Silicone Emulsion Composition for Balanced Release and Adhesion
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Solution Overview
Problem
Existing silicone emulsions face challenges in achieving suitable release force, high residual adhesion ratio, and good adhesiveness to paper or plastic film base materials, while also requiring expensive application apparatus and techniques, and are limited by high surface tension and poor wettability due to water as a dispersion medium.
Innovation Solution
An addition reaction-curable silicone emulsion composition comprising ureide compounds, alkenyl group-containing organopolysiloxane, and water, with specific ratios and components to enhance adhesiveness and curability, forming a cured film with suitable release properties and high residual adhesion to various base materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If emulsion-type silicone is used to reduce solvent usage, then environmental pollution is reduced, but curability deteriorates due to high latent heat of water evaporation
Solution Approach 1:
The invention changes the chemical composition parameters of the emulsion by incorporating specific organopolysiloxanes with controlled molecular weights and vinyl group contents, along with organometallic catalysts, to achieve both environmental friendliness and adequate curability at practical temperatures
Solution Approach 2:
The invention creates a composite emulsion system combining water, organopolysiloxane, emulsifier, and organometallic catalyst in specific proportions to achieve synergistic effects that simultaneously provide environmental benefits and acceptable curing performance
2Ease of manufacture
If emulsion-type silicone is used to reduce solvent usage, then solvent collection is simplified, but wettability deteriorates due to high surface tension of water
Solution Approach 1:
The invention introduces emulsifiers as intermediary substances that reduce the surface tension of water in the emulsion, enabling better wettability and adhesion to base materials while maintaining the water-based environmentally friendly formulation
Solution Approach 2:
The invention adjusts the surface tension parameters of the aqueous phase by selecting appropriate emulsifiers and controlling their concentrations, thereby achieving sufficient wettability without requiring organic solvents
3Strength
If adhesive strength is increased for plastic film base material, then adhesiveness is improved, but releasing force becomes too heavy for practical use
Solution Approach 1:
The invention optimizes the molecular weight distribution and functional group content of the organopolysiloxane to achieve an optimal balance between adhesion strength and release ease, preventing excessive bonding that would make delamination difficult
Solution Approach 2:
The invention uses controlled amounts of vinyl groups and catalysts to achieve sufficient but not excessive crosslinking density, providing adequate adhesion while maintaining ease of release when needed
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 excellent adhesiveness and release properties, suitable for paper or plastic film base materials, maintaining high residual adhesion and practicality, while avoiding the need for expensive application equipment.
Implementation Method 1
containing an organometallic catalyst, and water
Implementation Method 2
addition reaction-curable silicone emulsion composition comprising at least one ureide compound (I), organopolysiloxane (II) having at least two alkenyl groups per molecule
Data Source
AI summary
The present invention is an addition reaction-curable silicone emulsion composition containing at least one ureide compound (I) selected from non-polymeric organic compounds having at least one ureide group per molecule and organopolysiloxane (II) having at least two alkenyl groups per molecule, wherein the addition reaction-curable silicone emulsion composition contains 1.0 part by mass or more of the ureide compound (I) and 100.0 parts by mass or more of the water (VI) based on 100 parts by mass of the organopolysiloxane (II). This can provide: a silicone emulsion composition that provides a cured film having suitable release force and a high residual adhesion ratio against an adhesive, while having good coatability and good adhesiveness for paper or plastic film base material regardless of its type; and a release film wherein a cured film of the silicone emulsion composition is formed.