A stain-resistant and corrosion-resistant coating and a preparation method thereof

Abstract

The present application relates to the field of paint, specifically relates to a kind of anti-fouling corrosion-resistant paint and preparation method thereof;The paint includes component A and component B;The mass ratio of component A and component B is (3~10):1;The component A includes the following weight parts of component: resin 60~120 parts, weather-resistant pigment and filler 5~20 parts, modified TiO2 Anti-fouling filler 10~30 parts, Anti-fouling auxiliary 0.1~15 parts, film-forming auxiliary 0.01~10 parts, rheological auxiliary 0.01~10 parts, matting powder 0.01~5 parts;The component B includes isocyanate curing agent;The raw material of the modified TiO2 Anti-fouling filler includes 1H,1H,2H,2H-Perfluorooctyltrimethoxysilane and titanium dioxide;The paint obtained by the selected component compounding has excellent corrosion resistance, aging resistance, weather resistance and Anti-fouling effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coatings, in particular to a stain and corrosion resistant coating and a preparation method thereof. BACKGROUND

[0002] When performing flight tasks, aircrafts need to face the challenges of harsh environments such as strong ultraviolet radiation, high humidity, high salt fog, etc. in special areas such as coastal areas and plateaus. In addition, during high-speed takeoff and flight, the coating on the nose of the aircraft will be eroded by the airflow. Long-term exposure to the natural environment, the coating is prone to aging, discoloration, loss of luster and other phenomena. During the parking of the aircraft, dust in the natural environment and oil fume in the engine exhaust will adhere to the rear and lower surface of the aircraft, forming different degrees of pollution, resulting in a significant reduction or even complete loss of the protective and decorative functions of the coating. These problems not only seriously threaten the flight safety of the aircraft, but also greatly limit the service life of the aircraft. Therefore, improving the performance stability of the aircraft surface coating in complex environments such as ultraviolet, salt fog and humidity, and meeting the safe use requirements of the aircraft, has become a key direction for the development of aircraft surface coating technology in the future.

[0003] Chinese patent CN109731758A discloses a method for preparing a wear-resistant, stain-resistant and corrosion-resistant coating on an aluminum alloy surface by plasma treatment. The method is to add hexagonal boron nitride nanosheets to water-based epoxy resin, then sequentially add water-based curing agent, organically modified silicon carbide, modified nano-silica sol and wet-modified zinc oxide whiskers to prepare a wear-resistant, stain-resistant and corrosion-resistant coating. After sandblasting and oxygen low-temperature plasma treatment on the surface of the aluminum alloy, the above-mentioned wear-resistant, stain-resistant and corrosion-resistant coating is sprayed on the surface of the aluminum alloy by electrostatic spraying, and the corresponding wear-resistant, stain-resistant and corrosion-resistant coating is obtained after curing. Although the coating has certain stain resistance and can delay the diffusion of corrosion medium to play a protective role, its stain resistance is mainly achieved through hydrophobic effect. For those pollutants with strong adhesion, the stain resistance of the coating will be greatly reduced. In addition, with the passage of time and the increase of use frequency, the hydrophobic property of the coating surface will gradually decrease, which will lead to a decrease in hydrophobic effect and affect the final stain resistance of the coating.

[0004] In view of this, the present application is proposed. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a stain and corrosion resistant coating and a preparation method thereof, which can solve the problem of limited stain resistance of the wear-resistant, stain-resistant and corrosion-resistant coating in the prior art and the decrease in stain resistance with time and use frequency.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] The application provides a kind of anti-fouling and corrosion-resistant paint, including component A and component B;The mass ratio of component A and component B is (3-10) :1;

[0008] The component A includes the following components by weight: resin 60-120 parts, weather-resistant pigment and filler 5-20 parts, modified TiO2 antifouling filler 10-30 parts, antifouling additive 0.1-15 parts, film-forming aid 0.01-10 parts, rheological aid 0.01-10 parts, and flatting powder 0.01-5 parts;

[0009] The component B includes isocyanate curing agent;

[0010] The raw materials for preparing the modified TiO2 antifouling filler include 1H,1H,2H,2H-perfluorooctyltrimethoxysilane and titanium dioxide, and the molar ratio of 1H,1H,2H,2H-perfluorooctyltrimethoxysilane to titanium dioxide is (1-1.5) :1, and the titanium dioxide is preferably nano-titanium dioxide.

