Nano-scale Magnetic Oxide Welding Aids for Plastic Composites
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Solution Overview
Problem
Current plastics welding methods in alternating electromagnetic fields face limitations due to the need for magnetically activatable welding aids, which are often expensive and have poor effectiveness, and previous solutions using nano-scale particles suffer from agglomeration issues at high temperatures.
Innovation Solution
Incorporating nano-scale, magnetic oxidic particles into plastics materials to provide weldability in alternating electromagnetic fields, ensuring they remain stable and non-agglomerated, allowing for controlled rheology and efficient energy utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If metallic inclusions are used to generate magnetic activatability in welding aids, then the plastics materials become weldable in alternating electromagnetic fields, but the production process becomes more complex and the downstream product quality deteriorates
Solution Approach 1:
The patent extracts the magnetic properties from metallic inclusions and transfers them to a separate magnetic powder component. This allows the plastics material to gain magnetic activatability without incorporating metal particles into the plastic matrix, thereby simplifying production and avoiding downstream quality issues while maintaining weldability in alternating electromagnetic fields
Solution Approach 2:
The patent introduces a magnetic powder as an intermediary substance that mediates between the alternating electromagnetic field and the plastics material. The magnetic powder absorbs electromagnetic energy and converts it to heat, enabling welding without requiring the plastics itself to be magnetically activatable or containing metallic inclusions
2Adaptability or versatility
If welding aids with particulate ferromagnetic fillers are used, then magnetic activatability is achieved, but the effectiveness factor deteriorates and cost increases
Solution Approach 1:
The patent changes the physical and chemical parameters of the magnetic component by using specifically formulated magnetic powders with controlled particle size, shape, and magnetic properties. This optimization ensures high effectiveness factors for electromagnetic field absorption and conversion, achieving reliable welding without the poor performance associated with conventional ferromagnetic fillers
Solution Approach 2:
The patent creates a composite welding aid system combining magnetic powder with appropriate binders or carriers. This composite structure enhances the overall effectiveness by ensuring uniform distribution, proper adhesion to the plastics surface, and optimized electromagnetic field interaction, thereby improving welding reliability compared to simple ferromagnetic filler applications
3Stability of the object's composition
If surface coating or surface modification is applied to nano-scale particles, then agglomeration is inhibited and dispersibility is improved, but the coating substances can be released at high temperatures causing particle agglomeration
Solution Approach 1:
The patent segments the protective function from the particle structure by using a core-shell configuration where the magnetic powder core maintains its magnetic properties while the shell provides thermal stability. This segmentation allows each component to perform its function independently - the core provides magnetic activatability while the shell prevents agglomeration at welding temperatures
Solution Approach 2:
The patent applies local quality enhancement by providing protective characteristics only where needed - specifically at the particle surfaces that are most prone to agglomeration. The surface treatment or coating is applied locally to prevent particle-particle interaction while maintaining the bulk magnetic properties and allowing controlled dispersibility in the plastics matrix
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 use of nano-scale, magnetic oxidic particles enables stable and efficient welding in alternating electromagnetic fields, overcoming agglomeration issues and allowing for independent control of rheology, resulting in effective plastics composite mouldings.
Implementation Method 1
The welding aid becomes heated via hysteresis losses and/or eddy-current losses
Implementation Method 2
The welding aid becomes heated via hysteresis losses and/or eddy-current losses
Implementation Method 3
Welding with electromagnetic radiation (induction welding) usually requires a welding aid which is magnetically activatable per se or by virtue of appropriate ingredients
Data Source
AI summary
The invention relates to plastics composite moldings obtainable via welding in an alternating electromagnetic field, in which the weld is obtained with the aid of a plastics material which comprises nano-scale, magnetic oxidic particles, which are composed of aggregated primary particles, and where the primary particles are composed of magnetic metal oxide domains whose diameter is from 2 to 100 nm in a non-magnetic metal oxide matrix or non-magnetic metalloid oxide matrix.