A kind of high and low temperature resistant siloxane vacuum grease composition and its preparation method

A lubricating grease composition, high and low temperature resistance technology, applied in the direction of lubricating composition, petroleum industry, thickener, etc., can solve the problems of storage and vacuum sealing performance reduction, unexplained silica powder, etc., to achieve improved compatibility properties, excellent long-term storage stability, and good compatibility

Active Publication Date: 2016-02-03
SUZHOU HUIFENG LUBRICANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Silica powder is used as a thickening agent in the above published patents. In fact, these silica powder raw materials are due to processing and production, resulting in a slightly acidic silica product (pH value is 3.7-4.7), However, there is no description in the literature that the silica powder is treated with high temperature or other methods to make the silica powder neutral
Therefore, these silicone greases generally undergo quality changes during long-term storage and / or use, resulting in a reduction in their storage and vacuum-tight performance

Method used

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  • A kind of high and low temperature resistant siloxane vacuum grease composition and its preparation method
  • A kind of high and low temperature resistant siloxane vacuum grease composition and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Put 135Kg of trimethyl-terminated polymethylphenylsiloxane oil into the equipment container, heat and stir, and when the temperature is at 120°C, add 14.25Kg of silicon dioxide powder that has been modified by a surface covering agent, Stir and mix continuously for 2 hours, then cool, grind twice, then add 0.75Kg of functional additives, mix for 0.5h, go through vacuum degassing treatment, and finally grind twice again to get the grease. The consistency of the grease was measured after storage for 12 months and a change of 0.8% was determined, demonstrating the long-term stability of the grease.

Embodiment 2

[0037] Put 136.5Kg of trimethyl-capped polydimethylsiloxane oil into the equipment container, heat and stir, and when the temperature is at 130°C, add 12.3Kg of silica powder modified by a surface covering agent, Stir and mix continuously for 3 hours, then cool, grind twice, then add 1.2Kg of functional additives, mix for 1 hour, go through vacuum degassing treatment, and finally grind twice again to get the grease. The consistency of the grease was measured after storage for 12 months and a 1.0% change was determined, demonstrating the long-term stability of the grease.

Embodiment 3

[0039] Put 142.4Kg of silanol-terminated polydimethylsiloxane oil into the equipment container, heat and stir, and when the temperature is at 140°C, add 14.4Kg of silicon dioxide powder that has been modified by a surface covering agent, continuously Stir and mix for 1.5 hours, then cool, grind twice, then add 3.2Kg of functional additives, mix for 0.5 hours, then undergo vacuum degassing, and finally grind twice again to obtain the grease. The consistency of the grease was measured after storage for 12 months and a change of -0.9% was determined, which proves the long-term stability of the grease.

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Abstract

The invention relates to a high and low temperature resistant siloxane vacuum grease composition and its preparation method. The high and low temperature resistant siloxane vacuum grease composition is used for lubrication and sealing of high-low temperature vacuum systems and high-low temperature vacuum valves, and comprises the following components by weight: 84-93% of organosilicon polymer oil, 3-15% of silicon dioxide powder, 0.5-7% of a surface covering agent, and 0.05-2.0% of an additive. The high and low temperature resistant siloxane vacuum grease composition has excellent sealing performance and long-term storage stability, and at the same time has good compatibility with a contact surface, high and low temperature performance, adhesion performance, chemical inertness, and water resistance. The high and low temperature resistant siloxane vacuum grease composition can be used for lubrication and sealing of high vacuum systems, sealing of glass valves, ceramic ground joints, pistons, and faucets, as well as sealing elements of air pressure valves, vacuum equipment and pneumatic brakes, etc.

Description

technical field [0001] The invention belongs to the technical field of industrial vacuum systems, and in particular relates to a high and low temperature resistant siloxane vacuum lubricating grease composition for lubricating and sealing high and low temperature vacuum systems and high and low temperature vacuum valves and a preparation method thereof. Background technique [0002] With the development of modern science and technology, people's requirements for the use of grease are getting higher and higher. Since silicone grease is a special grease, people have proposed a lot about silicone grease, for example, in China The published patent No. CN101240211 describes the preparation of a silicone grease containing a viscous liquid (such as silicone oil) and a solid thickener (such as silicon dioxide powder). Chinese published patent No. CN1687334 describes the preparation of a lubricant containing a viscous liquid (such as polyolefin) and silicon dioxide powder. Chinese p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M169/00C10M113/16C10N50/10C10N40/34
Inventor 诸国建黄后权惠泽民邱惠娟叶敏那
Owner SUZHOU HUIFENG LUBRICANT
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