Insulator protective agent and preparation method thereof

Abstract

The present application provides an insulator protective agent and a preparation method thereof, the insulator protective agent comprising the following components: 40-50 parts by weight of fluorosilicone resin, 20-33 parts by weight of epoxy resin, 1.2-2.5 parts by weight of 10-ketostearic acid modified nano-silicon dioxide, 0.2-0.8 parts by weight of nano-silicon nitride, 0.3-2 parts by weight of defoamer, 0.1-0.3 parts by weight of surfactant and 5-30 parts by weight of solvent. The method comprises mixing 10-ketostearic acid modified nano-silicon dioxide, nano-silicon nitride, and part of the solvent to prepare a mixed solution A; mixing fluorosilicone resin, epoxy resin, defoamer and surfactant and the remaining solvent to prepare a mixed solution B; and mixing and stirring the mixed solution A with the mixed solution B to obtain an insulator protective agent. The insulator protective agent provided by the present application has excellent hydrophobic effect and adhesion.

Description

Technical Field

[0001] The present application relates to the technical field of insulation protection, and in particular to an insulator protective agent and a preparation method thereof. Background Art

[0002] Insulators are devices installed between conductors of different potentials or between conductors and grounded components, and are able to withstand voltage and mechanical stress. Insulators are inevitably exposed to adverse weather conditions such as rain, fog, dew, and snow in natural environments during use. Pollutants such as water droplets and particulate dust are easily attached to the surface of the insulators, which can easily cause flashover accidents in the power system under long-term operation, affecting the performance of the insulators, seriously threatening the safe operation of power transmission and transformation equipment, and causing huge losses to the national economy.

[0003] Insulator protective agent is a chemical coating material designed for the external insulating surface of power equipment (such as glass, porcelain, composite insulators, etc.), mainly used to clean, protect and improve the performance of insulators to prevent flashover, icing, corrosion and other problems. Existing insulator protective agents can play a good hydrophobic effect, but with long-term use, after being washed by rain and snow in the air, wind erosion, dust wear, etc., the protective agent has poor adhesion to the surface of the insulator, which reduces the insulation of the insulator and easily causes power system accidents. Summary of the invention

[0004] The present application provides an insulator protective agent and a preparation method thereof, so as to solve the above-mentioned problems mentioned in the background technology.

[0005] In a first aspect, the present application provides an insulator protective agent, comprising the following components in parts by weight:

[0006] 40-50 parts by weight of fluorosilicone resin, 20-33 parts by weight of epoxy resin, 1.2-2.5 parts by weight of 10-ketostearic acid modified nano silicon dioxide, 0.2-0.8 parts by weight of nano silicon nitride, 0.3-2 parts by weight of defoaming agent, 0.1-0.3 parts by weight of surfactant and 5-30 parts by weight of solvent.

[0007] Optionally, the particle size of nano silicon nitride is 10-50 nm.

[0008] Optionally, the defoaming agent includes an organosilicon defoaming agent and / or an organosilicon modified defoaming agent.

[0009] Optionally, the surfactant includes any one or more of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, and sorbitan fatty acid ester.

[0010] Optionally, the solvent includes one or more of water, acetonitrile, methanol, ethanol, isopropanol, n-butanol, and isobutanol.

[0011] In a second aspect, the present application provides a method for preparing an insulator protective agent, the preparation method is used to prepare the above-mentioned insulator protective agent, and the preparation method comprises the following steps:

[0012] (1) Add 10-keto stearic acid modified nano-silicon dioxide, nano-silicon nitride, and 10-20% of the weight of the solvent to a first stirred tank, and stir ultrasonically for 10-30 minutes to obtain a mixed solution A;

[0013] (2) Add fluorosilicone resin, epoxy resin, defoamer and surfactant into the second stirred tank according to weight, take the remaining solvent, stir for 5-10 minutes, and obtain mixed solution B;

[0014] (3) Stir the mixed solution A and the mixed solution B for 5-10 minutes to obtain an insulator protective agent.

[0015] Optionally, the preparation method further includes the synthesis of 10-keto stearic acid modified nano-silicon dioxide, which specifically includes the following steps:

[0016] (1) dispersing 10-keto stearic acid in anhydrous ethanol at a temperature of 28-35° C. by ultrasonication to obtain a 10-keto stearic acid dispersion;

[0017] (2) Ultrasonic dispersion of nano-silicon dioxide in anhydrous ethanol at a temperature of 28-35° C. to obtain a nano-silicon dioxide dispersion;

[0018] (3) Mixing the 10-keto stearic acid dispersion and the nano-silica dispersion, and adding acid dropwise while stirring until the pH value is 1-3, and keeping the temperature to react for 0.5-1.5 hours to obtain a 10-keto stearic acid modified nano-silica crude liquid;

[0019] (4) The crude liquid of 10-keto stearic acid modified nano-silica is centrifuged and the obtained solid is dried to obtain 10-keto stearic acid modified nano-silica.

