Polysiloxane polymer composition and the preparation method thereof
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Solution Overview
Problem
Existing polysiloxane polymer compositions contain high levels of D4, D5, and D6, exceeding the limits set by the European Chemicals Agency, posing environmental concerns and necessitating a reliable method to reduce these substances below 1000 ppm.
Innovation Solution
The synthesis of polysiloxane polymer is conducted in the presence of a strong acid with a pKa of no greater than 3.0, and optionally adjusted to an acidic pH after synthesis, using a combination of protonation compounds with varying pKa values to achieve low D4, D5, and D6 contents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polysiloxane polymer is prepared using conventional quaternization methods, then the polymer achieves desired functional properties, but high levels of D4, D5, and D6 are generated exceeding environmental limits
Solution Approach 1:
The patent changes the pH parameter of the reaction system by adding strong acid (pKa ≤ 3.0) to suppress the formation of D4, D5, and D6 cyclic siloxanes during quaternization. This parameter change maintains reaction efficiency while reducing harmful byproducts to below 1000 ppm
Solution Approach 2:
The patent converts the harmful effect of acid addition (which could potentially harm the polymer structure) into a benefit by carefully selecting strong acids with pKa ≤ 3.0 that effectively suppress cyclic siloxane formation while maintaining quaternization reaction efficiency and polymer functionality
2Object-generated harmful factors
If strong acid with pKa ≤ 3.0 is added during synthesis, then D4, D5, and D6 levels are reduced below 1000 ppm, but the process complexity increases
Solution Approach 1:
The patent applies preliminary action by adding the strong acid at specific stages during the quaternization process (either before or during the reaction) to prevent the formation of D4, D5, and D6 from the outset, rather than attempting to remove them after formation
Solution Approach 2:
The strong acid acts as an intermediary substance that mediates between the reacting components, suppressing the side reaction that forms cyclic siloxanes while allowing the main quaternization reaction to proceed efficiently
3Object-generated harmful factors
If strong acid is added after synthesis, then D4, D5, and D6 levels are reduced and storage stability is improved, but additional processing steps are required
Solution Approach 1:
The patent applies preliminary action by incorporating the strong acid addition step into the synthesis process itself, so that the suppression of D4, D5, and D6 formation occurs during the main reaction rather than requiring separate post-processing steps
Solution Approach 2:
The patent merges the acid addition step with the quaternization reaction step, combining two operations into one integrated process that achieves both polymer synthesis and harmful byproduct suppression simultaneously
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
The method results in polysiloxane polymer compositions with D4, D5, and D6 levels below 1000 ppm, meeting environmental regulations and enhancing the eco-friendliness of the product.
Implementation Method 1
reaction of hydrophobic component (a) comprising polysiloxane backbone and quaternization component (b) comprising tertiary amine group in the presence of protonation component (p)
Data Source
AI summary
The present invention relates to polysiloxane polymer compositions and methods for their preparation. The polysiloxane polymer compositions of the invention advantageously have low levels of small molecules of cyclic siloxane, such as octamethylcyclotetrasiloxane (D4).