无机氧化物对氟硅橡胶耐热性能的影响  

Effect of inorganic oxides on heat resistance of fluorosilicone rubber

作　　者：冯小亚 魏凯杰 胡彦杰[1] FENG Xiao-ya;WEI Kai-jie;HU Yan-jie(School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学材料科学与工程学院,上海200237

出　　处：《合成橡胶工业》2024年第2期147-152,共6页China Synthetic Rubber Industry

基　　金：国家自然科学基金面上项目(21978088)。

摘　　要：以自制纳米颗粒二氧化钛(TiO_(2))及铁掺杂二氧化钛(TiO_(2)/Fe_(2)O_(3))作为耐热剂,研究了其对氟硅橡胶热稳定性和耐热空气老化性能的影响规律,分析了氟硅橡胶在空气中热失重5%时的分解产物成分及氟硅橡胶在热老化前后特征基团含量的变化,并对比研究了商用耐热剂纳米氧化铈(CeO_(2))、三氧化二铁(Fe_(2)O_(3))和三氧化二铝(Al_(2)O_(3))对氟硅橡胶性能的影响。结果表明,当纳米耐热剂质量分数为2%时,氟硅橡胶在空气中的5%热失重温度从高到低依次为添加TiO_(2)/Fe_(2)O_(3)、TiO_(2)、Fe_(2)O_(3)、CeO_(2)、Al_(2)O_(3)试样和空白样;添加了纳米TiO_(2)/Fe_(2)O_(3)复合耐热剂的氟硅橡胶的5%热失重温度达到了453℃,比空白样提高了47℃。纳米TiO_(2)/Fe_(2)O_(3)复合耐热剂能显著抑制氟硅橡胶含氟侧基的氧化,这是氟硅橡胶耐热性能提高的主要原因。The effects of self-made nano particles titanium dioxide(TiO_(2))and iron-doped titanium dioxide(TiO_(2)/Fe_(2)O_(3))as heat-resistant additives on thermal stability and tensile properties of fluorosilicon rubber after hot air aging were studied.The decomposition products of fluorosilicon rubber at 5%weight loss in air and the content of characteristic groups of fluorosilicon rubber before and after thermal aging were analyzed.The effects of commercial heat-resistant additives,such as nano ceria(CeO_(2)),ferric oxide(Fe_(2)O_(3))and aluminum trioxide(Al_(2)O_(3))on fluorosilicone rubber were compared.The results showed that when the mass fraction of nano heat-resistant additive was 2%,the 5%weight loss temperature of fluorosilicone rubber in air from high to low was TiO_(2)/Fe_(2)O_(3),TiO_(2),Fe_(2)O_(3),CeO_(2),Al_(2)O_(3)samples and blank sample.The 5%weight loss temperature of fluorosilicone rubber with nano-TiO_(2)/Fe_(2)O_(3)heat-resistant additive reached 453℃,which was 47℃higher than that of blank sample.Nano-TiO_(2)/Fe_(2)O_(3)heat-resistant additive could significantly inhibit oxidation of fluorine-containing side groups of fluorosilicone rubber,which was the main reason for improvement of the heat resistance of fluorosilicone rubber.

关 键 词：氟硅橡胶 耐热剂 无机氧化物 硫化特性 热稳定性 拉伸性能 

分 类 号：TQ333.93[化学工程—橡胶工业]