Multi-component copolymer for balancing wear resistance and heat generation
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Solution Overview
Problem
There is a tradeoff between low heat generating property and wear resistance in existing rubber copolymers, necessitating the development of a material that simultaneously exhibits both excellent low heat generating property and wear resistance.
Innovation Solution
A multi-component copolymer comprising conjugated diene units, non-conjugated olefin units, and aromatic vinyl units, with a peak top molecular weight of chain parts divided by these units ranging from 1,000 to 40,000, which enhances micro entanglement and stress dispersion, thereby improving low heat generating property and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional copolymer compositions are used to improve wear resistance, then wear resistance is enhanced, but low heat generating property deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the peak top molecular weight of chain parts to be 1,000 or more and less than 40,000, and by specifying the cis-1,4 bond content of conjugated diene parts to be 70.5 mol% or more. These parameter optimizations enable the copolymer to simultaneously achieve excellent wear resistance and low heat generating property, resolving the tradeoff between these two characteristics.
Solution Approach 2:
The patent employs composite material principles by creating a multi-component copolymer system comprising conjugated diene compounds (with specific cis-1,4 bonding), non-conjugated olefin compounds, and aromatic vinyl compounds. This composite structure combines the advantages of different polymer components to achieve both high wear resistance and low heat generation, overcoming the limitations of single-component or simple binary copolymers.
2Loss of energy
If copolymer composition is optimized for low heat generating property, then low heat generating property is improved, but wear resistance deteriorates
Solution Approach 1:
The patent resolves this contradiction by optimizing multiple parameters simultaneously: the peak top molecular weight of chain parts is controlled to be 1,000 or more and less than 40,000, the cis-1,4 bond content is maintained at 70.5 mol% or more, and specific compositional ratios of conjugated diene, non-conjugated olefin, and aromatic vinyl units are established. This multi-parameter optimization enables simultaneous achievement of low heat generation and high wear resistance.
Solution Approach 2:
The patent uses composite material principles by formulating a tri-component copolymer system that integrates conjugated diene parts (providing mechanical strength and wear resistance), non-conjugated olefin parts (contributing to low heat generation), and aromatic vinyl parts (enhancing overall performance). This composite structure allows the material to exhibit both low heat generating property and high wear resistance simultaneously.
Data Source
AI summary
Provided is a multi-component copolymer comprising conjugated diene units, non-conjugated olefin units and aromatic vinyl units, wherein: a peak top molecular weight of chain parts, divided by the conjugated diene units and each containing one or more of the non-conjugated olefin units and/or one or more of the aromatic vinyl units, is 1,000 or more and less than 40,000. A rubber composition comprising the multi-component copolymer, a crosslinked rubber composition, and a rubber article comprising the crosslinked rubber composition are also provided.