| 交联结构对天然橡胶硫化胶高效热氧化再生的影响 |
| Effect of Crosslinking Structure on Efficient Thermal-Oxidative Regeneration of NR Vulcanizate |
| 投稿时间：2024-03-08 修订日期：2024-03-08 |
| DOI：10.12136/j.issn.1000-890X.2026.03.0163 |
| 中文关键词: 天然橡胶 交联结构 硫化体系 热氧化降解 再生橡胶 |
| 英文关键词: NR crosslinking structure vulcanization system thermal-oxidative regeneration reclaimed rubber |
| 基金项目:国家自然科学基金资助项目（52173103） |
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| 中文摘要: |
| 研究交联结构对天然橡胶（NR）硫化胶热氧化再生的影响，采用再生橡胶的溶胶含量和溶胶相对数均分子质量（Mn）表征具有不同交联结构的NR硫化胶的再生效果，分析再生过程产生的气体成分。结果表明：普通硫化体系、半有效硫化体系和有效硫化体系NR硫化胶在210 ℃下热氧化再生9 min后，其再生橡胶的溶胶含量分别为100%，69.7%和30.5%；交联键的类型是影响NR硫化胶热氧化再生的主要因素，富含多硫键的硫化胶更易被降解再生；NR硫化胶的交联密度越大，热氧化再生时间越长，NR再生橡胶的溶胶Mn越小；交联密度小且富含多硫键的普通硫化体系NR硫化胶在热氧化再生时气体释放更明显，降解程度更大。 |
| 英文摘要: |
| The effect of crosslinking structure on thermal-oxidative regeneration of natural rubber （NR） vulcanizates was studied，and the regeneration effect of NR vulcanizates with different crosslinking structures was characterized by sol content and sol number average molecular weight（Mn） of reclaimed rubber，and the gas compositions generated during the regeneration process was also analyzed.The results showed that after 9 min of thermal-oxidative regeneration at 210 ℃，the sol contents of NR reclaimed rubber from conventional vulcanization systems，semi effective vulcanization systems and effective vulcanization systems NR vulcanizates were 100%，69.7% and 30.5%，respectively.The type of crosslinking bond was the main factor affecting the thermal-oxidative regeneration of NR vulcanizates，and vulcanizates with rich multiple sulfur bonds were more easily degraded and regenerated.The higher the crosslinking density of NR vulcanizate was，the longer the thermal-oxidative regeneration time was，and the smaller the sol Mn of NR regenerated rubber was.The conventional vulcanization system NR vulcanizate with low crosslinking density and rich multiple sulfur bonds released more gas during thermal-oxidative regeneration，and the degradation degree was greater. |
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