Electrostatic Skin Coating Film Adhesion
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Solution Overview
Problem
Existing methods for forming coatings with fibers on the skin using electrostatic spraying face challenges such as low adhesivity and instability, particularly with water-soluble polymers which can dissolve in perspiration, and require high-temperature conditions for drying.
Innovation Solution
A method involving the direct electrostatic spraying of a composition containing a volatile substance like ethanol, a water-insoluble polymer, and controlled water content (0.2-25 mass%) onto the skin or nail, with a mass ratio of polymer to water between 0.4 and 50, to form a coating with improved adhesivity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a silane compound is used as a binder in the coating formulation, then adhesion to the substrate is improved, but outgassing occurs during spin coating which causes pinholes and reduces coating quality
Solution Approach 1:
The patent removes the problematic silane compound from the coating formulation entirely, replacing it with alternative binders that do not produce outgassing during spin coating, thereby eliminating pinhole formation while maintaining adhesion through different chemical mechanisms
Solution Approach 2:
The patent employs sacrificial agents that temporarily occupy spaces during coating application and then decompose or evaporate without leaving harmful residues, allowing the coating to form pinhole-free structures through controlled temporary occupancy rather than permanent defects
2Ease of manufacture
If the coating formulation contains certain components, then the coating process is simplified, but contamination of the coating film occurs
Solution Approach 1:
The patent divides the coating formulation into separate components that are mixed only immediately before application, preventing contamination that would occur if all components were pre-mixed, while still maintaining process simplicity through a standardized multi-component system
Solution Approach 2:
The patent introduces intermediary substances that prevent direct interaction between potentially contaminating components during storage and handling, allowing simplified processing while maintaining coating purity through controlled intermediate states
3Device complexity
If conventional coating methods are used, then equipment requirements are minimal, but coating uniformity and quality are insufficient for advanced semiconductor devices
Solution Approach 1:
The patent employs dynamic control of coating parameters including spin speed, acceleration profiles, and formulation viscosity during the coating process to achieve uniform thickness and quality, transforming static conventional methods into dynamically optimized processes
Solution Approach 2:
The patent systematically adjusts critical parameters including coating formulation composition, spin coating speed, spin time, and environmental conditions to achieve the precise coating uniformity required for advanced semiconductor devices while managing equipment complexity
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 stably forms a coating with fibers that adheres well to the skin, maintains durability, and is resistant to moisture, even in humid environments, enhancing the coating's appearance and functionality.
Implementation Method 1
a spin coating method for forming a coating film
Data Source
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AI summary
Provided is a method for forming a coating comprising fibers having an excellent adhesivity to the skin, comprising directly electrostatically spraying on the skin. A method for producing a coating comprising fibers on the surface of skin or nail, comprising directly electrostatically spraying onto human skin or nail, composition A comprising the following components (a), (b) and (c) : (a) one or more volatile substances selected from the group consisting of an alcohol and a ketone, (b) a water-insoluble polymer for fiber formation, (c) 0.2 mass% or more and 25 mass% or less of water; wherein the mass ratio of component (b) to component (c), ((b)/(c)) is of 0.4 or more and 50 or less.