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Polycarbonate diol and preparation method thereof

A polycarbonate diol and carbonate technology, applied in the directions of products, educts, reagents, etc., can solve the problems of few fields, low sales, and difficulty in precise control of the molecular weight of polycarbonate diols, so as to reduce waste and increase molecular weight. , Broaden the effect of the application

Active Publication Date: 2022-07-05
佛山市中天融新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the current industrial production, due to the harsh and complex conditions of transesterification in the transesterification method, it is extremely difficult to accurately control the molecular weight of polycarbonate diols, and there will be the appearance of polycarbonate diols with low molecular weight. These low molecular weight polycarbonate diols Polycarbonate diols can be used in fewer fields and sales are low

Method used

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preparation example Construction

[0045] The present invention provides a preparation method of polycarbonate diol.

[0046] The technical solution is:

[0047] A preparation method of polycarbonic glycol, comprising the following steps:

[0048] Using polyol and carbonate as main raw materials, through transesterification polycondensation reaction, the crude product of polycarbonate diol is prepared;

[0049] Collect the polycarbonate diol crude product with a molecular weight of 600-1100;

[0050] The polycarbonate diol crude product with a molecular weight of 600-1100, an organic dibasic acid and a dehydrating agent are mixed, stirred and reacted, and suction filtered to prepare the polycarbonate diol.

[0051] In the process of preparing polycarbonate diol by transesterification, the invention collects the crude product of polycarbonate diol with low molecular weight (600-1100), and adds organic dibasic acid and dehydrating agent to make it expand. chain, increase the molecular weight, and at the same tim...

Embodiment 1

[0088] The present embodiment provides a polycarbonate diol and a preparation method thereof, the steps are as follows:

[0089] step 1)

[0090] 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 internal system is reduced to 100Pa~10000Pa, and then the temperature is maintained at 160°C. Under this pressure and temperature, the reaction of vacuum distillation (ie the second st...

Embodiment 2

[0098] The present embodiment provides a polycarbonate diol and a preparation method thereof, and the specific steps are as follows:

[0099] step 1)

[0100] 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, and then the temperature in the reaction kettle was increased isostatically until the temperature was 160 ° C, and the atmospheric distillation reaction (ie the first stage reaction) was carried out for 6.5 hours; 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...

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Abstract

The invention relates to the technical field of fine chemicals, in particular to a polycarbonate diol and a preparation method thereof. The preparation method of the polycarbonate diol includes the following steps: using polyol and carbonate as main raw materials, through transesterification polycondensation reaction, to prepare a crude product of the polycarbonate diol; collecting polycarbonate with a molecular weight of 600-1100 Diol crude product; mixing polycarbonate diol crude product with molecular weight of 600-1100, organic dibasic acid and dehydrating agent, stirring reaction, suction filtration, to prepare polycarbonate diol. The preparation method of the invention can increase the molecular weight of the low molecular weight polycarbonate diol crude product within a controllable range, thereby meeting application requirements.

Description

technical field [0001] The invention relates to the technical field of fine chemicals, in particular to polycarbonate diol and a preparation method thereof. Background technique [0002] Polycarbonate diol (PCDL) is a polymer with multiple carbonate groups in the molecule and hydroxyl groups at both ends of the molecule. Compared with polyurethane synthesized by polyol and polyether polyol, polycarbonate polyurethane has excellent mechanical properties, hydrolysis resistance, heat resistance, oxidation resistance and light resistance. Therefore, polycarbonate diol is considered to be a polyol with the best performance at present, and is widely used in the preparation of various polyurethane materials with excellent quality and performance. [0003] In the traditional production process of polycarbonate diol, there are phosgene method, cyclic carbonate ring-opening polymerization method, carbon dioxide and epoxide copolymerization method and transesterification method. Amon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/30C08G64/42C08G18/44
CPCC08G64/305C08G64/42C08G18/44Y02P20/141
Inventor 许阳宾杨武彬黄绍源陈永强
Owner 佛山市中天融新材料科技有限公司
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