A polybutadiene-based polyurethane-modified epoxy resin adhesive and a preparation method thereof

By developing a method for preparing polybutadiene-based polyurethane-modified epoxy resin, the problems of high brittleness, easy breakage, and difficulty in room temperature curing of epoxy resin have been solved. This method has resulted in an adhesive with high toughness and convenient construction, suitable for high-load environments, and extends the service life of the material.

CN122278427APending Publication Date: 2026-06-26CHINA SHIPBUILDING INDUSTRY CORPORATION NO725 RESEARCH INSTITUTE
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA SHIPBUILDING INDUSTRY CORPORATION NO725 RESEARCH INSTITUTE
Filing Date
2026-04-27
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing epoxy resin adhesives are brittle, easily broken, and difficult to cure at room temperature, which limits their application in high-load scenarios such as aerospace, marine, and polar environments.

Method used

A polybutadiene-based polyurethane-modified epoxy resin was prepared by synthesizing a polyurethane prepolymer at 40-80℃, and then adding a curing agent at room temperature for stirring and curing to form an adhesive with both high toughness and good tensile strength.

Benefits of technology

It achieves curing at room temperature, improves the ease of application and toughness of the adhesive, maintains good tensile strength, is suitable for high-load scenarios, extends the service life of bonded components, and saves human and material resources.

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Abstract

This invention provides a polybutadiene-based polyurethane-modified epoxy resin adhesive and its preparation method. The preparation method includes the following steps: Step 1, drying the polyol and isocyanate; Step 2, adding the dried polyol, dried isocyanate, and a portion of the catalyst at 40-80°C, and stirring to obtain an -NCO-terminated polyurethane prepolymer; Step 3, dissolving the epoxy resin in a solvent, then slowly adding it to the -NCO-terminated polyurethane prepolymer, and adding the remaining catalyst while stirring; Step 4, adding a curing agent at room temperature and stirring; Step 5, curing at room temperature for 24-48 hours. The polyol includes at least hydroxyl-terminated polybutadiene. By selecting the components, the compatibility between polyurethane and epoxy resin can be improved. The modified epoxy resin possesses both toughness and good tensile strength. This combination of rigidity and flexibility helps reduce the frequency of coating repairs and significantly extends the service life of the bonded components.
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Citation Information

Patent Citations

  • Polyurethane modified epoxy resin adhesive and preparation method thereof

    CN116285831A

  • Amino-terminated polyurethane modified epoxy resin

    CN120173245A