氟硅生胶中甲基三氟丙基含量对密封剂性能的影响  

Effect of (γ-trifluropropyl methyl) siloxy-unit content of fluorosilicone rubber on performance of RTV foam sealant

作　　者：唐斌[1] 吴松华[1] 刘刚[1] 

机构地区：[1]北京航空材料研究院,北京10095

出　　处：《粘接》2013年第6期34-37,共4页Adhesion

摘　　要：选择具有不同甲基三氟丙基含量的氟硅生胶作为发泡密封剂的基体,配合纳米氧化锌、甲基含氢硅油和催化剂,制备了室温硫化的氟硅发泡密封剂。探讨了生胶中甲基三氟丙基含量对密封剂适用期、发泡特性、微观形貌及耐热性能的影响。结果表明,随着甲基三氟丙基含量的增加,密封剂的适用期延长,耐热性下降。当甲基三氟丙基含量0～66%时,其含量对密封剂的密度、发泡系数、泡沫的孔径及分布影响不大,但泡沫开孔率随着甲基三氟丙基含量的增加而不断提高;当甲基三氟丙基含量为100%时,密封3剂的密度达到最大值0.91g/cm3,发泡系数下降至最小值1.6。The room temperature fluorosilicone rubbers with different （ γ- vulcanized fluorosilicone foam sealants were prepared by using the liquid trifluropropyl methyl） siloxy-unit content as the basic material and compounding ZnO nanoparticles,methylhydrosilicone oil and catalyst.The influences of （ γ -trifluropropyl methyl） siloxy-unit content of fluorosilicone rubbers on the pot life,foaming characteristics,micro morphology and heat resistance of the sealant were studied.The results showed that the （γ-trifluropropyl methyl） siloxy-unit content have a significant impact on the properties of fluorosilicone foam sealants.The pot life of sealant went up and the heat resistance went down with the climbing of the （ γ -trifluropropyl methyl） siloxy-unit concentration.While the concentration of （ γ -trifluropropyl methyl） siloxyunit was between 0%- 66%,it had little impact on the density,foaming rate,size and size distribution of foam cells,but it leaded to the raise of cell-opening rate of foam.When the concentration reached 100%,the density of sealant was summited at 0.91g/cm^3 and the foaming rate decreased to a minimum value of 1.6.

关 键 词：室温硫化 甲基三氟丙基 发泡密封剂 

分 类 号：TQ436.6[化学工程]