Multi-component Silicone Rubber Composition for Rapid Curing and Water Resistance
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Solution Overview
Problem
Multi-component room-temperature-curable silicone rubber compositions face challenges with slow curing speed and reduced adhesion durability when exposed to hot water, affecting their performance in applications like multiple-pane insulating glass units.
Innovation Solution
A multi-component room-temperature-curable silicone rubber composition comprising diorganopolysiloxanes capped with alkoxysilyl or hydroxysilyl groups, methoxy group-containing silicon compounds, and an organic tin catalyst, which are packaged separately to ensure rapid curing and maintain adhesion durability even under harsh conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional two-package type liquid room-temperature-curable silicone rubber composition is used, then adhesion durability against water is maintained, but curing speed is slow and production time is extended
Solution Approach 1:
The composition is divided into three separate packages: (A) base composition with diorganopolysiloxane, (B) crosslinking agent composition with methoxy group-containing silicon compound, and (C) catalyst composition. This segmentation allows each component to be optimized independently while maintaining stability during storage, and enables rapid curing when mixed without premature reaction.
Solution Approach 2:
The invention changes the chemical parameters by selecting specific compounds: diorganopolysiloxane with terminal silanol or alkoxysilyl groups, methoxy group-containing silicon compounds (bis(methoxysilyl)alkane or organotrimethoxysilane), and organic tin catalysts. These parameter selections enable both rapid curing speed and maintained adhesion durability against water.
2Manufacturing precision
If conventional silicone rubber composition is used, then deep curability is achieved, but adhesion durability deteriorates under severe conditions such as hot water immersion
Solution Approach 1:
The invention creates a composite system combining three essential components in specific proportions: base composition (A), crosslinking agent (B), and catalyst (C). This composite approach ensures both complete deep curability throughout the material and sustained adhesion durability even under severe hot water immersion conditions.
3Reliability
If multi-component room-temperature-curable silicone rubber composition with disilylalkane and carbasilatrane is used, then adhesion characteristics are improved, but curing speed becomes slow
Solution Approach 1:
The invention optimizes the molecular structure parameters by selecting diorganopolysiloxane with specific terminal groups (silanol or alkoxysilyl), methoxy group-containing silicon compounds as crosslinking agents, and organic tin catalysts. These parameter changes enable both rapid curing speed and improved adhesion characteristics without the slowness of conventional disilylalkane and carbasilatrane systems.
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 and maintains strong adhesion to various substrates, including glass and metals, with improved durability against water immersion, reducing production time and ensuring long-term performance.
Implementation Method 1
0.001 to 20 parts by weight of a curing catalyst
Implementation Method 2
a diorganopolysiloxane capped at molecular terminals with silanol groups; and a catalyst composition consisting of an alkyl silicate, an amino-functional silane, and a curing catalyst
Implementation Method 3
a diorganopolysiloxane capped at molecular terminals with silanol groups; 20 to 100 parts by weight of a diorganopolysiloxane (A-1) capped at both molecular terminals with alkoxysilyl groups or hydroxysilyl groups
Data Source
AI summary
A multi-component room-temperature-curable silicone rubber composition comprising at least: (A) a diorganopolysiloxane, (B) a methoxy group-containing silicon compound comprising a bis(methoxysilyl)alkane or a organotrimethoxysilane (except amino group containing organotrimethoxysilane) (B-1), a methoxy group-containing carbasilatrane derivative (B-2), and an aminoalkylmethoxysilane (B-3) (wherein the weight ratio of constituent (B-2) to constituent (B-3) is in the range of (20:80) to (80:20)); and (C) a curing catalyst,the composition being packaged as two or more separately stored compositions wherein none of said separately stored compositions contain all said components (A), (B), and (C) simultaneously.