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Novel polyether ester defoamer and preparation method thereof

A technology of polyetherester and defoamer, which is applied in the field of new polyetherester defoamer to achieve the effects of good degassing and foam suppression, low surface tension and good defoaming ability

Inactive Publication Date: 2017-07-25
济宁南天农科化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no report on the polyether ester defoamer with a higher aliphatic alcohol with a carbon chain length greater than 18 as a starter

Method used

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  • Novel polyether ester defoamer and preparation method thereof
  • Novel polyether ester defoamer and preparation method thereof
  • Novel polyether ester defoamer and preparation method thereof

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preparation example Construction

[0027] The invention discloses a preparation method of a novel polyether ester defoamer. The novel polyether ester defoamer is prepared by using higher aliphatic alcohol with a carbon chain length greater than 18 as an initiator.

[0028] The preparation method of described novel polyether ester defoamer, comprises the steps:

[0029] (1) take higher fatty alcohol as initiator, carry out polyether reaction with ethylene oxide, propylene oxide under the effect of the first catalyst, prepare fatty alcohol polyoxyethylene polyoxypropylene ether;

[0030] (2) The fatty alcohol polyoxyethylene polyoxypropylene ether prepared in step (1) is subjected to esterification reaction with fatty acid under the action of the second catalyst to prepare polyether ester.

[0031] Preferably, the synthetic fatty alcohols include but are not limited to Nafol 20+, Nafol1822, Nafol 2022 or Nafol 22+ synthesized by the Ziegler method; the natural fatty alcohols include but not limited to eicosanol, ...

Embodiment 1

[0050] Using Nafol 20+ as the initiator, polyether reaction with ethylene oxide and propylene oxide under the action of DMC double metal cyanide catalyst, the molar ratio of ethylene oxide and propylene oxide is 1:2.7, the reaction The temperature is 110°C, the reaction time is 6-8 hours, and the hydroxyl value of the prepared fatty alcohol polyoxyethylene polyoxypropylene ether is 24.8mg KOH / g;

[0051] Under the action of p-toluenesulfonic acid, the above prepared fatty alcohol polyoxyethylene polyoxypropylene ether and lauric acid undergo esterification reaction at a molar ratio of 1.1:1, the reaction temperature is 150°C, and the reaction time is 2 to 4 hours. Polyether ester, the esterification rate is 72.4%.

Embodiment 2

[0053] Using Nafol 20+ as the initiator, polyether reaction with ethylene oxide and propylene oxide under the action of DMC double metal cyanide catalyst, the molar ratio of ethylene oxide and propylene oxide is 1:3.5, the reaction The temperature is 110°C, the reaction time is 6-8 hours, and the hydroxyl value of the prepared fatty alcohol polyoxyethylene polyoxypropylene ether is 26.4mg KOH / g;

[0054] In solid superacid (SO 4 2- / SnO 2 -TiO 2 -Al 2 o 3 ) under the action of the fatty alcohol polyoxyethylene polyoxypropylene ether prepared above and oleic acid in a molar ratio of 1:1 for esterification, the reaction temperature is 150 ° C, and the reaction time is 2 to 4 hours to obtain polyether ester. The esterification rate is 78.6%.

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Abstract

The invention provides a novel polyether ester defoamer prepared by using a higher aliphatic alcohol having carbon chain length of 18 as an initiator. A preparation method of the novel polyether ester defoamer comprises the steps of (1) subjecting a higher aliphatic alcohol as an initiator to polyether reaction with ethylene oxide and propylene oxide under the action of a first catalyst so as to prepare fatty alcohol polyoxyethylene polyoxypropylene ether; (2) subjecting the fatty alcohol polyoxyethylene polyoxypropylene ether to esterification reaction with fatty acid under the action of a second catalyst so as to prepare polyether ester. The novel polyether ester defoamer prepared herein is lower in surface tension and higher in defoaming capacity than traditional polyether ester defoamers; as the higher aliphatic alcohol is used as the initiator, the novel polyether ester defoamer is also better in degassing and foam-inhibiting effect than higher aliphatic alcohol defoamers.

Description

technical field [0001] The invention relates to the technical field of defoamers, in particular to a novel polyether ester defoamer. Background technique [0002] In the production process of papermaking, chemical industry, paint, building materials and food processing, there are two phases of gas and liquid in the system. Under the mechanical action of stirring and transmission, it is very easy to bring air bubbles into the liquid system. At the same time, under the action of the system's own or additional surfactants, foams will also be generated, which will cause various foam problems in the production process and affect normal production. Conventional defoaming methods include physical methods, chemical methods and steam methods, among which the chemical method of defoaming with defoamers is currently the most important defoaming method. [0003] The defoamer has an efficient defoaming effect on the foaming system. There are many kinds of defoamers. After years of deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04C08G65/332C08G65/28
CPCB01D19/0404C08G65/2609C08G65/3322C08G2650/04
Inventor 马朴黄军张宗举李陶伟
Owner 济宁南天农科化工有限公司
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