[0011] Specifically, the preparation method of the modified TiO2 antifouling filler includes the following steps:

[0012] s1, ethanol and water are mixed uniformly at a volume ratio of (1.5-3) :1 to prepare a hydrolysis solution;

[0013] s2, under stirring, 1H,1H,2H,2H-perfluorooctyltrimethoxysilane is slowly added to the hydrolysis solution to obtain a first reaction system, and the mass of 1H,1H,2H,2H-perfluorooctyltrimethoxysilane accounts for 1-5% of the total mass of the first reaction system;

[0014] s3, the first reaction system is continuously stirred at a preset temperature to make the 1H,1H,2H,2H-perfluorooctyltrimethoxysilane undergo hydrolysis reaction to obtain a second reaction system, and the 1H,1H,2H,2H-perfluorooctyltrimethoxysilane forms silicon hydroxyl on the surface after hydrolysis reaction;

[0015] The process of hydrolysis reaction of 1H,1H,2H,2H-perfluorooctyltrimethoxysilane is as follows:

[0016] ;

[0017] s4, titanium dioxide is dispersed in the second reaction system for reaction to make the silicon hydroxyl and the hydroxyl on the surface of titanium dioxide undergo grafting reaction to obtain the modified TiO2 antifouling filler, and the process of grafting reaction between 1H,1H,2H,2H-perfluorooctyltrimethoxysilane after hydrolysis reaction and the hydroxyl on the surface of titanium dioxide is as follows:

[0018] .

[0019] Specifically, in s3, the preset temperature is 20-65 DEG C, and the stirring time is 0.5-2h.

[0020] Specifically, the resin is mixed by fluorocarbon resin and acrylic resin, and the mass ratio of the fluorocarbon resin and the acrylic resin is (1.5-2.5):1.

[0021] Specifically, the weather-resistant pigment filler is inorganic pigment with a pigment fastness level of seven or more; the weather-resistant pigment filler comprises at least one of red iron oxide, yellow iron oxide, titanium nickel yellow, phthalocyanine blue, cobalt blue, copper chromium black and carbon black.

[0022] Specifically, the anti-fouling aid includes light shielding agent, light absorbing agent and light stabilizer, and the volume ratio of the light shielding agent, the light absorbing agent and the light stabilizer is (1-3):(1-3):(1-3).

[0023] The light shielding agent is zinc oxide or zinc barium white, the light absorbing agent is one of 2,4-dihydroxybenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole and 2,4,6-tris(4-butoxy-2-hydroxyphenyl)-1,3,5-triazine, and the light stabilizer is hindered amine light stabilizer (HALS).

[0024] Specifically, the film-forming aid is one of propylene glycol methyl ether acetate, ethylene glycol butyl ether, propylene glycol phenyl ether, diisobutyl adipate and benzyl benzoate.

[0025] Specifically, the rheological aid is one of bentonite, polyurea polyurethane, polyurethane associated thickening agent and hydroxyethyl cellulose.

[0026] Specifically, the matting powder is one of silicon dioxide, aluminum stearate, zinc stearate, talc, oxidized polyethylene wax, polymethyl methacrylate and polystyrene.

[0027] The application also provides a preparation method of the anti-fouling and corrosion-resistant coating, and the method comprises the following steps: uniformly mixing the resin, the weather-resistant pigment filler, the modified TiO2 anti-fouling filler, the anti-fouling aid, the film-forming aid, the rheological aid and the matting powder to obtain a mixed system; and adding isocyanate curing agent into the mixed system and uniformly mixing to obtain the anti-fouling and corrosion-resistant coating.

[0028] Compared with the prior art, the application has the following beneficial effects:

[0029] (1) The modified TiO2 antifouling filler in the present application takes TiO2 particles as a modified body, and the surface thereof is grafted and modified, so that it has a photocatalytic effect. Therefore, when it is irradiated by ultraviolet light, it will absorb light energy and catalyze the decomposition of the dirt attached to the surface of the coating layer system, realizing the antifouling effect of the coating layer. Secondly, TiO2 particles are a hydrophobic filler, so that after the modified TiO2 antifouling filler is added, the surface energy of the coating layer system is reduced. With the water vapor in the air forming water droplets and rolling on the surface of the coating layer in a spherical shape, part of the dirt will be taken away, thus enhancing the antifouling effect of the coating layer. Thirdly, TiO2 particles have high specific surface area and surface energy, can be embedded into the interstitial space of the resin molecular chain, form a "nano anchoring" effect, and thus form a strong interfacial bonding energy with the resin, further improving the adhesion and hardness of the coating layer. Finally, TiO2 particles themselves have strong chemical inertness, can enhance the resistance of the coating layer to salt spray and acidic atmosphere and other media, and enhance the salt spray corrosion resistance and acid atmosphere resistance of the coating layer.

