance + dynamic repair." The coupling effect of N-aminoethyl-3-aminopropyltriethoxysilane solves the compatibility issues between inorganic fillers and organic phases. Processing aids ensure uniform filler dispersion, the ureidopyrimidinone precursor imparts dynamic repair capabilities, and the nano-inorganic filler strengthens physical protection. This results in a coating that simultaneously possesses excellent waterproofing, high wear resistance, efficient self-healing ability, and stable adhesion. When applied to automotive interior parts, it effectively reduces paint film peeling, hydrolysis, wear, and scratches, extending the service life of interior parts.

[0014] Preferably, the nano-inorganic filler is one or more of nano-alumina, nano-zirconia, fumed silica, and nano-zinc oxide.

[0015] By adopting the above technical solution, the nano-inorganic filler is selected from one or more of nano-alumina, nano-zirconia, fumed silica, and nano-zinc oxide. The dense crystalline structure of nano-alumina and zirconium oxide can physically block moisture, the porous structure of fumed silica can adsorb trace amounts of moisture in the system, and nano-zinc oxide has both hydrophobic and antibacterial properties. After modification with N-aminoethyl-3-aminopropyltriethoxysilane, it forms a structurally stable composite filler that can be uniformly dispersed in the resin matrix, avoiding the formation of hydrophilic channels. It works synergistically with the multiple hydrophobic systems to achieve a long-lasting waterproof effect. At the same time, combined with other technical means in the overall solution, the coating simultaneously possesses excellent waterproof properties, high wear resistance, efficient self-healing ability, and stable adhesion. When applied to automotive interior parts, it can effectively reduce paint film peeling, hydrolysis, wear, scratches, and other phenomena, extending the service life of the interior parts.

[0016] Preferably, the nano-inorganic filler is composed of nano-alumina, nano-zirconia, fumed silica, and nano-zinc oxide.

[0017] By adopting the above technical solutions, nano-alumina, nano-zirconia, fumed silica, and nano-zinc oxide are all low surface energy hydrophobic particles. The dense crystalline structure of nano-alumina and zirconia can physically block moisture, the porous structure of fumed silica can adsorb trace amounts of moisture in the system, and nano-zinc oxide has both hydrophobic and antibacterial properties. When the four types of fillers are used in combination, they form a structurally stable composite filler after modification with N-aminoethyl-3-aminopropyltriethoxysilane, avoiding the formation of hydrophilic channels. The synergistic effect of the multiple hydrophobic systems and the physical barrier effect of the nano-inorganic fillers achieves a long-lasting waterproof effect. This composite system, in conjunction with water-resistant elastic resin, wax powder, hyperbranched acrylate oligomers, and bis(2-methoxy-4-propylphenol)-terminated polydimethylsiloxane, enables the coating to simultaneously possess excellent waterproof properties, high wear resistance, efficient self-healing ability, and stable adhesion. When applied to automotive interior parts, it can effectively reduce paint film peeling, hydrolysis, wear, scratches, and other phenomena, extending the service life of interior parts.

[0018] Preferably, the ureidopyrimidinone modified filler is prepared by the following method: Uriidine pyrimidinone precursor: 2-amino-4-hydroxy-6-methylpyrimidin, hexamethylene diisocyanate and dimethylformamide are mixed evenly, heated and reacted, then n-hexane is added and allowed to stand. After precipitation, the ureidine pyrimidinone precursor is obtained by washing and drying. The nano-inorganic filler was thoroughly mixed with N-aminoethyl-3-aminopropyltriethoxysilane to obtain a surface amino filler. The surface amino filler was mixed evenly with the ureidopyrimidinone precursor, a solvent was added and the mixture was thoroughly mixed, then an organotin catalyst was added and mixed evenly. The mixture was heated to react, and after solid-liquid separation, washing and drying, the ureidopyrimidinone modified filler was obtained.

