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Waterborne two-component epoxy composition as well as preparation method and application thereof

An epoxy composition, water-based epoxy technology, applied in the direction of epoxy resin coatings, coatings, anti-corrosion coatings, etc., can solve the problems of paint film defects, low degree of curing reaction, and decline in anti-corrosion performance

Active Publication Date: 2020-04-28
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the drying process of the paint film, the solvent and water volatilize too quickly, which often causes cracking of the paint film, especially for systems with thicker film thickness (>50um), the cracking of the paint film is more serious
Adding a catalyst for the curing reaction will cause the initial stage of the curing reaction to be too fast, which will easily cause paint film defects. At the same time, if the curing reaction is too fast in the initial stage, the epoxy resin in the inner core of the epoxy dispersion will not participate in the curing reaction, and the entire curing reaction degree Lower, the anti-corrosion performance has decreased

Method used

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  • Waterborne two-component epoxy composition as well as preparation method and application thereof
  • Waterborne two-component epoxy composition as well as preparation method and application thereof
  • Waterborne two-component epoxy composition as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075]Add 800g of anhydrous polyethylene glycol (Mw=6000) into the reaction flask, heat to 90°C to dissolve the polyethylene glycol, add 50g of hexahydrophthalic anhydride, raise the temperature to 140°C, and react for 2 hours. Continue to add 280g of epoxy resin E20 (that is, the third epoxy resin, epoxy equivalent 500) and 12g of triphenylphosphine to the reactant, continue to keep warm at 140°C, react for 2 hours, and cool to room temperature. Add 1900g epoxy resin E20 (epoxy equivalent 500), 815g epoxy resin E12 (epoxy equivalent 830) and 1500g ethylene glycol butyl ether in the reactant, E20 and E12 are as the first epoxy resin, fully After mixing, keep warm at 70°C, keep the speed of mechanical stirring at 1000 rpm, slowly add 2350g of deionized water to the mixture, and cool to room temperature to obtain a water-based epoxy resin dispersion with a solid content of about 50%. Body, referred to as dispersion I. Dispersion I had an epoxy equivalent weight of 600-700 (base...

Embodiment 2

[0077] Similar to Example 1, add 800g of anhydrous polyethylene glycol (Mw=6000) to the reaction flask, heat to 90°C to dissolve the polyethylene glycol, add 50g of hexahydrophthalic anhydride, raise the temperature to 130°C, and react for 2 hours . Continue to add 280g of epoxy resin E20 (500 epoxy equivalent) and 12g of triphenylphosphine into the reactant, continue to keep warm at 130°C, react for 2 hours, and cool to room temperature. Add 1500g of epoxy resin E20, 1215g of epoxy resin E12 (epoxy equivalent 830) and 1500g of ethylene glycol butyl ether in the reactant, after fully mixing, keep the temperature at 70°C, and the rotating speed of mechanical stirring remains at 800 rpm Minutes, slowly add 2350 g of deionized water dropwise to the mixture, and cool to room temperature to obtain aqueous epoxy resin dispersion II with a solid content of about 50%. Dispersion II has an epoxy equivalent weight of 650-750 (based on solids) and a solvent content of 19.5%.

Embodiment 3

[0079] Add 600g of anhydrous polyethylene glycol (Mw=6000) into the reaction flask, heat to 90°C to dissolve the polyethylene glycol, add 37g of hexahydrophthalic anhydride, raise the temperature to 150°C, and react for 2 hours. Continue to add 210g of epoxy resin E20 (500 epoxy equivalent) and 10g of triphenylphosphine into the reactant, keep warm at 150°C, react for 2 hours, and cool to room temperature. Add 3000g of epoxy resin E20 and 1150g of ethylene glycol butyl ether to the reactant, mix well, keep warm at 70°C, keep the speed of mechanical stirring at 1200 rpm, and slowly drop 2700g of deionized water into the mixture , cooled to room temperature, the aqueous epoxy resin dispersion III with a solid content of about 50% can be obtained. Dispersion III has an epoxy equivalent weight of 550-650 (based on solid content), and a solvent content of 15.0%.

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Abstract

The invention provides a waterborne two-component epoxy composition as well as a preparation method and application thereof. The composition comprises a component A containing a waterborne epoxy resindispersion and a component B containing a waterborne epoxy curing agent, wherein the waterborne epoxy resin dispersion is a system formed by dispersing emulsified first epoxy resin into a water phase; and the waterborne epoxy curing agent is a polyethylene polyamine curing agent modified by second epoxy resin. According to the invention, the quick-drying waterborne two-component epoxy compositionis obtained, and a paint film obtained by using the composition has the advantages of low VOC, higher drying speed, better film-forming property, no cracking during thick coating and excellent corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of paint preparation, in particular to a water-based two-component epoxy composition and its preparation method and application. Background technique [0002] The two-component epoxy composition is based on epoxy resin, cross-linked and cured by polyamine curing agent, and matched with suitable pigments and fillers, it can play a better anti-corrosion effect, and can be used in containers, construction machinery, Anti-corrosion primers and intermediate paints for rail transit, building steel structures, bridges, ships, etc. [0003] During the use of epoxy resin, it needs to be dissolved and diluted with solvents such as xylene and n-butanol. Organic solvents account for about 40% of solvent-based epoxy rich paint primers. In the painting process, in order to ensure the smooth progress of the construction, it is often necessary to add about 20% organic solvents to the paint as diluents before construction....

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D5/08C09D7/61C08G59/50
CPCC08G59/504C08K2003/2241C08K2003/3045C08K2003/328C09D5/08C09D163/00C09D7/61C08K3/22C08K3/30C08K3/32C08K3/34C08K3/04
Inventor 曲瑞张成彬孙少文李卫飞王晓孙伟祖纪学顺邓俊英孙家宽
Owner WANHUA CHEM GRP CO LTD
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