Homogeneous electorviscous liquids

摘要

Homogeneous electro-viscous liq. contain or consist of Al soaps obtd. by reaction of (un)satd., monomeric, oligomeric and/or polymeric 3-32C polycarboxylic acid(s) with 1 or more COOH gps., or anhydrides and/or semi-esters in which the alcohol component is an (un)branched, 1-12C mono- or poly-alcohol and/or oligomer, with an Al alcoholate in which the alcohol component is an (un)branched 1-18C aliphatic mono- or poly-alcohol. The Al soaps are pref. obtd. by reaction of a 3-18C (12-18C) polycarboxylic acid, anhydride or semi-ester, esp. a 5-18C (12-18C) alkenylsuccinic acid and/or semi-ester, partic. polycarboxylic acids, anhydrides or semi-esters with free OH gps.. The alcohol component of the semi-ester is a 1-6C (2-5C) di-, tri- or tetra-ol or an oligomer. In the Al alcoholates, the valency of the Al is (partly) the same. The electro-viscous liqs. contain (a) 2-50 (10-35) wt.% of the Al soap, in homogeneous soln., (b) 50-98% (65-90%) of a conventional hydraulic base fluid, and (c) 0-10% (0.1-2%) of soluble known hydraulic oil additive.