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Wide-temperature-range urea-based shield tail sealing grease and preparation method thereof

A technology of shield tail sealing and wide temperature range, which is applied in the field of wide temperature range urea-based shield tail seal grease and its preparation, can solve the impact of research and development costs and quality control of shield tail seal grease for tunnel construction and propulsion efficiency , Shield tail sealing grease is greatly affected by temperature, shield tail sealing grease becomes thinner, etc., to achieve the effect of easy industrial production, good water pressure resistance and sealing performance, and reduce the amount of use

Active Publication Date: 2020-06-19
BEIJING MUNICIPAL CONSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most shield tail sealing greases currently on the market cannot meet the requirements of water pressure resistance, pumpability, adhesion, and corrosion resistance at the same time, and the shield tail sealing grease is greatly affected by temperature. In low temperature environments, The fluidity of the shield tail seal grease is affected by temperature, resulting in poor pumpability; under high temperature environment, the shield tail seal grease will become thinner, the fluidity will become larger, and the water resistance will be poor.
Therefore, at present, domestic shield tail sealing grease generally has two formulas in winter and summer, which has a great impact on the construction of tunnel construction projects, propulsion efficiency, and research and development costs and quality control of shield tail sealing grease.

Method used

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  • Wide-temperature-range urea-based shield tail sealing grease and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The shield tail sealing grease of the shield machine in the present embodiment has the following components and parts by weight: 10 parts of urea-based resin, 50 parts of calcium carbonate, 10 parts of calcium-based bentonite, 10 parts of gear oil B, and 5 parts of sodium-based grease , cellulose fiber 5 parts

[0030] Preparation:

[0031] Step A: Weigh 80 parts of PTMG1000, add to a three-necked flask, and slowly heat to 110-120°C under stirring;

[0032] Step B: dehydration, then lower the temperature to 50°C, add 32 parts of TDI, and raise the temperature to 85°C for 3h;

[0033] Step C: Add 29 parts of ALT402 latent curing agent, 1 part of leveling agent, and 0.5 part of defoamer, stir rapidly and vacuum defoam for 40 minutes, and discharge to obtain a single-component polyurea resin with a mass fraction of NCO of 6%.

[0034] Step D: put gear oil, cellulose fiber, and sodium-based grease into the kneader, heat up to 80-100°C under stirring conditions, keep const...

Embodiment 2

[0038] The shield tail sealing grease of the shield machine in the present embodiment has the following components and parts by weight: 15 parts of urea resin, 40 parts of calcium carbonate, 10 parts of sodium bentonite, 10 parts of 150SN mineral oil, and 5 parts of sodium grease parts, cellulose fiber 5 parts

[0039] Preparation:

[0040] Step A: Weigh 80 parts of PTMG1000, add to a three-necked flask, and slowly heat to 110-120°C under stirring;

[0041] Step B: dehydration, then lower the temperature to 50°C, add 40 parts of HMDI, heat up to 85°C for 3h;

[0042] Step C: Add 26 parts of ALT402 latent curing agent, 1 part of leveling agent, and 0.5 part of defoamer, stir rapidly and vacuum defoam for 40 minutes, and discharge to obtain a single-component polyurea resin with a mass fraction of NCO of 6%.

[0043] Step D: put 150SN mineral oil, cellulose fiber, and sodium-based grease into the kneader, heat up to 80-100°C under stirring conditions, keep constant temperature...

Embodiment 3

[0047] The shield tail sealing grease in the present embodiment has the following components and parts by weight: 20 parts of urea-based resin, 40 parts of calcium carbonate, 10 parts of sodium bentonite, 10 parts of ester synthetic oil, lithium-based grease 5 parts, wood fiber 5 parts

[0048] Preparation:

[0049] Step A: Weigh 80 parts of PTMG1000, add to a three-necked flask, and slowly heat to 110-120°C under stirring;

[0050] Step B: dehydration, then lower the temperature to 50°C, add 42 parts of IPDI, heat up to 85°C for 3h;

[0051] Step C: Add 30 parts of latent curing agent, 1 part of leveling agent, and 0.5 part of defoamer, stir rapidly and vacuum defoam for 40 minutes, and discharge to obtain a one-component polyurea resin with a mass fraction of NCO of 6%.

[0052]Step D: put ester synthetic oil, wood fiber, and organic grease into the kneader, heat up to 80-100°C under stirring conditions, keep constant temperature until completely mixed evenly, then stop st...

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Abstract

The invention discloses a wide-temperature-range urea-based shield tail sealing grease and a preparation method thereof. The wide-temperature-range ureido shield tail sealing grease is prepared from the following components in parts by weight: 10 to 25 parts of base oil, 10 to 30 parts of a urea-based resin, 5 to 15 parts of lubricating grease, 35 to 70 parts of a powdery filler and 3 to 5 parts of fiber. The wide-temperature-range urea-based shield tail sealing grease has the characteristics that (1) the wide-temperature-range urea-based shield tail sealing grease is suitable for being used under a wide temperature range condition, and the pumping capacity is slightly changed along with the temperature; (2) the water-pressure-resistant sealing performance is good, and when water leakage and slurry leakage occur, the latent curing agent in grease reacts with water molecules to form a waterproof layer film, so that the sealing and leaking stoppage effects are achieved; and (3) the components are simple, the performance is stable, no toxicity or corrosion exists, and environmental friendliness is achieved.

Description

technical field [0001] The invention relates to a sealing grease and a preparation method thereof, in particular to a wide temperature range urea-based shield tail sealing grease and a preparation method thereof. Background technique [0002] With the rapid development of the times, in order to meet the needs of urbanization, tunnel construction projects have increased. At present, the construction of underground tunnels and subway projects mainly uses shield technology. The shield method has less impact on the surrounding environment, etc. It is unique in the field of tunnel construction due to its unique advantages. However, in shield construction, shield tail sealing is a key link, which can affect whether the shield machine can advance smoothly, and even affect the safety of construction. The shield tail grease is used as the sealing material for the shield tail when the shield machine is excavating. It can effectively prevent groundwater and mud from entering the shiel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/06C08G18/48C08G18/42C10N30/08
CPCC10M169/06C08G18/48C08G18/42C10M2201/062C10M2201/103C10M2209/12C10M2217/045C10M2209/102C10M2207/40C10M2205/024
Inventor 郭飞孔恒姜瑜张丽丽胡嵩张旭光李永生赵欣徐鹏飞张春发赵晨阳高胜雷田治州孙博通张亚珍王璐刘雷廷户迁迁
Owner BEIJING MUNICIPAL CONSTR
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