缩合型单组分RTV硅橡胶反应机理.docx

缩合型单组分RTV硅橡胶反应机理脱酮月亏型硫化机理ON-CMeEtON-CMeEt配制时：,N-CMeEtON-CMeEtON-CMeEtRi ON-CMeEt +H0(MezSiO )nH+RSji ON-CMeEtON»CMeEtON-CMeEtON-CMeEti 0一( MeiSiOR+ 2MeEtC-NOHON-CMeEtON-CMeEtON«CMeEt使用时:ONYMeEtON=CMeEt(MezSiO )n-R2H2OOHON-CMeEtOHR-Si -0( MezSiO )n-fi -R+2MeEtC-NOH2cMeEtON<MeEtOHOHR-Si 0( MezSiO )n一；i -RHOSis02cMeEtON«CMeEtRSi0(MezSiO )n-Si-R+ MeEtC-NOH（倬柱体）式中 Me为甲基;Et为乙基;R为甲基或乙烯基。脱醇型脱醉型RTV-1为室温湿气冏化，吸收空气中的水分脱去醉型小分了发生同化交联,固化机理:OCHSOCHSH3cSiOCH3 + H2O H3c SiOH + CH30HOCH3OCH3OCH；CH；H3c SiOH + HO OCH3CH3A H3COch3 ch3d'SiOSi CH5 : OCH3HO-S-HCH3yOCH, +H0SicArCH5ch3CH5OCH3 CH3A交联弹性体+2CH30H脱醋酸型制取中间体八甲基环四硅氧烷:n (CH；) ,SiCl2 H()-m.i:一O + H + CH；裂化f J：一。+ 4CH,羟基封端的聚二甲基硅氧烷的催化反应如下式：产，m l（CH；）2SiOJ4 + （CH3）4NOHx： （CH；）4N（）（）+ yHCH，+ D，八甲基环四硅氧烷）交联反应机理为：OAC()AC/HQ/CH；Si-O/C 7T- CH SiOACOACOHHO (CH02SiO-J-mHH2() - ACOHzOHCHSiOACH()/ 1=CH；Si-OHH、()- NJ)HO (CHJiSKHeHO (CH-mHH) (CHJS/mH CHJ-O (CHhSOTnHO (CHJ2sqmH