Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Continuous production process of polydimethylsiloxane

A technology for the preparation of polydimethylsiloxane, which is applied in the field of continuous preparation of polydimethylsiloxane, and can solve the problem of cumbersome polydimethylsiloxane process steps, low product quality, and long reaction time and other issues to achieve high production efficiency, lower production costs, and stable quality

Pending Publication Date: 2019-12-10
TANGSHAN SANYOU SILICON IND
View PDF3 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the production process of polydimethylsiloxane, it is widely used in the industry to prepare polydimethylsiloxane (D4 or DMC) and hexamethyldisiloxane by batch reaction of low molar mass. However, the process steps for preparing polydimethylsiloxane by this method are cumbersome, the reaction time is long, and other impurities are contained in the reaction product, and the product quality is low

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Continuous production process of polydimethylsiloxane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A continuous preparation process of polydimethylsiloxane, carried out as follows:

[0026] Raw material feed ratio is as follows:

[0027] Hexamethyldisiloxane: 5.8kg / h; siloxane mixed ring body 619kg / h; the mass ratio of hexamethyldisiloxane to siloxane mixed ring body is 1:106.7.

[0028] A. Raw material pretreatment: the siloxane mixed ring body is dehydrated through the thin film evaporator-1 and the desiccant fixed bed 2, and the metal ions are removed through the activated carbon fixed bed 3 and the ion exchange resin bed 4, and the thin-film evaporator-1 The operating temperature is 70°C and the vacuum degree is -0.08Mpa.

[0029] B. Preheating: Hexamethylsiloxane and siloxane mixed rings are mixed in a static mixer at a mass ratio of 1:106.7, and then enter the preheater 5 to preheat to 80°C.

[0030] C. Telomerization: After preheating, the material enters the tube reactor 6 for equilibrium reaction, and the tube is filled with cationic acid resin, the reacti...

Embodiment 2

[0036] Raw material feed ratio is as follows:

[0037] Hexamethyldisiloxane: 11kg / h; siloxane mixed ring body 614kg / h; the mass ratio of hexamethyldisiloxane to siloxane mixed ring body is 1:55.8.

[0038] A. Raw material pretreatment: the siloxane mixed ring body is dehydrated through the thin film evaporator-1 and the desiccant fixed bed 2, and the metal ions are removed through the activated carbon fixed bed 3 and the ion exchange resin bed 4, and the thin-film evaporator-1 The operating temperature is 70°C and the vacuum degree is -0.08Mpa.

[0039] B. Preheating: Hexamethylsiloxane and siloxane mixed rings are mixed in a static mixer at a mass ratio of 1:55.8, and then enter a preheater to preheat to 80°C.

[0040] C. Telomerization: After preheating, the material enters the tube reactor 6 for equilibrium reaction, and the tube is filled with cationic acid resin, the reaction temperature is 80°C, and the reaction residence time is 1 hour.

[0041] D. Purification: After...

Embodiment 3

[0046] Hexamethyldisiloxane: 9kg / h; siloxane mixed ring body 619kg / h; the mass ratio of hexamethyldisiloxane to siloxane mixed ring body is 1:68.7.

[0047] A. Raw material pretreatment: the siloxane mixed ring body is dehydrated through the thin film evaporator-1 and the desiccant fixed bed 2, and the metal ions are removed through the activated carbon fixed bed 3 and the ion exchange resin bed 4, and the thin-film evaporator-1 The operating temperature is 70°C and the vacuum degree is -0.08Mpa.

[0048] B. Preheating: Hexamethylsiloxane and siloxane mixed rings are mixed in a static mixer at a mass ratio of 1:68.7, and then enter a preheater to preheat to 80°C.

[0049] C. Telomerization: After preheating, the material enters the tube reactor 6 for equilibrium reaction, and the tube is filled with cationic acid resin, the reaction temperature is 80°C, and the reaction residence time is 1 hour.

[0050] D. Purification: After telomerization, the silicone oil passes through t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a production process of dimethylsiloxane, in particular to a continuous preparation process of polydimethylsiloxane. A siloxane hybrid ring is subjected to water removing through a first film evaporator and a drying agent fixed bed and subjected to metal ion removing through an activated carbon fixed bed and an ion exchange resin bed; hexamethylsiloxane and the siloxane hybrid ring are mixed by a static mixer according to the mass ratio of 1:(2 to 200), and then a mixture enters a preheater to be preheated to 70-90 DEG C; a preheated material enters a tubular reactor to be subjected to an equilibrium reaction, row tubes are filled with catalysts, the reaction temperature is 70-90 DEG C, and the reaction residence time is 0.5-2 hours; residual acidic materials and other impurities are adsorbed through a filter device; low molecules are removed through a second film evaporator, the vacuum degree is 0 to minus 0.099 MPa, and the degreasing temperature is 150-250 DEG C; and a finished product with the low molecules removed is cooled, then filtered and packaged. The production efficiency is significantly improved, and the product quality is stabilized.

Description

technical field [0001] The invention relates to a production process of dimethylsiloxane, in particular to a continuous preparation process of polydimethylsiloxane. Background technique [0002] In the production process of polydimethylsiloxane, it is widely used in the industry to prepare polydimethylsiloxane (D4 or DMC) and hexamethyldisiloxane by batch reaction of low molar mass. However, the process steps for preparing polydimethylsiloxane by this method are cumbersome, the reaction time is long, and other impurities are contained in the reaction product, so the product quality is low. Contents of the invention [0003] In order to solve the above-mentioned technical problems, the present invention proposes a continuous preparation process of polydimethylsiloxane with high efficiency and good product quality. [0004] The present invention adopts following technical scheme: [0005] A continuous preparation process for polydimethylsiloxane, comprising the steps of: ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/04C08G77/06
CPCC08G77/04C08G77/06
Inventor 任海涛刘彬赵洁曹鹤李献起张鹏硕刘秋艳严锦河赵磊胡质云赵景辉倪志远刘思佳崔磊高金明
Owner TANGSHAN SANYOU SILICON IND
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com