The surfaces of potassium hexatitanate whiskers (PTW) were modified with silane coupling agent (KH570), and the thermal insulation coil coating were prepared through adding modified PTW into saturated polyester resin system with hexamethoxymethyl melamine type resin as curing agent. The effects of the silane coupling agent dosage, the hydrolysis conditions of the silane coupling agent and the content of PTW in coatings on the thermal insulation performance of coil coating were investigated. At the same time, the scanning electron microscopy (SEM) was used to characterize the dispersion of PTW in coatings. The analysis results show that the silane coupling agent is effective for well dispersion of PTW in coil coating matrix. It was found that, when the pH value of the hydrolysis solution for KH570 hydrolysis is 1.5 and the dosage of the silane coupling agent is 5％(wt) of PTW, the best dispersion of PTW in coatings can be obtained. The introduction of the PTW modified with silane coupling agent can increase the heat reflectivity of coil coatings from 41.0％ to 68.9％ without reducing the mechanic behaviors of the coil coating.%用硅烷偶联剂对六钛酸钾晶须进行表面处理,再加入到饱和聚酯卷材涂料中以期得到隔热性能优良的隔热卷材涂料.考察了硅烷偶联剂用量、水解条件及六钛酸钾晶须用量对卷材涂料隔热性能的影响.采用SEM分析对涂膜表面六钛酸钾晶须分散状态进行了分析表征.结果表明,硅烷偶联剂表面处理能够实现六钛酸钾晶须在涂膜中的均匀分散,最优的处理工艺为:硅烷偶联剂水解液pH值为1.5,硅烷偶联剂用量为晶须用量的5%(wt).综合卷材涂料的隔热性能和机械性能,得出六钛酸钾晶须的最优添加量为1.5%(wt).六钛酸钾晶须的加入将卷材涂料的热反射率从41.0%提高到68.9%,达到良好隔热效果,此时涂层机械性能达到预涂金属卷材使用要求.
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