An anti-fog coating liquid for a security camera

Abstract

The present invention discloses an anti-fog coating liquid for a security camera, which is prepared from the following components by weight: 30-40 parts of a functional copolymer, 3-5 parts of 1,3-bis((tris(hydroxymethyl)methyl)amino)propane, 1-3 parts of a coupling agent, 5-8 parts of an amino-terminated water-soluble hyperbranched polyamide, 3-6 parts of nano-zinc oxide, 1-3 parts of a wetting agent, 0.8-1.2 parts of an antifoaming agent, and 25-35 parts of water; the functional copolymer includes units formed from the following monomers: a monomer containing an unsaturated double bond and an epoxy group, a pyrimidine monomer containing an unsaturated double bond, a borate ester monomer containing an unsaturated double bond, an amphoteric organic ionic salt monomer containing an unsaturated double bond, and a monomer containing an unsaturated double bond and multiple hydrophilic groups. After the anti-fog coating liquid for the security camera is coated and cured on the surface of a substrate, it has a high bonding firmness with the substrate, a remarkable anti-fog effect, and excellent weather aging resistance, anti-fog performance stability and water resistance.

Description

Technical Field

[0001] The invention relates to the technical field of anti-fog coatings, and in particular to an anti-fog coating liquid for security cameras. Background Art

[0002] With the construction of modern cities and the improvement of safety awareness, surveillance cameras have become an indispensable part of our lives. As a common security product, it has brought great security to our normal production, life and work, and significantly enhanced people's sense of security. However, in some special monitoring environments, such as: rainy days in southern my country, Southeast Asia, long-distance shipping and other application scenarios with high temperature and humidity, the surveillance camera will be heavily fogged when used for a long time, which not only affects the monitoring quality, but also affects its service life.

[0003] The existing anti-fog methods mainly include spraying anti-fog agents, using electric heating to defog or forming a hydrophilic or hydrophobic polymer anti-fog coating on the lens surface. However, spraying anti-fog agents and using electric heating to defog methods have more or less disadvantages such as poor anti-fog effect, short duration, poor wear resistance, and insufficient light transmittance. Although hydrophilic or hydrophobic polymer coatings have good short-term anti-fog effects, sufficient anti-fog performance and are relatively wear-resistant, the existing polymer anti-fog coatings have more or less poor bonding strength with the substrate surface, and the coatings will become unstable and fall off after long-term use. The weather resistance, anti-fog performance stability and water resistance still need to be further improved.

[0004] In order to solve the above problems, the invention patent with the authorization announcement number CN104592850B discloses a method for preparing a super-hydrophilic transparent anti-fog coating. The invention is to form a prepolymer by reacting hydroxy acrylate with diisocyanate, and then hydrophilically modified by polysorbate emulsifier. The modified prepolymer is cured by UV radiation to form a super-hydrophilic coating. The coating has a contact angle of 3° to water, a hardness of up to 2H, excellent anti-fog performance, and a light transmittance of 91%. It can meet the anti-fog requirements of transparent panels, and has certain water resistance and excellent comprehensive performance. The preparation process of the super-hydrophilic transparent anti-fog coating is simple, and it has strong industrialization ability and application prospects. However, its weathering resistance, anti-fog stability and water resistance still need to be further improved.

[0005] It can be seen that the development of an anti-fog coating for security cameras, which, after coating and curing on the surface of the substrate, has a high degree of firm bonding with the surface of the substrate, a significant anti-fog effect, and excellent weather resistance, anti-fog performance stability and water resistance, meets the market demand, has broad market value and application prospects, and is of great significance to promoting the development of the anti-fog coating field. Summary of the invention

[0006] The main object of the present invention is to provide an anti-fog coating liquid for security cameras, which, after being coated and cured on the surface of a substrate, has a high bonding strength with the substrate surface, a remarkable anti-fog effect, excellent weather aging resistance, anti-fog performance stability and water resistance.

