High-insulation anti-corrosion protective coating and preparation method thereof

Abstract

The invention discloses a high-insulation anticorrosive protective coating which is prepared from the following raw materials in parts by weight: 60-80 parts of epoxy resin, 5-8 parts of an amine curing agent, 0.8-1.2 parts of dimethylimidazole and 25-40 parts of filler, and the filler comprises at least one of modified aluminum hydroxide, boron nitride nanosheets and modified boron nitride nanotubes. The coating provided by the invention has excellent fireproof performance, corrosion resistance, hydrophobic performance and insulating performance, and can well protect lines from interference when being coated on the surfaces of tower trunks and electric power lines.

Description

Technical Field

[0001] The present invention relates to the field of coatings, and particularly to a high-insulation anti-corrosion protective coating and a preparation method thereof. Background Art

[0002] With the acceleration of the urbanization process, as an important part of the urban power supply system, power lines undertake the important task of transmitting electric energy. With the continuous increase of energy infrastructure construction, the safe operation and maintenance of line facilities have received increasing attention. As an effective protective measure, the market demand for bird damage prevention and control of power lines has gradually increased. However, during the operation of current power lines, they are often interfered by animals such as birds, resulting in faults such as short circuits and groundings. Therefore, formulating effective prevention and control measures for the bird damage problem of power lines is of great significance for ensuring the safe and stable operation of the power system.

[0003] Therefore, there is an urgent need to study a high-insulation protective coating with excellent performance, which can be sprayed or brushed on the surface of tower trunks and power lines to prevent interference from animals such as birds and weather. Summary of the Invention

[0004] To solve the above problems, a first aspect of the present invention provides a high-insulation anti-corrosion protective coating. Calculated by weight, the raw materials for preparation include: 60 - 80 parts of epoxy resin, 5 - 8 parts of amine curing agent, 0.8 - 1.2 parts of dimethylimidazole, and 25 - 40 parts of filler.

[0005] The epoxy resin includes epoxy resin E-12 with an epoxy equivalent of 780 - 850 g / eq and hydrogenated bisphenol A epoxy resin with an epoxy equivalent of 200 - 300 g / eq. The weight ratio of epoxy resin E-12 to hydrogenated bisphenol A epoxy resin is 1:1 - 1.5.

[0006] The epoxy resin E-12 is purchased from Hangzhou Yihuisheng Chemical Co., Ltd.

[0007] The hydrogenated bisphenol A epoxy resin has an epoxy equivalent of 215 g / eq and is purchased from Complex High-Tech (Shanghai), and its product name is EP-4080E.

[0008] The amine curing agent includes isophorone diamine and modified diethylenetriamine; preferably, the amine curing agent includes isophorone diamine and acrylate-modified diethylenetriamine; the weight ratio of isophorone diamine to acrylate-modified diethylenetriamine is 1:1 - 3.

[0009] In the acrylate-modified diethylenetriamine, the acrylate includes at least one of 2-butyl octyl methacrylate, n-undecyl methacrylate, and isooctyl acrylate; preferably, the acrylate is 2-butyl octyl methacrylate.

[0010] The reaction of isophorone diamine and epoxy resin can obtain a polymer with a high crosslinking density, but it has strong rigidity and brittleness. By selecting acrylate to modify diethylenetriamine, especially when the acrylate is at least one of 2-butyl octyl methacrylate, n-undecyl methacrylate, and isooctyl acrylate, the impact deformation of the paint film can be reduced. Moreover, when the acrylate is 2-butyl octyl methacrylate, when the coating softens due to heat (i.e., during a fire), the carbon layer of the coating shows better denseness and continuity, thereby improving the fire resistance of the coating.

[0011] The preparation method of the acrylate-modified diethylenetriamine includes the following steps: mixing acrylate and diethylenetriamine according to a certain molar ratio (the molar ratio is 1:1), then reacting at 60°C for 2 hours and then heating to 90°C and continuing to react for 2 hours to obtain it.

