无溶剂超支化有机硅耐高温涂层的性能

Performance of high-temperature resistant coatings from solvent-free hyperbranched organosilicon

用甲基三乙氧基硅烷、二甲基二氯硅烷和三甲基氯硅烷,采用一锅水解-缩聚法制备了无溶剂超支化有机硅树脂(HSR),利用红外光谱和硅核磁共振谱表征了化学结构.系统研究了HSR改性甲基硅树脂(SH9502)的综合性能,包括流变性、耐热性和机械性能等.结果表明:HSR的添加能显著降低HSR/SH9502共混树脂的黏度,提高其耐热性能.随着HSR添加量的增加,涂层的机械性能、阻燃、接触角等性能提高,当HSR添加量为12%(质量分数)时,制备的涂层机械性能优异且高温处理后机械性能下降不明显,同时具备优良的阻燃性能、附着力和耐水性,有望在耐高温阻燃涂料领域得到应用.

A solvent-free hyperbranched organosilicon resin(HSR)was prepared through a one-pot hydrolytic-condensation reaction using methyltriethoxysilane,dimethyldichlorosilane,and trimethylchlorosilane.The chemical structure was characterized by Fourier infrared transform spectroscopy and silicon nuclear magnetic resonance spectroscopy.The rheology,heat resistance and mechanical properties of HSR modified methyl organosilicon resin(SH9502)were systematically studied.The results showed that the addition of HSR could significantly reduce the viscosity and improve the heat resistance of HSR/SH9502 coating.With the increase of HSR content,the mechanical properties,flame retardancy,contact angle and many other properties of the coating were improved.When the content of HSR was 12%(mass fraction),the coating showed excellent mechanical properties,with no significant changes after high temperature treatment.At the same time,it showed excellent flame retardancy,adhesion and water resistance,and demonstrated great prospects in the field of high temperature flame retardant coatings.