Polyurethane hot melt adhesive for plate edge sealing and preparation method thereof

By combining polyester polyols and isocyanates in a specific ratio, fast crystallization cross-linking points and cross-linking networks are formed, which solves the problem of insufficient initial bonding strength of polyurethane hot melt adhesives at high temperatures, and achieves high initial bonding strength and flexibility in high temperature environments, making it suitable for furniture edge sealing.

CN120665557APending Publication Date: 2025-09-19GUANGDONG CONFETTI NEW MATERIALS TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202510858758.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-25
Publication Date
2025-09-19

AI Technical Summary

Technical Problem

The initial bonding strength of existing polyurethane hot melt adhesives decreases under high temperature environments, making it difficult to meet the needs of rapid bonding in automated production, especially in furniture manufacturing where edge banding strips are prone to rebound during the edge banding process.

Method used

A specific ratio of crystalline and amorphous polyester polyols, thermoplastic resins and isocyanates is used to form fast crystallization cross-linking points and cross-linking networks by controlling the reaction process, thereby improving the initial bonding strength at high temperatures.

Benefits of technology

The initial bonding strength is greater than 18N/cm at 40°C, and the peel strength is greater than 98N/cm after 24 hours. It is suitable for edge banding of panels in high temperature environments, provides high initial bonding strength and flexibility, and is suitable for edge banding of furniture.

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Abstract

The invention relates to the technical field of polyurethane hot melt adhesives, in particular to a polyurethane hot melt adhesive for plate edge banding and a preparation method thereof.The polyurethane hot melt adhesive is prepared from, by weight, 10%-40% of crystalline polyester polyol, 10%-40% of amorphous polyester polyol, 1%-10% of polyether polyol, 5%-30% of thermoplastic resin, 5%-30% of filler, 5%-20% of isocyanate and the balance auxiliaries; the isocyanate comprises first isocyanate and second diisocyanate, and each of the first isocyanate and the second diisocyanate comprises one or more of diphenylmethane diisocyanate, toluene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate and hexamethylene diisocyanate. According to the polyurethane hot melt adhesive disclosed by the invention, the types, the dosage and the adding mode of the first isocyanate and the second isocyanate are controlled, and the prepared polyurethane hot melt adhesive keeps high initial adhesion strength at 40 DEG C and is suitable for being used for sealing edges of plates in a high-temperature environment.
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