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
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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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