Insulating weather-resistant coating and preparation method thereof

Abstract

The invention relates to the technical field of coatings, and discloses an insulating weather-resistant coating and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing silicon modified epoxy resin, a sulfydryl titanium dioxide / hexagonal boron nitride composite material, o-diallyl bisphenol A epoxy resin, chalcone block polyether sulfone, fluorine modified polyether amine, a solvent and a photoinitiator to obtain the insulating weather-resistant coating, the coating has a photo-thermal dual-curing mechanism, a cross-linked network is easily formed after curing, and the insulating weather-resistant coating has a good weather-resistant effect. The insulation property and the weather resistance are excellent, and the water resistance and the mechanical property are good.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to an insulating weather-resistant coating and a preparation method thereof. Background Art

[0002] Insulating coatings are applied to the surface of devices to form insulating films, providing insulating protection for the devices. Insulating coatings will inevitably be affected by various factors in the environment during use. Therefore, in addition to the insulating function, insulating coatings should also have good comprehensive performance. Epoxy resin can generate a three-dimensional network structure after high-temperature cross-linking and curing. It has good mechanical properties, chemical resistance and electrical insulation, and is widely used in many fields; however, pure epoxy resin-based coatings have gradually failed to meet the requirements of various application fields after curing. In order to make epoxy resin-based coatings obtain various excellent properties, it is necessary to improve the insulation and corrosion resistance of epoxy resin-based coatings while ensuring the excellent adhesion, heat resistance and good mechanical properties of epoxy resin.

[0003] Prior art such as Chinese patent application CN101967335A discloses a breakdown-resistant insulating coating, in which silicone epoxy resin is mixed with fillers, solvents, and additives and then added into a stock register. The resulting coating has excellent comprehensive properties, but the insulating breakdown-resistant filler used in the prepared coating has poor compatibility with the matrix resin, which affects the mechanical properties of the coating after curing. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an insulating weather-resistant coating and a preparation method thereof. The coating has a dual photothermal curing mechanism, is easy to form a cross-linked network after curing, has excellent insulation and weather resistance, and has good water resistance and mechanical properties.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A method for preparing an insulating weather-resistant coating comprises the following steps:

[0007] Step 1, preparing chalcone-block polyethersulfone and fluorine-modified polyetheramine;

[0008] Wherein, the chalcone block polyether sulfone is prepared by the following steps:

[0009] (E)-1,3-bis(4-hydroxyphenyl)-2-propene-1-one, 2,2-bis(4-hydroxyphenyl)propane, 4,4'-difluorodiphenyl sulfone, dimethylacetamide, toluene and potassium carbonate are mixed and stirred to react, and after the reaction is completed, the reaction is continued, and after the reaction is completed, the mixture is cooled, purified and dried to obtain a chalcone block polyether sulfone;

[0010] Wherein, the fluorine-modified polyetheramine is prepared by the following steps:

[0011] The perfluoropolyether alcohol, p-toluenesulfonyl chloride, dichloromethane and triethylamine are mixed and stirred to react, and after the reaction is completed, the reaction is purified to obtain a reaction product; the reaction product is mixed with a polyetheramine, and the reaction is continued, and after the reaction is completed, the reaction is purified again to obtain a fluorine-modified polyetheramine;

[0012] Step 2: Mix and dissolve the epoxy resin, n-butanol, propylene glycol methyl ether, and the first initiator, add the second initiator and vinyl trimethoxysilane, react, cool after the reaction, and remove the solvent by rotary evaporation to obtain a silicon-modified epoxy resin;

[0013] The silicon-modified epoxy resin, the mercapto titanium dioxide / hexagonal boron nitride composite material and the o-bisallyl bisphenol A epoxy resin are mixed, and dimethylacetamide, chalcone block polyether sulfone, fluorine-modified polyether amine and a photoinitiator are added and mixed evenly to obtain an insulating weather-resistant coating;

[0014] Wherein, the mercapto titanium dioxide / hexagonal boron nitride composite material is prepared by the following steps:

[0015] The hexagonal boron nitride is mixed with ethanol, ultrasonically dispersed, a precursor solution is added dropwise, and after the addition is completed, the reaction is carried out. After the reaction is completed, the titanium dioxide / hexagonal boron nitride composite material is dried, calcined, and cooled to obtain a titanium dioxide / hexagonal boron nitride composite material; the titanium dioxide / hexagonal boron nitride composite material is mixed with toluene, ultrasonically dispersed, γ-mercaptopropyltrimethoxysilane is added, and the reaction is carried out. After the reaction is completed, the solution is filtered, washed, and dried to obtain a mercapto titanium dioxide / hexagonal boron nitride composite material.

[0016] Preferably, in the step 1 for preparing chalcone-block polyethersulfone, the mass ratio of (E)-1,3-bis(4-hydroxyphenyl)-2-propene-1-one, 2,2-bis(4-hydroxyphenyl)propane, 4,4'-difluorodiphenyl sulfone, dimethylacetamide, toluene and potassium carbonate is 2.5-2.7:6.8-7:10-10.1:90-120:40-50:11-11.5; the reaction conditions are: reacting in a nitrogen atmosphere at a temperature of 130-140° C. for 4-5 hours; and the continued reaction conditions are: continuing the reaction in a nitrogen atmosphere at a temperature of 140-150° C. for 7-8 hours.

[0017] Preferably, when preparing chalcone block polyethersulfone in step 1, the purification operation includes: taking the reaction product obtained after cooling, adding 1wt% acetic acid aqueous solution with a mass of 8-10 times the mass of the reaction product for precipitation, filtering, taking the filter cake, and adding water and methanol with a mass of 5-8 times the mass of the filter cake for washing.

[0018] Preferably, when preparing the fluorine-modified polyetheramine in step 1, the mass ratio of perfluoropolyether alcohol, p-toluenesulfonyl chloride, dichloromethane and triethylamine is 5:1.3-1.4:10-15:0.7-0.73; the reaction conditions are: reacting at a temperature of 50-60°C for 1-2h; the mass ratio of the reaction product to the polyetheramine is 4.5:2.5-2.8; and the continued reaction conditions are: continuing the reaction at a temperature of 95-105°C for 12-14h.

[0019] Preferably, when preparing the fluorine-modified polyetheramine in step 1, the purification operation includes: when preparing the reaction product, in the crude reaction product obtained after the reaction, ethanol and trichlorotrifluoroethane in amounts of 4-5 times the mass of the crude reaction product are added in sequence for washing, then 1 mol / L aqueous hydrogen chloride solution is added to neutralize to neutrality, and finally 4-5 times the mass of water of the crude reaction product is added, the liquids are separated, the organic phase is taken, and the solvent is removed by rotary evaporation at a temperature of 30-40°C; the re-purification operation includes: when preparing the fluorine-modified polyetheramine, in the crude reaction product obtained after the reaction, ethanol, trichlorotrifluoroethane and water in amounts of 4-5 times the mass of the crude reaction product are added in sequence for washing, then 4-5 times the mass of the crude reaction product is added with dichloromethane, the liquids are separated, the organic phase is taken, and the solvent is removed by rotary evaporation at a temperature of 30-40°C.

