Wear-resistant and sweat-resistant acrylic paint, and preparation method and application thereof

Abstract

The application provides a wear-resistant and sweat-resistant acrylic paint, a preparation method and application thereof, and belongs to the technical field of paints.The wear-resistant and sweat-resistant acrylic paint disclosed by the application is composed of the following raw materials in parts by weight: 30-50 parts of water-based acrylic resin, 15-20 parts of cashew phenol-based polyurethane resin, 0.8-1.5 parts of adhesion promoter, 3-5 parts of titanate coupling agent, 3-15 parts of filler, 0.5-1.8 parts of thickening agent, 0.5-2.0 parts of leveling agent, 0.5-1.0 parts of wetting agent, 0.5-1.5 parts of defoaming agent, 0.5-2 parts of cosolvent and 5-15 parts of water; wherein the components of the water-based acrylic resin include acrylic monomer, dithio glycolic acid, tri-n-butyl borane and aziridine crosslinking agent; and a preparation method of the acrylic paint is also provided.The acrylic paint provided by the application has excellent mechanical properties, good adhesion, excellent water resistance, scratch resistance, wear resistance, chemical resistance, sweat resistance and corrosion resistance and the like, and can be applied to 3C products and the glasses industry, thereby prolonging the service life of the products.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coatings, and particularly relates to a wear-resistant and sweat-resistant acrylic coating and a preparation method thereof, and application of the acrylic coating in 3C products and the eyewear industry. BACKGROUND

[0002] With the increasing intelligence and mobile internet of people's life, people use electronic products (collectively referred to as 3C products) and eyewear more and more, and thus people have higher and higher requirements for the quality of these products. However, the electronic products or eyewear are touched, knocked and rubbed by hands for a long time, which affects the appearance, comfort and durability of the products. Meanwhile, the sweat on the hands of human body contains salt, acid-base components and other chemical substances, which may erode the surface of the products. Therefore, the coating coated on the surface of the products needs to have good wear resistance, sweat resistance, lightness, adhesion, solvent resistance, water resistance and other properties to ensure the service life and appearance of the products.

[0003] The acrylic coating is a kind of coating with acrylic resin as the main film-forming material, and proper pigments, solvents and additives are added according to the requirements, and a hard paint film is formed through chemical reaction, which has good gloss, weather resistance, chemical resistance and other properties, and is cheap. However, the traditional acrylic coating is generally solvent-based, and a large amount of organic matter is emitted after coating, which may affect the health of the human body under the action of ozone produced by the organic volatile matter under light. Compared with the solvent-based acrylic coating, the water-based acrylic coating uses water instead of organic solvent, reduces the release of VOC, and belongs to an environmentally friendly coating, which is also the focus of research by researchers in various countries. The existing water-based acrylic coating not only has excellent gloss and adhesion, but also has excellent weather resistance and chemical resistance. However, the physical properties are poor, and the hardness, wear resistance, scratch resistance, water resistance, sweat resistance and other properties are not good. Therefore, it is necessary to develop an acrylic coating with good wear resistance, sweat resistance, water resistance, adhesion, scratch resistance and other properties to meet the use requirements of 3C products and eyewear, and thus prolong the service life of the products.

[0004] The invention patent CN201911068870.1 discloses a sweat-resistant water-soluble acrylic resin paint, the components of the paint include fluorine-containing acrylic resin, butyl etherized amino resin, dispersing agent, defoaming agent, leveling agent, water, wherein the fluorine-containing acrylic resin is composed of components such as fluorine-containing acrylic monomer, acrylic acid, methyl methacrylate, isooctyl methacrylate, etc., has the characteristics of sweat resistance and high wear resistance, but the paint has poor solvent resistance, general corrosion resistance, and high cost. The invention patent CN202310106193.8 discloses a water-based acrylic paint, the components of the paint include 50-60 parts of water-based acrylic emulsion, 5-10 parts of bromocarbon alcohol acid resin, 5-10 parts of silane coupling agent, 10-15 parts of pigment and 1-5 parts of polyaniline, and the coating obtained after curing of the water-based acrylic paint has good weather resistance, corrosion resistance and adhesion, but the paint has poor water resistance, and the wear resistance and sweat resistance are general, and cannot be applied to electronic products or glasses. SUMMARY

[0005] The purpose of the present application is to provide a wear-resistant and sweat-resistant acrylic paint, the mechanical properties of the coating obtained after curing of the acrylic paint are excellent, the adhesion is good, and the coating has excellent water resistance, scratch resistance, wear resistance, chemical resistance, sweat resistance and corrosion resistance, etc., and can be applied to 3C products and glasses industry, prolonging the service life of the products.

