A flexible acrylic resin and its application on a camouflage tarpaulin

Abstract

The present invention relates to the technical field of coatings, and provides a flexible acrylic resin and its application on a camouflage tarpaulin. The flexible acrylic resin comprises the following components in parts by mass: 30-40 parts of methyl methacrylate, 10-20 parts of methacrylic acid, 25-35 parts of butyl acrylate, 10-20 parts of 2,2-dimethyl-3-(3-methylidenepent-4-enyl)oxirane, 1.5-2.5 parts of styrene, 0.05-0.1 part of initiator, 20-40 parts of solvent, and 2.5-3.5 parts of elastic powder. Through the above technical solution, the problem of poor compatibility between inorganic nanoparticles and coating substrates in the related art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and specifically, to a flexible acrylic resin and its application on a camouflage tarpaulin. Background Art

[0002] Currently, the camouflage fabrics for automobile covers, hoods, etc. usually adopt the printing method. However, the printing process is restricted by factors such as the length of the printing table and the number of color sets, resulting in that the printing cycle is generally difficult to exceed 6m, and the pattern flexibility is poor. In addition, the outermost PVC protective film of the automobile is a hot-melt film, and it can only be post-coated with a protective layer after transfer printing, and the weather resistance of this process is generally average. In recent years, the spraying method has been widely pursued due to its simple operation and high matching with the vehicle body.

[0003] The existing camouflage coatings for spraying generally have the defects of low hardness, poor adhesion, and poor abrasion resistance, which greatly affect the quality of the coating. Hardness and adhesion are important parameters for measuring the abrasion resistance of the paint film. The paint film with high hardness and good adhesion is not easy to be scratched, showing good abrasion resistance. In order to improve the abrasion resistance, high-hardness inorganic nanoparticles, such as silica, are often added to the coating. However, the inorganic nanoparticles are extremely easy to agglomerate and have poor dispersibility, seriously affecting the compatibility with the coating substrate, resulting in uneven dispersion of the two, and further affecting the paint film effect. Therefore, improving the compatibility between inorganic nanoparticles and the coating substrate is a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0004] The present invention provides a flexible acrylic resin and its application on a camouflage tarpaulin, which solves the problem of poor compatibility between inorganic nanoparticles and the coating substrate in the related art.

[0005] The technical solution of the present invention is as follows:

[0006] A flexible acrylic resin, comprising the following components in parts by mass: 30-40 parts of methyl methacrylate, 10-20 parts of methacrylic acid, 25-35 parts of butyl acrylate, 10-20 parts of 2,2-dimethyl-3-(3-methylenepent-4-enyl)oxirane, 1.5-2.5 parts of styrene, 0.05-0.1 part of initiator, 20-40 parts of solvent, and 2.5-3.5 parts of elastic powder.

[0007] As a further technical solution, the initiator includes one or more of benzoyl peroxide, azobisisobutyronitrile, and ammonium persulfate.

[0008] As a further technical solution, the solvent includes xylene and butyl acetate.

[0009] As a further technical solution, the mass ratio of xylene to butyl acetate is 1:1.

[0010] A preparation method of a flexible acrylic resin, which comprises mixing methyl methacrylate, methacrylic acid, butyl acrylate, 2,2-dimethyl-3-(3-methylenepent-4-enyl)oxirane, styrene, a solvent and an initiator, adding elastic powder after reaction, and continuing the reaction to obtain the flexible acrylic resin.

[0011] As a further technical solution, the reaction temperature is independently 100-120°C, and the reaction time is independently 30-40 min.

[0012] A coating, comprising component A and component B in the following parts by mass. Component A includes: 50-60 parts of a flexible acrylic resin or the flexible acrylic resin obtained by the preparation method, 0.3-0.8 part of a dispersant, 0.3-0.8 part of a leveling agent, 0.3-0.8 part of an antifoaming agent, 10-25 parts of a solvent, 10-20 parts of a filler, and 10-20 parts of a pigment. Component B includes: 40-60 parts of a curing agent, 40-60 parts of a solvent, and 0.4-0.6 part of a drier.

[0013] As a further technical solution, the mass ratio of 2,2-dimethyl-3-(3-methylenepent-4-enyl)oxirane to the filler is 1:1.

