研制了一种应用在轨道交通内饰的水性聚氨酯砂纹面漆。研究结果表明:选择超低VOC水性羟基分散体配合低黏度高耐性水性多异氰酸酯固化剂作为主要成膜物,复配高耐磨性的砂纹粉,搭配多种流变助剂,制备的聚氨酯砂纹面漆性能优异又符合TB/T3139—2021《机车车辆非金属材料及室内空气有害物质限量》环保要求,解决了砂纹面漆施工返工件起毛刺和贮存中砂纹粉上浮的问题。

The waterborne polyurethane sand grain finish applied in rail transit interior were developmented.The results showed that when choosing ultra-low VOC waterborne hydroxyl dispersion with low viscosity and high tolerance waterborne multi-isocyanate curing agent as the main film forming material,mix with sand grain powder with high wear resistance,and mix with a variety of rheological additives,the prepared polyurethane sand grain finish had excellent performance and met the environmental requirements of the new standard TB/T 31392021 Limits of Hazardous Substances in Non-metallic Materials and Indoor Air for Locomotives and Vehicles.The problems of burr in rework and sand grain powder floating in storage were solved.