Curable Silicone Composition for Low-Temperature Transparent Curing
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Solution Overview
Problem
Current curable silicone compositions require high-temperature, long-time curing, leading to reduced productivity and potential damage to electronic devices, along with significant volume shrinkage and coloration issues, which are not suitable for applications requiring transparency and low viscosity.
Innovation Solution
A curable silicone composition with a specified ratio of straight-chain organopolysiloxane, organopolysiloxane resin, organohydrogenpolysiloxane resin, and straight-chain organohydrogenpolysiloxane, using a low amount of hydrosilylation catalyst, to enable curing at low temperature and short time with minimal shrinkage and color change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature, long-time curing is used for curable silicone composition, then complete curing and crosslinking are achieved, but productivity decreases and electronic devices may be damaged
Solution Approach 1:
The patent changes the chemical parameters of the silicone composition by incorporating specific functional groups (vinyl, allyl, propargyl) and using a platinum catalyst to enable curing at lower temperatures (50-150°C) and shorter times (1-30 minutes), resolving the contradiction between curing completeness and productivity
Solution Approach 2:
The patent introduces a platinum catalyst as an intermediary substance that facilitates the hydrosilylation reaction between silane and vinyl/allyl/propargyl groups, enabling complete curing under milder conditions without requiring high temperature and long time, thus improving productivity while maintaining reliability
2Reliability
If conventional curable silicone composition is used, then curing is achieved, but significant volume shrinkage occurs during hardening
Solution Approach 1:
The patent changes the molecular structure parameters by using linear-chain organopolysiloxane with specific functional groups and controlling the ratio of crosslinking agents, achieving curing with minimal volume shrinkage (less than 2%) while maintaining curing capability
Solution Approach 2:
The patent creates a composite curing system combining silane-modified polysiloxane with vinyl/allyl/propargyl groups and crosslinking agents containing corresponding functional groups, where the synergistic interaction between components achieves complete curing with minimal shrinkage
3Reliability
If conventional curable silicone composition is used, then curing is achieved, but coloration occurs and transparency is lost
Solution Approach 1:
The patent changes the chemical composition parameters by selecting specific functional groups (vinyl, allyl, propargyl) and using a platinum catalyst instead of conventional catalysts, achieving complete curing while maintaining excellent transparency and preventing coloration of the hardened material
4Productivity
If high catalyst quantity is used to reduce curing time, then curing speed increases, but marked coloration of hardened material occurs
Solution Approach 1:
The patent changes the catalyst type parameter from conventional catalysts to platinum catalyst, which enables fast curing (1-30 minutes) at low temperatures with minimal coloration, achieving both high productivity and maintained transparency simultaneously
Solution Approach 2:
The platinum catalyst acts as an efficient intermediary that promotes rapid hydrosilylation reaction without causing significant coloration, resolving the contradiction between curing speed and transparency that plagues conventional systems requiring large catalyst quantities
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 allows for rapid curing at low temperatures with low viscosity, minimal shrinkage, and maintains transparency, enhancing productivity and suitability for semiconductor sealing applications.
Implementation Method 1
curable silicone composition which includes: (A) straight-chain organopolysiloxane which has at least two alkenyl groups bound to a silicon atom... (C) organohydrogenpolysiloxane resin which has a network molecular structure with at least two hydrogen atoms bound to a silicon atom per molecule... and a hydrosilylation reaction catalyst
Data Source
AI summary
A curable silicone composition of the present invention contains certain quantities of straight-chain organopolysiloxane which has at least two alkenyl groups and bound to silicon atoms and ≥0 mol % and <5 mol % of aryl groups per molecule, organopolysiloxane resin having at least two alkenyl groups bound to a silicon atom in the molecule, organohydrogenpolysiloxane resin which has a network molecular structure with at least two hydrogen atoms bound to a silicon atom per molecule, organohydrogenpolysiloxane resin which has a network molecular structure with at least two hydrogen atoms bound to a silicon atom per molecule, only at the end of the molecule, and hydrosilylation reaction catalyst, and (total mols of silicon-atoms-bound) hydrogen atoms/(total mols of silicon-atom-bound alkenyl groups) in the organopolysiloxane in the composition=1-3.