[0014] A preparation method of a coating, comprising the following steps:

[0015] S1. Mix the flexible acrylic resin, the dispersant, the leveling agent, the antifoaming agent, the solvent, the filler and the pigment to obtain component A;

[0016] S2. Mix the curing agent, the solvent and the drier to obtain component B;

[0017] S3. When in use, mix component A and component B, and dilute to obtain the coating.

[0018] As a further technical solution, the diluent used in the dilution in S3 includes one or two of xylene and butyl acetate.

[0019] As a further technical solution, the dosage of the diluent is 100-150 parts.

[0020] As a further technical solution, the dispersant is methacrylic acid;

[0021] The leveling agent includes one or several of leveling agent BYK333 and leveling agent BYK3550;

[0022] The antifoaming agent includes one or several of antifoaming agent BYK-141 and antifoaming agent BYK-054;

[0023] The solvents in the component A include xylene and butyl acetate with a mass ratio of 1:1;

[0024] The filler includes one or more of silica and talcum powder;

[0025] The curing agent is isocyanate;

[0026] The solvent in the component B is butyl acetate;

[0027] The drier includes one or more of dibutyltin dilaurate and stannous octoate.

[0028] An application of a coating on a camouflage tarpaulin.

[0029] The working principle and beneficial effects of the present invention are as follows:

[0030] 1. By adding 2,2-dimethyl-3-(3-methylidenepent-4-enyl)oxirane to the reaction monomers, the present invention synthesizes a flexible acrylic resin. When the synthesized flexible acrylic resin is applied to the coating, it can improve the compatibility between inorganic nanoparticles and the coating substrate, thereby improving the hardness, adhesion and abrasion resistance of the paint film.

[0031] 2. The present invention controls the mass ratio of 2,2-dimethyl-3-(3-methylidenepent-4-enyl)oxirane to the filler within the range of 1:1, further improving the compatibility between inorganic nanoparticles and the coating substrate, and achieving the effects of improving the hardness, adhesion and abrasion resistance of the paint film. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of the present invention.

[0033] Example 1

[0034] S1. Prepare acrylic resin: Add 15 parts of xylene and 15 parts of butyl acetate to the reaction kettle, stir evenly, heat up to 110 °C, add 35 parts of methyl methacrylate, 15 parts of methacrylic acid, 30 parts of butyl acrylate, 15 parts of 2,2-dimethyl-3-(3-methylidenepent-4-enyl)oxirane, 2 parts of styrene, and 0.05 part of dibenzoyl peroxide, react for 30 min, add 3 parts of RHU-5070D, and continue to react for 30 min to obtain acrylic resin;

[0035] S2. Mix 55 parts of the obtained acrylic resin, 0.5 part of methacrylic acid, 0.5 part of leveling agent BYK333, 0.5 part of defoaming agent BYK-141, 10 parts of xylene, 10 parts of butyl acetate, 15 parts of silicon dioxide, and 15 parts of pigment to obtain Component A; mix 50 parts of isocyanate, 50 parts of butyl acetate, and 0.5 part of dibutyltin dilaurate to obtain Component B.

[0036] S3. Mix Component A and Component B evenly, and add 120 parts of xylene to obtain the coating.

[0037] Example 2

[0038] S1. Prepare acrylic resin: Add 15 parts of xylene and 15 parts of butyl acetate to the reaction kettle, stir evenly, heat up to 110°C, add 35 parts of methyl methacrylate, 15 parts of methacrylic acid, 30 parts of butyl acrylate, 10 parts of 2,2-dimethyl-3-(3-methylenepent-4-enyl)oxirane, 2 parts of styrene, and 0.05 part of dibenzoyl peroxide, react for 30 min, add 3 parts of RHU-5070D, and continue to react for 30 min to obtain the acrylic resin.

[0039] S2. Mix 55 parts of the obtained acrylic resin, 0.5 part of methacrylic acid, 0.5 part of leveling agent BYK333, 0.5 part of defoaming agent BYK-141, 10 parts of xylene, 10 parts of butyl acetate, 15 parts of silicon dioxide, and 15 parts of pigment to obtain Component A; mix 50 parts of isocyanate, 50 parts of butyl acetate, and 0.5 part of dibutyltin dilaurate to obtain Component B.

[0040] S3. Mix Component A and Component B evenly, and add 120 parts of xylene to obtain the coating.

