Releasable Silicone Adhesive Composition for Non-Fluorine-Based Solvents
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Solution Overview
Problem
Existing releasable silicone compositions face challenges with non-fluorine-based solvents, exhibiting poor coatability, adhesiveness, high release force, and significant decreases in residual adhesion ratios, while fluorine-based solvents are expensive and environmentally harmful.
Innovation Solution
A releasable addition-curable silicone composition comprising fluorine-containing organopolysiloxane, organohydrogenpolysiloxane, a platinum group metal-based catalyst, and a non-fluorine-based solvent, with specific ratios and properties to enhance coatability, adhesiveness, and reduce release force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fluorine-based solvent is used to dilute fluorine-containing organopolysiloxane, then coatability and solubility are improved, but cost increases and environmental harm occurs
Solution Approach 1:
The patent replaces expensive fluorine-based solvents with cheaper non-fluorine-based solvents (such as hydrocarbon solvents, ketones, esters, or ethers) that achieve sufficient coatability without the environmental harms and high costs associated with fluorine-based solvents. This substitution maintains the functional requirements while eliminating the harmful aspects.
Solution Approach 2:
The patent modifies the chemical composition parameters of the silicone composition by adjusting the fluorine content (25-50 mass%) and molecular weight distribution (peak area of components with molecular weight of 4,000 or less is 2-20% of total peak area) to enable compatibility with non-fluorine-based solvents, thereby changing the solubility and coatability parameters without requiring fluorine-based solvents.
2Object-affected harmful factors
If a non-fluorine-based solvent is used to dilute fluorine-containing organopolysiloxane, then cost decreases and environmental harm is reduced, but coatability and adhesiveness deteriorate
Solution Approach 1:
The patent optimizes the fluorine content (25-50 mass%) and molecular weight distribution (peak area of components with molecular weight of 4,000 or less is 2-20% of total peak area) of the organopolysiloxane to achieve compatibility with non-fluorine-based solvents. These parameter changes enable sufficient coatability and adhesiveness while using environmentally friendly, cost-effective non-fluorine-based solvents.
Solution Approach 2:
The patent creates a composite silicone composition system combining fluorine-containing organopolysiloxane with specific organohydrogenpolysiloxane components and non-fluorine-based solvents. This composite approach achieves synergistic effects that improve coatability and adhesiveness while avoiding the use of fluorine-based solvents, thus resolving the contradiction between environmental friendliness and manufacturing performance.
3Object-affected harmful factors
If a non-fluorine-based solvent is used to dilute silicone composition, then cost decreases, but release force increases and residual adhesion ratio decreases
Solution Approach 1:
The patent precisely controls the fluorine content (25-50 mass%) and molecular weight distribution (peak area of components with molecular weight of 4,000 or less is 2-20% of total peak area) to optimize the balance between release force and residual adhesion ratio. These parameter optimizations ensure that the silicone composition maintains appropriate release characteristics when diluted with non-fluorine-based solvents, preventing excessive release force while controlling residual adhesion.
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 provides a cured film with high coatability, adhesiveness, and minimal residual adhesion loss, while avoiding environmental pollution from fluorine-based solvents.
Implementation Method 1
a platinum group metal-based catalyst: 0.5 to 5,000 ppm in terms of the mass of the platinum group metal relative to the component (A)
Implementation Method 2
an organohydrogenpolysiloxane having at least three hydrogen atoms (SiH groups) bonded to a silicon atom in one molecule: an amount at which a mole ratio of the hydrogen atoms (SiH groups) bonded to a silicon atom in the component (B) relative to the alkenyl groups in the component (A) is 0.1 to 15
Data Source
AI summary
A releasable addition-curable silicone composition for a silicone adhesive including: a fluorine-containing organopolysiloxane having at least two alkenyl groups bonded to a silicon atom and at least one fluorine-containing substituent bonded to a silicon atom in one molecule, wherein a fluorine content is 25 to 50 mass % and a peak area of components with a molecular weight of 4,000 or less is 2 to 20% of a total peak area based on molecular weight distribution measurement by gel permeation chromatography; an organohydrogenpolysiloxane having at least three hydrogen atoms (SiH groups) bonded to a silicon atom in one molecule; a platinum group metal-based catalyst; and a non-fluorine-based solvent.