[0006] In order to achieve the purpose of the present application, the present application provides a wear-resistant and sweat-resistant acrylic paint, which is composed of the following raw materials in parts by weight: water-based acrylic resin 30-50 parts, cashew phenol-based polyurethane resin 15-20 parts, adhesion promoter 0.8-1.5 parts, titanate coupling agent 3-5 parts, filler 3-15 parts, thickening agent 0.5-1.8 parts, leveling agent 0.5-2.0 parts, wetting agent 0.5-1.0 parts, defoaming agent 0.5-1.5 parts, cosolvent 0.5-2 parts and water 5-15 parts.

[0007] Preferably, the titanate coupling agent is isopropyl dioleate acyloxy (dioctyl phosphoric acyloxy) titanate, i.e. titanate coupling agent 101. The addition of the titanate coupling agent makes the components uniformly dispersed in the paint, thereby improving the adhesion of the paint and the water resistance, weather resistance and corrosion resistance of the water-based acrylic paint.

[0008] Preferably, the thickening agent is selected from any one of hydroxyethyl cellulose, organic bentonite and associated polyurethane thickening agent. The addition of the thickening agent improves the rheological property and storage stability of the paint, prevents paint construction from sagging, has good leveling property, and thereby makes the coating film smooth and has high gloss.

[0009] Preferably, the leveling agent is selected from organic silicon rheological agents, which improves the dispersibility of the paint, improves the rapid leveling performance of the paint during construction, and further improves the coating effect and quality.

[0010] Preferably, the wetting agent is selected from alkyl polyoxyethylene ethers, which improves the dispersibility and wettability of the paint system, can effectively reduce the surface tension of the paint, and further improves the adhesion of the paint coating.

[0011] Preferably, the defoaming agent is any one of phenylethanol oleate, dimethyl silicone oil or polyoxypropylene glycerol ester, which is used to reduce the surface tension of the foam, achieve rapid defoaming and long-term bubble suppression, improve the powder rate and spraying effect of the paint, ensure the wear resistance and durability of the coating, and further ensure the flatness and aesthetics of the coating surface.

[0012] Preferably, the cosolvent is ethanol or 1-methoxy-2-propanol, which can adjust the viscosity of the paint and play a balancing role, so that the paint has high stability and can be stored stably for a long time, prolonging the storage life of the paint.

[0013] The preparation method of the water-based acrylic resin specifically comprises the following steps:

[0014] S1. First, 1 / 2 mass of tri-n-butylborane is added to a proper amount of ethylene glycol butyl ether and dissolved completely, and then added to a reaction kettle, and heated to 60-70℃;

[0015] S2. The acrylic monomer, 1 / 3 mass of aziridine crosslinking agent and the remaining tri-n-butylborane are weighed according to the formula, uniformly mixed, and then uniformly added to the reaction kettle within 2-3h, the reaction temperature is controlled at 70-80℃, and the reaction is kept for 1-1.5h, then the dithio glycolic acid and the remaining aziridine crosslinking agent are added dropwise, the dropwise adding time is controlled within 30min, and the reaction is carried out for 2-3h;

[0016] S3. After the reaction is completed, the temperature of the reaction kettle is reduced to 40℃, ammonia water is added while stirring for neutralization, stirring reaction is carried out for 15-25min, and then cooled to room temperature to obtain the acrylic resin;

[0017] S4. The acrylic resin, anhydrous ethanol and deionized water are fully stirred and uniformly mixed to obtain the water-based acrylic resin.

[0018] Further, the water-based acrylic resin is composed of the following raw materials by weight: 82-90 parts of acrylic monomer, 3-7 parts of dithio glycolic acid, 2-4 parts of tri-n-butylborane and 2-5 parts of aziridine crosslinking agent.

[0019] In the step S4, the mass of the anhydrous ethanol is 20-25% of the mass of the acrylic resin; and the mass of the deionized water is 30-35% of the mass of the acrylic resin.

[0020] Further, the acrylic monomer is composed of the following monomers by weight parts: methyl methacrylate 45-55 parts, t-butyl methacrylate 20-30 parts, acrylamide 3-6 parts, pentaerythritol triacrylate 14-18 parts and vinyl acrylic acid 4-6 parts.