[0020] Optionally, the mass volume ratio of 10-keto stearic acid to anhydrous ethanol is 1-5 g / 100 mL, and the mass volume ratio of nano-silicon dioxide to anhydrous ethanol is 0.5-3 g / 40 mL.

[0021] Optionally, the mass ratio of 10-keto stearic acid to nano silicon dioxide is 0.15-0.25:1.

[0022] Optionally, the reaction temperature is kept at 45-55°C.

[0023] The insulator protective agent and preparation method thereof provided in the present application realize the preparation of the insulator protective agent, and have the following beneficial effects compared with the prior art:

[0024] (1) By using fluorosilicone resin and epoxy resin as the base material and film-forming material of the insulator protective agent, a protective film with low surface tension is formed on the surface of the insulator, which makes the protective film have good hydrophobicity and adhesion, thereby extending the service life of the insulator. By using 10-keto stearic acid-modified nano-silicon dioxide and nano-silicon nitride as fillers, the density of the protective agent after film formation on the insulator surface can be improved, and the mechanical properties of the protective film can also be improved. Nano-silicon dioxide modified with 10-keto stearic acid improves the hydrophobicity of the insulator protective agent after film formation, preventing rain, snow, and ice from adhering to the surface of the insulator, allowing the insulator to maintain good insulation performance. At the same time, a network structure can be formed between the fluorosilicone resin and the epoxy resin, and 10-ketostearic acid modified nano-silicon dioxide and nano-silicon nitride are filled in the network structure formed between the fluorosilicone resin and the epoxy resin, which not only improves the adhesion between the protective film and the insulator surface, but also further improves the density and stability of the protective film, so that the protective agent can have long-term and stable hydrophobic properties after film formation, thereby extending the protection period of the protective agent on the insulator.

[0025] (2) The addition of 3-bromo-2-nitroanisole can further improve the adhesion of the protective agent after film formation. The presence of bromine atoms, nitro groups and methoxy groups in 3-bromo-2-nitroanisole can not only further improve the hydrophobic effect of the protective agent, but also the presence of bromine atoms and nitro groups can increase the interaction between the protective agent and the substrate during the film formation process. The presence of the benzene ring has strong rigidity, which can improve the adhesion between the protective agent and the surface of the insulator after film formation, thereby increasing the service life of the insulator.

[0026] (3) The special ratio of 10-keto stearic acid and nano-silica can not only improve the reaction efficiency of 10-keto stearic acid and the hydroxyl groups on the surface of nano-silica, but also introduce long-chain alkyl groups. At the same time, esters are generated during the reaction, and the interaction with water molecules is weak. The presence of keto carbonyl groups in 10-keto stearic acid further improves the hydrophobicity of the modified nano-silica. It can also make some free 10-keto stearic acid exist in the protective agent. During the film formation process, the carboxyl end of the free 10-keto stearic acid can interact with fluorosilicone resin and epoxy resin, so that the free 10-keto stearic acid can be filled in the network structure formed between fluorosilicone resin and epoxy resin, and the alkyl end of the free 10-keto stearic acid is dispersed outside the network structure. Such molecular interlinking and synergistic interaction with the network structure improve the adhesion between the protective film and the insulator, while improving the strength and hydrophobicity of the protective film, thereby extending the service life of the insulator.

[0027] (4) The insulator protective agent provided in the present application has excellent anti-icing performance, which enables the protective agent provided in the present application to be used in areas with relatively cold temperatures, thus making the protective agent have a wider range of uses.

[0028] (5) The preparation method of the insulator protective agent provided in this application is simple and easy to promote in the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 The contact angles of the insulator protective agents provided in Examples 1 to 6 of the present application and Comparative Examples 1 to 6 after film formation, and the contact angle test results after the falling sand method experiment. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0032] In a first aspect, the present application provides an insulator protective agent, comprising the following components in parts by weight:

[0033] 40-50 parts by weight of fluorosilicone resin, 20-33 parts by weight of epoxy resin, 1.2-2.5 parts by weight of 10-ketostearic acid modified nano silicon dioxide, 0.2-0.8 parts by weight of nano silicon nitride, 0.3-2 parts by weight of defoaming agent, 0.1-0.3 parts by weight of surfactant and 5-30 parts by weight of solvent.

[0034] Specifically, fluorosilicone resin and epoxy resin are the base materials and film-forming substances of insulator protective agents, which can form a protective film with low surface tension on the surface of the insulator. At the same time, fluorosilicone resin and epoxy resin have good hydrophobicity, which can prevent the adhesion of rain, snow and dust. They also have good resistance to chemical media such as acid, alkali, salt water and salt spray, which can isolate the surface of the insulator from the external environment and have good protective performance for the insulator. Fluorosilicone resin has good adhesion, and after curing, it can form a high-hardness and flexible protective film on the surface of the insulator, which prolongs the service life of the insulator.

