Non-Conductive EPDM Rubber Hose With Flexible Insulation
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Solution Overview
Problem
Existing non-conductive hoses for boom truck hydraulics and plasma cutting tools are either stiff, prone to kinking, or high in cost, and lack the desired flexibility and conductivity performance.
Innovation Solution
A non-conductive rubber hose with a composition comprising an EPDM polymer, a resistive filler, a silane-treated filler, and a filler activator, combined with a reinforcement layer and a CPE cover layer, which provides lower conductivity, reduced stiffness, and enhanced mechanical properties such as tensile strength and burst pressure, while passing dielectric strength and insulation resistance tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermoplastic hoses are used to achieve non-conductive properties, then electrical insulation is improved, but flexibility deteriorates and kinking resistance worsens
Solution Approach 1:
The patent uses a composite material system consisting of EPDM rubber base polymer combined with specific filler materials (carbon black, silica, or titanium dioxide) and filler activators. This composite approach allows the hose to achieve non-conductive properties while maintaining the inherent flexibility of rubber, resolving the contradiction between electrical insulation and flexibility that plagues pure thermoplastic solutions.
Solution Approach 2:
The patent optimizes the conductivity parameters by controlling filler type, filler loading (30-70 phr), and filler activator content (0.1-5 phr). By adjusting these parameters within specific ranges, the hose achieves adequate electrical insulation without excessive stiffness, allowing flexibility to be maintained while meeting non-conductive requirements.
2Reliability
If carbon black loading is increased to improve conductivity control, then electrical resistance is improved, but hose stiffness increases and flexibility deteriorates
Solution Approach 1:
The patent specifies optimal carbon black loading ranges (30-70 phr) and incorporates filler activators (0.1-5 phr) to control the electrical resistance without excessive stiffening. The filler activator modifies the filler-rubber interface, allowing adequate electrical resistance to be achieved while minimizing the adverse effect on flexibility and stiffness.
3Ease of manufacture
If thermoplastic polymers are used to achieve non-conductive properties, then cost is reduced, but stiffness increases and flexibility deteriorates
Solution Approach 1:
The patent optimizes the formulation parameters including EPDM polymer selection, filler type and loading (30-70 phr), and filler activator content (0.1-5 phr) to achieve the desired balance between cost and flexibility. By controlling these parameters, the patent provides a cost-effective rubber-based non-conductive hose that maintains flexibility, addressing the contradiction between cost reduction and flexibility preservation.
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 hose achieves improved flexibility, reduced stiffness, and higher modulus compared to prior art, while meeting performance requirements for insulation resistance and dielectric strength, ensuring reliable operation in demanding applications.
Implementation Method 1
a resistive filler. In some embodiments, the first composition further comprises a filler activator
Implementation Method 2
a silane-treated filler and an additional 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.