Liquid Vulcanization Accelerator Composition for Rubber
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vulcanization accelerators for rubber compositions are either costly to produce or lack effectiveness, necessitating the development of alternative accelerators that are easily prepared and highly efficient.
Innovation Solution
A composition comprising N-(1,3-benzothiazol-2-ylsulfanyl)-2-methyl-cyclohexanamine and N-(1,3-benzothiazol-2-ylsulfanyl)-4-methyl-cyclohexanamine in a specific weight ratio, which is liquid at 20°C and 1 bar, is used as a vulcanization accelerator, synthesized through a process involving mercaptobenzothiazole and cyclohexylamines with an oxidizing agent, allowing for efficient crosslinking of rubber compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If standard vulcanization accelerators like CBS are used, then effective crosslinking is achieved, but the accelerator is solid and difficult to handle and apply
Solution Approach 1:
The patent changes the physical state parameter of the accelerator from solid to liquid by modifying the molecular structure (adding methyl groups at positions 2 and 4 of the cyclohexyl ring) and optimizing the composition ratio (60:40 weight ratio of ortho- to para-isomer). This liquid form maintains equivalent vulcanization effectiveness while dramatically improving ease of handling and application.
2Ease of operation
If alternative vulcanization accelerators are developed, then ease of handling is improved, but production cost may increase
Solution Approach 1:
The patent utilizes a side reaction product (para-isomer) from the existing CBS production process. Instead of discarding this byproduct, it is incorporated into the accelerator composition at a 60:40 ratio, turning a waste stream into a valuable component. This approach maintains ease of manufacture while achieving the desired liquid properties and handling characteristics.
3Stability of the object's composition
If pure ortho-isomer is produced separately, then consistent composition is achieved, but production complexity and cost increase
Solution Approach 1:
The patent merges the ortho-isomer (desired product) and para-isomer (side product) into a unified composition with a specific 60:40 weight ratio. This combination approach simplifies the production process by eliminating the need for separate production and purification of the ortho-isomer, while maintaining consistent composition through controlled ratio specification.
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 effectively accelerates vulcanization, offering equivalent reactivity and properties to standard accelerators while being easier to handle and apply, with a preferred ratio of 60:40 weight percentage of the two compounds, demonstrating high effectiveness in rubber compositions.
Implementation Method 1
mercaptobenzothiazole or the alkali metal salts or dimers thereof are preferably reacted with the amine and thereafter with an oxidizing agent such as chlorine, hypochlorite, H2O2 or a combination of oxidizing agents
Data Source
AI summary
A composition comprising compound (I) of formula and compound (II) of formula wherein R2a and R2b independently from each other are a linear alkyl group with 1 to 4 carbon atoms and R1a, R1b, R3a to R6a and R3b to R6b independently from each other are a hydrogen atom or a linear alkyl group with 1 to 4 carbon atoms.