Functional fluids and concentrates for functional fluids containing associative polyether thickeners and certain metal dialkyldithiophosphates.

摘要

Fluid concentrates for aqueous functional fluids useful in hydraulic systems or as metalworking compositions contain (a) a cloud point raising metal dialkyldithio-phosphate additive having the following structural formula: <CHEM> wherein R1, R2, R3, and R4 are individually linear or branched alkyl, alkenyl, aryl, arylalkyl and alkylaryl groups having from 1 to 24 carbon atoms; and M is Zn, Sb, Sn, Mg or Mn; preferably Zn or Sb; (b) a polyether nonionic surfactant; and (c) an associative polyether thickener.