CN-121975429-A - Aluminum-containing high-temperature-resistant coating and preparation method thereof

Abstract

The invention discloses a preparation method of an aluminum-containing high-temperature-resistant coating, which comprises a component A and a component B, wherein the component A is prepared by mixing methyl phenyl organic silicon resin, an organic solvent, a toughening agent, a leveling agent, an anti-settling agent, double-layer coated aluminum powder, modified carbon nano tubes and the like, and the component B is prepared by mixing polysilazane and 1-hydroxyethyl-3-methylimidazole p-toluenesulfonate. The coating obtained by the invention has low curing temperature and excellent corrosion resistance and high temperature resistance.

Inventors

• SHAO CHANGYOU
• FENG LIXIN
• BI XINGHUA
• YING FENG
• WEI XIAOXIN

Assignees

• 江苏麟龙新材料股份有限公司

Dates

Publication Date

20260505

Application Date

20260227

Claims (10)

1. 1. The preparation method of the aluminum-containing high-temperature-resistant coating is characterized by comprising the following specific steps: (1) Coating graphene on the surface of nano aluminum powder to obtain a layer of coated aluminum powder, and then coating the layer of coated aluminum powder with silane to obtain double-layer coated aluminum powder; (2) Preparing a modified carbon nano tube, namely preparing a zirconia coated carbon nano tube by taking zirconium oxychloride and the carbon nano tube as raw materials; (3) According to parts by weight, mixing 20-30 parts of methylphenyl organic silicon resin, 8-10 parts of organic solvent, 0.1-0.3 part of toughening agent, 0.2-0.3 part of flatting agent and 0.1-0.3 part of anti-settling agent uniformly, adding 3-4 parts of double-layer coated aluminum powder and 1-2 parts of modified carbon nano tube while stirring, stirring uniformly to obtain a component A, and mixing 2-3 parts of polysilazane and 0.3-0.4 part of 1-hydroxyethyl-3-methylimidazole p-toluenesulfonate uniformly to obtain a component B.
2. 2. The preparation method of the coated aluminum powder according to claim 1, wherein in the step (1), graphite is used as an electrode, platinum is used as a counter electrode, the electrode and the counter electrode are inserted into an electrolyte solution, voltage is applied to electrolyze, the electrolyte solution is filtered and washed to obtain expanded graphite powder, then the expanded graphite powder is dispersed in N, N-dimethylformamide by ultrasonic, standing is carried out for 10-12 hours, bottom sediment (unpeeled graphite powder) is removed, supernatant fluid is collected, nanometer aluminum powder is added into the supernatant fluid, ultrasonic oscillation treatment is carried out, standing is carried out for 2-3 hours, and the obtained product is centrifugally taken out, washed, dried and heat treated to obtain the coated aluminum powder.
3. 3. The preparation method of the aluminum alloy powder is characterized in that in the step (1), silane and a layer of aluminum powder coated by the aluminum alloy powder are added into ethanol water solution, heated to reflux, kept at a temperature for 8-12 hours, centrifugally taken out, deposited and washed by absolute ethanol to obtain the aluminum alloy powder.
4. 4. The preparation method of the zirconia-coated carbon nano tube according to claim 1, wherein in the step (2), the zirconia-coated carbon nano tube is prepared by dissolving zirconia chloride in absolute ethyl alcohol to obtain a zirconia chloride solution, then dispersing the carbon nano tube in absolute ethyl alcohol to obtain a carbon nano tube dispersion liquid in an ultrasonic manner, mixing and stirring the zirconia chloride solution and the carbon nano tube dispersion liquid uniformly, then adding glycerol, stirring and mixing uniformly, adjusting the pH value to be 10-12, heating, filtering, vacuum drying and roasting to obtain the zirconia-coated carbon nano tube.
5. 5. The method according to claim 4, wherein the concentration of the zirconium oxychloride solution is 0.1-0.12 mol/L, the mass concentration of the carbon nanotube dispersion is 0.4-0.5%, the mass ratio of zirconium oxychloride to carbon nanotube to glycerol is 3-4:6-7:20-25, and the pH is adjusted by using 1mol/L sodium hydroxide solution.
6. 6. The method according to claim 4, wherein the heating treatment is carried out at 180-200 ℃ for 15-18 hours, the vacuum drying is carried out at 70-80 ℃ for 20-24 hours, and the baking is carried out at 350-400 ℃ for 2-3 hours.
7. 7. The preparation method of the nano-tube coating material according to claim 1, wherein in the step (2), the surface modification treatment method comprises the steps of adding silane and zirconia coated carbon nano-tubes into ethanol water solution, heating to reflux, preserving heat and refluxing for 8-12 hours, centrifuging, taking precipitate, and washing with absolute ethanol to obtain the nano-tube coating material.
8. 8. The method according to claim 1, wherein in the step (3), the organic solvent is selected from any one or more of xylene, cyclohexanone, n-butanol and butyl acetate.
9. 9. An aluminum-containing high temperature resistant coating, characterized by being obtained by the preparation method of any one of claims 1 to 8.
10. 10. The use of an aluminum-containing high temperature resistant coating as claimed in claim 9 for the corrosion protection of metal substrates.

