CS214522B1 - Lubricant for hot water compressors prepared from paraffinic Arop oils - Google Patents

Abstract

The invention relates to the production of low-solidification oils with a freezing point of around -40 °C from paraffinic oils, using a combination of a freezing point depressant, a viscosity modifier and a defoamer as additives to petroleum oil. The addition of a combination of the above additives ensures the required low-solidification properties of the oil, increased strength of the lubricating film, and thus increased anti-puncture properties of the oil and resistance to foaming. The benefit of the invention is the preparation of oil with the above properties from oil components from paraffinic oils without the need for their deep dewaxing, which is energy and technologically demanding. The lubricant according to the invention can be used for piston and screw compressors of refrigeration equipment.

Description

The present invention relates to a lubricant for compressors prepared from paraffinic oils.

U.S. Pat. No. 3,892,671 heats a lubricant comprising an acrylate polymer having a molar mass of 10,000 to 20,000 pbp as a pour point depressant and as a dispersant and an ethylene propylene copolymer pbp as a viscosity index enhancer.

The subject matter of the invention US. No. 3,449,459 is a lubricant for compressor burners prepared from alkylbenzenes containing multiple short alkyl chains, prepared by alkylation of olefins with, for example, a trimer, a tetramer or a pentamer of propylene.

Patent NSR 2 503 613 describes a composition of a polydecene-based lubricant for freezing systems. '

Lubricating oil for refrigeration machines based on a polyorganoalkoxysiloxane liquid is the subject of the invention of the USSR AP 414 292..

In accordance with the present invention, it has been found that oils for smoothing compressors operating at temperatures of -40 ° C and above can be prepared from oils obtained from paraffin oils by combining them with an oil freezing point depressant having a viscosity modifier capable of reducing the point. oil solidification and with a polysiloxane defoamer.

Oil derived from paraffinic petroleum must be dewaxed to a pour point of maximum -1 ° C. It is preferred to use dewaxed oils at a pour point of -8 ° 0 to -13 ° C. viscosity

The dewaxed oil can range from 3.5 to 6 m @ 2 / e at 20 DEG C. to 60 mm / s at 50 DEG. The flash point of the base oil must be at least 135 ° C.

Freezing point depressants are substances which, when added in an amount of up to 3.3 parts by weight, only affect to a small extent, or moreover, do not affect the viscosity of the base oil, such as mono- and di-alkylnaphthalenes with alkyl containing. 24 to 30 carbon atoms, alkylphenyl esters of phthalic acid.

Modifiers Viscosities capable of lowering the freezing points of petroleum oils are mainly represented by polymethacrylates. They are effective at a concentration of at least 0.01% by weight. In order to increase the film strength and improve the anti-wear properties of the lubricant for compressors, a maximum of 6.5 parts by weight of a viscosity modifier having a viscosity of 400 to 1500 mm ² / s at 100 ° C can be added economically.

In order to reduce the foaming of the lubricant for the compressor, a polysiloxane defoamer is added thereto in amounts of at most 0.2 parts by weight.

The polysiloxane defoamer can be used, for example. methyl phenyl polysiloxane, methylsiloxane or dimethylsiloxane with a kinematic viscosity of 50 to 700 m ² / s ^J at 20 ° C,

The lubricant for smoothing compressors prepared from paraffinic oil oils according to the present invention has the following advantages:

- the oil distillate or raffinate does not need to be dewaxed to the freezing point in the -40 C zone by an energy-intensive low-temperature deparaffination process or by hydrogenation dewaxing,

- Combination of the freezing point reducer with the viscosity modifier achieves the required freezing points within the range of -40 ° C, decreases the viscosity change depending on the lubricant temperature, increases the grease film strength and reduces the wear rate of the compressors due to reduced friction abrasion and prolongs the time between their repairs,

- the production cost of the lubricant according to the invention is lower than in the production of low-solid oils by the low-temperature deparaffinization process,

- emptying of the sludge separators can be done without heating them.

The lubricant of the present invention may be applied to piston and screw refrigeration compressors.

The following are non-limiting examples.

Example 1

Lubricant for refrigeration compressors consisting of,

96.95 parts by weight of petroleum oil dewaxed to a freezing point of -10 ° C and having a viscosity of 40 mm ² / s at 50 ° C and a flash point in an open crucible of 210 ° C,

2/0 part by weight of the oil set point depressant,

1.0 part by weight of a polymethacrylate-type viscosity modifier,

0.05 parts by weight of methylphenylsiloxane antifoam.

A grease having a freezing point of -38 ° C and having a value on a four-ball machine 115 was obtained.

- 125'kg. '·'

Example 2:. Cooling compressor lubricant consisting of / parts by weight of petroleum oil dewaxed to -1 ° C and having a viscosity

3.5 mm ^2/3 at 20 ° C,

3.3 parts by weight of the freezing point reducer,

6.5 parts by weight of viscosity modifier,

0.2 parts by weight of the polysiloxane defoamer. j

A grease having a freezing point of -38 ° C was obtained.

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Example 3

Cooling compressor grease consisting of 0.06 parts by weight of polysiloxane defoamer,

1.0 part by mass of the freezing point reducer,

1.0 part by weight of the viscosity modifier,

97.94 pbw of an oil having a pour point of -13 ° C, a viscosity of 60 mm ² / s at 50 ° C.

A grease having a freezing point of -38 ° C was obtained. ^λ

Claims (1)

as a result of the reduction in abrasion of the friction surfaces and the time limit between the repairs is prolonged, the production cost of the lubricant of the present invention is lower than in the production of low-fat oils by the process of low temperature deparaffinization, - the emptying of the sludge can be carried out without heating them. The lubricant of the present invention can be applied to piston and screw cooling compressors. For illustrative purposes, examples are given, but do not limit the invention. Example 1 Lubricant for refrigeration compressors consisting of "96.95 parts by weight dewaxed oil oil to a pour point -10 ° C and a low viscosity of 40 mm 2 / s at 50 ° C and an open cup point of 210 ° C, 2 / 0 part by weight of oil freezing point depressant, 1.0 part by weight of a viscosity modifier of the polymethacrylate type, 0.05 parts by weight of a methylphenylsiloxane defoamer, a lubricant having a freezing point of -38 ° C and a value of four-bead 115 - 125'kg. '· · Example 2: - Lubricant for refrigerating compressors consisting of / 90 parts by weight of dewaxed petroleum oil at -1 ° C and having a viscosity of 3.5 mm2 / 3 at 20 ° C, 3.3 parts by weight freezing point 6.5 parts by weight viscosity modifier, 0, 2 parts by weight poles of oxane antifoam agents j A lubricant with a freezing point of -38 ° C was obtained. of 0.06 parts by weight of a polysiloxane defoamer, 1.0 part by weight of a freezing point, 1.0 part by weight of a viscosity modifier, 97.94 parts by weight of a petroleum oil having a freezing point of -13 ° C, a viscosity of 60mm 2 / s at 50 ° C . A lubricant with a freezing point of -38 ° C was obtained. λ P RE DM BT THREAD XLEZU Lubricant for refrigeration compressors prepared from paraffinic oils r3p, characterized in that it consists of at least 90 parts by weight of petroleum oil having a freezing point of at most -1 ° C, a kinematic viscosity of from 3.5 to 6 mm² / a at 20 ° C to 60 nm / sec at 50 ° C, a maximum of 3.3 parts by weight, preferably one weight diol, reduces the oil stiffness to a maximum of 6.5 parts by weight, preferably a weight part of the viscosity viscosity capable of reducing freezing points of petroleum oil and at most 0.2 parts by weight of a polysiloxane defoamer.