Rubber Composition Air Permeation Flexure Failure Resistance
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Solution Overview
Problem
Existing rubber compositions for inner tire liners excel in air permeation resistance but often compromise on flexure failure resistance and low-temperature characteristics, particularly in cold environments, and fail to meet weight-saving requirements.
Innovation Solution
A rubber composition comprising 100 parts by mass of rubber ingredient, 1 to 9 parts by mass of carbon black, and 80 to 150 parts by mass of layered or platy clay mineral, with the rubber ingredient being predominantly butyl-based rubber, and the carbon black and clay mineral characterized by specific iodine adsorption and aspect ratios, respectively, to enhance air permeation and flexure failure resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soft carbon black is highly filled in rubber composition to improve air permeation resistance, then air permeation resistance is improved, but flexure failure resistance deteriorates
Solution Approach 1:
The patent uses a composite filler system combining layered clay mineral (providing barrier effect for air permeation resistance) with soft carbon black (providing reinforcement for flexure failure resistance). This composite approach allows both properties to be optimized simultaneously rather than relying on a single filler type.
Solution Approach 2:
The patent specifies precise parameter ranges: carbon black at 1-9 parts by mass per 100 parts rubber, clay mineral at 80-150 parts by mass per 100 parts rubber, and aspect ratio of clay mineral at 2-200. These parameter optimizations ensure the balance between air permeation resistance and flexure failure resistance.
2Reliability
If soft carbon black is highly filled in rubber composition to improve air permeation resistance, then air permeation resistance is improved, but low-temperature characteristics deteriorate
Solution Approach 1:
The layered clay mineral structure provides a physical barrier that maintains effectiveness at low temperatures, complementing the carbon black's reinforcement properties. This composite system ensures both air permeation resistance and low-temperature characteristics are maintained.
Solution Approach 2:
The patent optimizes the ratio of clay mineral to carbon black (80-150 parts clay to 1-9 parts carbon black per 100 parts rubber) to ensure sufficient low-temperature flexibility while maintaining air permeation resistance. The aspect ratio control of clay mineral (2-200) also contributes to maintaining low-temperature properties.
3Reliability
If clay mineral is incorporated to enhance air permeation resistance, then air permeation resistance is improved, but flexure failure resistance may worsen
Solution Approach 1:
The patent combines clay mineral with soft carbon black in specific proportions to create a synergistic effect. The clay mineral provides the barrier structure for air permeation resistance, while the soft carbon black network provides reinforcement for flexure failure resistance, preventing the deterioration that would occur with clay mineral alone.
Solution Approach 2:
The patent specifies that soft carbon black should have iodine adsorption of at most 50 mg/g and dibutyl phthalate absorption of at most 125 ml/100 g, ensuring appropriate softness and reinforcement properties. The carbon black content (1-9 parts per 100 parts rubber) is optimized to provide sufficient flexure failure resistance while maintaining air permeation resistance through the clay mineral barrier.
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 composition achieves improved air permeation resistance and flexure failure resistance, enabling weight-saving tires with enhanced low-temperature performance and reduced air permeability, making it suitable for various vehicle types.
Implementation Method 1
the layered or platy clay mineral (C) can be aligned regularly and nearly in parallel to the extrusion direction of the composition
Data Source
AI summary
A rubber composition excellent in air permeation resistance and improved in flexure failure resistance, and a weight-saving pneumatic tire excellent in air permeation resistance and improved in flexure failure resistance in which the rubber composition is used as the inner liner therein is provided. The rubber composition contains, relative to 100 parts by mass of the rubber ingredient (A) therein, from 1 to 9 parts by mass of carbon black (B) and from 80 to 150 parts by mass of a layered or platy clay mineral (C).