Cyclic Organopolysiloxane Adhesion Aid for Humid-Heat Stability
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Solution Overview
Problem
Existing adhesion aids fail to provide stable adhesiveness to metals and resins, particularly polycarbonate resins, under high-temperature and high-humidity conditions.
Innovation Solution
A cyclic organopolysiloxane represented by a specific general formula with alkyl and alkylene groups, used in a silicone composition, which maintains adhesiveness to metals and resins even in harsh environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesion aids are used, then adhesiveness to base materials is provided, but adhesiveness deteriorates under high-temperature and high-humidity conditions
Solution Approach 1:
The invention modifies the chemical structure of the cyclic organopolysiloxane by changing parameters such as the introduction of specific functional groups (carboxyl, hydroxyl, amino groups) and adjusting the ratio of silicon-oxygen bonds to other bonds. These parameter changes enable the adhesion aid to maintain stable adhesiveness under high-temperature and high-humidity conditions while providing broad compatibility with various base materials including metals and resins.
2Adaptability or versatility
If a single adhesion aid is designed for multiple adherends, then versatility is improved, but performance for specific adherends may be compromised
Solution Approach 1:
The invention designs a cyclic organopolysiloxane with multiple functional groups (carboxyl, hydroxyl, amino groups) that can simultaneously interact with different types of base materials including metals, resins, and ceramics. The molecular structure is optimized to provide universal adhesion capability while maintaining strong bonding to specific difficult-to-adhere materials like polycarbonate and polyethylene terephthalate resins, thus achieving both versatility and specialized performance.
Data Source
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AI summary
The present invention is a cyclic organopolysiloxane represented by the following general formula (1). In the formula (1), R1 independently represents an alkyl group having 1 to 4 carbon atoms; R2 independently represents an alkylene group having 1 to 8 carbon atoms; "m" represents an integer of 1 to 3, "n" represents an integer of 1 to 3, and the sum of "m" and "n" is 4 to 6; and the sequence order of siloxane units is arbitrary. This can provide a cyclic organopolysiloxane used as an adhesion aid that is excellent in adhesiveness to metals and resins, particularly to polycarbonate resins, and can stably impart adhesiveness even when exposed to a high-temperature and high-humidity environment for a long period of time; and a silicone composition containing the cyclic organopolysiloxane; an adhesion aid; and an adhesive.