[0012] The filler includes at least one of modified aluminum hydroxide, boron nitride nanosheets, and modified boron nitride nanotubes. Optionally, the filler includes modified aluminum hydroxide and modified boron nitride nanotubes, and the weight ratio of the modified aluminum hydroxide to the modified boron nitride nanotubes is 5-7:1. Optionally, the weight ratio of the modified aluminum hydroxide to the modified boron nitride nanotubes is 6:1.

[0013] Preferably, the modified aluminum hydroxide is epoxy group-modified aluminum hydroxide, with the model ATH-5A and the manufacturer being Guangdong Haike New Materials Co., Ltd.

[0014] In this application, the aluminum hydroxide in the modified aluminum hydroxide is active aluminum hydroxide, which can decompose and release water molecules when encountering high temperature, washing away the carbon particles formed on the polymer surface. At the same time, the good thermal conductivity of aluminum hydroxide can reduce heat concentration and effectively reduce the decomposition of the epoxy resin coating.

[0015] The preparation method of the modified boron nitride nanotubes includes the following steps: adding 50 mg of boron nitride nanotubes and 0.3 g of cetyltrimethylammonium bromide to 200 mL of sodium hydroxide aqueous solution (concentration 0.1 mg / mL), ultrasonically dispersing evenly and then stirring at 80°C for 1 hour, then adding 2 mL of tetraethyl orthosilicate ethanol solution (concentration 0.2 mg / mL) and stirring at 80°C for 10 hours and then filtering. Adding the filtered product to a solution containing dopamine hydrochloride and stirring at 50-60°C for 24-48 hours, filtering and drying to obtain the modified boron nitride nanotubes.

[0016] The solution containing dopamine hydrochloride is obtained by dissolving dopamine hydrochloride in an alkaline aqueous solution, which can be an ammonia aqueous solution, a sodium hydroxide solution, or a tris(hydroxymethyl)aminomethane buffer (Tris-buffer) solution; optionally, the solution containing dopamine hydrochloride is obtained by dissolving 1 g of dopamine hydrochloride in 350 mL of an alkaline aqueous solution with a pH of 8.5, and the alkaline aqueous solution with a pH of 8.5 is prepared by adding 1 g of tris(hydroxymethyl)aminomethane to 600 mL of deionized water and then adjusting with 0.1 mol / L hydrochloric acid.

[0017] Among them, the width (diameter) of the boron nitride nanotubes is 50 - 70 nm, and the length is 10 - 30 microns. Preferably, the width (diameter) of the boron nitride nanotubes is 60 nm, and the length is 20 microns. The manufacturer is Dalian Yibang Technology.

[0018] The purchased boron nitride nanotubes form three-dimensional boron nitride nanotubes with irregular hexagonal boron nitride crystals on the outer surface. This irregular surface optimizes the cross-linking between the boron nitride nanotubes and the substrate, thus generating a strong interfacial interaction. Adding a lower content of boron nitride nanotubes can improve the breakdown field strength of the coating, and the silica on the surface of the boron nitride nanotubes can hinder the migration of electrons; however, with the increase of the content, new defects are formed inside the epoxy resin, affecting the uniformity inside the resin. In this application, by using three-dimensional boron nitride nanotubes with irregular hexagonal boron nitride crystals and simultaneously modifying with dopamine-like substances at the end, strong bonding can be formed with the epoxy resin matrix, optimizing the interfacial structure. At the same time, the molecular chain structure inside the epoxy resin is optimized, increasing the cross-linking density of the resin matrix, thereby further improving the corrosion resistance of the coating.

[0019] Furthermore, the coating further includes 0.5 - 1.5 parts of a leveling agent and 0.5 - 1.5 parts of a degassing agent.

[0020] The leveling agent can be a commonly used one in the art, such as an acrylate leveling agent; the degassing agent is benzoin.

