Polyurethane prepolymer, polyurethane grouting material and preparation method thereof

A polyurethane prepolymer, grouting material technology, applied in chemical instruments and methods, other chemical processes and other directions, can solve problems such as difficulty in taking into account environmental protection, high foaming rate and shrinkage resistance at the same time, and achieve a wide range of applications and prospects, Reduced packaging costs, environmental and human toxicity

Inactive Publication Date: 2011-06-15
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the defects that the existing polyurethane grouting materials are difficult to take into account environme

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1. The preparation method of polyurethane prepolymer: the reaction is carried out in a glass reactor equipped with a stirrer, a thermocouple thermometer and a calcium chloride drying tube.

[0047] The specific operation is: put 30 grams of N-204 polyether (diol with a number average molecular weight of 400) into the reactor, raise it to 100±2°C, stir, vacuumize and dehydrate for 3 hours, and then cool down to 40±2°C , then add 180 grams of PAPI and 20 grams of MDI-100 (the molar ratio of -NCO in the organic polyisocyanate compound to -OH in the organic polyhydroxy compound is 10:1), react at 80 ± 2 ° C for 2 hours, and cool to 40 ℃ to obtain 230 grams of polyurethane prepolymer.

[0048] 2. Preparation of polyurethane grouting material: Add the compound package prepared in advance to the above polyurethane prepolymer, including 1.3 grams of triethylenediamine, 7.5 grams of Tween 60, 0.23 grams of phosphoric acid, 20 grams of DOP, and 7.59 grams of xylene And 20 grams ...

Embodiment 2

[0050] One, the preparation method of polyurethane prepolymer: in the same glass reactor as embodiment 1, 40 grams of EP-330N polyether (the polyether trihydric alcohol that the number average molecular weight is 5000) is dropped into reactor, rises to 100 ±2°C, stirring, vacuum dehydration and degassing for 3 hours, after cooling down to 40±2°C, add 150 grams of PAPI, 10 grams of MDI-100 and 30 grams of carbodiimide modified MDI 5412 (in organic polyisocyanate compounds - The molar ratio of NCO to -OH in the organic polyhydroxy compound is 15:1), react at 80±2° C. for 2 hours, cool down to 40° C. to obtain 230 grams of polyurethane prepolymer.

[0051] 2. Preparation of polyurethane grouting material: Add the compound package prepared in advance to the above polyurethane prepolymer, including 2 grams of dimethylbenzylamine, 7.5 grams of Tween 80, 0.23 grams of benzoyl chloride, 20 grams of DOP, 5.5 gram of dichloromethane and 30 grams of acetone, stirred to obtain a stable tr...

Embodiment 3

[0053] One, the preparation method of polyurethane prepolymer: in the glass reactor identical with embodiment 1, with 40 grams of DL-2000 polyether (number-average molecular weight is the glycol of 2000) and 4.5 grams of 1,4 butanediol Put it into the reaction kettle, raise it to 100±2°C, stir, vacuumize and dehydrate and degas for 3 hours, after cooling down to 40±2°C, add 170 grams of PAPI and 30 grams of MDI-100 (-NCO in organic polyisocyanate compound and organic The molar ratio of -OH in the polyhydroxy compound is 10.5:1), reacted at 80±2° C. for 2 hours, cooled to 40° C. to obtain 244.5 grams of polyurethane prepolymer.

[0054] 2. Preparation of polyurethane grouting material: Add the compound package prepared in advance to the above polyurethane prepolymer, including 1 gram of triethylenediamine, 0.2 gram of dibutyltin dilaurate, 7.5 gram of Tween 80, 0.5 gram of phosphoric acid, 25 grams of DOP, 5.2 grams of xylene, 30 grams of acetone, stir until a stable transparen...

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Abstract

The invention relates to a preparation method of a polyurethane prepolymer, which comprises: mixing polyisocyanate and an organic polyol compound for reaction, wherein the molar ratio of the -NCO in the polyisocyanate and the -OH in the organic polyol compound is (4-15):1; the polyisocyanate is two or more of polymethylene polyphenyl isocyanate (PAPI), methylene diphenyl diisocyanate (MDI) and carbodiimide modified MDI 5412; and the organic polyol compound comprises one or more of polyether glycol with functionality of 2 to 4 and number-average molecular weight of 300 to 5,000, polyester polyol and polyether-polyester polyol. The invention also relates to the polyurethane prepolymer and a polyurethane grouting material. The polyurethane grouting material is a single-component grouting material, has little toxicity to the environment and construction personnel and can well improve foaming rate and anti-contraction performance; during packaging, the need of independent packaging of a catalyst is obviated, so the packaging cost is lowered; and the material is more convenient to use and transport and has a more wide application range and a bright prospect.

Description

technical field [0001] The invention relates to a method for preparing a polyurethane prepolymer, the polyurethane prepolymer obtained by the method and a polyurethane grouting material. Background technique [0002] We can often find many water leakage phenomena from tunnels, underground passages and various types of building structures. However, generally (traditional) the water leakage is opened into a V-Cut shape, and the surface is covered with quick-setting cement and other materials. Covering, sealing and sealing, however, this type of construction method often only achieves a blocking effect of 5 to 10 cm on the surface, but cannot achieve a certain degree of deep filling and water sealing, and will reappear after a period of time A secondary or tertiary leak occurs. This is because the groundwater flowing out from the soil and the site outside the tunnel or structure flows out through cracks, secondary joints, mud-packed places or honeycombs, etc. If the water-stop...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/48C08G18/42C08G18/10C08G18/66C08L75/06C08L75/08C09K3/12
Inventor 于鹏程王振波董建国杜辉马立青
Owner SHANGHAI DONGDA CHEM
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