[0030] (2) The resin in the present application is compounded by fluorocarbon resin and acrylic resin. The fluorocarbon resin contains C-F bonds, and the bond energy reaches 485 kJ / mol, so it can resist the damage of ultraviolet light and exhibit excellent weather resistance. The fluorine groups contained in the fluorocarbon resin are both water-repellent and oil-repellent, so the fluorocarbon resin has excellent water resistance, acid and alkali resistance and stain resistance. Therefore, the fluorocarbon resin is used as the main component of the coating, which can make the coating have excellent corrosion resistance, weather resistance and stain resistance. The hydrogen bonds are formed between the acrylic resin and the fluorocarbon resin, which can produce a molecular anchoring effect at the interface between the acrylic resin and the fluorocarbon resin, reduce the phase separation, make the internal structure of the coating more uniform, improve the adhesion, and in addition, the hydrogen bond is a "physical crosslinking point", which can limit the movement of the resin molecular chain and improve the hardness of the coating.

[0031] (3) The weather-resistant pigment filler in the present application has a reinforcing effect on the coating, can resist ultraviolet aging in combination with the fluorocarbon resin, makes the coating system more durable, and better plays a color protection effect. The antifouling additives include light shielding agents, light absorbing agents and light stabilizers. The light shielding agent can absorb or reflect ultraviolet light, so that it does not penetrate into the inside of the coating layer system, reducing the damage of ultraviolet light to the coating layer. The light absorbing agent can absorb most of the harmful radiation with high energy to the coating layer system, and release heat energy, so that the degradation rate of the resin in the coating layer system is greatly slowed down. The light stabilizer and the light absorbing agent are used in combination, and their synergistic effect has obvious advantages in the surface effect protection of the coating, so that the coating has good aging resistance. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0033] Embodiment 1

[0034] The embodiment provides a stain-resistant and corrosion-resistant coating, which is composed of component A and an isocyanate curing agent, and the mass ratio of the component A to the isocyanate curing agent is 3:1.

[0035] The component A is composed of the following components in parts by mass:

[0036] 60 parts of resin, 5 parts of red iron oxide, 10 parts of modified TiO2 antifouling filler, 0.1 part of antifouling aid, 0.01 part of propylene glycol methyl ether acetate, 0.01 part of bentonite and 0.01 part of silicon dioxide;

[0037] The resin is a mixture of fluorocarbon resin and acrylic resin, and the mass ratio of the fluorocarbon resin to the acrylic resin is 1.5:1.

[0038] The modified TiO2 antifouling filler is prepared by the following method:

[0039] s1, ethanol and water are uniformly mixed in a volume ratio of 1.5:1 to prepare a hydrolysis solution;

[0040] s2, under the condition of stirring at 200 rpm, 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane is added to the hydrolysis solution to obtain a first reaction system; the mass of the 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane accounts for 1% of the total mass of the first reaction system;

[0041] s3, the first reaction system is continuously stirred at 20℃ for 2h to make the 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane undergo hydrolysis reaction to obtain a second reaction system; after the 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane undergoes hydrolysis reaction, silicon hydroxyl groups are formed on the surface;

[0042] s4, titanium dioxide is dispersed in the second reaction system for reaction, so that the silicon hydroxyl groups and the hydroxyl groups on the surface of the titanium dioxide undergo grafting reaction to obtain the modified TiO2 antifouling filler.

[0043] The molar ratio of the 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane to the titanium dioxide is 1:1.

[0044] The antifouling auxiliary agent is composed of zinc oxide, 2,4-dihydroxybenzophenone and HALS, and the volume ratio of zinc oxide, 2,4-dihydroxybenzophenone and HALS is 1:2:1.

[0045] The anti-fouling and corrosion-resistant paint provided by the embodiment is prepared by the following method:

[0046] After 60 parts of resin, 5 parts of iron oxide red, 10 parts of modified TiO2 antifouling filler, 0.1 part of antifouling auxiliary agent, 0.01 part of propylene glycol methyl ether acetate, 0.01 part of bentonite and 0.01 part of silicon dioxide are mixed, stirring for 0.5h, a uniform mixed system is obtained; the isocyanate curing agent is added into the mixed system in proportion, stirring for 1h, and the anti-fouling and corrosion-resistant paint is obtained.

