Aerosol type temporary protective paint and preparation method thereof

Abstract

The invention belongs to the technical field of coatings, and particularly relates to aerosol type temporary protective paint and a preparation method thereof. Comprising the following raw materials in parts by mass: 5-15 parts of water-based resin; 20-40 parts of an alcohol ether solvent; 5 to 10 parts of deionized water; 1-10 parts of pigment and filler; 0.01 to 0.5 part of a defoaming agent; 0.01 to 0.5 part of a wetting dispersant; and 40-50 parts of a propellant. The aerosol type temporary protective paint provided by the invention not only can smoothly spray paint mist after being stored at 50 DEG C for 90 days, but also has washable film stripping property, and a paint film has excellent scratch resistance.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, specifically relating to an aerosol-type temporary protective paint and its preparation method. Background Technology

[0002] Glass and plastic products are widely used in modern life, but they are easily damaged and contaminated during processing. Applying temporary protective paint by brushing or spraying can protect glass and plastic products from physical damage or other contamination during production, processing, transportation, or storage, and is an important protective measure for glass and plastic products.

[0003] Currently, temporary protective coatings mainly face two problems. One is how to achieve rapid film removal and improve efficiency. Existing technologies primarily use acid or alkaline solutions or high-temperature water for film removal. For example, Chinese patent CN119505685A discloses a temporary protective LED curing coating for glass and its preparation method, which is made from anhydride-modified polyurethane multifunctional acrylate, polyethylene glycol di(meth)acrylate, acryloylmorpholine, dimethacrylamide, phosphate methacrylate, silane coupling agent, photoinitiator, leveling agent, etc. This technical solution achieves complete film removal by immersion in 5% NaOH at 60℃ for less than 1 minute. However, the film dissolves in the washing solution during removal, resulting in high costs for the removal process and washing solution. Furthermore, the alkaline solution is corrosive. Chinese patent CN105038401A discloses a washable temporary protective ink for touchscreens, its preparation method, and its application. By weight percentage, its raw material composition is: 0-50% polyacrylic acid resin solution, 5%-90% water-based coating resin, 5%-50% water-soluble polymer solution, 0-70% polyacrylate emulsion, 1%-10% filler, 0.1%-2% pigment, and 2%-5% functional additives. The polyacrylic acid resin solution and polyacrylate emulsion are not both 0%. This technical solution involves soaking in 50℃ water for 30 seconds to 2 minutes, resulting in blocky flaking. Although it avoids using corrosive solutions, it still requires heating water, leading to high energy consumption. Furthermore, some temporary protective coatings contain volatile, toxic, and harmful solvents, posing certain hazards to human health and the environment.

[0004] On the other hand, it is urgent to improve the protective performance of temporary protective coatings, especially their scratch resistance. Therefore, it is imperative to develop a temporary protective coating that is easy to remove, removes film thoroughly, is low in cost, environmentally friendly, and has excellent protective performance. Summary of the Invention

[0005] In view of this, one object of the present invention is to provide an aerosol-type temporary protective paint containing water-based resin; alcohol ether solvent; deionized water; pigments and fillers; defoamer; wetting and dispersing agent; propellant, etc., which not only enables the aerosol-type temporary protective paint to be successfully sprayed out as aerosol after being stored at 50°C for 90 days and has washable film removal properties, but also the paint film has excellent scratch resistance.

[0006] Another object of the present invention is to provide a method for preparing an aerosol-type temporary protective coating.

[0007] To achieve the above objectives, a first aspect of the present invention provides an aerosol-type temporary protective coating comprising the following raw materials in parts by weight: 5-15 parts of water-based resin; 20-40 parts of alcohol ether solvent; 5-10 parts of deionized water; 1-10 parts of pigments and fillers; 0.01-0.5 parts of defoamer; 0.01-0.5 parts of wetting and dispersing agent; and 40-50 parts of propellant.

[0008] In some preferred embodiments, the pH of the aqueous resin is 6.5-9.

[0009] Further, the waterborne resin includes a water-soluble acrylic resin with a solid content of 45-55%, a viscosity of 3000-6000 mPa·s, and a temperature of 25°C; a water-soluble aliphatic polyurethane acrylic copolymer with a solid content of 30-40%, a viscosity of 20-200 mPa·s, and a temperature of 25°C; and a water-soluble organosilicon-modified acrylic resin with a solid content of 50-60%, a viscosity of 5000-6000 mPa·s, and a temperature of 25°C.

