Nitrile Rubber Composition for Cold-Resistant Vehicle Components
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Solution Overview
Problem
Low-content nitrile rubber exhibits poor processability and slow vulcanization rates, which hinders its application in cold-resistant vehicle components and other demanding environments.
Innovation Solution
Nitrile rubber with 18 to 32 parts by weight of α,β-unsaturated nitrile monomer and 82 to 68 parts by weight of conjugated diene monomer, emulsion polymerized in the presence of fatty acid, alkyl thiol, and oil-soluble peroxide, with controlled addition of monomers during polymerization to enhance polymerization and vulcanization rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If low-content nitrile rubber is used to improve cold-resistance, then cold-resistance is improved, but processability deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of nitrile rubber by incorporating specific amounts of acrylonitrile (15-30 wt%) and methacrylonitrile (0.1-5 wt%), along with controlled diene monomer content (65-80 wt%), to achieve optimal balance between cold-resistance and processability. This parameter optimization allows the rubber to maintain flexibility at low temperatures while improving manufacturing characteristics
2Temperature
If low-content nitrile rubber is used to improve cold-resistance, then cold-resistance is improved, but vulcanization rate deteriorates
Solution Approach 1:
The invention creates a composite rubber system combining nitrile rubber with specific diene rubber components (65-80 wt% butadiene or isoprene), which introduces more reactive double bonds that accelerate vulcanization. This composite structure maintains the cold-resistance properties of low-acrylonitrile content rubber while the diene component provides faster curing kinetics
Solution Approach 2:
By adjusting the acrylonitrile content to 15-30 wt% (lower than conventional rubber) and adding 0.1-5 wt% methacrylonitrile, the invention modifies the chemical reactivity parameters to enable faster vulcanization while preserving cold-resistance characteristics
3Object-affected harmful factors
If high acrylonitrile content is used to improve oil resistance, then oil resistance is improved, but cold-resistance deteriorates
Solution Approach 1:
The invention optimizes the acrylonitrile content parameter to a moderate range of 15-30 wt%, avoiding both excessive and insufficient levels. This balanced parameter setting provides adequate oil resistance through nitrile group polarity while preventing the rubber from becoming too stiff and losing cold-resistance capabilities
Solution Approach 2:
The invention creates a composite system combining nitrile rubber segments (providing oil resistance) with diene rubber segments (providing flexibility and cold-resistance). This composite structure allows each component to contribute its advantageous properties, achieving both oil and cold resistance simultaneously
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 approach results in nitrile rubber with improved polymerization and vulcanization rates, superior mechanical properties, and enhanced processability, suitable for cold-resistant applications.
Implementation Method 1
emulsion polymerized in the presence of fatty acid, alkyl thiol, and oil-soluble peroxide
Implementation Method 2
emulsion polymerized in the presence of fatty acid, alkyl thiol, and oil-soluble peroxide
Data Source
AI summary
Disclosed are nitrile rubber and a method of preparing the same. The nitrile rubber contributing to an excellent polymerization rate and vulcanization rate and having advantageous processability during vulcanization, and a method of preparing the same are disclosed.