Release Agent Composition for Silicone Adhesive with Sea-Island Structure
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Solution Overview
Problem
Silicone pressure-sensitive adhesives (PSAs) face challenges in achieving a controlled release force, particularly when peeled from release liners, as existing solutions require different fluorine content levels to achieve varying release forces, and there is no effective method to increase release force beyond reducing fluorine content.
Innovation Solution
A release agent composition for silicone PSAs is developed, incorporating an organopolysiloxane with specific structural modifications, including alkenyl and fluoroalkyl groups, along with a platinum group metal catalyst and an organohydrogenpolysiloxane, which forms a sea-island structure upon curing, enhancing the release force without altering fluorine content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If fluorine content of the release agent is reduced to increase release force, then release force increases, but the release agent can no longer provide sufficient release force control for silicone PSAs
Solution Approach 1:
The invention changes the chemical composition parameters of the release agent by introducing a specific organopolysiloxane component (A) with controlled alkenyl and fluoroalkyl group contents. By adjusting the mole per 100g ratios of these functional groups, the invention achieves precise control over release force while maintaining high release force capability, resolving the contradiction between increasing release force and maintaining control capability.
Solution Approach 2:
The invention creates a composite release agent system combining multiple organopolysiloxane components with different functional groups (alkenyl, fluoroalkyl, and their combinations). This composite approach allows synergistic interaction between components, enabling both high release force and controllable release characteristics that cannot be achieved by simple fluorine content reduction alone.
2Ease of operation
If a release agent with high release force is used for silicone PSA, then peeling becomes smooth, but the PSA loses adhesion to the release liner
Solution Approach 1:
The invention applies local quality by creating a release agent composition with specific spatial distribution of functional groups. The organopolysiloxane (A) contains both alkenyl groups (for adhesion) and fluoroalkyl groups (for release) in controlled proportions, allowing different regions of the release agent layer to provide different functions: adhesion to substrate and controlled release of silicone PSA.
Solution Approach 2:
By precisely controlling the mole per 100g ratios of alkenyl groups (0.001 to 0.5) and fluoroalkyl groups (0.1 to 0.5) in the organopolysiloxane component, the invention adjusts the balance between adhesion and release properties. This parameter optimization enables smooth peeling while maintaining necessary adhesion during application.
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 solution allows for a significant increase in release force of the silicone PSA, enabling a double-side adhesive silicone sheet without substrates, with the release force being at least 1.5 times greater than before, and ensuring smooth peeling without deformation of the PSA layer.
Implementation Method 1
a platinum group metal base catalyst for promoting hydrosilylation between alkenyl groups in components (A) and (F) and Si—H groups in component (B) for curing
Data Source
AI summary
Provided is a release agent composition for silicone adhesives in which organopolysiloxane having a specific structure is added, as a heavy release component, to a release agent composition for silicone adhesives that includes organopolysiloxane modified with a fluorine-containing organic group.