[0021] The second aspect of the present invention provides a preparation method of the coating, including the following steps: adding epoxy resin, amine curing agent, 2-methylimidazole, leveling agent, benzoin, and filler into a stirring kettle in sequence and stirring evenly; then performing high-temperature melt extrusion, cooling and pulverizing to obtain a high-insulation anti-corrosion protective coating.

[0022] Beneficial effects: The coating of the present application has excellent fireproof performance, corrosion resistance, hydrophobic performance, and insulation performance. When coated on the surface of tower poles and power lines, it can well protect the lines from interference.

[0023] The acrylate-modified diethylenetriamine, epoxy group-modified aluminum hydroxide, and modified boron nitride nanotubes used in this application can not only crosslink with epoxy resin by themselves, but also interact with each other to improve their dispersion states in epoxy resin, making the formed coating structure more compact. Description of the Drawings

[0024] Figure 1 It is a wear resistance test diagram of the coating in Example 1. Detailed Description of the Invention

[0025] The present invention will be specifically described below through examples.

[0026] Unless otherwise specified, the raw materials used are commercially available.

[0027] Examples

[0028] Example 1

[0029] A high-insulation anti-corrosion protective coating, calculated by weight, the preparation raw materials include: 70 parts of epoxy resin, 8 parts of amine curing agent, 1 part of 2-methylimidazole, 35 parts of filler, 1 part of leveling agent, and 0.5 part of degassing agent.

[0030] The epoxy resin includes epoxy resin E-12 with an epoxy equivalent of 780-850 g / eq and hydrogenated bisphenol A epoxy resin with an epoxy equivalent of 200-300 g / eq, and the weight ratio of epoxy resin E-12 to hydrogenated bisphenol A epoxy resin is 1:1.

[0031] The epoxy resin E-12 is purchased from Hangzhou Yihuisheng Chemical Co., Ltd.

[0032] The epoxy equivalent of the hydrogenated bisphenol A epoxy resin is 215 g / eq, and it is purchased from Complex High-Tech (Shanghai) with the product name EP-4080E.

[0033] The amine curing agent includes isophorone diamine and acrylate-modified diethylenetriamine; the weight ratio of isophorone diamine to acrylate-modified diethylenetriamine is 3:5.

[0034] In the acrylate-modified diethylenetriamine, the acrylate is 2-butyl octyl methacrylate.

[0035] The preparation method of the acrylate-modified diethylenetriamine includes the following steps: mixing 2-butyl octyl methacrylate and diethylenetriamine according to a certain molar ratio (the molar ratio is 1:1), then reacting at 60 °C for 2 hours and then heating up to 90 °C to continue reacting for 2 hours to obtain it.

[0036] The filler includes modified aluminum hydroxide and modified boron nitride nanotubes, and the weight ratio of the modified aluminum hydroxide to the modified boron nitride nanotubes is 6:1.

[0037] The modified aluminum hydroxide is epoxy group modified aluminum hydroxide, with the model ATH-5A and the manufacturer being Guangdong Haike New Materials Co., Ltd.

[0038] The preparation method of the modified boron nitride nanotubes includes the following steps: Add 50 mg of boron nitride nanotubes and 0.3 g of cetyltrimethylammonium bromide into 200 mL of sodium hydroxide aqueous solution (concentration 0.1 mg / mL), ultrasonically disperse evenly, stir at 80 °C for 1 hour, then add 2 mL of tetraethyl orthosilicate ethanol solution (concentration 0.2 mg / mL), stir at 80 °C for 10 hours and then filter. Add the filtered product into the solution containing dopamine hydrochloride and stir at 50 - 60 °C for 36 hours, filter and dry to obtain the modified boron nitride nanotubes.

[0039] The solution containing dopamine hydrochloride is obtained by dissolving 1 g of dopamine hydrochloride in 350 mL of alkaline aqueous solution with pH 8.5. The alkaline aqueous solution with pH 8.5 is prepared by adding 1 g of tris(hydroxymethyl)aminomethane into 600 mL of deionized water and then adjusting with 0.1 mol / L hydrochloric acid.

