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Low-temperature rodlike valve rod sealing grease composition and preparation method thereof

A composition and rod-shaped technology, applied in the direction of lubricating composition, petroleum industry, etc., can solve the problems that affect the rapid and sensitive opening and closing of blowout preventers and gate valves, are easily dissolved by oil and gas, diluted, and cannot meet the requirements of high temperature, etc. Achieve the effects of excellent chemical stability, excellent thermal stability, and excellent low temperature performance

Active Publication Date: 2021-03-26
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

[0006] 1) The low temperature performance is poor, which affects the rapid and sensitive switching of the blowout preventer and gate valve during winter in the northern region;
[0007] 2) The ability to resist medium corrosion is poor, and it is easily dissolved and diluted by oil and gas;
[0008] 3) Poor sealing and pressure resistance, resulting in poor sealing of the valve stem;
[0009] 4) The high temperature performance does not meet the requirements, and it is easy to be lost;
[0010] Regarding the low temperature valve stem sealant, there is no relevant literature report

Method used

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  • Low-temperature rodlike valve rod sealing grease composition and preparation method thereof
  • Low-temperature rodlike valve rod sealing grease composition and preparation method thereof
  • Low-temperature rodlike valve rod sealing grease composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A low-temperature rod-shaped valve stem sealing grease composition, the preparation method of which is:

[0037] 1) Add 43.5 parts of methyl silicone oil (V25=15000mm 2 / s) and 5 parts of polymethyl methacrylate (V100=1050mm 2 / s) into the reaction kettle in turn, heated and stirred to 90±5°C, stirred at constant temperature for 30±5 minutes to make the system uniformly dispersed, then added 2 parts of diphenyldihydroxysilane, and continued to heat up to 160±5°C, Slowly add 6 parts of fumed hydrophilic silica (specific surface area=200m 2 / g), then 20 parts of polyethylene wax (V149=85mm 2 / s), stirring at constant temperature for 60±5 minutes.

[0038] 2) After the constant temperature is over, add 5 parts of asbestos fiber, 15 parts of colloidal graphite, 3 parts of titanium dioxide and 0.5 part of T706 in sequence, stir and disperse for 45±5 minutes, then discharge the material into the barrel, and immediately pass through three-roller grinding Grind it once by m...

Embodiment 2

[0041] A low-temperature rod-shaped valve stem sealing grease composition, the preparation method of which is:

[0042] 1) First, 36.7 parts of methyl silicone oil (V25 = 12500mm 2 / s), 5 parts of polymethyl methacrylate (V100=1980mm 2 / s) and 2 parts of low molecular weight polyisobutylene (V100=2870mm 2 / s) into the reaction kettle in turn, heated and stirred to 90±5°C, stirred at constant temperature for 30±5 minutes to make the system uniformly dispersed, then added 3 parts of octyltrimethoxysilane, and continued to heat up to 160±5°C, Slowly add 8 parts of fumed hydrophilic silica (specific surface area=150m 2 / g), then 22 parts of polyethylene wax (V149=97mm 2 / s), stirring at constant temperature for 60±5 minutes.

[0043] 2) After the constant temperature is over, add 6 parts of asbestos fiber, 12 parts of colloidal graphite, 5 parts of titanium dioxide and 0.3 part of T561 in sequence, stir and disperse for 45±5 minutes, then discharge the material into the barrel...

Embodiment 3

[0046] A low-temperature rod-shaped valve stem sealing grease composition, the preparation method of which is:

[0047] 1) Add 33.8 parts of methyl silicone oil (V25=9500mm 2 / s) and 8 parts of low molecular weight polyisobutylene (V100=1030mm 2 / s) into the reaction kettle in turn, heating and stirring to 90±5°C, stirring at constant temperature for 30±5 minutes to make the system uniformly dispersed, then adding 3 parts of diphenyldihydroxysilane, and continuing to heat up to 160±5°C, Slowly add 9 parts of fumed hydrophilic silica (specific surface area=260m 2 / g), then 16 parts of polyethylene wax (V149=55mm 2 / s), stirring at constant temperature for 60±5 minutes.

[0048] 2) After the constant temperature is over, add 8 parts of asbestos fiber, 20 parts of colloidal graphite, 2 parts of titanium dioxide and 0.2 part of T551 in sequence, stir and disperse for 45±5 minutes, then discharge the material into the barrel, and immediately pass through three-roller grinding G...

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Abstract

The invention discloses a low-temperature rodlike valve rod sealant composition which comprises the following components in parts by weight: 18-67.4 parts of methyl silicone oil, 2-8 parts of tackifier, 2-10 parts of fumed silica, 0.5-5 parts of structure improver, 15-25 parts of polyethylene wax, 2-8 parts of asbestos fiber, 10-20 parts of colloidal graphite, 1-5 parts of titanium dioxide and 0.1-1 part of corrosion inhibitor. The invention further discloses a preparation method of the rodlike valve rod sealant composition. According to the invention, fumed silica is adopted to thicken methylsilicone oil, and the tackifier, the solid lubricant, the forming agent and the corrosion inhibitor are matched to prepare the rodlike valve rod sealant compound, so that the rodlike valve rod sealant composition has excellent low-temperature performance, good thermal stability and chemical stability, strong medium erosion resistance, excellent sealing performance, compression resistance, adhesion and wear resistance, and is non-toxic, non-sticky, plastic, non-cured and randomly formed.

Description

technical field [0001] The invention relates to the technical field of sealing lubricants, in particular to a low-temperature rod-shaped valve stem sealing grease 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/04C10N30/08C10N30/12
CPCC10M169/048C10M2229/041C10M2201/105C10M2205/14C10M2201/041C10M2201/062C10M2209/084C10M2205/026C10M2227/04C10M2215/223C10M2219/106
Inventor 邵聪吴超
Owner 武汉博达特种润滑技术有限公司
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