A kind of preparation technology of ultra-low viscosity dimethyl silicone oil

A technology of dimethyl silicone oil and preparation process, which is applied in the field of preparation technology of ultra-low viscosity dimethyl silicone oil, can solve the problems of long process flow, increased equipment investment, etc. rate effect

Active Publication Date: 2020-09-04
JIANGXI BLUESTAR XINGHUO SILICONE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent is only suitable for the preparation of less than 50-1000mm 2 / s of simethicone oil, not suitable for the preparation of less than 50mm 2 Silicon oil below / s; and this patent uses adsorption filtration and ultrafiltration membrane filtration, which increases equipment investment and has a long process flow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Treat hexamethyldisiloxane and dimethylcyclosiloxane with molecular sieve in advance, and add the processed hexamethyldisiloxane and dimethylcyclosiloxane to 1000ml in a mass ratio of 2:3 In the flask, start the temperature rise, and at the same time pass dry nitrogen into the flask, pull out the water for half an hour, heat up to 80°C, add dry 602 resin, and react at 80°C for 8 hours. The viscosity does not change. Cool down to room temperature, filter, and The filtrate is transferred to a flask with a rectification tower for rectification, and the fraction at 91°C / -90KPa is intercepted, which is octamethyltrisiloxane with a yield of 8%, and its purity is 99.8% by analysis; intercept 127°C The yield of the fraction under / -90KPa reached 9%, and its purity was 99.1% by analysis; the fraction under 158℃ / 90KPa was intercepted, and the yield was 9%, and its purity was analyzed as 98.5%; and then rectified at 163 / -90KPa to No liquid flows out, take the kettle liquid, the yie...

Embodiment 2

[0025] Use a pump to transport hexamethyldisiloxane and octamethylcyclotetrasiloxane from their respective storage tanks to the molecular sieve adsorbent cylinder, after passing through the adsorbent cylinder, into the 8000L enamel reactor, hexamethyldisiloxane and The mass ratio of octamethylcyclotetrasiloxane is controlled at 35:65, and the total feed volume is 5000L. The reaction kettle is heated by low-pressure steam, and nitrogen is introduced into the kettle through the bottom inserted tank, and the water is drawn for 45 minutes, and the temperature is raised. At 70°C, add the pre-dried catalyst, equilibrate the reaction at 70°C for 10h, the viscosity will not change anymore, transfer the material to the filter and then transfer to the rectification tower, turn on the vacuum system, set the rectification parameters, and intercept The fraction at 91°C / -90KPa is octamethyltrisiloxane with a yield of 8%, and its purity is 99.5% by analysis; the fraction at 127°C / -90KPa is int...

Embodiment 3

[0027] Use a pump to transport hexamethyldisiloxane and octamethylcyclotetrasiloxane from their respective storage tanks to the molecular sieve adsorbent cylinder, after passing the adsorbent cylinder, into the 8000L enamel reactor, hexamethyldisiloxane and The mass ratio of octamethylcyclotetrasiloxane is controlled at 20:80, and the total feed volume is 5000L. The reaction kettle is heated by low-pressure steam, and nitrogen is introduced into the kettle through the bottom of the tank, and the water is drawn for 45 minutes. The temperature is raised to 60°C, the pre-dried catalyst is added, and the reaction is equilibrated at 60°C for 13 hours. The viscosity does not change. The material is transported to the filter and then transferred to the rectification tower kettle, the vacuum system is turned on, and the distillation parameters are set The fraction at 91℃ / -90KPa is intercepted, which is octamethyltrisiloxane, the yield reaches 6%, and its purity is 99.5% analyzed; the fr...

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PUM

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Abstract

The invention discloses a preparation process of ultralow-viscosity dimethyl silicone oil. Low-molecule separation of dimethyl silicone oil is performed in a rectification manner, high-boiling-point components can be reserved to the greatest extent and low-boiling-point components can be separated to the greatest extent under the set rectification conditions, the content of octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane and other molecules in the ultralow-viscosity dimethyl silicone oil with the higher boiling point can be further better controlled, application requirements in certain special high-end application fields such as the personal care industry can be met, besides, ultralow-viscosity linear dimethyl silicone oil with the lower boiling pointer can be captured from rectification fractions, and the one-time yield of a reaction is increased.

Description

Technical field [0001] The invention relates to a preparation process of ultra-low viscosity dimethyl silicone oil, in particular to a preparation process of ultra-low viscosity dimethyl silicone oil suitable for use in the personal care industry. Background technique [0002] Dimethicone is a colorless, odorless, transparent liquid with low surface tension, high surface activity, excellent defoaming and anti-foaming properties and good film-forming properties. Dimethicone is hydrophobic and insoluble in water. Dimethicone has good isolation from other substances and has better lubricating properties. Without affecting the air permeability, it has the performance of blocking moisture. Dimethicone has little viscosity change in a wide temperature range. Excellent heat resistance and acid resistance. It has stable chemical properties, high boiling point, low freezing point, and a wide temperature range as a liquid. Dimethicone has good electrical properties, especially in vari...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/06
CPCC08G77/06
Inventor 曹姣洁
Owner JIANGXI BLUESTAR XINGHUO SILICONE CO LTD
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