Preparation method and application of self-emulsifying waterborne epoxy curing agent

By introducing rigid groups such as Y-shaped structure emulsifiers and benzene rings into the aqueous epoxy curing agent, the problems of cumbersome preparation processes and insufficient performance in the prior art are solved, and the effect of simplifying the process and improving the curing performance is achieved.

CN119708435APending Publication Date: 2025-03-28SHANGHAI XINHONGSHENG NEW MATERIAL CO LTD
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Patent Information

Application Number
CN202411455231.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-18
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing water-based epoxy curing agent preparation process is complicated and it is difficult to meet the needs of epoxy resin compatibility and cured coating performance.

Method used

Polyether monoamine, bisphenol A-type epoxy resin and bisepoxy end-group glycidyl ether were used to react to form an emulsifier with a Y-type structure, and emulsifier was added dropwise to the polyamine compound, and rigid groups such as benzene ring were introduced to prepare a self-emulsified aqueous epoxy curing agent through a solvent-free reaction system.

Benefits of technology

The preparation process is simplified, the compatibility and curing properties of the curing agent are improved, the water and chemical resistance of the coating are improved, and it is suitable for industrial anti-corrosion and water-based floor paint and other fields.

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Abstract

The invention discloses a preparation method of a self-emulsifying waterborne epoxy curing agent, which comprises the following steps: reacting polyether monoamine, bisphenol A epoxy resin and diepoxy-terminated glycidyl ether to generate an emulsifier with a Y-shaped structure, and further reacting with a polyamine compound and the bisphenol A epoxy resin to obtain the self-emulsifying waterborne epoxy curing agent. And carrying out end-capping treatment on residual primary amine in the reaction system by using single-epoxy-terminated glycidyl ether, and finally adding deionized water to disperse and adjust the solid content, thereby obtaining the self-emulsifying waterborne epoxy curing agent. In the reaction process, no organic solvent participates in the reaction, rigid groups such as benzene rings and biphenyl are introduced into a main chain structure, the water resistance of the coating can be effectively improved, and the preparation process is simple to operate, easy to control and suitable for industrial production. The water-based epoxy curing agent can directly emulsify epoxy resin, can be matched with epoxy emulsion for use, can be rapidly cured at normal temperature, has good physical properties and chemical resistance, and can be applied to the fields of water-based epoxy floor paint or industrial anti-corrosion paint and the like.
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