[0010] Furthermore, the mass ratio of the water-soluble acrylic resin, the water-soluble aliphatic polyurethane acrylic copolymer, and the water-soluble organosilicon-modified acrylic resin is 4-6:2-4:1-2.

[0011] Furthermore, the water-soluble acrylic resin has a pH of 7-9, the water-soluble aliphatic polyurethane acrylic copolymer has a pH of 6.5-8, and the water-soluble organosilicon-modified acrylic resin has a pH of 7-9.

[0012] This invention aims to provide an aerosol-type temporary protective paint that can be washed away and has a protective effect. The water-based resin must not only be washable and removable, but also have good compatibility with pigments, fillers, and propellants, and be able to smoothly spray paint mist during use. During the experiment, the inventors tried various water-based resins and unexpectedly discovered that using a combination of water-based resins with a pH of 6.5-9, including a water-soluble acrylic resin with a solid content of 45-55% and a viscosity of 3000-6000 mPa·s at 25°C, a water-soluble aliphatic polyurethane acrylic copolymer with a solid content of 30-40% and a viscosity of 20-200 mPa·s at 25°C, and a water-soluble organosilicon-modified acrylic resin with a solid content of 50-60% and a viscosity of 5000-6000 mPa·s at 25°C, not only achieves washable and removable properties in the aerosol-type temporary protective paint, but also provides excellent scratch resistance and allows for smooth spraying of paint mist after heat storage testing. During the experiment, the inventors also discovered that the mass ratio of water-soluble acrylic resin, water-soluble aliphatic polyurethane acrylic copolymer, and water-soluble organosilicon-modified acrylic resin needs to be controlled at 4-6:2-4:1-2. Otherwise, the aerosol temporary protective paint will not be effectively washed off with water and will not be able to spray paint mist smoothly after heat storage. This may be because when the mass ratio is unbalanced, on the one hand, the adhesion of the paint film formed by the combined action of the three is large and the water solubility of the paint film is poor, resulting in the inability to effectively wash off with water. On the other hand, the compatibility of the resin system with pigments, fillers, and propellants is poor, resulting in the inability to spray paint mist smoothly.

[0013] In some preferred embodiments, the alcohol ether solvent is selected from at least one of ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, propylene glycol methyl ether, propylene glycol monoethyl ether, propylene glycol n-propyl ether, propylene glycol n-butyl ether, dipropylene glycol n-propyl ether, dipropylene glycol n-butyl ether, and tripropylene glycol n-butyl ether.

[0014] Preferably, the alcohol ether solvent is a mixture of ethylene glycol monobutyl ether and propylene glycol methyl ether.

[0015] More preferably, the mass ratio of ethylene glycol monobutyl ether to propylene glycol methyl ether is 1-2:1-2.

[0016] In some preferred embodiments, the pigment and filler are a mixture of pigment and filler in a mass ratio of 1:1-3.

[0017] Preferably, the pigment is selected from at least one of titanium dioxide, carbon black, iron oxide red, and phthalocyanine blue.

[0018] Preferably, the filler is selected from at least one of talc, silica and calcium carbonate.

[0019] In some preferred embodiments, the defoamer is selected from at least one of silicone defoamers and polyether-modified silicone defoamers.

[0020] In some preferred embodiments, the wetting and dispersing agent is a mixture of organosilicon-polyether co-modified polyacrylate and styrene-maleic anhydride derivative.

[0021] Preferably, the mass ratio of the organosilicon and polyether co-modified polyacrylate to the styrene maleic anhydride derivative is 3-6:1.

[0022] Preferably, the styrene-maleic anhydride derivative is a comb-type block polymer.

