Functionalized Silicone Particles via Hydrosilylation
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Solution Overview
Problem
Existing methods for hydrosilylation reactions are hindered by toxic effects of nitrogen, amines, quaternary ammonium, and sulfur compounds, which inhibit platinum catalysts, making it difficult to form silicones functionalized with various organic substituents.
Innovation Solution
A method involving an emulsion process with a hydrosilylation reaction and subsequent condensation reaction, using reactants with unsaturated carbon-carbon moieties and Si-H groups, along with a hydrosilylation catalyst and a polar liquid, to form cross-linked particles with organic functionality, overcoming catalyst poisoning issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If nitrogen compounds, amines, quaternary ammonium compounds, or sulfur compounds are used in hydrosilylation reactions, then organic functionality is introduced, but catalyst activity is inhibited or reaction speed is reduced
Solution Approach 1:
The patent employs a two-stage reaction process where a first reactant without toxic groups undergoes hydrosilylation first, then a second reactant containing nitrogen, amine, quaternary ammonium, or sulfur groups is introduced in a subsequent step. This intermediary approach allows the catalyst to perform its function in the first stage before being exposed to the toxic groups, thereby maintaining catalyst activity while still incorporating the desired organic functionality.
Solution Approach 2:
The reaction process is divided into separate stages: first forming particles through hydrosilylation of reactants without toxic groups, then adding reactants with toxic groups in a second stage. This segmentation prevents the toxic groups from being present during the catalyst-sensitive hydrosilylation step, resolving the contradiction between introducing functionality and maintaining catalyst activity.
2Ease of manufacture
If traditional step-wise processes are used for preparing silicone-containing polymer particles, then particles can be formed, but the process is time-consuming and complex
Solution Approach 1:
The patent combines multiple reaction steps into a single continuous process. The first and second reactants are added sequentially to the same reaction system without isolating intermediate products, merging what would traditionally be separate batch processes into one integrated operation. This reduces both the time required and the operational complexity while maintaining the ability to incorporate sensitive functional groups.
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
Enables the formation of silicone particles with organic functionality, enhancing the versatility and efficiency of hydrosilylation reactions by preventing catalyst inhibition and allowing for the incorporation of a wide range of organic moieties.
Implementation Method 1
The method includes the step of combining the first, second, and third reactants in the presence of the hydrosilylation catalyst to form an emulsion wherein the first, second, and third reactants react via a hydrosilylation reaction
Implementation Method 2
the condensable reactive group of the particles reacts with the condensation leaving group of the silane via a condensation reaction to form the particles having the organic functionality disposed thereon
Implementation Method 3
combining the first, second, and third reactants in the presence of the hydrosilylation catalyst and the polar liquid to form an emulsion wherein the first, second, and third reactants react
Data Source
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Figure 3A
AI summary
Particles are prepared in an emulsion using a method that includes providing a first reactant having at least two unsaturated carbon-carbon moieties and a second reactant having at least two Si-H moieties, so long as at least one of the unsaturated carbon-carbon moieties of the first reactant or the Si-H moieties of the second reactant is pendant. The method also includes providing a third reactant having a silicon atom and a condensable reactive group bonded to the silicon atom and also having an unsaturated carbon-carbon moiety and/or a Si-H moiety, providing a hydrosilylation catalyst, and providing a polar liquid. The method further includes combining the first, second, and third reactants to form particles that have a cross- linked network wherein the condensable reactive group is disposed on the particles, and adding a silane having an organic moiety and a condensation leaving group to form the particles.