[0040] Among them, the width (diameter) of the boron nitride nanotubes is 60 nm, the length is 20 microns, and the purchasing manufacturer is Dalian Yibang Technology.

[0041] The leveling agent is BASF leveling agent FL 3600; the degassing agent is benzoin.

[0042] The preparation method of the coating includes the following steps: Add epoxy resin, amine curing agent, dimethylimidazole, leveling agent, benzoin, and filler into a stirring kettle in sequence and stir evenly for 3 h; then carry out high-temperature melt extrusion, cool and pulverize to obtain a high-insulation anti-corrosion protective coating.

[0043] Example 2

[0044] A high-insulation anti-corrosion protective coating, calculated by weight, the preparation raw materials include: 70 parts of epoxy resin, 8 parts of amine curing agent, 1 part of dimethylimidazole, 35 parts of filler, 1 part of leveling agent, and 0.5 part of degassing agent.

[0045] The epoxy resin includes epoxy resin E-12 with an epoxy equivalent of 780 - 850 g / eq and hydrogenated bisphenol A epoxy resin with an epoxy equivalent of 200 - 300 g / eq, and the weight ratio of epoxy resin E-12 to hydrogenated bisphenol A epoxy resin is 1:1.

[0046] The manufacturer from which the epoxy resin E-12 was purchased is Hangzhou Yihuicheng Chemical Co., Ltd.

[0047] The epoxy equivalent of the hydrogenated bisphenol A epoxy resin is 215 g / eq. The manufacturer from which it was purchased is Complex High-Tech (Shanghai), and its product name is EP-4080E.

[0048] The amine curing agent includes isophorone diamine and diethylenetriamine; the weight ratio of isophorone diamine to diethylenetriamine is 3:5.

[0049] The filler includes modified aluminum hydroxide and modified boron nitride nanotubes, and the weight ratio of modified aluminum hydroxide to modified boron nitride nanotubes is 6:1.

[0050] The modified aluminum hydroxide is epoxy group-modified aluminum hydroxide, with the model ATH-5A, and the manufacturer is Guangdong Haike New Materials Co., Ltd.

[0051] The preparation method of the modified boron nitride nanotubes includes the following steps: Add 50 mg of boron nitride nanotubes and 0.3 g of cetyltrimethylammonium bromide to 200 mL of sodium hydroxide aqueous solution (concentration 0.1 mg / mL), ultrasonically disperse evenly, stir at 80 °C for 1 hour, then add 2 mL of tetraethyl orthosilicate ethanol solution (concentration 0.2 mg / mL), stir at 80 °C for 10 hours and then filter. Add the filtered product to a solution containing dopamine hydrochloride and stir at 50 - 60 °C for 36 hours, filter and dry to obtain the modified boron nitride nanotubes.

[0052] The solution containing dopamine hydrochloride is obtained by dissolving 1 g of dopamine hydrochloride in 350 mL of alkaline aqueous solution with a pH of 8.5. The alkaline aqueous solution with a pH of 8.5 is prepared by adding 1 g of tris(hydroxymethyl)aminomethane to 600 mL of deionized water, and then adjusting with 0.1 mol / L hydrochloric acid.

[0053] Among them, the width (diameter) of the boron nitride nanotubes is 60 nm, the length is 20 microns, and the manufacturer from which it was purchased is Dalian Yibang Technology.

[0054] The leveling agent is BASF leveling agent FL 3600; the degassing agent is benzoin.

[0055] The preparation method of the coating is the same as that of Example 1 specifically.

[0056] Example 3

[0057] A high-insulation anti-corrosion protective coating, calculated by weight, the raw materials for preparation include: 70 parts of epoxy resin, 8 parts of amine curing agent, 1 part of dimethylimidazole, 35 parts of filler, 1 part of leveling agent, and 0.5 part of degassing agent.

