Hole sealing agent, preparation method and application thereof, coating film, preparation method of coating film and anti-corrosion product

A technology of sealing agent and coating film, which is applied in the direction of anti-corrosion coating, surface reaction electrolytic coating, coating, etc., can solve the problems of low temperature resistance, restriction, and restriction of the use of inorganic sealing agent, so as to improve high temperature resistance, Improve the effect of high temperature resistance and reduce agglomeration

Active Publication Date: 2020-09-29
GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the sealing agent is mainly divided into organic sealing agent and inorganic sealing agent. Due to its own volatility and pyrolysis, the use of organic sealing agent in high temperature environment is limited. The sealing agent is modified, and it cannot meet the needs of high-temperature environments.
Inorganic sealing agents mainly include silicate and phosphate sealing agents, etc., which have certain high temperature resistance; however, silicate sealing agents are generally suitable for medium and low temperatures below 500°C, and are not resistant to high temperatures; Phosphate sealers have poor water resistance
These deficiencies limit the use of inorganic sealing agents in high temperature and harsh environments

Method used

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  • Hole sealing agent, preparation method and application thereof, coating film, preparation method of coating film and anti-corrosion product
  • Hole sealing agent, preparation method and application thereof, coating film, preparation method of coating film and anti-corrosion product

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preparation example Construction

[0054] One embodiment of the present invention also provides a method for preparing a sealing agent, comprising the following steps:

[0055] Mix oxidation-modified nano-aluminum powder, oxidation-modified nano-nickel powder, nano-titanium dioxide and nano-silicon dioxide, add them to the silica sol, and then add a silane coupling agent to prepare the sealing agent.

[0056] On the one hand, the modified oxidation-modified nano-aluminum powder and oxidation-modified nano-nickel powder form protective oxides on the surface, which can resist the erosion of corrosive substances; and have high dispersibility, which can penetrate into the coating effectively On the other hand, due to the nanoparticle effect, during the use of the sealing agent, the oxidation-modified nano-aluminum powder and oxidation-modified nano-nickel powder can be further oxidized at a lower temperature to form dense dioxide Aluminum and nickel oxide, together with nano-titanium dioxide and nano-silicon dioxid...

Embodiment 1

[0099] 1) Heat the nano-aluminum powder to 90°C under the condition of being filled with Ar gas, and then slowly fill it with a mixture of argon, water vapor and oxygen, wherein the volumes occupied by argon, water vapor and oxygen are respectively 65%, 33% and 2%, after reacting for 30-60 minutes, move the nano-aluminum powder to a normal temperature protective gas for cooling to obtain an oxidation-modified nano-aluminum powder.

[0100] 2) Heat the nano-nickel powder to 100°C in a protective gas filled with Ar gas, and then slowly fill it with a mixture of argon, water vapor and oxygen, wherein the volumes occupied by argon, water vapor and oxygen are respectively 65%, 33% and 2%, after reacting for 30-60 minutes, move the nano-nickel powder to normal temperature protective gas for cooling to obtain oxidation-modified nano-nickel powder.

[0101] 3) Mix 6g of ethyl orthosilicate, ethanol with a volume ratio of 4:1 to ethyl orthosilicate, and 0.75g of silane coupling agent, ...

Embodiment 2

[0108] 1) Heat the nano-aluminum powder to 90°C under the condition of being filled with Ar gas, and then slowly fill it with a mixture of argon, water vapor and oxygen, wherein the volumes occupied by argon, water vapor and oxygen are respectively 65%, 33% and 2%, after reacting for 30-60 minutes, move the nano-aluminum powder to a normal temperature protective gas for cooling to obtain an oxidation-modified nano-aluminum powder.

[0109] 2) Heat the nano-nickel powder to 100°C in a protective gas filled with Ar gas, and then slowly fill it with a mixture of argon, water vapor and oxygen, wherein the volumes occupied by argon, water vapor and oxygen are respectively 65%, 33% and 2%, after reacting for 30-60 minutes, move the nano-nickel powder to normal temperature protective gas for cooling to obtain oxidation-modified nano-nickel powder.

[0110] 3) Mix 4.2g tetraethyl orthosilicate, ethanol with a volume ratio of 4:1 to tetraethyl orthosilicate, and 0.525g silane coupling ...

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Abstract

The invention relates to a hole sealing agent, a preparation method and application thereof, a coating film, a preparation method of the coating film and an anti-corrosion product. The hole sealing agent comprises oxidation modified nano aluminum powder, oxidation modified nano nickel powder, nano titanium dioxide, nano silicon dioxide, a silane coupling agent and silicon dioxide sol, wherein protective oxides are formed on the surfaces of the modified oxidation-modified nano aluminum powder and oxidation-modified nano nickel powder, can resist corrosion of corrosive substances, have high dispersity and can permeate into defective positions in the coating; meanwhile, the silicon dioxide sol can promote the dispersion of nanoparticles, and the silicon dioxide sol and the silane coupling agent can form an effective hole sealing layer on the surface of the coating; the nano titanium dioxide powder and the nano silicon dioxide powder are uniformly dispersed under the action of the silane coupling agent, so that agglomeration of the nano powder can be reduced, pores of the coating can be effectively filled with nano particles in the hole sealing process, and the high-temperature resistance and the corrosion resistance of the coating are further improved.

Description

technical field [0001] The invention relates to the technical field of coating sealing, in particular to a sealing agent, a preparation method and application thereof, a coating film and a preparation method thereof, and anti-corrosion products. Background technique [0002] Due to long-term exposure to high temperature and corrosive media, boiler water walls are prone to severe corrosion, resulting in huge economic losses. At present, the most economical and effective anti-corrosion measure for boiler water wall is to prepare thermal spray coating on its surface by thermal spraying technology, so as to prolong the service life of boiler water wall. However, since coal-fired power generation uses high-sulfur coal and high-chloride coal, corrosive media containing sulfur and chlorine will be produced during the use of boiler water walls, which will corrode and destroy the protective oxide film formed by thermal spray coating; At the same time, there are certain pores in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D5/10C09D7/61C09D7/62C25D11/24
CPCC09D1/00C09D5/103C09D5/18C09D7/61C09D7/62C25D11/246
Inventor 倪进飞熊义刘光明张炜李茂东
Owner GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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