Waterproof breathable composite fabric and preparation method thereof

By using a combination of specific materials and adhesive layers in waterproof and breathable composite fabrics, the problem of hydrolysis of polyester polyurethane adhesives in high temperature and high humidity environments has been solved, achieving stability and controllable aging of the fabric during long-term storage and use, and avoiding the risk of sudden collapse.

CN122275418APending Publication Date: 2026-06-26BEIJING TIEXUE LONGYA NEW MATERIALS TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202610442559.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-07
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

When existing waterproof and breathable composite fabrics are stored for a long time in high temperature and high humidity environments, the polyester-based polyurethane adhesive is prone to hydrolysis, which leads to a decrease in interfacial bonding strength, making it unable to withstand mechanical loads, resulting in interfacial delamination and permeable tearing of the film that cannot be repaired.

Method used

The outer layer is made of ultra-high molecular weight polyethylene/polyamide 66 blended woven fabric, the inner layer is made of antibacterial polypropylene composite nonwoven fabric, the middle layer is made of polyether-polycarbonate copolymer thermoplastic polyurethane film, and the bonding layer is made of double cross-linked network polyether moisture-curing polyurethane hot melt adhesive. Combined with nanofillers and functional additives, a stable composite structure is formed.

Benefits of technology

By blocking the root cause of ester bond hydrolysis, structural weakening is prevented, ensuring that the fabric can still withstand mechanical loads after aging, and providing early visual warnings to prevent the fabric from suddenly collapsing at critical moments, thus achieving a controllable aging process throughout its entire life cycle.

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Abstract

The invention discloses a waterproof and breathable composite fabric and a preparation method thereof, belongs to the technical field of textiles, and solves the problems that the waterproof and breathable composite fabric adopting a polyester type polyurethane adhesive can be hydrolyzed and aged in long-term high-temperature and high-humidity pressed storage, the initial symptoms are hidden, and the test is easy to misjudge. And during use, the interface strength is suddenly reduced to cause sudden delamination, tearing and failure, and the product is irreversible and can only be scrapped. According to the method, the source of ester bond hydrolysis is eliminated from the aspect of material chemistry, an autocatalysis acceleration loop is blocked on a degradation path, structural weakening caused by long-term compression is prevented on stress distribution, it is ensured that mechanical loads can still be resisted after aging on interface combination, early-stage visual early warning intervention is provided on failure recognition, and the method has the advantages of being high in reliability and high in reliability. The hydrolysis reaction is converted into a full-life-cycle visible, predictable and controllable slow aging process from a symptom-free progressive failure process, so that the risk that the fabric suddenly collapses at a critical moment and cannot be repaired is avoided.
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