Waterborne epoxy resin emulsifier and waterborne epoxy resin composition

The use of recycled PET with a benzene ring structure in epoxy resin emulsifiers addresses uneven emulsification and stability issues, enabling stable emulsification of high-molecular-weight epoxy resins with improved storage and mechanical properties.

TW202631782AActive Publication Date: 2026-08-01CPC CORPORATION
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Patent Information

Application Number
TW114102528
Authority / Receiving Office
TW · TW
Patent Type
Applications
Current Assignee / Owner
Filing Date
2025-01-21
Publication Date
2026-08-01
Estimated Expiration
2045-01-20

AI Technical Summary

Technical Problem

Existing waterborne epoxy resins suffer from uneven emulsification, agglomeration, and low storage stability due to the use of emulsifiers with active hydrogen groups that react with epoxy functional groups, limiting their application to low epoxy equivalent weight resins and low solid content, and there is a lack of suitable emulsifiers for high-molecular-weight epoxy resins.

Method used

Aqueous epoxy resin emulsifiers are developed using recycled polyethylene terephthalate (PET) with a benzene ring structure and reactive epoxy groups, formed through chemical depolymerization and modification, which react with epoxy resins to create stable emulsions suitable for high-molecular-weight epoxy resins and high solid content.

Benefits of technology

The new emulsifiers achieve stable emulsification of high-molecular-weight epoxy resins with particle sizes below 500 nm, ensuring good coating storage stability and mechanical properties even at high solids content, addressing the limitations of previous emulsifiers.

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Abstract

A waterborne epoxy resin emulsifier, the molecular structure thereof comprises: a structure derived from a first compound; and a structure derived from an epoxy resin, wherein the molecular structure of the first compound comprises a benzene ring and a dibasic carboxyl group, wherein the molecular structure of the epoxy resin comprises two or more epoxy groups, wherein the waterborne epoxy resin emulsifier is prepared by reacting the first compound with the epoxy resin, wherein the first compound is prepared by subjecting a diester containing a benzene ring structure to an esterification reaction with polyethylene glycol, and then reacting with an acid anhydride compound capable of forming a dibasic carboxyl group. The waterborne epoxy resin emulsifier of the present invention is suitable for emulsifying oil-based epoxy resin into a water phase. The present invention also relates to a waterborne epoxy resin composition.
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