[0023] The temporary protective paint of this invention differs from existing temporary protective paints in that it is an aerosol type. Compared to brush- or spray-applied temporary protective paints, it suffers from the miscibility issue of water-based resins, pigments, fillers, propellants, deionized water, and alcohol ether solvents. Otherwise, the stability and spraying stability of the temporary protective paint will be affected. During the experiment, the inventors discovered that using conventional wetting and dispersing agents, such as polyether siloxane copolymers, could not ensure that the aerosol-type temporary protective paint maintained good stability and spraying stability after heat storage. Unexpectedly, it was found that when the wetting and dispersing agent is a mixture of organosilicon-polyether co-modified polyacrylate and styrene-maleic anhydride derivatives, the above problems can be solved. Furthermore, the inventors discovered that the composition of the styrene maleic anhydride derivative significantly affects the stability and spray stability of the aerosol temporary protective coating after heat storage. The effect is only good when the styrene maleic anhydride derivative is a comb-type block polymer. This may be because, on the one hand, the structure of the styrene maleic anhydride derivative of the comb-type block polymer is more conducive to the dispersion of pigments and fillers, and on the other hand, its pH of 8-9 has better compatibility with the pH of the aqueous resin system in this invention, thereby improving the good compatibility of the aqueous resin, pigments, fillers, propellant, deionized water and alcohol ether solvent after heat storage.

[0024] In some preferred embodiments, the propellant is selected from at least one of carbon dioxide, nitrogen, liquefied petroleum gas and dimethyl ether.

[0025] A second aspect of the present invention provides a method for preparing an aerosol-type temporary protective coating, comprising the following steps:

[0026] S1. Mix the water-based resin, deionized water, alcohol ether solvent and wetting and dispersing agent, stir, add pigments and fillers, continue stirring, add defoamer, continue stirring, and obtain the liquid.

[0027] S2. Fill the aerosol can with the liquid material and propellant to obtain the final product.

[0028] Preferably, the stirring speed in step S1 is 600-800 r / min.

[0029] Preferably, step S1 specifically involves: mixing aqueous resin, deionized water, alcohol ether solvent and wetting and dispersing agent, stirring at 600-800 r / min, adding pigments and fillers, continuing to stir for 1-2 h, adding defoamer, and continuing to stir for 10-30 min to obtain the liquid.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. This invention uses a water-based resin with a pH of 6.5-9, comprising a water-soluble acrylic resin with a solid content of 45-55%, a viscosity of 3000-6000 mPa·s, and a temperature of 25°C; a water-soluble aliphatic polyurethane acrylic copolymer with a solid content of 30-40%, a viscosity of 20-200 mPa·s, and a temperature of 25°C; and a water-soluble organosilicon-modified acrylic resin with a solid content of 50-60%, a viscosity of 5000-6000 mPa·s, and a temperature of 25°C. This compounding not only enables the aerosol temporary protective paint to be smoothly sprayed out during use and has washable film removal properties, but also provides the paint film with excellent scratch resistance.

[0032] 2. The present invention controls the mass ratio of water-soluble acrylic resin, water-soluble aliphatic polyurethane acrylic copolymer and water-soluble organosilicon modified acrylic resin to 4-6:2-4:1-2, which avoids the situation that aerosol temporary protective paint cannot be effectively washed off with water and cannot be sprayed smoothly after heat storage.

[0033] 3. The present invention uses a combination of organosilicon-polyether co-modified polyacrylate and comb-type block polymer styrene maleic anhydride derivatives, which makes the aerosol temporary protective paint still have good stability and spraying stability after heat storage.

[0034] 4. The aerosol-type temporary protective paint provided by this invention also has the characteristics of low cost and environmental friendliness. Attached Figure Description

[0035] Figure 1 This is a physical image of the washable and removable aerosol-type temporary protective paint according to Embodiment 2 of the present invention;

[0036] Figure 2 The scratch resistance test results of the aerosol temporary protective paint in Example 2 of this invention;

[0037] Figure 3 The scratch resistance test results of the aerosol temporary protective paint in Example 5 of this invention;

[0038] Figure 4The scratch resistance test results are for the aerosol-type temporary protective paint of Comparative Example 2 of this invention. Detailed Implementation

[0039] To enable those skilled in the art to more clearly understand the technical solutions described in this invention, the following embodiments are provided for illustration. It should be noted that the following embodiments do not constitute a limitation on the scope of protection claimed by this invention.

[0040] Unless otherwise specified, the raw materials, reagents or apparatus used in the following examples and comparative examples are available from conventional commercial sources or can be obtained by existing known methods.

