A bio-based acrylate-modified polyurethane hot melt adhesive and a method of making the same

By specifically combining components such as bio-based polyol oligomers, a bio-based acrylate-modified polyurethane hot melt adhesive with fast curing speed, high bonding strength, and good impact resistance is prepared. This solves the shortcomings of existing bio-based polyurethane hot melt adhesives, expands the application scenarios to opaque substrates, and meets the needs of multiple fields.

CN117757409BActive Publication Date: 2026-07-03XIAMEN WELDTONE TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIAMEN WELDTONE TECH CO LTD
Filing Date
2023-12-22
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing bio-based polyurethane hot melt adhesives have shortcomings in terms of curing speed, bonding strength, chemical corrosion resistance, and impact resistance. Furthermore, acrylate-modified polyurethane hot melt adhesives are limited in their application on opaque substrates due to their poor flexibility and tendency to delaminate.

Method used

Bio-based acrylate-modified polyurethane hot melt adhesives are prepared by combining bio-based polyol oligomers, polyisocyanate compounds, bio-based polycarbonate-type polyurethane acrylate prepolymers, bio-based acrylate monomers, photoinitiators, rheology modifiers, silane coupling agents, water-absorbing agents, and catalysts in specific proportions. The glass transition temperature and component content are controlled to improve curing speed and bonding strength, and enhance impact resistance and chemical corrosion resistance.

Benefits of technology

This invention achieves a bio-based acrylate-modified polyurethane hot melt adhesive with fast curing speed, high bonding strength, good impact resistance, and chemical corrosion resistance. It is suitable for automotive, new energy, consumer electronics, woodworking and textile fields, expanding the application scenarios to opaque substrates.

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Abstract

The bio-based acrylate modified polyurethane hot melt adhesive contains a bio-based polyol oligomer, a polyisocyanate compound, a bio-based polyurethane acrylate prepolymer, a bio-based acrylate monomer, a photoinitiator, a rheological modifier, a silane coupling agent, a water absorbent and a catalyst. Based on the total mass of the bio-based acrylate modified polyurethane hot melt adhesive, the content of the bio-based polyurethane acrylate prepolymer is 15-25 wt%, the content of the bio-based acrylate monomer is 5-15 wt%, and the glass transition temperature of the bio-based acrylate monomer is 45-110 DEG C. The key of the present application is to introduce bio-based polyurethane acrylate prepolymer and bio-based acrylate monomer with specific content, and to obtain bio-based acrylate modified polyurethane hot melt adhesive by synergistic cooperation with other raw materials. The bio-based acrylate modified polyurethane hot melt adhesive has the advantages of fast curing speed, high bonding strength, good impact resistance, chemical corrosion resistance, suitable open time and wide applicability.
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