[0007] To achieve the above object, the present invention provides an anti-fog coating liquid for security cameras, which is prepared from the following components by weight: 30-40 parts of a functional copolymer, 3-5 parts of 1,3-bis((tris(hydroxymethyl)methyl)amino)propane, 1-3 parts of a coupling agent, 5-8 parts of an amino-terminated water-soluble hyperbranched polyamide, 3-6 parts of nano-zinc oxide, 1-3 parts of a wetting agent, 0.8-1.2 parts of an antifoaming agent, and 25-35 parts of water; the functional copolymer includes units formed from the following monomers:

[0008] (1) One or more monomers containing unsaturated double bonds and epoxy groups, accounting for 10-20 wt% of the total weight of the functional copolymer;

[0009] (2) One or more pyrimidine monomers containing unsaturated double bonds, accounting for 5-8 wt% of the total weight of the functional copolymer;

[0010] (3) One or more borate monomers containing unsaturated double bonds, accounting for 5-8 wt% of the total weight of the functional copolymer;

[0011] (4) One or more amphoteric organic ion salt monomers containing unsaturated double bonds, accounting for 10-15 wt% of the total weight of the functional copolymer;

[0012] (5) The balance is one or more monomers containing unsaturated double bonds and multiple hydrophilic groups, based on the total weight of the functional copolymer.

[0013] Preferably, the monomer containing unsaturated double bonds and epoxy groups is 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione.

[0014] Preferably, the pyrimidine monomer containing unsaturated double bonds is 2-vinylpyrimidine.

[0015] Preferably, the borate monomer containing unsaturated double bonds is isopropenylboronic acid pinacol ester.

[0016] Preferably, the amphoteric organic ion salt monomer containing unsaturated double bonds is 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonate inner salt.

[0017] Preferably, the monomer containing unsaturated double bonds and multiple hydrophilic groups is polyethylene glycol monoallyl ether; the polyethylene glycol monoallyl ether is APEG-400, provided by Nantong Yuanlai New Materials Co., Ltd.

[0018] Preferably, the coupling agent is at least one of silane coupling agent KH560 and silane coupling agent KH550.

[0019] Preferably, there is no special requirement for the source of the water-soluble hyperbranched polyamide with terminal amino groups. In one embodiment of the present invention, the water-soluble hyperbranched polyamide with terminal amino groups is prepared by the method of Example 2 in Chinese Invention Patent CN1232567C.

[0020] Preferably, the particle size of the nano zinc oxide is 40-100 nm.

[0021] Preferably, the wetting agent is selected from at least one of nonylphenol polyoxyethylene ether NP-10 and sodium butylnaphthalene sulfonate.

[0022] Preferably, the defoaming agent is one or more of BYK052, BYK1797, and BYK381.

[0023] Preferably, the preparation method of the functional copolymer comprises the following steps: After mixing each monomer evenly to obtain a monomer mixture, then adding the monomer mixture and an initiator to a high-boiling solvent, stirring and reacting for 4-6 hours under an inert gas at 50-65 °C, then rotary evaporating to remove the solvent, adding the crude product into a dialysis bag filled with deionized water, dialyzing in deionized water for 18-24 hours, and then rotary evaporating to remove the deionized water in the dialysis bag to obtain the functional copolymer.

[0024] Preferably, the mass ratio of the monomer mixture, the initiator, and the high-boiling solvent is 1:(0.01-0.03):(3-5).

[0025] Preferably, the initiator is azobisisobutyronitrile; the high-boiling solvent is at least one of dimethyl sulfoxide, N,N-dimethylformamide, and N-methylpyrrolidone; the inert gas is any one of nitrogen, helium, neon, and argon.

[0026] Another object of the present invention is to provide a preparation method of the anti-fog coating liquid for security cameras, comprising the following steps: After mixing each component by weight evenly, the anti-fog coating liquid for security cameras is obtained.

