Bisphenol A epoxy-polyether amine composite matte electrophoretic paint emulsion and preparation method thereof

By using E-51 epoxy resin and bisphenol A polyoxyethylene ether as the matrix framework in matte photocoating emulsion, combined with a blocked crosslinking agent and modified graphene predispersant, the problem of uneven coating during storage of matte photocoating emulsion was solved, achieving uniform internal matting and high penetration, and improving the coating's salt spray resistance and gloss stability.

CN122278302APending Publication Date: 2026-06-26ANHUI JINGTU NEW MATERIALS CO LTD
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Patent Information

Application Number
CN202610531285.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-21
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing matte electrophoretic emulsions are prone to causing thinner coatings and higher gloss in the interior or recessed areas of the workpiece during storage, resulting in unstable coating gloss. Furthermore, the introduction of matting powder reduces the electrophoretic coating's penetration power.

Method used

Using E-51 epoxy resin, bisphenol A, and bisphenol A polyoxyethylene ether as the matrix framework, an epoxy equivalent prepolymer is obtained by chain extension catalyzed by benzylamine. This prepolymer is then reacted with toluene diisocyanate to form a blocked crosslinking agent, which is then deblocked and participates in crosslinking during the high-temperature curing stage to form a microphase separation structure. Simultaneously, glycidyl methacrylate is introduced for photosensitive grafting modification, and a modified graphene predispersant is added to form a physical shielding network, achieving uniform internal extinction effect and high phoretic permeability.

Benefits of technology

Without adding matting powder, uniform internal matting of the coating was achieved, avoiding storage sedimentation problems, maintaining high penetration, and improving the coating's salt spray resistance and gloss uniformity through a dual curing mechanism of UV pre-curing and thermal curing.

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Abstract

The invention relates to the technical field of water-based cathode electrophoretic paint, and particularly discloses bisphenol A epoxy-polyether amine composite matte electrophoretic paint emulsion and a preparation method thereof. The bisphenol A epoxy-polyether amine composite matte electrophoretic paint emulsion is prepared from the following raw materials in parts by weight: 30 to 40 parts of E-51 epoxy resin, 8 to 10 parts of bisphenol A, 9 to 11 parts of bisphenol A polyoxyethylene ether, 0.08 to 0.12 part of benzylamine, 2.5 to 3.5 parts of methyl monoethanolamine, 0.8 to 1.2 parts of diglycolamine and 2.5 to 3.5 parts of ketimine. E-51 epoxy resin, bisphenol A and bisphenol A polyoxyethylene ether are adopted as a matrix framework, a prepolymer with the epoxy equivalent is obtained after benzylamine catalytic chain extension, and meanwhile, toluene diisocynate reacts with diethylene glycol monobutyl ether, diethylene glycol ethyl ether and trimethylolpropane polyoxyethylene ether to prepare the closed type cross-linking agent. Therefore, a uniform internal extinction effect is realized under the condition that no extinction powder is added.
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