Innerliner Rubber Composition for Low-Temperature Tire Crack Resistance
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Solution Overview
Problem
Existing pneumatic tire innerliner rubber compositions struggle to balance steering stability and crack growth resistance in low-temperature environments, as increasing zinc oxide and petroleum-based resin levels enhance hardness but compromise cracking resistance, and conventional formulations fail to achieve both properties simultaneously.
Innovation Solution
A pneumatic tire with an innerliner rubber composition containing 25-75 parts by mass of carbon black with a nitrogen adsorption specific surface area of 25-95 m2/g, 1-13 parts by mass of resin, and 0.1-1.8 parts by mass of zinc oxide per 100 parts of halogenated butyl rubber, ensuring a dynamic storage elastic modulus not greater than 600 Mpa at -45°C, along with a tie rubber composition that maintains a balanced rubber hardness ratio, enhances steering stability and crack growth resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the compounded amounts of zinc oxide and petroleum-based resin in halogenated butyl rubber are increased to enhance the degree of hardness, then steering stability is improved, but the glass transition temperature Tg increases and crack growth resistance in low-temperature environment deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the amounts of zinc oxide (0.1-1.8 parts by mass) and petroleum-based resin (1-13 parts by mass) in the rubber composition, and by selecting carbon black with specific surface area (20-35 m2/g). This optimization of compositional parameters achieves the desired balance between hardness and crack growth resistance without excessively increasing Tg
Solution Approach 2:
The patent uses composite materials by combining halogenated butyl rubber with specific proportions of carbon black, zinc oxide, and petroleum-based resin. This composite formulation creates a synergistic effect where the carbon black provides reinforcement and the controlled amounts of zinc oxide and resin enhance hardness while maintaining low-temperature flexibility
2Strength
If zinc oxide amount is increased to improve steering stability, then rubber hardness increases, but zinc oxide dispersion becomes difficult and crack growth resistance deteriorates
Solution Approach 1:
The patent applies parameter changes by limiting zinc oxide to a specific range (0.1-1.8 parts by mass per 100 parts of diene rubber). This controlled parameter optimization ensures sufficient hardness while preventing excessive zinc oxide content that would cause poor dispersion and maintain crack growth resistance
Data Source
AI summary
A pneumatic tire includes an innerliner and a tie rubber. A rubber composition for an innerliner constituting the innerliner includes from 25 to 75 parts by mass of a carbon black having a nitrogen adsorption specific surface area from 25 to 95 m2/g, from 1 to 13 parts by mass of a resin, and from 0.1 to 1.8 parts by mass of zinc oxide, per 100 parts by mass of a diene rubber containing from 50 to 100 parts by mass of halogenated butyl rubber, and the dynamic storage modulus at −45° C. of the rubber composition is not greater than 600 Mpa.