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Waterborne Polyurethane Reinforced with SiO2-Modified TiO2: Enhanced Mechanical Properties and Retained Hydrostatic
Shuyi Wang1, Weiping Yao2, Xia Lin2
1College of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China.
Polymers
|June 26, 2026
Summary
This study enhances pongee fabric
Area of Science:
- Materials Science
- Textile Engineering
- Polymer Chemistry
Background:
- Traditional pongee fabrics lack sufficient hydrostatic pressure resistance for extreme wet conditions, limiting their use in technical apparel.
- Functional textiles require enhanced waterproofness, moisture permeability, and mechanical robustness for applications like sportswear and medical protection.
- Existing pongee limitations necessitate innovative coating solutions to improve performance in demanding environments.
Purpose of the Study:
- To develop a modified waterborne polyurethane (WPU) coating for pongee substrates.
- To enhance hydrostatic pressure resistance, mechanical properties, and UV absorption of functional textiles.
- To create durable, high-performance coated fabrics suitable for outdoor sportswear and medical applications.
Main Methods:
- Fabrication of silica-modified titania particles (SiO2/TiO2) using a sol-gel method.
- Physical blending of SiO2/TiO2 particles with a modified anionic WPU system incorporating a polyester-type modifier A.
- Application of the composite coating onto pongee substrates and performance evaluation.
Main Results:
- Modifier A significantly improved hydrostatic pressure resistance and maintained high elongation at break in the WPU system.
- Optimal comprehensive performance achieved at 0.2 wt% SiO2/TiO2 loading, showing superior mechanical properties and static water contact angles >100°.
- Coated fabrics, particularly 380T polyester taffeta, demonstrated substantially improved and wash-fast hydrostatic pressure resistance.
Conclusions:
- The developed SiO2/TiO2 composite WPU coating effectively enhances the hydrostatic pressure resistance and durability of pongee fabrics.
- The coating provides a balance of mechanical strength, water repellency, and UV absorption for functional textiles.
- This technology offers practical applicability for high-performance textiles in demanding environments, with excellent wash fastness.
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