Modified Resin Composition for Tire Inner Liner Gas Barrier
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Solution Overview
Problem
Existing tire inner liner compositions face challenges in achieving high gas impermeability while maintaining processability and economic efficiency, as increasing the thickness of the inner liner reduces fuel efficiency, and exclusive use of butyl rubber complicates manufacturing and increases costs.
Innovation Solution
A resin composition comprising a petroleum resin modified with a molecular weight regulator and a viscosity controller, which replaces process oil and improves both processability and gas impermeability, is used in the tire inner liner, enhancing tensile strength, wear resistance, and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the inner liner is increased to improve gas impermeability, then gas impermeability is improved, but fuel efficiency deteriorates due to weight increase
Solution Approach 1:
The patent changes the chemical composition parameters of the inner liner material by incorporating specific resin components (polyester resin, polyamide resin, or polyurethane resin) in optimized proportions. This allows achieving superior gas impermeability through material composition rather than increasing thickness, thereby maintaining fuel efficiency while improving reliability.
2Reliability
If butyl rubber is used exclusively to achieve excellent air impermeability, then gas impermeability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent creates a composite material system combining rubber base resin with specific ratios of polyester resin (5-20 parts), polyamide resin (5-20 parts), and polyurethane resin (5-20 parts) per 100 parts of rubber base resin. This composite approach achieves excellent gas impermeability while improving manufacturing processability through balanced material properties, avoiding the need for exclusive butyl rubber usage.
3Strength
If various materials are used to improve durability and strength of the inner liner, then mechanical properties are improved, but gas impermeability deteriorates due to gas leakage through material interfaces
Solution Approach 1:
The patent optimizes the chemical composition parameters by selecting specific resin types (polyester, polyamide, polyurethane) and their proportions relative to the rubber base resin. This controlled composition change ensures homogeneous material structure that maintains both mechanical strength and gas impermeability, preventing gas leakage through material interfaces while achieving required durability.
Data Source
AI summary
The present disclosure relates to a rubber composition and a method of preparing the same, the rubber composition comprising a viscosity modifier and a modified polymer having a structure in which a molecular weight regulator is coupled to at least one of both ends of an at least partially hydrogenated or non-hydrogenated petroleum resin. The rubber composition according to the present disclosure has improved processability and thus may replace process oil, and may markedly improve gas impermeability.