Silicone PSA Laminate Bonding for Weak Silicone-Rubber Adhesion
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Solution Overview
Problem
Current silicone pressure sensitive adhesives exhibit weak adhesion to silicone rubber substrates, failing to meet application needs in electronics and automotive industries.
Innovation Solution
A method involving the condensation reaction of bis-hydroxyl-terminated polydiorganosiloxane and hydroxyl-functional polyorganosilicate resin, with specific ratios and catalysts, followed by addition of an additional polyorganosilicate resin and optional peroxide crosslinking, to form a silicone pressure sensitive adhesive with improved adhesion to silicone rubber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If current commercially available silicone pressure sensitive adhesives are used, then the adhesive can be applied to silicone rubber substrates, but the adhesion strength is relatively weak and fails to meet application needs
Solution Approach 1:
The patent changes the chemical composition parameters of the silicone pressure sensitive adhesive by incorporating specific ratios of polydiorganosiloxane (10-40 parts), polyorganosilicate resin (60-85 parts), and silane-modified polyorganosiloxane (5-20 parts). These parameter changes in material composition directly improve the adhesion strength to silicone rubber substrates while maintaining application reliability in electronics and automotive industries.
Solution Approach 2:
The patent creates a composite silicone pressure sensitive adhesive system by combining multiple silicone-based polymers with different functional properties. The composite formulation integrates polydiorganosiloxane for flexibility, polyorganosilicate resin for adhesion, and silane-modified polyorganosiloxane for crosslinking capability, achieving both high adhesion strength and reliability for bonding to silicone rubber.
2Strength
If the adhesive formulation is modified to improve adhesion strength, then bonding performance to silicone rubber improves, but the complexity of the manufacturing process increases
Solution Approach 1:
The patent merges multiple adhesive functions into a single integrated formulation by combining polydiorganosiloxane, polyorganosilicate resin, and silane-modified polyorganosiloxane in specific ratios. This merging approach achieves improved adhesion strength through chemical synergies while simplifying the manufacturing process by eliminating the need for separate application and crosslinking steps required by multi-component 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 method produces a silicone pressure sensitive adhesive with adhesion strength greater than 1,000 gf/in, suitable for bonding to silicone rubbers, enhancing performance in electronics and automotive applications.
Implementation Method 1
combining, under conditions to effect condensation reaction, starting materials comprising (P) a bis-hydroxyl-terminated polydiorganosiloxane and (R) a hydroxyl-functional polyorganosilicate resin
Implementation Method 2
adding (C) a condensation reaction catalyst to the reaction mixture
Implementation Method 3
mixing the catalyzed reaction mixture at a temperature of 20°C. to 150°C. and removing water
Implementation Method 4
curing the silicone pressure sensitive adhesive composition to form a silicone pressure sensitive adhesive layer
Data Source
AI summary
A laminate article includes a silicone pressure sensitive adhesive adhered to a silicone rubber article. A method for fabricating the laminate article is provided.