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CHEN Wei 1,AN Ping 1,CHEN Yanxue 2,LI Yang 1,YAN Xilong1,CHEN Ligong1
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陈 炜1,安 平1,陈艳雪2,李 阳1,闫喜龙1,陈立功1
Abstract:
Dendertic hindered amine light stabilizers with lower basicity were prepared via Michael addition and transesterification reactions with dimethyl malonate,methyl acrylate,2,2,6,6-tetramethyl- piperidine-4-ol and 1,2,2,6,6-pentamethyl-piperidine-4-ol as the main starting materials,the product yields were 89.3% and 78.0% respectively based on dimethyl malonate. The optimum conditions for Michael addition were found as 1∶2.2 molar ratio of dimethyl malonate with methyl acrylate,2.2eq NaOMe as catalyst for 4 h reaction;and those for the transesterification were found as,1∶4.8 molar ratio of the addition product with 2,2,6,6-tetramethyl-piperidine-4-ol or 1,2,2,6,6- pentamethyl-piperidine-4-ol,2% tetraisopropyl orthotitanate of the addition product as catalyst for 24h reaction. The pH values of the synthesized compounds were 8.7 and 6.6,respectively.
摘要:
以丙二酸二甲酯、丙烯酸甲酯、2,2,6,6-四甲基哌啶醇、1,2,2,6,6-五甲基哌啶醇等为主要原料,经Michael加成、酯交换反应合成了低碱性树枝状受阻胺光稳定剂,目标产物总收率分别为89.3%和78.0%(以丙二酸二甲酯计)。优化的合成条件为:Michael加成反应中,n(丙二酸二甲酯)︰n(丙烯酸甲酯) =1︰2.2,以NaOMe为催化剂,与丙二酸二甲酯的摩尔比为2.2,反应温度为20 ℃;酯交换反应中,n(加成产物)︰n(2,2,6,6-四甲基哌啶醇/1,2,2,6,6-五甲基哌啶醇)=1︰4.8,以四异丙基钛酸酯为催化剂,用量为加成产物质量的2%,反应时间24 h。所合成的化合物pH值分别为8.7和6.6。
CHEN Wei 1,AN Ping 1,CHEN Yanxue 2,LI Yang 1,YAN Xilong1,CHEN Ligong1. Synthesis of dendritic hindered amine light stabilizers with lower basicity[J]. .
陈 炜1,安 平1,陈艳雪2,李 阳1,闫喜龙1,陈立功1. 低碱性树枝状受阻胺光稳定剂的设计与合成 [J]. CIESC Journal.
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https://hgxb.cip.com.cn/EN/Y2010/V29/I9/1737