Pneumatic Tire Sealant Adhesion via Release Agent Silicon
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Solution Overview
Problem
Existing methods for manufacturing pneumatic tires with sealant layers face challenges in achieving air retention properties and adhesiveness without compromising tire productivity, as they often result in poor adhesiveness between the tire inner surface and the sealant layer due to the use of release agents, leading to peeling issues and increased manufacturing time.
Innovation Solution
A pneumatic tire manufacturing method involving a bladder with a coating layer of release agent, where the amount of silicon in the release agent is between 0.1 wt.% to 10.0 wt.% ensures sufficient adhesiveness and air retention properties without deteriorating tire productivity, by transferring the release agent to the sealant layer during vulcanization, and using butyl and/or natural rubber for the sealant layer to enhance adhesiveness and prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a release agent is applied to the inner surface of the green tire to prevent adhesion between the green tire and the bladder, then the green tire and bladder do not adhere, but the adhesiveness between the tire inner surface and the sealant layer deteriorates
Solution Approach 1:
The patent applies local quality by creating different surface conditions in different regions. The tire inner surface has a release agent layer in the shoulder region (for easy removal) and a release agent-free region in the tread region (for good sealant adhesion). This spatial differentiation resolves the contradiction between preventing bladder adhesion and ensuring sealant layer adhesiveness.
Solution Approach 2:
The patent segments the tire inner surface into functionally distinct zones: a first region (shoulder portion) where the release agent remains to prevent bladder adhesion, and a second region (tread portion) where the release agent is removed to ensure sealant layer adhesiveness. This segmentation allows each region to optimize its specific function without compromising the other.
2Strength
If buffing is performed on the tire inner surface to remove the release agent, then the release agent is removed and sealant layer adhesiveness is improved, but the gauge of the inner liner is thinned and air retention properties deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-defining the tire inner surface into regions with different release agent coverage before sealant layer application. The release agent is selectively removed from the tread portion region beforehand, creating an optimal bonding surface for the sealant layer without requiring post-vulcanization buffing that would thin the inner liner and compromise air retention.
3Strength
If a film is preliminarily bonded to the inner surface of the green tire and the film is peeled off after vulcanization to remove the release agent, then the release agent is removed and sealant layer adhesiveness is improved, but manufacturing time increases
Solution Approach 1:
The patent extracts the release agent removal step from the post-vulcanization process. Instead of bonding a film and peeling it off after vulcanization (which adds time), the invention directly creates release agent-free regions on the tire inner surface before sealant layer application, eliminating the film bonding and peeling steps while still achieving good sealant layer adhesiveness.
4Strength
If the tire inner surface to which a release agent is adhered is cleaned, then the release agent is partially removed and sealant layer adhesiveness is improved, but the release agent cannot be sufficiently removed and tire productivity is poor
Solution Approach 1:
The patent applies local quality by creating distinct surface regions with different release agent coverage. Instead of attempting to completely clean the entire tire inner surface (which is time-consuming and ineffective), the invention selectively maintains the release agent in the shoulder region while creating release agent-free regions in the tread portion, achieving adequate sealant adhesion without sacrificing productivity.
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 effectively maintains air retention and adhesiveness of the sealant layer while preventing productivity losses, as the release agent inhibits air permeation and ensures puncture sealing properties without the need for additional steps like buffing or film peeling, thereby stabilizing the sealant layer and maintaining tire uniformity.
Implementation Method 1
a pneumatic tire vulcanized using a bladder provided with a coating layer formed of a release agent
Implementation Method 2
an adhesive sealant sticks to the foreign material so that the adhesive sealant is guided into a puncture hole
Implementation Method 3
a release agent is applied to the inner surface of the green tire to prevent the green tire and the bladder from adhering to each other
Data Source
AI summary
A pneumatic tire is vulcanized using a bladder provided with a coating layer formed of a release agent, and includes a sealant layer disposed on an inner surface of a tread portion in a tire circumferential direction. The amount of silicon of the release agents detected in at least a placement region of the sealant layer by fluorescence X-ray analysis is from 0.1 wt. % to 10.0 wt. %.