Elastic waterproof biomimetic membrane, preparation method and application thereof

By preparing a polymer of cashew phenol siloxane cellulose and nanocellulose, the problem of insufficient waterproof performance of polyurethane finishing agents was solved, and the waterproof performance of polyurethane films and the waterproof effect of fabrics were improved.

CN121801042BActive Publication Date: 2026-07-24GUANGZHOU CAMEL HOME TEXTILE TECH CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUANGZHOU CAMEL HOME TEXTILE TECH CO LTD
Filing Date
2026-01-08
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing polyurethane finishing agents have poor waterproof performance in fabric waterproofing finishing, and traditional polyester-type polyurethane is easy to decompose when absorbing water, resulting in poor water resistance and waterproof performance.

Method used

An elastic, waterproof, biomimetic membrane was prepared by polymerizing cashew phenol siloxane cellulose with nanocellulose, polylactic acid diol, and isocyanate monomers. The strength and flexibility of the polyurethane membrane were improved by introducing benzene rings and siloxane structures through the reaction of hydroxyl groups and epoxy groups of nanocellulose.

Benefits of technology

It improves the waterproof performance and tensile strength of polyurethane membranes, enhances the waterproof performance of fabrics, and gives them good elasticity and biomimetic effects.

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Abstract

The present application relates to the technical field of polyurethane, and discloses an elastic waterproof biomimetic membrane as well as a preparation method and application thereof.The elastic waterproof biomimetic membrane is obtained by polymerization and chain extension reaction of polylactic acid dihydric alcohol, isocyanate monomer, chain extender and cashew phenol siloxane-based cellulose.The present application introduces nanocellulose containing benzene ring structure, cashew phenol flexible long carbon chain and siloxane structure into polyurethane, thereby improving the tensile strength and elongation at break of the polyurethane membrane.Meanwhile, the hydrophilicity of cellulose is reduced, the water contact angle of the polyurethane membrane is improved, and the waterproof performance is enhanced, so that the present application has good practical application in waterproof finishing of biomimetic waterproof and moisture-permeable membranes, and fabric materials such as waterproof jackets.
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