Modified Polyisobutylene Diamide Rubber Compounding
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Solution Overview
Problem
Current rubber compositions face a tradeoff between grip force and rolling resistance, with existing methods failing to simultaneously achieve satisfactory numerical values for both, which is crucial for tire performance, especially in wet conditions and fuel efficiency.
Innovation Solution
A modified polyisobutylene polymer is developed by reacting polyisobutylene with unsaturated dicarboxylic acid anhydride and an amino group-containing silane compound, resulting in a diamide structure that improves processability, filler dispersibility, and enhances grip performance while reducing rolling resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If polyisobutylene is used to improve grip performance, then grip force increases, but rolling resistance increases
Solution Approach 1:
The patent modifies the chemical structure of polyisobutylene by introducing diamide groups through reaction with dicarboxylic acid anhydride and amino silane compounds. This changes the molecular parameters (functional groups, polarity) to achieve simultaneous improvement in grip force and reduction in rolling resistance, resolving the traditional tradeoff between these two properties.
Solution Approach 2:
The modified polyisobutylene creates a composite molecular structure combining the base polyisobutylene chain with diamide functional groups. This composite structure at the molecular level enables the material to exhibit both high grip force and low rolling resistance properties that neither component alone could achieve.
2Force
If filler is added to improve grip performance, then grip force increases, but filler dispersibility deteriorates
Solution Approach 1:
The diamide-modified polyisobutylene acts as an intermediary substance between the filler particles and the rubber matrix. The diamide groups provide compatibility and bonding interfaces that facilitate uniform filler dispersion, preventing aggregation while maintaining structural integrity of the composite.
3Ease of manufacture
If conventional rubber composition is used, then manufacturing is simple, but processability and filler dispersibility are poor
Solution Approach 1:
The polyisobutylene is pre-modified with diamide groups before being incorporated into the rubber composition. This preliminary chemical modification prepares the polymer to have improved processability and filler interaction capabilities, eliminating the need for complex additional processing steps during rubber compound manufacturing.
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 polyisobutylene polymer significantly improves the dispersibility of fillers and physical properties of rubber compositions, achieving high grip performance and low rolling resistance, thereby enhancing tire fuel efficiency and overall performance.
Implementation Method 1
A modified polyisobutylene polymer is developed by reacting polyisobutylene with unsaturated dicarboxylic acid anhydride and an amino group-containing silane compound, resulting in a diamide structure
Data Source
Figure 1~2
AI summary
Disclosed is a modified polyisobutylene polymer for rubber compounding. The modified polyisobutylene polymer is prepared by reacting reactants including a polyisobutylene in which the main chain is isobutylene, an unsaturated dicarboxylic anhydride, and an amino group-containing silane compound. The modified polyisobutylene polymer includes a diamide structure. When the modified polyisobutylene polymer is used as an additive for rubber compounding, the processability of the rubber is increased, the dispersibility of fillers is significantly improved, and the effect of obtaining excellent grip performance and improved rolling resistance can be achieved.