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Environment-friendly highly efficient mighty defoamer prescription and production process

An emulsion-type defoamer and defoamer technology, applied in the direction of foam dispersion/prevention, can solve problems such as easy explosion, poor emulsion stability, and poor initial defoaming speed

Inactive Publication Date: 2006-05-03
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, there are many kinds of defoamers used in industrial production, but their performance is not perfect
[0003] Chinese patent CN 1161877A is characterized by the use of hydrophobic silicon dioxide particles as a foam breaker, silicone oil containing dimethyl and trimethyl as a general temperature defoamer, and ethylene oxide and propylene oxide The ring-opened copolymer is used as a dispersant, and its disadvantages are poor chemical stability and explosive
The initial defoaming speed of this kind of defoamer is not good, so the dosage is too much, and the defoaming time is long. At the same time, it has the disadvantages of complicated production process, high cost, and poor emulsion stability.

Method used

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  • Environment-friendly highly efficient mighty defoamer prescription and production process

Examples

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preparation example Construction

[0058]The invention also relates to a method for preparing the defoamer. Usually, the preparation process of the defoamer of the present invention is as follows: a certain amount of silicone oil, paraffin and auxiliary defoaming components are added to the reaction vessel in sequence, and after stirring and mixing (preferably stirring at a constant temperature of 80-100°C) 10-60 minutes), add a dispersant to disperse, and then add an emulsifier to emulsify (preferably add in several times, such as adding in 2-10 times). Then add deionized water at 70-95°C (preferably 80-90°C) to dilute, continue to stir evenly, and discharge after cooling to room temperature to obtain the defoamer of the present invention, which is usually milky white or slightly off yellow liquid.

[0059] Compared with the prior art, the defoamer of the present invention has the following main advantages:

[0060] 1. High surface activity, low surface tension, good defoaming effect, good initial defoaming ...

preparation Embodiment 1

[0067] Preparation of defoamer No.1

[0068] Take 8 parts of simethicone, 15 parts of liquid paraffin, and 8 parts of glycerin, and add them into the reaction kettle in the order of simethicone, liquid paraffin, and glycerin, and stir at a constant temperature of 80-100°C After 30 minutes, add 6 parts of polyisobutylene (weight-average molecular weight 3000) and continue constant temperature stirring for 20 minutes, add 10 parts of Tween-80 (Tween-80, produced by Shanghai Sanpu Chemical Co., Ltd.) in 5 times within one hour, and then Add deionized water at 80°C, stir at constant temperature for one hour, and then cool to room temperature to obtain 100 parts of milky white to yellowish defoamer.

[0069] Test the defoaming efficiency of the defoamer with the following method: take 100 milliliters of 5% sodium dodecylbenzenesulfonate as a solution of the foaming agent, add the defoamer prepared above dropwise within 3 minutes (finally add 10 milliliters Defoamer), measure its v...

preparation Embodiment 2

[0072] Preparation of defoamer No.2

[0073] Take 19 parts of simethicone, 3 parts of liquid paraffin, and 10 parts of ethanol, and add them to the reaction kettle in sequence, and stir at a constant temperature of 80-100°C for 30 minutes, then add 3 parts of polyisobutylene (weight average molecular weight 2000 ) continue to stir at constant temperature for 20 minutes, and add 5 parts of emulsifier OP-10 (C 34 h 62 o 11 , produced by Shanghai Jingyan Chemical Technology Co., Ltd.), then add deionized water at 93°C, stir at constant temperature for one hour, and then cool to room temperature. That is to obtain 100 parts of antifoaming agent whose appearance is milky white and yellowish.

[0074] Measured by the same method as in Example 1, the results show that the defoaming efficiency of the defoamer No. 2 at 50° C. for 300 seconds is 97.93%.

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Abstract

The invention relates to an emulsion defoaming agent and ití»s preparing method. The invention comprises (a) silicon oil; (b) olefin hydrocarbon; (c) auxiliary defoaming component; (d) emulsifier; (e) dispersant which is polyisobutene or polybutene or the assembly of them; (f) solvent. The inventive defoamting agent has high defoaming ability, long foam-restrain time, stable property, environment-friendly ability, innocuity, lower dosage and lower cost.'

Description

technical field [0001] The invention relates to the field of defoamers, in particular to an emulsion type defoamer and a preparation method thereof. Background technique [0002] At present, there are many types of defoamers used in industrial production, but their performance is not perfect. [0003] Chinese patent CN 1161877A is characterized by the use of hydrophobic silicon dioxide particles as a foam breaker, silicone oil containing dimethyl and trimethyl as a general temperature defoamer, and ethylene oxide and propylene oxide The ring-opened copolymer is used as a dispersant, and its disadvantages are poor chemical stability and easy explosion. [0004] European patent EP 0802229A3 is characterized in that it is made of polyisobutylene dispersed polysiloxane, and its disadvantages are high cost of other raw materials and unsatisfactory defoaming effect. [0005] Japanese patent JP 08199020A is characterized in that it is made by mixing polydimethylsiloxane and oligo...

Claims

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Application Information

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IPC IPC(8): B01D19/04
Inventor 彭子飞沈越
Owner SHANGHAI NORMAL UNIVERSITY
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