[0020] Preferably, when preparing the silicon-modified epoxy resin in step 2: the mass ratio of epoxy resin, n-butanol, propylene glycol methyl ether, the first initiator, the second initiator, and vinyl trimethoxy silane is 45-48:30-40:30-40:0.7-0.8:1.3-1.4:1.5-1.8, and the first initiator and the second initiator are both benzoyl peroxide; the reaction conditions are: reacting in a nitrogen atmosphere at a temperature of 110-120°C for 4-5h.

[0021] Preferably, when preparing the insulating weather-resistant coating in step 2: the mass ratio of silicon-modified epoxy resin, mercapto titanium dioxide / hexagonal boron nitride composite material, o-bisallyl bisphenol A epoxy resin, dimethylacetamide, chalcone block polyether sulfone, fluorine-modified polyether amine, and photoinitiator is 80:3-6:20-30:10-15:15-20:25-30:3-4.

[0022] Preferably, in the step 2 of preparing the mercapto titanium dioxide / hexagonal boron nitride composite material: the mass ratio of hexagonal boron nitride, ethanol, and precursor solution is 5:130-150:8-8.5, the precursor solution is prepared by mixing and dissolving ethanol, acetic acid, and tetrabutyl titanate in a mass ratio of 30-35:2-3:10-12, and the dropping time is 15-20min; when preparing the titanium dioxide / hexagonal boron nitride composite material, the reaction conditions are: stirring the reaction at room temperature for 5-6h; the calcination conditions are: placing in a muffle furnace and calcining at 450-500°C for 2.5-3h.

[0023] Preferably, in the step 2, when preparing the mercapto titanium dioxide / hexagonal boron nitride composite material, the mass ratio of the titanium dioxide / hexagonal boron nitride composite material, toluene, and γ-mercaptopropyltrimethoxysilane is 10:180-220:70-75; when preparing the mercapto titanium dioxide / hexagonal boron nitride composite material, the reaction conditions are: reacting at a temperature of 50-60°C for 4-6h.

[0024] Preferably, an insulating weather-resistant coating is prepared using the insulating weather-resistant coating preparation method as described above.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention prepares silicon-modified epoxy resin, and adds therein o-bisallyl bisphenol A epoxy resin having a carbon-carbon double bond in the side chain, mercapto titanium dioxide / hexagonal boron nitride composite material, chalcone block polyether sulfone, fluorine-modified polyether amine, solvent and photoinitiator, so as to obtain an insulating weather-resistant coating. The coating has a light-heat dual curing mechanism, is easy to form a cross-linked network after curing, has excellent insulation and weather resistance, and is good in water resistance and mechanical properties.

[0027] The epoxy resin monomer is an epoxy oligomer, and its molecular chain contains two or more epoxy groups. After reacting with a curing agent and curing, a cross-linked network cured product is formed, and the weather resistance and insulation properties are excellent. The present invention mixes the epoxy resin with vinyl trimethoxy silane, and uses the carbon-carbon double bond of the vinyl trimethoxy silane to react with the active hydrogen atoms in the epoxy resin under the condition of an initiator, so that the siloxane chain segment is grafted on the side chain of the epoxy resin. The obtained silicon-modified epoxy resin has excellent hydrophobic properties. At the same time, the siloxane chain segment as a flexible chain segment reduces the brittleness of the epoxy resin matrix, improves the flexibility, and improves the comprehensive mechanical properties of the epoxy resin.

[0028] The invention uses (E)-1,3-bis(4-hydroxyphenyl)-2-propene-1-one having a chalcone structure as a reaction monomer, and 2,2-bis(4-hydroxyphenyl)propane and 4,4'-difluorodiphenyl sulfone to undergo polycondensation reaction under the action of a catalyst to obtain a chalcone block polyether sulfone having a chalcone structure in the main chain; uses an ester exchange reaction to react perfluoropolyether alcohol with p-toluenesulfonyl chloride to generate a reaction product containing sulfonate, and further reacts the sulfonate group in the reaction product with the amino group of the polyetheramine to obtain a fluorine-modified polyetheramine; adds the chalcone block polyethersulfone, the fluorine-modified polyetheramine, the mercapto titanium dioxide / hexagonal boron nitride composite material and the o-bisallyl bisphenol A epoxy resin as functional components into a silicon-modified epoxy resin, and then adds a solvent and a photoinitiator to obtain an insulating weather-resistant coating;

[0029] Among them, the chalcone structure of the chalcone block polyether sulfone undergoes a photodimerization cross-linking reaction of the carbon-carbon double bonds in the α, β-unsaturated carbonyl group under ultraviolet light irradiation to form a heat-resistant and corrosion-resistant network structure. When it is added to the epoxy resin matrix, the chalcone group can be introduced to construct a light-heat dual-curing system, increase the degree of cross-linking, and improve the corrosion and weather resistance of the coating matrix; the fluorine-modified polyether amine contains fluorine atoms, which improves the hydrophobicity of the matrix while also improving its insulation performance, and the terminal amino group of the fluorine-modified polyether amine and the terminal hydroxyl group in the chalcone block polyether sulfone can react with the epoxy group of the epoxy resin, and act as a curing agent to promote the curing of the epoxy resin matrix during thermal curing, thereby increasing the degree of cross-linking;

[0030] The mercapto titanium dioxide / hexagonal boron nitride composite material is prepared by using hexagonal boron nitride as a carrier, loading titanium dioxide particles on its surface through a sol-gel method, and surface-modifying the obtained titanium dioxide / hexagonal boron nitride with γ-mercaptopropyltrimethoxysilane. Since hexagonal boron nitride has excellent insulation properties and titanium dioxide has good anti-ultraviolet properties, the two are compositely surface-modified and introduced into the coating. The mercapto titanium dioxide / hexagonal boron nitride composite material can be uniformly dispersed in the coating matrix, constructing a maze for the corrosive medium in the coating matrix, limiting the invasion of the corrosive medium, and improving the insulation performance and corrosion resistance and weather resistance of the coating.

[0031] In addition, the mercapto functional groups on the surface of the mercapto titanium dioxide / hexagonal boron nitride composite material can participate in the dual curing process of the coating, reacting with both carbon-carbon double bonds and epoxy groups, further increasing the crosslinking degree of the coating matrix and improving the mechanical properties and corrosion and weather resistance of the coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a process flow chart for preparing the insulating weather-resistant coating in the present invention;

[0033] Figure 2 It is a bar graph of the impact strength of the coatings prepared in the embodiments and comparative examples of the present invention in performance tests. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] Example 1

[0036] This embodiment discloses a method for preparing an insulating weather-resistant coating, comprising the following steps:

[0037] Step 1, preparing chalcone-block polyethersulfone and fluorine-modified polyetheramine;

[0038] Wherein, the chalcone block polyether sulfone is prepared by the following steps:

[0039] (E)-1,3-bis(4-hydroxyphenyl)-2-propene-1-one, 2,2-bis(4-hydroxyphenyl)propane, 4,4'-difluorodiphenyl sulfone, dimethylacetamide, toluene and potassium carbonate were mixed and stirred at a mass ratio of 2.5:7:10:90:40:11 at room temperature for 20 minutes, reacted at 130°C for 5 hours in a nitrogen atmosphere, and continued to react at 140°C for 8 hours after the reaction. After the reaction, the mixture was cooled to room temperature to obtain a reaction product, and a 1wt% acetic acid aqueous solution with a mass of 8 times that of the reaction product was added for precipitation, filtered, and a filter cake was taken, and water and methanol with a mass of 5 times that of the filter cake were added in sequence for washing, and dried at 50°C for 28 hours to obtain a chalcone block polyether sulfone;

