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Preparation method for self-emulsifying type nonionic waterborne epoxy curing agent

A water-based epoxy, self-emulsifying technology, applied in the direction of epoxy resin coatings, coatings, etc., can solve the problems of prolonged curing period, decreased film hardness, low compressive strength, etc., to improve the hardness of cured film, attached Strong focus, high film gloss effect

Active Publication Date: 2019-02-22
MIANYANG HUILI EPOXY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the introduction of a large number of polyether chain segments improves the film-forming flexibility and impact resistance, it also leads to problems such as prolonged curing cycle, low compressive strength, and decreased film-forming hardness.

Method used

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  • Preparation method for self-emulsifying type nonionic waterborne epoxy curing agent
  • Preparation method for self-emulsifying type nonionic waterborne epoxy curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Add 100g of epoxy resin E-51 into a three-neck flask with reflux and thermometer, add 15g of polyether monoamine dropwise at 75-85°C continuously, and keep warm for 1 hour after the dropwise addition to obtain a modified epoxy resin. Wherein the polyether monoamine HLB=13.8.

[0034] 2) Add 73g of diethylenetriamine and 73g of ethanol to a three-necked flask equipped with a condenser and a thermometer, and continuously add dropwise a mixed solution of 115g of modified epoxy resin and 11.5g of ethanol prepared under stirring conditions at 65 to 75°C. Continue to keep warm for 20min to obtain the epoxy-amine intermediate after adding.

[0035] 3) Slowly add 89 g of n-butyl glycidyl ether dropwise to the epoxy-amine intermediate at 65-75°C, and continue stirring for 30 minutes at 65-75°C after the addition is completed.

[0036] 4) Ethanol and unreacted small molecular substances are removed by distillation.

[0037] 5) Add 230g deionized water to obtain light yellow ...

Embodiment 2

[0039] 1) Add 203g of epoxy resin E-51 into a three-neck flask with reflux and thermometer, add 40g of polyether monoamine dropwise at 70-80°C continuously, and keep warm for 30min after the addition to obtain a modified epoxy resin. Wherein the polyether monoamine HLB=17.

[0040] 2) Add 150g triethylenetetramine and 150g ethanol to the reaction kettle equipped with condenser and thermometer, and continuously add dropwise the mixed solution of 243g modified epoxy resin and 24.3g ethanol prepared under stirring condition at 60~70°C, drop Continue to keep warm for 20min to obtain the epoxy-amine intermediate after adding.

[0041] 3) Slowly add 310g of C12-C24 alkyl glycidyl ether dropwise to the epoxy-amine intermediate at 75-85°C, and continue stirring for 30 minutes at 60-70°C after the addition is completed.

[0042] 4) Ethanol and unreacted small molecular substances are removed by distillation.

[0043] 5) Add 297g deionized water to obtain light yellow transparent wate...

Embodiment 3

[0045] 1) Add 135g of epoxy resin E-51 into a three-neck flask with reflux and thermometer, add 20g of polyether monoamine dropwise at 60-70°C continuously, and keep warm for 30min after the addition to obtain modified epoxy resin. Wherein the polyether monoamine HLB=18.6.

[0046] 2) Add 100g of triethylenetetramine and 100g of ethanol to the reaction kettle equipped with a condenser and a thermometer, and continuously add dropwise the mixed solution of 155g of modified epoxy resin and 15.5g of ethanol prepared under stirring conditions at 65 to 75°C. Continue to keep warm for 20min to obtain the epoxy-amine intermediate after adding.

[0047] 3) Slowly add 112 g of benzyl glycidyl ether dropwise to the epoxy-amine intermediate at 65-75°C, and continue stirring for 30 minutes at 65-75°C after the addition is complete.

[0048] 4) Ethanol and unreacted small molecular substances are removed by distillation.

[0049] 5) Add 633g deionized water to obtain light yellow transpar...

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Abstract

The invention discloses a preparation method for a self-emulsifying type nonionic waterborne epoxy curing agent. The preparation method comprises the following steps: 1) controlling temperature at 60-85 DEG C and dropwise adding polyether monamine into a liquid epoxy resin, thereby acquiring a modified epoxy resin; 2) controlling temperature at 60-75 DEG C and dropwise adding a modified epoxy resin ethanol solution into an ethanol solution of polyamine, thereby acquiring an epoxy-amine intermediate; 3) controlling temperature at 60-75 DEG C and dropwise adding a monofunctional glycidyl ether into the epoxy-amine intermediate for terminating; 4) distilling for removing solvent and unreacted micro-molecules; 5) adding deionized water according to the requirement, thereby acquiring the self-emulsifying type nonionic waterborne epoxy curing agent with required solid content or viscosity. The nonionic waterborne epoxy curing agent prepared according to the invention, mixed with the liquid epoxy resin, has high curing hardness, high adhesion and high film-forming glossiness.

Description

technical field [0001] The invention relates to a curing agent, in particular to a preparation method of a self-emulsifying non-ionic water-based epoxy curing agent, and belongs to the technical field of paint preparation. Background technique [0002] Water-based epoxy resin coatings use water as a dispersant, and they have attracted people's attention because they can be cured at room temperature in a high-humidity environment, low volatile organic compounds (VOC), and small odors, which are friendly to humans and the environment. It has been widely used in floor coating materials, especially in industrial electronics factories. [0003] In the water-based solution of epoxy resin, the solution of emulsifying liquid epoxy resin with water-based epoxy curing agent is the most typical, and its common synthesis route is mainly such as patent ZL200910063839. In addition to the compatibility of amines and epoxy resins, the water solubility of macromolecules can be solved by par...

Claims

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Application Information

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IPC IPC(8): C09D163/00C08G59/50C08G59/64
CPCC08G59/504C08G59/64C09D163/00
Inventor 刘健周鸿飞陆南平
Owner MIANYANG HUILI EPOXY ENG
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