碳酸钙形貌对室温硫化硅橡胶流变学及力学性能的影响
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摘要
考察了4种不同形貌的碳酸钙对双组分室温硫化(RTV-2)硅橡胶流变学及力学性能的影响。研究发现:碳酸钙原生粒径及二次粒径越小,所制备的A组分具有较大的稠度值及挤出性;形貌为球状或立方体状的碳酸钙填充的A组分在受到较强结构破坏后能够较快地恢复到起始的状态。从力学性能对比可以看出,原生粒径及二次粒径越小所制得的RTV-2具有更优异的力学性能;同时,粉料形貌在一定程度上也会影响最终密封胶的力学性能。
The article studies the influences of 4 types of calcium carbonate with different morphologies on the rheological and mechanical properties of double-component room temperature vulcanized(RTV-2) silicone rubber. Results show: the smaller the primary particle size and secondary particle size are, the higher consistency value and extrusion property the prepared A component will have; after suffered from serious structural damages, the A component filled with globular or cubical calcium carbonate can recover to its initiative state faster. The mechanical property comparison reveals that the RTV-2 prepared with smaller sizes of primary particle and secondary particle possesses more excellent mechanical property;meanwhile the morphology of powder material will also affect the mechanical property of the final sealant to some extent.
The article studies the influences of 4 types of calcium carbonate with different morphologies on the rheological and mechanical properties of double-component room temperature vulcanized(RTV-2) silicone rubber. Results show: the smaller the primary particle size and secondary particle size are, the higher consistency value and extrusion property the prepared A component will have; after suffered from serious structural damages, the A component filled with globular or cubical calcium carbonate can recover to its initiative state faster. The mechanical property comparison reveals that the RTV-2 prepared with smaller sizes of primary particle and secondary particle possesses more excellent mechanical property;meanwhile the morphology of powder material will also affect the mechanical property of the final sealant to some extent.
引文
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[3]王永周,陈美,曾宗强.纳米碳酸钙表面改性研究进展[J].广东化工,2008,35(10):42-45.
[4]罗穗莲,潘慧铭,王跃林.硅烷偶联剂改性碳酸钙对室温硫化硅橡胶密封胶的性能影响[J].中国胶粘剂,2008,17(9):35-37.
[5]王天强,李冈效,王腾腾,等.纳米活性碳酸钙对室温硫化硅橡胶补强作用研究[J].有机硅材料,2017,31(3):154-159.
[6]刘飞,邹百军,魏林涛,等.纳米碳酸钙二次粒径对有机硅密封胶力学性能的影响[J].有机硅材料,2012,26(5):328-331.
[7] Polmanteer K E. Current Perspectives on Silicone Rubber Technology[J]. Rubber Chemistry and Technology,1981,54(5):1 051-1 080.
[8]赵保螟,陈欣,马玉录,等.碳酸钙分散效果对LLDPE/CaCO3复合材料流变行为的影响[J].塑料,2015,44(2):72-75.
[9]成局正.立方纳米碳酸钙制备及其流变性能研究[D].上海:华东理工大学,2012.
[10]胡丽丽,强飞,汤龙程,等.气相纳米碳纤维填充硅橡胶的流变行为与性能研究[J].杭州师范大学学报,2016,15(6):565-569.
[11]胡洪国.超细SiO 2增强聚硅氧烷特种有机硅密封材料形态机构与动态流变行为[D].杭州:浙江大学,2005.