[0019] By employing the above technical solutions, specific nano-inorganic fillers (nano-alumina, nano-zirconia, fumed silica, and nano-zinc oxide) are all low-surface-energy hydrophobic particles. After modification with N-aminoethyl-3-aminopropyltriethoxysilane, they form structurally stable composite fillers. The solvent optimizes the filler dispersion environment, ensuring uniform dispersion of the composite filler in the resin matrix and preventing the formation of hydrophilic channels. The catalyst accelerates the reaction between N-aminoethyl-3-aminopropyltriethoxysilane and the nano-inorganic fillers and ureidopyrimidinone precursors, ensuring the stability of covalent bonds and further improving the compatibility of the filler with elastic resins, wax powders, and siloxane components. A dedicated preparation process achieves the production of ureidopyrimidinone. The precise control of the modified filler's structure and performance allows for several key steps. First, a high-purity, highly active isocyanate group precursor is obtained, laying the foundation for subsequent grafting reactions. Second, a modified filler with uniform surface amino density is formed, avoiding the problem of uneven amino distribution in traditional modification processes. Third, the ureidopyrimidinone groups are firmly grafted onto the surface of the nano-inorganic filler, resulting in a dense composite filler structure with excellent dispersibility. This further enhances the compatibility with elastic resins, wax powders, and siloxane components, allowing for uniform dispersion in the paint film and preventing the formation of hydrophilic channels. Simultaneously, the dense crystalline structure, porous adsorption characteristics, and hydrophobic antibacterial function of the nano-inorganic filler, in synergy with multiple hydrophobic systems, form a dual protection of physical barrier and chemical hydrophobicity, achieving long-lasting waterproofing. The high contact angle of the paint film maintains stable waterproofing performance.

[0020] Preferably, the water-resistant elastic resin is composed of silicone-modified polyurea resin and hydroxyl acrylic resin.

[0021] By adopting the above technical solution, the compounded silicone-modified polyurea resin and hydroxyl acrylic resin, as water-resistant elastic resins, can take into account hydrophobicity and water resistance, elastic recovery, film density and adhesion. Together with the hyperbranched acrylate oligomer, bis(2-methoxy-4-propylphenol)-terminated polydimethylsiloxane, wax powder, ureidopyrimidinone modified filler, as well as additives and solvents in the modifier, the coating simultaneously possesses extreme water resistance, ultra-high wear resistance, efficient self-healing ability and stable adhesion. It is suitable for the use in the closed space of automotive interiors. When applied to automotive interior parts, it can prevent paint film peeling, hydrolysis, wear, scratches, yellowing and other phenomena, extend the service life of interior parts and meet the stringent comprehensive requirements of high-end automotive interiors for performance, environmental protection, experience and weather resistance.

[0022] Preferably, the additive is a polyisocyanate curing agent, and the solvent is ethyl acetate and / or butyl acetate.

[0023] By adopting the above technical solution, the coating is composed of a specific weight percentage of water-resistant elastic resin, modifier, polyisocyanate curing agent, and ethyl acetate and / or butyl acetate solvent. The modifier is composed of wax powder, hyperbranched acrylate oligomer, bis(2-methoxy-4-propylphenol)-terminated polydimethylsiloxane, and ureidopyrimidinone modified filler in a specific weight ratio, which simultaneously optimizes the coating's waterproofness, abrasion resistance, self-healing properties, and adhesion. The polyisocyanate curing agent enables the coating to cure into a film better, and ethyl acetate and / or butyl acetate, as solvents, enable better and more uniform mixing of the raw materials, ensuring the stability of the coating system. When applied to automotive interior parts, it can effectively reduce paint film peeling, hydrolysis, wear, scratches, and other phenomena, extend the service life of interior parts, and maintain the decorative effect and tactile feel of the interior for a long time, meeting the usage requirements of high-end automotive interiors.

[0024] Secondly, a method for preparing a high-performance waterproof coating with wear-resistant and self-healing functions is obtained by the following method: Weigh out the elastic resin, modifier, and solvent, mix them evenly to completely dissolve the elastic resin, and obtain a mixture. The additives are then mixed evenly with the mixture to obtain a high-performance waterproof coating with wear-resistant and self-healing functions.

