Branched Polyethylene EPM EPDM Rubber Composition for Strength
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Solution Overview
Problem
Ethylene propylene rubber products, particularly those using peroxide vulcanization, suffer from weaker tensile and tear strength compared to sulfur vulcanization, which compromises their aging resistance and mechanical properties, making them more prone to damage during use.
Innovation Solution
A rubber composition incorporating branched polyethylene with a degree of branching of not less than 50 branches/1000 carbon atoms, combined with EPM and EPDM, and reinforced with carbon black and silica, to enhance crosslinking properties and mechanical strength while maintaining good aging resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If peroxide vulcanization is used for ethylene propylene rubber to obtain better aging resistance and high temperature resistance, then aging resistance is improved, but tensile strength and tear strength become weaker
Solution Approach 1:
The patent uses a composite rubber matrix comprising both EPM and EPDM in specific proportions (EPM: 30-70 parts, EPDM: 70-30 parts). This composite structure combines the excellent aging resistance of EPM with the good processability and crosslinking properties of EPDM, resolving the contradiction between aging resistance and mechanical strength in peroxide vulcanized rubber products.
Solution Approach 2:
The patent specifies precise compositional parameters and ratios of the rubber matrix components, along with controlled vulcanization conditions (temperature, time, peroxide dosage). By optimizing these parameters, the patent achieves both high aging resistance and improved tensile/tear strength in peroxide vulcanized products.
2Reliability
If EPM is used to improve aging resistance due to its saturated molecular chain, then aging resistance is improved, but mechanical strength decreases
Solution Approach 1:
The patent creates a composite rubber matrix by combining EPM and EPDM in specific ratios. EPM provides the saturated molecular chain structure for excellent aging resistance, while EPDM contributes double bond sites for effective peroxide crosslinking and good mechanical properties. This composite approach resolves the contradiction between aging resistance and mechanical strength.
Solution Approach 2:
The patent assigns different functional roles to different components: EPM primarily provides aging resistance through its saturated structure, while EPDM provides crosslinking sites and mechanical strength. This functional differentiation allows each component to excel at its specific function while contributing to overall performance.
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 improved tensile and tear strength, compression set resistance, and mechanical properties, effectively addressing the weaknesses of peroxide vulcanized ethylene propylene rubber products.
Implementation Method 1
the peroxide crosslinking properties of the rubber matrix are improved
Implementation Method 2
The reinforcing and filling systems using both silica and carbon black
Data Source
AI summary
The present invention discloses a rubber composition, production method thereof and a rubber product using the same. The rubber composition includes a rubber matrix and essential components. Based on 100 parts by weight of the rubber matrix, the rubber matrix includes a branched polyethylene with a content represented as A, in which 0<A≤100, and an EPM and an EPDM with a total content represented as B, in which 0≤B<100; and the essential components include 1.5 to 10 parts of a crosslinking agent and 40 to 200 parts of a reinforcing filler. The reinforcing filler includes carbon black and silica and can also include any one or more of calcium carbonate, talcum powder, calcined clay, magnesium silicate, and magnesium carbonate, wherein the content of the carbon black is 5 to 100 parts, and the content of the silica is 5 to 60 parts. The rubber composition is used for producing rubber product with better yield and tear strength and service performance. The rubber product include high-strength insulation compound for preparing wire and cable, waterproof coil, and high-temperature resistant conveyor belt.