[0040] Wherein, the fluorine-modified polyetheramine is prepared by the following steps:

[0041] Perfluoropolyether alcohol, p-toluenesulfonyl chloride, dichloromethane and triethylamine were mixed in a mass ratio of 5:1.3:10:0.7, stirred at room temperature for 1.5 hours, reacted at 50°C for 2 hours, and purified after the reaction to obtain a reaction product; the reaction product was mixed with polyetheramine in a mass ratio of 4.5:2.5, and continued to react at 95°C for 14 hours. After the reaction, it was purified again to obtain a fluorine-modified polyetheramine;

[0042] The purification operation includes: when preparing the reaction product, in the crude reaction product obtained after the reaction is completed, ethanol and trichlorotrifluoroethane are added in sequence in an amount of 4 times the mass of the crude reaction product for washing, and then 1 mol / L aqueous hydrogen chloride solution is added to neutralize to neutrality, and finally water is added in an amount of 4 times the mass of the crude reaction product, liquid separation is performed, an organic phase is taken, and the solvent is removed by rotary evaporation at a temperature of 30°C; the re-purification operation includes: when preparing the fluorine-modified polyetheramine, in the crude reaction product obtained after the reaction is completed, ethanol, trichlorotrifluoroethane and water are added in sequence in an amount of 4 times the mass of the crude reaction product for washing, and then dichloromethane is added in an amount of 4 times the mass of the crude reaction product, liquid separation is performed, an organic phase is taken, and the solvent is removed by rotary evaporation at a temperature of 30°C;

[0043] Step 2, the epoxy resin, n-butanol, propylene glycol methyl ether, and the first initiator are mixed and dissolved in a nitrogen atmosphere at a temperature of 50°C, the second initiator and vinyl trimethoxy silane are added, and the reaction is carried out at a temperature of 110°C for 5 hours. After the reaction is completed, it is cooled to room temperature, and the solvent is removed by rotary evaporation at a temperature of 80°C to obtain a silicon-modified epoxy resin; wherein the first initiator and the second initiator are both benzoyl peroxide, and the mass ratio of the epoxy resin, n-butanol, propylene glycol methyl ether, the first initiator, the second initiator, and vinyl trimethoxy silane is 45:30:30:0.7:1.3:1.5;

[0044] The silicon-modified epoxy resin, the mercapto titanium dioxide / hexagonal boron nitride composite material, and the o-bisallyl bisphenol A epoxy resin are mixed at a temperature of 35° C. for 40 minutes, and dimethylacetamide, chalcone block polyether sulfone, fluorine-modified polyether amine, and a photoinitiator are added under light-proof conditions and continue to be mixed evenly, and the mass ratio of the silicon-modified epoxy resin, the mercapto titanium dioxide / hexagonal boron nitride composite material, the o-bisallyl bisphenol A epoxy resin, dimethylacetamide, chalcone block polyether sulfone, fluorine-modified polyether amine, and the photoinitiator is 80:3:20:10:15:25:3 to obtain an insulating weather-resistant coating;

[0045] Wherein, the mercapto titanium dioxide / hexagonal boron nitride composite material is prepared by the following steps:

[0046] Mix hexagonal boron nitride with ethanol, ultrasonically disperse for 14 hours, and drop a precursor solution, wherein the precursor solution is prepared by mixing and dissolving ethanol, acetic acid, and tetrabutyl titanate in a mass ratio of 33:2.5:11, and the mass ratio of hexagonal boron nitride, ethanol, and precursor solution is 5:140:8.3. The dropping time is 20 minutes. After the dropping is completed, stir and react at room temperature for 5.5 hours. After the reaction is completed, dry at 75°C for 14 hours, place in a muffle furnace at 480°C for calcination for 3 hours, and cool to room temperature after calcination to obtain a titanium dioxide / hexagonal boron nitride composite material;

[0047] The titanium dioxide / hexagonal boron nitride composite material was mixed with toluene, ultrasonically dispersed for 25 minutes, and γ-mercaptopropyltrimethoxysilane was added. The mass ratio of the titanium dioxide / hexagonal boron nitride composite material, toluene and γ-mercaptopropyltrimethoxysilane was 10:200:73. The reaction was carried out at 55°C for 5 hours. After the reaction was completed, the filter cake was filtered and washed three times with toluene 6 times the mass of the filter cake. The mixture was dried at 95°C for 5 hours to obtain a mercapto titanium dioxide / hexagonal boron nitride composite material.

[0048] Example 2

[0049] This embodiment discloses a method for preparing an insulating weather-resistant coating, comprising the following steps:

[0050] Step 1, preparing chalcone-block polyethersulfone and fluorine-modified polyetheramine;

[0051] Wherein, the chalcone block polyether sulfone is prepared by the following steps:

[0052] (E)-1,3-bis(4-hydroxyphenyl)-2-propene-1-one, 2,2-bis(4-hydroxyphenyl)propane, 4,4'-difluorodiphenyl sulfone, dimethylacetamide, toluene and potassium carbonate were mixed and stirred at a mass ratio of 2.55:6.85:10:95:45:11.3 at room temperature for 25 minutes, reacted at 130°C for 4.5 hours in a nitrogen atmosphere, and continued to react at 140°C for 7.5 hours after the reaction. After the reaction, the mixture was cooled to room temperature to obtain a reaction product, and a 1wt% acetic acid aqueous solution with a mass of 8 times that of the reaction product was added for precipitation, filtered, and a filter cake was taken, and water and methanol with a mass of 6 times that of the filter cake were added in sequence for washing, and dried at 55°C for 26 hours to obtain a chalcone block polyether sulfone;

[0053] Wherein, the fluorine-modified polyetheramine is prepared by the following steps:

[0054] Perfluoropolyether alcohol, p-toluenesulfonyl chloride, dichloromethane and triethylamine were mixed in a mass ratio of 5:1.33:12:0.71, stirred at room temperature for 1.5 hours, reacted at 50°C for 1.5 hours, and purified after the reaction to obtain a reaction product; the reaction product was mixed with polyetheramine in a mass ratio of 4.5:2.6, and continued to react at 95°C for 13 hours. After the reaction was completed, it was purified again to obtain a fluorine-modified polyetheramine;

[0055] The purification operation includes: when preparing the reaction product, in the crude reaction product obtained after the reaction is completed, ethanol and trichlorotrifluoroethane are added in sequence in an amount of 4 times the mass of the crude reaction product for washing, and then 1 mol / L aqueous hydrogen chloride solution is added to neutralize to neutrality, and finally water is added in an amount of 4 times the mass of the crude reaction product, liquid separation is performed, an organic phase is taken, and the solvent is removed by rotary evaporation at a temperature of 35°C; the re-purification operation includes: when preparing the fluorine-modified polyetheramine, in the crude reaction product obtained after the reaction is completed, ethanol, trichlorotrifluoroethane and water are added in sequence in an amount of 4 times the mass of the crude reaction product for washing, and then dichloromethane is added in an amount of 4 times the mass of the crude reaction product, liquid separation is performed, an organic phase is taken, and the solvent is removed by rotary evaporation at a temperature of 35°C;

