| 粉末NBR和超细碳酸钙填充粉末NBR硫化胶力学性能的研究* |
| Study on Mechanical Properties of Powdered NBR or Ultra-fine Calcium Carbonate-filled Powdered NBR Vulcanizates |
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| DOI： |
| 中文关键词: 粉末NBR 超细碳酸钙填充粉末NBR 力学性能 微观结构 |
| 英文关键词: powdered NBR ultra-fine calcium carbonate mechanical properties microstructure |
| 基金项目:国家自然科学基金资助项目 |
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| 中文摘要: |
| 以高分子树脂膜为包覆剂，采用凝聚共沉法制备非填充型粉末NBR和超细碳酸钙填充粉末NBR。研究了包覆剂及超细碳酸钙的用量对产物粒径及其硫化胶力学性能的影响。结果表明，当包覆剂用量为10份时，粒径≤0.9 mm的产物占99.8%，加入超细碳酸钙后可进一步减小产物的粒径；极性适宜的包覆剂及超细碳酸钙对粉末NBR 硫化胶有显著的补强作用，故非填充型粉末NBR及超细碳酸钙填充粉末NBR 均有良好的力学性能。扫描电镜分析表明，极性适宜的包覆剂与NBR 有一定的相容性，并以粒径约0.5 μm的微粒均匀分布于NBR基体中；超细碳酸钙则以原生粒子和粒径≤0.5 μm的团粒存在，它在粉末NBR中的分散性比块状NBR/超细碳酸钙混炼体系有显著改善。 |
| 英文摘要: |
| The powdered NBR and ultra-fine calcium carbonate-filled powdered NBR were prepared with coacervation-coprecipitation method by using polymeric resin as encapsulant.The influence of the encapsulant and ultra-fine calcium carbonate levels on the particle size of product and the mechanical properties of vulcanizate was investigated.The results showed that the particle size of product would be decreased further by the addition of ultra-fine calcium carbonate if 10 phr of encapsulant was used and the product with particle diameter ≤0.9 mm accounted for 99.8%；both unfilled powdered NBR vulcanizate and ultra-fine calcium carbonate-filled powdered NBR vulcanizate gave good mechanical properties because the encapsulant with suitable polarity and the ultra-fine calcium carbonate had
the significant reinforcing effect on the powdered NBR vulcanizate.It was found by SEM that the encapsulant with high polarity was compatible to NBR and dispersed uniformly in NBR matrix in the form of microparticles with diameter equal to 0.5 μm；the ultra-fine calcium carbonate was available in the form of primary particles or aggregates with diameter ≤0.5 μm and its dispersion in powdered NBR was much better than that in bale NBR/ultra-fine calcium carbonate mix. |
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