[0025] By employing the above technical solution and precisely controlling the composition and ratio of raw materials, a specific compound modifier and water-resistant elastic resin work synergistically to simultaneously optimize the waterproofing properties, abrasion resistance, self-healing ability, and adhesion of the waterproof coating. The water-resistant elastic resin provides basic waterproofing capabilities, while the bis(2-methoxy-4-propylphenol)-terminated polydimethylsiloxane in the modifier forms a hydrophobic protective layer, achieving long-lasting waterproofing. Wax powder forms a physical protective skeleton to enhance abrasion resistance, and ureidopyrimidinone-modified fillers achieve scratch self-healing through hydrogen bonding. Hyperbranched acrylate oligomers improve the adhesion strength between the paint film and the substrate, and the terminated polydimethylsiloxane regulates internal stress to ensure adhesion stability. This preparation method effectively yields high-performance waterproof coatings with excellent waterproofing, high abrasion resistance, good adhesion, and self-healing capabilities. It can reduce paint film peeling, hydrolysis, wear, and scratches on automotive interior parts, extending their service life and meeting the needs of high-end automotive interiors.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. Enhances waterproof performance and provides long-lasting protection. The steric hindrance effect of the hydrophobic groups contained in the water-resistant elastic resin gives the coating basic waterproof ability. Bis(2-methoxy-4-propylphenol)-terminated polydimethylsiloxane can form a dense hydrophobic protective layer on the paint film surface, reduce surface tension, reduce water penetration path, and the nano-inorganic filler can physically block water or adsorb trace amounts of water, working synergistically with multiple hydrophobic systems to achieve long-lasting waterproofing. 2. Synergistically enhance wear resistance and self-healing performance. The wax powder forms a physical protective skeleton in the paint film, reducing the occurrence of scratches. The ureidopyrimidinone modified filler achieves rapid self-repair when scratches appear through a dynamic cross-linking structure of multiple hydrogen bonds. The two form an integrated "prevention-repair" wear-resistant self-healing system. 3. Optimize adhesion and ensure stability. Hyperbranched acrylate oligomers can undergo cross-linking reactions with the functional groups of water-resistant elastic resins, forming chemical bonds with the surface of automotive interior parts substrates, improving the adhesion strength between the paint film and the substrate, and also improving system compatibility. Bis(2-methoxy-4-propylphenol)-terminated polydimethylsiloxane can regulate the internal stress of the paint film and reduce adhesion loss. Detailed Implementation

[0027] The present application will be described in further detail below with reference to the embodiments.

[0028] Micronized amide wax: Clariant Ceridust 3910; Micronized high-density polyethylene wax: Clariant Ceridust 3620; PTFE-modified polyethylene wax micron powder: Clariant Ceridust 3920F; The particle sizes of nano-alumina, nano-zirconia, fumed silica, and nano-zinc oxide are all 100-200 nm. Hyperbranched acrylate oligomers, UV7-4X, produced by Zhongshan Ganyou Chemical Materials Co., Ltd. Number-average molecular weight (Mn) of bis(2-methoxy-4-propylphenol)-terminated polydimethylsiloxane n The concentration is 3000–3500 g / mol.

[0029] Preparation example of ureidopyrimidinone modified filler

[0030] Preparation Example 1 A ureidopyrimidinone modified filler is prepared by the following method: Urimethimazole precursor: Weigh 1 part of 2-amino-4-hydroxy-6-methylpyrimidine, 2 parts of hexamethylene diisocyanate and other diisocyanates, and 1 part of dimethylformamide by weight. Stir at 100 r / min for 10 min to mix evenly. Heat to 95℃ at 5℃ / min and continue stirring for 12 h. Remove and stir evenly with 1 part of n-hexane. Stop stirring and let stand until precipitation occurs. Stand for 6 h. Filter, wash with ethanol, and dry in a vacuum drying oven for 6 h to obtain ureidazole precursor.

