RU2400534C1 - Method of preparing grease - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: liquid glass (A) undergoes preliminary chemical modification with potassium silicofluoride (B) and polyvinyl acetate (C) in ratio A:B:C between 92:4:4 and 52:22:26 by mixing in a reactor with not less than 200 rpm for 10-40 minutes at room temperature. While the mixer is working, a petroleum processing product, fatty acid soap and filler are fed into the reactor and stirring continues for 5-25 more minutes. The obtained grease contains the following in pts. wt: petroleum processing product 10-70, modifying liquid glass 5-35, soap 5-20, filler 3-25.

EFFECT: improved antifriction properties of grease under heavy loads and high adhesion to metal.

2 tbl, 7 ex

Description

The invention relates to the field of creating lubricants used in railway transport to reduce lateral wear of rail tracks, wheel flanges of cars and locomotives, as well as protective equipment for rolling units of wheeled and tracked vehicles, and other purposes.

Most of the known methods for producing lubricants for these purposes are reduced to the use of various mineral lubricants containing as additives soap, antiwear fillers and other ingredients.

Anti-wear efficiency in many cases is achieved through the introduction of synthetic molybdenum disulfide (MoS ₂ ). See, for example, patent RU 2204584 (13) C1, as well as patent RU 2200184 (13) C2.

However, synthetic MoS _{2 is a} rather expensive and scarce product and, in addition, precipitates due to its high specific gravity.

The closest prototype of the claimed invention is a lubricant and a method for its production, which is a mixture of an oil refining product - Transol-200, including hydration of calcium soap based on fatty acids, liquid soap and graphite filler (see RU 2067110 (13) C1). The introduction of cheap liquid glass in the composition of the lubricant improves its antifriction properties at a specific load in contact of more than 2000 MPa and at the same time eliminates the need for the use of expensive components.

At the same time, it is known that liquid glass is an unstable product under atmospheric conditions both during storage and as part of a lubricant, and the lubricant containing it has low adhesion to the rail metal.

The aim of the invention is a production method that improves the antifriction properties of greases under high loads and increases their adhesion to metal.

This goal is achieved by the fact that liquid glass (A) is preliminarily subjected to chemical modification with potassium silicofluoride (B) and polyvinyl acetate (C) in a ratio of A: B: C from 92: 4: 4 to 52:22:26 by mixing in a reactor with a number revolutions of at least 200 per minute for 10–40 minutes at room temperature, followed by the addition of the remaining components to the reactor with the stirrer operating and additional mixing for 5–25 minutes, while grease contains in parts by weight:

Oil refining product - 10 ÷ 70 Modified Liquid Glass - 5 ÷ 35 Soap - 5 ÷ 20 Filler - 3 ÷ 25

Example 1

A mixture of liquid glass A (GOST 13078-67), potassium silicofluoride (K ₂ SiF ₆ ) (B) and polyvinyl acetate in the form of a dispersion (C) (GOST 18992-73) in an amount of 20 parts by weight in the ratio A: B: C = 72: 14: 15 and mixed for 25 minutes under normal workshop conditions without heating. Then, in turn, 40 parts by weight are added to the obtained product. spindle oil (AU GOST 164275) and 14 parts by weight graphite (GOST 8295-37). The mixture is stirred for 20 minutes and poured into a closed container.

Examples 2-7 are carried out analogously to example 1, but using the ratios and parameters in accordance with table 1.

The properties of the obtained greases are shown in table 2, which shows the advantages of the proposed method.

Table 1 The conditions for the implementation of the proposed method according to examples 2-7 Name of parameter and component Parameter by parameter 2 3 four 5 6 7 1. The mixing time of the components A: B: C 10 40 25 25 25 10 2 The ratio of components A: B: C and their total amount, parts by weight 71:14:15
twenty 71:14:15
twenty 92: 4: 4
twenty 52:22:26
35 71:14:15
5 71:14:15
twenty 3 Type of oil refining product and its amount, parts by weight Cylinder Oil 70 Industrial oil 40 Petroleum oil ( _{solidification} T ≤40 ° C) 10 A mixture of spindle oil with industrial oil 40 A mixture of solid oil and fuel oil (in a ratio of 1: 1) 40 Spindle oil 70 4 Type of soap and its amount, parts by weight 12-oxystearate 4-7 lithium stearate 12 oleic acid hydrated calcium soap 12 oleic acid hydrated calcium soap 12 oleic acid hydrated calcium soap 5 Oil Tar Soap 20 Na-Ca 12-oxystearate 4-7 lithium stearate 12 5 The number and type of injected filler, parts by weight Scaled Graphite 14 Silicon Carbide 14 Iron Powder 14 Serpentenite 25 Powder of copper and fluoroplastic (in the ratio 1: 1) 3 Copper powder and sodium phosphoromolybdate (1: 3 ratio) 5

table 2 The properties of greases obtained by the present method in accordance with examples 1 ÷ 7. Name of indicator The value of the indicator for examples Prototype one 2 3 four 5 6 7 1. Stability of the lubricant during storage, until separation not less than 24 months not less than 24 months not less than 24 months not less than 24 months not less than 24 months not less than 24 months not less than 24 months 3 months 2. Grease adhesion to steel 3, MPa 8 9 7 8 7 7 7 3 3. Permissible operating temperature range From -50 ° C to 250 ° C From -50 ° C to 250 ° C From -50 ° C to 250 ° C From -50 ° C to 250 ° C From -50 ° C to 250 ° C From -50 ° C to 250 ° C From -50 ° C to 250 ° C From -50 ° C to 100 ° C 4. Critical load, not less than, N 850 900 900 850 850 870 870 700 5. The wear spot on a four-ball tribometer, mm 0.55 0.6 0.55 0.65 0.6 0.55 0.45 0.7

Claims (1)

A method for producing greases based on oil products containing liquid glass, soaps based on fatty acids and alkali metals, as well as a filler, characterized in that liquid glass (A) is preliminarily chemically modified with potassium silicofluoride (B) and polyvinyl acetate (C) c A: B: C ratio from 92: 4: 4 to 52:22:26 by mixing in a reactor with a speed of at least 200 rpm for 10-40 minutes at room temperature, followed by addition of the remaining components to the reactor with the stirrer operating and complement mixing for 5 ÷ 25 min, while the grease contains, by weight:
oil product 10-70 modified liquid glass 5-35 soap 5-20 filler 3-25