Flame-Retardant Magnetic Wire Composition for Strong Pull and Flexibility
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Solution Overview
Problem
Existing magnetic wires lack effective flame retardancy, especially halogen-free low-smoke flame retardancy, and struggle to balance magnetic attraction force and mechanical properties, failing to meet safety and environmental standards.
Innovation Solution
A method for preparing a flame-retardant magnetic wire with a core, a middle sheath layer, and an optional outer sheath layer, using a combination of rare earth iron nitrogen magnet powder, ferrite magnet powder, and halogen-free flame retardants, oriented by a magnetic field during extrusion, and magnetized to achieve high magnetic attraction and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flame retardant additives are added to the magnetic layer, then flame retardant properties are improved, but magnetic attraction force deteriorates
Solution Approach 1:
The patent uses a composite material system consisting of rare earth iron nitrogen magnet powder (providing magnetic properties), ferrite magnet powder (providing both magnetic and flame retardant properties), and polymer binder. This composite approach allows the magnetic layer to simultaneously achieve flame retardancy and maintain magnetic attraction force without relying on separate flame retardant additives that would interfere with magnetic properties.
2Reliability
If too much flame retardant is added to the magnetic layer, then flame retardant properties are improved, but mechanical properties deteriorate
Solution Approach 1:
The patent employs a composite material formulation where ferrite magnet powder serves dual functions as both magnetic filler and flame retardant agent. The polymer binder matrix (using materials like TPU, TPEE, or TPV) provides mechanical strength and flexibility. This composite structure achieves flame retardancy without compromising mechanical properties, as the flame retardant function is integrated into the magnetic filler rather than added as a separate component that would weaken the material.
3Force
If anisotropic samarium iron nitrogen magnet powder with D50 > 3 μm is used, then magnetic properties are improved, but mechanical properties deteriorate
Solution Approach 1:
The patent specifies a precise particle size parameter range for anisotropic samarium iron nitrogen magnet powder with D50 of 1-3 μm. This parameter optimization ensures that the magnetic powder particles are small enough to maintain good mechanical properties and bonding with the polymer matrix, while still providing sufficient magnetic properties. The controlled particle size prevents aggregation and ensures uniform distribution, maintaining both mechanical integrity and magnetic performance.
Solution Approach 2:
The patent combines anisotropic samarium iron nitrogen magnet powder (D50: 1-3 μm) with ferrite magnet powder in a composite system. This combination allows the use of finer rare earth magnet powder (which would otherwise have poor mechanical properties at small sizes) while the ferrite powder provides structural support and flame retardancy, achieving a balance between magnetic properties and mechanical strength.
4Object-affected harmful factors
If halogen-free flame retardants are used, then environmental protection is improved, but flame retardant effectiveness deteriorates
Solution Approach 1:
The patent uses ferrite magnet powder as an intrinsic flame retardant component within the composite material system. Ferrite provides effective flame retardancy through its high decomposition temperature and ability to form protective char layers, while being inherently halogen-free and environmentally friendly. This approach eliminates the need for separate halogen-free flame retardant additives, achieving both environmental protection and effective flame retardancy through the composite material design.
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 method produces a wire with excellent flame retardant properties, high magnetic attraction, and good mechanical properties, meeting safety and environmental standards, while maintaining flexibility and convenience in storage.
Implementation Method 1
a magnetic field is generated in its orientation and/or magnetization direction, thereby generating a magnetic attraction force between opposite poles
Implementation Method 2
a flexible bonded magnet is prepared by magnetic materials and polymer compounds such as elastomer materials
Implementation Method 3
oriented by a magnetic field during extrusion
Data Source
AI summary
A method for preparing a flame-retardant magnetic wire and the wire are provided. The material for flame-retardant magnetic layer is obtained by compounding rare earth iron nitrogen (R—Fe—N) magnet powder with ferrite magnet powder and adding an elastic substrate and a flame retardant. The core and the material for flame-retardant magnetic layer are co-extruded and shaped, and the wire is obtained after magnetization. The wire preparation solution with the least addition of flame retardant, the highest magnetic attraction performance and the best mechanical properties can be realized. The prepared wire has good flexibility, good tear resistance and tensile properties.