[0058] The epoxy resin includes epoxy resin E-12 with an epoxy equivalent of 780-850 g / eq and hydrogenated bisphenol A epoxy resin with an epoxy equivalent of 200-300 g / eq, and the weight ratio of epoxy resin E-12 to hydrogenated bisphenol A epoxy resin is 1:1.

[0059] The manufacturer of the epoxy resin E-12 is Hangzhou Yihuisheng Chemical Co., Ltd.

[0060] The epoxy equivalent of the hydrogenated bisphenol A epoxy resin is 215 g / eq, the manufacturer is Complex High-Tech (Shanghai), and the product name is EP-4080E.

[0061] The amine curing agent includes isophorone diamine and acrylate-modified diethylenetriamine; the weight ratio of isophorone diamine to acrylate-modified diethylenetriamine is 3:5.

[0062] In the acrylate-modified diethylenetriamine, the acrylate is n-undecyl methacrylate.

[0063] The preparation method of the acrylate-modified diethylenetriamine includes the following steps: mixing n-undecyl methacrylate and diethylenetriamine in a certain molar ratio (molar ratio is 1:1), then reacting at 60 °C for 2 hours and then heating up to 90 °C and continuing to react for 2 hours to obtain it.

[0064] The filler includes modified aluminum hydroxide and modified boron nitride nanotubes, and the weight ratio of modified aluminum hydroxide to modified boron nitride nanotubes is 6:1.

[0065] The modified aluminum hydroxide is epoxy group-modified aluminum hydroxide, with the model ATH-5A and the manufacturer being Guangdong Haike New Materials Co., Ltd.

[0066] The preparation method of the modified boron nitride nanotubes includes the following steps: adding 50 mg of boron nitride nanotubes and 0.3 g of cetyltrimethylammonium bromide into 200 mL of sodium hydroxide aqueous solution (concentration is 0.1 mg / mL), ultrasonically dispersing evenly and then stirring at 80 °C for 1 hour, then adding 2 mL of tetraethyl orthosilicate ethanol solution (concentration is 0.2 mg / mL) and stirring at 80 °C for 10 hours and then filtering, adding the filtered product into a solution containing dopamine hydrochloride and stirring at 50-60 °C for 36 hours, filtering and drying to obtain the modified boron nitride nanotubes.

[0067] The solution containing dopamine hydrochloride is obtained by dissolving 1 g of dopamine hydrochloride in 350 mL of alkaline aqueous solution with a pH of 8.5, and the alkaline aqueous solution with a pH of 8.5 is prepared by adding 1 g of tris(hydroxymethyl)aminomethane to 600 mL of deionized water and then adjusting with 0.1 mol / L hydrochloric acid.

[0068] Among them, the width (diameter) of the boron nitride nanotube is 60 nm, the length is 20 microns, and the manufacturer purchased from is Dalian Yibang Technology Co., Ltd.

[0069] The leveling agent is BASF leveling agent FL 3600; the degassing agent is benzoin.

[0070] The preparation method of the coating is the same as that of Example 1 specifically.

[0071] Example 4

[0072] A high-insulation anti-corrosion protective coating, calculated by weight, the preparation raw materials include: 70 parts of epoxy resin, 8 parts of amine curing agent, 1 part of dimethylimidazole, 35 parts of filler, 1 part of leveling agent and 0.5 part of degassing agent.

[0073] The epoxy resin includes epoxy resin E-12 with an epoxy equivalent of 780 - 850 g / eq and hydrogenated bisphenol A epoxy resin with an epoxy equivalent of 200 - 300 g / eq. The weight ratio of epoxy resin E-12 to hydrogenated bisphenol A epoxy resin is 1:1.

[0074] The manufacturer purchased from of the epoxy resin E-12 is Hangzhou Yihuicheng Chemical Co., Ltd.

[0075] The epoxy equivalent of the hydrogenated bisphenol A epoxy resin is 215 g / eq, the manufacturer purchased from is Complex High-Tech (Shanghai), and the product name is EP-4080E.

[0076] The amine curing agent includes isophorone diamine and acrylate-modified diethylenetriamine; the weight ratio of isophorone diamine to acrylate-modified diethylenetriamine is 3:5.

