高接枝率填料基防老剂对丁苯橡胶的抗氧化作用

Antioxidative effect of high grafting efficiency filler based antioxidant on styrene-butadiene rubber

以正硅酸乙酯为原料,在碱性条件下水解制得硅酸齐聚物,通过硅烷偶联剂KH 560使其与防老剂4010 NA的中间体对苯基二胺进行接枝反应,通过缩聚获得最终产物沉淀白炭黑接枝防老剂P-RT。傅里叶变换红外光谱分析结果表明对苯基二胺已接枝到白炭黑表面,热重分析结果显示了溶胶接枝法的高接枝效率。所接枝的防老剂分子具有与传统表面改性剂相同的表面修饰作用,氧化诱导期测试结果显示P-RT比传统小分子防老剂4010 NA对于丁苯橡胶具有更好的抗氧化作用和抗迁移性。

Tetraethoxysilane-40 （TEOS） was hy- drolyzed in an alkaline environment to prepare silicic acid oligomers. Then the silicic acid oligomers was grafted with 4-aminodiphenylamine （RT） which was the intermediate of antioxidant 4010 NA （AO） via silane coupling agent KH 560, thus preparing the precipitated-silica based antioxidant （P-RT） by con- densation polymerization. Fourier transform-infrared spectroscopy test demonstrated that RT was success- fully grafted onto the surface of precipitated silica.Thermogravimetric analysis results exhibited that the high grafting efficiency of this sol-grafting method. The grafted antioxidant groups played the same role as the traditional surface modifier. Oxidation induc- tion time tests revealed that P-RT possessed better anti-oxidative and anti-migratory efficiency than that of the corresponding low molecular counterpart 4010 NA.