A kind of low temperature rod-shaped valve stem sealing grease composition and preparation method thereof

A composition and rod-shaped technology, which is applied in lubricating compositions, petroleum industry, etc., can solve problems affecting the rapid and sensitive switching of blowout preventer valves and gate valves, easy to be dissolved by oil and gas, dilution, poor sealing and pressure resistance, etc. Achieve excellent chemical stability, excellent thermal stability, good sealing effect

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

[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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  • A kind of low temperature rod-shaped valve stem sealing grease composition and preparation method thereof
  • A kind of low temperature rod-shaped valve stem sealing grease composition and preparation method thereof
  • A kind of low temperature rod-shaped valve stem sealing grease composition and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

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

[0037] 1) First put 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, heating and stirring to 90 ± 5 ° C, constant temperature stirring for 30 ± 5 minutes, to make the system dispersed evenly, then add 2 parts of diphenyldihydroxysilane, continue 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) were added 2 / s), constant temperature stirring 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 turn, stir and disperse for 45±5 minutes, then discharge the material into the barrel, and immediately grind it through three rollers Grind with...

Embodiment 2

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

[0042] 1) First put 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, heating and stirring to 90 ± 5 ° C, constant temperature stirring for 30 ± 5 minutes, to make the system evenly dispersed, then add 3 parts of octyltrimethoxysilane, continue 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) were added 2 / s), constant temperature stirring for 60±5 minutes.

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

Embodiment 3

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

[0047] 1) First put 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, constant temperature stirring for 30 ± 5 minutes, to make the system dispersed evenly, then add 3 parts of diphenyldihydroxysilane, continue 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) were added 2 / s), constant temperature stirring for 60±5 minutes.

[0048] 2) After the constant temperature is over, add 8 parts of asbestos fibers, 20 parts of colloidal graphite, 2 parts of titanium dioxide and 0.2 parts of T551 in turn, stir and disperse for 45±5 minutes, then discharge the material into a barrel, and immediately grind it through three rollers...

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Abstract

The invention discloses a low-temperature rod-shaped valve stem sealant composition, comprising the following components in proportion by weight: 18-67.4 parts of methyl silicone oil, 2-8 parts of a tackifier, and 2-10 parts of fumed silica , 0.5 to 5 parts of structure improver, 15 to 25 parts of polyethylene wax, 2 to 8 parts of asbestos fiber, 10 to 20 parts of colloidal graphite, 1 to 5 parts of titanium dioxide, and 0.1 to 1 part of corrosion inhibitor. The invention also discloses a preparation method of the rod-shaped valve stem sealant composition. The present invention adopts fumed silica to thicken methyl silicone oil, and is matched with a stick-shaped valve stem sealant compound made of a tackifier, a solid lubricant, a molding agent and a corrosion inhibitor, and has excellent low-temperature performance, good High thermal stability and chemical stability, strong resistance to medium corrosion, excellent sealing, pressure resistance, adhesion and abrasion resistance, and non-toxic, non-stick, plastic, non-curing, arbitrary molding.

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, 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. To en...

Claims

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Application Information

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Patent Type & Authority Patents(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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