以浓硫酸为原料合成硅橡胶用白炭黑,研究了反应温度和反应时间对白炭黑吸油值、堆积密度、和中位径的影响.研究发现:随着反应时间的延长吸油值先增大后减小,堆积密度先减小后增大,中位径先减小后增大.随着反应温度的提高,吸油值先增大后减小,堆积密度先减小后增大,中位径逐渐减小.通过对这些实验因素进行综合分析优化,确定最佳反应温度为85 ℃,反应时间为25 min,制备了适合硅橡胶补强用的白炭黑.
In the reaction process of silica by oil of vitriol precipitation, oil-absorbed value, bulk density, size of amorphous silica were studied by reaction time and reaction temperature. The result shows that with the increasing of the reaction time, the oil-absorbed value increased first and decreased then, bulk density decreased first and increased then, the size of amorphous silica decreased first and increased then. With the increasing of reaction temperature, the oi-absorbed value increased first and decreased then, bulk density decreased first and increased then, the size of amorphous silica gradually decreased. Through the comprehensive analysis of factors, the best reaction temperature is 85 ℃, the best reaction time is 20 min. Silica is prepared for rubber reinforcement.
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