[0027] Due to the application of the above technical solutions, the present invention has the following beneficial effects:

[0028] The anti-fog coating liquid for security cameras disclosed by the present invention is prepared from the following components in parts by weight: 30-40 parts of a functional copolymer, 3-5 parts of 1,3-bis((tris(hydroxymethyl)methylamino)propane), 1-3 parts of a coupling agent, 5-8 parts of an amino-terminated water-soluble hyperbranched polyamide, 3-6 parts of nano zinc oxide, 1-3 parts of a wetting agent, 0.8-1.2 parts of an anti-foaming agent, and 25-35 parts of water; based on the reasonable ratio of each component and their mutual cooperation, the prepared anti-fog coating liquid has a high bonding strength with the substrate surface after being coated and cured on the substrate surface, a significant anti-fog effect, and excellent weather resistance aging resistance, anti-fog performance stability and water resistance.

[0029] The functional copolymer in the anti-fog coating liquid for security cameras disclosed by the present invention includes units formed from the following monomers: based on the total weight of the functional copolymer, 10-20 wt% of one or more monomers containing unsaturated double bonds and epoxy groups; 5-8 wt% of one or more monomers containing unsaturated double bonds and pyrimidine; 5-8 wt% of one or more monomers containing unsaturated double bonds and borate esters; 10-15 wt% of one or more monomers containing unsaturated double bonds and zwitterionic organic salts; and the balance is one or more monomers containing unsaturated double bonds and multiple hydrophilic groups. Under the action of an initiator, triazine ketone, pyrimidine, borate ester, zwitterionic organic salt and hydrophilic groups are simultaneously introduced into the formed functional copolymer molecules. The anti-fog coating formed after curing by blending with other components, based on the multi-functional molecular structure design, and these structures can effectively improve the bonding strength between the anti-fog coating and the substrate surface, the anti-fog effect, the weather resistance aging resistance, the anti-fog performance stability and the water resistance under the multiple actions of electronic effects, steric effects, etc.

[0030] In the anti-fog coating liquid for security cameras disclosed by the present invention, the epoxy groups on the functional copolymer can undergo epoxy ring-opening reactions with the amino groups on 1,3-bis((tris(hydroxymethyl)methylamino)propane) and the amino-terminated water-soluble hyperbranched polyamide to be cured, making the structure of the formed anti-fog coating more stable, effectively improving the weather resistance aging resistance, performance stability and water resistance of the anti-fog coating; the components containing more hydrophilic groups such as the functional copolymer, 1,3-bis((tris(hydroxymethyl)methylamino)propane), and the amino-terminated water-soluble hyperbranched polyamide cooperate with each other to form a super-hydrophilic interface on the coating surface, which can effectively improve the anti-fog effect.

[0031] The preparation method of the anti-fog coating liquid for security cameras disclosed by the present invention is simple. Only need to mix each component evenly in parts by weight, prepare and use immediately. No complex equipment is required, and continuous large-scale production of the product can be achieved by using common coating equipment, and the qualified rate of the product is relatively high. Specific embodiments

[0032] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and other obvious variations can be conceived by those skilled in the art. Example 1

[0033] An anti-fog coating liquid for a security camera is prepared from the following components by weight: 30 parts of a functional copolymer, 3 parts of 1,3-bis((tris(hydroxymethyl)methyl)amino)propane, 1 part of a coupling agent, 5 parts of an amino-terminated water-soluble hyperbranched polyamide, 3 parts of nano-zinc oxide, 1 part of a wetting agent, 0.8 part of an antifoaming agent, and 25 parts of water; the functional copolymer includes units formed from the following monomers: based on the total weight of the functional copolymer, 10 wt% of 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione; 5 wt% of 2-vinylpyrimidine; 5 wt% of isopropenylboronic acid pinacol ester; 10 wt% of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonate inner salt; the balance is polyethylene glycol monoallyl ether; the polyethylene glycol monoallyl ether is APEG-400, provided by Nantong Yuanlai New Materials Co., Ltd.

[0034] The coupling agent is a silane coupling agent KH560; the amino-terminated water-soluble hyperbranched polyamide is prepared by the method of Example 2 in Chinese Patent No. CN1232567C; the particle size of the nano-zinc oxide is 40 nm; the wetting agent is selected from nonylphenol polyoxyethylene ether NP-10; the antifoaming agent is BYK052.

