双螺杆挤出改性胶粉/天然橡胶并用胶的性能研究 |
Properties of Modified Rubber Powder by Twin-screw Extrusion/NR Blends |
投稿时间:2020-03-01 修订日期:2020-03-01 |
DOI:10.12136/j.issn.1000-890X.2020.11.0839 |
中文关键词: 双螺杆挤出 改性 胶粉 天然橡胶 并用胶 交联网络 挤出转速 |
英文关键词: two-screw extrusion modification rubber powder NR blend crosslinking network extrusion speed |
基金项目:国家自然科学基金资助项目(51678292;51273172) |
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中文摘要: |
采用双螺杆挤出改性胶粉,研究挤出转速对挤出改性胶粉/天然橡胶(NR)并用胶性能的影响。结果表明:采用双螺杆挤出,在强剪切力作用下,硫化胶粉的(硫化胶)交联网络结构破坏,随着挤出转速的增大,硫化胶粉的交联密度先迅速下降后趋于稳定;挤出改性胶粉与NR并用形成的“海-岛”结构随着硫化胶粉交联网络结构打开程度的增大逐渐消失,挤出改性胶粉与NR形成了共交联网络结构;硫化胶粉交联网络破坏程度适宜时,挤出改性胶粉易与NR在硫化过程中形成交联网络,并避免硫化胶粉过度降解,从而使得并用胶获得较大的拉伸强度和拉断伸长率。 |
英文摘要: |
Extruding-modified waste rubber powders(WRPs) was prepared by using two-screw extruder,and the influences of extrusion speed on the properties of WRPs/natural rubber(NR) blends were investigated. The results showed that,with the strong shear force by two-screw extruder,the crosslinking network of WRPs was wrecked. As the extrusion speed increased,the crosslinking densities of WRPs(vulcanizate) first dramatically decreased and then gradually tended to a stable value. The typical “sea-island” structure formed in the blend of extruding-modified WRPs and NR gradually disappeared according to the increasing decomposition of the WRPs’ network. A co-crosslinking network structure was formed between extruding-modified WRPs and NR.When the damage of crosslinking network of WRPs was appropriate,the crosslinking network between extruding-modified WRPs and NR was easy to form during vulcanization,and excessive degradation of WRPs was avoided,so that the WRPs/NR blends could obtain larger tensile strength and elongation at break. |
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