[0047] Example 2

[0048] The anti-fouling and corrosion-resistant paint provided by the embodiment is prepared by the following method:

[0049] Component A is composed of the following components by mass:

[0050] Resin 70 parts, iron oxide yellow 8 parts, modified TiO2 antifouling filler 15 parts, antifouling auxiliary agent 0.8 parts, ethylene glycol butyl ether 0.2 parts, polyurea polyurethane 0.05 parts, aluminum stearate 0.08 parts;

[0051] The resin is a mixture of fluorocarbon resin and acrylic resin, and the mass ratio of fluorocarbon resin to acrylic resin is 1.8:1.

[0052] The modified TiO2 antifouling filler is prepared by the following method:

[0053] s1, ethanol and water are mixed uniformly in a volume ratio of 2:1 to prepare a hydrolysis solution;

[0054] s2, under the condition of stirring at 250rpm, 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane is added to the hydrolysis solution to obtain a first reaction system; the mass of 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane accounts for 2% of the total mass of the first reaction system;

[0055] s3, the first reaction system is continuously stirred at 25℃ for 1h to make the 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane hydrolyze to obtain a second reaction system; after the hydrolysis reaction of 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane, silicon hydroxyl groups are formed on the surface;

[0056] s4, dispersing titanium dioxide in the second reaction system to react, so that the silicon hydroxyl group and the hydroxyl group on the surface of titanium dioxide are grafted to obtain the modified TiO2 antifouling filler.

[0057] The molar ratio of 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane to titanium dioxide is 1.1:1.

[0058] The antifouling auxiliary is composed of zinc oxide, 2-hydroxy-4-n-octyloxybenzophenone and HALS, and the volume ratio of zinc oxide, 2-hydroxy-4-n-octyloxybenzophenone and HALS is 1.5:1:1.

[0059] The antifouling and corrosion-resistant coating provided by the embodiment is prepared by the following method:

[0060] After 70 parts of resin, 8 parts of iron oxide yellow, 15 parts of modified TiO2 antifouling filler, 0.8 parts of antifouling auxiliary, 0.2 parts of ethylene glycol butyl ether, 0.05 parts of polyurea polyurethane and 0.08 parts of aluminum stearate are mixed, stirring for 0.7h, a uniform mixed system is obtained; the isocyanate curing agent is added into the mixed system in proportion, stirring for 1.5h, and mixing uniformly to obtain the antifouling and corrosion-resistant coating.

[0061] Example 3

[0062] The antifouling and corrosion-resistant coating provided by the embodiment is prepared by the following method:

[0063] Component A is composed of the following components by mass:

[0064] Resin 85 parts, titanium nickel yellow 11 parts, modified TiO2 antifouling filler 18 parts, antifouling auxiliary 3 parts, propylene glycol phenyl ether 2 parts, polyurethane associated thickener 5 parts, zinc stearate 0.3 parts;

[0065] The resin is a mixture of fluorocarbon resin and acrylic resin, and the mass ratio of fluorocarbon resin to acrylic resin is 2:1.

[0066] The modified TiO2 antifouling filler is prepared by the following method:

[0067] s1, ethanol and water are mixed uniformly in a volume ratio of 2.2:1 to prepare a hydrolysis solution;

[0068] s2, under the condition of stirring at 300rpm, 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane is added to the hydrolysis solution to obtain a first reaction system; the mass of 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane accounts for 3% of the total mass of the first reaction system;

[0069] s3, continuously stirring the first reaction system at 45℃ for 1.5h to make the 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane undergo hydrolysis reaction to obtain a second reaction system; after the 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane undergoes hydrolysis reaction, a silicon hydroxyl group is formed on the surface thereof;

[0070] s4, dispersing titanium dioxide in the second reaction system to make the silicon hydroxyl group and the hydroxyl group on the surface of the titanium dioxide undergo grafting reaction to obtain the modified TiO2 antifouling filler.

[0071] The molar ratio of the 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane to the titanium dioxide is 1.2:1.