[0035] 10-keto stearic acid modified nano-silicon dioxide and nano-silicon nitride are used as fillers. The addition of the two nano-materials can improve the compactness of the protective agent after film formation on the surface of the insulator. At the same time, nano-silicon nitride has a large hardness, which can improve the mechanical properties of the protective film. Nano-silicon dioxide is modified by 10-keto stearic acid, so that the surface of the nano-silicon dioxide is loaded with 10-keto stearic acid. In this way, 10-keto stearic acid is used as a modifier. The long chain of 10-keto stearic acid improves the hydrophobicity of nano-silicon dioxide, which can improve the hydrophobicity of the insulator protective agent after film formation, prevent rain, snow and ice from adhering to the surface of the insulator, and enable the insulator to maintain good insulation performance. At the same time, a network structure can be formed between the fluorosilicone resin and the epoxy resin. The two work together to improve the hydrophobic properties of the protective agent after film formation. The 10-ketostearic acid modified nano-silicon dioxide and nano-silicon nitride have very small particle sizes and can be filled in the network structure formed between the fluorosilicone resin and the epoxy resin. This not only improves the adhesion between the protective film and the insulator surface, but also further improves the density and stability of the protective film, so that the protective agent can have long-term and stable hydrophobic properties after film formation, avoiding the adhesion of rain, snow, ice and salt water to the insulator surface, thereby avoiding further adhesion of dust particles in the air, extending the protection period of the protective agent on the insulator, and allowing the insulator to be stably used in power transmission and transformation equipment for a long period of time.

[0036] Defoaming agents can effectively eliminate the foam in the protective agent, making the protective agent more uniform and stable, which in turn helps to improve the compactness of the protective film formed on the surface of the insulator, and improve the adhesion between the protective film and the insulator, thereby improving the strength of the protective film.

[0037] The surfactant can improve the dispersion stability of 10-keto stearic acid modified nano-silicon dioxide and nano-silicon nitride in the protective agent, improve the leveling and uniformity of the protective agent, and reduce the surface tension of the protective agent, which is beneficial to improving the uniformity and stability of the protective film.

[0038] Furthermore, the insulator protective agent provided in the present application also includes 0.05-0.1 parts by weight of 3-bromo-2-nitroanisole. The presence of bromine atoms, nitro groups and methoxy groups in 3-bromo-2-nitroanisole can not only further improve the hydrophobic effect of the protective agent, but also the presence of bromine atoms and nitro groups can increase the interaction between the protective agent and the substrate during the film formation process, thereby increasing the adhesion between the protective agent and the insulator surface after film formation, thereby increasing the service life of the insulator.

[0039] The present application realizes the protection of the surface of the insulator through the above scheme. By using fluorosilicone resin and epoxy resin as the base material and film-forming material of the insulator protective agent, a protective film with low surface tension is formed on the surface of the insulator, so that the protective film has good hydrophobicity and adhesion, and the service life of the insulator is extended. By using 10-keto stearic acid-modified nano-silicon dioxide and nano-silicon nitride as fillers, the density of the protective agent after film formation on the insulator surface can be improved, and the mechanical properties of the protective film can be improved. Nano-silicon dioxide modified with 10-keto stearic acid improves the hydrophobicity of the insulator protective agent after film formation, prevents rain, snow, and ice from adhering to the surface of the insulator, and allows the insulator to maintain good insulation performance. At the same time, a network structure can be formed between the fluorosilicone resin and the epoxy resin, and 10-ketostearic acid modified nano-silicon dioxide and nano-silicon nitride are filled in the network structure formed between the fluorosilicone resin and the epoxy resin, which not only improves the adhesion between the protective film and the insulator surface, but also further improves the density and stability of the protective film, so that the protective agent can have long-term and stable hydrophobic properties after film formation, thereby extending the protection period of the protective agent on the insulator.

[0040] Optionally, the particle size of nano silicon nitride is 10-50 nm.

[0041] Specifically, a suitable nano silicon nitride particle size helps to improve the density and flexibility of the protective agent after film formation, improves the mechanical properties of the protective film, helps the protective film to be stably attached to the surface of the insulator for a long time, and extends the service life of the insulator.

[0042] Optionally, the defoamer includes an organosilicon defoamer and / or an organosilicon modified defoamer, including but not limited to one or more of polydimethylsiloxane, ethylene glycol siloxane, and polyether-siloxane copolymer.

[0043] Optionally, the surfactant includes any one or more of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, and sorbitan fatty acid ester.

[0044] Optionally, the solvent includes one or more of water, acetonitrile, methanol, ethanol, isopropanol, n-butanol, and isobutanol.

[0045] In a second aspect, the present application provides a method for preparing an insulator protective agent, the preparation method is used to prepare the above-mentioned insulator protective agent, and the preparation method comprises the following steps:

[0046] (1) Add 10-keto stearic acid modified nano-silicon dioxide, nano-silicon nitride, and 10-20% of the weight of the solvent to a first stirred tank, and stir ultrasonically for 10-30 minutes to obtain a mixed solution A;

[0047] (2) Add fluorosilicone resin, epoxy resin, defoamer and surfactant into the second stirred tank according to weight, take the remaining solvent, stir for 5-10 minutes, and obtain mixed solution B;

[0048] (3) Stir the mixed solution A and the mixed solution B for 5-10 minutes to obtain an insulator protective agent.

