Low temperature resistant shield tail sealing grease and preparation method thereof

A shield tail sealing, low temperature resistance technology, applied in the direction of lubricating composition, etc., can solve the problems of large influence of temperature fluctuation, reduce shield tail sealing effect, increase grease hardness, etc., to improve low temperature fluidity, broad application prospects, The effect of excellent low temperature resistance

Active Publication Date: 2021-08-31
中铁建华南建设(广州)高科技产业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among them, the shield tail sealing grease is the core material of the shield tail seal. The main raw materials of the shield tail sealing grease are greatly affected by temperature fluctuations. Especially at low temperatures, the hardness of the grease increases, loses its proper elasticity, and weakens the sealing performance. This will greatly reduce the sealing effect of the shield tail, thus affecting the normal construction and excavation

Method used

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  • Low temperature resistant shield tail sealing grease and preparation method thereof
  • Low temperature resistant shield tail sealing grease and preparation method thereof
  • Low temperature resistant shield tail sealing grease and preparation method thereof

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preparation example Construction

[0077] The present invention also provides a method for preparing the above-mentioned low-temperature-resistant shield tail sealing grease, comprising the following steps:

[0078] The base oil, plasticizer, pour point depressant and auxiliary agent are mixed.

[0079] In one of the embodiments, the preparation method of the above-mentioned low temperature resistant shield tail sealing grease comprises the following steps:

[0080] The base oil, thickener, tackifier, plasticizer, pour point depressant, filler, fiber and lubricant are mixed.

[0081] In one of the embodiments, the above-mentioned low-temperature-resistant shield tail sealing grease is mixed with the base oil, thickener, tackifier, plasticizer, pour point depressant, and filler under stirring at 40°C to 80°C , fibers and lubricants are mixed.

[0082] Preferably, the preparation method of the low temperature resistant shield tail sealing grease comprises the following steps:

[0083] Add a pour point depressa...

Embodiment 1

[0092] This embodiment provides a low temperature resistant shield tail sealing grease and a preparation method thereof.

[0093] (1) In terms of mass percentage, the composition of low temperature resistant shield tail seal grease 1 is as follows:

[0094] Base oil 150SN 15%, polymethacrylate (kinematic viscosity at 100°C is 400mm 2 / s; the degree of pour point reduction for base oil is 16) 0.2%, and the kinematic viscosity of polyisobutylene (100°C) is 230mm 2 / s) 7%, liquid rosin resin (kinematic viscosity at 100°C is 250mm 2 / s) 4%, dioctyl oxalate 5%, industrial petrolatum 1%, organic bentonite 5%, lignocellulose (length 1mm ~ 2mm) 5.5%, light calcium carbonate 42%, 2# lithium base grease 15.3 %.

[0095] (2) Preparation of low temperature resistant shield tail seal grease 1:

[0096] Set the temperature of the kneader to 60°C, add base oil 150SN to it, and add polymethacrylate while stirring to prepare mixture A;

[0097] Set the temperature of the kneader to 70°C, ad...

Embodiment 2

[0105] This embodiment provides a low temperature resistant shield tail sealing grease and a preparation method thereof.

[0106] (1) In terms of mass percentage, the composition of low temperature resistant shield tail seal grease 2 is as follows:

[0107] Base oil 150SN 15%, polyethylene fumaric acid copolymer (kinematic viscosity at 100°C is 400mm 2 / s; the degree of pour point reduction for base oil is 18) 0.2%, and the kinematic viscosity of polyisobutylene (100°C) is 250mm 2 / s) 3%, guar gum (kinematic viscosity at 100°C is 250mm 2 / s) 8%, industrial petrolatum 3%, dioctyl phthalate 2%, organic bentonite 5.5%, lignocellulose (length 1mm ~ 2mm) 5.8%, light calcium carbonate 20%, talc 19.5%, 3# Lithium-based grease 6%, 2# Lithium-based grease 12%.

[0108] (2) Preparation of low temperature resistant shield tail seal grease 2:

[0109] Set the temperature of the kneader to 60°C, add base oil 150SN to it, and add polyethylene fumaric acid copolymer while stirring to pre...

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Abstract

The invention relates to a low-temperature resistant shield tail sealing grease and a preparation method thereof. The low temperature resistant shield tail sealing grease is prepared from the following raw materials in mass percentage: 12%-20% of base oil, 4%-13% of plasticizer, 0.05%-2% of pour point depressant and 65%-80% of auxiliary agent %; The kinematic viscosity of the pour point depressant at 100°C is 350mm 2 / s~450mm 2 / s; the pour point depressant has a pour point depressant of ≥16 for the base oil. The low-temperature-resistant shield tail sealing grease is very environmentally friendly and has excellent low-temperature resistance. At the same time, its core properties of water pressure resistance, pumpability, and water washout resistance are not affected, which can effectively improve the low-temperature use efficiency of the grease and expand the use temperature of the product. range, to solve the problem that the grease pump cannot pump grease during shield tunneling construction in winter, and to ensure the smooth progress of shield tunneling construction in winter.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a low-temperature resistant shield tail sealing grease and a preparation method thereof. Background technique [0002] The shield tail seal is a very important safety barrier to ensure that the shield machine is isolated from groundwater. The shield tail seal grease is one of the main materials of the shield tail seal link. It has sealing and lubricating functions, which can effectively protect the shield tail and isolate groundwater and groundwater. The mud ensures the smooth advancement of the shield; it also has the functions of anti-corrosion and anti-friction. [0003] Among them, the shield tail sealing grease is the core material of the shield tail seal. The main raw materials of the shield tail sealing grease are greatly affected by temperature fluctuations. Especially at low temperatures, the hardness of the grease increases, loses its proper elasticity, and weakens the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M169/04
CPCC10M169/048C10M2201/08C10M2201/105C10M2205/022C10M2205/024C10M2205/026C10M2207/126C10M2207/282C10M2207/285C10M2209/10C10M2209/12
Inventor 王静廖剑平王德军张磊
Owner 中铁建华南建设(广州)高科技产业有限公司
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