Hypochlorous Acid Surface Treatment for Heat-Free Rubber Bonding
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Solution Overview
Problem
Existing tire repair technologies face challenges in achieving firm adhesion between vulcanized rubber members without heating, which is necessary for on-site repairs, and often use organic solvents that deteriorate rubber.
Innovation Solution
Aqueous solution of hypochlorous acid with a pH of 2 to 7 and chlorine concentration of 100 to 13000 ppm is applied to vulcanized rubber surfaces, followed by an adhesive application, allowing firm adhesion without heating and minimizing rubber deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermocompression bonding is used to achieve adhesion between vulcanized rubber members, then firm adhesion is realized, but the operation becomes difficult when a tire is mounted
Solution Approach 1:
The invention changes the bonding mechanism from thermal (heat-based) to chemical (adhesive-based). By using a primer coating followed by an adhesive composition, the process eliminates the need for heating while achieving comparable or superior adhesion strength, making it suitable for mounted tire repairs where heating is impractical
Solution Approach 2:
The invention introduces a two-stage chemical treatment system consisting of a primer coating and an adhesive composition. The primer modifies the rubber surface to enhance bonding, while the adhesive provides the actual bonding mechanism. This intermediary chemical system replaces direct thermal bonding, enabling operation on mounted tires
2Ease of manufacture
If organic solvent is applied on the rubber surface to achieve adhesion, then bonding is facilitated, but the rubber deteriorates
Solution Approach 1:
The invention changes the chemical nature of the treatment from organic solvent-based to aqueous hypochlorous acid-based. This parameter change in the chemical composition eliminates the harmful effects of organic solvents on rubber while maintaining the surface modification needed for effective bonding
Solution Approach 2:
The invention uses hypochlorous acid, a strong oxidant, to modify the rubber surface. This oxidation process creates a surface that is more receptive to bonding without requiring harmful organic solvents. The controlled oxidation enhances surface energy and chemical reactivity, facilitating adhesive bonding while preserving rubber integrity
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 enables firm adhesion between vulcanized rubbers with excellent fatigue resistance, suitable for tire repairs, without the adverse effects of heating or organic solvents.
Implementation Method 1
an aqueous solution of hypochlorous acid having a pH value of 2 or more and 7 or less and an effective chlorine concentration of 100 ppm or more and 13000 ppm or less is applied on a surface of the first vulcanized rubber
Data Source
AI summary
Provided is a vulcanized rubber surface treatment agent that enables firm adhesion between vulcanized rubbers without heating and has little effect on rubber deterioration. The vulcanized rubber surface treatment agent is used for adhering vulcanized rubbers to each other, which is an aqueous solution of hypochlorous acid having a pH value of 2 or more and 7 or less and an effective chlorine concentration of 100 ppm or more and 13000 ppm or less.