[0077] In the acrylate-modified diethylenetriamine, the acrylate is 2-butyl octyl methacrylate.

[0078] The preparation method of the acrylate-modified diethylenetriamine includes the following steps: Mix 2-butyl octyl methacrylate and diethylenetriamine according to a certain molar ratio (molar ratio is 1:1), then react at 60 °C for 2 hours and then raise the temperature to 90 °C and continue to react for 2 hours to obtain it.

[0079] The filler includes modified aluminum hydroxide and modified boron nitride nanotubes, and the weight ratio of modified aluminum hydroxide to modified boron nitride nanotubes is 6:1.

[0080] The modified aluminum hydroxide is KH550-modified aluminum hydroxide. The preparation method of the KH550-modified aluminum hydroxide is as follows: Add 1 g of aluminum hydroxide into an ethanol aqueous solution containing KH550 (where: 100 mL of water, 400 mL of ethanol, and 50 mg of KH550).

[0081] The specific steps of the preparation method of the modified boron nitride nanotubes are the same as those in Example 1.

[0082] Among them, the width (diameter) of the boron nitride nanotubes is 60 nm, the length is 20 microns, and the manufacturer purchased from is Dalian Yibang Technology.

[0083] The leveling agent is BASF leveling agent FL 3600; the degassing agent is benzoin. FL 3600; the degassing agent is benzoin.

[0084] The preparation method of the coating is the same as that in Example 1.

[0085] Example 5

[0086] A high-insulation anti-corrosion protective coating, calculated by weight, the preparation raw materials include: 70 parts of epoxy resin, 8 parts of amine curing agent, 1 part of dimethylimidazole, 35 parts of filler, 1 part of leveling agent, and 0.5 part of degassing agent.

[0087] The epoxy resin includes epoxy resin E-12 with an epoxy equivalent of 780-850 g / eq and hydrogenated bisphenol A epoxy resin with an epoxy equivalent of 200-300 g / eq. The weight ratio of epoxy resin E-12 to hydrogenated bisphenol A epoxy resin is 1:1.

[0088] The manufacturer purchased from of the epoxy resin E-12 is Hangzhou Yihuicheng Chemical Co., Ltd.

[0089] The epoxy equivalent of the hydrogenated bisphenol A epoxy resin is 215 g / eq, the manufacturer purchased from is Complex High-Tech (Shanghai), and the product name is EP-4080E.

[0090] The amine curing agent includes isophorone diamine and acrylate-modified diethylenetriamine; the weight ratio of isophorone diamine to acrylate-modified diethylenetriamine is 3:5.

[0091] In the acrylate-modified diethylenetriamine, the acrylate is 2-butyl octyl methacrylate.

[0092] The preparation method of the acrylate-modified diethylenetriamine includes the following steps: Mix 2-butyl octyl methacrylate and diethylenetriamine according to a certain molar ratio (molar ratio is 1:1), then react at 60 °C for 2 hours and then heat up to 90 °C and continue to react for 2 hours to obtain it.

[0093] The filler includes modified aluminum hydroxide and modified boron nitride nanotubes, and the weight ratio of the modified aluminum hydroxide to the modified boron nitride nanotubes is 6:1.

[0094] The modified aluminum hydroxide is epoxy group modified aluminum hydroxide, with the model ATH-5A and the manufacturer Guangdong Haike New Materials Co., Ltd.

[0095] The preparation method of the modified boron nitride nanotubes includes the following steps: Add 50 mg of boron nitride nanotubes and 0.3 g of cetyltrimethylammonium bromide into 200 mL of sodium hydroxide aqueous solution (concentration 0.1 mg / mL), ultrasonically disperse evenly, stir at 80 °C for 1 hour, then add 2 mL of tetraethyl orthosilicate ethanol solution (concentration 0.2 mg / mL), stir at 80 °C for 10 hours and then filter. Add the filtered product into a solution containing KH 550 (where: 10 mL of water, 40 mL of ethanol, 3 mg of KH550), stir at 50 - 60 °C for 36 hours, filter and dry to obtain the modified boron nitride nanotubes.

