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Preparation for organic/inorganic composite corrosion-resisting protective film coating layer for concrete and application thereof

An inorganic composite and corrosion-resistant film technology, which is applied in the preparation of neutral organic/inorganic composite concrete corrosion-resistant film coatings, and in the field of anti-corrosion of reinforced concrete structures, can solve the problems of large gaps in depth, shortened service life, and complicated preparation processes problems, achieve the effects of low cost, enhanced hardness, and simple preparation method

Inactive Publication Date: 2012-05-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the waterproof and anti-corrosion effects of the above coatings can prevent the corrosion of reinforced concrete, they all have some defects, such as poor adhesion, easy aging, short life, and poor alkali resistance.
At the same time, these sealing films seal the capillary channels of concrete, and the escape of water vapor inside the concrete will cause the sealing film to rupture, greatly shortening the service life.
[0008] Although the research in the field of organic-inorganic composite films has been carried out, the number, depth and final results of the research are far behind those of foreign countries. Especially in the application of concrete anticorrosion, most of them still use the introduction of polymer substances (additives) , complexes, etc.) or directly adding nanoparticles for modification, the preparation process is also complicated and difficult to control

Method used

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  • Preparation for organic/inorganic composite corrosion-resisting protective film coating layer for concrete and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Preparation of neutral composite sol: at room temperature, mix TEOS with deionized water and ethanol in a molar ratio of 1:3:3, stir evenly with a magnetic stirrer, add 1% wt of dibutyltin dilaurate, and magnetically Stir for 1.5 h, then add 15% wt of PDMS-OH and magnetically stir for 2 h to form a transparent and stable sol with a viscosity of 4-6 mpa·s.

[0031] 2. The coating is applied by brushing. The C35 concrete used is first placed in the standard room for 28 days of curing. Before brushing, remove dust, oil and other harmful substances and pollutants on the surface of the test piece that are not conducive to the coating film, and rinse. Afterwards, let it dry naturally, so that the surface of the concrete is surface-dry. Each surface of the concrete is brushed three times, and the coating amount is 300g / m2 2 , each time interval is at least 6h. Then send the concrete specimen to the curing room for standard curing for 7 days, the curing temperature is (20±...

Embodiment 2

[0033] 1. Preparation of neutral composite sol: at room temperature, mix TEOS with deionized water and ethanol in a molar ratio of 1:3:3, stir evenly with a magnetic stirrer, add 1% wt of dibutyltin dilaurate, and magnetically Stir for 1.5 h, then add 15% wt of PDMS-OH and magnetically stir for 2 h to form a transparent and stable sol with a viscosity of 4-6 mpa·s.

[0034]2. The coating is applied by brushing. The C35 concrete used is first placed in the standard room for 28 days of curing. Before brushing, remove dust, oil and other harmful substances and pollutants on the surface of the test piece that are not conducive to the coating film, and rinse. Afterwards, let it dry naturally, so that the surface of the concrete is surface-dry. Each surface of the concrete is brushed three times, and the coating amount is 450g / m2 2 , each time interval is at least 6h. Then send the concrete specimen to the curing room for standard curing for 7 days, the curing temperature is (20±3...

Embodiment 3

[0036] 1. Preparation of neutral composite sol: at room temperature, mix TEOS with deionized water and ethanol in a molar ratio of 1:3:3, stir evenly with a magnetic stirrer, add 1% wt of dibutyltin dilaurate, and magnetically Stir for 1.5 h, then add 15% wt of PDMS-OH and magnetically stir for 2 h to form a transparent and stable sol with a viscosity of 4-6 mpa·s.

[0037] 2. The coating is applied by brushing. The C35 concrete used is first placed in the standard room for 28 days of curing. Before brushing, remove dust, oil and other harmful substances and pollutants on the surface of the test piece that are not conducive to the coating film, and rinse. Afterwards, let it dry naturally, so that the surface of the concrete is surface-dry. Each surface of the concrete is brushed three times, and the coating amount is 600g / m2 2 , each time interval is at least 6h. Then send the concrete specimen to the curing room for standard curing for 7 days, the curing temperature is (20±...

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Abstract

The invention discloses a preparation method for an organic / inorganic composite corrosion-resisting protective film coating layer. The method is as follows: blending ethyl orthosilicate, deionized water and ethanol based on a mole ratio of 1: (3-4): (3-5) at room temperature, and adding an organic modifier HTPDMS (hydroxybutyl-terminated polydimethylsiloxane) under the action of catalyst dibutyltin dilaurate. The invention also discloses a neutral organic / inorganic composite corrosion-resisting thin film coating layer and a method for corrosion-resisting coating processing on concrete with the coating layer. The invention prepares the organic / inorganic composite corrosion-resisting thin film coating layer material by the sol-gel technology, wherein the prepared material has advantages of simple preparation method, economy, practicability, low production cost and so on. The production and construction are safe. The prepared material can be widely used for protecting the concrete.

Description

technical field [0001] The invention relates to the field of anti-corrosion materials, in particular to a method for preparing a neutral organic / inorganic composite concrete anti-corrosion film coating prepared by sol-gel technology, and a method for anti-corrosion of reinforced concrete structures by using the coating. Background technique [0002] With the increasing diversity of concrete use environments and the increasing pollution of industrial environments, the erosion of concrete structures by the environment has become increasingly prominent. [0003] It is well known that the corrosion of concrete materials or steel bars by corrosive media is inseparable from the medium of water, such as carbonation, salt corrosion, and chloride ion corrosion. The interior of the concrete is roughly divided into four stages of damage caused by the entry of water. The first stage: water penetration; the second stage: due to water penetration, the reactive silica contained in the con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/50
Inventor 杨辉任志威丁新更
Owner ZHEJIANG UNIV
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