摘要
以α,ω-二羟基聚二甲基硅氧烷为基础聚合物,以酮肟基硅烷为交联剂,配合特殊的固化促进剂和贮存稳定剂,制备了一种固化快、贮存稳定的脱酮肟型RTV-1硅酮密封胶。研究表明,添加的特殊固化促进剂质量分数为0.4%时,即可使密封胶的表干时间从10min缩短到3min,深层固化速率由3.1mm/24h提高到3.4mm/24h。同时,大幅度提高了力学性能及耐湿热老化性(85℃、85%RH,1000h)。添加贮存稳定剂,使密封胶的70℃加速老化贮存时间由3d提高为14d。密封胶生产过程稳定,操作简便。
The fast cruable and storage stable ketone-oxime type RTV-1 silicone sealant was prepared with a,w- dihydroxy polydimethyl siloxane,ketoximosilane crosslinking agent,special curing accelerator and storage stabilizer.The results showed that when the content of special curing accelerator was 0.4% by weight,the tack-free time was shortened to three minutes fronl ten minutes and the deep section curing speed was increased from 3.1 ram/24 h to 3.4 mm/24 h.The conventional mechanical properties and performance after hygrothermal aging （85℃,85% P-H for 1 000 h） were also increased greatly.The storage life was improved from 3 days to 14 days in 70℃ accelerated aging test by adding storage stabilizer.The producing process is stable and easy for operation.
出处
《粘接》
CAS
2013年第1期34-37,共4页
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