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CN-122011931-A - Aging-resistant insulating paint and preparation method thereof

CN122011931ACN 122011931 ACN122011931 ACN 122011931ACN-122011931-A

Abstract

The invention relates to the technical field of coatings, in particular to an anti-aging insulating coating and a preparation method thereof, wherein the insulating coating comprises, by weight, 15-25 parts of hydroxyl-terminated polysiloxane, 2-5 parts of a diluent, 0.5-3 parts of a cross-linking agent, 30-35 parts of a filler, 0.01-0.03 part of a catalyst and 42-47 parts of a solvent. The insulating paint prepared by the invention has higher mechanical strength and also has the advantages of good ageing resistance and good insulativity.

Inventors

  • WANG LIANG
  • JIA XU

Assignees

  • 河北汉东电力设备有限公司

Dates

Publication Date
20260512
Application Date
20260324

Claims (10)

  1. 1. The aging-resistant insulating paint is characterized by comprising, by weight, 15-25 parts of hydroxyl-terminated polysiloxane, 2-5 parts of a diluent, 0.5-3 parts of a cross-linking agent, 30-35 parts of a filler, 0.01-0.03 part of a catalyst and 42-47 parts of a solvent.
  2. 2. The aging-resistant insulating paint according to claim 1, wherein the diluent is epoxy-modified silicone oil.
  3. 3. The aging-resistant insulating paint according to claim 1, wherein the crosslinking agent is methyltributylketonoxime silane.
  4. 4. The aging-resistant insulating paint according to claim 1, wherein the preparation method of the filler comprises the following steps (1) Adding titanate coupling agent, 3-aminopropyl trimethylsilane and titanium dioxide into ethanol, stirring for 1-2h at 35-45 ℃, filtering and drying to obtain pretreated titanium dioxide; (2) Adding 3- (2, 3-glycidoxy) propyl trimethoxy silane into ethanol for dissolution, then adding aluminum hydroxide, stirring for 1-2h, filtering, and drying to obtain pretreated aluminum hydroxide; (3) Under the protection of nitrogen, adding the pretreated titanium dioxide obtained in the step (1) and the pretreated aluminum hydroxide obtained in the step (2) into absolute ethyl alcohol, heating to 60-65 ℃, reacting for 45-55h, filtering, drying and grinding to obtain the filler.
  5. 5. The anti-aging insulating paint according to claim 4, wherein the mass ratio of the titanate coupling agent, 3-aminopropyl trimethylsilane and titanium dioxide in the step (1) is (0.05-0.07): 0.01-0.05): 1.
  6. 6. The anti-aging insulating paint according to claim 4, wherein the mass ratio of 3- (2, 3-glycidoxy) propyltrimethoxysilane to aluminum hydroxide in the step (2) is (0.01-0.04): 1.
  7. 7. The aging-resistant insulating paint according to claim 4, wherein the mass ratio of the pretreated titanium oxide to the pretreated aluminum hydroxide in the step (3) is 1 (2-3).
  8. 8. The aging-resistant insulating paint according to claim 1, wherein the catalyst is an organotin catalyst.
  9. 9. The aging-resistant insulating paint according to claim 1, wherein the solvent is tetrachloroethylene.
  10. 10. A method for preparing the anti-aging insulating paint as claimed in any one of claims 1 to 9, comprising the steps of: Stirring hydroxyl-terminated polysiloxane, a diluent and a filler for 1-2h at room temperature under the protection of inert gas, continuously adding a solvent, stirring for 20-30min, adding a cross-linking agent and a catalyst, and stirring for 5-10min to obtain the aging-resistant insulating coating.