[0049] Specifically, 10-keto stearic acid modified nano silicon dioxide and nano silicon nitride are first dispersed into a solvent with a weight of 10-20% by ultrasonic dispersion to form a mixed solution A, and then fluorosilicone resin, epoxy resin, defoamer and residual surfactant solvent are stirred and mixed to obtain a mixed solution B, and finally the mixed solution A and the mixed solution B are stirred to obtain an insulator protective agent. In this way, the nanomaterial and other components are dispersed separately and then mixed, which avoids the nanomaterial from directly contacting with the fluorosilicone resin, epoxy resin, and surfactant during the dispersion process to produce agglomeration, improves the dispersion efficiency, and thus improves the preparation efficiency of the protective agent.

[0050] The obtained insulator protective agent is applied to the surface of the insulator by spraying, brushing, scraping, spin coating, etc., and left to dry at room temperature to form a hydrophobic protective film on the surface of the insulator. The insulator protective agent provided by the present application can be applied to insulators installed indoors or outdoors.

[0051] Optionally, the preparation method further includes the synthesis of 10-keto stearic acid modified nano-silicon dioxide, which specifically includes the following steps:

[0052] (1) dispersing 10-keto stearic acid in anhydrous ethanol at a temperature of 28-35° C. by ultrasonic dispersion for 10-30 min to obtain a 10-keto stearic acid dispersion;

[0053] (2) Ultrasonic dispersion of nano-silicon dioxide in anhydrous ethanol at a temperature of 28-35° C. for 10-30 min to obtain a nano-silicon dioxide dispersion;

[0054] (3) Mixing the 10-keto stearic acid dispersion and the nano-silica dispersion, and adding acid dropwise while stirring to adjust the pH value to 1-3, and keeping the temperature for reaction for 0.5-1.5 hours to obtain a 10-keto stearic acid modified nano-silica crude liquid;

[0055] (4) The crude liquid of 10-keto stearic acid modified nano-silica is centrifuged and the obtained solid is dried to obtain 10-keto stearic acid modified nano-silica.

[0056] Specifically, 10-keto stearic acid and nano silicon dioxide are dispersed in anhydrous ethanol respectively to obtain 10-keto stearic acid dispersion and nano silicon dioxide dispersion. Such a setting can make 10-keto stearic acid and nano silicon dioxide evenly dispersed, which is conducive to the reaction and can also avoid the agglomeration of nano materials. Then the 10-keto stearic acid dispersion is mixed with the nano silicon dioxide dispersion, and acid is added dropwise under stirring to adjust the pH value to 1-3, which helps the carboxyl group in 10-keto stearic acid to react with the hydroxyl group on the surface of nano silicon dioxide, improves the hydrophobicity of 10-keto stearic acid modified nano silicon dioxide, and then improves the hydrophobicity of the protective agent after film formation.

[0057] The acid includes organic acid and / or inorganic acid, specifically one or more of hydrochloric acid, sulfuric acid, nitric acid and acetic acid. The particle size of nano-silicon dioxide is 30-70 nm.

[0058] Optionally, the mass volume ratio of 10-keto stearic acid to anhydrous ethanol is 1-5 g / 100 mL, and the mass volume ratio of nano silicon dioxide to anhydrous ethanol is 0.5-3 g / 40 mL, so that 10-keto stearic acid and nano silicon dioxide can be fully dispersed in anhydrous ethanol, thereby improving the subsequent reaction efficiency.

[0059] Optionally, the mass ratio of 10-keto stearic acid to nano silicon dioxide is 0.15-0.25:1.

[0060] Optionally, the reaction temperature is kept at 45-55°C.

[0061] The technical solution of the present application is described in detail below with reference to specific embodiments.

[0062] Example 1

[0063] A method for preparing an insulator protective agent comprises the following steps:

[0064] (1) Synthesis of 10-keto stearic acid modified nano-silica:

[0065] (110) 10-keto stearic acid was ultrasonically dispersed in anhydrous ethanol at 28 °C for 10 min to obtain a 10-keto stearic acid dispersion.

[0066] (120) Nano-silicon dioxide with a particle size of 30-70 nm was ultrasonically dispersed in anhydrous ethanol at a temperature of 28 °C for 10 min to obtain a nano-silicon dioxide dispersion;

[0067] (130) The 10-keto stearic acid dispersion and the nano-silica dispersion were mixed, and sulfuric acid was added dropwise under stirring to adjust the pH value to 1. The mixture was kept at 45°C for 0.5 h to obtain a 10-keto stearic acid-modified nano-silica crude solution.

[0068] Among them, the mass volume ratio of 10-keto stearic acid to anhydrous ethanol is 1 g / 100 mL, the mass volume ratio of nano-silicon dioxide to anhydrous ethanol is 0.5 g / 40 mL, and the mass ratio of 10-keto stearic acid to nano-silicon dioxide is 0.15:1.

[0069] (140) The crude 10-keto stearic acid-modified nano-silica solution was centrifuged, and the obtained solid was dried at 60 °C to a constant weight to obtain 10-keto stearic acid-modified nano-silica.