[0021] The coating of the present application adopts water-based acrylic resin as the main film-forming matrix, and is prepared by polymerization reaction of acrylic monomers under the action of aziridine crosslinking agent and tri-n-butyl borane, and then introducing dithioglycolic acid for reaction. The acrylic monomer in the present application is composed of methyl methacrylate, t-butyl methacrylate, acrylamide, pentaerythritol triacrylate and vinyl acrylic acid in specific proportions, and the different properties of the acrylic monomers are used in combination, so that the structure after polymerization contains specific group segments, which not only ensures high hardness, high toughness and high strength of the acrylic resin, but also improves the adhesion, weather resistance, sweat resistance and corrosion resistance of the acrylic resin; the selection of monomer types and the ratio is beneficial to the improvement of the crosslinking density of the coating, thereby increasing the hardness and wear resistance of the coating; the use of aziridine crosslinking agent and pentaerythritol triacrylate improves the sweat resistance and water resistance of the present application, but the water resistance and sweat resistance are not good if the temperature is too high; the addition of vinyl acrylic acid ensures that the coating has good toughness, and also has high hardness and good wear resistance. The introduction of dithioglycolic acid improves the wear resistance of the present application without affecting other properties of the coating.

[0022] Further, the preparation method of the cardanol-based polyurethane resin specifically comprises the following steps:

[0023] P1. Cardanol-based polyol and polypropylene glycol are added to a container, vacuumized at 100-120℃ for 1.0-2.0h, then the vacuum is released and nitrogen is introduced, cooled to 40-50℃, and dibutyltin dilaurate and hexamethylene diisocyanate are added, and the temperature is raised to 70-80℃ for 1-2h to obtain a prepolymer;

[0024] P2. Polytetrahydrofuran diol is added to the above prepolymer, and the reaction is continued at 70-80℃ for 3-4h, then the temperature is lowered to 50-60℃, and hydroxyethyl methacrylate is added, and the temperature is kept for 2-4h until the -NCO content is ≤0.1%, then it is naturally cooled and vacuumized for 5-10min to obtain a cardanol-based polyurethane resin.

[0025] Further, the mass ratio of hexamethylene diisocyanate to cardanol-based polyol is (40-60):100;

[0026] The adding amount of the polypropylene glycol is 15-30% of the total mass of the hexamethylene diisocyanate and the cashew phenol-based polyol;

[0027] The adding amount of the dibutyl tin dilaurate is 0.06-0.10% of the total mass of the hexamethylene diisocyanate and the cashew phenol-based polyol;

[0028] The adding amount of the polytetrahydrofuran diol is 2.0-2.8% of the total mass of the hexamethylene diisocyanate and the cashew phenol-based polyol;

[0029] The mass ratio of the hydroxyethyl methacrylate to the hexamethylene diisocyanate is 1:(0.5-0.65).

[0030] Further, the cashew phenol-based polyol has a hydroxyl value of 175 mg KOH / g and a functionality of 3.8.

[0031] The present application significantly improves the mechanical strength, adhesion and water resistance of the acrylic coating layer by adding the cashew phenol-based polyurethane resin, and also improves the high temperature resistance, sweat resistance, wear resistance and chemical corrosion resistance of the acrylic coating. The cashew phenol-based polyurethane resin of the present application is prepared by using cashew phenol-based polyol and hexamethylene diisocyanate under the action of dibutyl tin dilaurate to obtain a polyurethane prepolymer containing a cashew phenol group, then adding polytetrahydrofuran diol for reaction, and finally adding hydroxyethyl methacrylate for capping. Compared with conventional polyether polyols, the use of cashew phenol-based polyol to prepare polyurethane in the present application significantly improves the adhesion, wear resistance, water resistance, chemical resistance and sweat resistance of the coating of the present application; the addition of polytetrahydrofuran diol not only increases the strength and toughness of the waterborne polyurethane resin, but also improves the viscosity, water resistance, wear resistance and weather resistance of the coating of the present application; the use of hydroxyethyl methacrylate for capping improves the stability of the cashew phenol-based polyurethane resin in the acrylic coating, increases the compatibility between the cashew phenol-based polyurethane resin and other components in the coating of the present application, and improves the adhesion, water resistance and sweat resistance of the coating of the present application.

[0032] Further, the adhesion promoter is composed of a silane compound containing azole, a hyperbranched unsaturated resin and polyvinylpyrrolidone in a mass ratio of (1.2-1.5):(2.0-2.5):1.