[0056] Step 2, the epoxy resin, n-butanol, propylene glycol methyl ether, and the first initiator are mixed and dissolved in a nitrogen atmosphere at a temperature of 55°C, the second initiator and vinyl trimethoxy silane are added, and the reaction is carried out at a temperature of 110°C for 4.5 hours. After the reaction is completed, it is cooled to room temperature, and the solvent is removed by rotary evaporation at a temperature of 80°C to obtain a silicon-modified epoxy resin; wherein the first initiator and the second initiator are both benzoyl peroxide, and the mass ratio of the epoxy resin, n-butanol, propylene glycol methyl ether, the first initiator, the second initiator, and vinyl trimethoxy silane is 46:35:35:0.73:1.33:1.6;

[0057] The silicon-modified epoxy resin, the mercapto titanium dioxide / hexagonal boron nitride composite material, and the o-bisallyl bisphenol A epoxy resin were mixed at 40°C for 35 minutes, and dimethylacetamide, chalcone block polyether sulfone, fluorine-modified polyether amine, and a photoinitiator were added under light-proof conditions and continued to mix evenly. The mass ratio of the silicon-modified epoxy resin, the mercapto titanium dioxide / hexagonal boron nitride composite material, the o-bisallyl bisphenol A epoxy resin, dimethylacetamide, chalcone block polyether sulfone, fluorine-modified polyether amine, and the photoinitiator was 80:4:23:11:16:26:3.3. The preparation of the mercapto titanium dioxide / hexagonal boron nitride composite material was the same as in Example 1 to obtain an insulating weather-resistant coating.

[0058] Example 3

[0059] This embodiment discloses a method for preparing an insulating weather-resistant coating, comprising the following steps:

[0060] Step 1, preparing chalcone-block polyethersulfone and fluorine-modified polyetheramine;

[0061] Wherein, the chalcone block polyether sulfone is prepared by the following steps:

[0062] (E)-1,3-bis(4-hydroxyphenyl)-2-propene-1-one, 2,2-bis(4-hydroxyphenyl)propane, 4,4'-difluorodiphenyl sulfone, dimethylacetamide, toluene and potassium carbonate were mixed and stirred at a mass ratio of 2.6:6.9:10.05:105:45:11.3 at room temperature for 25 minutes, reacted at 135°C for 4.5 hours in a nitrogen atmosphere, and continued to react at 145°C for 7.5 hours after the reaction. After the reaction, the mixture was cooled to room temperature to obtain a reaction product, and a 1wt% acetic acid aqueous solution with a mass of 9 times that of the reaction product was added for precipitation, filtered, and a filter cake was taken, and water and methanol with a mass of 6 times that of the filter cake were added in sequence for washing, and dried at 55°C for 26 hours to obtain a chalcone block polyether sulfone;

[0063] Wherein, the fluorine-modified polyetheramine is prepared by the following steps:

[0064] Perfluoropolyether alcohol, p-toluenesulfonyl chloride, dichloromethane and triethylamine were mixed in a mass ratio of 5:1.35:13:0.72, stirred at room temperature for 1.8 hours, reacted at 55°C for 1.5 hours, and purified after the reaction to obtain a reaction product; the reaction product was mixed with polyetheramine in a mass ratio of 4.5:2.65, and continued to react at 100°C for 13 hours. After the reaction was completed, it was purified again to obtain a fluorine-modified polyetheramine;

[0065] The purification operation includes: when preparing the reaction product, in the crude reaction product obtained after the reaction is completed, ethanol and trichlorotrifluoroethane in an amount of 4.5 times the mass of the crude reaction product are added in sequence for washing, and then 1 mol / L aqueous hydrogen chloride solution is added to neutralize to neutrality, and finally water in an amount of 4.5 times the mass of the crude reaction product is added, liquid separation is performed, an organic phase is taken, and the solvent is removed by rotary evaporation at a temperature of 35°C; the re-purification operation includes: when preparing the fluorine-modified polyetheramine, in the crude reaction product obtained after the reaction is completed, ethanol, trichlorotrifluoroethane and water in an amount of 4.5 times the mass of the crude reaction product are added in sequence for washing, and then dichloromethane in an amount of 4.5 times the mass of the crude reaction product is added, liquid separation is performed, an organic phase is taken, and the solvent is removed by rotary evaporation at a temperature of 35°C;

[0066] Step 2, the epoxy resin, n-butanol, propylene glycol methyl ether, and the first initiator are mixed and dissolved in a nitrogen atmosphere at a temperature of 55°C, the second initiator and vinyl trimethoxy silane are added, and the reaction is carried out at a temperature of 115°C for 4.5 hours. After the reaction is completed, it is cooled to room temperature, and the solvent is removed by rotary evaporation at a temperature of 85°C to obtain a silicon-modified epoxy resin; wherein the first initiator and the second initiator are both benzoyl peroxide, and the mass ratio of the epoxy resin, n-butanol, propylene glycol methyl ether, the first initiator, the second initiator, and vinyl trimethoxy silane is 46.5:35:35:0.75:1.35:1.65;

[0067] The silicon-modified epoxy resin, the mercapto titanium dioxide / hexagonal boron nitride composite material, and the o-bisallyl bisphenol A epoxy resin were mixed at 40°C for 35 minutes, and dimethylacetamide, chalcone block polyether sulfone, fluorine-modified polyether amine, and a photoinitiator were added under light-proof conditions and continued to mix evenly. The mass ratio of the silicon-modified epoxy resin, the mercapto titanium dioxide / hexagonal boron nitride composite material, the o-bisallyl bisphenol A epoxy resin, dimethylacetamide, chalcone block polyether sulfone, fluorine-modified polyether amine, and the photoinitiator was 80:4.5:25:13:18:28:3.5. The preparation of the mercapto titanium dioxide / hexagonal boron nitride composite material was the same as in Example 1 to obtain an insulating weather-resistant coating.

[0068] Example 4

[0069] This embodiment discloses a method for preparing an insulating weather-resistant coating, comprising the following steps:

[0070] Step 1, preparing chalcone-block polyethersulfone and fluorine-modified polyetheramine;

[0071] Wherein, the chalcone block polyether sulfone is prepared by the following steps:

[0072] (E)-1,3-bis(4-hydroxyphenyl)-2-propene-1-one, 2,2-bis(4-hydroxyphenyl)propane, 4,4'-difluorodiphenyl sulfone, dimethylacetamide, toluene and potassium carbonate were mixed and stirred at a mass ratio of 2.65:6.95:10.1:115:45:11.3 at room temperature for 25 minutes, reacted at 140°C for 4.5 hours in a nitrogen atmosphere, and continued to react at 150°C for 7.5 hours after the reaction. After the reaction, the mixture was cooled to room temperature to obtain a reaction product, and a 1wt% acetic acid aqueous solution with a mass of 10 times that of the reaction product was added for precipitation, filtered, and a filter cake was taken, and water and methanol with a mass of 6 times that of the filter cake were added in sequence for washing, and dried at 55°C for 26 hours to obtain a chalcone block polyether sulfone;

[0073] Wherein, the fluorine-modified polyetheramine is prepared by the following steps:

[0074] Perfluoropolyether alcohol, p-toluenesulfonyl chloride, dichloromethane and triethylamine were mixed in a mass ratio of 5:1.38:14:0.73, stirred at room temperature for 1.8 hours, reacted at 60°C for 1.5 hours, and purified after the reaction to obtain a reaction product; the reaction product was mixed with polyetheramine in a mass ratio of 4.5:2.7, and continued to react at 105°C for 13 hours. After the reaction was completed, it was purified again to obtain a fluorine-modified polyetheramine;

