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Method for preparing low-unsaturation-degree polyether polylol

A polyether polyol and saturation technology, which is applied in the field of preparation of low-unsaturation polyether polyol, can solve the problems of high catalyst concentration, long catalyst induction period and high production cost

Active Publication Date: 2005-12-21
SINOPEC SHANGHAI GAOQIAO PETROCHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the catalyst induction period is longer when the low unsaturation polyether polyol is prepared in the prior art, the concentration of the catalyst in the initiator is higher, and the production cost is high. A new Process for preparing low unsaturation polyether polyols

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of double metal cyanide complex catalyst

[0026] Add 8 grams of potassium hexacyanocobaltate to 140 milliliters of distilled water to dissolve it. Slowly add 38.5% (weight) ZnCl at a speed of 8000 rpm 2 65 g of the aqueous solution, and then add a mixture of 100 ml of tert-butanol and 100 ml of distilled water, and after stirring for 20 minutes, vacuum filter with a sand core funnel. The solid was vacuum dried at 60° C. to a constant weight to obtain 12.6 g of solid powder catalyst I.

[0027] After analysis: Co 8.6% (weight)

[0028] Zn 22.4% (weight)

[0029]Tert-Butanol 15.7% (weight)

Embodiment 2

[0031] Propylene oxide polymerization

[0032] Add 80 grams of initiator (400Mn, polyoxypropylene propylene glycol) and 0.020 grams of catalyst I prepared in Example 1 into a 2-liter pressure-resistant reactor. After vacuuming and heating to 105°C, 30 grams of propylene oxide are added , The pressure of the reactor rose rapidly to 0.20MPa, and the temperature of the reactor was maintained at 105~110℃. After 15 minutes (considered as the induction period of the catalyst), the pressure of the reactor was significantly reduced, and the temperature of the reactor was maintained at 105~110℃. Under the circumstances, continuously add 690 grams of propylene oxide so that the reactor pressure does not exceed 0.20 MPa. After the propylene oxide is added, when the pressure of the reactor no longer changes, the reaction has ended. The total reaction time is 22 minutes. Vacuum The unreacted residual monomer was removed, and 796 grams of polyether glycol was obtained by cooling.

[0033] After...

Embodiment 3

[0035] Propylene oxide polymerization

[0036] Add 80 grams of initiator (400Mn, polyoxypropylene propylene glycol) and 0.020 grams of catalyst I prepared in Example 1 into a 2-liter pressure-resistant reactor. After vacuuming and heating to 105°C, 30 grams of propylene oxide are added , The pressure of the reactor rose rapidly to 0.19MPa, and the temperature of the reactor was maintained at 105~110℃. After 10 minutes (considered as the induction period of the catalyst), the pressure of the reactor was significantly reduced, and the temperature of the reactor was maintained at 105~110℃. Under the circumstances, continuously add 690 grams of propylene oxide so that the reactor pressure does not exceed 0.20 MPa. After the propylene oxide is added, when the pressure of the reactor no longer changes, the reaction has ended. The total reaction time is 18 minutes. Vacuum The unreacted residual monomers were removed, and 795 grams of polyether glycol was obtained by cooling.

[0037] Aft...

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Abstract

The invention relates to the preparation of a kind of low unsaturation polyether polyols. It's mainly used to solve the problem in previous technology that it has long catalyst inductive period and the concentration of catalyst in initiator is high, which is that it has a high catalyst cost in the preparation of unsaturation polyether polyols. The invention excellently solves the said problem through adopting catalyst components containing double metal cyanide (DMC) mixture, C4 - C10 organic mellow with tertiary alcohol structure, adding bronsted acid, and adopting the technology project of inert gas frothing to degasificate. So it can be used in the industrial production of low unsaturation polyether polyols.

Description

Technical field [0001] The invention relates to a preparation method of a low-unsaturation polyether polyol. Background technique [0002] As we all know, when alkali is used as a catalyst (mainly KOH) for epoxide polymerization to prepare polyether polyols, due to low catalytic activity, the crude product needs to undergo post-treatment processes such as acid neutralization, dehydration, and decolorization. The obtained polyether polyol has a high degree of unsaturation, which will have an adverse effect on polyurethane products. At the same time, it is also difficult to prepare high molecular weight polyether polyols with alkaline (KOH) catalysts. [0003] Double metal cyanide catalysts can be used for epoxide polymerization to prepare low-unsaturation polyether polyols, which can be used to prepare polyurethane coatings, elastomers, foams, sealants, adhesives and other products. [0004] The double metal cyanide catalyst is a kind of precipitate obta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/34
Inventor 宋虹霞陈凤秋顾良民顾卫东郑银才邓爱华周新华徐文跃蒋晓群
Owner SINOPEC SHANGHAI GAOQIAO PETROCHEM CORP
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