[0035] The preparation method of the functional copolymer includes the following steps: after mixing the monomers evenly to obtain a monomer mixture, then adding the monomer mixture and an initiator to a high-boiling solvent, stirring and reacting at 50 °C under an inert gas for 4 hours, then rotary evaporating to remove the solvent, adding the crude product to a dialysis bag filled with deionized water, dialyzing in deionized water for 18 hours, and then rotary evaporating to remove the deionized water in the dialysis bag to obtain the functional copolymer; the mass ratio of the monomer mixture, the initiator, and the high-boiling solvent is 1:0.01:3; the initiator is azobisisobutyronitrile; the high-boiling solvent is dimethyl sulfoxide; the inert gas is nitrogen. Through GPC testing, the M n = 14217 g / mol, M W / M n= 1.438; It was confirmed by elemental quantitative analysis that the mass ratio of the structural units introduced by 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 2-vinylpyrimidine, isopropenylboronic acid pinacol ester, 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium] propane-1-sulfonate inner salt, and polyethylene glycol monoallyl ether in the copolymer was 9.9:4.7:4.8:10:70.6.

[0036] A preparation method of the anti-fog coating liquid for the security camera includes the following steps: After mixing each component evenly by weight, the anti-fog coating liquid for the security camera is obtained. Example 2

[0037] An anti-fog coating liquid for a security camera is prepared from the following components by weight: 33 parts of a functional copolymer, 3.5 parts of 1,3-bis((tris(hydroxymethyl)methylamino)propane), 1.5 parts of a coupling agent, 6 parts of an amino-terminated water-soluble hyperbranched polyamide, 4 parts of nano-zinc oxide, 1.5 parts of a wetting agent, 0.9 parts of an antifoaming agent, and 27 parts of water; the functional copolymer includes units formed from the following monomers: based on the total weight of the functional copolymer, 13 wt% of 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione; 6 wt% of 2-vinylpyrimidine; 6 wt% of isopropenylboronic acid pinacol ester; 11 wt% of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium] propane-1-sulfonate inner salt; the balance is polyethylene glycol monoallyl ether; the polyethylene glycol monoallyl ether is APEG-400, provided by Nantong Yuanlai New Materials Co., Ltd.

[0038] The coupling agent is a silane coupling agent KH550; the amino-terminated water-soluble hyperbranched polyamide is prepared by the method of Example 2 in Chinese Invention Patent CN1232567C; the particle size of the nano-zinc oxide is 60 nm; the wetting agent is selected from sodium butylnaphthalenesulfonate; the antifoaming agent is BYK1797.

[0039] The preparation method of the functional copolymer comprises the following steps: After mixing each monomer uniformly, a monomer mixture is obtained. Then, the monomer mixture and an initiator are added to a high-boiling solvent, and stirred and reacted at 55 °C under an inert gas for 4.5 hours. Then, the solvent is removed by rotary evaporation. The crude product is added to a dialysis bag filled with deionized water and dialyzed in deionized water for 19 hours. Then, the deionized water in the dialysis bag is removed by rotary evaporation to obtain the functional copolymer; the mass ratio of the monomer mixture, the initiator, and the high-boiling solvent is 1:0.015:3.5; the initiator is azobisisobutyronitrile; the high-boiling solvent is N,N-dimethylformamide; the inert gas is helium.

[0040] The preparation method of an anti-fog coating liquid for the security camera comprises the following steps: After mixing each component by weight uniformly, an anti-fog coating liquid for the security camera is obtained. Example 3

[0041] An anti-fog coating liquid for a security camera is prepared from the following components by weight: 35 parts of a functional copolymer, 4 parts of 1,3-bis((tris(hydroxymethyl)methyl)amino)propane, 2 parts of a coupling agent, 6.5 parts of an amino-terminated water-soluble hyperbranched polyamide, 4.5 parts of nano-zinc oxide, 2 parts of a wetting agent, 1 part of an anti-foaming agent, and 30 parts of water; the functional copolymer comprises units formed from the following monomers: based on the total weight of the functional copolymer, 15 wt% of 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione; 6.5 wt% of 2-vinylpyrimidine; 6.5 wt% of isopropenylboronic acid pinacol ester; 13 wt% of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonate inner salt; the balance is polyethylene glycol monoallyl ether; the polyethylene glycol monoallyl ether is APEG-400, provided by Nantong Yuanlai New Materials Co., Ltd.

