CS215395B1 - Synthetic functional liquid based on chlorinated diphenyls - Google Patents

Abstract

Synthetic functional fluid based on chlorinated diphenyls, which consists of 90 to 98% by weight of alkylchlorodiphenyl, containing 0.6 to 2 alkyl groups in the number of 3 to 12 carbon atoms and 1.8 to 3 chlorine atoms, 0.5 to 5% by weight of styrene polymer with a molecular weight of 30,000 to 250,000 and additives for increasing lubricity, against corrosion, for increasing oxidation stability and against foaming. The synthetic functional fluid according to the invention is intended in particular for hydraulic power transmission, for heat removal from thermally exposed areas and for lubricating friction surfaces of various machines.

Description

(54) Synthetic functional fluid based on chlorinated diphenyls

Synthetic functional fluid based on chlorinated diphenyls, consisting of 90 to 98% by weight of alkylchlorodiphenyl, containing 0.6 to 2 alkyl groups with 3 to 12 carbon atoms and 1.8 to 3 chlorine atoms, 0.5 to 5% by weight of styrene polymer with a molecular weight of 30,000 to 250,000 and additives to increase lubricity, anti-corrosion, to increase oxidation stability and to prevent foaming.

The synthetic functional fluid according to the invention is intended primarily for hydraulic power transmission, for heat dissipation from thermally exposed areas and for lubricating friction surfaces of various machines.

The invention relates to a synthetic functional fluid based on chlorinated diphenyls used mainly for hydraulic power transmission, for heat dissipation from thermally exposed areas and for lubricating friction surfaces of various machines.

Functional fluids having limited flammability are known, which consist of mixtures of chlorinated diphenyls with various refining additives.

The disadvantage of these previously known fluids is a negative viscosity index, which is manifested by a large dependence of the kinematic viscosity on the temperature of the fluid. Compared to commonly used mineral oils, these functional fluids have a lower lubricating ability, a slight tendency to corrosiveness, foaming and are harmful to health.

The object of the invention is to provide a synthetic functional fluid with a high viscosity index and limited flammability.

The invention solves the above-mentioned problem in that the synthetic functional fluid consists of 90 to 98 wt. % alkylchlorodiphenyl containing 0.6 to 2 alkyl groups in the number of 3 to 12 carbon atoms and 1.8 to 3 chlorine atoms, 0.5 to 5 wt. % styrene polymer with a molecular weight of 30,000 to 250,000 and an additive of 0.2 to 5 wt. % zinc salt of dialkyldithiophosphoric acid, containing 1 to 8 carbon atoms, 0.1 to 0.5 wt. % succinic acid imide ester, 0.1 to 0.5 wt. % 2,6-ditertbutyl 4-methylphenol and 0.01 to 0.1 wt. % polymethylsiloxane and optionally an addition of 5 to 20 wt. mineral oil with a kinematic viscosity of 240 to 300 mm ² /s at 50°C.

The synthetic functional fluid according to the invention has very good oxidation stability, lubricating ability and anti-corrosion properties.

The invention is further illustrated by several exemplary embodiments, by which its scope is not limited or exhausted.

In all the examples given, alkylchlorodiphenyl containing 0.6 to 2 alkyl groups of 3 to 12 carbon atoms and 1.8 to 3 chlorine atoms was used.

Example 1

Synthetic fluid for the lubrication of air compressors and hydraulic equipment with a content by weight of:

95.59% alkyl chlorodiphenyl 3.0% molecular weight polystyrene

000

0.25% 2,6-ditertbutyl 4-methylphenol 0.3% succinic acid imide ester 0.6% zinc salt of dialkyldithiophosphoric acid containing 1 to 8 carbon atoms 0.01% silicone oil MS 200

This liquid has the following analytical values:

Viscosity at 50 °C 40.0 mm ² /s

100 °C 5.67 mm ² /sØ

Viscosity index 104

Freezing point - 22 °C acid number 0.04 mg KOH/g Density at 20°C 1.23 g/ ^cm3 Example 2