[0075] The purification operation includes: when preparing the reaction product, in the crude reaction product obtained after the reaction is completed, ethanol and trichlorotrifluoroethane are added in order to wash the crude reaction product in an amount of 5 times the mass of the crude reaction product, then 1 mol / L aqueous hydrogen chloride solution is added to neutralize to neutrality, and finally water is added in an amount of 5 times the mass of the crude reaction product, liquid separation is performed, an organic phase is taken, and the solvent is removed by rotary evaporation at a temperature of 35°C; the re-purification operation includes: when preparing the fluorine-modified polyetheramine, in the crude reaction product obtained after the reaction is completed, ethanol, trichlorotrifluoroethane and water are added in order to wash the crude reaction product in an amount of 5 times the mass of the crude reaction product, and then dichloromethane is added in an amount of 5 times the mass of the crude reaction product, liquid separation is performed, an organic phase is taken, and the solvent is removed by rotary evaporation at a temperature of 35°C;

[0076] Step 2, the epoxy resin, n-butanol, propylene glycol methyl ether, and the first initiator are mixed and dissolved in a nitrogen atmosphere at a temperature of 55°C, the second initiator and vinyl trimethoxy silane are added, and the reaction is carried out at a temperature of 120°C for 4.5 hours. After the reaction is completed, it is cooled to room temperature, and the solvent is removed by rotary evaporation at a temperature of 85°C to obtain a silicon-modified epoxy resin; wherein the first initiator and the second initiator are both benzoyl peroxide, and the mass ratio of the epoxy resin, n-butanol, propylene glycol methyl ether, the first initiator, the second initiator, and vinyl trimethoxy silane is 47:35:35:0.78:1.38:1.7;

[0077] The silicon-modified epoxy resin, the mercapto titanium dioxide / hexagonal boron nitride composite material, and the o-bisallyl bisphenol A epoxy resin were mixed at 40°C for 35 minutes, and dimethylacetamide, chalcone block polyether sulfone, fluorine-modified polyether amine, and a photoinitiator were added under light-proof conditions and continued to mix evenly. The mass ratio of the silicon-modified epoxy resin, the mercapto titanium dioxide / hexagonal boron nitride composite material, the o-bisallyl bisphenol A epoxy resin, dimethylacetamide, chalcone block polyether sulfone, fluorine-modified polyether amine, and the photoinitiator was 80:5:28:14:19:29:3.8. The preparation of the mercapto titanium dioxide / hexagonal boron nitride composite material was the same as in Example 1 to obtain an insulating weather-resistant coating.

[0078] Example 5

[0079] This embodiment discloses a method for preparing an insulating weather-resistant coating, comprising the following steps:

[0080] Step 1, preparing chalcone-block polyethersulfone and fluorine-modified polyetheramine;

[0081] Wherein, the chalcone block polyether sulfone is prepared by the following steps:

[0082] (E)-1,3-bis(4-hydroxyphenyl)-2-propene-1-one, 2,2-bis(4-hydroxyphenyl)propane, 4,4'-difluorodiphenyl sulfone, dimethylacetamide, toluene and potassium carbonate were mixed and stirred at a mass ratio of 2.7:6.8:10.1:120:50:11.5 at room temperature for 30 minutes, reacted at 140°C for 4 hours in a nitrogen atmosphere, and continued to react at 150°C for 7 hours after the reaction. After the reaction, the mixture was cooled to room temperature to obtain a reaction product, and a 1wt% acetic acid aqueous solution with a mass of 10 times that of the reaction product was added for precipitation, filtered, and a filter cake was taken, and water and methanol with a mass of 8 times that of the filter cake were added in sequence for washing, and dried at 60°C for 24 hours to obtain a chalcone block polyether sulfone;

[0083] Wherein, the fluorine-modified polyetheramine is prepared by the following steps:

[0084] Perfluoropolyether alcohol, p-toluenesulfonyl chloride, dichloromethane and triethylamine were mixed in a mass ratio of 5:1.4:15:0.73, stirred at room temperature for 2 hours, reacted at 60°C for 1 hour, and purified after the reaction to obtain a reaction product; the reaction product was mixed with polyetheramine in a mass ratio of 4.5:2.8, and continued to react at 105°C for 12 hours. After the reaction was completed, it was purified again to obtain a fluorine-modified polyetheramine;

[0085] The purification operation includes: when preparing the reaction product, in the crude reaction product obtained after the reaction is completed, ethanol and trichlorotrifluoroethane are added in order to wash the crude reaction product in an amount of 5 times the mass of the crude reaction product, then 1 mol / L of a hydrogen chloride aqueous solution is added to neutralize it to neutrality, and finally water is added in an amount of 5 times the mass of the crude reaction product, liquid separation is performed, an organic phase is taken, and the solvent is removed by rotary evaporation at a temperature of 40°C; the re-purification operation includes: when preparing the fluorine-modified polyetheramine, in the crude reaction product obtained after the reaction is completed, ethanol, trichlorotrifluoroethane and water are added in order to wash the crude reaction product in an amount of 5 times the mass of the crude reaction product, then dichloromethane is added in an amount of 5 times the mass of the crude reaction product, liquid separation is performed, an organic phase is taken, and the solvent is removed by rotary evaporation at a temperature of 40°C;

[0086] Step 2, the epoxy resin, n-butanol, propylene glycol methyl ether, and the first initiator are mixed and dissolved in a nitrogen atmosphere at 60°C, the second initiator and vinyl trimethoxy silane are added, and the reaction is carried out at 120°C for 4 hours. After the reaction is completed, the mixture is cooled to room temperature, and the solvent is removed by rotary evaporation at 90°C to obtain a silicon-modified epoxy resin; wherein the first initiator and the second initiator are both benzoyl peroxide, and the mass ratio of the epoxy resin, n-butanol, propylene glycol methyl ether, the first initiator, the second initiator, and vinyl trimethoxy silane is 48:40:40:0.8:1.4:1.8;

[0087] The silicon-modified epoxy resin, the mercapto titanium dioxide / hexagonal boron nitride composite material, and the o-bisallyl bisphenol A epoxy resin were mixed at 45° C. for 30 min, and dimethylacetamide, chalcone block polyether sulfone, fluorine-modified polyether amine, and a photoinitiator were added under light-proof conditions and continued to mix evenly. The mass ratio of the silicon-modified epoxy resin, the mercapto titanium dioxide / hexagonal boron nitride composite material, the o-bisallyl bisphenol A epoxy resin, dimethylacetamide, chalcone block polyether sulfone, fluorine-modified polyether amine, and the photoinitiator was 80:6:30:15:20:30:4. The preparation of the mercapto titanium dioxide / hexagonal boron nitride composite material is the same as in Example 1, and an insulating weather-resistant coating is obtained.

