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Preparation method of narrow-distribution polyether

A narrow distribution, polyether technology, applied in the chemical field, can solve the problems of high cost and large amount of phosphazene, and achieve the effects of reducing the amount of use, improving the catalytic efficiency, and solving the complex process

Inactive Publication Date: 2016-11-09
QINGSHEN XINTONGLING BUILDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the above technical problems, provide a preparation method of narrow distribution polyether, by adopting phosphazene and double metal cyanide composite catalyst to prepare narrow distribution polyether, solve the problem of using phosphazene alone with large consumption and high cost , the problem that double metal cyanide alone cannot directly catalyze small molecule alcohols to prepare polyethers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of preparation method of narrow distribution polyether:

[0037] Mix phosphazene and double metal cyanide evenly at a mass ratio of 5:1 to obtain a composite catalyst; add 60 g of small molecule alcohol and 2.0 g of composite catalyst to the reaction vessel, heat up to 80-130° C., and vacuum dehydrate; control the reaction temperature to 100-180°C, pressure 0.1-0.6MPa, continuously add 2700g of propylene oxide into the reaction vessel, until the reaction pressure no longer drops after the propylene oxide is added, a polyether with a molecular weight distribution of 1.06 is obtained. The double metal cyanide is Zn 3 [Co(CN) 6 ] 2 ·(ZnCl 2 ) · 3 tert-butanol · 2 glycerol, the small molecule alcohol is glycerol.

Embodiment 2

[0039] A kind of preparation method of narrow distribution polyether:

[0040] Mix phosphazene and double metal cyanide evenly at a mass ratio of 0.2:1 to obtain a composite catalyst; add 30 g of small molecule alcohol and 0.5 g of composite catalyst to the reaction vessel, heat up to 80-130 ° C, and vacuum dehydrate; control the reaction temperature to 100-180°C, pressure 0.1-0.6MPa, continuously add 2300g of propylene oxide into the reaction vessel, after the propylene oxide is added until the reaction pressure no longer drops, a polyether with a molecular weight distribution of 1.10 is obtained. The double metal cyanide is Zn 3 [Co(CN) 6 ] 2 ·(ZnCl 2 ) · 3 tert-butanol · 2 glycerol, the small molecule alcohol is pentylene glycol.

Embodiment 3

[0042] A kind of preparation method of narrow distribution polyether:

[0043]Mix phosphazene and double metal cyanide evenly at a mass ratio of 0.8:1 to obtain a composite catalyst; add 45g of small molecule alcohol and 1.2g of composite catalyst to the reaction vessel, heat up to 80-130°C, and vacuum dehydrate; control the reaction temperature to 100-180°C, pressure 0.1-0.6MPa, continuously add 3000g propylene oxide into the reaction vessel, after the propylene oxide is added until the reaction pressure no longer drops, a polyether with a molecular weight distribution of 1.12 is obtained. The double metal cyanide is Zn 3 [Co(CN) 6 ] 2 ·(ZnCl 2 ) · 3 tert-butanol · 2 glycerol, the small molecule alcohol is pentaerythritol.

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PUM

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Abstract

The invention relates to the field of chemistry, in particular to a preparation method of a narrow-distribution polyether. The preparation method comprises the following steps: A, adding small-molecule alcohol and a composite catalyst to a reaction vessel, raising the temperature to 80 to 130 DEG C, and vacuumizing and carrying out dehydration, wherein the composite catalyst is formed by compounding phosphazene and double-metal cyanides; B, controlling the reaction temperature and pressure, adding epoxide into the reaction vessel, and enabling reaction till the pressure is no longer lowered to obtain the narrow-distribution polyether. According to the invention, the composite catalyst of the phosphazene and the double-metal cyanides is used for preparing the narrow-distribution polyether, so that the problems of large use amount and high cost for the single use of the phosphazene and incapability of directly catalyzing the small-molecule alcohol to prepare the polyether by the single use of the double-metal cyanides are solved. The preparation method disclosed by the invention is simple, the cost is low and the preparation method of the narrow-distribution polyether is of great significance on promoting the application and development of the polyether.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a preparation method of narrow-distribution polyether. Background technique [0002] Polyether is prepared by polyaddition reaction between an initiator containing active hydrogen and ethylene oxide, propylene oxide, butylene oxide, etc. in the presence of a catalyst. The polyether with the largest yield is the reaction of glycerin (glycerol) as the initiator, alkali as the catalyst and epoxide (generally propylene oxide and ethylene oxide together), by changing the propylene oxide and ethylene oxide Various general-purpose polyether polyols can be produced according to the specific feeding method (mixing or separate feeding), dosage ratio, feeding sequence and other conditions. Polyether polyol is an important derivative of propylene oxide and one of the main raw materials for the synthesis of polyurethane. It can be used as functional additives such as emulsifiers, wetting agents, def...

Claims

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Application Information

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IPC IPC(8): C08G65/10
CPCC08G65/10
Inventor 曾君张大康李健吴小波谢守龙彭亮
Owner QINGSHEN XINTONGLING BUILDING MATERIALS CO LTD