Polyurethane glue, preparation process and composite film using glue

By using modified polyurethane glue in the composite film and modifying nanoalumina and nanosilica with aminosilane coupling agent, the shortcomings of the existing composite films in oxygen and moisture resistance are solved, and the protection effect of food packaging is significantly improved.

CN119709090APending Publication Date: 2025-03-28HANGZHOU TOMORROW FLEXIBLE PACKAGING CO LTD
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Patent Information

Application Number
CN202411890214.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing composite membranes have shortcomings in oxygen and moisture resistance, and cannot effectively extend the shelf life of food and ensure their freshness and safety.

Method used

A polyurethane glue consists of components A and components B, which include polyester polyol, ferrous glycine and diphenylmethane diisocyanate, and component B includes toluene diisocyanate, aminosilane modified filler and N,N'-diisopropylcarbodiimide. The nano-alumina and nanosilica gel are modified by aminosilane coupling agent to improve their dispersion properties, thereby enhancing the oxygen and moisture resistance of the glue.

Benefits of technology

The composite membrane is improved to protect food more effectively, extend the shelf life and maintain the freshness and safety of food.

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Abstract

The invention relates to the technical field of polyurethane glue, and particularly discloses polyurethane glue, a preparation process and a composite film using the glue. The polyurethane glue is prepared from a component A and a component B. The component A is prepared from the following raw materials in parts by weight: 2 to 4 parts of polyester polyol, 0.5 to 0.9 part of trimethylolpropane, 0.05 to 0.15 part of ferrous glycinate, 3 to 7 parts of diphenylmethane diisocyanate, 35 to 45 parts of ethyl acetate and 1 to 3 parts of modified polyvinyl alcohol; the component B is prepared from the following raw materials in parts by weight: 3 to 7 parts of toluene diisocynate, 1 to 2 parts of isophthalic acid, 1 to 3 parts of amino silane modified filler, 25 to 35 parts of ethyl acetate, 0.1 to 0.2 part of N, N '-diisopropylcarbodiimide and 1 to 3 parts of isopropanol; the amino silane modified filler is prepared from the following raw materials: an amino silane coupling agent, nano aluminum oxide and nano silica gel.
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