Self-Sealing Tire Protective Layer Prevents Vulcanization Adhesion
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Solution Overview
Problem
Pneumatic tires with self-sealing layers face issues during vulcanization due to the tacky nature of the self-sealing material, which adheres to the curing membrane and can lead to reduced service life and rapid degradation, with existing non-stick agents being inadequate.
Innovation Solution
A chlorinated thermoplastic polymer film with specific plasticizing additives and secondary heat stabilizers is used as a protective layer between the self-sealing layer and the curing membrane, preventing adhesion and migration, and maintaining mechanical strength and high-temperature resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a self-sealing layer is positioned in the uncured blank of a pneumatic tyre, then the tyre can achieve automatic sealing of perforations during service, but the self-sealing layer adheres strongly to the curing membrane during vulcanization and causes rapid degradation
Solution Approach 1:
A protective layer comprising a chlorinated thermoplastic polymer is introduced as an intermediary between the self-sealing layer and the curing membrane. This protective layer prevents direct contact and adhesion between the tacky self-sealing material and the membrane during vulcanization, while allowing the self-sealing function to operate effectively during service.
Solution Approach 2:
The protective layer is designed with specific thermal and mechanical parameters - it remains stable at vulcanization temperatures (resisting degradation) but can be separated after curing. The chlorinated thermoplastic polymer exhibits parameter changes in its adhesion properties between the high-temperature vulcanization phase and the service phase, enabling it to protect during curing and then be removed without damaging the self-sealing layer.
2Ease of manufacture
If the self-sealing layer is placed in the uncured blank, then manufacturing integration is achieved, but constituents of the self-sealing layer migrate into the curing membrane during high-temperature vulcanization
Solution Approach 1:
The protective layer acts as a barrier membrane preventing the migration of self-sealing layer constituents into the curing membrane during vulcanization. It maintains physical separation between the two materials while allowing both to be present in the uncured blank for integrated manufacturing.
Solution Approach 2:
The protective layer is implemented as a thin film structure that provides effective barrier properties against material migration. The film is sufficiently thin to not interfere with the vulcanization process or final tyre performance, yet thick enough to prevent constituent migration during high-temperature curing.
3Object-generated harmful factors
If non-stick agents such as whitewashes or liquid silicones are used, then adhesion to curing membrane is reduced, but they are completely inadequate for solving the problem
Solution Approach 1:
The protective layer is formulated as a composite material system - a chlorinated thermoplastic polymer base combined with specific plasticizing additives and heat stabilizers. This composite structure provides both the non-stick properties needed to prevent adhesion and the thermal stability required to withstand vulcanization temperatures, overcoming the limitations of simple non-stick agents.
Solution Approach 2:
The protective layer material is designed with specific parameter ranges: molecular weight of 2000-10000 g/mol for the plasticizing additives to ensure thermal stability without excessive migration, and specific compositional ratios that balance non-stick properties with structural integrity during high-temperature processing.
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 effectively prevents the self-sealing layer from adhering to the curing membrane, reduces material migration, and enhances the thermal stability and mechanical strength of the tire, ensuring prolonged service life and reliable sealing performance.
Implementation Method 1
A chlorinated thermoplastic polymer film with specific plasticizing additives and secondary heat stabilizers is used as a protective layer between the self-sealing layer and the curing membrane, preventing adhesion
Implementation Method 2
A chlorinated thermoplastic polymer film with specific plasticizing additives and secondary heat stabilizers is used as a protective layer between the self-sealing layer and the curing membrane, preventing adhesion and migration
Implementation Method 3
The plasticizers included in the above list favour good thermal stability of the chlorinated thermoplastic film
Implementation Method 4
a chlorinated thermoplastic polymer film with specific plasticizing additives and secondary heat stabilizers
Data Source
AI summary
A pneumatic tire with a built-in self-sealing layer is described. The tire includes an outer rubbery tread, a carcass reinforcement, a gastight layer located at an inside position relative to the carcass reinforcement, a protective layer positioned innermost, and a self-sealing layer adjacent to the protective layer and located at an inside position relative to the gastight layer. The protective layer is a chlorinated thermoplastic polymer film.