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Method for preparing low molecular weight distribution polyether

A low-molecular-weight polyether and low-molecular-weight technology, which is applied in the field of preparation of low-molecular-weight distribution polyether, can solve problems that have not been solved well, and achieve the effects of reduced dosage, stable polymerization, and high price-performance ratio

Inactive Publication Date: 2016-08-24
JURONG NINGWU NEW MATERIAL CO LTD BY SHARES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Not well resolved yet

Method used

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Embodiment 1

[0014] A preparation method of polyether with low molecular weight distribution is prepared by using low molecular weight polyether as an initiator; DMC catalyst; and propylene oxide ring-opening polymerization reaction. Including the following steps:

[0015] ① Raw material parts by weight: low molecular weight polyether (self-made, molecular weight 800) 8; DMC catalyst 0.05‰ (Huayin Hengrui Company); propylene oxide 90 (Jiangsu Youlide Chemical Co., Ltd.). Lithium carbonate 0.01‰ (Shanghai BYU Company).

[0016] ②Put low-molecular-weight polyether and lithium carbonate into the reactor, and then dehydrate through nitrogen flow at a temperature of 115-120°C. The DMC catalyst is fed with propylene oxide. After the addition of propylene oxide, stir for 1-3 hours to make the system fully react, then vacuumize and cool to prepare polyether with low molecular weight distribution.

Embodiment 2

[0018] A preparation method of polyether with low molecular weight distribution is prepared by using low molecular weight polyether as an initiator; DMC catalyst; and propylene oxide ring-opening polymerization reaction. Including the following steps:

[0019] ① Raw material parts by weight: low molecular weight polyether (self-made, molecular weight 800) 10; DMC catalyst 0.04‰ (Huayin Hengrui Company); propylene oxide 90 (Jiangsu Youlide Chemical Co., Ltd.). Lithium carbonate 0.02‰ (Shanghai BYU Company).

[0020] ②Put low-molecular-weight polyether and lithium carbonate into the reactor, and then dehydrate through nitrogen flow at a temperature of 115-120°C. After the moisture is qualified, add DMC catalyst and feed propylene oxide. After the addition of propylene oxide , Stir for 1-3 hours to make the system fully react, then vacuumize and cool to obtain polyether.

Embodiment 3

[0022] For the application of the low molecular weight distribution polyether prepared by the above preparation method, take 100 parts of polyether polyol for polyurethane foam, 2 parts of silicone oil, 0.2 part of triethylenediamine catalyst, 3 parts of water, and 110 parts of isocyanate. A polyurethane foam product is obtained by foaming.

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PUM

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Abstract

The invention discloses a method for preparing low molecular weight distribution polyether. The low molecular weight distribution polyether is prepared from the following raw materials: 8-10 parts of low molecular weight distribution polyether, Propylene oxide, lithium carbonate and 0.005% of a DMC catalyst. The method comprises the following steps: feeding the low molecular weight distribution polyether and the lithium carbonate into a reactor, dehydrating with nitrogen at 115-120 DEG C, after the moisture is qualified, adding the DMC catalyst, introducing epoxypropane, after epoxypropane is added, stirring for 1-3 hours to enable the system to react sufficiently, vacuuming, and cooling, thereby preparing the low molecular weight distribution polyether. By adopting the method, the use amount of the catalyst is small, the monomer conversion rate is high, and polymerization can be relatively stable.

Description

technical field [0001] The present invention belongs to the preparation method of organic macromolecule compound, specifically the preparation method of low molecular weight distribution polyether with a new type of catalyst (DMC) instead of the original alkali catalyst. Background technique [0002] With the continuous improvement of the polyether polyol production process, the quality of the product is also continuously improved, but the industrial production of traditional polyether has always been based on anion-catalyzed ring-opening polymerization, the product has a high content of monohydroxy polyether and a wide molecular weight distribution , the double bond content is high, which affects the mechanical and physical properties of polyurethane products. Isomerization becomes especially pronounced as the molecular weight of the polyol increases. It has not been well resolved yet. Contents of the invention [0003] The purpose of the present invention is to provide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C08G18/48C08G101/00
CPCC08G65/2606C08G18/48C08G65/2663C08G2101/00
Inventor 应珏翟洪金郑磊于文超许家鹏徐波涛董胜王传超王成建许谦
Owner JURONG NINGWU NEW MATERIAL CO LTD BY SHARES
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