End capping polyether prepared with end hydroxyl radical polyether and preparation thereof

A technology of hydroxyl-terminated polyether and capped polyether, which is applied in the field of capped polyether and its preparation, and can solve problems such as low capping rate and unstable capping rate

Active Publication Date: 2009-01-14
JIANGSU MAYSTA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The capped polyethers prepared by the above method are all alkyl-capped polyethers such as methyl or ethyl, but they have the problems of unstable capping rate and low capping rate

Method used

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  • End capping polyether prepared with end hydroxyl radical polyether and preparation thereof
  • End capping polyether prepared with end hydroxyl radical polyether and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add allyl alcohol polyether (its structure is CH 2 =CH-CH 2 -(OCH 2 CH 2 ) 10 -(OCH 2 CHCH 3 ) 4 OH) 350g, add 45g of sodium hydroxide, and add co-solvent methanol 100ml, react at -0.08~-0.10Mpa, 85°C for 2.5 hours; cool down to 60°C, dropwise add trimethylchlorosilane 83g, about 1 hour After the dropwise addition is completed, the reaction is continued for 1.5 hours; the pH value of the reaction product is adjusted to 5-6 with acid, and diatomaceous earth and polyether refining preparation are added for treatment for 2 hours to obtain a blocked polyether.

[0021] The end-capped polyether prepared in this example, the end-capping rate is shown in Table 1 through infrared test analysis.

Embodiment 2

[0023] Add allyl alcohol polyether (its structure is CH 2 =CH-CH 2 -(OCH 2 CH 2 ) 16 -(OCH 2 CHCH 3 ) 7 OH) 500g, add 25g of sodium hydroxide, and 50ml of co-solvent methanol, react at -0.08~-0.10Mpa, 80°C for 3.0 hours; cool down to 60°C, dropwise add trimethylchlorosilane 60g, about 40 minutes After the dropwise addition is completed, the reaction is continued for 1.0 hour; the pH value of the reaction product is adjusted to 5-6 with acid, and diatomaceous earth and polyether refining preparation are added for treatment for 2 hours to obtain a blocked polyether.

[0024] The end-capped polyether prepared in this example, the end-capping rate is shown in Table 1 through infrared test analysis.

Embodiment 3

[0026] Add allyl alcohol polyether (its structure is CH 2 =CH-CH 2 -(OCH 2 CH 2 ) 10 -(OCH 2 CHCH 3 ) 4 OH) 350g, add 40g sodium methoxide, and add 100ml co-solvent methanol, react at -0.08~-0.10Mpa, 120°C for 2.5 hours; cool down to 60°C, drop trimethylchlorosilane 80g, about 1 hour After the addition is completed, the reaction is continued for 1.5 hours after the dropwise addition; the pH value of the reaction product is adjusted to 5-6 with an acid, and diatomaceous earth and polyether refining preparation are added for treatment for 2 hours to obtain a blocked polyether.

[0027] The end-capped polyether prepared in this example, the end-capping rate is shown in Table 1 through infrared test analysis.

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Abstract

The invention discloses end capping polyether which is prepared by hydroxyl-terminated polyether and the preparation method thereof. The reaction condition is mild, and the end capping rate can achieve higher than 95 percent. The end capping polyether prepared by the hydroxyl-terminated polyether is provided with the structure that R is C1-C20 carbon chain group, R1 is-H, -CH3 or -CH2CH3, R2 is -H, -CH3 or -CH2CH3, m and n are respectively the number of the chain segment of OCH2-CHR1 and OCH2-CHR2 in the chain segment of the polyether, m is 0 to 45, m plus n is 1 to 210, and the chain segments of n and m are respectively homopolymerized, segmented or randomly copolymerized.

Description

technical field [0001] The invention relates to a blocked polyether and a preparation method thereof, more specifically to a blocked polyether prepared from a hydroxyl-terminated polyether and a preparation method thereof. Background technique [0002] End-capped polyether means that its terminal hydroxyl group undergoes etherification, esterification or cross-linking reactions with various organic small molecule compounds, and the active hydrogen on the hydroxyl group is replaced by various short-chain alkyl groups, aralkyl groups, ester groups or Polyether obtained by substitution of other groups. Since the hydroxyl groups at the chain ends are replaced by other groups, the capped polyether has high chemical stability. The special structure of end-capped polyether leads to its special physical and chemical properties, and it has a very wide range of applications in the field of modified polyether such as polyether modified silicone, cleaning, textile printing and dyeing. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/32C08G65/336C08G65/48C07F7/18
Inventor 孙宇李丰富
Owner JIANGSU MAYSTA CHEM
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