[0070] (2) Add 10-keto stearic acid modified nano-silicon dioxide, nano-silicon nitride with a particle size of 10-50 nm, and 10% of the weight of the solvent to the first stirred tank, and stir ultrasonically for 10 minutes to obtain a mixed solution A, wherein the solvent is anhydrous ethanol;

[0071] (3) Add fluorosilicone resin, epoxy resin, defoamer and surfactant to the second stirred tank according to weight, take the remaining solvent, stir for 5 minutes, and obtain a mixed solution B; the surfactant is fatty alcohol polyoxyethylene ether, and the defoamer is ethylene glycol siloxane;

[0072] 40 parts by weight of fluorosilicone resin, 20 parts by weight of epoxy resin, 1.2 parts by weight of 10-keto stearic acid modified nano-silicon dioxide, 0.2 parts by weight of nano-silicon nitride, 0.3 parts by weight of defoaming agent, 0.1 parts by weight of surfactant and 5 parts by weight of solvent.

[0073] (4) Stir the mixed solution A and the mixed solution B for 5 minutes to obtain an insulator protective agent.

[0074] Example 2

[0075] A method for preparing an insulator protective agent comprises the following steps:

[0076] (1) Synthesis of 10-keto stearic acid modified nano-silica:

[0077] (110) 10-keto stearic acid was ultrasonically dispersed in anhydrous ethanol at 30 °C for 20 min to obtain a 10-keto stearic acid dispersion.

[0078] (120) Nano-silicon dioxide with a particle size of 30-70 nm was ultrasonically dispersed in anhydrous ethanol at a temperature of 30 °C for 20 min to obtain a nano-silicon dioxide dispersion;

[0079] (130) The 10-keto stearic acid dispersion and the nano-silica dispersion were mixed, and sulfuric acid was added dropwise under stirring to adjust the pH value to 2. The mixture was kept at 50 °C for 1 h to obtain a 10-keto stearic acid modified nano-silica crude solution.

[0080] Among them, the mass volume ratio of 10-keto stearic acid to anhydrous ethanol is 3g / 100mL, the mass volume ratio of nano-silicon dioxide to anhydrous ethanol is 2g / 40mL, and the mass ratio of 10-keto stearic acid to nano-silicon dioxide is 0.2:1.

[0081] (140) The crude 10-keto stearic acid-modified nano-silica solution was centrifuged, and the obtained solid was dried at 70 °C to a constant weight to obtain 10-keto stearic acid-modified nano-silica.

[0082] (2) Add 10-keto stearic acid modified nano-silicon dioxide, nano-silicon nitride with a particle size of 10-50 nm, and 15% of the weight of the solvent to the first stirred tank, and stir ultrasonically for 20 minutes to obtain a mixed solution A, wherein the solvent is anhydrous ethanol;

[0083] (3) Add fluorosilicone resin, epoxy resin, defoamer and surfactant to the second stirred tank according to weight, take the remaining solvent, stir for 7 minutes, and obtain a mixed solution B; the surfactant is fatty alcohol polyoxyethylene ether, and the defoamer is ethylene glycol siloxane;

[0084] 45 parts by weight of fluorosilicone resin, 26 parts by weight of epoxy resin, 1.8 parts by weight of 10-keto stearic acid modified nano-silicon dioxide, 0.5 parts by weight of nano-silicon nitride, 1 part by weight of defoaming agent, 0.2 parts by weight of surfactant and 15 parts by weight of solvent.

[0085] (4) Mixed solution A and mixed solution B are stirred for 7 minutes to obtain an insulator protective agent.

[0086] Example 3

[0087] A method for preparing an insulator protective agent comprises the following steps:

[0088] (1) Synthesis of 10-keto stearic acid modified nano-silica:

[0089] (110) 10-keto stearic acid was ultrasonically dispersed in anhydrous ethanol at 35 °C for 30 min to obtain a 10-keto stearic acid dispersion.

[0090] (120) Nano-silicon dioxide with a particle size of 30-70 nm was ultrasonically dispersed in anhydrous ethanol at a temperature of 35 °C for 30 min to obtain a nano-silicon dioxide dispersion;

[0091] (130) The 10-keto stearic acid dispersion was mixed with the nano-silica dispersion, and sulfuric acid was added dropwise under stirring to adjust the pH value to 3. The mixture was kept at 55 °C for 1.5 h to obtain a 10-keto stearic acid modified nano-silica crude solution.

[0092] Among them, the mass volume ratio of 10-keto stearic acid to anhydrous ethanol is 5g / 100mL, the mass volume ratio of nano-silicon dioxide to anhydrous ethanol is 3g / 40mL, and the mass ratio of 10-keto stearic acid to nano-silicon dioxide is 0.25:1.

[0093] (140) The crude 10-keto stearic acid-modified nano-silica solution was centrifuged, and the obtained solid was dried at 75 °C to a constant weight to obtain 10-keto stearic acid-modified nano-silica.