[0033] The adhesion promoter prepared by compounding the azole-containing silane compound, the hyperbranched unsaturated resin and the polyvinylpyrrolidone in a specific ratio not only improves the adhesion between the coating and the substrate, but also significantly improves the sweat resistance, wear resistance, chemical corrosion resistance, weather resistance and the like of the coating layer of the coating. The addition of the polyvinylpyrrolidone improves the compatibility between the azole-containing silane compound and the hyperbranched unsaturated resin, and also makes the adhesion promoter uniformly dispersed in the acrylic coating system, thereby increasing the adhesion of the coating layer. The addition of the azole-containing silane compound not only improves the adhesion of the coating, but also improves the water resistance, sweat resistance and corrosion resistance of the coating. The combination of the azole-containing silane compound and the hyperbranched unsaturated resin enables the coating to still have relatively good sweat resistance and wear resistance in a high-temperature environment.

[0034] Further, the azole-containing silane compound is a triazole silane compound.

[0035] The application further provides a preparation method of the wear-resistant and sweat-resistant acrylic coating, specifically comprising the following steps:

[0036] (1) uniformly mixing the water-based acrylic resin, the cardanol-based polyurethane resin, the adhesion promoter and water to obtain a first mixture;

[0037] (2) uniformly mixing the titanate coupling agent, the filler and the cosolvent to obtain a second mixture;

[0038] (3) uniformly mixing the first mixture and the second mixture, then uniformly stirring the leveling agent, the wetting agent and the defoaming agent, and finally adding the thickening agent and uniformly dispersing at a speed of 1200-1500 rpm to obtain the acrylic coating.

[0039] The application has the following beneficial effects:

[0040] 1. The coating is mainly prepared from the water-based acrylic resin, and different acrylic monomers are combined in a proper ratio to ensure that the obtained coating layer has excellent mechanical strength, adhesion, weather resistance and corrosion resistance, and the water resistance and wear resistance of the coating layer are also improved. The cardanol-based polyurethane resin is added for compounding, which improves the adhesion, water resistance, wear resistance and corrosion resistance of the coating, shortens the film forming time, and makes the coating have excellent sweat resistance and chemical solvent resistance. The addition of the adhesion promoter not only enhances the adhesion between the coating and the substrate, but also improves the sweat resistance, wear resistance and chemical corrosion resistance of the coating. The addition of the titanate coupling agent, the filler, the thickening agent, the leveling agent, the wetting agent, the defoaming agent and the like improves the stability of the coating, further ensures that the coating has excellent comprehensive performance, and prolongs the service life of the coating in electronic products.

[0041] 2. The raw materials selected in the present invention are environmentally friendly, low in cost, simple in preparation process, low in energy consumption, and do not contain volatile and toxic substances, thus meeting the requirements of national environmental protection laws.

[0042] 3. The coating of the present invention has low viscosity and can be applied by processes such as flow coating and spray coating. It is simple to operate, has a short film-forming time, high production efficiency, low cost, and can be operated automatically.

[0043] 4. The coating prepared by the coating of the present invention is dense, has high adhesion, hardness and mechanical strength, and has excellent chemical corrosion resistance, flame retardancy, weather resistance, sweat resistance and wear resistance. It can be used in 3C products and the eyewear industry, extending the service life of the product. DETAILED DESCRIPTION

[0044] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0045] The wear-resistant and sweat-resistant acrylic paint and its preparation method of the present invention are described below with reference to specific embodiments.

[0046] Example 1

[0047] The preparation method of the wear-resistant and sweat-resistant acrylic paint of this embodiment 1 is as follows:

[0048] (1) mixing 30 parts of water-based acrylic resin, 15 parts of cardanol-based polyurethane resin, 0.8 parts of adhesion promoter and 10 parts of water to obtain a first mixture;

[0049] (2) 3.2 parts of titanate coupling agent 101 (i.e., isopropyl dioleate acyloxy (dioctyl phosphate acyloxy), 8.5 parts of filler, and 1.1 parts of ethanol were mixed to obtain a second mixture;

[0050] (3) The first mixture and the second mixture were mixed evenly, and then 0.5 parts of BYK 7305 rheological agent, 0.5 parts of alkyl polyoxyethylene ether HY-352 and 0.6 parts of dimethyl silicone oil were added and stirred evenly, and finally 0.8 parts of non-ionic polyurethane thickener were added and dispersed evenly at a rate of 1200 rpm to obtain a wear-resistant and sweat-resistant acrylic coating.

