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Preparation method of dimethicone and application thereof

A technology of simethicone oil and methyl siloxane, which is applied in the field of preparation of simethicone oil with low hydroxyl content, can solve the problems of poor product performance, low production efficiency, uneven technical level, etc., and achieve stable product quality , low hydroxyl content and high production efficiency

Inactive Publication Date: 2016-11-02
JIANGMEN SHENGPENG CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many manufacturers of simethicone oil in China, and the technical level is uneven, and most companies still use the intermittent method to produce low-viscosity silicone oil, resulting in low production efficiency, large fluctuations in product batch quality, poor product performance, and low utilization of by-products. low level problem
At present, domestic silicone oil has insufficient control in terms of hydroxyl content, ion content, and solid content, which leads to its high content, making it difficult for silicone oil to enter the high-end market

Method used

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preparation example Construction

[0028] The preparation method of simethicone oil comprises the steps:

[0029] 1) Add methylsiloxane, hexamethylsiloxane, and acidic catalyst to the reaction kettle, stir and heat up to 70-75°C under vacuum conditions for reaction;

[0030] 2) After the reaction is over, let it stand for stratification, and release the reacted acidic catalyst from the bottom valve of the reactor;

[0031] 3) Add 15% sodium carbonate aqueous solution to the reaction kettle and stir to adjust the pH to 7-8 to obtain a neutral upper oil crude product;

[0032] 4) Stand still to remove water, remove low boilers from the crude oil product, cool and filter to obtain simethicone oil.

[0033] The weight ratio of methyl siloxane and hexamethyl siloxane in step 1) of the present invention is 5:0.8-4, methyl siloxane and acid catalyst are added at the same time and mixed evenly, then Adding hexamethylsiloxane and stirring, the purpose is to reduce the amount of acidic catalyst and improve the reaction...

Embodiment approach 1

[0045] Embodiment 1, the preparation method of simethicone oil, comprises the steps:

[0046] 1) Add methylsiloxane, hexamethylsiloxane, and acidic catalyst to the reaction kettle, stir and heat up to 70-75°C under vacuum conditions for reaction;

[0047] 2) After the reaction is over, let it stand for stratification, and release the reacted acidic catalyst from the bottom valve of the reactor;

[0048] 3) Add 15% sodium carbonate aqueous solution to the reaction kettle and stir to adjust the pH to 7-8 to obtain a neutral upper oil crude product;

[0049] 4) Stand still to remove water, remove low boilers from the crude oil product, cool and filter to obtain simethicone oil.

Embodiment approach 2

[0050] Embodiment 2 is the same as Embodiment 1, except that the reaction time in step 1) is 1.5-2 hours.

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Abstract

The invention relates to a preparation method of an organosilicone product, more specifically to a preparation method of dimethicone with low hydroxyl content and application thereof. The method comprises the following steps: adding methylsiloxane, hexamethylsiloxane and an acid catalyst into a reaction kettle, stirring and heating to 70-75 DEG C under vacuum condition to carry out a reaction; standing for layering after the reaction, and releasing the reacted acid catalyst from the bottom valve of the reaction kettle; adding 15% of a sodium carbonate aqueous solution into the reaction kettle and stirring, and adjusting pH to 7-8 to obtain a neutral upper-layer oil crude product; standing and removing water, removing low-boiling-point substances from the oil crude product, cooling and filtering so as to obtain dimethicone. The dimethicone prepared by the above method has high conversion rate and low hydroxyl content. The product quality is stable, and production efficiency is high.

Description

technical field [0001] The present invention relates to a kind of preparation method of organosilicon product, more specifically, the present invention relates to a kind of preparation method and application of dimethyl silicone oil with low hydroxyl content. Background technique [0002] Simethicone is a non-toxic, non-corrosive transparent liquid with physiological inertness, good chemical stability, electrical insulation and weather resistance, low freezing point and vapor pressure, high flash point and high ignition point, good hydrophobicity, and low surface area. Wide range of tension and viscosity, can be used for a long time at the temperature of -50-200 ℃, widely used as moisture-proof insulation, lubrication, shockproof, and cold and heat carrier, as well as defoaming, mold release, paint, coating, rubber and plastic and daily cosmetics and other additives. [0003] In recent years, under the condition that the entire silicone market has developed well, simethicon...

Claims

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Application Information

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IPC IPC(8): C08G77/06C08G77/34C08L83/04
CPCC08G77/06C08G77/34C08L83/04
Inventor 钟振迎钟洪扩吴庆生文秀华
Owner JIANGMEN SHENGPENG CHEM IND CO LTD
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