申请人:THE B.F. GOODRICH COMPANY
公开号:EP0591632A2
公开(公告)日:1994-04-13
Branched and cyclic N,N-dialkyldithiocarbamyl accelerators for the sulfur vulcanization of rubber have been found to generally perform as well as the corresponding straight chain N,N-dialkyldithiocarbamyl accelerators, but surprisingly do not produce detectable amounts of environmentally undesirable N-nitrosamines.
The branched N,N-alkyldithiocarbamyl accelerators are generally represented by the formula:
where R is a branched alkyl group, R' is an alkyl group which may or may not be branched or a cyclic alkyl group or an alkaryl or aryl group, X is another thiocarbamyl group of the same general structure, a primary alkylamino group, an alkylthio group, a 2-benzothiazyl group, or a metal ion, and n is an integer of from 1 to 6.
The cyclic dithiocarbamyl accelerators of the invention are generally represented by the formula
where X is another thiocarbamyl group of the same general structure, a primary alkylamino group, an alkylthio group, a 2-benzothiazyl group, or a metal ion, and n is an integer of from 1 to 6.
研究发现,用于橡胶硫化的支链和环状 N,N-二烷基二硫代氨基甲烷促进剂的性能通常与相应的直链 N,N-二烷基二硫代氨基甲烷促进剂相同,但令人惊讶的是,它们不会产生可检测到的对环境有害的 N-亚硝胺。
支链 N,N-二烷基二硫代氨基甲烷促进剂一般用式表示:
其中 R 是支链烷基,R'是烷基(可以是或不是支链烷基或环状烷基)或烷芳基或芳基,X 是具有相同一般结构的另一个硫代氨基甲酰基、伯氨基烷基、烷硫基、2-苯并噻吩基或金属离子,n 是 1 到 6 的整数。
本发明的环状二硫代氨基甲烷促进剂一般由式表示
其中 X 是具有相同一般结构的另一个硫代氨基甲酰基、伯氨基烷基、烷硫基、2-苯并噻 嗪基或金属离子,n 是 1 至 6 的整数。