甲醇对脱醇型RTV-1硅橡胶贮存稳定性的影响分析  

Analysis of Methanol on the Storage Stability of Dealcoholized RTV-1 Silicone Rubber

作　　者：赵春冠 梁力戈 朱勇 周菊英 ZHAO Chunguan;LIANG Lige;ZHU Yong;ZHOU Juying(Key Laboratory of Chemistry and Engineering of Forest Products,State Ethnic Affairs Commission,Guangxi Key Laboratory of Chemistry and Engineering of Forest Products/Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products,Guangxi Minzu University,Nanning 530006,China;Guangxi Huana New Materials Technology Co.,Ltd.,Nanning 530100,China)

机构地区：[1]广西民族大学,化学化工学院,林产化学与工程国家民委重点实验室,林产化学与工程国家民委重点实验室,广西林产化学与工程重点实验室/协同创新中心,南宁530006 [2]广西华纳新材料科技有限公司,南宁530100

出　　处：《有机硅材料》2025年第2期48-53,78,共7页Silicone Material

摘　　要：为探究脱醇型RTV-1硅橡胶贮存稳定性机理,通过外加无水甲醇模拟脱醇型RTV-1硅橡胶水解过程脱出的甲醇,研究了甲醇质量分数对脱醇型RTV-1硅橡胶加速贮存后性能的影响,并采用红外光谱、库仑滴定、热失重、拉曼光谱分析表征了甲醇与羟基硅油的化学反应过程,推导出脱醇型RTV-1硅橡胶贮存稳定性变化的机理。结果表明:在70℃下加速贮存5 d后,甲醇的存在会使密封胶的施工性能和力学性能显著下降,进而使其丧失使用价值。研究进一步表明,甲醇会与羟基硅油中的Si—OH反应,生成Si—O—CH_(3),推断出脱醇型RTV-1硅橡胶贮存稳定性变化的主要原因在于脱醇反应和端羟基的平衡化反应。To study the storage mechanism of dealcoholized RTV-1 silicone rubber,the process of released methanol in hydrolysis was simulated by adding anhydrous methanol.The effect of mass fraction of methanol on the performance of dealcoholized RTV-1 silicone rubber was investigated after accelerated storage.The process between methanol and hydroxyl silicone oil was characterized by infrared spectroscopy,coulomb titration,thermogravimetric analysis,and Raman spectroscopy,leading to the derivation of the mechanism for the storage change of dealcoholized RTV-1 silicone rubber.The results indicate that after 5 days of accelerated storage at 70℃,methanol significantly decreases construction and mechanical properties of the sealant,rendering it essentially unusable.Further research reveals that methanol reacts with Si—OH groups in the hydroxyl silicone oil to form Si—O—CH_(3).It is inferred that the main reasons for the change in storage stability of dealcoholized RTV-1 silicone rubber are the dealcoholization and the equilibration of terminal hydroxyl groups.

关 键 词：脱醇型 硅橡胶 贮存稳定性 甲醇 

分 类 号：TQ333.93[化学工程—橡胶工业]