Flame-retardant polyurethane hot melt adhesive and process for the production thereof

By introducing polystyrene-based flame retardants into polyurethane hot melt adhesives, the problems of insufficient flame retardancy and compatibility were solved, forming an expanded foam char layer, achieving good flame retardant effect and improved mechanical properties.

CN121227263BActive Publication Date: 2026-06-09QINGYUAN FANYI POLYURETHANE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
QINGYUAN FANYI POLYURETHANE CO LTD
Filing Date
2025-10-22
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Polyurethane hot melt adhesives have poor flame retardancy, posing safety hazards. Furthermore, traditional additive flame retardants have poor compatibility with the polyurethane resin matrix, affecting adhesion and mechanical properties.

Method used

A polystyrene-based flame retardant was prepared by polymerizing diethyl 4-vinylbenzylphosphonate and divinyltriazine monomers. This flame retardant was then added to polyurethane hot melt adhesive to form an intumescent flame retardant. It was used as an acid source, gas source, and carbon source to form an intumescent foam carbon layer that isolates oxygen and heat, thereby improving compatibility and interfacial strength.

Benefits of technology

It significantly improves the flame retardant properties of polyurethane hot melt adhesives, reduces the limiting oxygen index, and improves bond strength and mechanical properties, especially peel strength and tensile properties.

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Abstract

The present application relates to the technical field of adhesive, and discloses a kind of flame-retardant polyurethane hot melt adhesive and preparation process, the present application is added to dry polyol, tackifying resin in reaction kettle, after heating stirring, add diisocyanate in nitrogen atmosphere, stirring reaction, then add polystyrene flame retardant, catalyst, defoaming agent, antioxidant, obtain flame-retardant polyurethane hot melt adhesive.The polystyrene flame retardant contains phosphate, melamine ring and a large number of benzene ring structure, forms intumescent flame retardant, and has good flame-retardant effect.The compatibility and interfacial strength of polystyrene flame retardant and polyurethane hot melt adhesive are high, the influence of flame retardant on the mechanical properties of hot melt adhesive is reduced, and the flame retardant contains high-strength polystyrene molecular chain, which is beneficial to improve the mechanical strength of hot melt adhesive, so that the hot melt adhesive has good peel strength and tensile properties.
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