摘要
由100份端羟基聚二甲基硅氧烷(HTPDMS)和8份甲基三乙酰氧基硅烷构成的脱醋酸型单组份室温硫化硅橡胶中,分别加入3-氨丙基三乙氧基硅烷(APTES)、3-(2-氨基乙胺基)丙基三乙氧基硅烷(AATS)和二乙胺基甲基三乙氧基硅烷(DMTS)三种氨基硅烷,并改变用量为0.5、1.0、1.5、2.0和2.5份。从胶料固化过程中的粘弹性行为、表干时间和交联度等方面研究三种氨基硅烷的催化作用,并与二月桂酸二丁基锡(DBTDL)进行对比。胶料固化过程中损耗系数(tanδ)与复数粘度变化结果表明:三种氨基硅烷在该胶料中的催化作用与它们的碱性直接相关,碱性最强的AATS在低于1.5份用量下,表现出最高的催化效率,但由于其易自缩合成低聚物,在用量高于1.5份后,催化效率降低;DMTS的碱性强于APTES,在各用量下,其催化效果均好于APTES,通过增加DMTS的用量可获得接近于DBTDL的催化效果。各胶料固化12 h后的交联度结果表明氨基硅烷在胶料中主要起催化作用,交联作用不明显。
3-aminopropyltriethoxysilane(APTES), 3-(2-aminoethylamino)propyltriethoxysilane(AATS) and diethylaminomethyltriethoxysilane(DMTS) were added to deacidi fied room temperature vulcanized silicone rubber(RTV silicone rubber) respectively, which was consisted of 100 phr hydroxyfunctionalized poly(dimethylsiloxane)(HTPDMS) and 8 phr methyltriacetoxysilane. The amounts varied in 0.5, 1.0, 1.5, 2.0, and 2.5 phr. Their catalysis efficiency in the curing process of rubber stocks was studied by the viscoelastic behavior, tack free time and cross-linking degree. A comparison was performed with dibutyltin dilaurate(DBTDL). The results shows that the catalysis efficiency of three amino silanes is related to their alkalinity directly. Due to the strongest alkalinity, AATS shows the highest catalysis efficiency under 1.5 phr amount. However, more than 1.5 phr AATS will lead to decline of catalysis efficiency because of sel f-condensation. As the stronger alkalinity, DMTS exhibits higher catalysis efficiency than APTES. Furthermore, DMTS and DBTDL have a closer catalysi s efficiency to DMTS. The results of cross-linking degree after curing for 12 h reveals that the amino silanes mainly play a catalytic role in the rubber stocks, instead of cross-link effects.
引文
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