硅藻土改性聚氨酯涂层的制备及性能%Preparation and properties of diatomite-modified polyurethane coating
国电电力广东新能源开发有限公司,广东 珠海 519002 河南省科学院,河南 郑州 450046;河南省科学院化学研究所,河南 郑州 450002
2026-03-05
聚氨酯涂层 硅藻土 改性 耐盐雾腐蚀 抗紫外老化
[目的]聚氨酯涂料具有优异的防腐性能,然而其抗紫外老化能力不佳,影响长期耐久性.[方法]通过原位合成法,成功将硅藻土纳米粒子均匀分散于聚氨酯基体中,制备了硅藻土/聚氨酯复合涂层.利用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射(XRD)等手段对复合涂层的微观结构和化学组成进行了表征.[结果]30%硅藻土的引入显著提高了聚氨酯涂层的耐盐雾、耐紫外性能和硬度.在 500 h的紫外线照射下,复合涂层的光泽度降低率从纯聚氨酯涂层的 19.4%降低到 10.3%,耐盐雾腐蚀时间从58 d延长至68 d.硅藻土改性聚氨酯涂层的铅笔硬度可达到3H.[结论]该硅藻土改性聚氨酯涂层在防腐蚀领域具有良好的应用前景.%[Objective]Polyurethane coatings exhibit excellent corrosion resistance,yet their susceptibility to ultraviolet-induced degradation compromises long-term protective performance.[Method]Diatomite nanoparticles were uniformly dispersed in a polyurethane matrix via in-situ synthesis,successfully fabricating polyurethane/diatomite composite coatings.The microstructure and chemical composition of the composite coatings were characterized by scanning electron microscopy(SEM),energy-dispersive spectroscopy(EDS),and X-ray diffraction(XRD).[Result]The incorporation of 30%diatomite significantly improved the salt spray resistance,ultraviolet resistance,hardness of the polyurethane coating.After 500 hours of violent irradiation,the glossiness reduction rate was decreased from 19.4%for the pure polyurethane coating to 10.3%for the composite coating.The salt spray corrosion resistance was extended from 58 days to 68 days.The pencil hardness of the diatomite-modified polyurethane coating reached 3H.[Conclusion]The diatomite-modified polyurethane coating reported in this paper demonstrates promising application potential in the field of corrosion protection.
