Electrostatic Spray Coating Adhesion and Durability
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Solution Overview
Problem
Conventional coating methods for skin using electrostatic spraying face issues such as poor adhesion, durability, and storage stability, particularly when containing non-volatile oils and polyols, leading to detachment and collapse of the fiber structure.
Innovation Solution
A coating formation method involving electrostatic spraying of a composition containing volatile substances, polymers with coating formability, and liquid agents like oils and polyols, which evaporate to form a transparent or translucent coating of fibers on the skin, enhancing adhesion and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrostatic spraying is used to form a coating on skin, then coating formation is achieved, but adhesion and durability are poor
Solution Approach 1:
The patent changes the chemical composition parameters of the sprayable composition by incorporating specific polymers (polyvinyl butyral, polyvinyl alcohol, or carboxymethyl cellulose) and liquid agents (oils or polyols) in defined proportions. This parameter modification enables the coating to achieve proper adhesion and durability while maintaining ease of application through electrostatic spraying.
Solution Approach 2:
The patent creates a composite coating system by combining multiple components: polymers (providing structural integrity), liquid agents (providing adhesion and flexibility), and volatile substances (enabling proper sprayability). This composite approach resolves the contradiction by integrating materials that work synergistically to achieve both good adhesion/durability and ease of manufacture.
2Reliability
If non-volatile oils and polyols are included in the composition, then coating adhesion is improved, but storage stability deteriorates due to fiber collapse
Solution Approach 1:
The patent carefully controls the concentration parameters of non-volatile components (polymers and liquid agents) within specific ranges (polymer: 1-50 mass%, liquid agent: 0.1-30 mass%). This parameter optimization ensures sufficient adhesion while preventing fiber collapse during storage, thereby maintaining storage stability.
Solution Approach 2:
The patent utilizes the volatile nature of certain components (water, alcohols, ketones) that evaporate during storage and application. This phase transition allows the coating to maintain fiber structure during storage while enabling proper coating formation and adhesion after application, resolving the contradiction between storage stability and adhesion.
3Illumination intensity
If the coating is made transparent or translucent, then cosmetic properties are improved, but adhesion strength may be reduced
Solution Approach 1:
The patent employs a composite formulation where transparent polymers (polyvinyl butyral, polyvinyl alcohol, or carboxymethyl cellulose) are combined with liquid agents (oils or polyols) in specific proportions. This composite structure enables the coating to maintain transparency while achieving sufficient adhesion strength through the synergistic interaction of components.
Solution Approach 2:
The patent optimizes the concentration parameters of polymer and liquid agent within specific ranges to achieve the desired balance between transparency and adhesion. By controlling these parameters, the coating maintains adequate light transmission while ensuring proper bonding to the skin surface.
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 achieves a stable, transparent, and durable coating on the skin that adheres well and remains intact even with friction, improving the cosmetic and functional properties of the coating.
Implementation Method 1
one or more volatile substances selected from water, alcohols, and ketones
Implementation Method 2
an electrostatic spraying step of electrostatically spraying a composition directly onto the coating formation target
Data Source
AI summary
The coating formation method of the present invention is a method for forming a coating on a surface of a coating formation target. The formation method of the present invention includes an electrostatic spraying step of electrostatically spraying a composition directly onto the coating formation target, thereby forming a coating composed of a deposit containing fibers. The composition contains a component (a), a component (b), and a component (c) below. (a) One or more volatile substances selected from water, alcohols, and ketones. (b) A polymer having coating formability. (c) A liquid agent containing one or more selected from oils and polyols that are in a liquid form at 20° C.