Anti-pollution flashover coating composition and application thereof

Abstract

The invention discloses an anti-pollution flashover coating composition and application thereof, and relates to the technical field of coatings, and the anti-pollution flashover coating composition comprises the following components in parts by weight: 85-105 parts of base rubber, 10-20 parts of a filler, 1-3 parts of a cross-linking agent, 2-5 parts of a coupling agent, 0.5-1.5 parts of a catalyst and 140-175 parts of a solvent. A proper amount of polyisoprene containing a UPy unit at the tail end is introduced on the basis of existing hydroxyl-terminated polydimethylsiloxane-based rubber, and modified silicon dioxide obtained by treating aminated silicon dioxide through an imidazole ionic liquid containing 9-13 straight-chain alkyl carbons is used as a filler, so that the two components have a synergistic effect; the anti-pollution flashover capability of the anti-pollution flashover coating composition is improved, the thermal aging resistance of the coating in a high-temperature environment is remarkably improved, the service life of the coating is effectively prolonged, and thus more reliable safety guarantee is provided for anti-pollution flashover power equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to an anti-fouling flashover coating composition and application thereof. Background Art

[0002] In the field of power equipment, anti-pollution flashover coatings, especially RTV (room temperature vulcanized silicone rubber) coatings, as an important protective material, play a vital role in ensuring the safe and stable operation of power systems. Pollution flashover is one of the common faults in power systems and seriously threatens the safe operation of power grids. Therefore, the development of anti-pollution flashover coatings with excellent anti-pollution flashover performance and heat aging resistance has always been the focus of research.

[0003] Traditional RTV coatings have been widely used in anti-pollution flashover of power equipment due to their good water repellency, weather resistance and easy construction. However, with the continuous development of power systems and the increasingly complex operating environment, RTV coatings have also exposed some defects.

[0004] On the one hand, RTV coatings age quickly in high temperature environments. Power equipment generates a lot of heat during operation, which makes RTV coatings susceptible to high temperatures, causing aging, cracking, and shedding, thereby reducing their anti-fouling flashover performance. Rapid aging in high temperature environments requires frequent recoating and repair of RTV coatings, increasing maintenance costs and workload.

[0005] On the other hand, the recoating process of RTV coating is relatively cumbersome. When RTV coating ages, in order to restore its anti-fouling flashover performance, it is usually necessary to thoroughly remove the aged RTV coating and then recoat with new RTV coating. This process not only consumes a lot of manpower and time, but also has certain safety risks when recoating in a high temperature environment.

[0006] In addition, the traditional RTV coatings still need to be improved in terms of anti-fouling flashover capability and heat aging resistance. Although silicone resins such as hydroxy-terminated polydimethylsiloxane have been widely used as base glues in RTV coatings, their performance still has room for improvement. At the same time, traditional fillers such as silica, although they can enhance the mechanical properties and wear resistance of coatings, have limited improvement in anti-fouling flashover performance and are difficult to effectively deal with aging problems in high temperature environments.

[0007] Therefore, it is urgent to develop a new anti-fouling flash RTV coating composition to solve the above problems. Summary of the invention

[0008] In order to solve the above problems, the present invention provides an anti-fouling flashover coating composition and application thereof.

[0009] In a first aspect, the present invention provides an anti-pollution flashover coating composition, which comprises the following components in parts by weight:

[0010] 85-105 parts of base rubber, 10-20 parts of filler, 1-3 parts of cross-linking agent, 2-5 parts of coupling agent, 0.5-1.5 parts of catalyst and 140-175 parts of solvent;

[0011] The base glue is composed of terminal hydroxyl polydimethylsiloxane and terminal polyisoprene containing UPy units in a weight ratio of (90-100):(11-17);

[0012] The filler is obtained by treating amino silicon dioxide with an imidazole ionic liquid containing a straight-chain alkyl group with 9 to 13 carbon atoms.

[0013] Furthermore, the anti-fouling flashover coating composition comprises the following components in parts by weight:

[0014] 100 parts of base rubber, 17 parts of filler, 2 parts of cross-linking agent, 3.5 parts of coupling agent, 1 part of catalyst and 165 parts of solvent.

