Silicone Rubber Composition Adhesion Mold Release
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Solution Overview
Problem
Existing silicone rubber compositions either exhibit defective appearances or lack satisfactory adhesive properties with diverse organic resins and mold-release properties with metal dies during molding.
Innovation Solution
A silicone rubber composition comprising an organopolysiloxane with alkenyl groups, an organosiloxane with aryl and silicon-bonded hydrogen atoms, an acrylic or methacrylic compound, and a hydrosilylation catalyst, which forms a silicone rubber that adheres well to organic resins and releases from metal dies effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a silicone rubber composition contains an organosilicon compound with a siloxane skeleton incompatible with the heat curable organopolysiloxane composition, then mold-release properties with metal dies are improved, but adhesive properties with organic resins deteriorate and appearance becomes defective
Solution Approach 1:
The invention changes the chemical composition parameters by specifying exact component ratios: 100 parts organopolysiloxane with alkenyl groups, 0.1-5 parts organosiloxane with aryl groups and silicon-bonded hydrogen atoms, 0.1-5 parts acrylic or methacrylic compound, and organopolysiloxane with silicon-bonded hydrogen atoms in a mole ratio of 0.5-5 relative to aliphatic unsaturated bonds. This precise parameter control achieves both mold-release and adhesive properties simultaneously
Solution Approach 2:
The invention creates a composite silicone rubber system combining multiple components with complementary functions: organopolysiloxane with alkenyl groups for base properties, organosiloxane with aryl groups for adhesion enhancement, acrylic/methacrylic compounds for crosslinking, and silicon-bonded hydrogen compounds for mold-release. The synergistic combination resolves the contradiction between mold-release and adhesive properties
2Ease of operation
If the silicone rubber composition uses conventional formulations, then processing is simplified, but adhesive properties with diverse organic resins are insufficient
Solution Approach 1:
The invention modifies the chemical parameters by incorporating specific components in controlled amounts: 0.1-5 parts organosiloxane with aryl groups and silicon-bonded hydrogen atoms, and 0.1-5 parts acrylic or methacrylic compound. These parameter adjustments enhance adhesive properties while maintaining processing simplicity through straightforward mixing and curing procedures
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 excellent adhesive properties with diverse organic resins and superior mold-release properties with metal dies, resulting in a silicone rubber that adheres well to organic resins and maintains mechanical strength.
Implementation Method 1
the mole ratio of silicon-bonded hydrogen atoms per 1 mole of aliphatic unsaturated bonds in this composition is 0.5 to 5; (E) a catalytically effective amount of a hydrosilylation reaction catalyst
Data Source
AI summary
The silicone rubber composition of the present invention comprises: (A) an organopolysiloxane having at least two alkenyl groups in a molecule and free of an aryl group; (B) (B-1) an organosiloxane having in a molecule at least one aryl group, at least one silicon-bonded hydrogen atom, and free of an alkenyl group, or a mixture of components (B-1) and (B-2) an organosiloxane having in a molecule at least one aryl group and at least one alkenyl group; (C) an acrylic compound or a methacrylic compound; (D) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule and free of an aryl group and an alkenyl group; and (E) a hydrosilylation reaction catalyst. The silicone rubber composition exhibits excellent adhesive properties with respect to diverse organic resins it comes into contact with during its cure, and at the same time possesses excellent mold-release properties with respect to metal dies used for its molding.