纳米ZnO提高MDI型聚氨酯抗紫外光老化性能研究(续)  

Ultraviolet Aging Resistance of MDI-based Polyurethane Coatings Containing ZnO Nanoparticles

作　　者：牟宗波[1] 王全杰[1,2] 武文玲[1] 

机构地区：[1]陕西科技大学化学与化工学院,陕西西安710021 [2]国家制革技术研究推广中心,山东烟台264005

出　　处：《中国皮革》2013年第7期23-25,共3页China Leather

基　　金：烟台市科技攻关计划(编号:CXY09023(3));陕西科技大学研究生创新基金

摘　　要：向MDI型PU中添加偶联剂γ-氨丙基三乙氧基硅烷(KH-550)处理的纳米ZnO进行共混改性,并利用加速老化试验测试其抗UV光老化性能。粒度分析、TGA、TEM等表明,KH-550有效提高了纳米ZnO的分散性能。SEM表明,经改性后的纳米粒子在PU膜中的分散性能比未改性纳米粒子明显提高。色差、力学性能、DSC等表明,PU/ZnO纳米复合材料受UV光照射72h后,颜色变化减少,链段降解程度降低,力学性能保持率提高。但ATR-FT-IR表明UV光老化后,PU/ZnO纳米复合材料表面的基团变化与PU表面的基团变化一致。Nano-filled MDI-based polyurethane coatings were prepared by incorporation of ZnO nanoparticles treated by γ-aminopropyltriethoxysilane, and accelerated aging test was conducted. Grain-size analysis, TGA and TEM show that treated ZnO nanoparticles has better dispersion and smaller agglomeration, compared with untreated counterparts. SEM micrographs show that nano ZnO has good dispersion in the PU matrix. Colourimetry measurements, mechanical properties and thermal properties of coatings exposed to a QUV chamber for 72h were studied. The results indicate that PU/ZnO nano-composites has better UV resistance: lower color changes and degradation degree, and higher mechanical properties. However ATR-FT-IR analysis shows that changes of chain groups of PU/ZnO nano-composites are in agreement with pure PU after aging.

关 键 词：MDI型聚氨酯 纳米ZNO 光老化 降解 

分 类 号：TB383.1[一般工业技术—材料科学与工程]