Rubber-Metal Adhesion Composition for Heat-Resistant Bonding
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Solution Overview
Problem
Existing rubber compositions for tires and rubber-metal composites face challenges in achieving heat-resistant adhesion between vulcanized rubber and metal, particularly when using cobalt-containing compounds, which can accelerate thermal deterioration and increase environmental load.
Innovation Solution
A rubber composition containing an organic phosphoric acid compound with an alkyl chain, a vulcanizing agent, and a sulfenamide-based vulcanization accelerator, with minimal or no cobalt-containing compound, to enhance heat-resistant adhesion without the need for N,N-dicyclohexyl-2-benzothiazolylsulfenamide, using a rubber component with an isoprene structure and carbon black as a filler.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a large amount of organic acid cobalt salt is used to improve adhesion between rubber and metal, then initial adhesion is improved, but thermal deterioration of the coating rubber is accelerated
Solution Approach 1:
The patent changes the chemical composition parameters by introducing specific organic phosphoric acid compounds (with particular molecular structures and alkyl chain lengths) and controlling the content of cobalt-containing compounds and N,N-dicyclohexyl-2-benzothiazolylsulfenamide within specific ranges. This compositional parameter change resolves the contradiction by achieving heat-resistant adhesion without the harmful thermal deterioration caused by excessive cobalt salt
Solution Approach 2:
The patent creates a composite chemical system combining organic phosphoric acid compounds, cobalt-containing compounds, and N,N-dicyclohexyl-2-benzothiazolylsulfenamide in specific proportions. This composite approach synergistically improves adhesion while mitigating thermal deterioration, as the organic phosphoric acid compound works together with controlled amounts of cobalt and sulfenamide to achieve both bonding strength and thermal stability
2Strength
If cobalt-containing compounds are used to improve adhesion between vulcanized rubber and metal material, then adhesion is enhanced, but environmental load increases
Solution Approach 1:
The patent optimizes the concentration parameter of cobalt-containing compounds to less than 0.01 parts by mass per 100 parts by mass of rubber component, and controls N,N-dicyclohowyl-2-benzothiazolylsulfenamide to less than 0.08 parts by mass. This precise parameter control reduces environmental load while maintaining adhesion through the synergistic effect of organic phosphoric acid compounds
Solution Approach 2:
The patent replaces long-term harmful cobalt-based adhesion promoters with organic phosphoric acid compounds that provide equivalent adhesion functionality with minimal environmental persistence and harm. The organic phosphoric acid compound serves as a more environmentally friendly alternative that achieves the same bonding purpose without the cumulative environmental burden of cobalt compounds
3Productivity
If N,N-dicyclohowyl-2-benzothiazolylsulfenamide is used in large amounts to improve vulcanization and adhesion, then vulcanization efficiency is improved, but heat-resistant adhesion performance is insufficient
Solution Approach 1:
The patent changes the chemical composition by introducing organic phosphoric acid compounds with specific structural parameters (alkyl chain length of 1-20 carbon atoms) and optimizes the content of N,N-dicyclohowyl-2-benzothiazolylsulfenamide to less than 0.08 parts by mass per 100 parts by mass of rubber component. This parameter change shifts the vulcanization mechanism to achieve better heat-resistant adhesion while maintaining vulcanization efficiency
Solution Approach 2:
The organic phosphoric acid compound acts as an intermediary substance that mediates between the vulcanization process and the adhesion performance. It facilitates vulcanization efficiency while simultaneously providing the chemical basis for heat-resistant adhesion, replacing the insufficient performance of high amounts of N,N-dicyclohowyl-2-benzothiazolylsulfenamide
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 solution provides excellent heat-resistant adhesion between vulcanized rubber and metal, reduces thermal deterioration, and minimizes environmental impact by reducing cobalt usage, while maintaining mechanical strength and durability.
Implementation Method 1
an organic phosphoric acid compound having at least one alkyl chain
Implementation Method 2
a vulcanizing agent; and a vulcanization accelerator
Data Source
AI summary
A rubber composition contains a rubber component, an organic phosphoric acid compound having at least one alkyl chain, a vulcanizing agent, and a vulcanization accelerator. A content of a cobalt-containing compound is 0.00 parts by mass or more and less than 0.01 parts by mass as converted to a cobalt amount per 100 parts by mass of the rubber component. A content of N,N-dicyclohexyl-2-benzothiazolylsulfenamide is 0.00 parts by mass or more and less than 0.08 parts by mass per 100 parts by mass of the rubber component. The rubber composition can be used to produce a rubber-metal composite excellent in heat-resistant adhesion between a vulcanized rubber and a metal.