| 炭黑在低硬度天然橡胶/顺丁橡胶并用胶中的偏析 |
| Non-uniform Distribution of Carbon Black in Low Hardness NR/BR Blends |
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| DOI： |
| 中文关键词: 天然橡胶 顺丁橡胶 并用胶 炭黑偏析 损耗因子 混炼工艺 |
| 英文关键词: NR BR blend carbon black segregation loss factor mixing procedure |
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| 中文摘要: |
| 采用动态力学分析（DMA）和电子显微镜等方法研究炭黑N550在低硬度天然橡胶（NR）/顺丁橡胶（BR）（用量比50/50）并用胶中的偏析行为，并考察混炼工艺对炭黑偏析的影响。结果表明，损耗因子峰高随炭黑用量的增大而线性下降，可用来定量表征炭黑在橡胶中的含量。当NR与BR的门尼粘度接近时，NR/BR并用胶的DMA温度谱图中出现2个玻璃化温度峰，且峰温与NR和BR一致，表明NR与BR以50/50并用时是不相容的。炭黑N550更易偏析在BR相中，采用NR+炭黑混炼工艺时，炭黑的分布最均匀，偏析最弱。 |
| 英文摘要: |
| The non-uniform distribution of carbon black N550 in the low hardness NR/BR compound with a blending ratio of 50/50 was studied by using dynamic mechanical analysis（DMA）and transmission electric microscopy（TEM），and the effect of mixing procedure on the distribution of carbon black was investigated.The results showed that，the peak value of tanδ decreased linearly with the increase of the addition level of carbon black，which could be used to calculate the carbon black distribution in each phase of NR/BR blend.When the Mooney viscosity values of NR and BR were similar，there were two Tg peaks in the DMA curves of NR/BR blend located exactly at the peaks of NR and BR respectively，which indicated that NR and BR were immiscible.It was found that carbon black N550 was more affinity to BR，and when all carbon black was premixed with NR，better distribution of carbon black in the NR/BR blends was obtained comparing with other mixing procedures，which could reduce the non-uniform distribution of carbon black. |
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