[0015] Furthermore, the weight ratio of the terminal hydroxyl polydimethylsiloxane to the terminal polyisoprene containing UPy units is 95:14.

[0016] Furthermore, the preparation method of the filler comprises the following process:

[0017] Obtaining the amino silicon dioxide;

[0018] The amino silicon dioxide and the imidazole ionic liquid ethanol solution with a molar concentration of 0.1 to 0.2 mol / L are stirred and mixed in a weight ratio of 1:(80 to 100), and then heated and stirred at a temperature of 40 to 50° C. for 10 to 16 hours to obtain a first mixture;

[0019] The first mixed material is filtered, and then the obtained solid is washed with ethanol and dried to obtain the filler.

[0020] Further, the cross-linking agent includes at least one of methyl tributylacetonato silane, vinyl tributylacetonato silane and methyl triacetone silane, the coupling agent includes at least one of 3-aminopropyl triethoxysilane, γ-glycidyloxypropyl trimethoxysilane and γ-methacryloxypropyl trimethoxysilane, the catalyst includes at least one of dibutyltin dilaurate and dibutyltin oxide, the solvent is composed of xylene and dichloromethane in a weight ratio of (1 to 2): (1 to 2), and the imidazole ionic liquid containing a linear alkyl group with a carbon number of 9 to 13 includes at least one of 1-octyl-3-methylimidazolium bromide, 1-decyl-3-methylimidazolium bromide and 1-dodecyl-3-methylimidazolium bromide.

[0021] Furthermore, the anti-fouling flashover coating composition further comprises the following components in parts by weight:

[0022] 3 parts of pigment, 0.2-0.5 parts of dispersant, 0.5-1.2 parts of leveling agent and 10-15 parts of flame retardant.

[0023] Further, the pigment includes at least one of carbon black and iron red, the dispersant includes BYK-163, the leveling agent includes at least one of methyl acrylate and ethyl acrylate, and the flame retardant includes at least one of aluminum hydroxide and magnesium hydroxide.

[0024] Furthermore, the preparation method of the anti-fouling flashover coating composition comprises the following steps:

[0025] The base rubber, the filler, the flame retardant and the pigment are stirred and mixed, and then vacuum stirred at a temperature of 100 to 120° C. for 1.5 to 2.5 hours to obtain a second mixture;

[0026] The second mixed material is cooled to room temperature and then ground. After the grinding fineness of the material is less than 20 μm, the remaining components in the anti-pollution flashover coating composition are added and stirred and mixed to obtain the anti-pollution flashover coating composition.

[0027] In the second aspect, based on the same inventive concept, the present invention provides an application of the anti-pollution flash coating composition described in any one of the first aspects in the preparation of anti-pollution lightning force equipment, and the surface of the anti-pollution lightning force equipment is provided with a coating formed by the anti-pollution flash coating composition described in any one of the first aspects.

[0028] Furthermore, the static water contact angle of the coating after accelerated thermal aging at 200° C. for 10 days is greater than 120°.

[0029] The above technical solution provided by the embodiment of the present invention has at least the following advantages compared with the prior art:

[0030] The embodiment of the present invention provides an anti-pollution flashover coating composition and its application. The present invention introduces an appropriate amount of polyisoprene containing UPy units at the end on the basis of the existing terminal hydroxyl polydimethylsiloxane gum, and uses modified silica obtained by treating amino silica with an imidazole ionic liquid containing a straight-chain alkyl carbon number of 9 to 13 as a filler. The two synergistically enhance the anti-pollution flashover capability of the obtained anti-pollution flashover coating composition, and significantly improve the heat aging resistance of the coating in a high temperature environment, effectively extending the service life of the coating, thereby providing a more reliable safety guarantee for anti-pollution flashover equipment. Specifically:

[0031] 1. Composition and characteristics of base rubber:

