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 low sales volume, difficult to precisely control the molecular weight of polycarbonate diols, and few fields, so as to increase the molecular weight and broaden the application. , the effect of reducing waste

Active Publication Date: 2021-09-21
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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Examples

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Comparison scheme
Effect test

preparation example Construction

[0045] And the invention provides a kind of preparation method of polycarbonate diol.

[0046] The technical solution is:

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

[0048] Using polyols and carbonates as main raw materials, the crude product of polycarbonate diols is prepared through transesterification and polycondensation;

[0049] Collect the polycarbonate diol crude product with molecular weight at 600~1100;

[0050] Mix the crude polycarbonate diol with a molecular weight of 600-1100, an organic dibasic acid and a dehydrating agent, stir for reaction, and suction filter to prepare the polycarbonate diol.

[0051] In the process of preparing polycarbonate diols by transesterification, the present invention collects crude polycarbonate diols with lower molecular weight (600-1100), and expands them by adding organic dibasic acids and dehydrating agents. chain, increase the molecular weight, and at the same time, it can also ensu...

Embodiment 1

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

[0089] step 1)

[0090] Set the initial temperature of the reactor to 95°C, and the pressure in the reactor to normal pressure. In terms of the amount of substances, 100 parts of 1,4-butanediol, dimethyl carbonate, and 120 parts and 1.5 parts of catalyst sodium methylate, then increase the temperature in the reactor isocratically, to a temperature of 160°C, and carry out atmospheric distillation reaction (i.e. the first stage reaction) for 6.5h; after the above reaction is completed, the reactor The negative pressure of the internal system was reduced to 100Pa-10000Pa, and then the temperature was kept at 160°C. Under this pressure and temperature, the reaction was distilled under reduced pressure (ie, the second-stage reaction) for 7.5 hours to complete the transesterification polycondensation reaction and obtain the product intermediate.

[009...

Embodiment 2

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

[0099] step 1)

[0100] Set the initial temperature of the reactor to 95°C, and the pressure inside the reactor to normal pressure. In terms of the amount of substances, 100 parts of 1,6-hexanediol, dimethyl carbonate, and 120 parts and 1.5 parts of catalyst sodium methylate, then increase the temperature in the reactor isocratically, to a temperature of 160°C, and carry out atmospheric distillation reaction (i.e. the first stage reaction) for 6.5h; after the above reaction is completed, the reactor The negative pressure of the system was reduced to 100Pa~10000Pa, and then the temperature was kept at 160°C. Under the pressure and temperature, the vacuum distillation reaction (that is, the second stage reaction) was carried out for 8.5 hours to complete the transesterification polycondensation reaction and obtain the product intermediate.

[...

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Abstract

The invention relates to the technical field of fine chemical engineering, in particular to polycarbonate diol and a preparation method thereof. The preparation method of the polycarbonate diol comprises the following steps: taking polyol and carbonic ester as main raw materials, preparing a polycarbonate diol crude product through transesterification condensation polymerization; collecting a polycarbonate diol crude product with the molecular weight of 600 to 1100; and mixing a polycarbonate diol crude product with the molecular weight of 600-1100, organic dibasic acid and a dehydrating agent, and performing stirring reaction and suction filtration to prepare the polycarbonate diol. According to the preparation method disclosed by the invention, the molecular weight of the low-molecular-weight polycarbonate diol crude product can be increased in a controllable range, so that application requirements are met.

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 containing multiple carbonate groups in the molecule and hydroxyl groups at both ends of the molecule. It is a new type of multi-component compound that can be used to synthesize polyurethane with superior performance. It is different from traditional polyester Compared with polyurethanes synthesized from polyols and polyether polyols, polycarbonate polyurethanes have 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 good quality and excellent performance. [0003] In the traditional production process of polycarbona...

Claims

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Application Information

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Patent Type & Authority Applications(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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