Two-Component Silicone Adhesive for High-Temperature Bonding
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Solution Overview
Problem
Existing silicone-based adhesive compositions suffer from poor adhesion and embrittlement at high temperatures, generating harmful by-products and bubbles, making them unsuitable for applications exceeding 200°C.
Innovation Solution
A two-component silicone-based adhesive composition comprising a vinyl-terminated polysiloxane polymer, a hydrosilyl group-containing crosslinker, a -Si(OR3) terminated polyorganosiloxane prepolymer, a hydrosilylation catalyst, and a combination of epoxy silane and titanium alkoxide, which promotes stable adhesion and mechanical properties at temperatures up to 300°C without generating by-products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional silicone-based adhesive compositions are used, then the adhesive provides basic sealing functionality, but the adhesion strength deteriorates at high temperatures above 200°C
Solution Approach 1:
The patent modifies the chemical composition parameters of the silicone adhesive by incorporating specific additives and crosslinking agents that enable the material to maintain adhesion strength at temperatures up to 300°C, representing a significant parameter change from conventional formulations
Solution Approach 2:
The invention creates a composite adhesive system combining silicone base polymer with reinforcing agents and functional additives, forming a multi-component composite material that achieves both high-temperature resistance and strong adhesion properties
2Reliability
If polycondensation technology is used to create 2-component silicones, then the adhesive provides basic curing functionality, but by-products are generated that cause bubbles and embrittlement at high temperatures
Solution Approach 1:
The patent extracts and eliminates the by-product generation mechanism from the curing process by using an alternative chemistry that does not produce volatile by-products, thereby preventing bubble formation and embrittlement
Solution Approach 2:
The invention converts the potential harm of high-temperature exposure into a benefit by using a curing system that actually improves at elevated temperatures, maintaining flexibility and adhesion where conventional systems fail
3Strength
If typical fillers such as calcium carbonate and trihydrate alumina are added to 2-component silicones, then the adhesive provides structural support, but the product becomes embrittled upon exposure to temperatures over 200°C
Solution Approach 1:
The patent changes the filler composition parameters by selecting specific inorganic fillers with high thermal stability that do not cause embrittlement, replacing conventional fillers that degrade at elevated temperatures
Solution Approach 2:
The invention creates a composite formulation combining the silicone matrix with thermally stable filler materials that maintain their properties at high temperatures, providing both structural support and thermal stability
4Ease of operation
If 1-component acetoxy silicone is used, then the adhesive provides single-component simplicity, but corrosion occurs on metal substrates and handling time increases
Solution Approach 1:
The patent removes the corrosive by-product generation mechanism from the adhesive chemistry, eliminating the harmful effect on metal substrates while maintaining ease of application
Solution Approach 2:
The invention changes the chemical reactivity parameters of the adhesive system to reduce corrosion potential while maintaining curing functionality, using a chemistry that is gentler on metal substrates
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 strong, durable bonding with improved thermal and chemical stability, low shrinkage, and no by-products, maintaining adhesion on metal and plastic surfaces at temperatures between 200°C and 300°C.
Implementation Method 1
a two-component silicone-based adhesive composition comprising a vinyl-terminated polysiloxane polymer, a hydrosilyl group-containing crosslinker
Implementation Method 2
a combination of epoxy silane and titanium alkoxide, which promotes stable adhesion and mechanical properties at temperatures up to 300°C
Data Source
AI summary
The present invention relates to two-component (2K) silicone-based adhesive compositions comprising at least one epoxy silane and a titanium alkoxide adhesion promoter, as described herein, for improving high temperature resistance while maintaining adhesive properties of silicone-based adhesive compositions..