[0042] The coupling agent is a silane coupling agent KH560; the amino-terminated water-soluble hyperbranched polyamide is prepared by the method of Example 2 in Chinese Invention Patent CN1232567C; the particle size of the nano-zinc oxide is 70 nm; the wetting agent is selected from nonylphenol polyoxyethylene ether NP-10; the anti-foaming agent is BYK381.

[0043] The preparation method of the functional copolymer comprises the following steps: after mixing each monomer uniformly to obtain a monomer mixture, adding the monomer mixture and an initiator into a high-boiling solvent, stirring and reacting at 58 °C under an inert gas for 5 hours, then removing the solvent by rotary evaporation, adding the crude product into a dialysis bag filled with deionized water, dialyzing in deionized water for 21 hours, and then removing the deionized water in the dialysis bag by rotary evaporation to obtain the functional copolymer; the mass ratio of the monomer mixture, the initiator, and the high-boiling solvent is 1:0.02:4; the initiator is azobisisobutyronitrile; the high-boiling solvent is N-methylpyrrolidone; the inert gas is neon.

[0044] A preparation method of the anti-fog coating liquid for the security camera comprises the following steps: after mixing each component by weight uniformly, obtaining the anti-fog coating liquid for the security camera. Example 4

[0045] An anti-fog coating liquid for a security camera is made of the following components by weight: 38 parts of a functional copolymer, 4.5 parts of 1,3-bis((tris(hydroxymethyl)methyl)amino)propane, 2.5 parts of a coupling agent, 7.5 parts of an amino-terminated water-soluble hyperbranched polyamide, 5.5 parts of nano-zinc oxide, 2.5 parts of a wetting agent, 1.1 parts of an antifoaming agent, and 33 parts of water; the functional copolymer comprises units formed by the following monomers: based on the total weight of the functional copolymer, 18 wt% of 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione; 7.5 wt% of 2-vinylpyrimidine; 7.5 wt% of isopropenylboronic acid pinacol ester; 14 wt% of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonate inner salt; the balance is polyethylene glycol monoallyl ether; the polyethylene glycol monoallyl ether is APEG-400, provided by Nantong Yuanlai New Materials Co., Ltd.

[0046] The coupling agent is a mixture formed by mixing silane coupling agent KH560 and silane coupling agent KH550 in a mass ratio of 1:3; the amino-terminated water-soluble hyperbranched polyamide is prepared by the method of Example 2 in Chinese Invention Patent CN1232567C; the particle size of the nano-zinc oxide is 90 nm; the wetting agent is a mixture formed by mixing nonylphenol polyoxyethylene ether NP-10 and sodium butylnaphthalenesulfonate in a mass ratio of 2:3; the antifoaming agent is a mixture formed by mixing BYK052, BYK1797, and BYK381 in a mass ratio of 1:2:3.

[0047] The preparation method of the functional copolymer comprises the following steps: after mixing each monomer uniformly to obtain a monomer mixture, adding the monomer mixture and an initiator into a high-boiling solvent, stirring and reacting at 63 °C under an inert gas for 5.5 hours, then removing the solvent by rotary evaporation, adding the crude product into a dialysis bag filled with deionized water, dialyzing in deionized water for 23 hours, and then removing the deionized water in the dialysis bag by rotary evaporation to obtain the functional copolymer; the mass ratio of the monomer mixture, the initiator and the high-boiling solvent is 1:0.025:4.5; the initiator is azobisisobutyronitrile; the high-boiling solvent is a mixture formed by mixing dimethyl sulfoxide, N,N-dimethylformamide and N-methylpyrrolidone in a mass ratio of 1:3:5; the inert gas is argon.

