Curable Silicone Composition for Low-Temperature Rapid Curing
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Solution Overview
Problem
Existing curable silicone compositions face challenges in achieving rapid curing at low temperatures (up to 60°C or lower) while maintaining storage stability and reaction control, and they often result in a cured product with surface tack.
Innovation Solution
A curable silicone composition comprising specific organopolysiloxanes with carbon-carbon double bonds, organohydrogenpolysiloxanes, and a hydrosilylation reaction catalyst, activated by heating or high-energy beam irradiation, allowing for rapid curing at low temperatures and providing a hard, low-tack cured product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a photoactive hydrosilylation reaction catalyst and ultraviolet light irradiation are used to enable room temperature curing, then curing can proceed at room temperature, but curing takes a long time
Solution Approach 1:
The patent changes the key parameter of catalyst type from photoactive to heat-activatable, and adjusts the activation method from UV irradiation to thermal activation. This parameter change enables the curing reaction to proceed rapidly at low temperatures (100°C or lower) without the time penalty associated with photoactive catalysts, thus resolving the contradiction between low curing temperature and short curing time
2Productivity
If a curable silicone composition is designed to cure rapidly at room temperature, then low-temperature curability is achieved, but storage stability and reaction control deteriorate
Solution Approach 1:
The patent introduces a dynamic control mechanism where the curing reaction is activated only when heat is applied. The heat-activatable catalyst remains dormant during storage, ensuring stability, but becomes active upon heating to enable rapid curing. This dynamic switching between dormant and active states resolves the contradiction between rapid curing speed and storage stability
Solution Approach 2:
The composition is prepared in advance with all necessary components (silane-modified polysiloxane, crosslinking agent, and heat-activatable catalyst) but the curing reaction is postponed until heat activation. This preliminary preparation with delayed reaction onset allows the composition to maintain storage stability while being ready for rapid curing when needed, resolving the contradiction between curing speed and storage stability
3Reliability
If conventional curable silicone compositions are used, then storage stability is maintained, but the cured product exhibits surface tack and reduced hardness
Solution Approach 1:
The patent creates a composite curing system combining silane-modified polysiloxane with specific crosslinking agents and heat-activatable catalysts. This composite material approach enables the cured product to achieve both high hardness and low surface tack while maintaining storage stability, resolving the contradiction between storage stability and cured product quality
Solution Approach 2:
The patent modifies the chemical composition parameters by using silane-modified polysiloxane with specific crosslinking agents and heat-activatable catalysts. These parameter changes result in a cured product with improved hardness and reduced surface tack compared to conventional compositions, while maintaining storage stability through the heat-activation mechanism
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 rapid curing at low temperatures with excellent storage stability and reaction control, resulting in a hard, low-tack cured product suitable for semiconductor devices and other applications.
Implementation Method 1
The hydrosilylation reaction is often used as the reaction for curing the curable silicone composition because of its high reaction efficiency
Implementation Method 2
activated by heating or high-energy beam irradiation, allowing for rapid curing at low temperatures
Implementation Method 3
activated by heating or high-energy beam irradiation
Data Source
Figure 1
AI summary
ABSTRACT: [Problem] To provide a curable silicone composition that forms a cured product that can be rapidly cured at a low temperature, has excellent storage stability, is relatively hard from curing, and has low surface tack, and the cured product thereof and the usage. [Solution] A curable silicone composition comprising: (A) an organopolysiloxane having a curing reactive functional group at a molecular terminal and the content thereof in a range of 0.001 to 10 mass%; (B) an organohydrogenpolysiloxane; (C) a hydrosilylation reaction catalyst; (D) a branched organopolysiloxane having a curing reactive functional group in an amount exceeding 10 mass% in a molecule at a molecular terminal and containing 10 mol% or more of a branched siloxane unit, wherein the content of component (D) is in the range of 0.1 to 5 mass% relative to the total amount of components (A) to (D).