[0031] According to the weight, 2 parts of nano-inorganic filler (fumed silica) and 0.2 parts of N-aminoethyl-3-aminopropyltriethoxysilane were placed in a planetary stirrer and stirred for 30 minutes at a speed of 100 r / min to ensure that the nano-inorganic filler and N-aminoethyl-3-aminopropyltriethoxysilane were fully mixed and homogeneous to obtain surface amino filler. By weight, 1 part of surface amino filler and 1 part of ureidopyrimidinone precursor were placed in a stirring device and stirred for 10 min at 100 r / min until homogeneous. Then chloroform was added and the mixture was thoroughly mixed. Next, an organotin catalyst (stannous 2-ethylhexanoate) was added. The mixture was heated to 55°C under nitrogen protection and stirred for 3 h at 100 r / min. After the reaction, the mixture was filtered and then washed with anhydrous ethanol. Finally, it was dried in a vacuum drying oven until all small molecules such as chloroform and anhydrous ethanol were removed, thus obtaining the ureidopyrimidinone modified filler.

[0032] Preparation Example 2 The difference between Preparation Example 2 and Preparation Example 1 is that the nano-inorganic filler is nano-zirconia.

[0033] Preparation Example 3 The difference between Preparation Example 3 and Preparation Example 1 is that the nano-inorganic filler is composed of nano-alumina, nano-zirconia, fumed silica, and nano-zinc oxide in a weight ratio of 1:0.5:3:0.5. Example

[0034] Example 1 A high-performance waterproof coating with wear-resistant and self-healing properties is obtained by the following method: Weigh out 36% elastic resin, 13% modifier, and 48% solvent by weight, mix them evenly to completely dissolve the elastic resin, and obtain a mixture. Then mix 3% of the additive with the entire mixture evenly (150 rpm, 10 min) to obtain a high-performance waterproof coating with wear-resistant and self-healing functions.

[0035] The modifier is composed of wax powder, hyperbranched acrylate oligomer, bis(2-methoxy-4-propylphenol)-terminated polydimethylsiloxane, and the ureidopyrimidinone modified filler obtained in Preparation Example 1 in a weight ratio of 1:2.1:0.9:2.

[0036] The additive is a polyisocyanate curing agent (BASF aliphatic isocyanate curing agent Basonat HI100 ap); the solvent is ethyl acetate. The elastic resin is composed of silicone-modified polyurea resin (Sika Sikalastic®-702 THX) and hydroxyl acrylic resin (Elementis Hypomer FS-3270F) in a weight ratio of 1:1.

[0037] Example 2 The difference between Example 2 and Example 1 lies in the amount of raw materials used, as detailed below: Weigh out 30% water-resistant elastic resin, 15% modifier, and 1% additives according to percentages, and then add solvent to make up to 100%.

[0038] The modifier is composed of wax powder, hyperbranched acrylate oligomer, bis(2-methoxy-4-propylphenol)-terminated polydimethylsiloxane, and the ureidopyrimidinone modified filler obtained in Preparation Example 1 in a weight ratio of 1:2:1.5:3.

[0039] Example 3 The difference between Example 3 and Example 1 lies in the amount of raw materials used, as detailed below: Weigh out 40% water-resistant elastic resin, 8% modifier, and 5% additives according to percentages, and then add solvent to make up to 100%. The modifier consists of wax powder, hyperbranched acrylate oligomer, bis(2-methoxy-4-propylphenol)-terminated polydimethylsiloxane, and the ureidopyrimidinone modified filler obtained in Preparation Example 1 in a weight ratio of 1:2:1.5:3.

[0040] Example 4 The difference between Example 4 and Example 1 is that the ureidopyrimidinone modified filler obtained in Preparation Example 2 was used.

[0041] Example 5 The difference between Example 5 and Example 1 is that the ureidopyrimidinone modified filler obtained in Preparation Example 3 was used.

[0042] Comparative Example

[0043] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the hyperbranched acrylate oligomer was replaced in equal amounts with ureidopyrimidinone modified filler.

