Organic and inorganic composite concrete protective coating modified by coupling agents, method for preparing organic and inorganic composite concrete protective coating and application thereof

An inorganic composite and protective coating technology, applied in coatings, anti-corrosion coatings, etc., can solve problems such as easy cracking and incompatibility of organic and inorganic materials, achieve strong alkali resistance, high chemical stability and corrosion resistance, overcome easy cracking effect

Inactive Publication Date: 2018-08-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned shortcomings and deficiencies of the prior art, the object of the present invention is to provide a kind of organic-inorganic composite protective coating modified by a joint agent, which overcomes the problem of easy cracking caused by the incompatibility of organic and inorganic materials, and improves the composite protective coating. Comprehensive performance of layers

Method used

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  • Organic and inorganic composite concrete protective coating modified by coupling agents, method for preparing organic and inorganic composite concrete protective coating and application thereof
  • Organic and inorganic composite concrete protective coating modified by coupling agents, method for preparing organic and inorganic composite concrete protective coating and application thereof

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Embodiment 1

[0036] At room temperature, mix ethyl orthosilicate with deionized water and ethanol at a molar ratio of 1:3:3, and gradually add hydroxyl-terminated polydimethylsiloxane and polysiloxane under the action of magnetic stirring The mass ratio to ethyl orthosilicate is 0.5, and stirred for 20 minutes. Under magnetic stirring, gradually add coupling agent KH560 to modify and prepare an organic-inorganic composite protective coating. The mass ratio of coupling agent to tetraethyl orthosilicate is 0.5, stir for 20 minutes until the solution is uniform, and then slowly add catalyst n-octylamine drop by drop. The molar ratio of n-octylamine and tetraethyl orthosilicate is 0.01, and the mixture is stirred for 4-5 hours until a transparent and stable sol is obtained, and the viscosity of the solution is 50-150 mPa·s. Grind the surface of the concrete to be treated with a grinding wheel, remove the floating slurry on the surface, rinse it with water, dry it naturally, and coat the organi...

Embodiment 2

[0038] At room temperature, mix ethyl orthosilicate with deionized water and ethanol in a molar ratio of 1:4:4, and gradually add hydroxyl-terminated polydimethylsiloxane and polysiloxane under the action of magnetic stirring The mass ratio to ethyl orthosilicate was 1, and stirred for 20 minutes. Under magnetic stirring, gradually add coupling agent KH560 to modify and prepare an organic-inorganic composite protective coating. The mass ratio of coupling agent to tetraethyl orthosilicate is 1, stir for 20 minutes until the solution is uniform, and then slowly add catalyst n-octylamine drop by drop. The molar ratio of n-octylamine and tetraethyl orthosilicate is 0.02, stirred for 4-5 hours to a transparent and stable sol, and the viscosity of the solution is 50-150 mPa·s. Grind the surface of the concrete to be treated with a grinding wheel, remove the floating slurry on the surface, rinse it with water, dry it naturally, and coat the organic-inorganic composite protective coat...

Embodiment 3

[0040] At room temperature, mix ethyl orthosilicate with deionized water and ethanol at a molar ratio of 1:5:5, and gradually add hydroxyl-terminated polydimethylsiloxane and polysiloxane under the action of magnetic stirring The mass ratio to ethyl orthosilicate was 1, and stirred for 20 minutes. Under magnetic stirring, gradually add coupling agent KH560 to modify and prepare an organic-inorganic composite protective coating. The mass ratio of coupling agent to tetraethyl orthosilicate is 1.5, stir for 20 minutes until the solution is uniform, and then slowly add catalyst n-octylamine drop by drop. The molar ratio of n-octylamine to tetraethyl orthosilicate is 0.03, stirred for 4-5 hours to a transparent and stable sol, and the viscosity of the solution is 50-150 mPa·s. Grind the surface of the concrete to be treated with a grinding wheel, remove the floating slurry on the surface, rinse it with water, dry it naturally, and coat the organic-inorganic composite protective coa...

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Abstract

The invention discloses a method for preparing an organic and inorganic composite concrete protective coating modified by coupling agents. The method includes steps of (1), preparing tetraethyl orthosilicate, deionized water and ethyl alcohol according to a molar ratio of 1:(3-6):(3-6) at the room temperature, gradually adding terminal hydroxyl polydimethylsiloxane into the tetraethyl orthosilicate, the deionized water and the ethyl alcohol under magnetic stirring conditions and stirring the terminal hydroxyl polydimethylsiloxane, the tetraethyl orthosilicate, the deionized water and the ethylalcohol for 15-25 min to obtain mixtures; (2), gradually adding the coupling agents into the mixtures at the temperature of 25 DEG C under magnetic stirring conditions, carrying out modification to prepare organic and inorganic composite protective coatings, stirring the organic and inorganic composite protective coatings until solution is uniform, then dropwise adding a catalyst n-octylamine into the solution and stirring the solution and the catalyst n-octylamine until transparent stable sol is obtained. The method has the advantages that protective coatings can be prepared by the aid of sol-gel processes, the method is simple, economical and practical and is low in cost, the organic and inorganic composite concrete protective coating is high in adhesion and corrosion resistance, outstanding in waterproof performance, good in weather resistance and applicable to civil waterproof engineering and waterproof engineering such as tunnel and ocean engineering, and the like.

Description

technical field [0001] The invention relates to the field of waterproof coatings, in particular to an organic-inorganic composite concrete protective coating modified by a coupling agent and a preparation method and application thereof. Background technique [0002] Since the 21st century, with the development of my country's marine economy, more and more marine engineering facilities have been constructed. However, the harsh environment along the coast has caused the durability of concrete to be damaged, and the safety and lifespan have been greatly reduced. If certain protective measures are not taken, it will cause huge waste of resources and economic losses. [0003] As we all know, seawater is highly corrosive, and various marine engineering facilities will inevitably be corroded by harsh marine environments, such as reinforced concrete structures. Reinforced concrete has been widely used in seaside structures. Due to the long-term immersion, erosion and impact of win...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D183/04C09D5/08C04B41/61
Inventor 李方贤巫殷伟余其俊韦江雄陈康卫
Owner SOUTH CHINA UNIV OF TECH
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