Methylene-bis-(N,N-di:alkyl:di:thio:carbamate prodn. for elastomer and lubricant - by reacting sodium-N,N-di:alkyl:di:thio:carbamate(s) with methylene chloride

摘要

Prodn. of methylene-bis-(N,N-dialkyldithiocarbamates) comprises reacting highyly concentrated solns. of Na-N,N-dialkyldithiocarbamates (A) with methylene chloride (B). 0.55-0.6 mol (B) are used per mol (A). (A) is produced from the Na salt of N,N-dialkyldithiocarbamide acid and contains an excess of 0.05-0.2 mol NaOH per mol carbamate. During the course of the reaction, the temp. increases from room temp. to 80 to 90 deg.C. USE/ADVANTAGE - The methylene carbamates can be used as additives for elastomers, lubricants or asphalt compsns. Highly pure prod. is obtd. In an example, a starting mixt. of (A) and (B) was stirred at room temp., the reaction temp. was raised over 1 hr. to 50-60 deg.C; then to 80 deg.C over 2 hrs., and subsequently heated to 80 deg.C over 2 hrs., and subsequently heated to 90 deg.C for a short time to complete the reaction. 1-2 wt% of a filtering auxiliary agent was added to the highly concentrated sol. of (A) before reaction, the soln. was filtered, and then reacted with methylene chloride. 1-2 wt% Ca(OH)2 was added to the methylene-bis-(N,N-dialkyldithiocarmate) and then filtered.