[0048] The preparation method of an anti-fog coating liquid for the security camera comprises the following steps: after mixing each component by weight uniformly, an anti-fog coating liquid for the security camera is obtained. Example 5

[0049] An anti-fog coating liquid for a security camera is prepared from the following components by weight: 40 parts of a functional copolymer, 5 parts of 1,3-bis((tris(hydroxymethyl)methyl)amino)propane, 3 parts of a coupling agent, 8 parts of an amino-terminated water-soluble hyperbranched polyamide, 6 parts of nano-zinc oxide, 3 parts of a wetting agent, 1.2 parts of an antifoaming agent, and 35 parts of water; the functional copolymer comprises units formed from the following monomers: based on the total weight of the functional copolymer, 20 wt% of 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione; 8 wt% of 2-vinylpyrimidine; 8 wt% of isopropenylboronic acid pinacol ester; 15 wt% of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonate inner salt; the balance is polyethylene glycol monoallyl ether; the polyethylene glycol monoallyl ether is APEG-400 provided by Nantong Yuanlai New Materials Co., Ltd.

[0050] The coupling agent is a silane coupling agent KH560; the amino-terminated water-soluble hyperbranched polyamide is prepared by the method of Example 2 in Chinese Invention Patent CN1232567C; the particle size of the nano-zinc oxide is 100 nm; the wetting agent is selected from nonylphenol polyoxyethylene ether NP-10; the antifoaming agent is BYK052.

[0051] The preparation method of the functional copolymer comprises the following steps: After mixing each monomer evenly, a monomer mixture is obtained. Then, the monomer mixture and an initiator are added to a high-boiling solvent, and stirred and reacted at 65 °C under an inert gas for 6 hours. Then, the solvent is removed by rotary evaporation. The crude product is added to a dialysis bag filled with deionized water and dialyzed in deionized water for 24 hours. Then, the deionized water in the dialysis bag is removed by rotary evaporation to obtain the functional copolymer; the mass ratio of the monomer mixture, the initiator, and the high-boiling solvent is 1:0.03:5; the initiator is azobisisobutyronitrile; the high-boiling solvent is N,N-dimethylformamide; the inert gas is argon.

[0052] A preparation method of an anti-fog coating liquid for the security camera comprises the following steps: After mixing each component evenly by weight, an anti-fog coating liquid for the security camera is obtained.

[0053] Comparative Example 1

[0054] An anti-fog coating liquid for a security camera is basically the same as that in Example 1, except that 2-vinylpyrimidine and 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium] propane-1-sulfonate inner salt are not added.

[0055] Comparative Example 2

[0056] An anti-fog coating liquid for a security camera is basically the same as that in Example 1, except that isopropenylboronic acid pinacol ester and terminal amino water-soluble hyperbranched polyamide are not added.

[0057] In order to further illustrate the beneficial technical effects of the anti-fog coating liquid for the security camera involved in each embodiment of the present invention, relevant performance tests are carried out on the anti-fog coating liquids for the security camera involved in Examples 1-5 and Comparative Examples 1-2. The test results are shown in Table 1, and the test methods are as follows:

[0058] Adhesion: Determined with reference to the national standard GB / T 9286-2021 "Cross-cut test for paints and varnishes films".

[0059] Anti-fogging property: The above anti-fog coating liquid was applied to a polycarbonate resin plate by spraying method, so that the thickness of the cured coating film was 3 μm. After drying at 40 °C for 5 minutes, it was heated and cured at 110 °C for 30 minutes to obtain a coating film test piece. The coating film test piece was set at a height of 5 cm from the water surface of a warm water bath maintained at 80 °C, with the coating film surface of the test piece facing downwards, and the steam generated from the warm water bath was continuously irradiated on the coating film. After 10 seconds of irradiation, it was observed with the naked eye whether fogging occurred, and then the evaluation was carried out according to the following five levels: ◎ It is not considered that fogging occurs at all; ○ After irradiation with steam, fogging only slightly appears instantaneously, and then it is not considered that fogging occurs; △ It is considered that there is a little fogging, or it is not considered that fogging occurs, but the surface of the coating film is not smooth and is rough; × It is significantly considered that fogging occurs; ×× Due to insufficient curing of the coating film, after irradiation with steam, the coating film immediately turns white.