[0044] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the ureidopyrimidinone modified filler was replaced in equal amounts with the surface amino filler in Preparation Example 1.

[0045] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that the modifier is a ureidopyrimidinone modified filler.

[0046] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that the modifier is composed of hyperbranched acrylate oligomer and ureidopyrimidinone modified filler in a weight ratio of 1:3.

[0047] Performance testing 1) Abrasion resistance test Test method: Martindale abrasion test, GB / T21196.3-2007; Samples: The high-performance waterproof coatings with wear-resistant and self-healing functions obtained in Examples 1-5 and Comparative Examples 1-4 were sprayed onto commonly used automotive interior substrates (ABS plastic sheets), cured at 60°C for 2 hours, and then placed at room temperature for 24 hours before cutting 100mm×100mm samples. The film thickness was controlled at 120μm. Conditions: Load 500g, friction medium is standard wool cloth, friction speed 40 times / min, friction stroke 24mm; Observation: After every 2000 rubs, observe whether the paint film shows any exposure or damage. Record the number of rubs when the first exposure / damage occurs. When the number of rubs reaches 12000, if there is no exposure or obvious scratches or damage, it is considered to have passed the abrasion resistance test.

[0048] 2) Scratch self-healing efficiency test Sample: Same as the abrasion resistance test sample in 1); refer to GB / T37363.2-2019 "Test Method for Self-Healing Performance of Coatings Part 2: Scratch Repair Method"; Scratch preparation: use a scratch tester, select a 1H pencil, load 500g, and scratch a 2cm long and 0.1mm deep scratch on the paint film surface at a speed of 5mm / s; Repair conditions: place the sample in an environment of 25℃ and 50% relative humidity and observe the scratch recovery after 6 hours; Quantification: use a laser confocal 50x microscope to test the depth of the scratch before and after repair, and calculate the repair rate (repair rate = (initial depth - remaining depth) / initial depth × 100%).

[0049] 3) Adhesion test Sample: Same as 1) Sprayed onto a commonly used automotive interior substrate (ABS plastic sheet), and cut into 100mm×100mm samples after curing; Method: According to the cross-cut method (GB / T9286-1998), use a cross-cut cutter to cut a 1mm×1mm grid (100 grids), apply 3M 610 tape, and quickly tear it vertically 3 times; Observation: Statistical analysis of the area of ​​grid peeling. GB / T9286-1998 "Cross-cut test for paint and varnish films"; When the adhesion reaches level 0, it is considered qualified.

[0050] 4) Waterproof performance Refer to GB / T 1733-1993 "Method for Determining Water Resistance of Paint Films"; Specimen: The same specimen as in 1) Wear Resistance Test, with edge sealed treatment; Simulated rainwater preparation: Prepare artificial seawater (salinity 3.5%) according to GB / T 10125-2021 to simulate the rainwater environment; Condition: Immerse the specimen completely in artificial seawater at 60°C for 96 h continuously; Post-treatment: Take out the specimen, rinse it thoroughly with deionized water, and after natural drying for 24 h, test the paint film adhesion, appearance and waterproof performance.

[0051] After soaking for 96 h: Appearance: No blistering, wrinkling, peeling, or discoloration; Adhesion: The cross-cut method test still reaches level 0; Waterproofness: The contact angle of the paint film ≥ 120°, and there is no trace of water penetration; When the above conditions are met simultaneously, it is recorded as qualified waterproof performance.

[0052] The above experimental data are specifically shown in Table 1; Table 1 Experimental data of Examples 1-5 and Comparative Examples 1-4

[0053] Combined with Example 1 and Comparative Examples 1-4, it can be seen that the waterproof performance and wear resistance of Comparative Examples 1-4 are both unqualified, the adhesion of Comparative Examples 1 and 3 is unqualified, and the scratch repair efficiency of Comparative Examples 1-4 is 90%. While in Example 1, not only the waterproof performance, wear resistance and adhesion are all qualified, but the scratch repair ability reaches 96.8%, which is more than 7% higher than that of Comparative Examples 1-4. Thus, it can be shown that the modifier of this application is composed of, which can play a synergistic role, enabling the high-performance waterproof coating to obtain better wear resistance and self-repair performance on the basis of ensuring good adhesion and waterproof performance after being applied and cured on the surface of automotive parts, so as to improve the practicability in high-end automotive interiors.

