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A kind of preparation method of polyether polyol with low degree of unsaturation, high activity and high molecular weight

A polyether polyol and high molecular weight technology is applied in the field of preparation of low unsaturation, high activity and high molecular weight polyether polyol, which can solve the problem of not being able to satisfy low unsaturation, high molecular weight and high activity at the same time, and achieve low unsaturation, high molecular weight and high activity. The effect of unsaturation value, uniform length and uniform distribution of EO

Active Publication Date: 2019-05-24
ZHEJIANG HUANGMA TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problem that low unsaturation, high molecular weight and high activity cannot be satisfied at the same time in the production of existing polyether polyols, this application provides a new method for preparing polyether polyols with low unsaturation, high molecular weight and high activity , this method is used in the preparation of polyether polyols, which has the advantages of low unsaturation, high molecular weight and high activity at the same time, expands the application field of polyether polyols, and endows products with high excellent performance

Method used

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  • A kind of preparation method of polyether polyol with low degree of unsaturation, high activity and high molecular weight

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Add 13.8g of glycerin and 3.22g of cesium hydroxide into the reaction kettle, replace the air in the kettle with nitrogen three times, then raise the temperature to 110-115°C, and keep the temperature for dehydration for 1h under the vacuum degree ≥-0.098MPa. Then 1062g of propylene oxide was added dropwise for reaction, the reaction temperature was controlled to be 110-115° C., and the pressure was less than 0.4 MPa. After the reaction of propylene oxide is completed, slowly add 150g of ethylene oxide dropwise, control the reaction temperature to 110-115°C, and the pressure to be less than 0.4MPa. After the pressure remains constant, the residual monomer is removed in a vacuum. Cool down to 50°C and discharge to obtain 1225g crude polyether polyol.

[0029] (2) Move the crude polyether polyol obtained above to a 2L four-neck flask, add 62g of deionized water and stir for 10 minutes at a temperature of 50°C, add 8g of phosphoric acid for neutralization for 20 minute...

Embodiment 2

[0032] (1) Add 15.2g of propylene glycol and 3.65g of cesium hydroxide to the reaction kettle, replace the air in the kettle with nitrogen three times, then raise the temperature to 100-105°C, and keep the temperature for dehydration for 1h under vacuum degree ≥-0.098MPa. Then 1200g of propylene oxide is added dropwise to react, the reaction temperature is controlled to be 110-115° C., and the pressure is less than 0.4 MPa. After the reaction of propylene oxide is finished, slowly add 105g of ethylene oxide dropwise, control the reaction temperature to 110-115°C, and the pressure to be less than 0.4MPa. After the pressure remains constant, the residual monomer is removed in vacuum. Cool down to 50°C and discharge to obtain 1320 g of crude polyether polyol.

[0033] (2) Move the crude polyether polyol obtained above to a 2L four-necked flask, add 66g of deionized water and stir for 10 minutes at a temperature of 50°C, add 8.4g of phosphoric acid for neutralization for 20 minute...

Embodiment 3

[0036](1) Add 18.8g of trimethylolpropane and 3.83g of cesium hydroxide into the reaction kettle, replace the air in the kettle with nitrogen three times, then raise the temperature to 110-115°C, and dehydrate under vacuum ≥-0.098MPa 1h, then dropwise add 1260g propylene oxide to react, control the reaction temperature to be 110-115°C, and the pressure is less than 0.4MPa. 115°C, the pressure is less than 0.4MPa, and the residual monomer is vacuumed out after the pressure remains constant. Cool down to 50°C and discharge to obtain 1363g of crude polyether polyol.

[0037] (2) Move the crude polyether polyol obtained above to a 2L four-neck flask, add 68g of deionized water and stir for 10 minutes at a temperature of 50°C, add 8.8g of phosphoric acid for neutralization for 20 minutes, add 11g of polyether refined adsorbent for adsorption For 10 minutes, the adsorption temperature is 60-70°C, then the temperature is raised to 110-115°C, and at a vacuum degree ≥ -0.098MPa, heat ...

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Abstract

The invention relates to a preparation method of a low-unsaturation degree high-activity high-molecular-weight polyether polyol, and belongs to the technical field of organic high molecular compound preparation or chemical processing. According to the preparation method, CsOH is taken as a catalyst, epoxypropane and an initiator are added for ring-opening reaction, after ring-opening reaction, ethylene oxide is added for end capping, and a low-unsaturation degree high-activity high-molecular-weight polyether polyol finished product is obtained via refining. The obtained low-unsaturation degree high-activity high-molecular-weight polyether polyol is low in unsaturation degree, high in molecular-weight, and high in activity.

Description

technical field [0001] The invention relates to a preparation method of polyether polyol with low unsaturation, high activity and high molecular weight, and belongs to the technical field of preparation or chemical processing of organic macromolecular compounds. Background technique [0002] Polyether polyol is one of the main raw materials for the synthesis of polyurethane materials. With the expansion of polyurethane application fields, highly active (high primary hydroxyl) polyether polyols with low unsaturation and improved polyurethane reaction speed are increasingly gaining market share. wide recognition. [0003] Studies have found that in the production of polyurethane, the reactivity of primary hydroxyl groups with isocyanate groups is three times higher than that of secondary hydroxyl groups, but in the current process, due to the compatibility of fully primary hydroxylated polyether polyols with isocyanate Poor, it is difficult to use in practice, so polyether po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/28C08G65/30
CPCC08G65/2609C08G65/2648C08G65/30
Inventor 胡其标金一丰尹红马定连余江
Owner ZHEJIANG HUANGMA TECH
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