[0072] The antifouling auxiliary is composed of zinc oxide, 2-(2'-hydroxy-3', 5'-di-tert-phenyl)-5-chlorobenzotriazole and HALS, and the volume ratio of the zinc oxide, 2-(2'-hydroxy-3', 5'-di-tert-phenyl)-5-chlorobenzotriazole and HALS is 2:1:2.

[0073] The antifouling and corrosion-resistant coating provided by the embodiment is prepared by the following method:

[0074] After 85 parts of resin, 11 parts of titanium nickel yellow, 18 parts of modified TiO2 antifouling filler, 3 parts of antifouling auxiliary, 2 parts of propylene glycol phenyl ether, 5 parts of polyurethane associated thickener and 0.3 parts of zinc stearate are mixed, stirring is carried out for 1h to obtain a uniform mixed system; the isocyanate curing agent is added into the mixed system in proportion, stirring is carried out for 2h, and the mixture is uniformly mixed to obtain the antifouling and corrosion-resistant coating.

[0075] Example 4

[0076] The antifouling and corrosion-resistant coating provided by the embodiment is prepared by the following method:

[0077] The component A is composed of the following components in parts by mass:

[0078] Resin 100 parts, phthalocyanine blue 15 parts, modified TiO2 antifouling filler 25 parts, antifouling auxiliary 8 parts, diisobutyl adipate 5 parts, hydroxyethyl cellulose 6 parts, talc 2 parts;

[0079] The resin is a mixture of fluorocarbon resin and acrylic resin, and the mass ratio of the fluorocarbon resin to the acrylic resin is 2.5:1.

[0080] The modified TiO2 antifouling filler is prepared by the following method:

[0081] s1, uniformly mixing ethanol and water in a volume ratio of 2.5:1 to prepare a hydrolysis solution;

[0082] s2, after 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane is added to the hydrolysis solution under the condition of stirring at 350 rpm, a first reaction system is obtained; the mass of the 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane accounts for 4% of the total mass of the first reaction system;

[0083] s3, the 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane is subjected to a hydrolysis reaction under the condition of continuous stirring at 50℃ for 2h, and a second reaction system is obtained; the 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane forms a silicon hydroxyl group on the surface after the hydrolysis reaction;

[0084] s4, the titanium dioxide is dispersed in the second reaction system for reaction, so that the silicon hydroxyl group and the hydroxyl group on the surface of the titanium dioxide are subjected to a grafting reaction, and a modified TiO2 antifouling filler is obtained.

[0085] The molar ratio of 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane to titanium dioxide is 1.3:1.

[0086] The antifouling auxiliary is composed of lithopone, 2,4,6-tris(4-butoxy-2-hydroxyphenyl)-1,3,5-triazine and HALS, and the volume ratio of lithopone, 2,4,6-tris(4-butoxy-2-hydroxyphenyl)-1,3,5-triazine and HALS is 1:1:1.

[0087] The antifouling and corrosion-resistant coating provided by the embodiment is prepared by the following method:

[0088] After 100 parts of resin, 15 parts of phthalocyanine blue, 25 parts of modified TiO2 antifouling filler, 8 parts of antifouling auxiliary, 5 parts of diisobutyl adipate, 6 parts of hydroxyethyl cellulose and 2 parts of talc are mixed, stirring is carried out for 2.5h to obtain a uniform mixed system; the isocyanate curing agent is added to the mixed system in proportion, and stirring is carried out for 3.5h to obtain an antifouling and corrosion-resistant coating.

[0089] Example 5

[0090] The embodiment provides an antifouling and corrosion-resistant coating, which is composed of component A and an isocyanate curing agent, and the mass ratio of the component A to the isocyanate curing agent is 8:1.

[0091] The component A is composed of the following components in parts by mass:

[0092] Resin 110 parts, cobalt blue 17 parts, modified TiO2 antifouling filler 27 parts, antifouling auxiliary 10 parts, propylene glycol phenyl ether 8 parts, bentonite 8 parts, and polyethylene oxide wax 3 parts;

[0093] The resin is a mixture of fluorocarbon resin and acrylic resin, and the mass ratio of the fluorocarbon resin and the acrylic resin is 2:1.

