SiOC-Bonded Polyether Siloxanes via Trifluoromethanesulfonate Catalysis
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Solution Overview
Problem
The existing processes for producing SiOC-bonded polyether siloxanes through transesterification of alkoxysiloxanes with polyetherols face challenges such as the formation of unwanted by-products like hexamethylcyclotrisiloxane, which causes maintenance issues, and the need for handling hazardous acids or bases, leading to safety concerns and product quality issues.
Innovation Solution
The use of trifluoromethanesulfonate salts as catalysts in the transesterification process, with controlled water content and specific reaction conditions, minimizes the formation of hexamethylcyclotrisiloxane and avoids the use of acids or bases, ensuring safer handling and higher product quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional transesterification catalysts (acids or bases) are used, then the reaction proceeds, but hazardous substances are formed and safety concerns arise
Solution Approach 1:
The patent changes the chemical parameter of the catalyst from traditional acids or bases to trifluoromethanesulfonate salts, which have different chemical properties that eliminate hazardous by-products while maintaining catalytic activity for the transesterification reaction
Solution Approach 2:
The patent introduces trifluoromethanesulfonate salts as an intermediary substance that mediates the transesterification reaction between alkoxysiloxanes and polyetherols, enabling the reaction to proceed without requiring hazardous acids or bases
2Productivity
If conventional catalysts are used, then transesterification occurs, but unwanted by-products like hexamethylcyclotrisiloxane are formed
Solution Approach 1:
The patent changes the catalyst parameter from conventional acids/bases to trifluoromethanesulfonate salts, which fundamentally alters the reaction pathway to eliminate cyclic siloxane by-products while maintaining high conversion to the desired polyether siloxane product
Solution Approach 2:
The patent converts the potentially harmful effect of catalyst-induced side reactions into a benefit by using trifluoromethanesulfonate salts that selectively promote the desired transesterification reaction while suppressing by-product formation, turning what would normally be a source of contamination into a source of high-purity product
3Power
If acid or base catalysts are used, then the reaction is catalyzed, but safety and handling become problematic
Solution Approach 1:
The patent uses trifluoromethanesulfonate salts as an intermediary catalyst that provides the necessary catalytic activity for the transesterification reaction while being safer to handle than traditional acids or bases, eliminating the need for special safety protocols
Solution Approach 2:
The patent changes the catalyst's chemical parameters to use trifluoromethanesulfonate salts, which maintain effective catalytic activity for transesterification while having safer handling properties and eliminating hazardous by-products
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for quantitative conversion of alkoxy groups to polyetherols without side reactions, providing high-resolution SiOC-bonded polyether siloxanes suitable for demanding applications like paint additives, with improved stability and reduced maintenance costs.
Implementation Method 1
The use of trifluoromethanesulfonate salts as catalysts in the transesterification process, with controlled water content and specific reaction conditions, minimizes the formation of hexamethylcyclotrisiloxane and avoids the use of acids or bases
Implementation Method 2
a process for producing SiOC-bonded polyether siloxanes by transesterification of alkoxysiloxanes with polyetherols
Data Source
AI summary
SiOC-bonded polyether siloxanes are produced by transesterification of alkoxysiloxanes with polyetherols in the presence of trifluoromethanesulfonate as catalyst. The computational total water content of the reactants including alkoxysiloxanes and polyetherols is ≤5000 ppm by mass, advantageously ≤300 ppm by mass, preferably ≤150 ppm by mass, more preferably ≤100 ppm by mass, in particular ≤50 ppm by mass. The determination of the individual water contents is performed beforehand, preferably by titration according to Karl Fischer.