[0032] The base glue of the present invention is composed of an appropriate proportion of terminal hydroxyl polydimethylsiloxane (PDMS) and polyisoprene (PI-UPy) containing UPy units at the end. Among them, PDMS is a polymer material with excellent hydrophobicity and heat resistance, widely used in anti-fouling flashover coatings, and its terminal hydroxyl groups provide active sites for crosslinking; PI-UPy is a polymer with a special chemical structure, and the UPy unit (uracil-2,4-dione) has a unique quadruple hydrogen bond interaction. When the polyisoprene containing UPy units at the end is introduced into the base glue system, the UPy units can form a reversible crosslinked network structure through quadruple hydrogen bonds. This characteristic gives the coating the ability to self-repair and reshape. At the same time, the introduction of polyisoprene also changes the microscopic morphology of the base glue, making it have better flexibility and elasticity, complementing the rigid structure of the terminal hydroxyl polydimethylsiloxane, and optimizing the overall performance of the base glue. This synergistic effect helps to improve the adhesion and toughness of the coating, so that it can better maintain its integrity under different environmental conditions.

[0033] Therefore, PDMS provides a good hydrophobic and heat-resistant foundation, and the introduction of PI-UPy forms a reversible covalent bond with PDMS or other components through its terminal UPy unit, which enhances the cohesion and self-healing ability of the coating. This synergistic effect enables the coating to maintain stability and extend its service life when exposed to external factors in a high-temperature environment.

[0034] 2. Modification and function of fillers:

[0035] The filler in the present invention is modified silica (Mod-SiO2) obtained by treating amination silica (SiO2-NH2) with an imidazole ionic liquid containing a straight-chain alkyl group with a carbon number of 9 to 13. The amino groups on the surface of amination silica have strong reactivity, and can react chemically with the imidazole ionic liquid and interact through hydrogen bonds, etc., to achieve the introduction of imidazole ionic liquids containing specific alkyl long chains. The introduction of imidazole ionic liquids containing a straight-chain alkyl group with a carbon number of 9 to 13 can not only enhance the hydrophobicity of the coating, but also form a microscopic ordered structure in the coating, improve the surface properties and internal structure of the coating, thereby further improving the anti-fouling flash and heat aging resistance of the coating. Moreover, the modified silica can form a strong interaction with the terminal hydroxyl polydimethylsiloxane in the base glue and the polyisoprene containing UPy units at the end, such as hydrogen bonds, van der Waals forces, etc., which can not only improve the interfacial compatibility between silica and the base glue, but also enhance the dispersibility of the filler in the base glue and improve the comprehensive performance of the coating.

[0036] In summary, the present invention introduces an appropriate amount of polyisoprene containing UPy units at the end on the basis of the existing hydroxy-terminated polydimethylsiloxane-based adhesive, and at the same time cooperates with a specially modified silica filler. The dynamic cross-linked network structure of the UPy units in the base adhesive can maintain a certain stability at high temperatures and give it self-repairing ability. At the same time, the modified silica filler plays a role in strengthening the skeleton in the coating, further improving the stability and hydrophobicity of the coating. The synergistic effect of the two realizes the simultaneous improvement of the anti-fouling flashover ability and heat aging resistance of the anti-fouling flashover coating composition, providing a more reliable safety guarantee for anti-fouling flashover equipment. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0039] In a first aspect, the present invention provides an anti-pollution flashover coating composition, which comprises the following components in parts by weight:

[0040] 85-105 parts of base rubber, 10-20 parts of filler, 1-3 parts of cross-linking agent, 2-5 parts of coupling agent, 0.5-1.5 parts of catalyst and 140-175 parts of solvent;

[0041] The base glue is composed of terminal hydroxyl polydimethylsiloxane and terminal polyisoprene containing UPy units in a weight ratio of (90-100):(11-17);

[0042] The filler is obtained by treating amino silicon dioxide with an imidazole ionic liquid containing a straight-chain alkyl group with 9 to 13 carbon atoms.

[0043] An embodiment of the present invention provides an anti-pollution flashover coating composition. The present invention introduces an appropriate amount of polyisoprene containing UPy units at the end on the basis of an existing terminal hydroxyl polydimethylsiloxane adhesive, and uses modified silica obtained by treating amino silica with an imidazole ionic liquid containing a straight-chain alkyl carbon number of 9 to 13 as a filler. The synergistic effect of the two not only improves the anti-pollution flashover ability of the obtained anti-pollution flashover coating composition, but also significantly improves the heat aging resistance of the coating in a high temperature environment, effectively prolonging the service life of the coating, thereby providing a more reliable safety guarantee for anti-pollution flashover equipment.

