Addition Reaction-Curable Silicone Adhesive for Rubber Bonding
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Solution Overview
Problem
Conventional silicone pressure-sensitive adhesives exhibit inadequate adhesive strength to silicone rubbers and require significant peeling force when removing the release film, failing to meet the demands for bonding heavier masses and withstanding greater impacts.
Innovation Solution
An addition reaction-curable silicone pressure-sensitive adhesive composition comprising a specific blend of diorganopolysiloxanes, organopolysiloxanes, organohydrogenpolysiloxanes, and a platinum group metal-based catalyst, which forms a cured product layer with excellent adhesion to silicone rubbers and minimal peeling force from a release film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional silicone pressure-sensitive adhesive compositions are used, then the adhesive exhibits good heat resistance and chemical resistance, but the adhesive strength to silicone rubbers is inadequate
Solution Approach 1:
The patent modifies the chemical composition parameters of the silicone pressure-sensitive adhesive by incorporating specific organosilicon compounds with B-O-Si bonds and controlling the ratio of alkenyl-containing to alkenyl-free diorganopolysiloxanes. This parameter change enables the adhesive to achieve superior bonding strength to silicone rubbers while maintaining its resistance properties under severe conditions.
Solution Approach 2:
The patent creates a composite adhesive system by combining multiple components: organosilicon compounds with B-O-Si bonds, diorganopolysiloxanes with and without alkenyl groups, and other silicone polymers. This composite approach allows the adhesive to simultaneously achieve strong bonding to silicone rubbers and maintain stability under extreme temperature and chemical conditions.
2Ease of operation
If conventional silicone pressure-sensitive adhesive compositions are used, then the adhesive provides basic bonding capability, but the peeling force required to remove the release film is excessive
Solution Approach 1:
The patent applies different functional characteristics to different aspects of the adhesive system. The specific organosilicon compounds with B-O-Si bonds provide strong local adhesion to silicone rubber adherends, while the overall composition formulation ensures that the release film can be easily removed. This local quality differentiation allows the adhesive to be strong where needed (bonding interface) but easy to remove (release film interface).
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 powerful adhesion to silicone rubbers while allowing easy peeling from a release film, enhancing the bonding capability and durability of silicone materials under various environmental conditions.
Implementation Method 1
addition reaction-curable silicone pressure-sensitive adhesive composition comprising a specific blend of diorganopolysiloxanes, organopolysiloxanes, organohydrogenpolysiloxanes, and a platinum group metal-based catalyst
Implementation Method 2
platinum group metal-based catalyst
Data Source
AI summary
Provided is an addition reaction-curable silicone pressure-sensitive adhesive composition, including: (A) a specific diorganopolysiloxane consisting of (A1) a linear diorganopolysiloxane having two or more alkenyl groups, and (A2) a linear diorganopolysiloxane having SiOH groups at the terminals and containing no alkenyl groups, (B) a specific organopolysiloxane containing M units, Q units and SiOH group-containing siloxane units, (C) an organohydrogenpolysiloxane containing three or more SiH groups, (D) an addition reaction retarder, (E) a platinum group metal-based catalyst, and (F) a specific organopolysiloxane containing T units and D units. A cured product layer formed from a cured product of this composition can be peeled from a release film with minimal peeling force, and exhibits excellent adhesion to silicone rubbers. The composition is ideal for use within a pressure-sensitive adhesive tape including a substrate and an aforementioned cured product layer laminated to at least one surface of the substrate.