Preparation method of low-molecular-weight acetyl-terminated allyl alcohol polyether

A technology of terminal allyl alcohol polyether and allyl alcohol polyether, which is applied in the field of preparation of low molecular weight acetyl-terminated allyl alcohol polyether

Active Publication Date: 2013-02-06
ZHEJIANG HUANGMA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of preparation method of low molecular weight acetyl-terminated allyl alcohol polyether, the prepared acetyl-terminated allyl alcohol polyether Ether has the characteristics of low moisture, low peroxide value, long shelf life, good performance, etc., especially solves the problem that allyl alcohol polyether with low molecular weight M≤1000 is prone to hydrolysis and air oxidation during storage after capping

Method used

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  • Preparation method of low-molecular-weight acetyl-terminated allyl alcohol polyether

Examples

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Effect test

Embodiment 1

[0019] The end-capping rate of the acetyl-terminated allyl alcohol random polyether finally prepared in this example was 96%, and the product indicators remained basically unchanged within one year.

[0020] The preparation method of a low-molecular-weight acetyl-terminated allyl alcohol polyether obtained by using this example has the following advantages: After dehydration to a certain content by high vacuum in a circulating spray dehydration reactor, the relative content of acetyl groups is greatly reduced. The degree of hydrolysis and deterioration of the low molecular weight acetyl-terminated allyl alcohol polyether during storage, at the same time, the oxygen in the barrel is reduced to a certain level by passing the inert gas when the finished polyether is packaged in the barrel, thereby reducing The degree of α-H of unsaturated double bonds and ether bonds in low molecular weight acetyl-terminated allyl alcohol polyethers with relatively high unsaturated double bond con...

Embodiment 2

[0023] The end-capping rate of the acetyl-terminated allyl alcohol random polyether finally prepared in this example was 97%, and the product indicators remained basically unchanged within one year.

[0024] The preparation method of a low-molecular-weight acetyl-terminated allyl alcohol polyether obtained by using this example has the following advantages: After dehydration to a certain content by high vacuum in a circulating spray dehydration reactor, the relative content of acetyl groups is greatly reduced. The degree of hydrolysis and deterioration of the low molecular weight acetyl-terminated allyl alcohol polyether during storage, at the same time, the oxygen in the barrel is reduced to a certain level by passing the inert gas when the finished polyether is packaged in the barrel, thereby reducing The degree of α-H of unsaturated double bonds and ether bonds in low molecular weight acetyl-terminated allyl alcohol polyethers with relatively high unsaturated double bond con...

Embodiment 3

[0027] The end-capping rate of the acetyl-terminated allyl alcohol random polyether finally prepared in this example was 98%, and the product indicators remained basically unchanged within one year.

[0028] The preparation method of a low-molecular-weight acetyl-terminated allyl alcohol polyether obtained by using this example has the following advantages: After dehydration to a certain content by high vacuum in a circulating spray dehydration reactor, the relative content of acetyl groups is greatly reduced. The degree of hydrolysis and deterioration of the low molecular weight acetyl-terminated allyl alcohol polyether during storage, at the same time, the oxygen in the barrel is reduced to a certain level by passing the inert gas when the finished polyether is packaged in the barrel, thereby reducing The degree of α-H of unsaturated double bonds and ether bonds in low molecular weight acetyl-terminated allyl alcohol polyethers with relatively high unsaturated double bond con...

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Abstract

The invention discloses a preparation method of low-molecular-weight acetyl-terminated allyl alcohol polyether. The method comprises the steps of using low molecular weight allyl alcohol polyether and acetic anhydride as the raw materials, carrying out esterification, bubbling deacidification, hydrolysis and deacidification, refining and absorbing, dehydrating to obtain the low-molecular-weight acetyl-terminated allyl alcohol polyether, and then packaging to obtain the final product. The acetyl-terminated allyl alcohol polyether prepared by the invention has the advantages of low water content, low peroxide number, long shelf life, good service performance and the like. According to the method provided by the invention, the problem that the acetyl-terminated allyl alcohol polyether with low molecular weight (M<=1000) can be hydrolyzed and oxidized easily in the air when stored can be solved.

Description

technical field [0001] The invention relates to a preparation method of a low-molecular-weight acetyl-terminated allyl alcohol polyether, and belongs to the technical field of synthesis of alkyl-terminated polyethers. Background technique [0002] The low-molecular-weight acetyl-terminated allyl alcohol polyether refers to a polyether in which the hydrogen on the terminal hydroxyl group of the allyl alcohol polyether with a molecular weight of M≤1000 is replaced by an acetyl group. In addition to the properties of allyl alcohol polyether, acetyl-terminated allyl alcohol polyether has many special properties, such as low foam, strong lipophilicity, low pouring point, and low viscosity after the end-capped polyether. , suitable for the synthesis of polyether modified silicone and other fields. [0003] Due to the low molecular weight acetyl-terminated allyl alcohol polyether, on the one hand, the acetyl group content is relatively high, and the acetyl group is easily hydrolyz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/00C07C69/16C07C67/48C07C67/32C07C67/08
Inventor 王胜利金一丰万庆梅董楠谢专
Owner ZHEJIANG HUANGMA TECH
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