[0044] The terminal hydroxyl polydimethylsiloxane in the present invention can be directly used as commercially available products such as 107 silicone rubber with a viscosity of 4000 mPa·s sold by Shandong Luderui New Materials Co., Ltd. and other companies.

[0045] The polyisoprene containing the UPy unit at the end of the present invention can be directly prepared according to the preparation process disclosed in the prior art CN104194353A, specifically using the method described in Example 1, which specifically includes the following process:

[0046] Degas a dry four-necked flask, inject 30 mL of isoprene and 10 mL of sec-butyl lithium, react in a water bath at 30°C for 3 hours, then inject 20 mL of propylene oxide into the flask, react at 30°C for 6 hours, finally inject 10 mL of degassed methanol to terminate the reaction, then pour the reaction solution into 10 mL of isopropanol for precipitation, and obtain a white viscous substance, namely: hydroxy-terminated polyisoprene;

[0047] 20 g of HDI was added to a four-necked flask, followed by 20 g of hydroxy-terminated polyisoprene. The mixture was stirred at room temperature under nitrogen for 3 hours to obtain a milky white viscous substance, i.e., polyisoprene containing NCO at the end.

[0048] 30 g of polyisoprene containing NCO at the end and 10 g of 6-methylisocytosine were added to a four-necked flask. The mixture was stirred at room temperature under N2 for 30 minutes, then heated to 50°C and maintained for 5 hours to obtain a white viscous substance, i.e., polyisoprene containing UPy units at the end.

[0049] The amination silicon dioxide in the present invention can be directly obtained from commercial products or prepared in-house according to the preparation process disclosed in the prior art, and is specifically prepared by the following method:

[0050] Nano-silica was dispersed in N,N-dimethylformamide at a concentration ratio of 1 mg / mL, and 3-aminopropyltriethoxysilane was added at a ratio of 2 μL 3-aminopropyltriethoxysilane per 1 mg of nano-silica. After stirring at room temperature for 24 hours, the mixture was washed with water and ethanol respectively, and centrifuged and repeated three times, and dried to obtain the amino-silica.

[0051] In some specific embodiments, the anti-fouling flashover coating composition comprises the following components in parts by weight:

[0052] 100 parts of base rubber, 17 parts of filler, 2 parts of cross-linking agent, 3.5 parts of coupling agent, 1 part of catalyst and 165 parts of solvent.

[0053] In some specific embodiments, the weight ratio of the terminal hydroxyl polydimethylsiloxane to the terminal polyisoprene containing UPy units is 95:14.

[0054] In some specific embodiments, the method for preparing the filler comprises the following process:

[0055] Obtaining the amino silicon dioxide;

[0056] The amino silicon dioxide and the imidazole ionic liquid ethanol solution with a molar concentration of 0.1 to 0.2 mol / L are stirred and mixed in a weight ratio of 1:(80 to 100), and then heated and stirred at a temperature of 40 to 50° C. for 10 to 16 hours to obtain a first mixture;

[0057] The first mixed material is filtered, and then the obtained solid is washed with ethanol and dried to obtain the filler.

[0058] In some specific embodiments, the cross-linking agent includes at least one of methyl tributylacetonato silane, vinyl tributylacetonato silane and methyl triacetone silane, the coupling agent includes at least one of 3-aminopropyl triethoxysilane, γ-glycidyloxypropyl trimethoxysilane and γ-methacryloxypropyl trimethoxysilane, the catalyst includes at least one of dibutyltin dilaurate and dibutyltin oxide, the solvent is composed of xylene and dichloromethane in a weight ratio of (1 to 2): (1 to 2), and the imidazole ionic liquid containing a linear alkyl group with a carbon number of 9 to 13 includes at least one of 1-octyl-3-methylimidazolium bromide, 1-decyl-3-methylimidazolium bromide and 1-dodecyl-3-methylimidazolium bromide.

[0059] In some specific embodiments, the anti-fouling flashover coating composition further comprises the following components in parts by weight:

[0060] 3 parts of pigment, 0.2-0.5 parts of dispersant, 0.5-1.2 parts of leveling agent and 10-15 parts of flame retardant.

