EXPLOSION- AND FIRE-SAFE WORKING FLUID Russian patent published in 2015 - IPC C10M105/74 C10M141/10 C10N40/08 C10N30/10 

FIELD: chemistry.

SUBSTANCE: invention relates to an explosion- and fire-safe working fluid which contains a mixture of phosphoric esters, which includes tributyl phosphate, dibutyl phenyl phosphate and triisobutyl phosphate, and additives - polybutyl methacrylate, epoxy compound 3,4-epoxycyclohexymethyl-3,4-epoxycyclohexyl carboxylate, anti-erosion additive, oxidation inhibitors, including 2,6-di-tert-butyl-4-methyl-phenol, 1,2,3-benzotriazole and a dye, wherein the mixture of phosphoric esters further includes trixylenyl phosphate; the anti-erosion additive is 4-trifluoromethylperfluoro-3,6-potassium dioxaoctane sulphonate, and the fluid further contains as oxidation inhibitors pentaerythryl-tetrakis-3-(3',5'-di-tert-butyl-4-hydroxy-phenyl)propionate and alkylated phenyl-alpha-naphthylamine, with the following ratio of starting components, wt %: polybutyl methacrylate 7.0-11.0; epoxy compound 2.0-5.0; 4-trifluoromethylperfluoro-3,6-potassium dioxaoctane sulphonate 0.06-0.14; 2,6-di-tert-butyl-4-methyl-phenol 0.4-1.0; pentaerythryl-tetrakis-3-(3',5'-di-tert-butyl-4-hydroxy-phenyl)propionate 0.25-0.75; alkylated phenyl-alpha-naphthylamine 0.8-1.2; 1,2,3-benzotriazole 0.005-0.015; dye 0.001-0.005; mixture of phosphoric esters - up to 100, with the following ratio of phosphoric esters in the mixture, wt %: tributyl phosphate 70.0-80.0; dibutyl phenyl phosphate 4.0-10.0; triisobutyl phosphate 10.0-20.0; trixylenyl phosphate 4.0-10.0.

EFFECT: high thermal oxidative stability, improved lubricant properties and hydrolytic stability of the working fluid.

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