[0041] Example 3

[0042] S1. Prepare acrylic resin: Add 15 parts of xylene and 15 parts of butyl acetate to the reaction kettle, stir evenly, heat up to 110°C, add 35 parts of methyl methacrylate, 15 parts of methacrylic acid, 30 parts of butyl acrylate, 20 parts of 2,2-dimethyl-3-(3-methylenepent-4-enyl)oxirane, 2 parts of styrene, and 0.05 part of dibenzoyl peroxide, react for 30 min, add 3 parts of RHU-5070D, and continue to react for 30 min to obtain the acrylic resin.

[0043] S2. Mix 55 parts of the obtained acrylic resin, 0.5 part of methacrylic acid, 0.5 part of leveling agent BYK333, 0.5 part of defoaming agent BYK-141, 10 parts of xylene, 10 parts of butyl acetate, 15 parts of silicon dioxide, and 15 parts of pigment to obtain Component A; mix 50 parts of isocyanate, 50 parts of butyl acetate, and 0.5 part of dibutyltin dilaurate to obtain Component B;

[0044] S3. Mix Component A and Component B evenly, and add 120 parts of xylene to obtain the coating.

[0045] Example 4

[0046] S1. Prepare acrylic resin: Add 10 parts of xylene and 10 parts of butyl acetate to the reaction kettle, stir evenly, heat up to 100 °C, add 30 parts of methyl methacrylate, 10 parts of methacrylic acid, 25 parts of butyl acrylate, 10 parts of 2,2-dimethyl-3-(3-methylenepent-4-enyl)oxirane, 1.5 parts of styrene, and 0.07 part of azobisisobutyronitrile, react for 35 min, add 2.5 parts of RHU-5070D, and continue to react for 35 min to obtain the acrylic resin;

[0047] S2. Mix 50 parts of the obtained acrylic resin, 0.3 part of methacrylic acid, 0.3 part of leveling agent BYK333, 0.3 part of defoaming agent BYK-141, 5 parts of xylene, 5 parts of butyl acetate, 10 parts of silicon dioxide, and 10 parts of pigment to obtain Component A; mix 40 parts of isocyanate, 40 parts of butyl acetate, and 0.4 part of dibutyltin dilaurate to obtain Component B;

[0048] S3. Mix Component A and Component B evenly, and add 100 parts of butyl acetate to obtain the coating.

[0049] Example 5

[0050] S1. Prepare acrylic resin: Add 20 parts of xylene and 20 parts of butyl acetate to the reaction kettle, stir evenly, heat up to 120 °C, add 40 parts of methyl methacrylate, 20 parts of methacrylic acid, 35 parts of butyl acrylate, 20 parts of 2,2-dimethyl-3-(3-methylenepent-4-enyl)oxirane, 2.5 parts of styrene, and 0.1 part of ammonium persulfate, react for 40 min, add 3.5 parts of RHU-5070D, and continue to react for 40 min to obtain the acrylic resin;

[0051] S2, 60 parts of the obtained acrylic resin, 0.8 parts of methacrylic acid, 0.8 parts of leveling agent BYK3550, 0.8 parts of defoaming agent BYK-054, 12.5 parts of xylene, 12.5 parts of butyl acetate, 20 parts of talc, and 20 parts of pigment are mixed to obtain component A; 60 parts of isocyanate, 60 parts of butyl acetate, and 0.6 parts of stannous octoate are mixed to obtain component B;

[0052] S3. Mix component A and component B evenly, add 150 parts of butyl acetate to obtain a coating.

[0053] Comparative Example 1

[0054] The only difference from Example 1 is that 2,2-dimethyl-3-(3-methylenepent-4-enyl)oxirane is not added.

[0055] The coatings obtained in Examples 1 to 5 and Comparative Example 1 were tested for thickness by referring to the method of GB / T 13452.2-2008 "Determination of film thickness of paints and varnishes", and the adhesion was tested by spraying the coating on a tinplate with a size of 120 mm × 50 mm × 0.20 mm by referring to the method of GB / T 1720-2020 "Paint film scratch test", and the hardness was tested by referring to the method of GB / T 6739-2006 "Determination of film hardness of paints and varnishes by pencil method", and the mass loss was tested by referring to the method of GB / T 1768-2006 "Determination of abrasion resistance of paints and varnishes by rotating rubber grinding wheel method", and the test results are recorded in Table 1.

