硬脂酸改性硅藻土及其对天然橡胶/丁苯橡胶增强性能的影响  

Surface Modification of Diatomite by Steatic Acid and It's Effects on Reinforcing for Natural Rubber/Styrene Butadiene Rubber Blend

作　　者：廖经慧[1] 杜高翔[1] 薛强[1] 丁浩[1] 

机构地区：[1]中国地质大学(北京)材料科学与工程学院,北京100083

出　　处：《硅酸盐学报》2011年第4期641-645,共5页Journal of The Chinese Ceramic Society

基　　金：中央高校基础研究基金(No.2010ZY48)资助项目

摘　　要：采用硬脂酸对硅藻土进行表面改性,将改性后的硅藻土替代白炭黑添加到天然橡胶/丁苯橡胶混合物中,研究了经硬脂酸改性的硅藻土对橡胶增强性能的影响。通过活化指数和在有机溶液中的沉降时间等测试,结合Fourier红外光谱分析对硬脂酸改性硅藻土的效果和机理进行了探讨。结果表明:硬脂酸的最佳用量为2.0%(质量分数),改性后硅藻土的活化指数为83.0%,在煤油中的沉降时间为5min,硅藻土颗粒表面呈现一定的疏水性;添加由2.0%硬脂酸改性的硅藻土后,所得橡胶制品的拉伸强度提高了14.1%,撕裂强度提高了17.8%,300%定伸应力提高了40.0%,但扯断伸长率降低了14.1%;硬脂酸与硅藻土颗粒的吸附方式为物理吸附。Diatomite was surface modified by stearic acid.The effect of modification on the reinforcement for natural rubber/styrene butadiene rubber blends（NR/SBR） was investigated by adding modified diatomite instead of amorphous silica.The activation index and sedimentation time in organic solution were examined.The mechanism of the modification was analyzed via Fourier transform infrared spectroscopy.The results indicated that the activation index of modified diatomite reached 83.0%and the sedimentation time was 5 min in kerosene when the dosage of stearic acid was 2.0%（mass fraction） of diatomite.The surface of diatomite particles after modification appeared hydrophobic to some extent.When modified diatomite with 2.0%stearic acid was used,the tensile strength, tear strength and stress at 300%elongation of NR/SBR were increased by 14.1%,17.8%and 40.0%,respectively,however,the elongation at break was decreased by 14.1%.There was a physical adsorption between stearic acid and diatomite.

关 键 词：硅藻土 硬脂酸 表面改性 天然橡胶/丁苯橡胶并用胶 增强 

分 类 号：TQ050.4[化学工程]