Fluid for high-pressure hydraulic equipment with a mass content of:

92.99% alkyl chlorodiphenyl 5% polystyrene molecular weight

000'

0.5% 2,6-ditertbutyl 4-methylphenol 1.0% zinc dithiophosphate 0.5% succinic acid imide ester 0.01% silicone oil MS 200

The liquid has the following properties

Viscosity at 50 °C 100 °C

Viscosity index Pour point Acid number Density at 20 °C

54.5 mm ^and /s 10.42 mm ² /s 100

--22°C

0.05 mg KOH/g 1.22 g/cm ³

Example 3

Synthetic fluid for lubricating oxygen and air compressors with a mass content of:

97.64% alkylchlorodiphenyl

2.5% polystyrene with a molecular weight of 137,000

0.5% 2,6-di-tert-butyl 4-methylphenol

0.25% succinic acid imide ester 0.01% silicone oil MS 200

The liquid has the following properties

Viscosity at 20 °C 50 °C 100 °C

Viscosity index Acid number Pour point Density at 20 °C

Example 4

182.4 mm ² /s 30.27 mm ² /s 7.3 mm ² /s 119

0.05 mg KOH/g —23 °C 12 5 g/cm ³

Synthetic fluid for lubricating oxygen turbocompressors with a mass content of:

97.49% alkyl chlorodiphenyl 1.5% polystyrene molecular weight

200,000

0.25% 2,6-di-tert-butyl-4-methylphenol

0.25% succinic acid imide ester

0.50% zinc salt of dialkyldithiophosphoric acid containing 1 to 8 carbon atoms

0.01% silicone oil MS 200

The liquid has the following properties

Viscosity at 50°C 100 °C

Viscosity index Acid number Pour point Density at 20 °C

Example 5

24.15 mm ² /s 5.50 mm ² /s

0.05 mg KOH/g —24 °C 1.24 g/emf

Synthetic fluid suitable for lubricating steam turbines with a mass content of:

89.94% alkyl chlorodiphenyl 1.30% molecular weight polystyrene

137,000

8.0% mineral oil with a kinematic viscosity of 300 mm ² /s at 50 °C

0.5% 2,6-ditertbutyl-4-methylphenol 0.25% succinic acid imide ester 0.01% silicone oil MS 200

The liquid prepared in this way has the following properties:

Viscosity at 50 °C 100 °C

Viscosity index Pour point Acid number Density at 20°C

25.8 mm ^and /s 5.76 mm ² /s 28 —24 °C

0.05 mg KOH/g 1.15 g/cm ⁸

The synthetic functional fluid according to the invention is intended primarily for hydraulic power transmission, for heat dissipation from thermally exposed areas and for lubricating friction surfaces of various machines.

Claims (1)

SUBJECT Synthetic functional liquid based on chlorinated diphenyls with the addition of zinc salt of dialkyldithiophosphoric acid containing from 1 to 8 carbon atoms for increasing lubricity, imidester of succinic acid against corrosion, 2,6-di-tert-butyl-4-methylphenox for increasing oxidation stability and polymethylsiloxane against foaming. % to 90 to 98 wt. alkyl chlorodiphenyl containing from 0.6 to 2 alkyl groups of 3 to 12 carbon atoms and 1.8 to 3 chlorine atoms, 0.5 OF THE INVENTION up to 5 wt. % of a styrene polymer having a molecular weight of 30,000 to 250,000 and 0.2 to 5 wt. dialkyldithiofosforečné zinc salt containing 1-8 carbon atoms, 0.1 to 0.5 ° / ₀ by weight. % of succinic acid imidester, 0.1 to 0.5 wt. % Of 2,6-di-tert-butyl-4-methylphenol, 0.01 to 0.1 wt. % polymethylsiloxane and optionally from 5 to 20 wt. mineral oil having a kinematic viscosity of 240 to 300 mm ² / s at 50 ° C.