Halogenated Polyethylene Belt Blend for Heat and Oil Resistance
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Solution Overview
Problem
Existing materials for synchronous belts lack adequate temperature resistance, oil resistance, flexibility at low temperatures, and structural integrity, particularly in automotive and industrial applications.
Innovation Solution
A rubber composition comprising a polymer blend of halogenated polyethylene and ethylene polymers, including chlorinated polyethylene rubber, ethylene acrylic elastomer, or EPDM rubber, with additives like organic peroxide or accelerators, providing improved temperature resistance, oil resistance, flexibility down to -40°C, and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HNBR is used for synchronous belts, then temperature resistance and oil resistance are improved, but the amount of reinforcing material required increases
Solution Approach 1:
The patent uses a composite material system combining halogenated polyethylene (25-50 wt.-%) with non-halogenated ethylene polymer (50-75 wt.-%) to achieve the required temperature and oil resistance. This composite approach allows the rubber composition to meet performance requirements while reducing dependence on reinforcing materials like carbon black
Solution Approach 2:
The patent changes the chemical composition parameters by introducing halogenated polyethylene with specific halogen content (0.5-3.0 mmol/g) and molecular weight characteristics. These parameter changes enable the material to achieve superior adhesion strength and structural integrity without requiring excessive reinforcing materials
2Strength
If halogenated polyethylene is used in the blend, then adhesion strength and temperature resistance are improved, but the complexity of material selection increases
Solution Approach 1:
The patent specifies precise parameter ranges for halogenated polyethylene including halogen content (0.5-3.0 mmol/g), molecular weight (10,000-500,000 g/mol), and composition ratio (25-50 wt.-%). These defined parameters simplify material selection by providing clear selection criteria while achieving the required adhesion strength and temperature resistance
Solution Approach 2:
The halogenated polyethylene acts as an intermediary component that enhances adhesion between the rubber matrix and reinforcing materials. Its specific chemical structure with halogen groups facilitates better bonding, thereby improving overall adhesion strength without requiring additional complex material systems
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 achieves superior adhesion strength, tensile strength, and retention of physical properties at high temperatures, with reduced carbon black usage, maintaining flexibility and resistance to oil and ozone, suitable for synchronous belts.
Implementation Method 1
The composition can include an organic peroxide or other accelerator
Data Source
AI summary
A rubber composition having a blend of ethylene polymers, particularly halogenated and non-halogenated ethylene polymer. The composition has the halogenated ethylene as 25-50 wt.-% of the total composition. In some embodiments, the non-halogenated ethylene polymer is an ethylene acrylic elastomer. The composition can include an organic peroxide or other accelerator. The rubber composition is useful for synchronous belts having moderate to high temperature resistance, good fuel resistance, flexibility down to −40° C. and high structural integrity. Additionally, the rubber composition allows reduction in the amount of fossil fuel derived reinforcing materials such as carbon black.