Modified Isoprene Polymer Rubber Composition for Low Heat Build-Up
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Solution Overview
Problem
The existing rubber compositions with epoxidized natural rubber and reinforcing fillers, such as carbon black and silica, do not achieve sufficient dispersibility and low heat build-up, which are required for modern applications.
Innovation Solution
A rubber composition containing a modified isoprene polymer with a nitrogen and silicon atom functional group at the terminal and a viscosity of 2000 Pa·s or less, combined with carbon black and/or silica, and a silane coupling agent, to enhance dispersibility and reduce heat build-up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If epoxidized natural rubber is blended to a natural rubber with reinforcing fillers, then some characteristics are improved, but dispersibility of reinforcing fillers does not necessarily satisfy the required level
Solution Approach 1:
The patent changes the chemical structure parameters of the rubber polymer by introducing specific functional groups (nitrogen-containing and silicon-containing groups) at the terminal ends of the isoprene polymer chains. This structural modification enables better interaction with reinforcing fillers, achieving both improved dispersibility and low heat build-up characteristics simultaneously
Solution Approach 2:
The patent creates a composite rubber composition by combining modified isoprene polymer with specific functional groups and reinforcing fillers (carbon black and/or silica). The functional groups act as bridging elements that composite the filler particles into the rubber matrix, preventing aggregation while maintaining low heat build-up
2Strength
If reinforcing fillers are blended in rubber composition, then reinforcement is achieved, but aggregation of fillers occurs leading to insufficient dispersibility
Solution Approach 1:
The modified isoprene polymer with nitrogen-containing and silicon-containing functional groups acts as an intermediary between the reinforcing fillers and the rubber matrix. The functional groups interact with filler surfaces while the polymer chains integrate into the rubber, preventing filler aggregation and achieving uniform dispersion while maintaining reinforcement
Solution Approach 2:
The patent introduces specific functional groups at the terminal ends of the isoprene polymer chains rather than uniformly throughout the polymer structure. This localized modification at the chain ends provides specific interaction sites for filler attachment, enabling controlled dispersion while preserving the bulk properties of the rubber for reinforcement
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 modified isoprene polymer significantly improves the dispersibility of reinforcing fillers and reduces heat build-up in the rubber composition, achieving superior performance in tire and other rubber-based applications.
Implementation Method 1
the modified isoprene polymer having a functional group having a nitrogen atom and a silicon atom at a terminal
Data Source
AI summary
The present invention is to provide a rubber composition having excellent dispersibility and low heat build-up. A rubber composition according to an embodiment of the present invention contains a modified isoprene polymer, a rubber component (besides the modified isoprene polymer), and a reinforcing filler, the reinforcing filler containing carbon black and/or silica, the modified isoprene polymer having a functional group having a nitrogen atom and a silicon atom at a terminal, and a viscosity of the modified isoprene polymer being 2000 Pa·s or less. However, the viscosity is measured by using a cone and plate viscometer.