Preparation method of double-rotor type organosilicone defoaming agent

A silicone defoamer, Gemini-type technology, applied in separation methods, chemical instruments and methods, foam dispersion/prevention, etc., can solve problems such as poor defoaming speed, temperature sensitivity, etc., achieve small surface tension, overcome extreme Poor performance, improved stability and dispersibility

Inactive Publication Date: 2018-11-13
南通斯恩特纺织科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its defoaming speed is not good, and it is sensitive to temperature, so it needs to be used above the cloud point

Method used

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  • Preparation method of double-rotor type organosilicone defoaming agent

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specific Embodiment 1

[0025] The present invention provides a kind of preparation method of gemini type organosilicon defoamer, it comprises the steps:

[0026] 1. Preparation process of hydrogen-terminated silicone oil:

[0027] The raw material of the hydrogen-terminated silicone oil includes 1 part by weight of a hydrogen-terminated double-header, 3 parts by weight of a molecular chain extender, and 0.1 part by weight of an acid catalyst; wherein, the hydrogen-terminated double The head-sealing agent is 1,1,3,3-tetramethyldisiloxane, the molecular chain extender is octamethylcyclotetrasiloxane (D4), and the acid catalyst is concentrated sulfuric acid catalyst;

[0028] The preparation method of the hydrogen-terminated silicone oil comprises the following steps: adding octamethylcyclotetrasiloxane (D4), hydrogen-containing double-capping agent and concentrated Sulfuric acid catalyst, slowly warming up to 35°C for 6.5 hours to obtain hydrogen-terminated silicone oil.

[0029] 2. Preparation proc...

specific Embodiment 2

[0035] The present invention provides a kind of preparation method of gemini type organosilicon defoamer, it comprises the steps:

[0036] 1. Preparation process of hydrogen-terminated silicone oil:

[0037] The raw material of the hydrogen-terminated silicone oil includes 2 parts by weight of a hydrogen-terminated double head agent, 12 parts by weight of a molecular chain extender, and 0.2 parts by weight of an acid catalyst; The head-sealing agent is 1,1,3,3-tetramethyldisiloxane, the molecular chain extender is octamethylcyclotetrasiloxane (D4), and the acid catalyst is concentrated sulfuric acid catalyst;

[0038] The preparation method of the hydrogen-terminated silicone oil comprises the following steps: adding octamethylcyclotetrasiloxane (D4), hydrogen-containing double-capping agent and concentrated Sulfuric acid catalyst, slowly warming up to 40°C for 7 hours to obtain hydrogen-terminated silicone oil.

[0039] 2. Preparation process of hydroxyl-terminated polyethe...

specific Embodiment 3

[0045] The present invention provides a kind of preparation method of above-mentioned hydroxyl-terminated polyether modified organosilicon, it comprises the following steps:

[0046] 1. Preparation process of hydrogen-terminated silicone oil:

[0047] (1) The raw materials for preparing hydrogen-terminated silicone oil include hydrogen-terminated double-capping agent, molecular chain extender and acid catalyst, and the parts by weight of the hydrogen-terminated double-capping agent, molecular chain extender and acid catalyst are respectively 1 part, 6.41 and 0.15 parts, wherein, the hydrogen-terminated double-capping agent is 1,1,3,3-tetramethyldisiloxane, the molecular chain extender is octamethylcyclotetrasiloxane famous D4, and the acid catalyst is concentrated sulfuric acid.

[0048] (2) The preparation method of hydrogen-terminated silicone oil comprises as follows successively: add 27.6 grams of octamethylcyclotetrasiloxane, 10 grams of hydrogen-terminated double-cappin...

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Abstract

The invention discloses a preparation method of a double-rotor type organosilicone defoaming agent. The double-rotor type organosilicone defoaming agent is mainly of a double hydroxyl-terminated structure, and has the advantages that the convenience is realized in industrial defoaming, the stability and dispersivity of an emulsion are improved, the storage time is guaranteed, and the defoaming efficiency is greatly improved; the preparation technology is simple and convenient, and the raw materials are easy to obtain.

Description

technical field [0001] The invention belongs to the field of chemical additives, and in particular relates to a preparation method of a gemini-type organosilicon defoamer. Background technique [0002] Many harmful foams are often produced in the process of industrial production, which requires defoamers to eliminate and suppress them. The defoamers commonly used in industry are generally divided into three categories: organic defoamers, silicone defoamers and polyether defoamers. The performance of polyether and silicone defoamers is the best, and the modification and development of new varieties of these two types of defoamers are also active. [0003] Polyether defoamer is a non-ionic surfactant with excellent performance prepared by ring-opening polymerization of ethylene oxide and propylene oxide. Widely used in water systems, it has good hydrophilicity and anti-foaming properties. However, its defoaming speed is not good, and it is sensitive to temperature, so it ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04C08G77/46C08G77/12C08G77/08
CPCB01D19/0409C08G77/08C08G77/12C08G77/46
Inventor 王海峰陈颖徐锦锦边振浩李娇管永华
Owner 南通斯恩特纺织科技有限公司
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