为了研究热氧老化条件下多壁碳纳米管(MWCNTs)对无石棉垫片性能的影响,以加入不同种类和不同添加量MWCNTs制备的无石棉垫片为研究对象,测试了老化前后无石棉垫片的压缩率、拉伸强度和老化系数。结果表明:老化试验后,无石棉垫片压缩率降低、拉伸强度提高;未添加MWCNTs的原始垫片压缩率和拉伸强度变化最大,压缩率下降6.06%,拉伸强度提高5.02MPa;添加MWCNTs的垫片压缩率和拉伸强度相对差均小于原始垫片的相对差;不同种类MWCNTs对垫片老化后的性能影响不同;添加羟基化多壁碳纳米管(MWCNTs-OH)的垫片老化前后性能变化最小;添加质量分数1.2% MWCNTs-OH的垫片老化前后性能变化最小,垫片的耐老化性提升最明显。
To investigate the effects of multi-walled carbon nanotubes (MWCNTs) on the performance of non-asbestos gaskets under thermal-oxidative aging conditions,the compressibility,tensile strength and aging coefficient of the non-asbestos gaskets prepared by adding different types and amounts of MWCNTs were tested before and after aging.The results showed that after aging test,the compressibility of non-asbestos gaskets decreased and the tensile strength increased.The original gasket without MWNTs had the largest changes,with a 6.06% decrease in compressibility and a 5.02MPa increase in tensile strength.The relative differences of compression and tensile strength of the gaskets with MWNTs were smaller than those of the original gaskets.Different kinds of MWCNTs had different effects on the properties of the gaskets after aging.Considering all the properties,the specimens with hydroxylated multi-walled carbon nanotubes (MWCNTs-OH) had the smallest property change values before and after aging.When 1.2% MWCNTs-OH was added,the performance change of the gasket before and after aging was the least,and the aging resistance of the gasket was most obviously improved.
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基金资助
国家自然科学基金(51765024);昆明理工大学分析测试基金(2021M20202103047)
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