Description

Aluminum-containing high-temperature-resistant coating and preparation method thereof Technical Field The invention relates to an aluminum-containing high-temperature-resistant coating and a preparation method thereof. Belongs to the technical field of paint preparation. Background The metal substrate has wide application in industries such as metallurgy, petrochemical industry and the like and automobile parts, and is mainly used for enhancing structures, improving performances and the like. However, the industries often have severe working environments, the metal substrate can be corroded, the performance is deteriorated until the metal substrate disappears, and the potential safety hazard is large. The simplest treatment method is to apply a coating on the surface of a metal substrate to form a coating layer, thereby playing a role in protection. Many metal substrates need to be in a high-temperature environment for a long time, the high-temperature resistance of the common coating is poor, thermal degradation and carbonization are easy to occur, and the protective performance of the coating also disappears. Therefore, it is highly necessary to develop a high temperature resistant coating suitable for metal substrates. The high-temperature resistant paint is various, and can be roughly divided into an inorganic high-temperature resistant paint and an organic high-temperature resistant paint, wherein the inorganic high-temperature resistant paint mainly comprises inorganic components and has the advantages of environmental protection, low cost, long service life and the like, and the organic high-temperature resistant paint mainly comprises epoxy resin paint, phenolic resin paint, polyurethane paint and the like and has the advantages of convenience in construction, good protection and the like. Among them, the silicone coating is the most common high temperature resistant coating, which contains a silicon-carbon bond structure in its molecule, and combines the characteristics of organics and inorganics, but the silicone coating generally requires high temperature curing, which causes inconvenience for large-area construction and poor adhesion. In a high temperature environment, aluminum has a penetrating and anchoring effect on a metal substrate and forms a certain amount of metal bonds, and the bonding firmness of the metal bonds is far greater than that of intermolecular van der Waals forces. The existence of aluminum can enable the thermal expansion performance of the coating to be close to that of the metal substrate, and good adhesion between the coating and the metal substrate is ensured. Therefore, the addition of aluminum powder to the coating contributes to the improvement of the high temperature resistance and adhesion of the coating. However, aluminum powder has poor dispersibility and poor stability in a coating system, and the improvement of the coating performance is limited. Patent CN108047934B discloses a high-temperature-resistant anticorrosive paint for steel structures, which is prepared by mixing inorganic resin, temperature-resistant filler, aluminum silicate fiber, zinc powder, aluminum powder, hollow microbeads and the like as raw materials. The technology adopts moisture curing inorganic resin, aluminum powder and zinc powder and is combined with hollow microspheres, wherein the zinc powder adopts spherical aluminum powder and flaky zinc powder to be combined to improve the corrosion resistance, aluminum silicate fiber is utilized to improve the cracking resistance of the coating at high temperature, spherical aluminum powder is combined with hollow microspheres, and the structural characteristics of the hollow microspheres are utilized to improve the temperature resistance of the coating. However, in the technology, aluminum powder and zinc powder are directly added into a coating system, the chemical property of the aluminum powder is active, spherical aluminum powder is easy to agglomerate, the dispersibility in the system is poor, and the coating performance is difficult to ensure. Disclosure of Invention The invention aims to overcome the defects in the prior art and provide an aluminum-containing high-temperature-resistant coating and a preparation method thereof. In order to achieve the above purpose, the present invention adopts the following technical scheme: the preparation method of the aluminum-containing high-temperature-resistant coating comprises the following specific steps: (1) Coating graphene on the surface of nano aluminum powder to obtain a layer of coated aluminum powder, and then coating the layer of coated aluminum powder with silane to obtain double-layer coated aluminum powder; (2) Preparing a modified carbon nano tube, namely preparing a zirconia coated carbon nano tube by taking zirconium oxychloride and the carbon nano tube as raw materials; (3) According to parts by weight, mixing 20-30 parts of methylphenyl organic silicon resin, 8-10 parts of organi