High-elasticity weather-resistant composite waterproof roll material and preparation method thereof

Bio-based polyurethane prepolymers are generated by reacting long-chain polyester glycols derived from microbial fermentation with aliphatic diisocyanates. This prepolymer is then combined with nano-silica fillers and polyester spunbond nonwoven fabric to form a sandwich structure. This solves the problem of easy photo-oxidation and chain breakage in the core layer of petroleum-based polyurethane, resulting in a composite waterproof membrane with high elasticity and high weather resistance.

CN122125975APending Publication Date: 2026-06-02SHANDONG QINGCHI WATERPROOF MATERIAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG QINGCHI WATERPROOF MATERIAL CO LTD
Filing Date
2026-04-30
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing layered composite waterproof membranes are prone to photo-oxidation and chain breakage in the petroleum-based polyurethane core layer, resulting in loss of elasticity, embrittlement and fracture, and insufficient weather resistance and mechanical properties.

Method used

A bio-based polyurethane prepolymer is generated by reacting microbial fermentation-derived long-chain polyester diol with aliphatic diisocyanate. This prepolymer is then combined with nano-silica filler and polyester spunbond nonwoven fabric, and a sandwich structure is formed through a hot-pressing process to enhance interlayer bonding and cross-linking network.

Benefits of technology

It significantly improves the long-term weather resistance and elasticity of the roll material, enhances its mechanical strength and dimensional stability, avoids photo-oxidative degradation, and strengthens interlayer bonding.

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Abstract

The application relates to the technical field of layered products, and discloses a high-elasticity weather-resistant composite waterproof roll material and a preparation method thereof. The roll material is a layered product, and sequentially comprises an upper reinforcing layer, a core layer and a lower reinforcing layer from top to bottom. The core layer is prepared from a bio-based polyurethane prepolymer prepared by reacting a microbial fermentation source long-chain polyester diol with an aliphatic diisocyanate, and is formed by thermal curing in cooperation with a chain extender, a catalyst and inorganic fillers. The long-chain polyester diol is obtained by polycondensation of a hydroxyl fatty acid monomer with a carbon chain length of ten to eighteen, and does not contain a double bond structure in the molecular chain. The application eliminates weak sites of photo-oxidative chain scission in the chain segment from the root of the molecular structure, blocks a chain scission path caused by ultraviolet rays, and maintains the elastic structure integrity of the roll material under long-term illumination.
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