Rubber Composition Abrasion Resistance Fuel Efficiency
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Solution Overview
Problem
Current rubber compositions using silica as a reinforcing filler face challenges in improving abrasion resistance without compromising fuel efficiency, particularly in tire applications.
Innovation Solution
A rubber composition is developed comprising a polymer mixture modified with a compound having an ester or carboxyl group, blended with triamines and silica, which enhances abrasion resistance while maintaining energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If silica is used as a reinforcing filler to improve fuel efficiency, then fuel efficiency is improved, but abrasion resistance deteriorates
Solution Approach 1:
The patent uses a composite rubber composition containing both silica (5-150 parts by mass) and carbon black (10-100 parts by mass) as reinforcing fillers. This composite filler system combines the fuel efficiency benefits of silica with the abrasion resistance properties of carbon black, resolving the contradiction between fuel efficiency and durability
Solution Approach 2:
The patent specifies precise compositional parameters including the use of modified butadiene (10-50 parts by mass) with specific molecular weight ranges (weight-average molecular weight: 1.0×10³ to 1.0×10⁵) and controlled amounts of triamines (0.1-10 parts by mass). These parameter optimizations enhance the rubber-silica interaction, improving both fuel efficiency and abrasion resistance simultaneously
2Reliability
If carbon black is used as a reinforcing filler to improve abrasion resistance, then abrasion resistance is improved, but fuel efficiency deteriorates
Solution Approach 1:
The patent employs a composite filler system combining silica and carbon black in specific proportions. This allows the composition to benefit from carbon black's superior abrasion resistance while silica contributes to reduced rolling resistance and improved fuel efficiency, achieving both durability and energy efficiency
3Use of energy by moving object
If modified butadiene is used to improve fuel efficiency and wet grip, then fuel efficiency and wet grip are improved, but abrasion resistance deteriorates
Solution Approach 1:
The patent optimizes the molecular weight parameters of modified butadiene (weight-average molecular weight: 1.0×10³ to 1.0×10⁵) and controls its content (10-50 parts by mass). This parameter optimization, combined with the addition of triamines and the silica-carbon black composite system, resolves the contradiction by achieving improved fuel efficiency and wet grip while maintaining adequate abrasion resistance
Solution Approach 2:
The patent introduces triamines (0.1-10 parts by mass) as an intermediary substance that modifies the interaction between the rubber polymer and silica filler. This intermediary enhances the reinforcing effect of silica and improves abrasion resistance while preserving the fuel efficiency benefits of the modified butadiene system
Data Source
AI summary
An object of the present invention is to provide a rubber composition which can further improve abrasion resistance without deterioration in energy efficiency, and a pneumatic tire using the rubber composition. The rubber composition comprises a polymer mixture obtained by modifying a polymer composed of at least one of a conjugated diene compound and an aromatic vinyl compound with a compound having at least one of an ester group and a carboxyl group; at least one of triamines; and silica, the polymer mixture having a weight-average molecular weight of 1.0×103 to 1.0×105, and the triamines being a compound represented by the following formula (I):wherein each of RA, RB, RC, RD and RE independently represents a hydrogen atom or an alkyl group, and each of ALK1 and ALK2 independently represents an alkylene group.