[0061] In some specific embodiments, the pigment includes at least one of carbon black and iron red, the dispersant includes BYK-163, the leveling agent includes at least one of methyl acrylate and ethyl acrylate, and the flame retardant includes at least one of aluminum hydroxide and magnesium hydroxide.

[0062] In some specific embodiments, the method for preparing the anti-fouling flashover coating composition comprises the following steps:

[0063] The base rubber, the filler, the flame retardant and the pigment are stirred and mixed, and then vacuum stirred at a temperature of 100 to 120° C. for 1.5 to 2.5 hours to obtain a second mixture;

[0064] The second mixed material is cooled to room temperature and then ground. After the grinding fineness of the material is less than 20 μm, the remaining components in the anti-pollution flashover coating composition are added and stirred and mixed to obtain the anti-pollution flashover coating composition.

[0065] In the second aspect, based on the same inventive concept, the present invention provides an application of the anti-pollution flash coating composition described in any one of the first aspects in the preparation of anti-pollution lightning force equipment, and the surface of the anti-pollution lightning force equipment is provided with a coating formed by the anti-pollution flash coating composition described in any one of the first aspects.

[0066] In some specific embodiments, the static water contact angle of the coating after accelerated thermal aging at 200° C. for 10 days is greater than 120°.

[0067] It should be noted that the components and raw materials involved in the application of the anti-fouling flash coating composition and its application provided by the embodiments of the present invention, unless otherwise specified or specified, can be directly commercially available products or homemade using existing public preparation methods; at the same time, the steps and parameters involved, unless otherwise specified or specified, can be carried out according to the preparation process disclosed in the prior art or directly using existing equipment with reference to the instructions for use, and the present invention document will not repeat them one by one.

[0068] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0069] The preparation method of polyisoprene containing UPy units at the end in the following examples and comparative examples includes the following process:

[0070] Degas a dry four-necked flask, inject 30 mL of isoprene and 10 mL of sec-butyl lithium, react in a water bath at 30°C for 3 hours, then inject 20 mL of propylene oxide into the flask, react at 30°C for 6 hours, finally inject 10 mL of degassed methanol to terminate the reaction, then pour the reaction solution into 10 mL of isopropanol for precipitation, and obtain a white viscous substance, namely: hydroxy-terminated polyisoprene;

[0071] 20 g of HDI was added to a four-necked flask, followed by 20 g of hydroxy-terminated polyisoprene. The mixture was stirred at room temperature under nitrogen for 3 hours to obtain a milky white viscous substance, i.e., polyisoprene containing NCO at the end.

[0072] 30 g of polyisoprene containing NCO at the end and 10 g of 6-methylisocytosine were added to a four-necked flask. The mixture was stirred at room temperature under N2 for 30 minutes, then heated to 50°C and maintained for 5 hours to obtain a white viscous substance, i.e., polyisoprene containing UPy units at the end.

[0073] The preparation method of the amino silicon dioxide in the following examples and comparative examples comprises the following steps:

[0074] Nano-silica was dispersed in N,N-dimethylformamide at a concentration ratio of 1 mg / mL, and 3-aminopropyltriethoxysilane was added at a ratio of 2 μL 3-aminopropyltriethoxysilane per 1 mg of nano-silica. After stirring at room temperature for 24 hours, the mixture was washed with water and ethanol respectively, and centrifuged and repeated three times, and dried to obtain the amino-silica.

[0075] Example 1

[0076] This example provides an anti-pollution flashover coating composition, which includes the following components in parts by weight:

[0077] 100 parts of base rubber, 17 parts of filler, 2 parts of crosslinking agent, 3.5 parts of coupling agent, 1 part of catalyst, 165 parts of solvent, 2 parts of pigment, 0.3 parts of dispersant, 0.8 parts of leveling agent and 12 parts of flame retardant;

[0078] The base glue is composed of terminal hydroxyl polydimethylsiloxane and polyisoprene containing UPy units at the end in a weight ratio of 95:14, and the terminal hydroxyl polydimethylsiloxane is 107 silicone rubber;

