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Method for mechanically dispersing high-viscosity organic silicon composition

A technology of mechanical dispersion and high viscosity, applied in the field of silicone emulsion preparation, can solve the problems of difficulty in controlling the degree of crosslinking of silicone polyether, high cost, and difficulty in controlling emulsion stability.

Active Publication Date: 2011-05-18
JIANGSU SIXIN SCI-TECH APPL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] U.S. Patent No. 4,853,474 introduces a method for improving the low-temperature resistance of the emulsion by adding cross-linked silicon polyether, but this method is difficult to control the The degree of cross-linking, the stability of the obtained emulsion is also difficult to control
EP-A-163541 introduced high-viscosity polysiloxane emulsions to be difficult to prepare when studying defoamers, requiring high costs and poor results
Patent CN101298027 introduces a method for dispersing high-viscosity silicone emulsifiers using high-viscosity silicone emulsifiers, but the production of high-viscosity silicone emulsifiers is difficult
Patent CN101348571 introduced the method of adding low-molecular-weight polysiloxane to improve emulsion stability, but the addition of low-molecular-weight polysiloxane will affect the anti-foaming performance of the emulsion

Method used

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  • Method for mechanically dispersing high-viscosity organic silicon composition
  • Method for mechanically dispersing high-viscosity organic silicon composition

Examples

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preparation example Construction

[0039] Preparation of high viscosity silicone composition:

[0040] Refer to the preparation method of Example 1 in US4639489 to prepare a high-viscosity silicone composition: 378g of polydimethylsiloxane with a viscosity of 100,000mPa·s and 180g of polydimethylsiloxane with a viscosity of 10,000mPa·s with hydroxyl groups at both ends Siloxane and 18g tetraethyl orthosilicate were put into the reaction kettle bottle, heated to 130-140°C, and then 3g catalyst was added thereto (catalyst preparation: 90g polydimethylsiloxane with a viscosity of 1,000mPa·s React with 10g KOH at 120°C for 15min), stir and continue heating. Then, add 30g to it and the specific surface area is 200m 2 / g of white carbon black was homogenized with a homogenizer. The reaction composition was heated to 180° C. and maintained for 4 hours, and cooled to room temperature to obtain a viscous liquid which was a high-viscosity silicone composition with a viscosity of 400,000 mPa·s.

Embodiment 1

[0042] Get 100 parts of high-viscosity silicone composition in embodiment 1, 10 parts of sorbitan monolaurate, 10 parts of polyoxyethylene (40) sorbitan monolaurate, 15 parts of N-90 and 15 parts Part N-28 (polyoxyethylene ether modified polysiloxane, self-produced by Nanjing Sixin Technology Application Research Institute Co., Ltd.); after mixing the above raw materials, circulate in the colloid mill for 35 minutes, and keep the system temperature at 60°C; Slowly add water to it, and add 50 parts of water to obtain an emulsion intermediate with a mass concentration of 75%; raise the temperature of this intermediate to 80°C under stirring, and simultaneously turn on the emulsifier at a speed of 4500rpm and keep it for 35 minutes; then, keep the temperature of the system And the rotation speed of the emulsifier remains unchanged, and 100 parts of water is slowly added, and the mass concentration of the system is 50% at this time; finally, it is diluted with a polyacrylate aqueou...

Embodiment 2

[0044] Get 100 parts of the high-viscosity silicone composition in Example 1, 10 parts of octylphenol polyoxyethylene (30) ether, 10 parts of sorbitan trioleate, 20 parts of N-70 (polyoxyethylene ether modified Polysiloxane, self-produced by Nanjing Sixin Technology Application Research Institute Co., Ltd.); after mixing the above raw materials, circulate in the colloid mill for 40 minutes, keep the temperature of the system at 50 ° C; slowly add water to it, add 60 parts of water, and get Emulsion intermediate, its mass concentration is 70%; This intermediate is heated up to 60 ℃ under agitation, open emulsifier at the same time, rotating speed is 5000rpm, keep 40min; Then, keep system temperature and the rotating speed of emulsifying machine unchanged, slowly Add 150 parts of water, and the mass concentration of the system is 40% at this time; finally dilute it with an aqueous solution of xanthan gum to form an emulsion with a concentration of 35%.

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Abstract

The invention provides a method for mechanically dispersing a high-viscosity organic silicon composition, which solves the problem of difficulty in preparing high-viscosity organic silicon emulsions. The method comprises the following steps: (1) mixing a high-viscosity organic silicon composition with an emulsifier, circulating in a colloid mill at room temperature for 5-60 minutes, keeping the temperature of the system at 30-80 DEG C by using cooling water, and slowly adding water into the system until the mass concentration of the intermediate reaches 60-85%, thereby obtaining an emulsion intermediate; (2) while stirring, heating the emulsion intermediate to 60-85 DEG C, and meanwhile, starting an emulsifying machine to emulsify the emulsion intermediate at rotary speed of 1500-6000rpm for 10-60 minutes, wherein in the emulsifying process, water is added until the mass concentration of the emulsion reaches 20-60%; and (3) diluting the emulsion prepared in the step (2) to the required concentration by using a thickener. The emulsion prepared by using the method provided by the invention has the advantages of high stability, and excellent foam elimination and inhibition properties.

Description

technical field [0001] The invention relates to a method for dispersing a high-viscosity organosilicon composition in water by means of strong mechanical energy, more precisely, relates to a method for preparing an organosilicon emulsion, and belongs to the technical field of fine chemical preparations. technical background [0002] In modern industry, especially in textiles, cosmetics and other fields, the production links are all water-based systems, so to add silicone-based substances as additives, it is necessary to make it into an O / W type that is compatible with water. lotion. Silicone emulsions are widely used and can be used as textile finishing agents, fabric softeners, release agents, antiperspirants, defoamers, etc. [0003] There are generally two methods for preparing silicone emulsions: one is the emulsion polymerization method, and the other is the mechanical method. For high-viscosity silicone compositions, mechanical methods are mainly used for preparation...

Claims

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Application Information

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IPC IPC(8): C08J3/03C08L83/04
Inventor 钟翔吴飞曹添袁伟许勇
Owner JIANGSU SIXIN SCI-TECH APPL RES INST CO LTD
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