Defoaming agent

A defoamer and catalyst technology, applied in the direction of foam dispersion/prevention, chemical instruments and methods, liquid degassing, etc., can solve the problems of product and equipment impact, impact on defoaming performance, oil floating, etc. The effect of long soaking time and strong defoaming ability

Pending Publication Date: 2020-01-14
SHANGHAI BAOLIJIA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been found in practical applications that although silicone defoamers have the advantages of strong defoaming ability and long foam suppression time, ordinary silicone emulsions are prone to demulsification and oil floating under high temperature and strong alkali conditions, which seriously affect The defoaming performance under the condition of high temperature and strong alkali is not guaranteed, and it may also have a certain impact on the product and equipment

Method used

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Examples

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preparation example Construction

[0080] The second aspect of the present invention provides a kind of preparation method of defoamer, and described preparation method comprises the following steps:

[0081] (1) Preparation of organosilicon composition:

[0082] Mix and stir silicone oil and MQ silicone resin, heat to 110-170°C, add white carbon black, keep warm at 130-190°C for 1.5-5.5h, and wait until the temperature drops to 35-50°C to obtain the product.

[0083] (2) Preparation of defoamer:

[0084] Mix the silicone composition, hydrogen-containing polysiloxane, vinyl polysiloxane, and allyl polyether evenly, raise the temperature to 60-70°C, then add the catalyst, raise the temperature to 90-110°C, and set the temperature at 250-350rpm React for 0.5~1.0h under stirring condition; cool down to 70~75℃, add emulsifier and preservative, mix under stirring condition of 250~350rpm for 0.3~0.6h; 0.3 ~ 0.6h, and keep the temperature at 70 ~ 75 ℃, that is.

[0085] In a preferred embodiment, the concentration ...

Embodiment 1

[0090]Example 1 provides a defoamer. In parts by weight, the preparation raw materials include at least: 20 parts of silicone composition, 5 parts of hydrogen-containing polysiloxane, 5 parts of vinyl polysiloxane, allyl polysiloxane 6 parts of ether, 1 part of catalyst, 10 parts of emulsifier, 2 parts of thickener, 2 parts of preservative, 70 parts of water.

[0091] The silicone composition is a combination of silicone oil, hydrophobic white carbon black, and MQ silicone resin, wherein the weight ratio of white carbon black, silicone oil, and MQ silicone resin is 1:18:2.

[0092] The silicone oil is a composition of dimethyl silicone oil and hydroxy silicone oil, wherein the mass ratio of dimethyl silicone oil and hydroxy silicone oil is 3.5:1.

[0093] The viscosity of the simethicone oil is 50000mPa·s (25°C), and the purchaser is Jinan Xushun Chemical Co., Ltd.

[0094] The hydroxyl mass percentage of the hydroxy silicone oil is 3.8%, and the purchaser is Guangzhou Putai ...

Embodiment 2

[0110] Example 2 provides a defoamer. In parts by weight, the preparation raw materials include at least: 10 parts of silicone composition, 1 part of hydrogen-containing polysiloxane, 1 part of vinyl polysiloxane, allyl polysiloxane 2 parts ether, 0.1 part catalyst, 5 parts emulsifier, 1 part thickener, 1 part preservative, 50 parts water.

[0111] The silicone composition is a combination of silicone oil, hydrophobic white carbon black, and MQ silicone resin, wherein the weight ratio of white carbon black, silicone oil, and MQ silicone resin is 1:18:2.

[0112] The silicone oil is a composition of dimethyl silicone oil and hydroxy silicone oil, wherein the mass ratio of dimethyl silicone oil and hydroxy silicone oil is 3.5:1.

[0113] The viscosity of the simethicone oil is 50000mPa·s (25°C), and the purchaser is Jinan Xushun Chemical Co., Ltd.

[0114] The hydroxyl mass percentage of the hydroxy silicone oil is 3.8%, and the purchaser is Guangzhou Putai New Material Co., Lt...

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Abstract

The invention relates to the technical field of chemical additives, and specifically discloses a defoaming agent. The defoaming agent is at least prepared from the following preparation raw materials:10 to 30 parts of an organic silicon composition, 1 to 10 parts of hydrogen-containing polysiloxane, 1 to 10 parts of vinyl polysiloxane, 2 to 12 parts of allyl polyether, 0.1 to 2 parts of a catalyst, 5 to 20 parts of an emulsifier, 1 to 5 parts of a thickener, 1 to 5 parts of a preservative and 50 to 90 parts of water. The organic silicon defoaming agent which is high in defoaming speed, long in foam inhibition time, excellent in dispersing performance and outstanding in defoaming durability is prepared through a special formula and process, and what's more important, the defoaming agent prepared through the preparation method is good in product stability, not prone to demulsification and free of oil floating under the conditions of high temperature and strong alkali, and the preparation method is simple and low in cost.

Description

technical field [0001] The invention relates to the technical field of chemical additives, in particular to a defoamer. Background technique [0002] Foam is a ubiquitous natural phenomenon, and it is also an unstable system in thermodynamics. The appearance of foam has both advantages and disadvantages. Many harmful foams are often produced in some chemical production processes, such as the production of pesticide preparations, food fermentation, petrochemical, papermaking, sewage treatment, etc. If the generated foam cannot be defoamed in time, this will not only affect the product quality, but also lead to a decrease in production efficiency, so that the product cannot be packaged in time. The most effective and economical way to eliminate foam is to add a defoamer. It can be seen that the research on defoamers It is of great significance to industrial production. [0003] At present, there are many types of defoamers at home and abroad, most of which are liquid compoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04
CPCB01D19/0404B01D19/0409
Inventor 闫鹏洁房迎春袁宜恩
Owner SHANGHAI BAOLIJIA NEW MATERIAL CO LTD
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