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A rod-shaped valve stem 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 blowout preventer valves, poor resistance to medium corrosion, and poor sealing of valve stems, etc., and achieve excellent thermal stability and chemical stability High performance, strong resistance to medium corrosion, fast and sensitive switching

Active Publication Date: 2022-07-19
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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  • A rod-shaped valve stem sealant composition and preparation method thereof
  • A rod-shaped valve stem sealant composition and preparation method thereof
  • A rod-shaped valve stem sealant composition and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

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

[0033] 1) First, 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, heating and stirring to 60 ± 5 ° C, constant temperature stirring for 30 ± 5 minutes, so that the base oil and the tackifier are dispersed evenly, and then 11 parts of organic bentonite A (with dimethyl octadecane) are added. benzyl amine chloride covering treatment) and 22 parts polyethylene wax (V 149 =65mm 2 / s), continue to heat up and stir to 130±5°C, and stir at a 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 turn, stir and disperse for 30±5 minutes, then discharge the material into a barrel, immediately grind it once through a three-roller mill, and hold it into a...

Embodiment 2

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

[0038] 1) First, 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, heating and stirring to 60 ± 5 ° C, constant temperature stirring for 30 ± 5 minutes, so that the base oil and the tackifier are dispersed evenly, and then 6 parts of organic bentonite A (with dimethyl octadecane) are added. benzyl amine chloride covering treatment), 7 parts of organobentonite B (covering treatment with dimethyl dioctadecyl amine chloride) and 24 parts polyethylene wax (V 149 =92mm 2 / s), continue to heat up and stir to 130±5°C, and stir at a 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 turn, stir and disperse for 30 ± 5 minutes, then discharge the material into a barrel, immediately grind it once through a t...

Embodiment 3

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

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

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Abstract

The invention discloses a rod-shaped valve stem sealant composition, comprising the following components in proportions by weight: 6-62.9 parts of ester base oil, 5-15 parts of organic bentonite, 15-30 parts of tackifier, 10-30 parts of ethylene wax, 2-8 parts of asbestos fiber, 5-10 parts of colloidal graphite, and 0.1-1 part of corrosion inhibitor. The invention also discloses a preparation method of the rod-shaped valve stem sealant composition. The present invention uses organic bentonite to thicken ester base oil, and is matched with a stick-shaped valve stem sealant compound made of tackifier, solid lubricant, molding agent and corrosion inhibitor, and has excellent thermal stability and chemical stability. High resistance to medium corrosion, excellent sealing, pressure resistance, adhesion and wear resistance. It is suitable for sealing, lubrication and protection of hydraulically controlled blowout preventers and valve stems of hydraulically controlled gate valves in oil and gas fields. It is also suitable for the sealing and lubrication of valve stems of other high temperature and 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, which is used to transmit power. It is connected to the actuator or handle, and the lower part directly drives the valve core or valve plate to move or rotate, so as to realize the valve switch or adjustment. The valve stem is not only a moving part, a force-bearing part, but also a sealing part during the valve opening and closing process. At the same time, it is impacted and corroded by the medium, and it also produces friction with the filler. [0003] The wellhead device for oil and gas production in the oil field is composed of many valves. Among them, the wellhead hydraulically controlled blowout preventer and the hydraulically controlled gate valve are a kind of safety device. Once the oil and gas blowout ...

Claims

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Application Information

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Patent Type & Authority Patents(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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