[0041] Table 1 contains information on some of the raw materials used in the following examples and comparative examples:

[0042] Table 1

[0043]

[0044] Example 1

[0045] An aerosol-type temporary protective coating is composed of the following raw materials in parts by weight: 5 parts water-based resin; 20 parts alcohol ether solvent; 5 parts deionized water; 4 parts pigments and fillers; 0.1 parts defoamer; 0.2 parts wetting and dispersing agent; and 40 parts propellant.

[0046] The waterborne resin is a mixture of water-soluble acrylic resin, water-soluble aliphatic polyurethane acrylic copolymer and water-soluble organosilicon modified acrylic resin A in a mass ratio of 4:4:2.

[0047] The water-soluble acrylic resin has a solid content of 50±2%, a viscosity of 3000-6000 mpa.s, a temperature of 25℃, and a pH of 7-9.

[0048] The water-soluble aliphatic polyurethane acrylic copolymer has a solid content of 35±2%, a viscosity of 20-200 mPa·s, a temperature of 25℃, and a pH of 6.5-8.

[0049] The water-soluble organosilicon-modified acrylic resin A has a solid content of 55±2%, a viscosity of 5000-6000 mpa.s, a temperature of 25℃, and a pH of 7-9.

[0050] The alcohol ether solvent is a mixture of ethylene glycol monobutyl ether and propylene glycol methyl ether in a mass ratio of 1:1.

[0051] The pigment and filler are a mixture of pigment and filler in a mass ratio of 1:2.

[0052] The pigment is titanium dioxide.

[0053] The filler is calcium carbonate.

[0054] The defoamer is an organosilicone defoamer.

[0055] The wetting and dispersing agent is a mixture of organosilicon-polyether co-modified polyacrylate and styrene-maleic anhydride derivative A in a mass ratio of 4:1.

[0056] The styrene-maleic anhydride derivative A is a comb-type block polymer.

[0057] The propellant is dimethyl ether.

[0058] The preparation method of the above-mentioned aerosol temporary protective paint is as follows:

[0059] S1. Mix the aqueous resin, deionized water, alcohol ether solvent, and wetting and dispersing agent, stir at 700 r / min, add pigments and fillers, continue stirring for 1 hour, add defoamer, and continue stirring for 30 minutes to obtain the liquid.

[0060] S2. Fill the aerosol can with the liquid material and propellant to obtain the final product.

[0061] Example 2

[0062] An aerosol-type temporary protective coating is composed of the following raw materials in parts by weight: 10 parts water-based resin; 30 parts alcohol ether solvent; 8 parts deionized water; 7 parts pigments and fillers; 0.2 parts defoamer; 0.3 parts wetting and dispersing agent; and 45 parts propellant.

[0063] The waterborne resin is a mixture of water-soluble acrylic resin, water-soluble aliphatic polyurethane acrylic copolymer and water-soluble organosilicon modified acrylic resin A in a mass ratio of 5:4:1.

[0064] The water-soluble acrylic resin has a solid content of 50±2%, a viscosity of 3000-6000 mpa.s, a temperature of 25℃, and a pH of 7-9.

[0065] The water-soluble aliphatic polyurethane acrylic copolymer has a solid content of 35±2%, a viscosity of 20-200 mPa·s, a temperature of 25℃, and a pH of 6.5-8.

[0066] The water-soluble organosilicon-modified acrylic resin A has a solid content of 55±2%, a viscosity of 5000-6000 mpa.s, a temperature of 25℃, and a pH of 7-9.

[0067] The alcohol ether solvent is a mixture of ethylene glycol monobutyl ether and propylene glycol methyl ether in a mass ratio of 1:1.

[0068] The pigment and filler are a mixture of pigment and filler in a mass ratio of 1:2.

[0069] The pigment is titanium dioxide.

[0070] The filler is calcium carbonate.

[0071] The defoamer is an organosilicone defoamer.

[0072] The wetting and dispersing agent is a mixture of organosilicon-polyether co-modified polyacrylate and styrene-maleic anhydride derivative A in a mass ratio of 4:1.

[0073] The styrene-maleic anhydride derivative A is a comb-type block polymer.

[0074] The propellant is dimethyl ether.

