EPDM Blend Composition for Multilayer Building Tack Retention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ethylene propylene diene copolymer compounds lack sufficient building tack, limiting their use in multi-layer articles such as V-belts and hoses due to insufficient adhesion before vulcanization, while traditional tackifiers compromise physical properties and heat resistance.
Innovation Solution
A multilayer structure comprising a blend of two ethylene propylene diene copolymers with varying ethylene content and heat of fusion, combined with fillers and a curing agent, enhances building tack without compromising green strength or heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional tackifiers are added to enhance building tack, then adhesion improves, but physical properties and heat resistance deteriorate
Solution Approach 1:
The invention changes the chemical composition parameters of the rubber compound by incorporating specific ratios of polar polymers (5-50 phr) and hydrogenated petroleum resins (5-40 phr) into the ethylene propylene diene copolymer matrix. This parameter modification enables the compound to achieve sufficient building tack (greater than 20% increase) while maintaining physical properties and heat resistance, resolving the contradiction between adhesion enhancement and property preservation
Solution Approach 2:
The invention creates a composite rubber compound system by combining ethylene propylene diene copolymer with polar polymers (such as polychloroprene or nitrile rubber) and hydrogenated petroleum resins. This composite approach allows the compound to exhibit both improved building tack for better layer adhesion and maintained thermal stability, overcoming the limitations of single-component systems
2Reliability
If ethylene propylene diene copolymer is used for thermal and ozone stability, then environmental resistance improves, but building tack deteriorates
Solution Approach 1:
The invention modifies the compound formulation by adding polar polymers at 5-50 phr and hydrogenated petroleum resins at 5-40 phr to the ethylene propylene diene copolymer base. This parameter change introduces polar interactions that enhance building tack while the base copolymer maintains thermal and ozone stability, resolving the contradiction between environmental resistance and adhesion
Data Source
AI summary
A multilayer structure can include at least one layer that comprises an ethylene propylene diene copolymer compound that comprises: 60 parts per hundred rubber (phr) to 95 phr of a first ethylene propylene diene copolymer (EP(D)M) having an ethylene content of 62 wt % to 90 wt % based on the first EP(D)M and a heat of fusion (Hf) of 15 J/g or greater; 5 phr to 40 phr of an second EP(D)M having an ethylene content of 40 wt % to 60 wt % based on the second EP(D)M and a Hf of 0 J/g to 14 J/g, wherein the Hf of the first EP(D)M minus the Hf of the second EP(D)M is 5 J/g or greater; wherein the first EP(D)M and second EP(D)M combined are 100 parts; a filler at 40 phr to 500 phr; and a curing agent at 0.5 phr to 20 phr.