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Production method and production system of low-volatile vinyl silicone oil

A technology of vinyl silicone oil and production method, which is applied in the field of production method and production system implementing the method, can solve the problems of limited application and expensive equipment, and achieve the effects of convenient procurement, short production cycle and wide application viscosity

Active Publication Date: 2018-06-01
ZHEJIANG FORST NEW MATERIAL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the equipment of pressurized fluid extraction (supercritical extraction) is very expensive, and the price of a set of industrialized supercritical extraction equipment reaches one million RMB, which greatly limits the application of this technology

Method used

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  • Production method and production system of low-volatile vinyl silicone oil
  • Production method and production system of low-volatile vinyl silicone oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1 The production system of a low-volatility vinyl silicone oil shown starts from the dehydration kettle, which is connected to the reaction kettle, the storage tank, and the centrifugal extraction unit in sequence. The two-phase outlets of the centrifugal extraction unit are respectively connected to the thin film evaporator and the rectification tower.

[0026] The centrifugal extraction unit is composed of three centrifugal extraction machines in series, and the silicone oil feed and solvent feed are realized by metering pumps and the feeding speed is controlled.

[0027] The production method of low volatile vinyl silicone oil is as follows:

[0028] Add octamethylcyclotetrasiloxane and tetramethyldivinyldisiloxane to the dehydration kettle at a mass ratio of 290:1, remove water under reduced pressure and nitrogen gas, and then add catalyst tetramethylhydroxide For ammonium alkali gel, the ratio of the catalyst mass to the total mass of the material i...

Embodiment 2

[0035] Such as figure 1 The production system of a low-volatility vinyl silicone oil shown starts from the dehydration kettle, which is connected to the reaction kettle, the storage tank, and the centrifugal extraction unit in sequence. The two-phase outlets of the centrifugal extraction unit are respectively connected to the thin film evaporator and the rectification tower.

[0036] Wherein the centrifugal extraction unit is composed of 4 centrifugal extraction machines connected in series, and the silicone oil feed and the solvent feed are realized by a metering pump (not shown in the figure) and the feeding speed is controlled.

[0037] The production method of low volatile vinyl silicone oil is as follows:

[0038]Add octamethylcyclotetrasiloxane and tetramethyldivinyldisiloxane to the dehydration kettle at a mass ratio of 180:1, remove water under reduced pressure and nitrogen, and then add catalyst tetramethyl hydroxide For ammonium alkali gel, the ratio of the catalyst...

Embodiment 3

[0045] Such as figure 1 The production system of a low-volatility vinyl silicone oil shown starts from the dehydration kettle, which is connected to the reaction kettle, the storage tank, and the centrifugal extraction unit in sequence. The two-phase outlets of the centrifugal extraction unit are respectively connected to the thin film evaporator and the rectification tower.

[0046] The centrifugal extraction unit is composed of one centrifugal extraction machine connected in series, and the feeding of silicone oil and solvent is realized by a metering pump (not shown in the figure) and the feeding speed is controlled.

[0047] The production method of low volatile vinyl silicone oil is as follows:

[0048] Add octamethylcyclotetrasiloxane and tetramethyldivinyldisiloxane to the dehydration kettle at a mass ratio of 60:1, remove water under reduced pressure and nitrogen gas, and then add catalyst tetramethyl hydroxide For ammonium alkali glue, the ratio of the catalyst mass ...

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Abstract

The invention discloses a production method and a production system of low-volatile vinyl silicone oil. A centrifugal extraction technology is introduced into a synthesis process of vinyl silicone oil, and the vinyl silicone oil is centrifugally extracted to reduce the content of a siloxane ring body. The vinyl silicone oil obtained by centrifugal extraction is taken into a thin film evaporator toremove a solvent to obtain the low-volatile vinyl silicone oil; the solvent obtained by centrifugal extraction is recovered by using a rectifying tower. According to the production method and the production system of the low-volatile vinyl silicone oil, the volatile of vinyl silicone oil is reduced from 0.8wt. % and higher to within 0.1wt. %, equipment costs and production energy consumption arereduced, a production cycle is shortened, and materials can be recycled. At the same time, by changing extraction conditions, solvent types and ratios, the volatile content of products can be easily and accurately controlled and the low-volatile vinyl silicone oils with different quality requirements is produced.

Description

technical field [0001] The invention belongs to the technical field of silicone oil production technology, and relates to a method for producing linear silicone oil by using a siloxane ring body, in particular to a production method for low-volatile vinyl silicone oil and a production system for implementing the method. technical background [0002] Vinyl silicone oil is an important raw material in the silicone industry, and is the basic material for high-temperature vulcanized silicone rubber and liquid addition silicone rubber. [0003] At present, in industrial production, vinyl silicone oil is generally prepared by mixed siloxane catalytic equilibrium method, using DMC (dimethylcyclosiloxane) or D4 (octamethylcyclotetrasiloxane) as raw material, dehydrated in nitrogen ring-opening polymerization under these conditions. Due to the chemical balance in the polymerization reaction, there is always a part of the raw materials that cannot be ring-opened, so the vinyl silicon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/34C08G77/20
CPCC08G77/20C08G77/34
Inventor 江昊高传花张利安韩志远刘正伟王林林天翼
Owner ZHEJIANG FORST NEW MATERIAL RES INST CO LTD
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