碱木质素填充天然橡胶的特性研究

Characteristic of Alkali Lignin Filling Natural Rubber

研究了碱木质素填充天然橡胶的规律,考察了胶料内填料网络结构特点及其对动态力学性能的影响。通过扫描电镜(SEM)、力学性能测试和动态力学性能测试对硫化胶进行观察和分析。结果表明:填充10%~50%碱木质素时,碱木质素在天然橡胶中几乎没有填料-填料相互作用,且橡胶-填料相互作用很弱,碱木质素颗粒之间发生了团聚;碱木质素填充后胶料的力学性能没有大的降低,填充10%碱木质素时,硫化胶的拉伸强度为30 MPa,高于未填充碱木质素时的28.7 MPa;碱木质素的加入一定程度地促进了橡胶的硫化,交联密度随着碱木质素的加入而增大,当碱木质素用量达到50%时交联密度有所下降,拉伸强度未20.1 MPa;胶料的老化性能随碱木质素的加入得到改善;碱木质素的加入对硫化胶的抗湿滑性和滚动阻力没有明显影响。

The performance of alkali lignin filling natural rubber was studied. The characteristic of network structure of filler in rubber compound and its influence on dynamic mechanical properties were investigated. The vulcanizate was observed and analyzed by scanning electron microscopy （ SEM）, mechanical properties and dynamic mechanical properties test. The results showed that there was almost no filler-filler interactions in alkali lignin filled vulcanizate, the rubber-filler interactions was very weak, and the alkali lignin particles agglomerated when the filling amounts of alkali lignin were 10 %-50 %. The mechanical properties of vulcanizate were not decreased largely after filling alkali lignin. The tensile strength of 10 % alkali lignin filled vulcanizate was 30 MPa, higher than that of no alkali lignin filled sample （ 28.7 MPa）. The filling of alkali lignin partly accelerated the vulcanization of rubber. The crosslinking density was increased with the addition of alkali lignin and it decreased when the filling amount of alkali lignin was 50%, with the tensile strength of 20.1 MPa. The aging resistance was improved with the increase of the amount of alkali lignin. And there was no obvious impact on the vulcanizate＇s wet skid resistance and rolling resistance with the filling of alkali lignin.