Toughening type waterborne epoxy curing agent as well as preparation method and application thereof

A water-based epoxy and toughening technology, applied in the direction of epoxy resin coatings, coatings, etc., can solve problems such as no good, achieve good stability and construction performance, easy operation, and strong industrial applicability

Active Publication Date: 2021-08-06
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no good solution to the aforementioned problems, and there is an urgent need for a curing agent with good water dispersion performance, good compatibility with epoxy resin, and good flexibility.

Method used

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  • Toughening type waterborne epoxy curing agent as well as preparation method and application thereof
  • Toughening type waterborne epoxy curing agent as well as preparation method and application thereof
  • Toughening type waterborne epoxy curing agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Pour 100g of dimer acid into the kettle, then inject 135g of epoxy resin E51, stir evenly, add the catalyst triphenylphosphine, react at a constant temperature of 100°C for 3 hours, and discharge to obtain toughened epoxy resin A1. Wherein, the molar ratio n1 of the total amount of epoxy groups in the epoxy resin to the total amount of carboxyl groups in the dimer acid is 2:1.

Embodiment 2-4

[0060] Prepare toughening type epoxy resin respectively according to the method in preparation example 1, be denoted as A2 and A3, A4, and its reaction condition is as shown in table 2:

[0061] Different reaction conditions in table 2, preparation embodiment 1-4

[0062]

[0063] [Example 1] (i.e. S1)

[0064] Follow the steps below to prepare a waterborne epoxy curing agent:

[0065] Step A: Add 80g of epoxy resin E51 and 20g of toughened epoxy resin A1 into a beaker, stir evenly, add 300g of isophoronediamine into the reaction bottle, and preheat the temperature to 80°C; The resin component was gradually dropped into the reaction bottle to carry out the ring-opening reaction. The dropping time was 2 hours, and the temperature was continued for 1 hour after the dropping; Phoronediamine removal.

[0066] Step B, then add 35g propylene glycol methyl ether into the system, and then use a peristaltic pump to gradually drop 52g butyl glycidyl ether and 80g methoxypolyethyle...

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Abstract

The invention discloses a toughening type waterborne epoxy curing agent as well as a preparation method and application thereof. The curing agent is prepared from the following raw materials in parts by weight: 1 part of epoxy resin; 0.65 to 6 parts of a polyamine compound; 0.1 to 1 part of toughening type epoxy resin; 0.25 to 1.25 parts of a single epoxy reactive diluent; and 0.2 to 1 part of alkyl polyethylene glycol monoglycidyl ether. The epoxy curing agent has good hydrophilic performance, good flexibility and good compatibility with epoxy resin, and when the epoxy resin coating is prepared, a paint film of the epoxy resin coating has excellent salt fog resistance, water resistance and toughness and is high in adhesive force and hardness.

Description

technical field [0001] The invention relates to an epoxy curing agent, in particular to a toughened water-based epoxy curing agent and its preparation method and application, belonging to the technical field of water-based epoxy coatings. Background technique [0002] Epoxy resin coatings have excellent adhesion, mechanical properties and chemical resistance, and are widely used in coating anticorrosion, civil engineering, adhesives and other fields. As people's requirements for environmental protection become increasingly urgent, the water-based research of epoxy coatings is an important trend in the development of coatings today. Only when the epoxy resin reacts with a suitable curing agent to form a three-dimensional network structure can it have good mechanical properties and anti-corrosion properties, so the curing agent is the key to the application value of the epoxy resin. As a water-based anti-corrosion coating, epoxy resin has common problems such as brittleness, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/50C09D163/02
CPCC08G59/5026C08G59/502C08G59/5033C08G59/504C09D163/00
Inventor 亓淑源纪学顺沈潇斌晋云全武泰恒郝宝祥
Owner WANHUA CHEM GRP CO LTD
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