[0088] Comparative Example 1

[0089] This comparative example discloses a method for preparing a coating, comprising the following steps:

[0090] Step 1, preparing chalcone-block polyethersulfone and fluorine-modified polyetheramine;

[0091] Wherein, the chalcone block polyether sulfone is prepared by the following steps:

[0092] (E)-1,3-bis(4-hydroxyphenyl)-2-propene-1-one, 2,2-bis(4-hydroxyphenyl)propane, 4,4'-difluorodiphenyl sulfone, dimethylacetamide, toluene and potassium carbonate were mixed and stirred at a mass ratio of 2.5:7:10:90:40:11 at room temperature for 20 minutes, reacted at 130°C for 5 hours in a nitrogen atmosphere, and continued to react at 140°C for 8 hours after the reaction. After the reaction, the mixture was cooled to room temperature to obtain a reaction product, and a 1wt% acetic acid aqueous solution with a mass of 8 times that of the reaction product was added for precipitation, filtered, and a filter cake was taken, and water and methanol with a mass of 5 times that of the filter cake were added in sequence for washing, and dried at 50°C for 28 hours to obtain a chalcone block polyether sulfone;

[0093] Wherein, the fluorine-modified polyetheramine is prepared by the following steps:

[0094] Perfluoropolyether alcohol, p-toluenesulfonyl chloride, dichloromethane and triethylamine were mixed in a mass ratio of 5:1.3:10:0.7, stirred at room temperature for 1.5 hours, reacted at 50°C for 2 hours, and purified after the reaction to obtain a reaction product; the reaction product was mixed with polyetheramine in a mass ratio of 4.5:2.5, and continued to react at 95°C for 14 hours. After the reaction, it was purified again to obtain a fluorine-modified polyetheramine;

[0095] The purification operation includes: when preparing the reaction product, in the crude reaction product obtained after the reaction is completed, ethanol and trichlorotrifluoroethane are added in sequence in an amount of 4 times the mass of the crude reaction product for washing, and then 1 mol / L aqueous hydrogen chloride solution is added to neutralize to neutrality, and finally water is added in an amount of 4 times the mass of the crude reaction product, liquid separation is performed, an organic phase is taken, and the solvent is removed by rotary evaporation at a temperature of 30°C; the re-purification operation includes: when preparing the fluorine-modified polyetheramine, in the crude reaction product obtained after the reaction is completed, ethanol, trichlorotrifluoroethane and water are added in sequence in an amount of 4 times the mass of the crude reaction product for washing, and then dichloromethane is added in an amount of 4 times the mass of the crude reaction product, liquid separation is performed, an organic phase is taken, and the solvent is removed by rotary evaporation at a temperature of 30°C;

[0096] Step 2, the epoxy resin, n-butanol, propylene glycol methyl ether, and the first initiator are mixed and dissolved in a nitrogen atmosphere at a temperature of 50°C, the second initiator and vinyl trimethoxy silane are added, and the reaction is carried out at a temperature of 110°C for 5 hours. After the reaction is completed, it is cooled to room temperature, and the solvent is removed by rotary evaporation at a temperature of 80°C to obtain a silicon-modified epoxy resin; wherein the first initiator and the second initiator are both benzoyl peroxide, and the mass ratio of the epoxy resin, n-butanol, propylene glycol methyl ether, the first initiator, the second initiator, and vinyl trimethoxy silane is 45:30:30:0.7:1.3:1.5;

[0097] The silicon-modified epoxy resin, the titanium dioxide / hexagonal boron nitride composite material, and the o-bisallyl bisphenol A epoxy resin were mixed at a temperature of 35° C. for 40 minutes, and dimethylacetamide, chalcone block polyether sulfone, fluorine-modified polyether amine, and a photoinitiator were added under light-proof conditions and continued to be mixed uniformly, and the mass ratio of the silicon-modified epoxy resin, the mercapto titanium dioxide / hexagonal boron nitride composite material, the o-bisallyl bisphenol A epoxy resin, dimethylacetamide, chalcone block polyether sulfone, fluorine-modified polyether amine, and the photoinitiator was 80:3:20:10:15:25:3 to obtain a coating;

[0098] The titanium dioxide / hexagonal boron nitride composite material is prepared by the following steps:

[0099] Hexagonal boron nitride was mixed with ethanol, ultrasonically dispersed for 14 hours, and a precursor solution was added dropwise. The precursor solution was prepared by mixing and dissolving ethanol, acetic acid, and tetrabutyl titanate in a mass ratio of 33:2.5:11. The mass ratio of hexagonal boron nitride, ethanol, and precursor solution was 5:140:8.3. The dropping time was 20 minutes. After the dropping was completed, the reaction was stirred at room temperature for 5.5 hours. After the reaction was completed, it was dried at 75°C for 14 hours, placed in a muffle furnace and calcined at 480°C for 3 hours, and cooled to room temperature after calcination to obtain a titanium dioxide / hexagonal boron nitride composite material.

[0100] Comparative Example 2

[0101] This comparative example discloses a method for preparing a coating, comprising the following steps:

[0102] Step 1, (E)-1,3-bis(4-hydroxyphenyl)-2-propene-1-one, 2,2-bis(4-hydroxyphenyl)propane, 4,4'-difluorodiphenyl sulfone, dimethylacetamide, toluene and potassium carbonate were mixed and stirred at a mass ratio of 2.5:7:10:90:40:11 at room temperature for 20 minutes, reacted at 130°C for 5 hours in a nitrogen atmosphere, and continued to react at 140°C for 8 hours after the reaction. After the reaction, the reaction was cooled to room temperature to obtain a reaction product, and a 1wt% acetic acid aqueous solution with a mass of 8 times that of the reaction product was added for precipitation, filtered, and the filter cake was taken, and water and methanol with a mass of 5 times that of the filter cake were added in turn for washing, and dried at 50°C for 28 hours to obtain a chalcone block polyether sulfone;

[0103] Step 2, the epoxy resin, n-butanol, propylene glycol methyl ether, and the first initiator are mixed and dissolved in a nitrogen atmosphere at a temperature of 50°C, the second initiator and vinyl trimethoxy silane are added, and the reaction is carried out at a temperature of 110°C for 5 hours. After the reaction is completed, it is cooled to room temperature, and the solvent is removed by rotary evaporation at a temperature of 80°C to obtain a silicon-modified epoxy resin; wherein the first initiator and the second initiator are both benzoyl peroxide, and the mass ratio of the epoxy resin, n-butanol, propylene glycol methyl ether, the first initiator, the second initiator, and vinyl trimethoxy silane is 45:30:30:0.7:1.3:1.5;

[0104] The silicon-modified epoxy resin and o-bisallyl bisphenol A epoxy resin were mixed at 35°C for 40 minutes, and dimethylacetamide, chalcone block polyether sulfone, fluorine-modified polyether amine and photoinitiator were added under light-proof conditions and continued to mix evenly. The mass ratio of the silicon-modified epoxy resin, o-bisallyl bisphenol A epoxy resin, dimethylacetamide, chalcone block polyether sulfone, fluorine-modified polyether amine and photoinitiator was 80:20:10:15:25:3 to obtain a coating.

