Curable Silicone Composition for Stable Low-Odor Adhesion
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Solution Overview
Problem
Existing curable silicone compositions using oximosilane crosslinkers suffer from poor storage stability and adhesion to certain substrates, and release compounds with unpleasant odors and potential health risks.
Innovation Solution
A curable composition comprising polyorganosiloxanes endcapped with specific silane groups, combined with an adhesion promoter, curing catalyst, and an additive with a ketone functional moiety, ensuring high storage stability and reliable adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oximosilane crosslinkers are used in curable silicone compositions, then crosslinking can proceed effectively, but the released oximes have unpleasant odors and potential health risks
Solution Approach 1:
The patent extracts and removes the problematic oxime functional group from the crosslinking system. Instead of using oximosilane crosslinkers that release oximes, the invention employs alternative crosslinking mechanisms that achieve effective crosslinking without generating harmful volatile compounds, thereby eliminating the odor and health issues while maintaining crosslinking effectiveness
Solution Approach 2:
The patent converts the crosslinking function previously achieved by oximosilane into a beneficial process that eliminates harmful emissions. The alternative crosslinking system maintains the essential crosslinking effectiveness while transforming the harmful oxime release into a benign process, turning a harmful crosslinking method into a safe one
2Reliability
If conventional curable silicone compositions are formulated, then they can achieve crosslinking, but they exhibit poor storage stability
Solution Approach 1:
The patent applies preliminary action by formulating the curable silicone composition with specific stabilizers and controlled ingredient combinations before storage. The composition is pre-configured with components that prevent premature crosslinking and maintain stability during storage, while still enabling effective crosslinking when applied, thus resolving the contradiction between storage stability and crosslinking capability
Solution Approach 2:
The patent employs parameter changes by adjusting the chemical composition parameters, including the selection of specific crosslinking agents, catalysts, and stabilizers in controlled proportions. These parameter adjustments optimize both storage stability and crosslinking effectiveness, allowing the composition to remain stable during storage while maintaining reliable crosslinking performance
3Reliability
If conventional curable silicone compositions are formulated, then they can achieve crosslinking, but they exhibit poor adhesion to certain substrates
Solution Approach 1:
The patent applies composite materials by incorporating adhesion promoters and surface-active agents into the curable silicone composition. These additional components work synergistically with the crosslinking system to enhance adhesion to challenging substrates while maintaining effective crosslinking, thereby resolving the contradiction between crosslinking capability and adhesion strength
Solution Approach 2:
The patent introduces intermediary substances such as adhesion promoters that mediate between the silicone composition and the substrate surface. These intermediaries improve the bonding interface and adhesion strength without interfering with the crosslinking reaction, thus resolving the contradiction between crosslinking effectiveness and adhesion performance
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 composition achieves excellent storage stability and adhesion properties without the release of unpleasant odors or harmful compounds, curing reliably at room temperature.
Implementation Method 1
In the presence of atmospheric moisture these alkoxysilane-terminated polymers are able to condense with elimination of the alkoxy groups
Implementation Method 2
This can be carried out optionally in the presence of a catalyst, whereby the catalyst is to mediate the endcapping selectively without simultaneously curing the polyorganosiloxane
Implementation Method 3
Typical representatives of neutral crosslinkers have hydrolyzable groups, which release alcohols or oximes during the crosslinking
Data Source
AI summary
The invention relates to curable compositions based on polyorganosiloxanes with special silicon-containing terminal groups, an adhesion promoter, a curing catalyst, and an additive having a ketone functional moiety. These compositions have improved mechanical and adhesion properties and excellent storage stability. The invention also relates to the uses thereof.