Hot melt adhesive film for bonding pet and metal, method for preparing the same, and composite board

By using a multi-layer hot melt adhesive film with a design of maleic anhydride terpolymer and polyethylene core layer, the problems of water resistance and bonding strength of PET/metal composite boards are solved, achieving stable bonding performance and simplifying production, while avoiding the defects of liquid adhesives.

CN119799194BActive Publication Date: 2026-06-26GUANGZHOU LUSHAN NEW MATERIALS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUANGZHOU LUSHAN NEW MATERIALS
Filing Date
2025-02-19
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing liquid adhesives used for bonding PET/metal composite boards suffer from insufficient water resistance, reduced tack, and small molecule penetration issues, affecting bond strength and service life. Furthermore, the production process is complex and poses safety hazards.

Method used

The hot melt adhesive film with a multi-layer structure includes a first adhesive layer for bonding PET, a second adhesive layer for bonding metal, and a polyethylene core layer. The adhesive layers use maleic anhydride terpolymer and maleic anhydride graft polymer. It is prepared by multi-layer co-extrusion casting or co-extrusion blown film to achieve stable bonding between PET and metal.

Benefits of technology

It improves the water resistance and bonding strength of PET/metal composite boards, avoids the problem of small molecule penetration, simplifies the production process, and is environmentally friendly.

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Abstract

The present application relates to hot melt adhesive film technical field, especially to a kind of hot melt adhesive film for bonding PET and metal and its preparation method and composite board.The hot melt adhesive film includes first adhesive layer, core layer and second adhesive layer;First adhesive layer includes maleic anhydride terpolymer and maleic anhydride grafting polymer, maleic anhydride grafting polymer includes at least one of maleic anhydride grafting ethylene-acrylate copolymer and maleic anhydride grafting SEBS;In first adhesive layer, maleic anhydride terpolymer and maleic anhydride grafting polymer total proportion ≥80wt%;Second adhesive layer includes maleic anhydride grafting polyethylene;Core layer includes polyethylene;The mass ratio of first adhesive layer, core layer and second adhesive layer is (2-4) :(3-5) :(2-4).The hot melt adhesive film of the present application can realize the bonding of PET and metal plate, and has good water resistance, and the bonding performance still meets the requirements after soaking in water for 48h.
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