[0094] (2) Add 10-keto stearic acid modified nano-silicon dioxide, nano-silicon nitride with a particle size of 10-50 nm, and 20% of the weight of the solvent to the first stirred tank, and stir ultrasonically for 30 minutes to obtain a mixed solution A, wherein the solvent is anhydrous ethanol;

[0095] (3) Add fluorosilicone resin, epoxy resin, defoamer and surfactant to the second stirred tank according to weight, take the remaining solvent, stir for 10 minutes, and obtain a mixed solution B; the surfactant is fatty alcohol polyoxyethylene ether, and the defoamer is ethylene glycol siloxane;

[0096] 50 parts by weight of fluorosilicone resin, 33 parts by weight of epoxy resin, 2.5 parts by weight of 10-keto stearic acid modified nano-silicon dioxide, 0.8 parts by weight of nano-silicon nitride, 2 parts by weight of defoaming agent, 0.3 parts by weight of surfactant and 30 parts by weight of solvent.

[0097] (4) Stir the mixed solution A and the mixed solution B for 10 minutes to obtain an insulator protective agent.

[0098] Example 4

[0099] A method for preparing an insulator protective agent comprises the following steps:

[0100] The difference from Example 2 is that:

[0101] (2) Add 10-keto stearic acid modified nano-silicon dioxide, nano-silicon nitride with a particle size of 10-50 nm, and 15% of the weight of the solvent to the first stirred tank, and stir ultrasonically for 20 minutes to obtain a mixed solution A, wherein the solvent is anhydrous ethanol;

[0102] (3) Add fluorosilicone resin, epoxy resin, defoamer, 3-bromo-2-nitroanisole and surfactant to a second stirred tank according to weight, take the remaining solvent, stir for 7 minutes, and obtain a mixed solution B; the surfactant is fatty alcohol polyoxyethylene ether, and the defoamer is ethylene glycol siloxane;

[0103] 45 parts by weight of fluorosilicone resin, 26 parts by weight of epoxy resin, 1.8 parts by weight of 10-keto stearic acid modified nano-silicon dioxide, 0.5 parts by weight of nano-silicon nitride, 1 part by weight of defoamer, 0.2 parts by weight of surfactant, 0.05 parts by weight of 3-bromo-2-nitroanisole and 15 parts by weight of solvent.

[0104] (4) Mixed solution A and mixed solution B are stirred for 7 minutes to obtain an insulator protective agent.

[0105] Example 5

[0106] A method for preparing an insulator protective agent comprises the following steps:

[0107] The difference from Example 2 is that:

[0108] (2) Add 10-keto stearic acid modified nano-silicon dioxide, nano-silicon nitride with a particle size of 10-50 nm, and 15% of the weight of the solvent to the first stirred tank, and stir ultrasonically for 20 minutes to obtain a mixed solution A, wherein the solvent is anhydrous ethanol;

[0109] (3) Add fluorosilicone resin, epoxy resin, defoamer, 3-bromo-2-nitroanisole and surfactant to a second stirred tank according to weight, take the remaining solvent, stir for 7 minutes, and obtain a mixed solution B; the surfactant is fatty alcohol polyoxyethylene ether, and the defoamer is ethylene glycol siloxane;

[0110] 45 parts by weight of fluorosilicone resin, 26 parts by weight of epoxy resin, 1.8 parts by weight of 10-keto stearic acid modified nano-silicon dioxide, 0.5 parts by weight of nano-silicon nitride, 1 part by weight of defoamer, 0.2 parts by weight of surfactant, 0.08 parts by weight of 3-bromo-2-nitroanisole and 15 parts by weight of solvent.

[0111] (4) Mixed solution A and mixed solution B are stirred for 7 minutes to obtain an insulator protective agent.

[0112] Example 6

[0113] A method for preparing an insulator protective agent comprises the following steps:

[0114] The difference from Example 2 is that:

[0115] (2) Add 10-keto stearic acid modified nano-silicon dioxide, nano-silicon nitride with a particle size of 10-50 nm, and 15% of the weight of the solvent to the first stirred tank, and stir ultrasonically for 20 minutes to obtain a mixed solution A, wherein the solvent is anhydrous ethanol;

[0116] (3) Add fluorosilicone resin, epoxy resin, defoamer, 3-bromo-2-nitroanisole and surfactant to a second stirred tank according to weight, take the remaining solvent, stir for 7 minutes, and obtain a mixed solution B; the surfactant is fatty alcohol polyoxyethylene ether, and the defoamer is ethylene glycol siloxane;

[0117] 45 parts by weight of fluorosilicone resin, 26 parts by weight of epoxy resin, 1.8 parts by weight of 10-ketostearic acid modified nano-silicon dioxide, 0.5 parts by weight of nano-silicon nitride, 1 part by weight of defoamer, 0.2 parts by weight of surfactant, 0.1 parts by weight of 3-bromo-2-nitroanisole and 15 parts by weight of solvent.

[0118] (4) Mixed solution A and mixed solution B are stirred for 7 minutes to obtain an insulator protective agent.

