Preparation process of ultralow-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 and the like, achieves high purity, low ring content, and improves one-time yield. rate effect

Active Publication Date: 2017-08-11
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 sieves in advance, and add the treated hexamethyldisiloxane and dimethylcyclosiloxane to 1000ml of In the flask, start to heat up, and at the same time pass dry nitrogen into the flask, pull out water for half an hour, heat up to 80°C, add dry 602 resin, react at 80°C for 8h, 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 lower fraction at 91°C / -90KPa is cut off, which is octamethyltrisiloxane, with a yield of 8%, and its purity is 99.8% by analysis; cut off at 127°C / -90KPa lower fraction, the yield reaches 9%, and its purity is 99.1% by analysis; the lower fraction of 158°C / 90KPa is intercepted, the yield is 9%, and its purity is 98.5% by analysis; then it is rectified at 163 / -90KPa to No liquid flows out, gets still liquid, and yield is 63%, and its viscosity of analysis is 5.1mm 2...

Embodiment 2

[0025] Use a pump to transport hexamethyldisiloxane and octamethylcyclotetrasiloxane from their respective storage tanks to the molecular sieve adsorbent cartridge, pass through the adsorbent cartridge and pour into the 8000L enamel reaction kettle, hexamethyldisiloxane and The mass ratio of octamethylcyclotetrasiloxane is controlled at 35:65, and the total feeding amount is 5000L. The reaction kettle is heated by low-pressure steam, and nitrogen is introduced into the kettle through the bottom insertion tank, and the water is pulled out for 45 minutes, and the temperature rises. To 70°C, add the pre-dried catalyst, balance the reaction at 70°C for 10 hours, the viscosity will not change, transfer the material to the filter and filter, then transfer to the rectification tower kettle, turn on the vacuum system, set the rectification parameters, intercept The lower fraction at 91°C / -90KPa is octamethyltrisiloxane, with a yield of 8%, and its purity is 99.5%; the lower fraction at...

Embodiment 3

[0027] Use a pump to transport hexamethyldisiloxane and octamethylcyclotetrasiloxane from their respective storage tanks to the molecular sieve adsorbent cartridge, pass through the adsorbent cartridge and pour into the 8000L enamel reaction kettle, hexamethyldisiloxane and The mass ratio of octamethylcyclotetrasiloxane is controlled at 20:80, the total feeding amount is 5000L, the reactor is heated by low-pressure steam, and nitrogen gas is introduced into the kettle through the bottom insertion tank, and the water is pulled out for 45 minutes. Raise the temperature to 60°C, add the pre-dried catalyst, and react at 60°C for 13 hours. The viscosity will not change. Transfer the material to the filter and then transfer it to the rectification tower kettle. Turn on the vacuum system and set the rectification parameters. Cut off the lower fraction at 91°C / -90KPa, which is octamethyltrisiloxane, with a yield of 6%, and analyze its purity to 99.5%; cut off the lower fraction at 127°...

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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] Simethicone is a colorless, odorless, transparent liquid with low surface tension, high surface activity, excellent defoaming and anti-foaming properties, and good film-forming properties. Simethicone is hydrophobic and insoluble in water. Simethicone oil has good isolation from other substances and has excellent lubricating performance. It has the function of blocking moisture without affecting the breathability. Simethicone has little change in viscosity over 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. Simethicone oil has good electrical properties, es...

Claims

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Application Information

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