石墨烯对聚氨酯/青铜复合涂层耐温性能的影响

Effect of graphene on the heat resistant properties of polyurethane/bronze composite coating

以青铜粉为功能颜料,聚氨酯(PU)为黏合剂,石墨烯为改性剂,采用刮涂法制备得到了石墨烯改性PU/青铜复合涂层。系统研究了热处理温度及时间对所制备涂层外观、微结构、红外发射率及附着力的影响。结果表明,石墨烯改性可提高涂层的导热和散热效果,从而可提升涂层的耐温性能。相比改性前涂层,石墨烯改性后涂层的外观、微结构、红外发射率及附着力等均具有更高的热稳定性。所制备石墨烯改性涂层在170℃下可长时间使用,在此温度下热处理100h后,涂层的外观、微结构仍然保持不变,发射率可低至0.216,附着力可保持在1级。

Graphene modified polyurethane(PU)/bronze composite coating was prepared though scraping method by using bronze powders,polyurethane and graphene as functional pigments,adhesives and modifier,respectively.The effects of heat treatment temperature and time on the appearance,microstructure,infrared emissivity and adhesion strength of the prepared coating were systematically investigated.The results show that graphene modification can improve the heat conduction and heat dissipation effects of the coating,thereby improving the heat resistance of the coating.Compared with the unmodified coating,the appearance,microstructure,infrared emissivity and adhesion strength of the coating after graphene modification have higher thermal stability.The prepared graphene modified coating can be used long-term at 170℃,after heat treatment at 170℃for 100 h.The appearance and microstructure of the coating remain unchanged,the emissivity can be as low as 0.216,and adhesion strength can be maintained at 1 grade.