A kind of polyisocyanate composition with low moisture absorption rate and preparation method thereof
A polyisocyanate and isocyanurate technology, applied in the field of isocyanates, can solve problems such as unmentioned storage stability, and achieve the effect of improving the moisture absorption rate
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Embodiment 1
[0112] 1000 g of mXDI was placed in a round bottom flask equipped with a reflux condenser, stirrer, thermometer and nitrogen inlet.
[0113] The above reaction system was heated to 50°C to start the reaction. Under nitrogen protection conditions, a 60wt% n-hexanol (D1) solution of tetrabutylammonium fluoride was prepared, and the catalyst was continuously stirred during the dropwise addition of the catalyst. The amount of catalyst added was based on the mass of diisocyanate When the conversion rate of mXDI monomer is 25%, immediately add dibutyl phosphate in an equimolar amount to the catalyst to terminate, and obtain a reaction liquid, and the reaction time is 7.5 hours.
[0114] 0.05% isopropanol (D2) by mass of the reaction liquid was added to the reaction liquid, and the stirring reaction was continued at 90° C. for 30 min.
[0115] The obtained reaction solution was evaporated to remove unreacted monomers under the conditions of a temperature of 150° C. and an absolute pr...
Embodiment 2
[0117] 1000 g of mXDI was placed in a round bottom flask equipped with a reflux condenser, stirrer, thermometer and nitrogen inlet.
[0118] Heat the above reaction system to 60°C to start the reaction. Under the condition of nitrogen protection, prepare 2-ethyl-1,3-hexanediol (D1) solution of 60wt% benzyltrimethylammonium fluoride, and add the catalyst dropwise Stir continuously, the amount of catalyst added is 0.03% based on the mass of diisocyanate, when the mXDI monomer conversion rate is 30%, immediately add diisooctyl phosphate in an equimolar amount to the catalyst to terminate, and obtain a reaction liquid, and the reaction time is 6h.
[0119] Add 0.07% tert-butanol (D2) to the reaction liquid, and continue to stir and react at 90° C. for 30 min.
[0120] The obtained reaction solution was evaporated to remove unreacted monomers with a thin-film evaporator under the conditions of temperature 140° C. and absolute pressure 80 Pa, and the monomer content was 0.2 wt%. A ...
Embodiment 3
[0122] 1000 g of mXDI was placed in a round bottom flask equipped with a reflux condenser, stirrer, thermometer and nitrogen inlet.
[0123] The above reaction system was heated to 70°C to start the reaction. Under nitrogen protection conditions, a 1,3-butanediol (D1) solution of 50wt% tetramethylammonium fluoride was prepared, and the catalyst was continuously stirred during the dropping process. The amount of the catalyst added was Based on 0.07% of the mass of diisocyanate, when the mXDI monomer conversion rate is 35%, dibutyl phosphate is added in an equimolar amount to the catalyst to terminate immediately, to obtain a reaction liquid, and the reaction time is 5 hours.
[0124] Then add n-hexanol (D2) of 0.08% by mass of the reaction solution into the reaction solution, and continue to stir and react at 90° C. for 30 min.
[0125] The obtained reaction solution was evaporated to remove unreacted monomers under the conditions of a temperature of 130° C. and an absolute press...
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