Non-Conductive EPDM Rubber Hose With Lower Stiffness
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Solution Overview
Problem
Conventional thermoplastic hoses used in boom truck hydraulics and plasma cutting tools are stiff, prone to kinking, and costly, while non-conductive thermoplastic hoses lack flexibility and kink resistance.
Innovation Solution
A non-conductive EPDM rubber hose with a composition comprising an EPDM polymer, resistive filler, silane-treated filler, and additional fillers, designed to provide lower conductivity and reduced stiffness, meeting performance requirements such as dielectric strength and insulation resistance tests, and featuring a reinforcement layer and chlorinated polyethylene cover layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermoplastic hoses are used to provide non-conductive properties, then electrical conductivity is reduced, but stiffness increases and flexibility decreases
Solution Approach 1:
The patent uses a composite material system consisting of EPDM rubber base polymer combined with specific filler materials (carbon black, silica, titania) and surfactants. This composite approach allows the hose to achieve non-conductive properties while maintaining flexibility, as the rubber matrix provides elastomeric properties while the carefully selected fillers provide electrical insulation without excessive stiffness.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the hose composition by controlling filler particle size distribution, filler loading levels, and using surfactants to modify filler-rubber interactions. These parameter changes enable optimization of both electrical insulation properties and mechanical flexibility, resolving the contradiction between non-conductivity and ease of operation.
2Ease of operation
If conventional EPDM hose is used to provide flexibility, then ease of operation improves, but electrical conductivity increases
Solution Approach 1:
The patent transforms conventional conductive EPDM hose into a non-conductive version by creating a composite material system with specific filler combinations (carbon black, silica, titania) and surfactants. This composite approach maintains the flexibility of EPDM rubber while introducing electrical insulation properties through the carefully balanced filler system.
Solution Approach 2:
The patent changes the electrical conductivity parameter of EPDM hose by controlling filler type, amount, and distribution. By adjusting these parameters and using surfactants to modify the filler-rubber interface, the hose achieves both flexibility and electrical insulation, resolving the contradiction between ease of operation and reliability.
3Reliability
If non-conductive thermoplastic hose is used to provide electrical insulation, then reliability improves, but cost increases
Solution Approach 1:
The patent optimizes the cost parameter by carefully controlling filler loading levels and using a combination of fillers with different costs and properties. By adjusting the proportions of carbon black, silica, and titania, along with using surfactants to improve filler efficiency, the patent achieves electrical insulation at reduced material costs compared to conventional thermoplastic hoses.
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 EPDM rubber hose achieves lower conductivity and reduced stiffness compared to conventional EPDM and thermoplastic hoses, passing dielectric strength and insulation resistance tests, while maintaining high burst pressure and tensile strength, making it suitable for hydraulics and coolant applications.
Implementation Method 1
a resistive filler
Implementation Method 2
a silane-treated filler
Data Source
AI summary
A non-conductive rubber hose is provided exhibiting lower conductivity compared to conventional EPDM hose, and reduced stiffness compared to conventional non-conductive thermoplastic hose. The hose is useful for applications such as in hydraulics for boom trucks, and for coolant in plasma cutting tools.