Low Sulfur Coating Gum for Tire Belt Adhesion
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Solution Overview
Problem
Conventional coating systems for reinforcing tire belts face challenges such as high sulfur content leading to extended preparation times, increased costs, and sensitivity to thermo-oxidation, resulting in cracking issues.
Innovation Solution
A coating gum composition with reduced sulfur content, utilizing a thermoplastic polymeric sheath and a vulcanization system with lower sulfur levels, silica as a major filler, and specific vulcanization accelerators to enhance adhesion and resistance to thermo-oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high sulfur content vulcanization system is used, then adhesion between cable and rubber is improved, but preparation time and manufacturing costs increase
Solution Approach 1:
The patent changes the chemical composition parameters of the vulcanization system by reducing sulfur content from conventional high levels to specifically 0.5-5 phr and adjusting accelerator ratios. This parameter optimization allows achieving adequate adhesion (≥5 N/mm) while reducing preparation time and manufacturing costs, directly resolving the contradiction between adhesion quality and production efficiency
2Reliability
If a high sulfur content vulcanization system is used, then adhesion between cable and rubber is improved, but manufacturing costs increase
Solution Approach 1:
The patent optimizes the chemical composition parameters by reducing sulfur content to 0.5-5 phr and adjusting accelerator ratios (first accelerator 0.1-2 phr, second accelerator 0.1-1 phr). This parameter change reduces material costs while maintaining adhesion performance ≥5 N/mm, directly addressing the contradiction between adhesion quality and manufacturing cost
3Reliability
If a high sulfur content vulcanization system is used, then adhesion between cable and rubber is improved, but resistance to thermo-oxidation deteriorates
Solution Approach 1:
The patent changes the chemical composition by reducing sulfur content to 0.5-5 phr and optimizing accelerator ratios, which reduces susceptibility to thermo-oxidation and prevents cracking. This parameter optimization maintains adhesion ≥5 N/mm while improving resistance to thermo-oxidation, directly resolving the contradiction between adhesion and thermo-oxidation resistance
Solution Approach 2:
The patent uses a composite vulcanization system combining multiple accelerators (thiazole, benzthiazolyl sulfenamide, and second accelerator) with reduced sulfur content. This composite approach creates a more stable chemical system that maintains adhesion while improving resistance to thermo-oxidation and reducing cracking susceptibility
4Reliability
If a high sulfur content vulcanization system is used, then adhesion between cable and rubber is improved, but curing time increases
Solution Approach 1:
The patent optimizes the vulcanization parameters by reducing sulfur content to 0.5-5 phr and adjusting accelerator ratios (first accelerator 0.1-2 phr, second accelerator 0.1-1 phr). This parameter optimization achieves adequate adhesion (≥5 N/mm) while reducing curing time, directly resolving the contradiction between adhesion quality and curing time
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
This approach reduces production costs, simplifies the manufacturing process, and improves the resistance to thermo-oxidation, minimizing cracking and maintaining performance over time.
Implementation Method 1
The presence of a high sulfur content has the advantage of allowing the consumption of some of this sulfur for the sulfidation of metal cables, especially brass-plated ones, and the crosslinking of the elastomeric matrix by vulcanization.
Implementation Method 2
the consumption of some of this sulfur for the sulfidation of metal cables, especially brass-plated ones
Implementation Method 3
improves the resistance to thermo-oxidation, reducing the problem of cracking in the coating mixture
Data Source
AI summary
The invention relates to a reinforced product, usable in particular for the reinforcement of a finished rubber article, comprising one or more textile or metallic reinforcement yarns covered with a sheath comprising a thermoplastic polymeric composition, said sheathed yarn(s) being in turn embedded in a rubber composition referred to as coating rubber, characterised in that the coating rubber is a composition containing at least one diene rubber, silica as a main reinforcing filler and a sulphur vulcanisation system, wherein the ratio of the quantities, in phr (parts by weight for hundred parts by weight of elastomer), of sulphur and reinforcing filler is less than 0.08.