Self-emulsifying waterborne epoxy resin curing agent and preparation method thereof

A technology of water-based epoxy resin and epoxy resin, which is applied in the direction of epoxy resin coatings, coatings, anti-corrosion coatings, etc., can solve the problems of unstable curing performance, and achieve high curing activity, good heat resistance, and high boiling point. Effect

Pending Publication Date: 2020-06-05
陕西立高涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the traditional water-based epoxy curing agents are organic amine modified epoxy ionic epoxy curing agents, and the curing performance is unstable

Method used

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  • Self-emulsifying waterborne epoxy resin curing agent and preparation method thereof
  • Self-emulsifying waterborne epoxy resin curing agent and preparation method thereof
  • Self-emulsifying waterborne epoxy resin curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of self-emulsifying waterborne epoxy resin curing agent comprises the following steps:

[0035] Step 1: Dissolve 1 part of aminomethylsiloxane in 50 parts of propylene glycol ether, then add 0.15 parts of reaction auxiliary ethylenediamine, stir evenly, and add 20 parts of A mixed solution composed of E-51 epoxy resin and 50 parts of propylene glycol ethyl ether, after the dropwise addition is completed, continue to react at 70°C for 3h;

[0036] Step 2: Continue to add a mixed solution consisting of 1 part of end-capping agent glycidyl methacrylate and 20 parts of propylene glycol ethyl ether dropwise at a constant speed under the condition of 75 ° C and an inert gas atmosphere. The reaction is carried out for 0.5 hours, and the reaction is continued for 2 hours. Cool down to 60°C;

[0037] Step 3, adding 0.1 parts of citric acid to adjust the stability of the emulsion, and distilling under reduced pressure at a vacuum degree of 2kPa and a tempe...

Embodiment 2

[0040] The preparation method of self-emulsifying waterborne epoxy resin curing agent comprises the following steps:

[0041] Step 1: Dissolve 5 parts of aminopolydimethylsiloxane in 80 parts of propylene glycol ether, then add 0.15 parts of reaction auxiliary triethylamine, stir evenly, and dropwise add the A mixed solution composed of 10 parts of E-44 epoxy resin, 10 parts of E-51 epoxy resin and 50 parts of propylene glycol ethyl ether, after the dropwise addition is completed, continue to react at 70 ° C for 3 hours;

[0042] Step 2, continue to add a mixed solution consisting of 2 parts of capping agent butyl glycidyl ether and 20 parts of propylene glycol ether at a constant speed under the condition of 75 ° C and an inert gas atmosphere, capping reaction for 1 hour, continue the reaction for 2 hours, and then lower the temperature to 65°C;

[0043] Step 3, adding 1 part of citric acid to adjust the stability of the emulsion, and distilling under reduced pressure at a v...

Embodiment 3

[0046] The preparation method of self-emulsifying waterborne epoxy resin curing agent comprises the following steps:

[0047] Step 1, dissolve 5 parts of aminopolydimethylsiloxane and 5 parts of diaminopolydimethylsiloxane in 100 parts of dipropylene glycol methyl ether, then add 0.1 part of triethylamine and 0.2 part of ethylenediamine, Stir evenly, and add 20 parts of E-51 epoxy resin, 10 parts of E-20 epoxy resin, 50 parts of propylene glycol ethyl ether, and 50 parts of propylene glycol butyl ether dropwise at a constant speed under the condition of 80 ° C and an inert gas atmosphere. After the addition is complete, continue to react at 85°C for 2h;

[0048] Step 2: Continue to add a mixed solution consisting of 3 parts of capping agent butyl glycidyl ether and 20 parts of propylene glycol ethyl ether dropwise at a constant speed under the condition of 85 °C and an inert gas atmosphere. 65°C;

[0049] Step 3, adding 1 part of citric acid to adjust the stability of the em...

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Abstract

The invention discloses a self-emulsifying waterborne epoxy resin curing agent, which is prepared from 1 to 10 parts of amino silicon oil, 20 to 30 parts of epoxy resin, 0.01 to 5 parts of a reactionauxiliary agent, 120 to 250 parts of a solventand 1 to 10 parts of an end-capping agent. The preparation method comprises the following steps: firstly, dissolving amino silicone oil in thesolvent, then adding the reaction aid, uniformly stirring, dropwise adding a mixed solution of epoxy resin and the solvent at a constant speed under the condition of 60-80 DEG C and in an inert gas atmosphere, and continuously reacting after dropwise adding is finished; continuously dropwise adding a mixed solution of the end-capping reagent and the solvent at a constant speed, and carrying out an end-cappingreaction; and finally adding a regulator, and carrying out reduced pressure distillation. The self-emulsifying waterborne epoxy resin curing agent disclosed by the invention has self-emulsifying anddefoaming properties, and can have excellent curing properties for different waterborne epoxy resins, so that a cured epoxy resin film has good properties such as heat resistance, weather resistance,electric insulativity, chemical resistance and hydrophobicity.

Description

technical field [0001] The invention relates to the technical field of epoxy resin curing, in particular to a self-emulsifying water-based epoxy resin curing agent and a preparation method thereof. Background technique [0002] Epoxy resin coatings are widely used in the coatings industry due to their excellent performance. However, solvent-based epoxy coatings contain organic solvents that are harmful to the ecological environment and humans, so pollution-free, green and environmentally friendly water-based epoxy coatings will be the future trend. In recent years, the research on water-based epoxy resins has been increasing day by day. Most of the water-based epoxy resins have introduced hydrophilic groups into the main structure of the resins, which will cause the loss of epoxy groups and lead to poor curing effect of epoxy resins. Therefore, it is of great significance to realize the water-based epoxy resin by synthesizing self-emulsifying water-based epoxy curing agent....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/14C08G59/16C08G77/42C08G59/40C09D163/00C09D5/25C09D5/08
CPCC08G59/1477C08G59/1472C08G77/42C08G59/4085C09D163/00C09D5/00C09D5/18C09D5/08
Inventor 薛睿智
Owner 陕西立高涂料有限公司
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