[0054] This specific embodiment is only an explanation of this application, and it is not a limitation of this application. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs after reading this specification, but as long as it is within the scope of the claims of this application, it is protected by the patent law.

Claims

1. A high-performance waterproof coating with wear-resistant and self-healing properties, characterized in that, It consists of the following raw materials by weight percentage: Water-resistant elastic resin 30-40% Modifier 8-15% Additives 1-5% The remainder is solvent; The modifier is composed of wax powder, hyperbranched acrylate oligomer, bis(2-methoxy-4-propylphenol)-terminated polydimethylsiloxane, and ureidopyrimidinone modified filler in a weight ratio of 1:(1-3):(0.5-1.5):(2-3).

2. The high-performance waterproof coating with wear-resistant and self-healing function according to claim 1, characterized in that: The wax powder is one or a combination of micronized amide wax, micronized high-density polyethylene wax, and PTFE-modified polyethylene wax micronized powder.

3. The high-performance waterproof coating with wear-resistant and self-healing function according to claim 2, characterized in that: The wax powder is composed of micronized amide wax, micronized high-density polyethylene wax, and PTFE-modified polyethylene wax micronized powder.

4. The high-performance waterproof coating with wear-resistant and self-healing function according to claim 1, characterized in that: The ureidopyrimidinone modified filler is obtained by reacting nano-inorganic filler, N-aminoethyl-3-aminopropyltriethoxysilane, ureidopyrimidinone precursor, solvent, and organotin catalyst.

5. A high-performance waterproof coating with wear-resistant and self-healing function according to claim 4, characterized in that: The nano-inorganic filler is one or more of nano-alumina, nano-zirconia, fumed silica, and nano-zinc oxide.

6. A high-performance waterproof coating with wear-resistant and self-healing function according to claim 5, characterized in that: The nano-inorganic filler is composed of nano-alumina, nano-zirconia, fumed silica, and nano-zinc oxide.

7. A high-performance waterproof coating with wear-resistant and self-healing function according to claim 4, characterized in that, The ureidopyrimidinone modified filler was prepared by the following method: Uriidine pyrimidinone precursor: 2-amino-4-hydroxy-6-methylpyrimidin, hexamethylene diisocyanate and dimethylformamide are mixed evenly, heated and reacted, then n-hexane is added and allowed to stand. After precipitation, the ureidine pyrimidinone precursor is obtained by washing and drying. The nano-inorganic filler was thoroughly mixed with N-aminoethyl-3-aminopropyltriethoxysilane to obtain a surface amino filler. The surface amino filler was mixed evenly with the ureidopyrimidinone precursor, a solvent was added and the mixture was thoroughly mixed, then an organotin catalyst was added and mixed evenly. The mixture was heated to react, and after solid-liquid separation, washing and drying, the ureidopyrimidinone modified filler was obtained.

8. A high-performance waterproof coating with wear-resistant and self-healing function according to claim 1, characterized in that: The water-resistant elastic resin is composed of silicone-modified polyurea resin and hydroxyl acrylic resin.

9. A high-performance waterproof coating with wear-resistant and self-healing function according to claim 1, characterized in that: The additive is a polyisocyanate curing agent, and the solvent is ethyl acetate and / or butyl acetate.

10. A method for preparing a high-performance waterproof coating with wear-resistant and self-healing function as described in any one of claims 1-9, characterized in that, Obtained by the following method: Weigh out the elastic resin, modifier, and solvent, mix them evenly to completely dissolve the elastic resin, and obtain a mixture. The additives are then mixed evenly with the mixture to obtain a high-performance waterproof coating with wear-resistant and self-healing functions.

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