[0075] The preparation method of the above-mentioned aerosol temporary protective paint is as follows:

[0076] S1. Mix the aqueous resin, deionized water, alcohol ether solvent, and wetting and dispersing agent, stir at 700 r / min, add pigments and fillers, continue stirring for 1 hour, add defoamer, and continue stirring for 30 minutes to obtain the liquid.

[0077] S2. Fill the aerosol can with the liquid material and propellant to obtain the final product.

[0078] Example 3

[0079] An aerosol-type temporary protective coating is composed of the following raw materials in parts by weight: 10 parts water-based resin; 30 parts alcohol ether solvent; 8 parts deionized water; 7 parts pigments and fillers; 0.2 parts defoamer; 0.3 parts wetting and dispersing agent; and 45 parts propellant.

[0080] The waterborne resin is a mixture of water-soluble acrylic resin, water-soluble aliphatic polyurethane acrylic copolymer and water-soluble organosilicon modified acrylic resin A in a mass ratio of 6:3:1.

[0081] The water-soluble acrylic resin has a solid content of 50±2%, a viscosity of 3000-6000 mpa.s, a temperature of 25℃, and a pH of 7-9.

[0082] The water-soluble aliphatic polyurethane acrylic copolymer has a solid content of 35±2%, a viscosity of 20-200 mPa·s, a temperature of 25℃, and a pH of 6.5-8.

[0083] The water-soluble organosilicon-modified acrylic resin A has a solid content of 55±2%, a viscosity of 5000-6000 mpa.s, a temperature of 25℃, and a pH of 7-9.

[0084] The alcohol ether solvent is a mixture of ethylene glycol monobutyl ether and propylene glycol methyl ether in a mass ratio of 1:1.

[0085] The pigment and filler are a mixture of pigment and filler in a mass ratio of 1:2.

[0086] The pigment is titanium dioxide.

[0087] The filler is calcium carbonate.

[0088] The defoamer is an organosilicone defoamer.

[0089] The wetting and dispersing agent is a mixture of organosilicon-polyether co-modified polyacrylate and styrene-maleic anhydride derivative A in a mass ratio of 4:1.

[0090] The styrene-maleic anhydride derivative A is a comb-type block polymer.

[0091] The propellant is dimethyl ether.

[0092] The preparation method of the above-mentioned aerosol temporary protective paint is as follows:

[0093] S1. Mix the aqueous resin, deionized water, alcohol ether solvent, and wetting and dispersing agent, stir at 700 r / min, add pigments and fillers, continue stirring for 1 hour, add defoamer, and continue stirring for 30 minutes to obtain the liquid.

[0094] S2. Fill the aerosol can with the liquid material and propellant to obtain the final product.

[0095] Example 4

[0096] The only difference from Example 2 is that the waterborne resin is a mixture of water-soluble acrylic resin, water-soluble aliphatic polyurethane acrylic copolymer and water-soluble organosilicon modified acrylic resin A in a mass ratio of 3:2:5; all other aspects are the same.

[0097] Example 5

[0098] The only difference from Example 2 is that the waterborne resin is a mixture of water-soluble acrylic resin, water-soluble aliphatic polyurethane acrylic copolymer and water-soluble organosilicon modified acrylic resin A in a mass ratio of 7:1:2; all other aspects are the same.

[0099] Comparative Example 1

[0100] The only difference from Example 2 is that the water-soluble acrylic resin is replaced with a water-based modified acrylic polymer with a viscosity of 1000-4000 mPa·s, a temperature of 25°C, and a pH of 5-7; all other aspects are the same.

[0101] Comparative Example 2

[0102] The only difference from Example 2 is that the water-soluble organosilicon-modified acrylic resin A is replaced with water-soluble organosilicon-modified acrylic resin B, which has a solid content of 45±2%, a viscosity of 3000-4500 mpa.s, a temperature of 25°C, and a pH of 7-9; all other aspects are the same.

[0103] Comparative Example 3

[0104] The only difference from Example 2 is that the wetting and dispersing agent is a polyether siloxane copolymer; all other aspects are the same.

[0105] Comparative Example 4

[0106] The only difference from Example 2 is that the styrene maleic anhydride derivative A is replaced with a polyether siloxane copolymer; all other aspects are the same.

[0107] Comparative Example 5

[0108] The only difference from Example 2 is that styrene maleic anhydride derivative A is replaced with styrene maleic anhydride derivative B, which is a hydrophobic phenyl-modified polycarboxylate ammonium salt; all other aspects are the same.