[0051] The preparation process of the above-mentioned water-based acrylic resin is as follows: 1 part of tri-n-butylborane is added into a proper amount of ethylene glycol butyl ether to be completely dissolved, and then added into a reaction kettle, and warmed to 60°C; then 82 parts of acrylic monomer, 0.8 parts of aziridine crosslinking agent and 1 part of tri-n-butylborane are weighed and uniformly mixed, and uniformly added into the reaction kettle, and the addition should be completed within 2.5 hours, and the temperature is increased to 80°C during the addition process, and after the addition is completed, the temperature is continued to be kept at 80°C for 1.5 hours, and then 4.2 parts of dithio glycolic acid and 1.6 parts of aziridine crosslinking agent are added, and the addition time is controlled within 30 minutes, and the reaction is carried out for 3 hours; after the reaction is completed, the temperature of the reaction kettle is reduced to 40°C, and ammonia water is added for neutralization while stirring, and the stirring reaction is carried out for 20 minutes, and then cooled to room temperature to obtain the acrylic resin; 100 parts of the prepared acrylic resin, 24 parts of anhydrous ethanol and 32 parts of deionized water are uniformly stirred to obtain the water-based acrylic resin.

[0052] The components of the above-mentioned acrylic monomer are as follows: 45 parts of methyl methacrylate, 30 parts of tert-butyl methacrylate, 6 parts of acrylamide, 14 parts of pentaerythritol triacrylate and 5 parts of vinyl acrylic acid.

[0053] The preparation process of the above-mentioned cardanol-based polyurethane resin is as follows: 100 parts of cardanol-based polyol (hydroxyl value is 175 mgKOH / g, and functionality is 3.8) and 33.6 parts of polypropylene glycol 2000 are added into a container, vacuumized at 110°C for 2.0 hours, then the vacuum is released and nitrogen is introduced, cooled to 40°C, 0.12 parts of dibutyltin dilaurate and 52.6 parts of hexamethylene diisocyanate are added, and warmed to 75°C for reaction for 2 hours to obtain a prepolymer; 3.8 parts of polytetrahydrofuran diol is added into the prepared prepolymer, and continued to be reacted at 75°C for 3 hours, then cooled to 60°C, 94 parts of hydroxyethyl methacrylate is added, and kept for 4 hours until the -NCO content is less than or equal to 0.1%, then naturally cooled and vacuumized for 10 minutes to obtain the cardanol-based polyurethane resin.

[0054] The above-mentioned adhesion promoter is composed of triazole silane compound, hyperbranched unsaturated resin Hyper U102 and polyvinylpyrrolidone with a mass ratio of 1.5:2:1, that is, the triazole silane compound and polyvinylpyrrolidone are uniformly mixed, then the hyperbranched unsaturated resin Hyper U102 is added and uniformly mixed.

[0055] The preparation process of the above triazole silane compound is as follows: a 20% sodium carbonate solution is added to a mixed solution of 3-amino-5-ethyl-1, 2, 4-triazole and N-methyl pyrrolidone 100 mL at room temperature, heated to 60°C and stirred for 1 h, then 3-chloropropyl triethoxysilane is added, stirred at 80°C for 6 h, after the reaction is completed, cooled to room temperature, filtered, the filter cake is washed with 2% NaHCO3 solution and deionized water until neutral, dried, and the triazole silane compound is obtained; the molar ratio of 3-amino-5-ethyl-1, 2, 4-triazole, sodium carbonate solution and 3-chloropropyl triethoxysilane is 1:1:1. (The triazole silane compound used in the following examples and comparative examples is the same as this, which will not be repeated below)

[0056] The above filler is composed of titanium white and talc in a mass ratio of 1:1.

[0057] Example 2

[0058] The preparation method of the wear-resistant and sweat-resistant acrylic coating of the present example 2 is as follows in terms of mass fraction:

[0059] (1) 50 parts of water-based acrylic resin, 20 parts of cardanol-based polyurethane resin, 1.5 parts of adhesion promoter and 15 parts of water are uniformly mixed to obtain a first mixture;

[0060] (2) 4.3 parts of titanate coupling agent 101, 14.6 parts of filler and 1.8 parts of 1-methoxy-2-propanol are uniformly mixed to obtain a second mixture;

[0061] (3) The first mixture and the second mixture are uniformly mixed, then 1.2 parts of BYK 7305 rheological agent, 0.9 parts of alkyl polyoxyethylene ether HY-352 and 1.2 parts of dimethyl silicone oil are uniformly stirred, and finally 1.8 parts of non-ionic polyurethane thickener is added and uniformly dispersed at a speed of 1500 rpm to obtain the wear-resistant and sweat-resistant acrylic coating.

