Method for preparing perfluoropolyether with high molecular weight
A technology of perfluoropolyether and high molecular weight, which is applied in the field of new functional materials containing fluorine, and can solve rare and other problems
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Embodiment 1
[0026] Add 10.0g of tetramethylammonium fluoride, 10.0g of rubidium fluoride and 500ml of dry tetrahydrofuran into a 10L reaction kettle, adjust the reaction temperature to 25°C, and stir for 24h; After stabilization, add hexafluoropropylene oxide into the polymerization kettle at a rate of 20g / min, and after adding 6000g, stop adding hexafluoropropylene oxide, and then stir for 12h; then raise the temperature of the reactor to 25°C, stir for 2h, The reaction is over. After tetramethylammonium fluoride, rubidium fluoride and tetrahydrofuran were recovered, the reaction product was post-treated to finally obtain the target product 5865g with a yield of 97.7% and a conversion rate greater than 95%. The average molecular weight of the product through infrared and nuclear magnetic analysis is 5292.
Embodiment 2
[0028] Add 10.0g of tetraethylammonium fluoride, 2.0g of lithium fluoride and 800ml of dry propionitrile into a 10L reaction kettle, adjust the reaction temperature to 35°C, and stir for 24h; then adjust the temperature of the reaction kettle to -60°C, and wait After the temperature stabilized, add hexafluoropropylene oxide into the polymerization kettle at a rate of 15g / min. After adding 6800g, stop the addition of hexafluoropropylene oxide and stir for another 12h; then raise the temperature of the reactor to 20°C and stir for 2h , the reaction ends. After recovering tetraethylammonium fluoride, lithium fluoride and propionitrile, the reaction product was post-treated to finally obtain 6560 g of the target product with a yield of 96.5% and a conversion rate greater than 95%. The average molecular weight of the product through infrared and nuclear magnetic analysis is 5956.
Embodiment 3
[0030] Add 10.0g of tetramethylammonium fluoride, 10.0g of sodium fluoride and 800ml of dry dioxane into a 10L reaction kettle, adjust the reaction temperature to 20°C, stir for 24h; then adjust the temperature of the reaction kettle to -60°C , after the temperature is stabilized, add hexafluoropropylene oxide into the polymerization kettle at a rate of 15g / min, after adding 3400g, stop the addition of hexafluoropropylene oxide, and then stir for 12h; then raise the temperature of the reactor to 40°C, Stirring for 2h, the reaction ended. After recovering tetramethylammonium fluoride, sodium fluoride and dioxane, the reaction product was post-treated to finally obtain 3280 g of the target product with a yield of 96.5% and a conversion rate greater than 95%. The average molecular weight of the product through infrared and nuclear magnetic analysis is 5130.
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
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