Composition for forming coating
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Solution Overview
Problem
Existing electrostatic spraying methods for forming coatings on target surfaces, especially under high-humidity conditions, face challenges such as fibers fluctuating, returning to the device, or scattering, due to moisture in the air, leading to poor adhesion and uneven coatings.
Innovation Solution
A composition comprising 1-45% polymer with film-forming ability, 45-95% volatile substances like alcohols or ketones, a conductivity controlling agent to maintain conductivity between 8-300 μS/cm, and 0.2-25% water, which stabilizes fiber deposition and enhances adhesivity even in high-humidity environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a composition containing water is used for electrostatic spraying under high-humidity conditions, then fiber deposition accuracy is improved, but fibers fluctuate and scatter leading to poor coating quality
Solution Approach 1:
The invention changes the electrical conductivity parameter of the composition to a specific range (10^-12 to 10^-6 S/cm) by carefully selecting and controlling water content (0.2-25 mass%) and adding conductivity controlling agents. This parameter optimization ensures stable electrostatic charging and fiber deposition even in high-humidity conditions, resolving the contradiction between deposition accuracy and coating stability.
Solution Approach 2:
The invention creates a composite composition system combining polymer (1-45 mass%), volatile substances (45-95 mass%), water (0.2-25 mass%), and conductivity controlling agents. This composite formulation synergistically balances the competing requirements: the polymer provides film-forming ability, volatile substances enable proper spray characteristics, controlled water content maintains conductivity, and conductivity controlling agents stabilize electrical properties, achieving both accurate deposition and reliable coating formation under high-humidity conditions.
2Strength
If water content is increased to improve adhesivity, then fiber adhesion to target surface is improved, but fibers return to the device or scatter
Solution Approach 1:
The invention optimizes the water content parameter within a specific range (0.2-25 mass%) and controls electrical conductivity to 10^-12 to 10^-6 S/cm through conductivity controlling agents. This parameter control ensures sufficient adhesivity while preventing excessive fiber scattering or return to the device, achieving balanced performance.
Solution Approach 2:
The invention applies local quality by differentiating the functional roles of different components: water (0.2-25 mass%) provides localized adhesion enhancement at the fiber-target interface, while conductivity controlling agents (at concentrations yielding 10^-12 to 10^-6 S/cm conductivity) locally stabilize electrical charge distribution. This localized functional differentiation allows adhesivity improvement without compromising deposition precision.
3Manufacturing precision
If conductivity is increased to improve fiber deposition control, then deposition accuracy is improved, but composition stability deteriorates
Solution Approach 1:
The invention changes the conductivity parameter to an optimized range (10^-12 to 10^-6 S/cm) rather than maximizing it. This moderate conductivity level provides sufficient electrostatic control for accurate fiber deposition while maintaining composition stability by preventing excessive ionic activity that would compromise formulation stability.
Solution Approach 2:
The invention introduces conductivity controlling agents as intermediary substances that mediate between the polymer matrix and the electrostatic charging process. These agents (including ionic liquids, surfactants, or inorganic salts at controlled concentrations) provide the necessary electrical conductivity for deposition control (10^-12 to 10^-6 S/cm) while their molecular structure and controlled dosage ensure they do not destabilize the overall composition.
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 ensures accurate fiber deposition and improved adhesivity on target surfaces, preventing fibers from returning to the device or scattering, while forming a soft and stable fibrous coating with enhanced adhesion.
Implementation Method 1
a composition for forming a coating of fibers on a target object by electrostatic spraying
Implementation Method 2
45 mass % to 95 mass % of one or more volatile substances selected from the group consisting of an alcohol and a ketone
Data Source
AI summary
Provided is a method for forming a good fibrous coating on a target surface even in a high-humidity environment when electrostatically spraying is performed directly on the target surface such as skin.A composition for forming a coating of fibers on a target object by electrostatic spraying, comprising the following components (a), (b), (c) and (d):(a) 1 mass % or more and 45 mass % or less of a polymer having a film-forming ability;(b) 45 mass % to 95 mass % of one or more volatile substances selected from the group consisting of an alcohol and a ketone;(c) a conductivity controlling agent to control the conductivity of the composition to 8 μS/cm or more and 300 μS/cm or less; and(d) 0.2 mass % or more and 25 mass % or less of water.