Grease for sealing threaded connections

 

(57) Abstract:

The present invention relates to technological and operational lubricants and can be used for sealing threaded pipe joints, mainly of oil equipment. The challenge is to develop a lubricant composition for sealing threaded joints, providing a durable coating on the threads, the multiple use of a lubricant when screwing and loosening of threaded connections, as well as reducing the drying time of lubrication. This object is achieved by creating a lubricant composition for sealing threaded joints, including graphite powder, liquid glass is a silicate of sodium, and the powder is thermally expanded graphite obtained by thermoresistive of graphite powder in a furnace at 800-1000C. table 1.

The technical field

The invention relates to technological and operational lubricants and can be used for sealing threaded pipe joints, mainly oil equipment - casing, tubing and other

The level of technology

Known sealing (screw) lubrication R-402, R-416, serially produced for THE 101708-78, to build and once the series of spats over oil oils thickening of the lithium stearates, aluminum, zinc, powders contain lead, copper, graphite. The drawbacks of such lubricants are washed out of the threaded connection, the oxidation of metal powders, which leads to an increase efforts screwing threads, incomplete sealing, disposable use.

Also known lubricant for sealing threaded joints.with. The USSR №1413123, 1986), containing, wt.%: graphite powder - 4, aluminum powder - 4, liquid glass - 92. The disadvantages of this grease are insufficient adhesion to metal and dripping with thread, a high coefficient of friction (up to 0.35). This grease after unscrewing the thread completely destroyed and before screwing should be applied again to the cleaned surface and dried for 12-18 hours.

Closest to the claimed technical solution on a set of attributes, i.e., the prototype, is the lubricant for threaded connections (ed. St. No. 1505963. Grease for sealing threaded joints. Bull. No. 33 of 07.09.89).

Grease for sealing threaded joints contains components, wt.%:

Graphite powder 15-65

Liquid glass 35-85

Lubrication after mixing apply on the thread brush or a brush and dried in natural 0,1 N/mm2), which leads to the destruction layer of grease on the threads during transportation and screwing, uneven coating and the formation of nodules. Long drying time makes it difficult to use lubricant directly in the working conditions. When re-threading the lubricant must be applied again.

The invention

Inventive task was to develop the lubricant's composition for sealing threaded joints, providing a durable coating on the thread, uniform (without flows and runoff) floor, multi-use lubricant when screwing and loosening of threaded connections, as well as reducing the drying time of lubrication.

This object is achieved by creating a lubricant composition for sealing threaded joints, including graphite powder, liquid glass is a silicate of sodium, and the powder is thermally expanded graphite obtained by thermoresistive of graphite powder in a furnace at 800-1000C, in the following ratio, wt.%:

The graphite powder 25-35

The above-mentioned thermally expanded graphite powder of 0.2-0.5

Liquid glass is a silicate of sodium To 100.

The graphite powder AUT-II is produced according to GOST vitovich parts of friction.

thermally expanded graphite powder obtained by thermal expansion in a furnace at a temperature of 800-1000C various powders of graphite (grade GAK, lubricants, AWT-II, pencil and others). Thermal expanded graphite has a special structure and properties and is used as a sorbent, thermal insulator, the cushioning material.

Liquid glass (sodium silicate) commercially manufactured according to TU 6-15-433-92 and is used mainly as an adhesive for paper and cardboard.

The use of declared essential features allows to obtain a technical result achieved, namely, to reduce the drying time of the lubricant applied to the threads, 3-4 times, to increase the strength of the coating (dry lubrication) 2-3 times, to provide a multiplicity of unscrewing and screwing threads up to 3 times (at 100% sealing of threaded connections).

Information confirming the possibility of carrying out the invention

Example 1. 25 g (25 wt.%) the graphite powder AUT-II and 0.2 g (0.2 wt.%) powder thermally expanded graphite obtained by thermoresistive of graphite powder in a furnace at 800-1000C, was placed in a glass or enamel bowl, added 74,8 g (74,8 wt.%) liquid glass and stirred until homogeneous is received by thermoresistive of graphite powder in a furnace at 800-1000C, put in a bowl and added 69,65 g (69,65 wt.%) liquid glass. The mixture was stirred to obtain a homogeneous paste.

Example 3. 35 g (35 wt.%) the graphite powder EUT and 0.5 g (0.5 wt.%) powder thermally expanded graphite obtained by thermoresistive of graphite powder in a furnace at 800-1000C, was placed in a glass bowl, added 64,5 g (of 64.5 wt.%) liquid glass and stirred to obtain a homogeneous paste.

The obtained paste is ready for use as a lubricant for sealing threaded joints.

The obtained grease compositions (in paste form) are not stratified and stable properties (in closed containers) for 180-200 days.

Assessment of quality lubricants conducted on the following parameters: drying time is marked on the thread lubricant - visually to harden the grease; the strength of the dry layer of grease deposited on a smooth steel plate, tested in compression to fracture layer on a tensile testing machine RM-3; number of zavorachivanija (AutoRecovery) thread in a single lubrication - visually at hydrotest threaded connection.

The results are given in the table.

The table shows that the drying time of grease on the threads has decreased by 3-4 times,Ivani) thread in a single lubrication.

The advantages of the proposed composition of the grease for sealing threaded connections may also include a low coefficient of friction (0.1); uniform (without flows) coating; a stronger connection with the metal pipe; filling of all microwave due to the presence in the composition of thermally expanded graphite; 100% sealing of threaded connections due to the elastic aftereffect of the powder particles thermally expanded graphite; the ability to work the lubricant into the threaded connection from-50C to + 400C due to the presence of thermally expanded graphite grease - prototype works from-50C to +S).

Grease for sealing threaded joints, including graphite powder and liquid glass sodium silicate, characterized in that it further comprises a thermally expanded graphite powder obtained by thermoresistive of graphite powder in a furnace at 800-1000C, in the following ratio, wt.%:

The graphite powder 25-35

The above powder is thermally expanded

graphite 0,2-0,5

Liquid glass is a silicate of sodium To 100

 

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