Inner Liner Rubber Composition Using Dithiosulfate Crosslinking
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Solution Overview
Problem
Existing rubber compositions for inner liners in pneumatic tires lack effective air permeability resistance and low temperature fatigue resistance, particularly in low temperature environments, as previous technologies do not provide sufficient suggestions for these characteristics.
Innovation Solution
A rubber composition for inner liners containing 0.05 to 0.9 parts by mass of 1,6-hexamethylene dithiosulfate sodium dihydrate with respect to 100 parts by mass of a rubber component, where the whole sulfur content is less than 0.3 parts by mass, and comprising a mixture of butyl rubber and diene rubber, along with additives like pulverized bituminous coal and carbon black, to enhance air permeability and low temperature fatigue resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional rubber compositions with higher sulfur content are used, then vulcanization and strength are improved, but low temperature fatigue resistance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by using 1,6-hexamethylene dithiosulfate sodium dihydrate instead of conventional sulfur-based vulcanization systems. This parameter change allows achieving adequate vulcanization while maintaining flexibility and improving low temperature fatigue resistance, as the dithiosulfate compound provides different crosslinking chemistry that is less brittle in cold conditions.
Solution Approach 2:
The patent creates a composite rubber composition by combining butyl rubber (50-100 parts) with diene rubber (0-50 parts) and incorporating 1,6-hexamethylene dithiosulfate sodium dihydrate (0.05-0.9 parts). This composite approach leverages the air impermeability of butyl rubber while the diene rubber and dithiosulfate compound enhance fatigue resistance and flexibility in low temperature environments.
2Object-affected harmful factors
If butyl rubber content is increased to improve air permeability resistance, then air impermeability is improved, but low temperature flexibility deteriorates
Solution Approach 1:
The patent formulates a composite rubber system where butyl rubber (providing air impermeability) is combined with diene rubber (providing flexibility) and 1,6-hexamethylene dithiosulfate sodium dihydrate (providing crosslinking). This composite structure allows the butyl rubber content to be optimized for air resistance while the other components maintain low temperature flexibility.
Solution Approach 2:
The patent applies different functional properties to different components: butyl rubber provides air impermeability in the bulk material, while the diene rubber and dithiosulfate compound provide flexibility and fatigue resistance. This local quality differentiation allows simultaneous optimization of air resistance and flexibility without compromising either property.
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 rubber composition achieves excellent air permeability resistance and low temperature fatigue resistance, maintaining flexibility and inhibiting gas diffusion through the formation of a crosslinked structure, thereby improving tire performance in cold conditions.
Implementation Method 1
the formation of a crosslinked structure, thereby improving tire performance in cold conditions
Data Source
AI summary
Provided are a rubber composition for an inner liner having excellent air permeability resistance and low temperature fatigue resistance, and a pneumatic tire using the same. The rubber composition for an inner liner contains 0.05 to 0.9 parts by mass of 1,6-hexamethylene dithiosulfate sodium dihydrate with respect to 100 parts by mass of a rubber component, in which a whole sulfur content is less than 0.3 parts by mass.