[0119] Comparative Example 1

[0120] A method for preparing an insulator protective agent comprises the following steps:

[0121] The difference from Example 5 is that:

[0122] (130) In the synthesis steps of 10-keto stearic acid modified nano-silica: the mass ratio of 10-keto stearic acid to nano-silica is 0.14:1.

[0123] Comparative Example 2

[0124] A method for preparing an insulator protective agent comprises the following steps:

[0125] The difference from Example 5 is that:

[0126] (130) In the synthesis steps of 10-keto stearic acid modified nano-silica: the mass ratio of 10-keto stearic acid to nano-silica is 0.26:1.

[0127] Comparative Example 3

[0128] A method for preparing an insulator protective agent comprises the following steps:

[0129] The difference from Example 5 is that:

[0130] (3) No 10-keto stearic acid modified nano-silica is added to the insulator protective agent.

[0131] Comparative Example 4

[0132] A method for preparing an insulator protective agent comprises the following steps:

[0133] The difference from Example 5 is that:

[0134] (3) 10-Ketostearic acid modified nano-silica and 3-bromo-2-nitroanisole are not added to the insulator protective agent.

[0135] Comparative Example 5

[0136] A method for preparing an insulator protective agent comprises the following steps:

[0137] The difference from Example 5 is that:

[0138] (130) The 10-keto stearic acid dispersion was mixed with the nano-silica dispersion and reacted at 45 °C for 0.5 h to obtain a crude solution of 10-keto stearic acid-modified nano-silica.

[0139] Experimental Example 1

[0140] Rinse the surface of the alumina ceramic with anhydrous ethanol for at least three times and dry it for later use. Use the insulator protective agent provided in this application to spray the surface of the alumina ceramic, with the nozzle 30 cm away from the surface of the alumina ceramic, the spraying pressure is 100 psi, the spraying speed is 5 cm / s, and the spraying is done twice. After the spraying is completed, place it at room temperature for 48 hours to obtain a protective film.

[0141] According to the method of national standard GB / T 30447-2013 "Nanofilm contact angle measurement method", the contact angles of the insulator protective agents provided by Examples 1 to 6 and Comparative Examples 1 to 5 were tested. At least 3 parallel tests were performed for each test, and the average value was taken to obtain the test results as follows: Figure 1 shown.

[0142] Experimental Example 2

[0143] The same spraying method as in Experimental Example 1 was used to test the wear resistance of the protective film obtained from the insulator protective agent provided in Examples 1 to 6 and Comparative Examples 1 to 5 of the present application. The wear resistance test was performed using the falling sand method experimental device and the method specified in GB / T23988-2009 "Falling sand method for measuring the wear resistance of coatings". The specific method was to use 100 mL of standard sand to perform a falling sand test and then measure the contact angle at the impacted point. At least 3 parallel tests were performed for each test, and the average value was taken to obtain the test results as shown below. Figure 1 shown.

[0144] Depend on Figure 1It can be seen that the insulator protective agent provided by the present application has excellent hydrophobicity after being sprayed on the ceramic surface to form a film. Comparing Examples 1 to 3 and Comparative Example 3, it is shown that the addition of 10-keto stearic acid modified nano-silica improves the hydrophobicity of nano-silica, and then can improve the hydrophobicity of the insulator protective agent after film formation, avoiding rain, snow and ice from adhering to the surface of the insulator, so that the insulator maintains good insulation performance. Comparing Examples 1 to 3 and Examples 4 to 6, it can be seen that after adding 3-bromo-2-nitroanisole and after the falling sand method experiment, the contact angle of the protective film has been further improved, indicating that the addition of 3-bromo-2-nitroanisole makes the protective film formed by the insulator protective agent have more excellent hydrophobic properties.

[0145] At the same time, through comparative examples 1 and 2, it is illustrated that in the synthesis process of 10-keto stearic acid modified nano-silica, by adjusting the ratio of 10-keto stearic acid to modified nano-silica, the hydrophobic properties of the formed protective film can be improved. The nano-silica modified with 10-keto stearic acid introduces a long-chain alkyl group, so that the modified nano-silica further improves the hydrophobic properties, and part of the free 10-keto stearic acid is present in the protective agent. During the film formation process, the carboxyl end of the free 10-keto stearic acid can interact with the fluorosilicone resin and the epoxy resin, so that the free 10-keto stearic acid can be filled in the network structure formed between the fluorosilicone resin and the epoxy resin, and the alkyl end of the free 10-keto stearic acid is dispersed outside the network structure. Such intermolecular mutual intersection and synergistic action with the network structure improve the adhesion between the protective film and the insulator, and at the same time improve the strength and hydrophobicity of the protective film.

[0146] Experimental Example 3

[0147] The same spraying method as in Experimental Example 1 was used to test the adhesion of the protective film obtained from the insulator protective agent provided in Examples 1 to 6 and Comparative Examples 1 to 5 of the present application. The adhesion was tested using a BEVS2202 cross-cut tester according to the method specified in GB / T9286-2021 "Cross-cut test for paint and varnish films". At least 3 parallel tests were performed for each test, and the average value was taken to obtain the test results shown in Table 1.

