| 摘要 |
Quaternary ammonium salts of the formula R1-K(+)A(-) in which R1 denotes C12-C26-alkyl or C12-C26-alkenyl, K(+) denotes a group of the formula <IMAGE> or -(+)N(R2)3, R2 denotes C1-C3-alkyl, preferably methyl, and A(-) denotes an anion of one of the following formulae: R3SO3(-), in which R3 is C6-C9-alkyl or alkenyl and the sum of C atoms in R1 and R3 should be at least 21; <IMAGE> +TR <IMAGE> in which Hal is fluorine, chlorine, bromine or iodine, R4 is C1-C5-alkyl, C2-C5-alkenyl or C1-C5-alkoxy in positions 3, 4, 5 or 6, R5 is hydrogen or hydroxyl in positions 2 or 3, R6 is COO- or SO3- and R7 is hydrogen or methyl, with the exception of the salicylate and m-halogenobenzoate ions when combined with C16-alkylpyridinium and C16-alkyltrimethylammonium. These salts are suitable as drag reducing agents in aqueous media with turbulent flow. |
