CN1091455A - Sealing assistant - Google Patents

Abstract

The invention discloses a kind of sealing assistant, is tetrafluoroethylene concentrated emulsion 30-50% (wt), 250 purpose scale graphite micro mists 3-8% (wt), lubricating oil 30-50% (wt), the molybdenumdisulphide pulvis 10-20% (wt) of 25 centipoises (25 ℃) by solids content 60%, viscosity.Stirring after mixing, strand stone roller, extrusion, pelletizing form, this auxiliary agent and asbestos braided packing are used, can remedy the deficiency on the asbestos packing performance, have advantages such as high temperature resistant, chemical resistance, self-lubricating are good, good airproof performance, obviously reduce the axle wearing and tearing, improve 5-10 times of life-spans, cut down the consumption of energy 10-15%.

Description

Sealing assistant

The present invention relates to the sealing material that is used with asbestos seal filler.

Pump in the industrial equipments, valve arrangement, sealing are vital, and it directly influences the complete machine performance, therefore, have a large amount of sealing materials to satisfy the needs of these mechanisms.In lock packing, the asbestos braided packing is cheap especially by people's widespread usage because of its price, asbestos graphite packing for example, asbestos copper wire packing, asbestos oil immersion packing, but it is poor that its greatest drawback is a sealing effectiveness, easily form and sting the axle wearing and tearing, work-ing life is short, has increased maintenance mans' labour intensity greatly and has increased energy consumption, therefore, the cheap advantage that how to remedy the defective of asbestos packing and bring into play it is to be worth the problem inquired into.

Purpose of the present invention just is to utilize the cheap advantage of asbestos packing, uses the sealing assistant that reaches excellent sealing effect thereby release a kind of being mated.

The present invention is achieved by the following scheme: be ready to solids content earlier and be 60%, viscosity is the tetrafluoroethylene concentrated emulsion of 25 centipoises (25 ℃), 250 purpose scale graphite micro mists, lubricating oil, molybdenumdisulphide pulvis are stirred after mixing, drop into ptfe emulsion then, continue to stir, wherein the content of ptfe emulsion is 30-50%(wt), the content of graphite microparticles is that the content of 3-8%, lubricating oil is 30-50%(wt), the content of molybdenumdisulphide pulvis is 10-20%(wt).Above-mentioned mixture through stirring repeatedly twisted grind the agglomerating granular sealing assistant that promptly becomes that is cut into again.

Sealing auxiliary agent and asbestos braided packing are used alternately, can remedy the deficiency of filler and have advantages such as high temperature resistant, chemical resistance, self lubricity are good, good sealing effect, attenuating energy consumption, improve 5-10 doubly work-ing life through the practicality test, significantly reduce the axle wearing and tearing, 10-15% cuts down the consumption of energy, be a kind of sealing material with better economic worth, the sealing auxiliary agent also can be used with other braided packing, obtains good result equally.

Below in conjunction with specific examples the present invention is elaborated again.

Tetrafluoroethylene concentrated emulsion in the sealing assistant is the major ingredient of sealing, lubrication, but when emulsion less than 30% the time, mixture can not solidify, greater than 50% o'clock, the cost raising.Graphite microparticles also has been sealing, lubrication, and mixture is thin very little, otherwise produces loose phenomenon, gets 3-8%(wt) be advisable.Graphite microparticles utilizes middle carbon or the high-carbon of carbon content more than 95% of carbon content 80-95%.Lubricating oil can be silicone oil or machinery oil, and its effect is the same with the molybdenumdisulphide pulvis, lubricate, and lubricating oil is being less than at 30% o'clock, and mixture can't twist and grind agglomerating, just thins out greater than 50% o'clock.Therefore lubricating oil is got 30-50%(wt), molybdenumdisulphide is got 10-20%(wt) be advisable.

When making, presses sealing assistant above-mentioned weight percent earlier with 250 purpose phosphatization graphite microparticles, silicone oil, molybdenumdisulphide is mixing and stirring at normal temperatures, and then the input solids content is 80%, viscosity is that the tetrafluoroethylene concentrated emulsion of 25 centipoises (25 ℃) continues to stir, at this moment mixing resultant has played chemical transformation and has begun to solidify, it is carried out dewatered drying when stirring into after solidifying shape under the condition of 80 ℃-100 ℃ of oven temperatures, drying time is 4-6 hour, then repeat strand and grind agglomerating, strand long more toughness of stone roller time is good more, strand is ground good mixture to be placed on and to carry out extrusion in the extruding machine, carry out pelletizing technology at last, promptly become granulous sealing assistant of the present invention.

Embodiment 1:

Tetrafluoroethylene concentrated emulsion 30%

Graphite microparticles 8%

Silicone oil 50%

Molybdenumdisulphide pulvis 12%

Embodiment 2:

Tetrafluoroethylene concentrated emulsion 40%

Graphite microparticles 5%

Silicone oil 40%

Molybdenumdisulphide pulvis 15%

Embodiment 3:

Tetrafluoroethylene concentrated emulsion 50%

Graphite microparticles 3%

Silicone oil 30%

Molybdenumdisulphide pulvis 17%

Making resulting sealing assistant with above-mentioned three kinds of prescriptions, use by reality, is the best with embodiment 2 clearly; The phenomenon that embodiment 1 seems and a bit can't solidify, more difficult agglomerating pelletizing; Embodiment 3 plasticity are little, and hardness is big slightly, and the difficult gap everywhere of filling up asbestos packing has reduced sealing effectiveness, and the cost height.

Claims (6)

1, a kind of sealing assistant, comprise tetrafluoroethylene, Graphite Powder 99, lubricating oil mix strand grind be cut into granular, it is characterized in that described tetrafluoroethylene is that solids content 60%, viscosity are the concentrated emulsion of 25 centipoises (25 ℃), Graphite Powder 99 is 250 purpose scale graphite micro mists, also contains the molybdenumdisulphide pulvis in the mixture.

2, sealing assistant as claimed in claim 1, the content that it is characterized in that described ptfe emulsion is 30-50%(wt).

3, sealing assistant as claimed in claim 1 is characterized in that described graphite microparticles content 3-8%(wt).

4, sealing assistant as claimed in claim 1 is characterized in that described lubricating oil can be silicone oil or machinery oil.

5, as claim 1 or 4 described sealing assistants, it is characterized in that described lubricating oil content is 30-50%(wt).

6, sealing assistant as claimed in claim 1 is characterized in that described molybdenum disulphide powder agent content is 10-20%(wt).