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Rodlike valve rod sealant composition and preparation method thereof

A sealant and composition technology, applied in the field of sealing lubricants, can solve the problems affecting the rapid and sensitive switch of the blowout preventer valve, easy to be dissolved by oil and gas, diluted, poor resistance to medium corrosion, etc., to achieve excellent thermal stability and chemical stability Stability, strong resistance to medium corrosion, and low friction coefficient

Active Publication Date: 2021-04-06
武汉博达特种润滑技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of using F-26VITONA sealant is expensive, while the use of ordinary lithium-based grease has the following disadvantages:
[0005] 1) The ability to resist medium corrosion is poor, and it is easily dissolved and diluted by oil and gas;
[0006] 2) Poor sealing and pressure resistance, resulting in poor sealing of the valve stem;
[0007] 3) Poor high temperature resistance, easy to lose;
[0008] 4) Because it is easy to lose, it will cause poor lubrication and affect the rapid and sensitive switch of the blowout preventer valve

Method used

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  • Rodlike valve rod sealant composition and preparation method thereof
  • Rodlike valve rod sealant composition and preparation method thereof
  • Rodlike valve rod sealant composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A rod-shaped valve stem sealing grease composition, the preparation method of which is:

[0033] 1) earlier the kinematic viscosity (V 40 =44mm 2 / s), 8 parts of polymethyl methacrylate (V 100 =1320mm 2 / s), 14 parts of low molecular weight polyisobutylene (V100 =3780mm 2 / s) into the reaction kettle together, heat up and stir to 60±5°C, and stir at constant temperature for 30±5 minutes to disperse the base oil and tackifier evenly, then add 11 parts of organobentonite A (based on dimethyloctadecane benzyl ammonium chloride covering treatment) and 22 parts polyethylene wax (V 149 =65mm 2 / s), continue to heat up and stir to 130±5°C, and keep stirring at constant temperature for 45±5 minutes.

[0034] 2) Add 8 parts of colloidal graphite, 5 parts of asbestos fiber and 0.2 part of T551 in sequence, stir and disperse for 30±5 minutes, then discharge the material into a bucket, grind it once through a three-roll mill immediately, hold it into a thick rod shape, and se...

Embodiment 2

[0037] A rod-shaped valve stem sealing grease composition, the preparation method of which is:

[0038] 1) the kinematic viscosity (V 40 =90mm 2 / s), 25 parts of low molecular weight polyisobutylene (V 100 =2490mm 2 / s) into the reaction kettle together, heat up and stir to 60±5°C, stir at constant temperature for 30±5 minutes to disperse the base oil and tackifier evenly, then add 6 parts of organic bentonite A (based on dimethyloctadecane Benzyl benzyl ammonium chloride covering treatment), 7 parts of organobentonite B (covering treatment with dimethyl dioctadecyl ammonium chloride) and 24 parts of polyethylene wax (V 149 =92mm 2 / s), continue to heat up and stir to 130±5°C, and keep stirring at constant temperature for 45±5 minutes.

[0039] 2) Add 7 parts of colloidal graphite, 6 parts of asbestos fiber and 0.5 part of T706 in sequence, stir and disperse for 30±5 minutes, then discharge the material into a barrel, grind it once through a three-roll mill immediately, h...

Embodiment 3

[0042] A rod-shaped valve stem sealing grease composition, the preparation method of which is:

[0043] 1) the kinematic viscosity (V40=32mm) of the trimethylolpropane ester of 12 parts of C5-C12 saturated fatty acids 2 / s), the kinematic viscosity (V40=79mm of the pentaerythritol ester of 17.7 parts of C5-C12 saturated fatty acid 2 / s), 22 parts of polymethyl methacrylate (V 100 =1980mm 2 / s) into the reaction kettle together, heat up and stir to 60±5°C, and stir at constant temperature for 30±5 minutes to disperse the base oil and tackifier evenly, then add 15 parts of organic bentonite B (based on dimethyl dioctadecyl Alkyl ammonium chloride covering treatment) and 15 parts polyethylene wax (V 149 =68mm 2 / s), continue to heat up and stir to 130±5°C, and keep stirring at constant temperature for 45±5 minutes.

[0044] 2) Add 10 parts of colloidal graphite, 8 parts of asbestos fiber and 0.3 part of T561 in sequence, stir and disperse for 30±5 minutes, then discharge the...

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Abstract

The invention discloses a rodlike valve rod sealant composition. The rodlike valve rod sealant composition comprises the following components in parts by weight: 6-62.9 parts of ester base oil, 5-15 parts of organic bentonite, 15-30 parts of a tackifier, 10-30 parts of polyethylene wax, 2-8 parts of asbestos fibers, 5-10 parts of colloidal graphite and 0.1-1 part of a corrosion inhibitor. The invention further discloses a preparation method of the rodlike valve rod sealant composition. The rodlike valve rod sealant composition prepared from the organic bentonite thickening ester base oil, the tackifier, the solid lubricant, the forming agent and the corrosion inhibitor has the advantages of excellent thermal stability and chemical stability, high medium etching resistance, excellent sealing property, excellent pressure resistance, excellent adhesion and excellent wear resistance. The rodlike valve rod sealant composition is suitable for sealing, lubricating and protecting a wellhead hydraulic control blowout preventer and a hydraulic control gate valve rod of an oil-gas field, and is also applicable to sealing and lubricating of valve rods of other high-temperature high-pressure liquid and gas medium valves.

Description

technical field [0001] The invention relates to the technical field of sealing lubricants, in particular to a rod-shaped valve stem sealant composition and a preparation method thereof. Background technique [0002] The valve stem is an important part of the valve. It is used to transmit power. The upper part is connected to the actuator or the handle, and the lower part directly drives the valve core or valve plate to move or rotate to realize the valve switch or adjustment function. The valve stem is not only a moving part, a stressed part, but also a sealing part during the opening and closing process of the valve. At the same time, it is impacted and corroded by the medium, and also has friction with the filler. [0003] Wellhead devices for oil and gas production in oil fields are composed of many valves, among which the wellhead hydraulic control blowout preventer and hydraulic control gate valve are safety devices. The flow is drawn out of the well site. In order t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/00C10M169/04C10N30/06C10N30/08C10N40/34C10N20/02C10N30/02C10N50/08
CPCC10M169/00C10M169/044C10M2207/2835C10M2201/041C10M2201/145C10M2201/102C10M2209/08C10M2205/026C10M2205/14C10M2215/223C10M2219/106
Inventor 曹杰吴超
Owner 武汉博达特种润滑技术有限公司
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