Addition-Cure Silicone Adhesive for Microwave-Assisted Disassembly
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Solution Overview
Problem
Existing silicone-based adhesives used in high-temperature environments suffer from reduced adhesion and are difficult to disassemble, requiring significant energy consumption and time for separation.
Innovation Solution
An addition curable silicone composition comprising specific organosilicon compounds and microwave-activated particles that maintain adhesion at high temperatures and allow easy separation with minimal energy input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicone-base adhesive is used for bonding members, then heat resistant and weather resistant properties are improved, but disassembly difficulty increases and energy consumption for recovery increases
Solution Approach 1:
The invention changes the chemical bonding mechanism parameter from condensation cure to addition cure, and introduces microwave-absorbing particles to enable selective heating. This allows the adhesive to maintain heat resistance through addition curing while enabling easy disassembly through microwave-induced localized heating that weakens the bond without requiring high-temperature furnace processing.
Solution Approach 2:
The invention introduces microwave-absorbing particles as an intermediary substance within the adhesive composition. These particles act as a mediator that converts microwave energy into heat, enabling selective heating of the adhesive layer during disassembly. This intermediary allows the bond to remain strong under normal conditions while becoming easily separable under microwave irradiation.
2Ease of repair
If thermally disintegrable adhesive is used for high-temperature bonding, then adhesion at high temperature deteriorates, but disassembly ease improves
Solution Approach 1:
The invention changes the curing mechanism from thermal decomposition-based disassembly to microwave-heating-based disassembly. The addition cure system maintains adhesion stability at high temperatures, while the microwave-absorbing particles enable controlled heating specifically at the bond line during disassembly, avoiding the high-temperature exposure that would compromise adhesion strength.
Solution Approach 2:
The invention segments the heating function by introducing microwave-absorbing particles that concentrate thermal energy specifically at the adhesive layer during disassembly. This localized heating segmentes the thermal effect from the bulk material, allowing the adhesive to maintain its bonding properties during normal high-temperature service while becoming selectively removable under microwave irradiation.
3Ease of repair
If conventional heating method is used for disassembly, then disassembly effectiveness improves, but energy consumption increases and processing time increases
Solution Approach 1:
The invention substitutes the conventional thermal conduction heating method with direct microwave heating. Instead of using a furnace that heats the entire assembly through thermal conduction and convection, the microwave-absorbing particles directly absorb electromagnetic energy and convert it to heat at the bond line, dramatically reducing energy consumption and processing time.
Solution Approach 2:
The invention uses periodic microwave irradiation to heat the adhesive layer during disassembly. The microwave energy is applied in controlled pulses or continuous low-power irradiation, allowing the microwave-absorbing particles to progressively heat the adhesive to the detachment temperature without requiring the sustained high-temperature exposure needed in conventional furnace methods.
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 cures into a product that retains adhesion at 150°C while enabling easy disassembly with microwave irradiation, facilitating recycling of bonded components.
Implementation Method 1
particles capable of heat generation with microwave
Implementation Method 2
addition curable silicone composition comprising (A) 100 parts by weight of an organopolysiloxane having at least two silicon-bonded alkenyl groups per molecule, (B) 0.1 to 10 parts by weight of a linear organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms per molecule
Data Source
AI summary
This addition cure silicone compound comprises: 100 parts by mass of an organopolysiloxane (A) having at least two alkenyl groups bonded to a silicon atom in a molecule; 0.1 to 10 parts by mass of a linear organohydrogen polysiloxane (B) having at least two hydrogen atoms bonded to a silicon atom in a molecule; 0.1 to 10 parts by mass of an organosilicon compound (C) having an arylene skeleton and a hydrogen atom bonded to a silicon atom; and 1 to 100 parts by mass of a hydrosilylation reaction catalyst (D) and a particle (E) that generates heat as a result of microwave irradiation. The addition cure silicone composition does not undergo a decrease in adhesiveness nor adhere to a member even when exposed to a high-temperature environment of around 150°C, and provides a cured product that easily peels from the member in a short time with less energy consumption.