Polycarbonate diol and preparation method thereof
A polycarbonate dicarbonate technology, applied in the direction of products, educts, reagents, etc., can solve the problems of few fields, difficult to accurately control the molecular weight of polycarbonate diols, and low sales volume, so as to reduce waste and broaden applications , the effect of increasing the molecular weight
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[0043] The present invention provides a preparation method of polycarbonate diol.
[0044] The technical solution is:
[0045] A preparation method of polycarbonic glycol, comprising the following steps:
[0046] Using polyol and carbonate as main raw materials, through transesterification polycondensation reaction, the crude product of polycarbonate diol is prepared;
[0047] Collect the polycarbonate diol crude product with a molecular weight of 600-1100;
[0048] The polycarbonate diol crude product with the molecular weight of 600-1100 and the diisocyanate are mixed, and the reaction is stirred to prepare the polycarbonate diol.
[0049]In the process of preparing polycarbonate diol by transesterification, the present invention collects the crude product of polycarbonate diol with low molecular weight (600-1100), and adds diisocyanate to extend the chain and increase the molecular weight. At the same time, it can also ensure that the performance of the polycarbonate dio...
Embodiment 1
[0083] The present embodiment provides a polycarbonate diol and a preparation method thereof, the steps are as follows:
[0084] step 1)
[0085] The initial temperature of the reaction kettle was set at 95°C, the pressure in the reaction kettle was normal pressure, and in terms of the amount of matter, 100 parts of 1,4-butanediol and dimethyl carbonate were successively put into the reaction kettle after the above-mentioned preset temperature. 120 parts and 1.5 parts of catalyst sodium methoxide, then the temperature in the reaction kettle was increased isocratically, the temperature was raised to 160 ° C, and the atmospheric distillation reaction (ie the first stage reaction) was carried out for 6.5 h; after the above reaction was completed, the reaction kettle was The negative pressure of the inner system is reduced to 100Pa~10000Pa, and then the temperature is maintained at 160°C. Under this pressure and temperature, the vacuum distillation reaction (ie the second stage re...
Embodiment 2
[0093] The present embodiment provides a polycarbonate diol and a preparation method thereof, and the specific steps are as follows:
[0094] step 1)
[0095] The initial temperature of the reaction kettle was set to 95°C, the pressure in the reaction kettle was normal pressure, and in terms of the amount of matter, 100 parts of 1,6-hexanediol, dimethyl carbonate were successively put into the reaction kettle after the above-mentioned preset temperature. 120 parts and 1.5 parts of catalyst sodium methoxide, then the temperature in the reaction kettle was increased isocratically, the temperature was raised to 150 ° C, and the atmospheric distillation reaction (ie the first stage reaction) was carried out for 6.5 h; after the above reaction was completed, the reaction kettle was The negative pressure of the system is reduced to 100Pa ~ 10000Pa, and then the temperature is maintained at 160°C. Under this pressure and temperature, the vacuum distillation reaction (ie the second st...
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