Method for preparing polyether polyol

A technology of polyether polyol and polymerization reaction, which is applied in the field of polyol preparation, can solve the problems of difficult reaction unit and curing unit, and achieve the effects of beneficial polymerization reaction, elimination of gas phase dead zone, and narrow molecular weight distribution

Active Publication Date: 2014-05-07
佳化化学(抚顺)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To achieve this control index stably, it will be difficult to rely only on the reaction unit and the curing unit of the ordinary tank reactor.

Method used

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  • Method for preparing polyether polyol

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Experimental program
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Effect test

Embodiment 1

[0023] A kind of method for preparing polyether polyol, its process flow diagram is as figure 1As shown, the method comprises the following steps: After mixing double metal cyanide complex catalyst, oxyalkylene and polyether polyol with molecular weight of 200 as starter in static mixing reactor 7, from the bottom of main reactor 1 Imported into the main reactor 1, the reaction temperature is controlled at 140-150°C, and the reaction time is 0.5h. Polymerization occurs through mass transfer and heat transfer. In the main reactor, through mass transfer and heat transfer, although most of the reactants are in the liquid The polymerization reaction has been carried out in the phase, but there is still unavoidably a small part of unreacted oxyalkylene monomers gathered at the top of the main reactor 1, and this part of unreacted oxyalkylene monomers enters the secondary reactor 2 of the circulating reaction system, The reaction temperature is controlled at 140-150°C, and the react...

Embodiment 2

[0028] A kind of method for preparing polyether polyol, its technological process is identical with embodiment 1, and the raw material that adopts is that double metal cyanide complex catalyst, oxyalkylene and molecular weight are 600 polyether polyols as initiator, main reactor The reaction temperature is , the reaction pressure is , the reaction temperature of the secondary reactor is , the reaction pressure is , the reaction temperature of the aging tank is , and the reaction pressure is . The obtained polyether polyol has an average functionality of 2; the molecular weight of the polyether polyol is 50000; and the degree of unsaturation is 0.002.

Embodiment 3

[0030] A kind of method for preparing polyether polyol, its technological process is identical with embodiment 1, the raw material that adopts is that double metal cyanide complex catalyst, oxyalkylene and molecular weight are the polyether polyol of 1000 as initiator, main reactor The reaction temperature is , the reaction pressure is , the reaction temperature of the secondary reactor is , the reaction pressure is , the reaction temperature of the aging tank is , and the reaction pressure is . The obtained polyether polyol has an average functionality of 8, the molecular weight of the polyether polyol is 10000, and the degree of unsaturation is 0.010.

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Abstract

The invention relates to a method for preparing polyether polyol. The method comprises the following steps of: mixing a catalyst, oxyalkylene and an initiator in a static mixing reactor, introducing the mixture into a main reactor from the bottom of the main reactor, performing reaction at the reaction temperature of 140 to 150 DEG C for the reaction time of 0.5 hour, performing polymerization reaction by using mass transfer and heat transfer, introducing an obtained material into a curing kettle from an outlet in the top of the main reactor, and performing reaction at the reaction temperature of 150 DEG C and the reaction time of 0.5 hour to obtain the polyether polyol. Compared with the prior art, the method has the advantages that the conversion rate of the oxyalkylene can be stably increased to be over 99.998 percent, the obtained polyether polyol is narrow in molecular weight distribution and low in degree of unsaturation, the production efficiency is improved, and the production cost is decreased.

Description

technical field [0001] The invention relates to a method for preparing polyols, in particular to a method for preparing polyether polyols. Background technique [0002] Polyether polyol is an important intermediate for the preparation of polyurethane, widely used in the preparation of polyurethane foam, elastomers, coatings, fibers, synthetic leather and pavement materials, usually using alkali (KOH) as a catalyst, and has appeared in recent years A high-efficiency catalyst for bimetallic (or multimetallic) cyanide complexes has been discovered, and its performance is superior to the preparation method using alkali (KOH) as a catalyst in many aspects, and is widely used in the preparation of polyether polyols. No matter which kind of catalyst is used, most of them are produced by batch method, which is not conducive to operation control, the quality of each batch of products is also unstable, and the production efficiency is low. When batch production of polyether polyols u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/28C08G18/48
Inventor 李金彪赵振华陈钊于江燕仲飞
Owner 佳化化学(抚顺)新材料有限公司
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