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Waterborne epoxy zinc-rich coating rich in microcapsule structure modified zinc powder and its preparation

A water-based epoxy zinc-rich, microcapsule structure technology, used in epoxy resin coatings, anti-corrosion coatings, coatings, etc., can solve the problem of poor corrosion resistance and water resistance of film-forming systems, insufficient dispersion of zinc powder, and volatility. The problem of high organic content can improve the water resistance and impact resistance of the paint film, good low temperature curing performance, and improve the dispersion performance.

Active Publication Date: 2019-03-01
上海德威涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the solution in scheme 1 has the disadvantage of insufficient on-site zinc powder dispersion, while the second and third solutions use a large proportion of hydrophilic polar organic solvents, so their volatile organic compound content (VOC) is still relatively high. high
In addition, in the third solution, since the molecular structure of the modified epoxy resin contains a large number of polar modification groups, the anti-corrosion performance of the film-forming material system, especially the water resistance performance, is poor.

Method used

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  • Waterborne epoxy zinc-rich coating rich in microcapsule structure modified zinc powder and its preparation
  • Waterborne epoxy zinc-rich coating rich in microcapsule structure modified zinc powder and its preparation
  • Waterborne epoxy zinc-rich coating rich in microcapsule structure modified zinc powder and its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1 A kind of polysilane modified zinc powder

[0052] Add 0.45 g of commercially available Z-6172 Silane polysilane from Dow Corning Company to 450 g of isopropanol to prepare a polysilane treatment agent. Spray the prepared polysilane treatment agent mist onto the zinc powder surface within 10 minutes in the rotary furnace, continue to stir for 10 minutes, make it fully mixed, and remove the isopropanol solvent under vacuum to obtain 59.5g polysilane Modified zinc powder.

Embodiment 2

[0053] Embodiment 2 is rich in the waterborne epoxy zinc-rich paint of microcapsule structure modified zinc powder

[0054] Add 0.45 g of polysilane to 450 g of isopropanol to make polysilane treatment agent. Spray the prepared polysilane treatment agent alcohol aqueous solution mist on the surface of zinc powder within 10 minutes in a rotary furnace, continue stirring for 10 minutes, make it fully mixed, and remove the isopropanol solvent under vacuum to obtain 59.5g Polysilane modified zinc powder.

[0055] Premix 20.24g of epoxy emulsion, 0.75g of bentonite, 0.82g of fumed silica, 2.88g of propylene glycol phenyl ether, and 5.23g of deionized water, and add 59.50g of the above-mentioned polysilane-modified zinc powder to the above-mentioned mixture under stirring In the process, disperse the mixture at a high speed for more than 30 minutes at a speed of not less than 1500 rpm until the fineness is less than 40 microns.

[0056] Mix 5.08 g of epoxy resin amine adduct 1 and...

Embodiment 3

[0058] Embodiment 3 is rich in the waterborne epoxy zinc-rich paint of microcapsule structure modified zinc powder

[0059] Add 0.42 g of polysilane to 420 gram of isopropanol to make polysilane treatment agent. Spray the prepared polysilane treatment agent alcohol aqueous solution mist on the zinc powder surface within 10 minutes in the rotary furnace, continue to stir for 10 minutes, make it fully mixed, and remove the isopropanol solvent under vacuum to obtain 56.2g Polysilane modified zinc powder.

[0060] Premix 22.4g of epoxy emulsion, 0.7g of bentonite, 0.8g of fumed silica, 2.94g of propylene glycol phenyl ether, and 5.07g of deionized water, and add 56.2g of the above-mentioned polysilane-modified zinc powder to the above mixture under stirring In the process, disperse the mixture at a high speed for more than 30 minutes at a speed of not less than 1500 rpm until the fineness is less than 40 microns.

[0061] Mix 5.54 g of epoxy resin amine adduct 1 and 2.3 g of epo...

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Abstract

The invention provides polysilane-modified zinc powder and a waterborne epoxy zinc-rich coating which is prepared through the polysilane-modified zinc powder and is rich in microcapsule-structured modified zinc powder. According to the coating, zinc powder is adsorbed and wrapped with hydrolysable polyfunctional polysilane, the outer-side chain of the polysilane has the very low surface energy, the tight microcapsule-structured modified zinc powder with the water repelling effect can be formed, long-time stable existence of the modified zinc powder in epoxy emulsion is achieved, and the purpose that a main agent and a curing agent of the waterborne epoxy resin zinc-rich coating are both waterborne is achieved; meanwhile, emulsified epoxy and a curing agent prepared by mixing epoxy resin amine adducts with the different reactivities serve as main film forming substances, and uniformity of the reactivities and the anti-corrosion property is achieved by regulating the proportional relation of the curing agent. The prepared waterborne epoxy zinc-rich coating has the comprehensive advantages of being good in storing stability, low in VOC content, good in adhesive force on a substrate and the like.

Description

technical field [0001] The invention relates to a two-component water-based epoxy zinc-rich primer, in particular to a polysilane-modified zinc powder, and a water-based epoxy zinc-rich paint rich in microcapsule structure modified zinc powder prepared by using the same. Preparation. Background technique [0002] Since zinc is an active metal, it is easy to undergo hydrogen evolution reaction with water, so the current water-based epoxy zinc-rich primer on the market adopts the method of storing zinc powder and water-containing components separately, and widely uses zinc powder to be packaged separately in another non-water-containing component. form, which mainly includes the following three solutions: [0003] 1. It adopts three-component packaging, that is, water-based epoxy resin emulsion and hydrophilic curing agent are used as the base material, zinc powder is used as the filler, and the three components are individually packaged. This approach avoids the contact bet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D7/62C09D5/10
CPCC08K3/08C08K3/346C08K3/36C08K9/04C08K13/06C08K2003/0893C09D5/106C09D7/62C09D163/00
Inventor 张晓村冯志国张海鹏雷振国
Owner 上海德威涂料有限公司
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