| 湿法制备硅土/白炭黑/天然橡胶复合材料及性能 |
| Properties of silica / siliceous earth / natural rubber composites by latex coagulation process |
| 投稿时间：2017-08-17 修订日期：2017-08-17 |
| DOI： |
| 中文关键词: 硅土 白炭黑 乳液共混法 天然橡胶 性能 |
| 英文关键词: Siliceous earth Silica, latex coagulation process Natural rubber Properties |
| 基金项目:广东省自然科学基金项目（2016A030307020）；湛江市科技计划项目（201502021）；大学生创新创业训练计划项目（201510579304），公益性行业（农业）科研专项（201403066）。 |
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| 中文摘要: |
| 分别制备改性白炭黑和硅土悬浮液，然后与天然胶乳混合，得到白炭黑和硅土天然橡胶母炼胶。在混炼阶段将两种母炼胶按不同比例混合，得到一系列总填料份数为40 phr的混炼胶。硫化特性测试结果表明：当白炭黑中加入一定量硅土时，有利于改善NR硫化初期的流动性，硫化速率增大。RPA测试结果表明：在白炭黑中加入一定量的硅土，能显著提高填料在天然橡胶基体中的分散性，payne效应明显下降。加入硅土后硫化胶的tanδ均低于白炭黑，滚动阻力下降。物理性能测试结果表明：拉伸强度、300%定伸应力、撕裂强度均随着硅土加入的份数增加而增大。白炭黑与硅土并用时的扯断伸长率明显高于单独硅土或白炭黑填充橡胶。 |
| 英文摘要: |
| Modified silica and siliceous earth suspension were prepared respectively, then mixed with natural rubber (NR) latex and silica / NR and siliceous earth / NR masterbatches were prepared. In mixing process, two kinds of masterbatches was mixed according to different ratio, a series of hybrid fillers/NR composites were gotten, and total filler loading of all samples fixed at 40 phr. The vulcanization test results show when adding a certain amount of siliceous earth, which is beneficial to enhance liquidity at the beginning stage of NR vulcanization, reduce the stiffness of the NR composites and increase curing rate. The RPA test results show that when adding a certain amount of siliceous earth in silica can improve the dispersion of fillers and the processing performance of the rubber, Payne effect reduce dramatically. Tan δ of NR vulcanization reduce obviously after adding siliceous earth which indicate rolling resistance reducing. The measure of crosslinking density show that crosslinking density of silica filled NR attend to maximum, and all hybrid filler filled NR are lower than only silica or siliceous earth filled NR. Tensile and tear performance test results show tensile strength and tear strength increased with the increment of siliceous earth loading. When silica and siliceous earth work together, the elongation at break are significantly higher than single filling silica or siliceous earth. |
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