[0079] The filler is obtained by treating aminated silicon dioxide with an imidazole ionic liquid (specifically 1-decyl-3-methylimidazolium bromide) containing a straight-chain alkyl group with carbon numbers of 9 to 13. The preparation method comprises the following steps: stirring and mixing the aminated silicon dioxide and an imidazole ionic liquid ethanol solution with a molar concentration of 0.15 mol / L at a weight ratio of 1:90, and then continuing to heat and stir at a temperature of 45° C. for 12 hours to obtain a first mixed material; filtering the first mixed material, and then washing the obtained solid with ethanol and drying to obtain the filler;

[0080] The crosslinking agent is methyl tributylidene oxime silane, the coupling agent is 3-aminopropyl triethoxysilane, the catalyst is dibutyl tin dilaurate, the solvent is composed of xylene and dichloromethane in a weight ratio of 1:2, the pigment is iron red, the dispersant is BYK-163, the leveling agent is methyl acrylate, and the flame retardant is aluminum hydroxide.

[0081] The preparation method of the anti-fouling flashover coating composition comprises the following steps:

[0082] The base rubber, the filler, the flame retardant and the pigment are stirred and mixed, and then vacuum stirred at 110° C. for 2 hours to obtain a second mixture;

[0083] The second mixed material is cooled to room temperature and then ground. After the grinding fineness of the material is less than 20 μm, the remaining components in the anti-pollution flashover coating composition are added and stirred and mixed to obtain the anti-pollution flashover coating composition.

[0084] Example 2

[0085] This example provides an anti-pollution flashover coating composition, which includes the following components in parts by weight:

[0086] 85 parts of base rubber, 10 parts of filler, 1 part of cross-linking agent, 2 parts of coupling agent, 0.5 parts of catalyst, 140 parts of solvent, 1 part of pigment, 0.2 parts of dispersant, 0.5 parts of leveling agent and 10 parts of flame retardant;

[0087] The base glue is composed of terminal hydroxyl polydimethylsiloxane and polyisoprene containing UPy units at the end in a weight ratio of 90:11, and the terminal hydroxyl polydimethylsiloxane is 107 silicone rubber;

[0088] The filler is obtained by treating aminated silicon dioxide with an imidazole ionic liquid (specifically 1-octyl-3-methylimidazolium bromide) containing a straight-chain alkyl group with carbon numbers of 9 to 13. The preparation method comprises the following steps: stirring and mixing the aminated silicon dioxide and an imidazole ionic liquid ethanol solution with a molar concentration of 0.1 mol / L at a weight ratio of 1:100, and then continuing to heat and stir at a temperature of 40° C. for 16 hours to obtain a first mixed material; filtering the first mixed material, and then washing the obtained solid with ethanol and drying to obtain the filler;

[0089] The crosslinking agent is vinyl trisbutyl ketoxime silane, the coupling agent is γ-glycidyloxypropyl trimethoxysilane, the catalyst is dibutyl tin oxide, the solvent is composed of xylene and dichloromethane in a weight ratio of 1:2, the pigment is carbon black, the dispersant is BYK-163, the leveling agent is ethyl acrylate, and the flame retardant is magnesium hydroxide.

[0090] The preparation method of the above anti-fouling flashover coating composition is the same as that of Example 1.

[0091] Example 3

[0092] This example provides an anti-pollution flashover coating composition, which includes the following components in parts by weight:

[0093] 105 parts of base rubber, 20 parts of filler, 3 parts of crosslinking agent, 5 parts of coupling agent, 1.5 parts of catalyst, 175 parts of solvent, 3 parts of pigment, 0.5 parts of dispersant, 1.2 parts of leveling agent and 15 parts of flame retardant;

[0094] The base glue is composed of terminal hydroxyl polydimethylsiloxane and polyisoprene containing UPy units at the end in a weight ratio of 100:17, and the terminal hydroxyl polydimethylsiloxane is 107 silicone rubber;

