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CN-120795661-B - High-temperature-resistant sealing coating and preparation method thereof

CN120795661BCN 120795661 BCN120795661 BCN 120795661BCN-120795661-B

Abstract

The invention relates to the technical field of coatings, and discloses a high-temperature-resistant sealing coating and a preparation method thereof. The high-temperature-resistant sealing coating comprises, by mass, 35-40 parts of corundum micropowder, 5-8 parts of flaky alumina, 3-6 parts of aluminum silicate fiber, 30-40 parts of silicate composite material and 2-4 parts of rare earth oxide, wherein the silicate composite material is a composition of composite silicate and organic silicon resin modified boron nitride. The preparation method of the organic silicon resin modified boron nitride comprises the steps of mixing toluene, water, phenyl trimethoxysilane, vinyl trimethoxysilane, zirconium acetylacetonate and ferric acetylacetonate, stirring for 1-2 hours, adjusting the pH to 4-5, continuing to react for 16-24 hours, aging for 5-6 hours, removing the solvent to obtain the modified organic silicon resin, uniformly mixing the modified organic silicon resin and the boron nitride modified by the methyl mercapto trimethoxysilane, adding a photoinitiator, stirring, and carrying out ultraviolet irradiation crosslinking to obtain the organic silicon resin modified boron nitride.

Inventors

  • ZHANG XIAOJING
  • NI HONGBING
  • JU SHAOHUA

Assignees

  • 靖江市耐佳电力设备制造有限公司

Dates

Publication Date
20260512
Application Date
20250530

Claims (7)

  1. 1. The high-temperature-resistant sealing coating is characterized by comprising, by mass, 35-40 parts of corundum micropowder, 5-8 parts of flaky alumina, 3-6 parts of aluminum silicate fiber, 30-40 parts of silicate composite material and 2-4 parts of rare earth oxide; The silicate composite material comprises composite silicate and organic silicon resin modified boron nitride in a mass ratio of (1-1.2); The preparation method of the organic silicon resin modified boron nitride comprises the following steps of S1, mixing toluene, water, phenyl trimethoxysilane, vinyl trimethoxysilane, zirconium acetylacetonate and ferric acetylacetonate, stirring for 1-2 hours, adjusting pH to 4-5, continuing to react for 16-24 hours, aging for 5-6 hours, removing a solvent to obtain modified organic silicon resin, S2, uniformly dispersing boron nitride in a mixed solution of water and ethanol, adding the methyl mercapto trimethoxysilane, heating to 60-70 ℃, stirring for 2-4 hours, removing the solvent to obtain modified boron nitride, S3, uniformly mixing the modified organic silicon resin and the modified boron nitride, adding a photoinitiator, and performing ultraviolet irradiation crosslinking under stirring to obtain the organic silicon resin modified boron nitride; The modified organic silicon resin comprises, by mass, 30-40 parts of toluene, 1-2 parts of water, 10-12 parts of phenyl trimethoxysilane, 3-5 parts of vinyl trimethoxysilane, 2.5-3.5 parts of zirconium acetylacetonate and 0.5-0.7 part of iron acetylacetonate.
  2. 2. The high-temperature-resistant sealing coating of claim 1, wherein the modified boron nitride comprises, by mass, 20-40 parts of boron nitride and 1-2 parts of methyltrimethoxysilane.
  3. 3. The high-temperature-resistant sealing coating of claim 1, wherein the organic silicon resin modified boron nitride comprises, by mass, 10-15 parts of modified organic silicon resin, 15-20 parts of modified boron nitride and 0.01-0.02wt% of photoinitiator based on the total mass of the modified organic silicon resin and the modified boron nitride.
  4. 4. The high-temperature-resistant sealing coating is characterized in that the preparation of the composite silicate comprises the following steps of uniformly mixing sodium silicate and potassium hydroxide, heating to 800-900 ℃, adding lithium silicate, preserving heat for 1-2 h, heating to 1150-1200 ℃, maintaining for 2-3 h, cooling to normal temperature, adding sodium borate, and uniformly stirring to obtain the composite silicate.
  5. 5. The high-temperature-resistant sealing coating of claim 4, wherein the composite silicate comprises, by mass, 8-10 parts of sodium silicate, 0.5-2 parts of potassium hydroxide, 3-6 parts of lithium silicate and 0.5-2 parts of sodium borate.
  6. 6. The high-temperature-resistant sealing coating of claim 1, wherein the rare earth oxide is Y 2 O 3 、La 2 O 3 with a mass ratio of (3-4) to 1.
  7. 7. The method for preparing the high-temperature-resistant sealing coating according to any one of claims 1-6, which is characterized by comprising the following steps of uniformly mixing flaky alumina, aluminum silicate fiber and silicate composite material, sintering at 1200-1300 ℃ for 0.5-1 h, adding corundum micro powder and rare earth oxide, uniformly mixing, and mixing at 900-1000 ℃ for 2-3 h to obtain the high-temperature-resistant sealing coating.

