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

A kind of preparation method of alkoxy-terminated polydimethylsiloxane

A technology of hydroxypolydimethylsiloxane and dimethylsiloxane, which is applied in the field of preparation of alkoxy-terminated polydimethylsiloxane, which can solve the problem of poor storage stability, affecting production efficiency, and peak viscosity and other problems, to achieve the effect of high stability, high end-capping efficiency, and less addition

Active Publication Date: 2022-07-12
新纳奇材料科技江苏有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because organotin is used as the catalyst, it is easy to form a monoalkoxy polymer with no crosslinking activity, which has the problem of poor storage stability; if titanate is used as the catalyst, it will form due to the interaction between titanate and the terminal hydroxyl group of 107 silicone rubber. Viscosity peaks will appear in the false cross-linked state, seriously affecting production efficiency

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
  • A kind of preparation method of alkoxy-terminated polydimethylsiloxane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Follow the steps below to prepare alkoxy terminated polydimethylsiloxane:

[0026] (1) After mixing DMC and hexamethyldisiloxane, the temperature was raised to 170° C., phosphoric acid was added dropwise, stirred at a speed of 300 r / min for 7 hours, and water was removed by refluxing to obtain a silicon phosphate terminator, DMC, hexamethyldisiloxane The mass ratio of oxane and phosphoric acid is 70:10:15.

[0027] (2) heating the linear body to 150° C., adding a potassium hydroxide aqueous solution with a mass concentration of 10% and then stirring the polycondensation reaction, monitoring the viscosity on-line, and adding the silicon phosphate terminator obtained in step (1) before reaching the target viscosity of 1000 mPa·s, After the reaction was continued for 50 minutes, the low-boiling substances were removed by vacuum and reduced pressure distillation to obtain hydroxy silicone oil. The mass ratio of linear body, potassium hydroxide aqueous solution, and silicoph...

Embodiment 2

[0031] Follow the steps below to prepare alkoxy terminated polydimethylsiloxane:

[0032] (1) After mixing DMC and hexamethyldisiloxane, the temperature was raised to 170° C., phosphoric acid was added dropwise, stirred at a speed of 300 r / min for 7 hours, and water was removed by refluxing to obtain a silicon phosphate terminator, DMC, hexamethyldisiloxane The mass ratio of oxane and phosphoric acid is 70:10:15.

[0033] (2) heating the linear body to 150° C., adding a potassium hydroxide aqueous solution with a mass concentration of 10% and then stirring the polycondensation reaction, monitoring the viscosity on-line, and adding the silicophosphate terminator obtained in step (1) before reaching the target viscosity of 20000 mPa·s, After the reaction was continued for 50 minutes, the low-boiling substances were removed by vacuum and reduced pressure distillation to obtain hydroxy silicone oil. The mass ratio of linear body, potassium hydroxide aqueous solution, and silicopho...

Embodiment 3

[0037] Follow the steps below to prepare alkoxy terminated polydimethylsiloxane:

[0038] (1) After mixing DMC and hexamethyldisiloxane, the temperature was raised to 170° C., phosphoric acid was added dropwise, stirred at a speed of 300 r / min for 7 hours, and water was removed by refluxing to obtain a silicon phosphate terminator, DMC, hexamethyldisiloxane The mass ratio of oxane and phosphoric acid is 70:10:15.

[0039] (2) heating the linear body to 150° C., adding a potassium hydroxide aqueous solution with a mass concentration of 10% and then stirring the polycondensation reaction, monitoring the viscosity on-line, and adding the silicophosphate terminator obtained in step (1) before reaching the target viscosity of 20000 mPa·s, After the reaction was continued for 50 minutes, the low-boiling substances were removed by vacuum and reduced pressure distillation to obtain hydroxy silicone oil. The mass ratio of linear body, potassium hydroxide aqueous solution, and silicopho...

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

PropertyMeasurementUnit
viscosityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of alkoxy-terminated polydimethylsiloxane, which comprises the following steps: (1) after mixing DMC and hexamethyldisiloxane, the temperature is raised to 160-180° C., and dropwise adding Phosphoric acid, stirred for 6-8 hours, refluxed to remove water to obtain a silicophosphate terminator; (2) heating the linear body to 130-150 ° C, adding potassium hydroxide aqueous solution, stirring the polycondensation reaction, monitoring the viscosity online, before reaching the target viscosity Add the silicon phosphate terminator obtained in the step (1), continue to react for 5-50 minutes and then evacuated, and the low-boiling substances are removed by vacuum distillation to obtain α, ω-dihydroxy polydimethylsiloxane of different viscosity. The present invention adopts the preparation method of an alkoxy-terminated polydimethylsiloxane with the above structure, and the prepared alkoxy-terminated polydimethylsiloxane has high end-blocking efficiency, convenient production process and Better storage stability.

Description

technical field [0001] The invention relates to the technical field of organosilicon polymerization, in particular to a preparation method of an alkoxy-terminated polydimethylsiloxane. Background technique [0002] The traditional dealcoholized silicone rubber is generally made of 107 silicone rubber as the base, with fillers, cross-linking agents, catalysts, coupling agents, plasticizers, etc. Because organotin is used as catalyst, it is easy to generate monoalkoxy polymer without cross-linking activity, and there is a problem of poor storage stability; In the pseudo-crosslinking state, there will be a viscosity peak phenomenon, which will seriously affect the production efficiency. [0003] The alkoxy-terminated polydimethylsiloxane will not show a viscosity peak even if a titanate-based catalyst is used in the production of alcohol-based adhesives, which improves production efficiency and improves storage stability. After compound vulcanization, the color is transparent...

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 Patents(China)
IPC IPC(8): C08G77/20C08G77/18C08G77/08
CPCC08G77/20C08G77/18C08G77/08
Inventor 余跃徐守彬
Owner 新纳奇材料科技江苏有限公司
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