[0095] The filler is obtained by treating aminated silicon dioxide with an imidazole ionic liquid (specifically 1-dodecyl-3-methylimidazolium bromide) containing a straight-chain alkyl group with carbon numbers of 9 to 13. The preparation method comprises the following steps: stirring and mixing the aminated silicon dioxide and an imidazole ionic liquid ethanol solution with a molar concentration of 0.2 mol / L at a weight ratio of 1:80, and then continuing to heat and stir at a temperature of 50° C. for 10 hours to obtain a first mixed material; filtering the first mixed material, and then washing the obtained solid with ethanol and drying to obtain the filler;

[0096] The crosslinking agent is vinyl trisbutyl ketoxime silane, the coupling agent is γ-glycidyloxypropyl trimethoxysilane, the catalyst is dibutyl tin oxide, the solvent is composed of xylene and dichloromethane in a weight ratio of 1:2, the pigment is carbon black, the dispersant is BYK-163, the leveling agent is ethyl acrylate, and the flame retardant is magnesium hydroxide.

[0097] The preparation method of the above anti-fouling flashover coating composition is the same as that of Example 1.

[0098] Comparative Example 1

[0099] This example provides an anti-fouling flashover coating composition and a preparation method thereof, which differs from Example 1 only in that the polyisoprene containing a UPy unit at the end is adjusted to a commercially available polyisoprene liquid rubber (CAS No. 9003-31-0); the remaining steps and parameters are the same.

[0100] Comparative Example 2

[0101] This example provides an anti-fouling flash coating composition and a preparation method thereof, which is different from Example 1 only in that 1-decyl-3-methylimidazolium bromide is adjusted to 1-ethyl-3-methylimidazolium bromide; the remaining steps and parameters are the same.

[0102] Comparative Example 3

[0103] This example provides an anti-fouling flashover coating composition and a preparation method thereof, which differs from Example 1 only in that the weight ratio of terminal hydroxyl polydimethylsiloxane and terminal polyisoprene containing UPy units is adjusted to 95:39; the remaining steps and parameters are the same.

[0104] Test Case

[0105] In this example, the anti-pollution flashover coating composition obtained from the above-mentioned Examples 1 to 3 and Comparative Examples 1 to 3 is coated on a high-temperature resistant epoxy resin board to prepare a 50mm×50mm×2mm (length×width×thickness) test sample to examine its anti-pollution flashover performance and heat aging resistance in a high-temperature environment.

[0106] Test method: 1) Pre-treat the test samples in accordance with DL / T810-2002 "Technical Conditions for ±500kV DC Rod-Shaped Suspension Composite Insulators" for use; 2) Before the heat aging test, the pre-treated test samples are subjected to a contact angle meter to measure the static water contact angle θ1 of the coating surface to water: the test method is the drop method, that is, drop the droplet onto a glass slide through a syringe needle, and use the tangent method to read the contact angle, measure no less than 5 positions respectively, and take the average value; 3) After the pre-treated test samples are subjected to accelerated heat aging at 200°C for 10 days, the static water contact angle θ2 of the coating surface to water is measured using the same test method in 2).

[0107] The test results are shown in Table 1.

[0108] Table 1

[0109]

[0110] It can be seen from Table 1 that when the component system (such as Comparative Example 1 and Comparative Example 2) and the component dosage relationship (such as Comparative Example 3) in the anti-pollution flashover coating composition provided by the present invention are adjusted, the anti-pollution flashover ability and heat aging resistance of the anti-pollution flashover coating composition obtained in the embodiments of the present invention are reduced to varying degrees, especially the degree of reduction in heat aging resistance under high temperature environment is more significant.

[0111] In summary, the embodiments of the present invention provide an anti-pollution flashover coating composition and its application. The present invention introduces an appropriate amount of polyisoprene containing UPy units at the end on the basis of the existing terminal hydroxyl polydimethylsiloxane glue, and uses modified silica obtained by treating amino silica with an imidazole ionic liquid containing a straight-chain alkyl carbon number of 9 to 13 as a filler. The synergistic effect of the two not only improves the anti-pollution flashover ability of the obtained anti-pollution flashover coating composition, but also significantly improves the heat aging resistance of the coating in a high temperature environment, effectively prolonging the service life of the coating, thereby providing a more reliable safety guarantee for anti-pollution flashover equipment.

