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A kind of waterborne epoxy resin curing agent and preparation method thereof

A water-based epoxy resin and epoxy resin technology, applied in the direction of epoxy resin coatings, coatings, etc., can solve the problems of inability to apply on a large scale, fast curing speed, poor impact performance, etc., achieve low production costs and improve compatibility Good performance and impact resistance

Active Publication Date: 2021-04-13
RICH CHEM SONGZI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyamide epoxy curing agent has poor hydrophilicity, poor compatibility with epoxy resin, short operating time, fast curing speed and short application period when used, and the prepared coating film has low strength and low flexibility. Poor, poor impact performance, and the coating film is brittle, so it cannot be used in large-scale actual production

Method used

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  • A kind of waterborne epoxy resin curing agent and preparation method thereof
  • A kind of waterborne epoxy resin curing agent and preparation method thereof

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preparation example Construction

[0025] The preparation method of the above-mentioned water-based epoxy resin curing agent includes the following steps: first mix the fatty amine and the multi-component organic acid evenly, then heat up to 110-130°C, add polyether amine, react at constant temperature for 1-3 hours, and then add epoxy resin , heating up to 140-160°C, and reacting at constant temperature for 2-4 hours to obtain a water-based epoxy resin curing agent.

[0026] Preferably, the polyetheramine is added dropwise, and the dropwise addition is completed within 20-40 minutes.

Embodiment 1

[0029] Mix 70g of m-xylylenediamine and 90g of industrial dimer acid evenly and add to the reaction vessel, then add 20g of monoaminopolyether dropwise into the reaction vessel at 120°C, the addition is completed within 30min, and the reaction is carried out at constant temperature for 3h. Add 20g of epoxy resin E-51 into the reaction vessel, raise the temperature to 150°C, react at constant temperature for 3 hours, start to titrate the amine value, stop the reaction after the amine value is stable, and obtain a water-based epoxy resin curing agent (amine value: 211mgKOH / g).

Embodiment 2

[0031] Mix 60g of diethylenetriamine and 100g of industrial dimer acid evenly and add to the reaction vessel, then add 15g of monoaminopolyether dropwise into the reaction vessel at 120°C, the addition is completed within 20min, and the constant temperature reaction is 3h, and then 13g Epoxy resin E-51 was added into the reaction vessel, the temperature was raised to 140°C, and the reaction was performed at constant temperature for 4 hours. The titration of the amine value was started, and the reaction was stopped after the amine value stabilized to obtain a water-based epoxy resin curing agent (the amine value was 237 mgKOH / g).

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Abstract

The invention discloses a water-based epoxy resin curing agent and a preparation method thereof. The water-based epoxy resin curing agent is obtained through condensation reaction of fatty amine, multi-component organic acid, polyether amine and epoxy resin. The preparation method is as follows: firstly mix fatty amine and multi-component organic acid evenly, then heat up to 110-130°C, add polyether amine, react at constant temperature for 1-3 hours, then add epoxy resin, heat up to 140-160°C, and react at constant temperature 2 to 4 hours to obtain a water-based epoxy resin curing agent. The water-based epoxy resin curing agent of the present invention has good dispersibility in water, good compatibility with epoxy resin, no volatile matter, safety and environmental protection, and the paint film obtained by curing water-based epoxy resin has high hardness and toughness. it is good.

Description

technical field [0001] The invention relates to a water-based epoxy resin curing agent and a preparation method thereof. Background technique [0002] In recent years, with the increasingly stringent requirements for environmental protection, water-based epoxy systems that do not contain volatile organic solvents or low volatile organic solvents (VOC), and do not contain hazardous air pollutants (NHAP) have become a current research hotspot. . There are many methods for water-based modification of epoxy curing agents, and the more common ones are amidation modification, polyamide modification, and epoxy amine addition modification. At present, the most commonly used curing agent in the field of epoxy anti-corrosion coatings is polyamide epoxy curing agent, that is, polyamide modified epoxy curing agent. However, the polyamide epoxy curing agent has poor hydrophilicity, poor compatibility with epoxy resin, short operating time, fast curing speed and short application period...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/40C08G59/14C09D163/00
CPCC08G59/1438C08G59/1477C08G59/4007C09D163/00
Inventor 陈小金
Owner RICH CHEM SONGZI