USING ZWITTERION SURFACE-ACTIVE SUBSTANCE IN COMBINATION WITH ANIONIC SURFACE-ACTIVE SUBSTANCE COMPRISING ETHER GROUPS AS AGENT DECREASING HYDRAULIC RESISTANCE Russian patent published in 2006 - IPC C09K3/00 C10M173/02 F15D1/00 

FIELD: organic chemistry.

SUBSTANCE: invention relates to agents decreasing hydraulic resistance in pipe tubes. Invention proposes zwitterion surface-active substance of the formula:

wherein R means group comprising saturated or unsaturated aliphatic or acyl group with 10-24 carbon atoms; R₆ and R₇ mean independently of one another alkyl group with 1-4 carbon atoms or hydroxyalkyl group with 2-4 carbon atoms; R₄ means alkylene group with 1-4 carbon atoms. This surface-active substance is used in combination with anionic surface-active substance comprising ether groups of the general formula: R₁(OA)_nB, R₁O(AO)_nC_mH_2mD or R₃NH(AO)_nC_mH_2mD or their mixture wherein R₁ means hydrocarbon group with 10-24 carbon atoms; R₃ means acyl group with 10-24 carbon atoms; A means alkylene group with 2-4 carbon atoms; n = 1-10; m = 1-4. B means sulfate group -OSO₃M; D means carboxylate group -COOM wherein M means a cationic group. The weight ratio of zwitterion surface-active substance to anionic surface-active substance or ether-groups-comprising surface-active substance is from 100:1 to 1:1. This substance is used as agent decreasing hydraulic resistance in an aqueous-base flow-type liquid system. Proposed combination shows both high effect for decrease of hydraulic resistance and sensitivity to hard water.

EFFECT: improved and valuable properties of agent.

10 cl, 2 tbl, 2 ex