[0096] Among them, the width (diameter) of the boron nitride nanotubes is 60 nm, the length is 20 microns, and the purchase manufacturer is Dalian Yibang Technology.

[0097] The leveling agent is BASF leveling agent FL 3600; the degassing agent is benzoin.

[0098] The preparation method of the coating is the same as that of Example 1 specifically.

[0099] Example 6

[0100] A high-insulation anti-corrosion protective coating, calculated by weight, the preparation raw materials include: 70 parts of epoxy resin, 8 parts of amine curing agent, 1 part of dimethylimidazole, 35 parts of filler, 1 part of leveling agent and 0.5 part of degassing agent.

[0101] The epoxy resin includes epoxy resin E-12 with an epoxy equivalent of 780 - 850 g / eq and hydrogenated bisphenol A epoxy resin with an epoxy equivalent of 200 - 300 g / eq, and the weight ratio of epoxy resin E-12 to hydrogenated bisphenol A epoxy resin is 1:1.

[0102] The purchase manufacturer of the epoxy resin E-12 is Hangzhou Yihuicheng Chemical Co., Ltd.

[0103] The epoxy equivalent of the hydrogenated bisphenol A epoxy resin is 215 g / eq, the purchase manufacturer is Complex High-Tech (Shanghai), and the product name is EP-4080E.

[0104] The amine curing agent includes isophorone diamine and acrylate-modified diethylenetriamine; the weight ratio of isophorone diamine to acrylate-modified diethylenetriamine is 3:5.

[0105] In the acrylate-modified diethylenetriamine, the acrylate is 2-butyl octyl methacrylate.

[0106] The preparation method of the acrylate-modified diethylenetriamine includes the following steps: mixing 2-butyl octyl methacrylate and diethylenetriamine according to a certain molar ratio (the molar ratio is 1:1), then reacting at 60 °C for 2 hours and then heating up to 90 °C and continuing to react for 2 hours to obtain it.

[0107] The filler includes modified aluminum hydroxide and modified boron nitride nanotubes, and the weight ratio of modified aluminum hydroxide to modified boron nitride nanotubes is 6:1.

[0108] Preferably, the modified aluminum hydroxide is epoxy-group modified aluminum hydroxide, with the model ATH-5A and the manufacturer being Guangdong Haike New Materials Co., Ltd.

[0109] The preparation method of the modified boron nitride nanosheets includes the following steps: adding 50 mg of boron nitride nanosheets and 0.3 g of cetyltrimethylammonium bromide into 200 mL of sodium hydroxide aqueous solution (concentration 0.1 mg / mL), ultrasonically dispersing evenly and then stirring at 80 °C for 1 hour, then adding 2 mL of tetraethyl orthosilicate ethanol solution (concentration 0.2 mg / mL) and stirring at 80 °C for 10 hours and then filtering, adding the filtered product into a solution containing dopamine hydrochloride and stirring at 50 - 60 °C for 36 hours, filtering and drying to obtain modified boron nitride nanotubes.

[0110] The solution containing dopamine hydrochloride is obtained by dissolving 1 g of dopamine hydrochloride in 350 mL of alkaline aqueous solution with a pH of 8.5, and the alkaline aqueous solution with a pH of 8.5 is prepared by adding 1 g of tris(hydroxymethyl)aminomethane to 600 mL of deionized water and then adjusting with 0.1 mol / L hydrochloric acid.

[0111] Among them, the thickness of the boron nitride nanosheets is 50 - 400 nm, and the purchasing manufacturer is Nanjing Pioneer Nano.

[0112] The leveling agent is BASF leveling agent FL 3600; the degassing agent is benzoin.

[0113] The preparation method of the coating is the same as that in Example 1 specifically.