[0094] The modified TiO2 antifouling filler is prepared by the following method:

[0095] s1, ethanol and water are mixed uniformly at a volume ratio of 3:1 to prepare a hydrolysis solution;

[0096] s2, under the condition of stirring at 400 rpm, 1H, 1H, 2H, 2H-perfluorooctyl trimethoxysilane is added to the hydrolysis solution to obtain a first reaction system; the mass of the 1H, 1H, 2H, 2H-perfluorooctyl trimethoxysilane accounts for 5% of the total mass of the first reaction system;

[0097] s3, the first reaction system is continuously stirred at 55℃ for 1h to make the 1H, 1H, 2H, 2H-perfluorooctyl trimethoxysilane hydrolyze to obtain a second reaction system; the 1H, 1H, 2H, 2H-perfluorooctyl trimethoxysilane hydrolyzes to form a silicon hydroxyl on the surface;

[0098] s4, titanium dioxide is dispersed in the second reaction system to react, so that the silicon hydroxyl and the hydroxyl on the surface of the titanium dioxide graft to obtain the modified TiO2 antifouling filler.

[0099] The molar ratio of 1H, 1H, 2H, 2H-perfluorooctyl trimethoxysilane to titanium dioxide is 1.4:1.

[0100] The antifouling aid is composed of lithopone, 2,4-dihydroxybenzophenone and HALS, and the volume ratio of lithopone, 2,4-dihydroxybenzophenone and HALS is 3:1:2.

[0101] The antifouling and corrosion-resistant coating provided by the embodiment is prepared by the following method:

[0102] 110 parts of resin, 17 parts of cobalt blue, 27 parts of modified TiO2 antifouling filler, 10 parts of antifouling aid, 8 parts of propylene glycol phenyl ether, 8 parts of bentonite and 3 parts of oxidized polyethylene wax are mixed, stirred for 2.5h to obtain a uniform mixed system; the isocyanate curing agent is added to the mixed system in proportion, stirred for 4h, and mixed uniformly to obtain the antifouling and corrosion-resistant coating.

[0103] Example 6

[0104] The antifouling and corrosion-resistant coating provided by the embodiment is prepared by the following method:

[0105] Component A is composed of the following components:

[0106] Resin 120 parts, weather-resistant pigment and filler 20 parts, modified TiO2 antifouling filler 30 parts, antifouling additive 12 parts, diisobutyl adipate 8 parts, bentonite 7 parts, polymethyl methacrylate 5 parts;

[0107] The resin is a mixture of fluorocarbon resin and acrylic resin, and the mass ratio of the fluorocarbon resin to the acrylic resin is 2:1.

[0108] The weather-resistant pigment and filler are compounded by cobalt blue and copper-chromium black, and the volume ratio of the cobalt blue to the copper-chromium black is 2:1.

[0109] The modified TiO2 antifouling filler is prepared by the following method:

[0110] s1, ethanol and water are mixed uniformly at a volume ratio of 2:1 to prepare a hydrolysis solution;

[0111] s2, under the condition of stirring at 450 rpm, 1H, 1H, 2H, 2H-perfluorooctyl trimethoxysilane is added to the hydrolysis solution to obtain a first reaction system; the mass of the 1H, 1H, 2H, 2H-perfluorooctyl trimethoxysilane accounts for 2% of the total mass of the first reaction system;

[0112] s3, the first reaction system is continuously stirred at 60℃ for 0.8h to make the 1H, 1H, 2H, 2H-perfluorooctyl trimethoxysilane hydrolyze to obtain a second reaction system; the 1H, 1H, 2H, 2H-perfluorooctyl trimethoxysilane hydrolyzes to form a silicon hydroxyl group on the surface;

[0113] s4, titanium dioxide is dispersed in the second reaction system to react, so that the silicon hydroxyl group and the hydroxyl group on the surface of the titanium dioxide graft to obtain the modified TiO2 antifouling filler.

[0114] The molar ratio of 1H, 1H, 2H, 2H-perfluorooctyl trimethoxysilane to titanium dioxide is 1.5:1

[0115] The antifouling additive is composed of zinc white, 2-hydroxy-4-n-octyloxy benzophenone and HALS, and the volume ratio of zinc white, 2-hydroxy-4-n-octyloxy benzophenone and HALS is 3:2:1.

[0116] The anti-fouling and corrosion-resistant paint provided by the embodiment is prepared by the following method:

[0117] The 120 parts of resin, 20 parts of weather-resistant pigment filler, 30 parts of modified TiO2 antifouling filler, 12 parts of antifouling aid, 8 parts of diisobutyl adipate, 7 parts of bentonite and 5 parts of polymethyl methacrylate are mixed, stirred for 3h, and a uniform mixed system is obtained; the isocyanate curing agent is added into the mixed system in proportion, stirred for 4h, and uniformly mixed to obtain the antifouling and corrosion-resistant coating.