[0109] Comparative Example 6

[0110] The only difference from Example 2 is that styrene maleic anhydride derivative A is replaced with styrene maleic anhydride derivative C, which is a bio-based polyoxyethylene ether polymer; all other aspects are the same.

[0111] Comparative Example 7

[0112] The only difference from Example 2 is that the styrene-maleic anhydride derivative A is replaced with a styrene-maleic anhydride copolymer solution; all other aspects are the same.

[0113] Performance Test 1:

[0114] (1) Washable film removal properties:

[0115] The aerosol temporary protective paints prepared in Examples 1-5 and Comparative Examples 1-2 were uniformly sprayed onto PC samples to form a 10µm paint film. After baking at 50°C for 30 minutes, the paint film was rinsed with water at 25°C and the dissolution of the paint film was observed.

[0116] (2) Scratch resistance

[0117] The aerosol temporary protective paints prepared in Examples 1-5 and Comparative Examples 1-2 were uniformly sprayed onto PC samples to form a 10µm coating. After baking at 50°C for 30 minutes, a 2N load force was applied to the surface of the paint film and scraped 100 times. The surface of the paint film was then observed for scratches.

[0118] The results of performance test 1 are shown in Table 2.

[0119] Table 2

[0120]

[0121] As can be seen from Table 2:

[0122] Compared with Example 2, in Example 4, when the mass ratio of water-soluble acrylic resin, water-soluble aliphatic polyurethane acrylic copolymer and water-soluble organosilicon modified acrylic resin is not in the range of 4-6:2-4:1-2, although the paint film has good scratch resistance, it can only be removed by washing with 50°C warm water.

[0123] Compared with Example 2, in Example 5, when the mass ratio of water-soluble acrylic resin, water-soluble aliphatic polyurethane acrylic copolymer and water-soluble organosilicon modified acrylic resin is not in the range of 4-6:2-4:1-2, the paint film can be removed by washing with water at 25°C, but the scratch resistance is poor.

[0124] Compared with Example 2, Comparative Example 2 replaced the water-soluble acrylic resin with a water-modified acrylic polymer. Although the paint film could be removed by washing with water at 25°C, its scratch resistance was poor.

[0125] Performance Test 2

[0126] (1) The aerosol temporary protective paints prepared in Examples 1-5, Comparative Example 1, and Comparative Example 3-7 were placed at 50±2℃ for 90 days, and the cans were opened to observe whether precipitation and stratification occurred.

[0127] (2) The aerosol temporary protective paints prepared in Examples 1-5, Comparative Example 1, and Comparative Example 3-7 were placed at 50±2℃ for 90 days, shaken evenly left and right three times, and the spraying was observed to see if there was any clogging or spraying of particles.

[0128] The results of performance test 2 are shown in Table 3.

[0129] Table 3

[0130]

[0131] As can be seen from Table 3:

[0132] Compared with Example 2, in Examples 4 and 5, when the mass ratio of water-soluble acrylic resin, water-soluble aliphatic polyurethane acrylic copolymer and water-soluble organosilicon modified acrylic resin was not in the range of 4-6:2-4:1-2, the resulting aerosol temporary protective paint did not show precipitation, but it did show spraying particles. This may be because the aerosol temporary protective paint showed coarsening due to the poor compatibility of the system.

[0133] Compared with Example 2, Comparative Example 1 replaced the water-soluble acrylic resin with a water-based modified acrylic polymer. The resulting aerosol temporary protective paint showed precipitation. Even after shaking it three times, particles were still sprayed out. This may be because the aerosol temporary protective paint showed coarsening due to poor system compatibility. The inventors later found that the pH of the water-washed modified acrylic polymer used in Comparative Example 1 was 5-7, which had poor compatibility with the wetting and dispersing agent of the present invention.

[0134] Compared with Example 2, Comparative Example 3 uses a polyether siloxane copolymer as the wetting and dispersing agent. The resulting aerosol temporary protective paint exhibits precipitation and clogging after being shaken three times.

[0135] Compared with Example 2, in Comparative Example 4, when the styrene maleic anhydride derivative A was replaced with a polyether siloxane copolymer, the resulting aerosol temporary protective paint showed precipitation, and after shaking it left and right three times, it showed the phenomenon of spraying particles.

