Resin Surface Hydrophilization via High-Concentration Ozone
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Solution Overview
Problem
Current surface modification methods for films, such as corona discharge and plasma treatment, face challenges in achieving fine control over uniformity and long-term modification effects, with physical methods like ultraviolet light irradiation and reactive gases like ozone showing limitations in supplying reactive species and maintaining hydrophilicity over time.
Innovation Solution
A method involving the use of high-concentration ozone gas (50 vol % or greater) and unsaturated hydrocarbon gas, such as ethylene, is supplied to the resin surface, with controlled flow and temperature to enhance surface hydrophilicity, using a device with a treatment furnace, ozone supply, and unsaturated hydrocarbon supply, ensuring uniform treatment and minimizing surface roughening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical modification methods such as corona discharge or plasma treatment are used, then the modification effect is high, but the uniformity of the modification effect becomes difficult to control and the temperature of the film may become high causing damage
Solution Approach 1:
The patent replaces physical modification methods (corona discharge, plasma treatment) with a chemical modification method using liquid ozone water. This substitution eliminates the need for electrical discharge and associated temperature control issues, while providing more uniform modification through liquid-phase chemical reactions on the film surface.
Solution Approach 2:
The patent changes the state of the modifying agent from gaseous (ozone gas) to liquid (ozone water), and controls parameters such as ozone concentration (5-50 mass%) and treatment temperature to achieve uniform modification without excessive heat generation, resolving the contradiction between modification effectiveness and uniformity control.
2Ease of manufacture
If ultraviolet light irradiation or electron beam irradiation is used, then the modification process is simple, but these methods are not suitable for films that transmit ultraviolet light or electron beams easily
Solution Approach 1:
The patent substitutes radiation-based modification (ultraviolet light or electron beam) with chemical modification using liquid ozone water. This approach maintains process simplicity while ensuring effective surface modification regardless of the film's transparency to radiation, as the liquid ozone water directly contacts and reacts with the film surface.
3Quantity of substance
If ozone gas is used for surface modification, then reactive oxygen species can be supplied, but sufficient oxygen radicals cannot be supplied to the film surface and control becomes difficult
Solution Approach 1:
The patent changes ozone from gaseous state to liquid state (ozone water) with controlled ozone concentration (5-50 mass%). This phase change allows the ozone to remain on the film surface longer, providing sufficient oxygen radicals for modification while enabling precise control through concentration and temperature parameters, thus resolving the contradiction between supply amount and controllability.
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
This approach significantly improves the wettability of the resin surface, maintaining hydrophilicity for an extended period while avoiding surface roughening and temperature-induced deformation, outperforming traditional methods in terms of modification effectiveness and durability.
Implementation Method 1
ozone gas and an unsaturated hydrocarbon gas are supplied to the resin for hydrophilizing the surface of the resin
Implementation Method 2
the compulsive decomposition of the ozone gas is therefore performed by irradiating ultraviolet light to the ozone gas, to increase the supply amount of the oxygen radicals
Data Source
AI summary
It is a method for modifying a resin (6), the method for hydrophilizing the surface of the resin (6). High-concentration ozone gas and an unsaturated hydrocarbon gas are supplied to the surface of the resin (6), and the surface of the resin (6) is hydrophilized. The high-concentration ozone gas is generated by re-vaporizing liquid ozone obtained by liquefaction and fractional distillation of an ozone-containing gas. Ozone gas having an ozone concentration of 50 vol % or greater is used as the high-concentration ozone gas. A gas containing an unsaturated hydrocarbon with a carbon number of 10 or lower which has a double bond or a triple bond is used as the unsaturated hydrocarbon gas.