Construction Tire Rubber Composition Cut Resistance Heat Build-Up
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Solution Overview
Problem
Pneumatic tires for construction vehicles face a trade-off between cut resistance and low heat build-up, with existing compositions failing to adequately enhance both properties while maintaining moldability, particularly due to the difficulty in molding large tires and the adverse effects of compounding agents on heat build-up.
Innovation Solution
A rubber composition containing 20-40 parts by weight of carbon black, 15-30 parts by weight of silica, 2.0-3.5 parts by weight of sulfur, and a sulfur-containing silane coupling agent per 100 parts by weight of diene rubber, which balances cut resistance and heat build-up while improving moldability by reducing the need for softening agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbon black is increased to enhance cut resistance, then heat build-up increases, but low heat build-up is required to prevent tire overheating
Solution Approach 1:
The patent optimizes the proportion of carbon black within a specific range (20-40 parts by weight per 100 parts of diene rubber) to achieve the balance between cut resistance and heat build-up. This parameter optimization allows the rubber composition to attain sufficient mechanical strength while controlling the heat generation during tire operation.
Solution Approach 2:
The patent creates a composite rubber composition by combining diene rubber (80-100 wt.% natural rubber) with carbon black (20-40 parts) and silica (15-30 parts) in specific proportions. This composite material approach allows the synergistic effect of rubber elasticity, carbon black reinforcement, and silica heat dissipation to simultaneously achieve cut resistance and low heat build-up.
2Ease of manufacture
If softening agents are added to improve moldability of large tires, then moldability is enhanced, but heat build-up increases
Solution Approach 1:
The patent reduces the compounding ratio of softening agents and oils to minimal or zero levels, achieving moldability through optimized rubber composition (high natural rubber content at 80-100 wt.%) and controlled sulfur content (2.0-3.5 parts). This parameter change eliminates the need for excessive softening agents that would increase heat build-up.
Solution Approach 2:
The patent extracts or removes harmful softening agents and oils from the rubber composition, achieving moldability without these heat-generating additives. The composition relies on the inherent properties of natural rubber and precise filler ratios rather than softening agents to achieve suitable processing characteristics.
3Strength
If sulfur content is increased to enhance cut resistance, then mechanical strength improves, but heat build-up increases
Solution Approach 1:
The patent optimizes sulfur content within a specific range (2.0-3.5 parts by weight per 100 parts of diene rubber) to achieve sufficient vulcanization and mechanical strength while controlling heat build-up. This precise parameter control ensures adequate cross-linking density for cut resistance without excessive sulfur that would generate more heat.
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 rubber composition effectively enhances cut resistance and moldability, suppressing heat build-up and preventing tire failure due to overheating, leading to improved durability and efficient production of high-quality tires.
Implementation Method 1
a rubber composition containing: from 20 to 40 parts by weight of carbon black, from 15 to 30 parts by weight of silica
Implementation Method 2
from 2.0 to 3.5 parts by weight of sulfur, and a sulfur-containing silane coupling agent; the total amount of sulfur in the sulfur and the sulfur-containing silane coupling agent being from 2.3 to 4.0 parts by weight
Data Source
AI summary
The present technology provides a rubber composition containing: from 20 to 40 parts by weight of carbon black, from 15 to 30 parts by weight of silica, from 2.0 to 3.5 parts by weight of sulfur, and a sulfur-containing silane coupling agent, per 100 parts by weight of diene rubber that contains from 80 to 100 wt. % of natural rubber, and from 20 to 0 wt. % of isoprene rubber; the total amount of sulfur in the sulfur and the sulfur-containing silane coupling agent being from 2.3 to 4.0 parts by weight.