[0148] Experimental Example 4

[0149] Anti-icing time: Place the sprayed alumina ceramic in an environment with a temperature of -20°C, use a spray device to spray water on the sample surface, the water flow rate is 10ml / s, and detect the time when the ice area on the sample surface reaches 5%, and compare it with the alumina ceramic without spraying the insulator protective agent. At least 3 parallel tests are carried out for each test, and the average value is taken. The test results are shown in Table 1.

[0150] Table 1

[0151] Adhesion / ISO grade Anti-icing time / h Example 1 Level 1 >2500 Example 2 Level 1 >2500 Example 3 Level 1 >2500 Example 4 Level 1 >2700 Example 5 Level 1 >2700 Example 6 Level 1 >2700 Comparative Example 1 Level 2 >2000 Comparative Example 2 Level 2 >2000 Comparative Example 3 Level 2 1200-1500 Comparative Example 4 Level 3 100-160 Comparative Example 5 Level 3 50-70 No protective agent sprayed - <2

[0152] As can be seen from Table 1, the insulator protective agent provided by the present application is applied to the surface of the insulator to form a protective film, and the protective film has a strong adhesion to the surface of the insulator, thereby increasing the service life of the protective film, which is beneficial to the long-term use of the insulator. Combined with the anti-icing time test results, it can be seen that the insulator protective agent provided by the present application has good anti-icing performance, which enables the protective agent provided by the present application to be applied to areas with relatively cold temperatures, making the protective agent more widely used.

[0153] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An insulator protective agent, characterized in that: The composition comprises the following components in parts by weight: 40-50 parts by weight of fluorosilicone resin, 20-33 parts by weight of epoxy resin, 1.2-2.5 parts by weight of 10-ketostearic acid modified nano-silicon dioxide, 0.2-0.8 parts by weight of nano-silicon nitride, 0.3-2 parts by weight of defoaming agent, 0.1-0.3 parts by weight of surfactant, 5-30 parts by weight of solvent and 0.05-0.1 parts by weight of 3-bromo-2-nitroanisole.

2. The insulator protective agent according to claim 1, characterized in that: The particle size of the nano silicon nitride is 10-50nm.

3. The insulator protective agent according to claim 1, characterized in that: The defoaming agent includes an organosilicon defoaming agent and / or an organosilicon modified defoaming agent.

4. The insulator protective agent according to claim 1, characterized in that: The surfactant includes any one or more of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, and sorbitan fatty acid ester.

5. The insulator protective agent according to claim 1, characterized in that: The solvent includes one or more of water, acetonitrile, methanol, ethanol, isopropanol, n-butanol, and isobutanol.

6. A method for preparing an insulator protective agent, characterized in that: The preparation method is used to prepare the insulator protective agent according to any one of claims 1 to 5, and the preparation method comprises the following steps: (1) Add 10-keto stearic acid modified nano-silicon dioxide, the nano-silicon nitride, and 10-20% of the weight of the solvent to a first stirred tank, and stir ultrasonically for 10-30 minutes to obtain a mixed solution A; (2) adding the fluorosilicone resin, the epoxy resin, the defoamer, the surfactant, and 3-bromo-2-nitroanisole to a second stirred tank according to weight, and then taking the remaining solvent and stirring for 5-10 minutes to obtain a mixed solution B; (3) Stir the mixed solution A and the mixed solution B for 5-10 minutes to obtain the insulator protective agent.

7. The method for preparing the insulator protective agent according to claim 6, characterized in that: The preparation method also includes the synthesis of the 10-keto stearic acid modified nano silicon dioxide, which specifically includes the following steps: (1) dispersing 10-keto stearic acid in anhydrous ethanol at a temperature of 28-35° C. by ultrasonication to obtain a 10-keto stearic acid dispersion; (2) Ultrasonic dispersion of nano-silicon dioxide in anhydrous ethanol at a temperature of 28-35° C. to obtain a nano-silicon dioxide dispersion; (3) mixing the 10-keto stearic acid dispersion and the nano-silicon dioxide dispersion, and adding acid dropwise while stirring until the pH value is 1-3, and keeping the temperature to react for 0.5-1.5 hours to obtain the 10-keto stearic acid modified nano-silicon dioxide crude liquid; (4) The crude liquid of 10-keto stearic acid modified nano-silica is centrifuged and the obtained solid is dried to obtain the 10-keto stearic acid modified nano-silica.

8. The method for preparing the insulator protective agent according to claim 7, characterized in that: The mass volume ratio of the 10-keto stearic acid to the anhydrous ethanol is 1-5 g / 100 mL, and the mass volume ratio of the nano silicon dioxide to the anhydrous ethanol is 0.5-3 g / 40 mL.

9. The method for preparing the insulator protective agent according to claim 7, characterized in that: The mass ratio of the 10-keto stearic acid to the nano silicon dioxide is 0.15-0.25:

1.

10. The method for preparing the insulator protective agent according to claim 7, characterized in that: The insulation reaction temperature is 45-55°C.

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