Tire Inner Liner Surface Treatment for Post-Cure Adhesion
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Solution Overview
Problem
The polysiloxane-containing release treatments applied to the inner liner of tires to prevent sticking during the curing process remain on the surface after curing, inhibiting the adhesion of other materials, such as adhesives and sealants.
Innovation Solution
Treating the lower surface of the cured inner liner to convert polysiloxane moieties to silanol moieties, either by irradiation or oxidation, increasing the hydrophilicity and adherability of the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polysiloxane-containing release treatment is applied to the inner liner surface, then sticking prevention during curing is improved, but adhesion of adhesives and sealants after curing deteriorates
Solution Approach 1:
The invention changes the chemical state of the polysiloxane surface by converting it from a hydrophobic, adhesive-resistant state to a hydrophilic, adhesive-receptive state through oxidation or plasma treatment. This parameter change allows the same surface to first prevent sticking during curing, then accept adhesives after curing.
Solution Approach 2:
The invention applies a preliminary release treatment with polysiloxane before curing to prevent sticking, then performs a secondary treatment (oxidation or plasma) after curing to prepare the surface for adhesive application. This two-stage preliminary action sequence resolves the contradiction between sticking prevention and subsequent adhesion.
2Reliability
If polysiloxane release agent remains on the inner liner surface after curing, then sticking prevention is maintained, but surface hydrophilicity and adherability deteriorate
Solution Approach 1:
The invention changes the surface energy and chemical composition parameters of the polysiloxane layer through oxidation or plasma treatment, transforming it from a low-energy, hydrophobic surface to a high-energy, hydrophilic surface that readily accepts adhesives while maintaining the underlying sticking prevention function.
Solution Approach 2:
The invention uses oxidation or plasma treatment as an intermediary process that modifies the polysiloxane surface properties. This intermediary treatment creates a transition state where the surface becomes receptive to adhesives without removing the polysiloxane release agent that provides sticking prevention.
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 treated surface allows for improved adhesion of adhesives and other materials, enhancing the integration of components within the tire, such as noise barriers and sealant layers, without the limitations of the original release treatments.
Implementation Method 1
treating the lower surface of the cured inner liner to convert at least a portion of the polysiloxane moieties to silanol moieties
Implementation Method 2
treating the lower surface of the cured inner liner to increase its hydrophilicity by oxidizing at least a portion of the polysiloxane moieties
Data Source
AI summary
Methods for treating the surface of a cured inner liner are disclosed. By use of these methods a treated, cured inner liner is produced which has a lower surface with increased adherability to other materials (e.g., adhesives). Treated, cured inner liners resulting from such methods as well as tires containing the treated inner liners.