[0062] The preparation process of the above water-based acrylic resin is as follows: 2 parts of tri-n-butylborane is first added into a proper amount of ethylene glycol butyl ether to dissolve completely, and then added into a reaction kettle, and heated to 60°C; then 90 parts of acrylic monomer, 1.6 parts of aziridine crosslinking agent and 2 parts of tri-n-butylborane are mixed uniformly, and uniformly added into the reaction kettle, which needs to be completed within 3 hours, and the temperature is increased to 80°C during the adding process, and after the adding process is completed, the temperature is continued to be kept at 80°C for 1.5 hours, and then 7 parts of dithio glycolic acid and 3.2 parts of aziridine crosslinking agent are added, and the adding time is controlled within 30 minutes, and the reaction is carried out for 3 hours; after the reaction is completed, the temperature of the reaction kettle is reduced to 40°C, and ammonia water is added for neutralization while stirring, and the stirring reaction is carried out for 20 minutes, and then cooled to room temperature to obtain the acrylic resin; 100 parts of the prepared acrylic resin, 24 parts of anhydrous ethanol and 32 parts of deionized water are fully stirred and uniformly mixed to obtain the water-based acrylic resin.

[0063] The components of the above acrylic monomer are as follows: 55 parts of methyl methacrylate, 20 parts of tert-butyl methacrylate, 3 parts of acrylamide, 18 parts of pentaerythritol triacrylate and 4 parts of vinyl acrylic acid.

[0064] The sources of the above aziridine crosslinking agent and dithio glycolic acid are the same as those in Example 1.

[0065] The preparation process of the above cardanol-based polyurethane resin is the same as that in Example 1, and for reference, please refer to Example 1.

[0066] The above adhesion promoter is composed of triazole silane compound, hyperbranched unsaturated resin Hyper U102 and polyvinylpyrrolidone with a mass ratio of 1.5:2.5:1, that is, the triazole silane compound and polyvinylpyrrolidone are first fully mixed and uniformly mixed, and then the hyperbranched unsaturated resin Hyper U102 is added and uniformly mixed.

[0067] The above filler is composed of titanium white and talc with a mass ratio of 1:1.

[0068] Example 3

[0069] The preparation method of the wear-resistant and sweat-resistant acrylic coating of the present embodiment 3 is as follows:

[0070] (1) 44 parts of water-based acrylic resin, 18 parts of cardanol-based polyurethane resin, 1.2 parts of adhesion promoter and 15 parts of water are mixed uniformly to obtain a first mixture;

[0071] (2) 3.2 parts of titanate coupling agent 101, 12.9 parts of filler and 1.5 parts of ethanol are mixed uniformly to obtain a second mixture;

[0072] (3) The first mixture and the second mixture are mixed evenly, then 1.0 parts of BYK 7305 rheological agent, 0.6 parts of alkyl polyoxyethylene ether HY-352 and 0.9 parts of dimethyl silicone oil are added and stirred evenly, and finally 1.4 parts of non-ionic polyurethane thickening agent is added and dispersed evenly at a speed of 1500 rpm to obtain a wear-resistant and sweat-resistant acrylic coating.

[0073] The preparation process of the above-mentioned water-based acrylic resin is as follows: 1.6 parts of tri-n-butylborane is added to a proper amount of ethylene glycol butyl ether and dissolved completely, then added to the reaction kettle and heated to 60℃; then 86 parts of acrylic monomer, 1.2 parts of aziridine crosslinking agent and 1.6 parts of tri-n-butylborane are mixed evenly and added to the reaction kettle at a constant speed, which needs to be completed within 3h, and the temperature is increased to 80℃ during the process. After the addition is completed, continue to heat at this temperature for 1.5h, then add 5.4 parts of dithio glycolic acid and 2.4 parts of aziridine crosslinking agent, and the reaction time is controlled within 30min, and the reaction is carried out for 3h; after the reaction is completed, the temperature of the reaction kettle is reduced to 40℃, and ammonia water is added for neutralization while stirring, and the stirring reaction is carried out for 20min, and then cooled to room temperature to obtain the acrylic resin; 100 parts of the prepared acrylic resin, 24 parts of anhydrous ethanol and 32 parts of deionized water are fully stirred to obtain the water-based acrylic resin.

[0074] The components of the above-mentioned acrylic monomer are as follows: 48 parts of methyl methacrylate, 25 parts of tert-butyl methacrylate, 5 parts of acrylamide, 16 parts of pentaerythritol triacrylate and 6 parts of vinyl acrylic acid.

[0075] The preparation process of the above-mentioned cardanol-based polyurethane resin is the same as that in Example 1, and please refer to Example 1 for details.

[0076] The above-mentioned adhesion promoter is composed of triazole silane compound, hyperbranched unsaturated resin Hyper U102 and polyvinylpyrrolidone with a mass ratio of 1.5:2.0:1, that is, the triazole silane compound and polyvinylpyrrolidone are fully mixed and then the hyperbranched unsaturated resin Hyper U102 is added and mixed evenly.