Description

Aging-resistant insulating paint and preparation method thereof Technical Field The invention relates to the technical field of coatings, in particular to an anti-aging insulating coating and a preparation method thereof. Background The insulating paint is also called insulating paint, is a functional paint with excellent electrical insulation, belongs to dielectric materials, has the core function of isolating conductive parts with different electric potentials, ensures the safe and stable operation of electrical equipment, is named as a 'heart of a motor', and directly determines the economic and technical index and service life of the electrical equipment in terms of performance. Since 1907 phenolic resin trial production successfully marks the birth of an insulating material, the insulating coating is gradually developed from an early simple resin system into a plurality of base materials comprising epoxy resin, organic silicon resin, polyimide and the like, and is suitable for diversified products with different scene requirements, and the insulating coating is widely applied to the national economy core fields of power systems, new energy equipment, rail transit, electronic elements and the like. The patent CN104212345B discloses an insulating coating special for plasma equipment, which comprises, by mass, 25-40 parts of methyl vinyl silicone rubber, 5-15 parts of polyester modified silicone resin, 5-15 parts of nano attapulgite, 5-15 parts of mica powder, 15-30 parts of butanol, 10-15 parts of butyl acetate, 1-5 parts of a curing agent, 0.5-2 parts of a stabilizing agent and 0.1-0.5 part of a silane coupling agent. The invention not only has excellent insulating property, but also can meet the characteristics of pressure resistance, flame retardance, pollution flashover resistance, corrosion resistance, ozone resistance and the like required by plasma equipment. The patent CN115058192B discloses an arc-resistant insulating paint for an electric locomotive, which comprises, by mass, 100 parts of (5-10) a component A and a component B, wherein the component A comprises, by weight, 100 parts of hydroxyl-terminated polydimethylsiloxane, 30-100 parts of simethicone, 10-40 parts of white carbon black, 5-15 parts of diatomite, 20-40 parts of aluminum hydroxide, 3-5 parts of color paste, 100-300 parts of a mixed solvent, and the component B comprises, by weight, 1-10 parts of a cross-linking agent, 1-10 parts of a silane coupling agent, 1-5 parts of a catalyst and 20-50 parts of a mixed solvent. The arc-resistant insulating coating provided by the invention combines diatomite and a specific crosslinking system by adopting a mixed solvent, so that when the thickness of the arc-resistant insulating coating reaches 10mm while ensuring that each raw material in the coating is uniformly dispersed, the time of surface drying and deep curing is greatly shortened, and excellent mechanical strength and electrical performance are maintained. As described in the above patent, the present insulating paint optimizes the insulating performance, corrosion resistance and mechanical performance, however, the insulating paint is widely applied to various electrical devices such as generators, transformers, switch cabinets, power transmission and transformation lines, and is exposed to outdoor complex environments or high-temperature working conditions inside the devices for a long time, and the performance requirements on the insulating paint are increasingly severe, especially the ageing resistance, and therefore, the development of an ageing-resistant insulating paint is urgently needed in the market. Disclosure of Invention Aiming at the problems in the prior art, the invention aims to obtain the aging-resistant insulating paint which has high mechanical strength, good insulativity, high aging resistance and long service life. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The invention provides an aging-resistant insulating coating which comprises, by weight, 15-25 parts of hydroxyl-terminated polysiloxane, 2-5 parts of a diluent, 0.5-3 parts of a cross-linking agent, 30-35 parts of a filler, 0.01-0.03 part of a catalyst and 42-47 parts of a solvent. In some embodiments, the diluent is an epoxy modified silicone oil. In some embodiments, the crosslinker is methyltributylketonoxime silane. In some embodiments, the method of making the filler comprises the steps of (1) Adding titanate coupling agent, 3-aminopropyl trimethylsilane and titanium dioxide into ethanol, stirring for 1-2h at 35-45 ℃, filtering and drying to obtain pretreated titanium dioxide; (2) Adding 3- (2, 3-glycidoxy) propyl trimethoxy silane into ethanol for dissolution, then adding aluminum hydroxide, stirring for 1-2h at 35-40 ℃, filtering, and drying to obtain pretreated aluminum hydroxide; (3) Under the protection of nitrogen, adding the pretreated titanium dioxide obtained in the step (1) and the pret