Description

High-temperature-resistant sealing coating and preparation method thereof Technical Field The invention relates to the technical field of coatings, and discloses a high-temperature-resistant sealing coating and a preparation method thereof. Background In the field of modern industry, high temperature resistant protective materials have been one of the technical hotspots being studied. The high-temperature-resistant sealing coating is a high-performance coating specially designed for protecting a substrate in a high-temperature environment, needs to have the performances of high temperature resistance, water resistance, moisture resistance, oxidation resistance, corrosion resistance, impact resistance and the like, can remarkably prolong the service life of the substrate, reduces the maintenance cost, ensures the production safety, and can be applied to various industrial scenes such as aerospace, metallurgy, chemical industry and the like. The existing high-temperature resistant paint comprises ceramic paint, silicate paint, organic resin paint and the like, and has certain high-temperature resistance, but has various defects such as limited temperature resistant range and incapability of meeting extreme high-temperature requirements, or obviously reduced mechanical property under high-temperature environment, so that the protective performance is reduced, and the protective requirements under various severe working conditions are difficult to meet, or the coating spraying and curing process is complex, complex matched process is required, the construction is inconvenient, and the like. Therefore, the research on the sealing coating with single coating, good high temperature resistance and stable mechanical property at high temperature and the preparation method thereof has important significance. Disclosure of Invention The invention aims to provide a high-temperature-resistant sealing coating and a preparation method thereof, which are used for solving the problems in the background technology. In order to solve the technical problems, the invention provides the technical scheme that the high-temperature-resistant sealing coating comprises, by mass, 35-40 parts of corundum micropowder, 5-8 parts of flaky alumina, 3-6 parts of aluminum silicate fiber, 30-40 parts of silicate composite material and 2-4 parts of rare earth oxide; the silicate composite material comprises composite silicate and organic silicon resin modified boron nitride in a mass ratio of 1 (1-1.2). S1, mixing toluene, water, phenyl trimethoxy silane, vinyl trimethoxy silane, zirconium acetylacetonate and ferric acetylacetonate, stirring for 1-2 h, adjusting pH to 4-5, continuing to react for 16-24 h, aging for 5-6 h, and removing a solvent to obtain modified organic silicon resin; S2, taking boron nitride, uniformly dispersing the boron nitride in a mixed solution of water and ethanol, adding methyl mercapto trimethoxy silane, heating to 60-70 ℃, stirring for 2-4 hours, and removing a solvent to obtain modified boron nitride; And S3, uniformly mixing the modified organic silicon resin and the modified boron nitride, adding a photoinitiator, and carrying out ultraviolet irradiation crosslinking under stirring to obtain the organic silicon resin modified boron nitride. More optimally, the modified organic silicon resin comprises the following raw materials, by mass, 30-40 parts of toluene, 1-2 parts of water, 10-12 parts of phenyl trimethoxysilane, 3-5 parts of vinyl trimethoxysilane, 2.5-3.5 parts of zirconium acetylacetonate and 0.5-0.7 part of ferric acetylacetonate. More optimally, the modified boron nitride comprises the following raw materials, by mass, 20-40 parts of boron nitride and 1-2 parts of methyl mercapto trimethoxy silane. More optimally, the organic silicon resin modified boron nitride comprises the following raw materials, by mass, 10-15 parts of modified organic silicon resin, 15-20 parts of modified boron nitride, and a photoinitiator accounting for 0.01-0.02 wt% of the total mass of the modified organic silicon resin and the modified boron nitride. More optimally, the preparation of the composite silicate comprises the following steps of uniformly mixing sodium silicate and potassium hydroxide, heating to 800-900 ℃, adding lithium silicate, preserving heat for 1-2 hours, heating to 1150-1200 ℃, maintaining for 2-3 hours, cooling to normal temperature, adding sodium borate, and uniformly stirring to obtain the composite silicate. More optimally, the composite silicate comprises the following raw materials, by mass, 8-10 parts of sodium silicate, 0.5-2 parts of potassium hydroxide, 3-6 parts of lithium silicate and 0.5-2 parts of sodium borate. More preferably, the rare earth oxide is Y 2O3、La2O3 with the mass ratio of (3-4) to 1. More preferably, the rare earth oxide is Y 2O3、La2O3 with a mass ratio of 3:1. More optimally, the preparation method of the high-temperature-resistant sealing coating comprises the following ste