摘要
以聚氧化丙烯二元醇 (PPG - 10 0 0 )、甲苯二异氰酸酯 (TDI)为主要原料 ,γ -环氧丙氧基丙基三甲氧基硅烷 (KH - 5 6 0 )为有机硅改性剂 ,合成了KH - 5 6 0改性聚氨酯预聚物。采用 3,3′ -二氯 - 4 ,4′ -二氨基 -二苯基甲烷 (MOCA)为扩链剂 ,制备了新型有机硅改性聚氨酯弹性体。考察了KH - 5 6 0用量及不同加料顺序对改性聚氨酯弹性体力学性能的影响 ,并用傅里叶变换红外光谱法对KH - 5 6 0改性聚氨酯预聚体的结构进行了表征 ,对KH - 5 6 0化学改性聚氨酯弹性体的反应机制进行了初步探讨。结果表明 ,KH - 5 6 0中环氧基团参与了化学反应生成了—OH ,并将有机硅氧烷结构单元以化学键合的方式引入了聚氨酯主链结构中 ;当PPG - 10 0 0和TDI用量不变时 ,加入KH - 5 6 0提高了软链段的含量 ,并且形成的支链结构破坏了聚氨酯主链的规整性。改性聚氨酯弹性体的力学性能随着KH - 5 6 0用量的增大而显著降低。
New polyurethane elastomer modified by organic siloxane was prepared using poly(propylene glycol) (PPG-1000) and toluene diisocyanate (TDI) as main raw materials and γ-glycidylpropyltrimethoxy silane (KH-560) as organic silicane modifier to prepare polyurethane prepolymer modified by KH-560, then extended by 3,3′-dichloro-4,4′-diamino-diphenymethane(MOCA). The effects of content and adding order of KH-560 on the mechanical properties of modified polyurethane elastomers were investigated. The structure of the prepolymer was analyzed with FTIR. The reaction mechanism of polyurethane elastomers modified by KH-560 was primary studied. The results showed epoxy group in KH-560 joined to chemical reaction in preparation process of polyurethane elastomers to form —OH group and organic siloxane units were introduced to main chain structure of polyurethane with chemical bond. At the same amount of PPG-1000 and TDI, adding KH-560 as increasing amount of polyols component increased the contents of soft segments, and the formed branched chains breaked the regularly main chain structure of polyurethane. So, the mechanical properties of polyurethane elastomers greatly decreased with increasing KH-560 contents.
出处
《合成橡胶工业》
CAS
CSCD
北大核心
2005年第1期26-30,共5页
China Synthetic Rubber Industry
基金
广东省科技攻关资助项目 (99M 0 2 3 0 3G)