Heavy-Load Tire Rubber Composition with Nitrone Modification
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Solution Overview
Problem
Heavy-load tires face challenges with high heat build-up and poor rubber flowability during vulcanization, leading to potential tire damage and reduced performance.
Innovation Solution
A rubber composition combining natural rubber, a modified conjugated diene polymer obtained by reacting with a nitrone compound, and carbon black, with specific ratios and optional silica and thermoplastic resin, to enhance low heat build-up and flowability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rubber composition containing natural rubber and carbon black is used, then wear resistance is improved, but heat build-up increases
Solution Approach 1:
The patent modifies the chemical structure of the diene rubber by introducing nitrone groups through reaction with nitrone compounds. This chemical parameter change alters the rubber's molecular characteristics, enabling simultaneous achievement of low heat build-up and high wear resistance that cannot be obtained with conventional natural rubber formulations alone.
Solution Approach 2:
The patent creates a composite rubber system by combining natural rubber with synthetic diene rubber containing nitrone groups. This composite material approach allows the formulation to leverage the wear resistance of natural rubber while the nitrone-modified synthetic component contributes to reduced heat build-up, achieving a balance that resolves the technical contradiction.
2Strength
If a rubber composition containing natural rubber is used, then wear resistance is improved, but rubber flowability during vulcanization deteriorates
Solution Approach 1:
The introduction of nitrone groups into the diene rubber structure changes the rheological parameters of the rubber compound. This chemical modification reduces the viscosity and improves flow characteristics during vulcanization, allowing the rubber to flow properly from bead section to side section without the streaking and block breakage problems associated with high natural rubber content formulations.
Solution Approach 2:
The nitrone-modified diene rubber acts as an intermediary component that mediates between the high wear resistance requirement (satisfied by natural rubber) and the flowability requirement. This intermediate substance allows the formulation to maintain natural rubber's protective qualities while introducing flow-enhancing characteristics that prevent manufacturing defects.
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 composition achieves excellent low heat build-up and improved rubber flowability during vulcanization, resulting in enhanced tire performance and wear resistance.
Implementation Method 1
a modified polymer obtained by modifying a conjugated diene polymer with a nitrone compound
Implementation Method 2
rubber compositions containing a carbon black or a silica compounded with a rubber component containing a natural rubber as a main component are primarily used as rubber compositions for heavy-load tires
Data Source
AI summary
An object of the present invention is to provide a rubber composition for a heavy-load tire having excellent low heat build-up when formed into a tire and excellent flowability of the rubber during vulcanization, and a pneumatic tire produced using the rubber composition. The rubber composition for a heavy-load tire contains a diene rubber and a carbon black; the diene rubber containing: a natural rubber; and a modified polymer obtained by modifying a conjugated diene polymer with a nitrone compound; the content of the natural rubber in the diene rubber being not less than 60 mass %; and the content of the modified polymer in the diene rubber being not greater than 40 mass %; and the content of the carbon black being from 30 to 70 parts by mass per 100 parts by mass of the diene rubber.