Water-based epoxy curing agent based on castor oil triglycidyl ether and preparation method of curing agent

A technology of triglycidyl ether and diglycidyl ether, applied in the field of water-based epoxy curing agent and its preparation, can solve the problems of difficult control of TMPEG dosage, poor water resistance, slow surface drying speed, etc., and achieves good formula adjustability and adaptability, improve anti-corrosion performance, increase the effect of cross-linking degree

Active Publication Date: 2020-02-04
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using this kind of water-based epoxy curing agent to prepare coatings, there are problems such as slow surface drying speed, short pot life, whitening, foaming and poor water resistance of the coating film during the film forming process.
For example, the patent CN1958639A discloses a preparation method of a water-based epoxy curing agent. The water-based epoxy curing agent is finally prepared by neutralizing acetic acid to form a salt, but the addition of an organic acid will cause the product to be unstable in storage, and it is easy to cause rust on

Method used

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  • Water-based epoxy curing agent based on castor oil triglycidyl ether and preparation method of curing agent
  • Water-based epoxy curing agent based on castor oil triglycidyl ether and preparation method of curing agent
  • Water-based epoxy curing agent based on castor oil triglycidyl ether and preparation method of curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Add 13.16g (0.09mol) triethylenetetramine to a three-necked flask equipped with a stirrer and a condenser, heat to 65°C, then slowly add 14.11g (0.036mol) bisphenol A epoxy resin E51 Mix with 4.95g (0.009mol) of polyethylene glycol diglycidyl ether, and continue to react at 65°C for 3h to obtain -NH at both ends. 2 Epoxy-polyamine adduct 0.045mol.

[0036] (2) Slowly add 16.52g (0.015mol) of castor oil triglycidyl ether into the epoxy-polyamine adduct obtained in step (1), and continue to react at 65°C for 3h to obtain a three-branch terminal -NH 2 Based prepolymer 0.015mol.

[0037] (3) Add 5.85 g (0.045 mol) of n-butyl glycidyl ether to the prepolymer obtained in step (2), and continue to react at 65° C. for 3 h to obtain a product whose terminal primary amine hydrogen has been blocked.

[0038] (4) Add deionized water to the product obtained in step (3), stir at 65° C. for 1 h, and adjust to obtain a three-branched water-based epoxy curing agent with a solid co...

Embodiment 2

[0040] Compared with Example 1, the preparation of a water-based epoxy curing agent based on castor oil triglycidyl ether of the present example is different in that the added triethylenetetramine is 15.13g (0.1mol), and the rest is completely same.

Embodiment 3

[0042]Compared with Example 1, the preparation of a water-based epoxy curing agent based on castor oil triglycidyl ether of the present example, the difference is that the added bisphenol A epoxy resin E51 is 10.58g (0.027mol) , polyethylene glycol diglycidyl ether is 9.9g (0.018mol), and the rest are identical.

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Abstract

The invention belongs to the technical field of coatings, and discloses a water-based epoxy curing agent based on castor oil triglycidyl ether and a preparation method of the curing agent. The preparation method comprises the following steps: performing a reaction on bisphenol epoxy resin, polyetherol diglycidyl ether and a polyamine to prepare an epoxy-polyamine addition product with -NH2 groupsat two ends, adding the castor oil triglycidyl ether, performing a branching reaction to obtain a prepolymer with -NH2 groups at three branched chain tail ends, adding a monoepoxy compound to block terminal primary amine hydrogen, and finally adding water for dispersion to obtain the water-based epoxy curing agent. The water-based epoxy curing agent obtained by the method has the advantages of a long pot life, low viscosity and easy construction when used with water-based epoxy resin, and the cured product has a large cross-linking degree, has good flexibility while having good corrosion resistance, and overcomes the defects of low toughness and high brittleness of an ordinary epoxy coating layer.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a water-based epoxy curing agent based on castor oil triglycidyl ether and a preparation method thereof. Background technique [0002] Water-based epoxy coatings are one of the representative works of water-based coatings, which have the advantages of low VOC content, low odor, low flammability, high safety and easy cleaning with water. Since epoxy resin is a thermosetting resin, it has no function when it is formed into a film alone. Only when water-based epoxy curing agent is added, can it form a three-dimensional network cross-linked structure, showing excellent performance. In the water-based epoxy curing agent, water is used as a solvent or dispersion medium. Due to the high surface tension and evaporation heat of water, the water-based curing agent has a long drying time for film formation, poor wetting and dispersing performance, and low temperature curing is ...

Claims

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Application Information

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IPC IPC(8): C08G59/50C08G59/18C08G59/32C09D5/08C09D163/00
CPCC08G59/184C08G59/3209C08G59/5013C09D5/08C09D163/00
Inventor 夏正斌董玉强吴雪妮吴雪美
Owner SOUTH CHINA UNIV OF TECH
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