Modified Petroleum Resin Composition for Tire Inner Liner Gas Barrier
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Solution Overview
Problem
Existing tire inner liners face challenges in achieving high gas impermeability and processability due to the use of various materials, which can lead to gas leakage and increased manufacturing costs, and conventional methods like increasing thickness or using butyl rubber alone compromise fuel efficiency or processability.
Innovation Solution
A resin composition is developed using a modified polymer with a petroleum resin modified by a molecular weight regulator and viscosity controller, replacing process oil and improving both processability and gas impermeability by forming a compatibilized film in the amorphous region of the polymer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the rubber layer is increased to improve gas impermeability, then gas impermeability is improved, but fuel efficiency deteriorates due to increased weight
Solution Approach 1:
The patent changes the chemical composition parameters of the rubber material by incorporating specific ratios of halogenated butyl rubber (20-40 parts), non-halogenated butyl rubber (60-80 parts), and functionalized polyolefin resin (1-20 parts). This compositional parameter change improves gas impermeability without increasing thickness, thereby avoiding the weight penalty that would reduce fuel efficiency.
2Reliability
If halogenated butyl rubber is increased to improve gas impermeability, then gas impermeability is improved, but processability deteriorates
Solution Approach 1:
The patent creates a composite rubber composition combining halogenated butyl rubber, non-halogenated butyl rubber, and functionalized polyolefin resin. The functionalized polyolefin resin acts as a processing aid that improves processability while the halogenated butyl rubber provides gas impermeability. This composite approach allows both requirements to be satisfied simultaneously.
Solution Approach 2:
The functionalized polyolefin resin serves as an intermediary material that facilitates processing. It has functional groups that enable compatibility with halogenated butyl rubber and improve overall processability, acting as a mediator between the gas impermeability requirement (halogenated rubber) and the processability requirement.
3Ease of manufacture
If butyl rubber is mixed with other materials to improve processability, then processability is improved, but gas impermeability deteriorates
Solution Approach 1:
The patent carefully controls the quantity parameters of additives, limiting the functionalized polyolefin resin to 1-20 parts per 100 parts of rubber. This controlled parameter change ensures that processability is improved without exceeding the threshold that would compromise gas impermeability. The specific ratio optimization resolves the contradiction between these two properties.
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 resin composition enhances processability and gas impermeability, maintaining pneumatic pressure, improving durability and fuel efficiency, while maintaining compatibility with rubber, thus enhancing tire performance.
Implementation Method 1
a modified polymer having a structure in which a molecular weight regulator is coupled to at least one of both ends of a petroleum resin that is at least partially hydrogenated or non-hydrogenated by a polymerization reaction
Implementation Method 2
the present inventors investigated a petroleum resin which can replace a process oil... confirmed that the process oil can be entirely replaced... by using a rubber composition for a tire inner liner comprising a petroleum resin modified with a molecular weight regulator
Implementation Method 3
a petroleum resin that is at least partially hydrogenated or non-hydrogenated... a viscosity controller
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.