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Polyether modified organic silicon defoamer safe to strains and preparation method thereof

A technology of organosilicon defoamer and polyether modified silicone oil, applied in separation methods, chemical instruments and methods, foam dispersion/prevention, etc., can solve the problems of ineffective extinguishing of foam, difficulty in removing silicon spots, and influence on bacterial growth To achieve the effect of improving dispersibility and anti-foaming ability, fast defoaming speed and low surface tension

Pending Publication Date: 2020-12-11
JIANGSU SAIOUXINYUE DEFOAMER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyether defoamers are non-toxic, odorless, good in water dispersion, and have strong foam suppression ability, but the foam breaking rate is low and cannot effectively extinguish a large amount of foam
Silicone defoaming agent has high defoaming ability and good chemical stability, and is widely used, but its antifoaming ability is poor, the dispersion effect in the aqueous phase system is poor, it is difficult to emulsify, and it will affect the growth of bacteria. Spots are not easy to remove, and are subject to certain restrictions in the fermentation, textile printing and dyeing industries

Method used

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  • Polyether modified organic silicon defoamer safe to strains and preparation method thereof

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preparation example Construction

[0021] The invention provides a polyether modified silicone antifoaming agent safe to strains, comprising the following components in parts by weight: 30-60 parts of modified silicon dioxide nano-microspheres, 30-50 parts of polyether modified silicone oil part, 1-10 parts of thickener, 2-10 parts of emulsifier and 10-50 parts of water, and its preparation method comprises the steps:

[0022] (1) Add ammonia water to absolute ethanol, add tetraethyl orthosilicate (TEOS) drop by drop under vigorous stirring, then stir at 20-30°C for 20-24 hours, centrifuge after the reaction, and use free Washing with water and ethanol, centrifuging again, repeated several times, and finally vacuum freezing to obtain silicon dioxide nanometer microspheres.

[0023] (2) The silicon dioxide nano-microspheres obtained in step (1), dimethyl silicone oil, N, N-methylformamide (DMF) and deionized water are added to the reaction flask successively, and ammonia water is added under stirring, and heated...

Embodiment 1

[0034] In this example, the preparation method of the polyether modified silicone defoamer that is safe to strains is as follows:

[0035] (1) Add 3mL of ammonia water to 100mL of absolute ethanol, add 5mL of tetraethyl orthosilicate (TEOS) dropwise under vigorous stirring, then stir at 20°C for 24 hours, centrifuge after the reaction, and remove the precipitate with anhydrous Washing with ethanol, centrifuging again, repeated several times, and finally vacuum freezing to obtain silicon dioxide nanometer microspheres.

[0036] (2) Get 1g of silica nanospheres obtained in step (1), 0.5mL of dimethyl silicone oil, 20mL of N, N-methylformamide (DMF) and 10mL of deionized water into the reaction flask successively, and stir Add 1mL of ammonia water under low temperature, heat to 70°C and react for 2 hours, then naturally cool to room temperature, centrifuge, take the precipitate, wash it with ethanol, and dry it in an oven at 60°C to obtain simethicone grafted modified silica nano...

Embodiment 2

[0040] In this example, the preparation method of the polyether modified silicone defoamer that is safe to strains is as follows:

[0041] (1) Add 4mL of ammonia water to 100mL of absolute ethanol, add 6mL of tetraethyl orthosilicate (TEOS) dropwise under vigorous stirring, then stir at 30°C for 20 hours, centrifuge after the reaction, and remove the precipitate with anhydrous Washing with ethanol, centrifuging again, repeated several times, and finally vacuum freezing to obtain silicon dioxide nanometer microspheres.

[0042] (2) Get 2g of silica nanospheres obtained in step (1), 1.0mL of dimethyl silicone oil, 30mL of N, N-methylformamide (DMF) and 10mL of deionized water into the reaction flask in turn, and stir Add 2mL of ammonia water under low temperature, heat to 60°C and react for 1.5 hours, then naturally cool to room temperature, centrifuge, take the precipitate, wash it with ethanol and dry it in an oven at 50°C to obtain simethicone grafted modified silica nanopart...

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Abstract

The invention belongs to the technical field of defoamers and discloses a polyether modified organic silicon defoamer safe to strains and a preparation method thereof. The preparation method includesthe following steps that: silicon dioxide nanometer microspheres, dimethyl silicone oil, DMF and deionized water are sequentially added into a reaction flask, ammonia water is added while stirring isconducted, heating is conducted to 50-70 DEG C, a reaction is conducted for 1-2 hours, cooling is conducted to the room temperature, and centrifugation is conducted, a precipitate is washed with ethanol, and drying is performed to obtain dimethicone grafted and modified silicon dioxide nano microspheres; 30-60 parts of the dimethicone grafted and modified silicon dioxide nano microspheres, 30-50 parts of polyether modified silicon oil, 1-10 parts of a thickener, 2-10 parts of an emulsifier and 10-50 parts of water are added into a dispersion tank, heating is conducted to 180-200 DEG C, stirring is performed for 2-3 hours, gradient cooling is carried out to 50-60 DEG C in a stirring state, and finally natural cooling is performed to obtain the polyether modified organic silicon defoamer. The defoamer has the advantages of being low in surface tension, high in defoaming speed, long in foam inhibition time, small in dosage, free of toxicity and harm to strains, wide in application range and the like.

Description

technical field [0001] The invention relates to the technical field of defoamers, in particular to a polyether-modified silicone defoamer which is safe to bacteria and a preparation method thereof. Background technique [0002] Defoamer is one of the indispensable additives in many productions. It has been widely used in various fields such as chemical industry, food, textile, paint, petroleum, papermaking and printing and dyeing. There are many types of defoamers with different properties. According to the composition, they can be divided into mineral oil defoamers, polyether defoamers, silicone defoamers and polyether modified silicone defoamers. Polyether defoamers are non-toxic, odorless, good in water dispersion, and have strong foam suppression ability, but their low foam breaking rate cannot effectively extinguish a large amount of foam. Silicone defoaming agent has high defoaming ability and good chemical stability, and is widely used, but its antifoaming ability i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04
CPCB01D19/0409
Inventor 陈士海杨柏忠
Owner JIANGSU SAIOUXINYUE DEFOAMER
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