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Polyurethane chemical grouting material and production method

A kind of polyurethane chemistry and polyurethane technology, which is applied in the direction of building insulation materials, building components, sea area engineering, etc., can solve the problems of high cost, loose signs, insufficient water content of water-soluble polyurethane, etc., and achieve the effect of simple construction and convenient operation

Active Publication Date: 2008-07-16
TIANJIN TIANDA TIANHAI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Roughly divided into two types: (1) Oil-soluble (hydrophobic type) (2) Water-soluble (hydrophilic type); Disadvantages: 1) Sometimes there are signs of shrinkage and looseness after plugging
2) The gel sometimes has poor flexibility
3) The cost is slightly higher
4) Insufficient water content in water-soluble polyurethane

Method used

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  • Polyurethane chemical grouting material and production method
  • Polyurethane chemical grouting material and production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Preparation of hydroxyl-terminated polyurethane prepolymer

[0058] Pump 900 parts of hydrophilic polyether with a molecular weight of 1000 and a hydroxyl value of 168mg KOH / g into the reactor, and take samples to measure the moisture content by the Karl Fischer method. 2h until the moisture is qualified), start stirring, add accurately measured 111 parts of MDI, stir for 30min and then heat up, keep the constant temperature at 45°C for 1h, then continue to heat up to 80°C, and keep for 3.5h. Detect the -NCO content therein, and stop the reaction when there is almost no (indicating that the MDI is completely capped). Cool to room temperature (25°C), and keep sealed until use.

[0059] (2) Preparation of hydrophilic polyurethane prepolymer

[0060] Pump 480 parts of hydrophilic polyether with a molecular weight of 4000 and a hydroxyl value of 42 mg KOH / g into the reactor, and use Karl’s law to determine the water content. 2h until the moisture is qualified), add 2...

Embodiment 2

[0064] (1) Preparation of hydroxyl-terminated polyurethane prepolymer

[0065] Pump 800 parts of hydrophilic polyether with a molecular weight of 1000 and a hydroxyl value of 168mg KOH / g into the reactor, and take samples to measure the moisture content by the Karl Fischer method. 2h until the moisture is qualified), start stirring, add 99 parts of MDI accurately measured, stir for 30min and then heat up, keep the constant temperature at 50°C for 1h, then continue to heat up to 85°C, and keep for 4.0h. Detect the -NCO content therein, and stop the reaction when there is almost no (indicating that the MDI is completely capped). Cool to room temperature (25°C), and keep sealed until use.

[0066] (2) Preparation of hydrophilic polyurethane prepolymer

[0067] Pump 450 parts of hydrophilic polyether with a molecular weight of 4000 and a hydroxyl value of 42 mg KOH / g into the reactor, and use Karl’s law to determine the water content. 2h until the moisture is qualified), add 24...

Embodiment 3

[0071] (1) Preparation of hydroxyl-terminated polyurethane prepolymer

[0072] Pump 812 parts of polyethylene glycol with a molecular weight of 400 into the reaction kettle, start stirring at room temperature and add 250 parts of MDI accurately measured, and heat up after stirring for 30 minutes. Keep the constant temperature at 48°C for 1h, then continue to raise the temperature to 82°C, keep it for 3.75h, detect the -NCO content in it, and stop the reaction when there is almost no (at this time MDI is completely blocked). Cool to room temperature (25°C), and keep sealed until use.

[0073] (2) Preparation of hydrophilic polyurethane prepolymer

[0074] Pump 550 parts of hydrophilic polyether with a molecular weight of 3500 and a hydroxyl value of 51 mg KOH / g into the reactor, and take samples to measure the moisture content using Karl's law. 2h until the moisture is qualified), add 198 parts of the hydroxyl-terminated prepolymer prepared by the above reaction, and stir eve...

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Abstract

The invention provides a polyurethane chemical grouting material and a preparation method thereof. At first a hydroxyl-terminated polyurethane prepolymer is prepared: hydrophilic polyol or small molecular polyether and isocyanate are mixed and stirred at normal temperature, and heating and heat preservation processes, etc. are carried, and when -NCO percent is detected to be near zero by central control, the reaction is stopped, and the hydroxyl-terminated polyurethane prepolymer is prepared. Secondly, the hydrophilic polyurethane prepolymer is prepared: the macromolecular polyether and the hydroxyl-terminated polyurethane prepolymer prepared through the reaction are stirred and mixed evenly in a stirring reaction kettle which is provided with a condenser. At normal temperature, isocyanate is added into the kettle for stirring and heating and heat preservation processes, etc. are carried out; -NCO percent is detected, and the reaction is stopped when the -NCO percent is between 5.6 percent and 6.0 percent. Lastly the polyurethane grouting material is prepared: a diluting agent is added into the prepared polyurethane prepolymer, and the stirring process is started; foam stabilizer, polyurethane special catalyst and plasticizer are added into the prepolymer at the same time. The mono liquid grouting of the polyurethane chemical grouting material of the invention has simple construction, easy operation, and gel is nonpoisonous, and can be used for water shutoff of water supply lines, etc.

Description

technical field [0001] The invention belongs to waterproof plugging technology, and provides a polyurethane chemical grouting material and a preparation method. Background technique [0002] Before the 19th century, grouting materials encountered water leakage problems in shipbuilding, construction and other projects, but it was difficult to solve them by conventional methods, so clay, cement, tree sap glue, etc. were used to make solutions, and grouting was used. called grouting material. [0003] With the development of science and the needs of construction projects, it has developed from silicate (water glass), calcium chloride, chrome-lignin to polymer chemical grouting materials. After the 1950s, urea-formaldehyde resins, phenolic resins, "formaldehyde resins" (polymethacrylates), "acrylamides" (polyacrylamides and acrylates), epoxy resins, and "cyanide resins" appeared successively. (polyurethane) and other chemical grouting materials. Both can effectively block wat...

Claims

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Application Information

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IPC IPC(8): C08L75/06C08K5/12C08G18/76C08G18/48C08G18/10E04B1/68E01C11/04E02B3/16
Inventor 孙宝利艾文才李亚军
Owner TIANJIN TIANDA TIANHAI NEW MATERIAL
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