[0077] The above-mentioned filler is composed of titanium white and talc with a mass ratio of 1:1.

[0078] Comparative Example 1

[0079] The components and preparation method of the acrylic coating of the present comparative example are the same as those in Example 3, except that no dithio glycolic acid is added in the preparation process of the water-based acrylic resin in Comparative Example 1.

[0080] Comparative Example 2

[0081] The components and preparation method of the acrylic coating of the present comparative example are the same as in Example 3, except that the acrylic monomers in the present comparative example 2 are composed of methyl methacrylate 48 parts, t-butyl methacrylate 25 parts, acrylamide 5 parts, pentaerythritol tetraacrylate 16 parts and vinyl acrylic 6 parts.

[0082] Comparative Example 3

[0083] The components and preparation method of the acrylic coating of the present comparative example are the same as in Example 3, except that the aziridine crosslinking agent is replaced by trimethylolpropane trimethacrylate in the present comparative example 3.

[0084] Comparative Example 4

[0085] The components and preparation method of the acrylic coating of the present comparative example are the same as in Example 3, except that the cashew phenol-based polyol is replaced by polycaprolactone diol in the present comparative example 4.

[0086] Comparative Example 5

[0087] The components and preparation method of the acrylic coating of the present comparative example are the same as in Example 3, except that the polytetrahydrofuran diol is replaced by ethylenediamine in the present comparative example 5.

[0088] Comparative Example 6

[0089] The components and preparation method of the acrylic coating of the present comparative example are the same as in Example 3, except that the adhesion promoter in the present comparative example 6 is composed of hyperbranched unsaturated resin Hyper U102 and polyvinylpyrrolidone in a mass ratio of 2:1.

[0090] Comparative Example 7

[0091] The components and preparation method of the acrylic coating of the present comparative example are the same as in Example 3, except that the adhesion promoter in the present comparative example 7 is composed of triazole silane compound and polyvinylpyrrolidone in a mass ratio of 1.5:1.

[0092] The acrylic coatings prepared in Examples 1-3 and Comparative Examples 1-7 above are coated on PC substrates, and the properties of the paint films formed are detected, such as adhesion, abrasion resistance, sweat resistance, wet heat resistance, salt spray resistance, etc., and the test results are shown in Table 1 below.

[0093] Adhesion test: tested according to GB / T 9286-1998 "Cross-hatch test for pigmented and clear coatings film";

[0094] Abrasion resistance: tested according to ISO 7784-2:2016 under the conditions of temperature (23±2)℃ and relative humidity (50±5)%, to determine the abrasion resistance (750g / 500r) of the coating;

[0095] Sweat resistance: tested according to EU standard I5012870;

[0096] Wet heat resistance: the sample was treated according to GB / T 2423.50-2012, 85℃, 85%rh, 1000h, double 85 test, then the adhesion and abrasion resistance of the sample were tested;

[0097] Salt spray resistance: tested according to GB / T 1771-2007.

[0098] Table 1: Test results of the acrylic coating

[0099]

[0100] From the test results in Table 1, it can be seen that the acrylic coating of the present application has excellent adhesion, abrasion resistance, sweat resistance, wet heat resistance, salt spray resistance, etc.; the use of the water-based acrylic resin of the present application significantly improves the abrasion resistance and wet heat resistance of the present application; the use of the cardanol-based polyurethane resin of the present application significantly improves the adhesion, sweat resistance, abrasion resistance, wet heat resistance and salt spray resistance of the present application; the use of the adhesion promoter of the present application significantly improves the adhesion, sweat resistance and abrasion resistance of the present application.

[0101] It is worth noting that only one specific component of each component is analyzed in the embodiments of the present application, and in fact other components or models not mentioned in the present application can also be selected.

[0102] The technical features of the above-described embodiments can be combined arbitrarily, and to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0103] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the present patent. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application.