[0105] Comparative Example 3

[0106] This comparative example discloses a method for preparing a coating, comprising the following steps:

[0107] Step 1, perfluoropolyether alcohol, p-toluenesulfonyl chloride, dichloromethane, and triethylamine are mixed in a mass ratio of 5:1.3:10:0.7, stirred at room temperature for 1.5 hours, reacted at 50°C for 2 hours, and purified after the reaction to obtain a reaction product; the reaction product is mixed with polyetheramine in a mass ratio of 4.5:2.5, and the reaction is continued at 95°C for 14 hours. After the reaction is completed, it is purified again to obtain a fluorine-modified polyetheramine;

[0108] The purification operation includes: when preparing the reaction product, in the crude reaction product obtained after the reaction is completed, ethanol and trichlorotrifluoroethane are added in sequence in an amount of 4 times the mass of the crude reaction product for washing, and then 1 mol / L aqueous hydrogen chloride solution is added to neutralize to neutrality, and finally water is added in an amount of 4 times the mass of the crude reaction product, liquid separation is performed, an organic phase is taken, and the solvent is removed by rotary evaporation at a temperature of 30°C; the re-purification operation includes: when preparing the fluorine-modified polyetheramine, in the crude reaction product obtained after the reaction is completed, ethanol, trichlorotrifluoroethane and water are added in sequence in an amount of 4 times the mass of the crude reaction product for washing, and then dichloromethane is added in an amount of 4 times the mass of the crude reaction product, liquid separation is performed, an organic phase is taken, and the solvent is removed by rotary evaporation at a temperature of 30°C;

[0109] Step 2, the epoxy resin, n-butanol, propylene glycol methyl ether, and the first initiator are mixed and dissolved in a nitrogen atmosphere at a temperature of 50°C, the second initiator and vinyl trimethoxy silane are added, and the reaction is carried out at a temperature of 110°C for 5 hours. After the reaction is completed, it is cooled to room temperature, and the solvent is removed by rotary evaporation at a temperature of 80°C to obtain a silicon-modified epoxy resin; wherein the first initiator and the second initiator are both benzoyl peroxide, and the mass ratio of the epoxy resin, n-butanol, propylene glycol methyl ether, the first initiator, the second initiator, and vinyl trimethoxy silane is 45:30:30:0.7:1.3:1.5;

[0110] The silicon-modified epoxy resin, the mercapto titanium dioxide / hexagonal boron nitride composite material, and the epoxy resin E44 were mixed at 35°C for 40 minutes, and dimethylacetamide, fluorine-modified polyetheramine, and a photoinitiator were added under light-proof conditions and continued to mix evenly. The mass ratio of the silicon-modified epoxy resin, the mercapto titanium dioxide / hexagonal boron nitride composite material, the epoxy resin E44, dimethylacetamide, the fluorine-modified polyetheramine, and the photoinitiator was 80:3:35:10:25:3. The preparation of the mercapto titanium dioxide / hexagonal boron nitride composite material was the same as in Example 1 to obtain a coating.

[0111] In the above examples and comparative examples: (E)-1,3-bis(4-hydroxyphenyl)-2-propene-1-one is from Shaoyuan Technology Co., Ltd., CAS No.: 108997-30-4; 2,2-bis(4-hydroxyphenyl)propane is from AlfaAesar, CAS No.: 80-05-7; 4,4'-difluorodiphenyl sulfone is from Shandong West Asia Chemical Co., Ltd., CAS No.: 383-29-9; perfluoropolyether alcohol is from Shanghai MacLean Biochemical Technology Co., Ltd., product name D-type perfluoropolyether alcohol, Mn=1000; p-toluenesulfonyl chloride is from Shanghai MacLean Biochemical Technology Co., Ltd., CAS No.: 98-59-9; polyetheramine is from Shanghai Alfa Latin Biochemical Technology Co., Ltd., product name polyetheramine D-230; epoxy resin comes from Shandong Maofa Chemical Co., Ltd., product name epoxy resin E44; o-bisallyl bisphenol A epoxy resin comes from Qingdao Baichen New Materials Technology Co., Ltd., product name o-bisallyl bisphenol A epoxy resin (DADGEBA), epoxy value 0.38; photoinitiator comes from Nanjing Milan New Materials Co., Ltd., product name photoinitiator 1173, CAS number: 7374-98-5; hexagonal boron nitride comes from Shanghai Aladdin Biochemical Technology Co., Ltd., specification 0.5μm; γ-mercaptopropyltrimethoxysilane comes from Shanghai Aladdin Biochemical Technology Co., Ltd., CAS number: 4420-74-0.

[0112] Test example

[0113] The coatings prepared in the above embodiments and comparative examples were tested for performance, and the specific test results are shown in Table 1:

[0114] Table 1

[0115]

[0116] The tests of various indicators in Table 1 are based on the following standards: adhesion is measured with reference to GB / T1720-1989 "Determination of adhesion of paint films"; impact strength is measured with reference to GB / T1732-2020 "Determination of impact resistance of paint films"; volume resistivity is measured by GB / T1410 "Test method for volume resistivity and surface resistivity of solid insulating materials"; water resistance is measured with reference to GB / T1733-1993 "Determination of water resistance of paint films"; weather resistance tests include acid and alkali resistance and artificial aging resistance, which are measured with reference to GB / T1763-79 "Determination of chemical resistance of paint films" and GB / T1766-2008 "Rating method for aging of paint and varnish coatings" respectively.

[0117] It can be seen from the test results in Table 1 that the coating prepared by the present invention has excellent insulation and weather resistance, and is good in water resistance and mechanical properties.

[0118] The present invention uses a silicon-modified epoxy resin with excellent hydrophobicity as a base resin, and adds an ortho-bisallyl bisphenol A epoxy resin having a carbon-carbon double bond in the side chain, a mercapto titanium dioxide / hexagonal boron nitride composite material, a chalcone block polyether sulfone, a fluorine-modified polyether amine, a solvent and a photoinitiator therein to obtain a coating, wherein the chalcone block polyether sulfone contains a chalcone structure, which can construct a light-heat dual curing system, improve the crosslinking degree, and improve the corrosion resistance and weather resistance of the coating base; the fluorine-modified polyether amine contains fluorine atoms, which improves the hydrophobicity of the base and the insulation performance thereof, and the terminal amino group of the fluorine-modified polyether amine and the terminal hydroxyl group in the chalcone block polyether sulfone can react with the epoxy group of the epoxy resin, and can be used as a curing agent to promote the curing of the epoxy resin base during thermal curing, thereby improving the crosslinking degree;

[0119] Ortho-bisallyl bisphenol A epoxy resin contains carbon-carbon double bonds and can be photocured under photoinitiator conditions; in the mercapto titanium dioxide / hexagonal boron nitride composite material, hexagonal boron nitride has excellent insulating properties, and titanium dioxide has good UV resistance. The two are composited and surface modified and introduced into the coating. The mercapto titanium dioxide / hexagonal boron nitride composite material can be evenly dispersed in the coating matrix, building a maze for the corrosive medium in the coating matrix to limit the invasion of the corrosive medium. The mercapto functional groups on its surface can participate in the dual curing process of the coating, react with both carbon-carbon double bonds and epoxy groups, further improving the crosslinking degree of the coating matrix and improving the mechanical properties and corrosion resistance and weather resistance of the coating.