[0118] Example 7

[0119] The present embodiment provides an antifouling and corrosion-resistant coating, which is composed of component A and isocyanate curing agent, and the mass ratio of component A to isocyanate curing agent is 10:1.

[0120] Component A is composed of the following components in parts by mass:

[0121] Resin 120 parts, weather-resistant pigment filler 10 parts, modified TiO2 antifouling filler 25 parts, antifouling aid 15 parts, benzyl benzoate 10 parts, hydroxyethyl cellulose 10 parts, polystyrene 3 parts;

[0122] The resin is a mixture of fluorocarbon resin and acrylic resin, and the mass ratio of fluorocarbon resin to acrylic resin is 2.5:1.

[0123] The modified TiO2 antifouling filler is prepared by the following method:

[0124] s1, ethanol and water are mixed in a volume ratio of 3:1 to obtain a hydrolysis solution;

[0125] s2, under the condition of stirring at 500 rpm, 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane is added to the hydrolysis solution to obtain a first reaction system; the mass of 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane accounts for 5% of the total mass of the first reaction system;

[0126] s3, the first reaction system is continuously stirred at 65℃ for 0.5h to make the 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane hydrolyze to obtain a second reaction system; the 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane hydrolyzes to form a silicon hydroxyl group on the surface;

[0127] s4, titanium dioxide is dispersed in the second reaction system to react, so that the silicon hydroxyl group and the hydroxyl group on the surface of titanium dioxide undergo grafting reaction to obtain the modified TiO2 antifouling filler.

[0128] The molar ratio of 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane to titanium dioxide is 1.3:1.

[0129] The anti-fouling assistant is composed of zinc white, 2,4,6-tris(4-butoxy-2-hydroxyphenyl)-1,3,5-triazine and HALS, and the volume ratio of zinc white, 2,4,6-tris(4-butoxy-2-hydroxyphenyl)-1,3,5-triazine and HALS is 1:3:3.

[0130] The anti-fouling and corrosion-resistant paint provided by the embodiment is prepared by the following method:

[0131] After 120 parts of resin, 10 parts of weather-resistant pigment filler, 25 parts of modified TiO2 anti-fouling filler, 15 parts of anti-fouling assistant, 10 parts of benzyl benzoate, 10 parts of hydroxyethyl cellulose and 3 parts of polystyrene are mixed, stirring is carried out for 2 hours to obtain a uniform mixed system; the isocyanate curing agent is added into the mixed system in proportion, and stirring is carried out for 5 hours to obtain the anti-fouling and corrosion-resistant paint.

[0132] Comparative Example 1

[0133] The difference between the comparative example and the embodiment 1 is that the comparative example does not contain the modified TiO2 anti-fouling filler, and the others are the same as the embodiment 1.

[0134] Comparative Example 2

[0135] The difference between the comparative example and the embodiment 1 is that the comparative example does not contain the acrylic resin, and the others are the same as the embodiment 1.

[0136] In order to better illustrate the beneficial effects of the present application, the paint prepared in the embodiment 1-5 and the comparative examples 1-2 is sprayed on an aluminum alloy substrate by an air spraying method to obtain coating samples 1#-7#, wherein the coating prepared from the paint of the embodiment 1-5 corresponds to the coating samples 1#-5# in turn, the coating prepared from the paint of the comparative examples 1-2 corresponds to the coating samples 6#, 7# in turn, and the coating samples 1#-7# are tested in terms of physical, mechanical, liquid medium resistance and environmental resistance performance, and the test results are shown in Table 1:

[0137] Table 1: Performance test results of coating samples

[0138]

[0139] As can be seen from Table 1, the paint provided by the present application has excellent anti-fouling performance and good comprehensive performance. The test results of the comparative sample 1# and the sample 6# show that the modified TiO2 anti-fouling filler can significantly improve the anti-fouling performance of the paint, and can further improve the adhesion and hardness of the paint after film formation, and can also enhance the salt spray corrosion resistance and acid atmosphere resistance of the coating. The test results of the comparative sample 1# and the sample 7# show that the fluorocarbon resin and the acrylic resin can synergistically improve the adhesion and hardness of the paint after film formation.

