白炭黑的功能化改性及其改性橡胶基复合材料的制备与表征

发布时间：2018-05-25 17:29

  本文选题：白炭黑 + 天然橡胶　； 参考：《复合材料学报》2017年01期

【摘要】：利用沉淀法白炭黑生产工艺,在相同的条件下,选用不同质量分数的羟基羧酸酯作为改性剂进行湿法改性,研究了白炭黑/天然橡胶(NR)复合橡胶的力学性能、动态性能以及动态生热性能。结果表明:制备的白炭黑均为非晶态白炭黑,采用质量分数为6%的羟基羧酸酯改性的白炭黑,其分散性好,颗粒分布均匀,呈近球状,经羟基羧酸酯改性后的白炭黑有效的去除了部分亲水基团,改善了其在NR中的分散性。随着白炭黑用量的增加,分散性变差,损耗因子和动态温升均有所提高,Payne效应增大。当白炭黑用量达到临界值(白炭黑与NR质量比为40∶100)时,白炭黑/NR复合材料表现出较好的性能,改性白炭黑/NR复合材料比未改性白炭黑/NR复合材料的硬度、拉伸强度、断裂伸长率有所提高,而磨耗体积和动态生热则有所下降。动态力学性能测试结果表明,改性白炭黑与天然橡胶的质量比为40∶100时,改性白炭黑/NR复合材料的60℃滚动阻力损耗因子由0.123降到0.104。SEM结果表明,改性白炭黑在橡胶基体中的分散性优于未改性白炭黑,与NR基体界面结合的更加紧密。
[Abstract]:The mechanical properties of silica / natural rubber (NR) composite rubber were studied by wet modification of hydroxyl carboxylate with different mass fraction under the same conditions. Dynamic performance and dynamic heat generation performance. The results show that the silica prepared is amorphous silica. The silica modified by 6% hydroxyl carboxylic acid ester has good dispersion, uniform particle distribution and near spherical shape. The silica modified by hydroxyl carboxylate effectively removed some hydrophilic groups and improved its dispersity in NR. With the increase of the amount of silica, the dispersion becomes worse, the loss factor and dynamic temperature rise increase, and the Payne effect increases. When the amount of silica reached the critical value (the mass ratio of silica to NR is 40: 100), the ratio of silica to NR is 40: 100, and the modified silica / NR composite shows better properties than the unmodified silica / NR composite, and the hardness and tensile strength of the modified silica / NR composite is higher than that of the unmodified silica / NR composite. The elongation at break increases, while the wear volume and dynamic heat generation decrease. The dynamic mechanical properties test results show that when the mass ratio of modified silica to natural rubber is 40: 100, the rolling resistance loss factor of modified silica / NR composite decreases from 0.123 to 0.104.SEM. The dispersion of modified silica in rubber matrix is better than that of unmodified silica, and the interface between modified silica and NR matrix is closer.
【作者单位】： 沈阳化工大学材料科学与工程学院;
【基金】：国家自然科学基金(51173110,515473098)
【分类号】：TB332
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本文编号：1934063