[0120] In Comparative Example 1, the titanium dioxide / hexagonal boron nitride composite material has no surface modification, and the compatibility of the titanium dioxide / hexagonal boron nitride composite material in the matrix resin of the coating is reduced, which affects the mechanical properties and water and weather resistance of the coating. Therefore, the impact strength and water and weather resistance of Comparative Example 1 are not as good as those of the embodiment;

[0121] In Comparative Example 2, no fluorine-modified polyetheramine and mercapto titanium dioxide / hexagonal boron nitride composite material are added, and the reinforcing effect of fluorine atoms and titanium dioxide / hexagonal boron nitride composite material on the insulating properties of the matrix is ​​lacking. At the same time, since the terminal amino group of the fluorine-modified polyetheramine can react with the epoxy group of the epoxy resin, the mercapto functional group on the surface of the mercapto titanium dioxide / hexagonal boron nitride composite material can react with the carbon-carbon double bond and the epoxy group, thereby improving the crosslinking degree of the epoxy resin. Therefore, the impact strength, insulation, and water and weather resistance of Comparative Example 2 are not as good as those of the embodiment;

[0122] In Comparative Example 3, chalcone block polyether sulfone was not added, and the o-bisallyl bisphenol A epoxy resin was replaced with epoxy resin E44. Since the chalcone block polyether sulfone contains a chalcone structure, and its terminal hydroxyl group can react with the epoxy group of the epoxy resin, and the o-bisallyl bisphenol A epoxy resin contains a carbon-carbon double bond, the two can be added to the epoxy resin matrix to construct a light-heat dual curing system, increase the crosslinking degree, and improve the mechanical properties and corrosion resistance and weather resistance of the coating matrix. Therefore, the impact strength and water resistance and weather resistance of Comparative Example 3 are not as good as those of the embodiment.

[0123] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing an insulating weather-resistant coating, characterized in that: The following steps are involved: Step 1, preparing chalcone-block polyethersulfone and fluorine-modified polyetheramine; Wherein, the chalcone block polyether sulfone is prepared by the following steps: (E)-1,3-bis(4-hydroxyphenyl)-2-propene-1-one, 2,2-bis(4-hydroxyphenyl)propane, 4,4'-difluorodiphenyl sulfone, dimethylacetamide, toluene and potassium carbonate are mixed and stirred to react, and after the reaction is completed, the reaction is continued, and after the reaction is completed, the mixture is cooled, purified and dried to obtain a chalcone block polyether sulfone; Wherein, the fluorine-modified polyetheramine is prepared by the following steps: The perfluoropolyether alcohol, p-toluenesulfonyl chloride, dichloromethane and triethylamine are mixed and stirred to react, and after the reaction is completed, the reaction is purified to obtain a reaction product; the reaction product is mixed with a polyetheramine, and the reaction is continued, and after the reaction is completed, the reaction is purified again to obtain a fluorine-modified polyetheramine; Step 2: Mix the silicon-modified epoxy resin, the mercapto titanium dioxide / hexagonal boron nitride composite material, and the o-bisallyl bisphenol A epoxy resin, add dimethylacetamide, chalcone block polyether sulfone, fluorine-modified polyether amine, and a photoinitiator, and continue to mix evenly to obtain an insulating weather-resistant coating.

2. The method for preparing an insulating weather-resistant coating according to claim 1, characterized in that: In the step 1 for preparing chalcone block polyether sulfone, the mass ratio of (E)-1,3-bis(4-hydroxyphenyl)-2-propene-1-one, 2,2-bis(4-hydroxyphenyl)propane, 4,4'-difluorodiphenyl sulfone, dimethylacetamide, toluene and potassium carbonate is 2.5-2.7:6.8-7:10-10.1:90-120:40-50:11-11.5; the reaction conditions are: reacting in a nitrogen atmosphere at a temperature of 130-140° C. for 4-5 hours; and the continued reaction conditions are: continuing the reaction in a nitrogen atmosphere at a temperature of 140-150° C. for 7-8 hours.

3. The method for preparing an insulating weather-resistant coating according to claim 1, characterized in that: In the step 1 for preparing fluorine-modified polyetheramine, the mass ratio of perfluoropolyether alcohol, p-toluenesulfonyl chloride, dichloromethane and triethylamine is 5:1.3-1.4:10-15:0.7-0.73; the reaction conditions are: reacting at a temperature of 50-60°C for 1-2h; the mass ratio of the reaction product to the polyetheramine is 4.5:2.5-2.8; and the continued reaction conditions are: continuing the reaction at a temperature of 95-105°C for 12-14h.

4. The method for preparing an insulating weather-resistant coating according to claim 1, characterized in that: The silicon-modified epoxy resin in step 2 is prepared by the following steps: The epoxy resin, n-butanol, propylene glycol methyl ether and the first initiator are mixed and dissolved, and the second initiator and vinyl trimethoxysilane are added to react. After the reaction is completed, the mixture is cooled and the solvent is removed by rotary evaporation to obtain a silicon-modified epoxy resin.

5. The method for preparing an insulating weather-resistant coating according to claim 4, characterized in that: In the preparation of the silicon-modified epoxy resin: the mass ratio of epoxy resin, n-butanol, propylene glycol methyl ether, the first initiator, the second initiator, and vinyl trimethoxysilane is 45-48:30-40:30-40:0.7-0.8:1.3-1.4:1.5-1.8, and the first initiator and the second initiator are both benzoyl peroxide; the reaction conditions are: reacting in a nitrogen atmosphere at a temperature of 110-120° C. for 4-5 hours.

6. The method for preparing an insulating weather-resistant coating according to claim 1, characterized in that: The mercapto titanium dioxide / hexagonal boron nitride composite material in step 2 is prepared by the following steps: Step (1), mixing hexagonal boron nitride with ethanol, ultrasonically dispersing, dripping a precursor solution, reacting after the dripping is complete, drying, calcining, and cooling after the reaction is complete to obtain a titanium dioxide / hexagonal boron nitride composite material; Step (2), mixing the titanium dioxide / hexagonal boron nitride composite material with toluene, ultrasonically dispersing, adding γ-mercaptopropyltrimethoxysilane, reacting, and after the reaction is completed, filtering, washing, and drying to obtain the mercapto titanium dioxide / hexagonal boron nitride composite material.

7. The method for preparing an insulating weather-resistant coating according to claim 6, characterized in that: In the step (1), the mass ratio of hexagonal boron nitride, ethanol and precursor solution is 5:130-150:8-8.5, the precursor solution is prepared by mixing and dissolving ethanol, acetic acid and tetrabutyl titanate in a mass ratio of 30-35:2-3:10-12, and the dropping time is 15-20 minutes. When preparing the titanium dioxide / hexagonal boron nitride composite material, the reaction conditions are: stirring the reaction at room temperature for 5-6 hours; the calcination conditions are: placing in a muffle furnace and calcining at a temperature of 450-500° C. for 2.5-3 hours.

8. The method for preparing an insulating weather-resistant coating according to claim 6, characterized in that: In the step (2), the mass ratio of the titanium dioxide / hexagonal boron nitride composite material, toluene and γ-mercaptopropyltrimethoxysilane is 10:180-220:70-75. When preparing the mercapto titanium dioxide / hexagonal boron nitride composite material, the reaction conditions are: reacting at a temperature of 50-60° C. for 4-6 hours.

9. The method for preparing an insulating weather-resistant coating according to claim 1, characterized in that: In the step 2, the mass ratio of silicon-modified epoxy resin, mercapto titanium dioxide / hexagonal boron nitride composite material, o-bisallyl bisphenol A epoxy resin, dimethylacetamide, chalcone block polyether sulfone, fluorine-modified polyether amine, and photoinitiator is 80:3-6:20-30:10-15:15-20:25-30:3-4.

10. An insulating weather-resistant coating prepared by the method for preparing an insulating weather-resistant coating according to any one of claims 1 to 9.

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