[0140] The detailed description set forth above discloses merely the preferred embodiments of the present application and is not intended to limit the scope of the application. Various modifications and variations will be apparent to those skilled in the art from this detailed description, which is given by way of example only. Although specific terms have been employed herein, such terms are intended in a descriptive sense and not for purposes of limitation.

[0141] It is to be understood that the application is not limited to the details described above and that numerous modifications and changes can be made without departing from the scope of the application. The scope of the application should only be limited by the claims accompanying this disclosure.

Claims

1. A stain and corrosion resistant coating, characterized by, Comprise component A and component B; the mass ratio of component A to component B is (3~10):1; The component A comprises the following components by weight: resin 60~120 parts, weather-resistant pigment and filler 5~20 parts, modified TiO2 antifouling filler 10~30 parts, antifouling aid 0.1~15 parts, film-forming aid 0.01~10 parts, rheological aid 0.01~10 parts, and matting powder 0.01~5 parts; The component B comprises isocyanate curing agent; The preparation raw material of the modified TiO2 antifouling filler comprises 1H,1H,2H,2H-perfluorooctyltrimethoxysilane and titanium dioxide, and the molar ratio is (1~1.5):1; the preparation method of the modified TiO2 antifouling filler comprises the following steps: s1, ethanol and water are mixed uniformly at a volume ratio of (1.5~3):1 to prepare a hydrolysis solution; s2, under stirring, 1H,1H,2H,2H-perfluorooctyltrimethoxysilane is added to the hydrolysis solution to obtain a first reaction system; the mass of 1H,1H,2H,2H-perfluorooctyltrimethoxysilane accounts for 1~5% of the total mass of the first reaction system; s3, the first reaction system is continuously stirred at a preset temperature to make the 1H,1H,2H,2H-perfluorooctyltrimethoxysilane undergo hydrolysis reaction to obtain a second reaction system; after the hydrolysis reaction of 1H,1H,2H,2H-perfluorooctyltrimethoxysilane, a silicon hydroxyl group is formed on the surface; s4, titanium dioxide is dispersed in the second reaction system for reaction, so that the silicon hydroxyl group and the hydroxyl group on the surface of titanium dioxide undergo grafting reaction to obtain a modified TiO2 antifouling filler; The resin is a mixture of fluorocarbon resin and acrylic resin, and the mass ratio of the fluorocarbon resin to the acrylic resin is (1.5~2.5):1; The antifouling aid comprises light shielding agent, light absorbing agent and light stabilizer, and the volume ratio is (1~3):(1~3):(1~3); The light shielding agent is zinc oxide or zinc barium white, the light absorbing agent is one of 2,4-dihydroxybenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole and 2,4,6-tris(4-butoxy-2-hydroxyphenyl)-1,3,5-triazine, and the light stabilizer is hindered amine light stabilizer.

2. The stain and corrosion resistant coating of claim 1, wherein, In s3, the preset temperature is 20~65℃, and the stirring time is 0.5~2h.

3. The stain and corrosion resistant coating of claim 1, wherein, The weather-resistant pigment and filler is an inorganic pigment with a pigment weathering resistance grade of seven or more; the weather-resistant pigment and filler comprises at least one of iron oxide red, iron oxide yellow, titanium nickel yellow, phthalo blue, cobalt blue, copper chromium black and carbon black.

4. The stain and corrosion resistant coating of claim 1, wherein, The film-forming aid is one of propylene glycol methyl ether acetate, ethylene glycol butyl ether, propylene glycol phenyl ether, diisobutyl adipate and benzyl benzoate.

5. The stain and corrosion resistant coating of claim 1, wherein, The rheological aid is one of bentonite, polyurea polyurethane, polyurethane associated thickening agent and hydroxyethyl cellulose.

6. The stain and corrosion resistant coating of claim 1, wherein, The matting powder is one of silicon dioxide, aluminum stearate, zinc stearate, talc, oxidized polyethylene wax, polymethyl methacrylate and polystyrene.

7. A method for preparing the anti-fouling and corrosion resistant coating according to any one of claims 1 to 6, characterized in that, Comprise: The resin, weather-resistant pigment, modified TiO2 antifouling filler, antifouling auxiliary agent, film-forming auxiliary agent, rheological auxiliary agent and flatting powder are mixed uniformly to obtain a mixed system; an isocyanate curing agent is added to the mixed system and mixed uniformly to obtain the antifouling and corrosion-resistant coating.

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