勃姆石溶胶改性HGMs的制备及其水性复合涂层的性能

Preparation of boehmite sol modified HGMs and properties of water-based composite coatings

保温隔热对节能减排、减少能源消耗有着重大战略意义。本文以勃姆石溶胶对空心玻璃微球(Hollow glass microspheres,HGMs)进行表面改性,引入气腔结构以提高涂层保温隔热性能,制备可连续生产的高性能水性复合涂层。通过FTIR、XRD、SEM等表征手段对复合微球的微观形貌及结构进行分析。采用热失重分析、热导率、红外热成像等技术手段,系统研究涂层的微观结构、综合性能、保温隔热机制。结果表明:勃姆石溶胶成功对HGMs进行表面改性,HGMs@Al_(2)O_(3)保留HGMs的基本结构与特征,增强与水性聚合物基体的界面相容性,解决HGMs与水性基体界面粘结性差、致使其热导率波动大的实际问题。与未添加隔热填料的复合涂层相比,当HGMs@Al_(2)O_(3)含量为7wt%时达逾渗阈值,涂层综合性能最佳,显著提高复合涂层保温隔热性,导热系数降低58.7%;复合涂层最大热分解温度提高11%,在100℃热场环境下,能达到温度差为18.1℃的隔热效果,应用潜力及商业化前景巨大。

Thermal insulation is of great strategic importance for energy saving and emission reduction,and energy consumption.In this paper,the surface modification of hollow glass microbeads(HGMs)with boehmite sol was used to introduce the air cavity structure to improve the thermal insulation performance of the coating and to prepare a high-performance water-based composite coating that can be produced continuously.The microscopic morphology and structure of the composite microspheres were analyzed by FTIR,XRD,SEM and other characterization methods.Thermal weight loss analysis,thermal conductivity,infrared thermography and other technical means were used to systematically study the microstructure,comprehensive performance,thermal insulation and heat preservation mechanism of the coating.The results show that the surface modification of HGMs is successfully carried out by boehmite sol,and HGMs@Al_(2)O_(3) retains the basic structure and characteristics of HGMs,enhances the interfacial compatibility with the aqueous polymer matrix,and solves the practical problem of poor interfacial bonding between HGMs and the aqueous matrix,resulting in large fluctuations of its thermal conductivity.Compared with the composite coating without added thermal insulation filler,when the content of HGMs@Al_(2)O_(3) is 7wt%,it reaches the over-permeability threshold,and the comprehensive performance of the coating is the best,which significantly improves the thermal insulation of the composite coating and reduces the thermal conductivity by 58.7%.The application potential and commercialization prospect are huge.