Flame-retardant hydraulic oil composition

Abstract

Disclosed is a flame-retardant hydraulic oil which has a satisfactory antioxidant activity, an excellent inhibitory activity on the elution of zinc and good abrasion resistance, can respond to the increase in pressure and the tendency to be maintainance-free in hydraulic systems in recent years, and has a long service life. Specifically disclosed is a flame-retardant hydraulic oil composition comprising (A) at least one base oil selected from the group consisting of synthetic esters, oils and fats each of which is characterized in that the content ratio of an unsaturated fatty acid in fatty acid in fatty acids that constitute the ester moiety is 20 mol% or more and the acid value of the ester moiety is 1.0 mgKOH / g or less and (B) an alkylthiadizole in an amount of 0.001 to 1.0 mass% relative to the total amount of the composition. Preferably, the composition additionally comprises (C) a bis(4-dialkylaminophenyl)methane in an amount of 0.001 to 5.0 mass% relative to the total amount of the composition and / or (D) at least one triazole compound selected from the group consisting of a triazole derivative, a benzotriazole derivative and a tolutriazole derivative in an amount of 0.0001 to 1.0 mass% relative to the total amount of the composition.

Description

technical field [0001] The present invention relates to flame retardant hydraulic oil compositions, and more particularly to such flame retardant hydraulic oil compositions, which are most suitable for applications used under conditions of high temperature and pressure with a high risk of fire occurrence, such as for aluminum It is suitable for operation in die-casting extruders or ironworks equipment, and it is suitable for high-pressure pumps excellent in abrasion resistance, sludge inhibition, and especially zinc dissolution inhibition, so that it can be used for a long time. Background technique [0002] Generally, as a hydraulic oil used in places with a high risk of fire such as in aluminum die casting extruders or ironworks equipment, flame-retardant hydraulic oils (liquids) such as water-glycol or Fatty acid esters have been used to maintain the security of the premises. Especially in places subject to the Fourth Petroleum Regulation of the Fire Services Act, water-...

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Problems solved by technology

[0010] As described above, under the current circumstances, flame-retardant hydraulic oils excellent in wear resistance and capable of suppressing zinc elution and thus prolonging the working life are developed using synthetic esters or animal and vegetable oils produced from environmentally friendly and relatively inexpensive natural raw materials has been very difficult

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