UV-resistant, highly adhesive polyurethane coating thanks to tannin complexes
单宁复合物可大幅度提升聚氨酯涂料系统的耐UV性及粘性
A Chinese research team has modified water-based polyurethane coatings with tannic acid metal complexes. The result: significantly improved UV resistance and adhesion – even after over 1,600 hours of artificial weathering.
一个中国研究组利用单宁酸金属复合物,成功改性了水性聚氨酯涂料,显著提高该涂料的抗UV性和附着力,且能耐超过1600小时的人工风化.
Tannic acid-metal complexes protect water-based PU coatings against UV-induced ageing.
图:单宁酸-金属复合物保护水性PU涂层免受UV诱导老化。
Water-based polyurethanes (WPU) are widely used due to their environmental friendliness and weather resistance – but they often show cracking and embrittlement under prolonged exposure to UV radiation. To counteract this, researchers from China have presented an innovative process to improve UV stability: the chemical integration of tannic acid-metal complexes into the PU polymer chain by means of in situ polymerisation.
The tannic acid complexes used, in particular with titanium metal (TATi), are characterised by strong UV absorption and thus effectively protect the polymer matrix from light-induced ageing. In UV ageing tests over 1,656 hours, the surface structure of the coating remained intact – the mechanical properties showed no loss whatsoever.
水性聚氨酯（WPU）因其环保性和耐候性而被广泛使用.但如果长时间暴露于UV辐射下，将会出现开裂和脆化.为解决这个问题,中国研究人员提出一种创新的工艺,通过原位聚合的方式将单宁酸-金属复合物化学整合到PU聚合物链中,来提高UV稳定性.
研究表明:单宁酸与金属,特别是与钛金属（TATi）结合,具备强UV吸收性,能有效保护聚合物基质免受光诱导老化.在超过1,656小时的UV老化测试中,涂层的表面结构保持完整,且机械性能没有任何损失。
Sustainable raw materials, strong performance
In addition to the increased UV stability, the coatings also impressed with their high adhesive strength and water resistance. The results emphasize the potential of plant-based additives to improve the performance of water-based PU systems. Tannic acid, a natural polyphenolic substance, offers an environmentally friendly alternative to synthetic light stabilisers thanks to its complex-forming properties.
The method presented opens up new ways of developing functional bio-additive systems in sustainable coating formulations – especially for applications with high requirements for outdoor resistance and adhesion.
可持续性原料,提供超强表现力
除了提高UV稳定性外,该涂料还具有高粘合强度和耐水性。研究结果强调了植物性添加剂在改善水性聚氨酯体系性能方面的潜力.单宁酸是一种天然的多酚类物质,由于其复杂的形成特性,是合成光稳定剂的一种环保替代品。
研究人员们提出的方法,开辟了在可持续涂料配方中开发功能性生物基添加剂系统的新途径,因此特别适合有高户外耐受性和附着力要求的应用。
备注:
本文章原文来自欧洲涂料网站:
https://www.european-coatings.com/news/coatings-technologies/uv-resistant-highly-adhesive-polyurethane-coating-thanks-to-tannin-complexes/
最初发布时间:09.05.2025
参考文献来源:Progress in Organic Coatings, Volume 200, March 2025, Article 109025
图片来源:Sergey - stock.adobe.com
翻译为广州九维提供. |