[0060] Weather resistance and aging resistance: Each coating film test piece was placed in an environment of 80 °C × 85% RH for 300 hours. After cooling to room temperature, the anti-fogging property test was carried out according to the above test method for anti-fogging property.

[0061] Water resistance: Each coating film test piece was immersed in tap water at 25 °C for 10 days. If there was no peeling or bubbling of the coating, the water resistance passed, otherwise it did not pass.

[0062] As can be seen from Table 1, the coating formed by curing the anti-fog coating liquid for security cameras disclosed in the embodiments of the present invention has more excellent anti-fogging performance, weather resistance and aging resistance, adhesion and water resistance than the comparative examples. The addition of 2-vinylpyrimidine, 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium] propane-1-sulfonate inner salt, isopropenylboronic acid pinacol ester and amino-terminated water-soluble hyperbranched polyamide is beneficial to improving the above properties.

[0063]

[0064] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-fog coating liquid for a security camera, characterized in that, By weight parts, it is made of the following components: 30-40 parts of functional copolymer, 3-5 parts of 1,3-bis((tris(hydroxymethyl)methyl)amino)propane, 1-3 parts of coupling agent, 5-8 parts of amino-terminated water-soluble hyperbranched polyamide, 3-6 parts of nano-zinc oxide, 1-3 parts of wetting agent, 0.8-1.2 parts of defoaming agent, and 25-35 parts of water; the functional copolymer includes units formed from the following monomers: (1) 1,3-bis(oxiranylmethyl)-5-(2-propenyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 10-20 wt% based on the total weight of the functional copolymer; (2) 2-vinylpyrimidine, 5-8 wt% based on the total weight of the functional copolymer; (3) Isopropenylboronic acid pinacol ester, 5-8 wt% based on the total weight of the functional copolymer; (4) 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonate inner salt, 10-15 wt% based on the total weight of the functional copolymer; (5) The balance is polyethylene glycol monoallyl ether; the polyethylene glycol monoallyl ether is APEG-400 based on the total weight of the functional copolymer.

2. The anti-fog coating liquid for security cameras according to claim 1, wherein The coupling agent is at least one of silane coupling agent KH560 and silane coupling agent KH550; the particle size of the nano-zinc oxide is 40-100 nm.

3. The anti-fog coating liquid for security cameras according to claim 1, characterized in that, The wetting agent is selected from at least one of nonylphenol polyoxyethylene ether NP-10 and sodium butylnaphthalenesulfonate; the defoaming agent is one or more of BYK052, BYK1797, and BYK381.

4. The anti-fog coating liquid for security cameras according to any one of claims 1 to 3, characterized in that The preparation method of the functional copolymer includes the following steps: After mixing each monomer evenly to obtain a monomer mixture, then adding the monomer mixture and an initiator to a high-boiling solvent, stirring and reacting at 50-65 °C under an inert gas for 4-6 hours, then rotary evaporating to remove the solvent, adding the crude product to a dialysis bag filled with deionized water, dialyzing in deionized water for 18-24 hours, and then rotary evaporating to remove the deionized water in the dialysis bag to obtain the functional copolymer.

5. The anti-fog coating liquid for a security camera according to claim 4, characterized in that, The mass ratio of the monomer mixture, initiator, and high-boiling solvent is 1:(0.01-0.03):(3-5); the initiator is azobisisobutyronitrile; the high-boiling solvent is at least one of dimethyl sulfoxide, N,N-dimethylformamide, and N-methylpyrrolidone; the inert gas is any one of nitrogen, helium, neon, and argon.

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