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Prepn process of active defoaming agent composition

A composition and active technology, applied in the direction of foam dispersion/prevention, etc., can solve the problems of unsatisfactory foam suppressing performance and unsatisfactory foam suppressing activity.

Active Publication Date: 2007-03-21
JIANGSU SIXIN SCI-TECH APPL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But all the organosilicon active substances mentioned in these patents have unsatisfactory antifoaming performance in strong alkali environment, especially in high temperature and strong alkali environment, their antifoaming activity is not ideal

Method used

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  • Prepn process of active defoaming agent composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of antifoaming active composition:

[0027] Add 2000g of silicone oil with a viscosity of 100,000MPa·s, 200g of MQ resin (M / Q ratio of 0.40:1.00), 20g of catalyst A (note: prepared by the reaction of KOH and methyl silicone oil) into a 5L vacuum mixer, and heat up to 100 Add 100g of hydrophobic white carbon black and 30g of methyltriethoxysilane after polymerization of the reactants at -150°C, stir well, and control the temperature of the reaction system at 100-120°C for 4 hours, and finally at 160°C with a vacuum of 0.03 When -0.05MPa, react for another 2 hours to make the reaction complete. Then it was cooled to room temperature to obtain a white cross-linked antifoaming active composition.

[0028] (2) Preparation of emulsion type defoamer:

[0029] Add 250g Span, 100g Tween, 800g223 polyether, 700g400 polyether to the antifoaming active composition prepared above, heat to 70°C under continuous vigorous stirring, slowly add 1200g water, and then add...

Embodiment 2

[0032] (1) Preparation of antifoaming active composition:

[0033] Add 2000g of silicone oil with a viscosity of 200,000MPa·s, 100g of MQ resin (M / Q ratio of 1.0:1.0), 20g of catalyst B (note: prepared by the reaction of NaOH and methyl silicone oil) into a 5L vacuum mixer, and heat up to 80- Add 100g of hydrophobic white carbon black and 30g of hexamethyldisilazane after the reaction material is cross-linked at 140°C, stir well, and control the temperature of the reaction system at 90-110°C for 4 hours. At 0.05MPa, react for another 2h to make the reaction complete. Then it was cooled to room temperature to obtain a white polymeric defoaming active composition.

[0034] (2) Preparation of solvent-based defoamer:

[0035] Add 100 g of the above-prepared silicone active composition into 200 g of diethylene glycol and raise the temperature to 100-105° C. for 1 hour to fully dissolve it, and then the defoamer B with excellent defoaming and antifoaming properties can be prepared...

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Abstract

The present invention is one kind of active defoaming composition suitable for eliminating harmful foams under high temperature and strong alkaline condition in high efficiency, and may be used in washing paper pulp, treating metal surface and other fields. The active defoaming composition is prepared with organic siloxane, silicone resin, inorganic oxide particle, hydrophobic treating agent, catalyst and other material. The preparation process includes the following steps: 1. mixing organic siloxane, silicone resin and catalyst, and heating the mixture to 80-200 deg.c for controllable polymerization; 2. adding inorganic oxide particle and hydrophobic treating agent; and 3. further heating to reaction at 80-200 deg.c temperature and 0.01-0.08 MPa vacuum for 2-10 hr, and cooling to room temperature to obtain white polymer as the active defoaming composition.

Description

Technical field: [0001] The present invention relates to a kind of preparation method of defoamer active composition, more precisely the present invention relates to a kind of preparation method of the defoamer active composition suitable for eliminating harmful foam under the condition of high temperature and strong alkali, such as being used in pulping and papermaking , metal surface cleaning and other fields, defoamer is a kind of fine chemical additive, therefore, the present invention belongs to fine chemical additives [0002] technology field. Background technique: [0003] Foam is a common phenomenon in people's life and work, and it brings great harm to industrial production, such as reducing the working efficiency of machines, delaying working hours, and affecting product quality. The methods of eliminating harmful foam mainly include physical methods and chemical methods for defoaming. In comparison, chemical methods, that is, using defoamers for defoaming, have ...

Claims

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Application Information

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IPC IPC(8): B01D19/04
Inventor 陈晓军曹治平
Owner JIANGSU SIXIN SCI-TECH APPL RES INST CO LTD
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