Gas Barrier Resin Composition for Tire Inner Liner Processability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current tire inner liners face a trade-off between air permeation resistance and manufacturing processability, with increasing thickness or halogenated butyl rubber content leading to weight and cost issues, and compounding with other materials decreasing air permeation resistance.
Innovation Solution
A resin composition is developed, comprising a base resin of non-hydrogenated or partially hydrogenated petroleum resin and an additive of modified petroleum resin with a molecular weight modifier bonded to its ends, which improves dispersion and compounding efficiency without using process oils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the inner liner is increased to improve air permeation resistance, then air permeation resistance is improved, but the total weight of the tire increases causing decreased fuel efficiency
Solution Approach 1:
The patent changes the chemical composition parameters of the rubber material by incorporating specific ratios of halogenated butyl rubber (20-60 parts), natural rubber (30-70 parts), and synthetic isoprene rubber (10-40 parts), along with controlled amounts of process oil (5-30 parts) and fillers (20-60 parts). This compositional parameter optimization achieves high air permeation resistance without increasing thickness or overall weight.
2Reliability
If the content of halogenated butyl rubber is increased to improve air permeation resistance, then air permeation resistance is improved, but processability in tire manufacturing decreases
Solution Approach 1:
The patent optimizes the compositional parameters to maintain halogenated butyl rubber content at 20-60 parts per 100 parts of rubber base, which provides sufficient air permeation resistance while preserving processability. The balanced formulation with natural rubber and synthetic isoprene rubber ensures good mixing and processing characteristics.
Solution Approach 2:
The patent creates a composite rubber material system combining halogenated butyl rubber, natural rubber, and synthetic isoprene rubber in specific proportions. This composite approach leverages the excellent air permeation resistance of halogenated butyl rubber while the other components maintain processability and processing characteristics.
3Ease of manufacture
If other materials such as process oils, processing aid agents, and fillers are used to compound the rubber to improve processability, then processability is improved, but resistance to air permeation decreases
Solution Approach 1:
The patent carefully controls the parameters of auxiliary materials: process oil at 5-30 parts, fillers at 20-60 parts per 100 parts of rubber base. These optimized quantities improve processability while minimizing the negative impact on air permeation resistance through precise compositional balancing.
Data Source
Figure 1
AI summary
The present invention relates to a resin composition comprising: a base resin comprising a petroleum resin of which at least a part is hydrogenated or non-hydrogenated; and an additive comprising a modified C9 polymer having a structure in which a molecular weight modifier binds to at least one terminal of the two terminals of the petroleum resin of which at least a part is hydrogenated or non-hydrogenated. The present invention also relates to a gas barrier film comprising the resin composition, and a tire.