Rubber Composition Accelerates Crosslinking via Benzothiazole Derivative
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Solution Overview
Problem
Conventional rubber compositions containing organic sulfur compounds require a long time for crosslinking and often necessitate a large amount of co-crosslinking agents to achieve high hardness in the cured product.
Innovation Solution
A rubber composition comprising a base rubber, a co-crosslinking agent, a crosslinking initiator, a benzothiazole derivative, and an organic sulfur compound, where the benzothiazole derivative includes specific compounds that accelerate crosslinking and reduce the time required for the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a conventional rubber composition containing an organic sulfur compound is used, then the composition can be processed, but the crosslinking time becomes excessively long
Solution Approach 1:
The patent changes the chemical parameters of the accelerator system by introducing a specific benzothiazole derivative with electron-withdrawing groups (such as 5-chloro-2-mercaptobenzothiazole or 5-trifluoromethyl-2-mercaptobenzothiazole) in combination with an organic sulfur compound. This parameter change in the accelerator structure enables significantly faster crosslinking reaction while maintaining complete crosslinking, thus reducing crosslinking time and improving productivity.
2Strength
If a large amount of co-crosslinking agent is used to increase the hardness of the cured product, then the hardness is improved, but the crosslinking efficiency decreases and crosslinking time increases
Solution Approach 1:
The patent changes the accelerator parameters to achieve high crosslinking efficiency, which allows obtaining high hardness with a smaller amount of co-crosslinking agent. The specific benzothiazole derivative accelerates the crosslinking reaction so effectively that complete crosslinking is achieved with reduced co-crosslinking agent content, thereby reducing crosslinking time while maintaining high hardness.
Solution Approach 2:
The patent uses a composite accelerator system combining a benzothiazole derivative with an organic sulfur compound. This composite accelerator system produces a synergistic effect that enhances crosslinking efficiency, allowing high hardness to be achieved with less co-crosslinking agent and in shorter time compared to conventional single accelerators.
3Device complexity
If a conventional accelerator system is used with organic sulfur compound, then the formulation is simple, but crosslinking cannot be effectively formed requiring large amount of co-crosslinking agent
Solution Approach 1:
The patent modifies the accelerator parameters by selecting specific benzothiazole derivatives with electron-withdrawing groups (such as 5-chloro-2-mercaptobenzothiazole, 5-trifluoromethyl-2-mercaptobenzothiazole, or 5-fluoro-2-mercaptobenzothiazole) combined with organic sulfur compounds. This parameter change enables effective crosslinking formation with reduced co-crosslinking agent content, maintaining formulation simplicity while improving crosslinking efficiency.
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 achieves high hardness in the molded product while reducing the time needed for crosslinking and minimizing the amount of co-crosslinking agent required.
Implementation Method 1
a rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, (d) a benzothiazole derivative, and (e) an organic sulfur compound
Implementation Method 2
the benzothiazole derivative includes a compound represented by the formula (1) and/or a compound represented by the formula (2)... effectively forms the crosslinking, and shortens the time required for crosslinking
Data Source
AI summary
An object of the present disclosure is to provide a rubber composition containing an organic sulfur compound from which a molded product having a high hardness can be obtained. The present disclosure provides a rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, (d) a benzothiazole derivative, and (e) an organic sulfur compound, wherein (d) the benzothiazole derivative is a compound represented by the formula (1) and/or a compound represented by the formula (2).[R1 represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, an aryl group having 4 to 14 carbon atoms, or a metal atom,R2 to R5 are identical to or different from each other, and represent an electron-withdrawing group or a hydrogen atom, and at least one of R3 to R5 is an electron-withdrawing group.]