[0056] Table 1 Properties of coatings

[0057] Thickness Adhesion Hardness Mass loss (750g, 500 revolutions) Example 1 100μm Grade 1 4H 0.027g Example 2 100μm Grade 1 3H 0.031g Example 3 100μm Grade 1 4H 0.028g Example 4 100μm Grade 1 4H 0.029g Example 5 100μm Grade 1 4H 0.026g Comparative Example 1 100μm Grade 2 3H 0.036g

[0058] It can be seen from Table 1 that the coating provided by the present invention has an adhesion of level 1, a hardness of more than 3H, a mass loss of less than 0.031g, and excellent wear resistance.

[0059] Compared with Comparative Example 1, Example 1 adds 2,2-dimethyl-3-(3-methylenepent-4-enyl) oxirane, while Comparative Example 1 does not add 2,2-dimethyl-3-(3-methylenepent-4-enyl) oxirane. The adhesion, hardness and wear resistance of the coating obtained in Example 1 are better than those in Comparative Example 1. This indicates that the addition of 2,2-dimethyl-3-(3-methylenepent-4-enyl) oxirane can improve the dispersibility of inorganic nanoparticles in the coating, thereby improving the adhesion, hardness and wear resistance of the coating.

[0060] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A flexible acrylic resin, characterized in that, It comprises components in the following parts by mass: 30 - 40 parts of methyl methacrylate, 10 - 20 parts of methacrylic acid, 25 - 35 parts of butyl acrylate, 10 - 20 parts of 2,2 - dimethyl - 3-(3 - methylenepent - 4 - enyl)oxirane, 1.5 - 2.5 parts of styrene, 0.05 - 0.1 part of initiator, 20 - 40 parts of solvent, 2.5 - 3.5 parts of elastic powder. Mix the components in the above parts by mass of methyl methacrylate, methacrylic acid, butyl acrylate, 2,2 - dimethyl - 3-(3 - methylenepent - 4 - enyl)oxirane, styrene, solvent and initiator, add the component in the above parts by mass of elastic powder after reaction, and continue the reaction to obtain a flexible acrylic resin.

2. A flexible acrylic resin according to claim 1, characterized in that, The initiator includes one or more of benzoyl peroxide, azobisisobutyronitrile, ammonium persulfate.

3. A flexible acrylic resin according to claim 1, characterized in that, The solvent includes xylene and butyl acetate.

4. A flexible acrylic resin according to claim 3, characterized in that, The mass ratio of the xylene to the butyl acetate is 1:

1.

5. The preparation method of a flexible acrylic resin according to claim 1, characterized in that, Mix the components in the above parts by mass of methyl methacrylate, methacrylic acid, butyl acrylate, 2,2 - dimethyl - 3-(3 - methylenepent - 4 - enyl)oxirane, styrene, solvent and initiator, add the component in the above parts by mass of elastic powder after reaction, and continue the reaction to obtain a flexible acrylic resin.

6. The preparation method of a flexible acrylic resin according to claim 5, characterized in that, The reaction temperature is independently 100 - 120 °C, and the reaction time is independently 30 - 40 min.

7. A coating, characterized in that, It includes component A and component B in the following parts by mass. Component A includes: 50 - 60 parts of the flexible acrylic resin described in any one of claims 1 - 3 or the flexible acrylic resin obtained by the preparation method described in any one of claims 5 - 6, 0.3 - 0.8 part of dispersant, 0.3 - 0.8 part of leveling agent, 0.3 - 0.8 part of defoaming agent, 10 - 25 parts of solvent, 10 - 20 parts of filler, 10 - 20 parts of pigment. Component B includes: 40 - 60 parts of curing agent, 40 - 60 parts of solvent, 0.4 - 0.6 part of drier.

8. A paint according to claim 7, characterized in that, The mass ratio of the 2,2 - dimethyl - 3-(3 - methylenepent - 4 - enyl)oxirane to the filler is 1:

1.

9. The preparation method of a coating according to claim 7, characterized in that, It includes the following steps: S1. Mix the flexible acrylic resin, dispersant, leveling agent, defoaming agent, solvent, filler and pigment to obtain component A. S2. Mix the curing agent, solvent and drier to obtain component B. S3. When in use, mix component A and component B and dilute them to obtain a coating.

10. Application of a coating according to claim 7 on a camouflage tarpaulin.