[0112] Various embodiments of the present invention may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present invention; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0113] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An anti-fouling flashover coating composition, characterized in that: The anti-fouling flashover coating composition comprises the following components in parts by weight: 85-105 parts of base rubber, 10-20 parts of filler, 1-3 parts of cross-linking agent, 2-5 parts of coupling agent, 0.5-1.5 parts of catalyst and 140-175 parts of solvent; The base glue is composed of terminal hydroxyl polydimethylsiloxane and terminal polyisoprene containing UPy units in a weight ratio of (90-100):(11-17); The filler is obtained by treating amino silicon dioxide with an imidazole ionic liquid containing a straight-chain alkyl group with 9 to 13 carbon atoms.

2. The anti-fouling flashover coating composition according to claim 1, characterized in that: The anti-fouling flashover coating composition comprises the following components in parts by weight: 100 parts of base rubber, 17 parts of filler, 2 parts of cross-linking agent, 3.5 parts of coupling agent, 1 part of catalyst and 165 parts of solvent.

3. The anti-fouling flashover coating composition according to claim 1, characterized in that: The weight ratio of the terminal hydroxyl polydimethylsiloxane to the terminal polyisoprene containing UPy units is 95:

14.

4. The anti-fouling flashover coating composition according to claim 1, characterized in that: Preparation method of the filler The process includes: Obtaining the amino silicon dioxide; The amino silicon dioxide and the imidazole ionic liquid ethanol solution with a molar concentration of 0.1 to 0.2 mol / L are stirred and mixed in a weight ratio of 1:(80 to 100), and then heated and stirred at a temperature of 40 to 50° C. for 10 to 16 hours to obtain a first mixture; The first mixed material is filtered, and then the obtained solid is washed with ethanol and dried to obtain the filler.

5. The anti-fouling flashover coating composition according to claim 1, characterized in that: The cross-linking agent includes at least one of methyl tributylacetonato silane, vinyl tributylacetonato silane and methyl triacetone silane, the coupling agent includes at least one of 3-aminopropyl triethoxysilane, γ-glycidyloxypropyl trimethoxysilane and γ-methacryloxypropyl trimethoxysilane, the catalyst includes at least one of dibutyltin dilaurate and dibutyltin oxide, the solvent is composed of xylene and dichloromethane in a weight ratio of (1 to 2): (1 to 2), and the imidazole ionic liquid containing a linear alkyl group with a carbon number of 9 to 13 includes at least one of 1-octyl-3-methylimidazolium bromide, 1-decyl-3-methylimidazolium bromide and 1-dodecyl-3-methylimidazolium bromide.

6. The anti-fouling flashover coating composition according to any one of claims 1 to 5, characterized in that: The anti-fouling flashover coating composition further comprises the following components in parts by weight: 3 parts of pigment, 0.2-0.5 parts of dispersant, 0.5-1.2 parts of leveling agent and 10-15 parts of flame retardant.

7. The anti-fouling flashover coating composition according to claim 6, characterized in that: The pigment includes at least one of carbon black and iron red, the dispersant includes BYK-163, the leveling agent includes at least one of methyl acrylate and ethyl acrylate, and the flame retardant includes at least one of aluminum hydroxide and magnesium hydroxide.

8. The anti-fouling flashover coating composition according to claim 7, characterized in that: The preparation method of the anti-pollution flashover coating composition comprises the following steps: The base rubber, the filler, the flame retardant and the pigment are stirred and mixed, and then vacuum stirred at a temperature of 100 to 120° C. for 1.5 to 2.5 hours to obtain a second mixture; The second mixed material is cooled to room temperature and then ground. After the grinding fineness of the material is less than 20 μm, the remaining components in the anti-pollution flashover coating composition are added and stirred and mixed to obtain the anti-pollution flashover coating composition.

9. Use of the anti-fouling flash coating composition according to any one of claims 1 to 8 in the preparation of anti-fouling flash equipment, characterized in that: The surface of the anti-fouling lightning force equipment is provided with a coating formed by the anti-fouling flash coating composition described in any one of claims 1 to 8.

10. The use according to claim 9, characterized in that: The static water contact angle of the coating after accelerated thermal aging at 200° C. for 10 days is greater than 120°.

Images