[0114] Performance testing

[0115] Fire resistance test: Test the time (min) required for the back surface temperature to reach 800 °C, referring to the standard of GB / T6553-2014.

[0116] Electrical erosion test: Referring to the standard of GB / T 6553-2014, apply a voltage of 2.5 kV and test the maximum electrical erosion depth (mm).

[0117] Breakdown strength (kV / mm): Place the sample directly between the copper ball electrodes and continuously apply a DC voltage at a rate of 1 kV / s until the coating fails. The coating thickness range used for the dielectric breakdown test is 100 μm.

[0118] Abrasion resistance test: Refer to ASTM D4060-19. The wheel model is CS-10, with a load of 250 g and 50 revolutions of abrasion.

[0119]

[0120] From the test results of Examples 1-6, it can be seen that when 2-butyl octyl methacrylate is used to modify diethylenetriamine and the fillers are selected from epoxy group modified aluminum hydroxide and modified boron nitride nanotubes, the coating surface temperature reaches 580 °C in 48.3 minutes, the electrical erosion loss is only 0.68 mm, the breakdown strength reaches 178 kV / mm, and after 50 abrasions, the weight loss is 3.3 mg. When 2-butyl octyl methacrylate is replaced with other acrylates or diethylenetriamine is not modified, the fire resistance, breakdown strength, abrasion resistance, etc. of the coating all decrease to a certain extent. It may be that butyl and octyl endow the coating with appropriate flexibility, making the coating have better denseness and continuity, and the softening speed is moderate when heated; when the polydopamine modifying boron nitride is replaced with KH550 or the boron nitride nanotubes are replaced with boron nitride nanosheets, the fire resistance, breakdown strength, abrasion resistance, etc. of the coating all decrease to a certain extent.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high insulation anti-corrosion protective coating, characterized in that: Calculated by weight, the raw materials include: 60-80 parts of epoxy resin, 5-8 parts of amine curing agent, 0.8-1.2 parts of dimethylimidazole, and 25-40 parts of filler, wherein the filler includes at least one of modified aluminum hydroxide, boron nitride nanosheets, and modified boron nitride nanotubes.

2. The high insulation anticorrosion protective coating according to claim 1, characterized in that: The epoxy resin includes epoxy resin E-12 with an epoxy equivalent of 780-850 g / eq and hydrogenated bisphenol A epoxy resin with an epoxy equivalent of 200-300 g / eq.

3. The high insulation anticorrosion protective coating according to claim 2, characterized in that: The weight ratio of the epoxy resin E-12 to the hydrogenated bisphenol A epoxy resin is 1:1-1.

5.

4. The high insulation anticorrosion protective coating according to claim 1, characterized in that: The filler comprises modified aluminum hydroxide and modified boron nitride nanotubes, and the weight ratio of the modified aluminum hydroxide to the modified boron nitride nanotubes is 5-7:

1.

5. The high insulation anticorrosion protective coating according to claim 4, characterized in that: The modified aluminum hydroxide is epoxy-modified aluminum hydroxide.

6. The high insulation anticorrosion protective coating according to claim 4, characterized in that: The boron nitride nanotube has a width of 50-70 nm and a length of 10-30 microns.

7. The high insulation anticorrosion protective coating according to claim 1, characterized in that: The amine curing agent includes isophorone diamine and modified diethylene triamine.

8. The high insulation anticorrosion protective coating according to claim 1, characterized in that: The coating further comprises 0.5-1.5 parts of a leveling agent and 0.5-1.5 parts of a degassing agent.

9. The high insulation anticorrosion protective coating according to claim 8, characterized in that: The degassing agent is benzoin.

10. A method for preparing the high insulation anticorrosion protective coating according to any one of claims 1 to 9, characterized in that: The following steps are involved: Epoxy resin, amine curing agent, dimethylimidazole and filler are sequentially added into a stirring kettle and stirred evenly; then, the mixture is melted and extruded at high temperature, cooled and crushed to obtain a high-insulation anti-corrosion protective coating.

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