[0136] Compared with Example 2, in Comparative Example 5, styrene maleic anhydride derivative A was replaced with styrene maleic anhydride derivative B, which is a hydrophobic phenyl modified polycarboxylate ammonium salt. The resulting aerosol temporary protective paint showed precipitation and blockage after being shaken three times.

[0137] Compared with Example 2, in Comparative Example 6, styrene maleic anhydride derivative A was replaced with styrene maleic anhydride derivative C, which is a bio-based polyoxyethylene ether polymer. Although no precipitation occurred in the resulting aerosol temporary protective paint, it became clogged after being shaken three times. This may be due to the poor compatibility of the system, resulting in a coarsening phenomenon.

[0138] Compared with Example 2, in Comparative Example 7, when styrene maleic anhydride derivative A was replaced with styrene maleic anhydride copolymer solution, the resulting aerosol temporary protective paint showed precipitation, and after shaking it left and right three times, it showed the phenomenon of spraying particles.

[0139] Comparative Examples 3-7 show that conventional wetting and dispersing agents cannot effectively stabilize the aerosol-type temporary protective coating of the present invention.

[0140] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. An aerosol-type temporary protective paint, characterized in that, The raw materials include the following parts by weight: 5-15 parts water-based resin; 20-40 parts alcohol ether solvent; 5-10 parts deionized water; 1-10 parts pigments and fillers; 0.01-0.5 parts defoamer; 0.01-0.5 parts wetting and dispersing agent; and 40-50 parts propellant. The pH of the aqueous resin is 6.5-9; The waterborne resin includes a water-soluble acrylic resin with a solid content of 45-55% and a viscosity of 3000-6000 mPa·s, a water-soluble aliphatic polyurethane acrylic copolymer with a solid content of 30-40% and a viscosity of 20-200 mPa·s, and a water-soluble organosilicon-modified acrylic resin with a solid content of 50-60% and a viscosity of 5000-6000 mPa·s.

2. The aerosol-type temporary protective paint according to claim 1, characterized in that, The mass ratio of the water-soluble acrylic resin, the water-soluble aliphatic polyurethane acrylic copolymer, and the water-soluble organosilicon-modified acrylic resin is 4-6:2-4:1-2.

3. The aerosol-type temporary protective paint according to claim 2, characterized in that, The alcohol ether solvent is selected from at least one of ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, propylene glycol methyl ether, propylene glycol monoethyl ether, propylene glycol n-propyl ether, propylene glycol n-butyl ether, dipropylene glycol n-propyl ether, dipropylene glycol n-butyl ether, and tripropylene glycol n-butyl ether.

4. The aerosol-type temporary protective paint according to claim 3, characterized in that, The pigment and filler are a mixture of pigment and filler in a mass ratio of 1:1-3; the pigment is selected from at least one of titanium dioxide, carbon black, iron oxide red and phthalocyanine blue; the filler is selected from at least one of talc, silicon dioxide and calcium carbonate.

5. The aerosol-type temporary protective paint according to claim 4, characterized in that, The defoamer is selected from at least one of silicone defoamers and polyether-modified silicone defoamers.

6. The aerosol-type temporary protective paint according to claim 5, characterized in that, The wetting and dispersing agent is a mixture of organosilicon-polyether co-modified polyacrylate and styrene-maleic anhydride derivative.

7. The aerosol-type temporary protective paint according to claim 6, characterized in that, The mass ratio of the organosilicon and polyether co-modified polyacrylate and styrene maleic anhydride derivative is 3-6:

1.

8. The aerosol-type temporary protective paint according to claim 7, characterized in that, The styrene-maleic anhydride derivative is a comb-type block polymer.

9. The aerosol-type temporary protective paint according to claim 1, characterized in that, The propellant is selected from at least one of carbon dioxide, nitrogen, liquefied petroleum gas and dimethyl ether.

10. The method for preparing the aerosol-type temporary protective paint according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Mix the water-based resin, deionized water, alcohol ether solvent and wetting and dispersing agent, stir, add pigments and fillers, continue stirring, add defoamer, continue stirring, and obtain the liquid. S2. Fill the aerosol can with the liquid material and propellant to obtain the final product.

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