Claims

1. A wear-resistant and sweat-resistant acrylic paint, characterized in that: The invention is composed of the following raw materials in parts by weight: 30-50 parts of water-based acrylic resin, 15-20 parts of cardanol-based polyurethane resin, 0.8-1.5 parts of adhesion promoter, 3-5 parts of titanate coupling agent, 3-15 parts of filler, 0.5-1.8 parts of thickener, 0.5-2.0 parts of leveling agent, 0.5-1.0 parts of wetting agent, 0.5-1.5 parts of defoaming agent, 0.5-2 parts of cosolvent and 5-15 parts of water; The water-based acrylic resin is composed of the following raw materials in parts by weight: 82-90 parts of acrylic monomer, 3-7 parts of dithioglycolic acid, 2-4 parts of tri-n-butylborane and 2-5 parts of aziridine crosslinking agent; The preparation method of the water-based acrylic resin specifically comprises the following steps: S1. First, add 1 / 2 mass of tri-n-butylborane to an appropriate amount of ethylene glycol butyl ether and dissolve it completely. Then add it to the reactor and heat it to 60-70 ° C. S2. According to the formula, the acrylic monomer, 1 / 3 of the mass of the aziridine crosslinker and the remaining tri-n-butylborane were weighed, mixed, and added dropwise to the reactor at a uniform rate within 2-3h. The reaction temperature was controlled at 70-80 ° C. and kept warm for 1-1.5h. Then, dithioglycolic acid and the remaining aziridine crosslinker were added dropwise. The addition time was controlled within 30min and the reaction was allowed to react for 2-3h. The acrylic monomer is composed of the following monomers in parts by weight: 45-55 parts of methyl methacrylate, 20-30 parts of tert-butyl methacrylate, 3-6 parts of acrylamide, 14-18 parts of pentaerythritol triacrylate and 4-6 parts of vinyl acrylic acid; S3. After the reaction, the reactor temperature was lowered to 40 ° C, aqueous ammonia was added while stirring for neutralization, the reaction was stirred for 15-25min, and cooled to room temperature to obtain an acrylic resin; S4. The acrylic resin, anhydrous ethanol and deionized water were thoroughly stirred to obtain an aqueous acrylic resin; wherein the mass of the anhydrous ethanol was 20-25% of the mass of the acrylic resin; the mass of the deionized water was 30-35% of the mass of the acrylic resin; The adhesion promoter is composed of an azole-containing silane compound, a hyperbranched unsaturated resin and polyvinyl pyrrolidone in a mass ratio of (1.2-1.5): (2.0-2.5):

1.

2. The wear-resistant and sweat-resistant acrylic paint according to claim 1, wherein The preparation method of the cardanol-based polyurethane resin specifically comprises the following steps: P1. Add cardanol-based polyol and polypropylene glycol to a container, evacuate at 100-120°C for 1.0-2.0h, then release the vacuum and introduce nitrogen. Cool to 40-50°C, add dibutyltin dilaurate and hexamethylene diisocyanate, and heat to 70-80°C for 1-2h to obtain a prepolymer. P2. Add polytetramethylene glycol to the above prepolymer and continue the reaction at 70-80°C for 3-4 hours. Then cool to 50-60°C and add ammonium hydroxyethyl methacrylate. Keep warm for 2-4 hours until the -NCO content is ≤0.1%. Then cool naturally and evacuate for 5-10 minutes to obtain a cardanol-based polyurethane resin.

3. The wear-resistant and sweat-resistant acrylic paint according to claim 2, characterized in that The mass ratio of hexamethylene diisocyanate and cardanol polyol is (40-60):100; The amount of polypropylene glycol added is 15-30% of the total mass of the hexamethylene diisocyanate and cardanol polyol; The amount of dibutyltin dilaurate added is 0.06-0.10% of the total mass of the hexamethylene diisocyanate and cardanol-based polyol; The amount of polytetramethylene furan diol added is 2.0-2.8% of the total mass of the hexamethylene diisocyanate and cardanol-based polyol; The mass ratio of the ammonium hydroxyethyl methacrylate to the hexamethylene diisocyanate is 1:(0.5-0.65).

4. The wear-resistant and sweat-resistant acrylic paint according to claim 2, wherein The cardanol-based polyol has a hydroxyl value of 175 mg KOH / g and a functionality of 3.

8.

5. The wear-resistant and sweat-resistant acrylic paint according to claim 1, characterized in that The azole-containing silane compound is a triazole silane compound.

6. A method for preparing a wear-resistant and sweat-resistant acrylic paint according to any one of claims 1 to 5, characterized in that: The specific steps include: (1) uniformly mixing a water-based acrylic resin, a cardanol-based polyurethane resin, an adhesion promoter, and water to obtain a first mixture; (2) uniformly mixing the titanate coupling agent, the filler, and the cosolvent to obtain a second mixture; (3) The first mixture and the second mixture are mixed evenly, and then a leveling agent, a wetting agent and a defoaming agent are added and stirred evenly. Finally, a thickener is added and dispersed evenly at a rate of 1200-1500 rpm to obtain the acrylic paint.

7. Use of the wear-resistant and sweat-resistant acrylic paint according to any one of claims 1 to 5 in 3C products and glasses industry.

Images