Conductive Polymer Compounding by Solid-State 3D Printing
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Solution Overview
Problem
Current methods for creating conductive plastic compositions face challenges such as high costs due to expensive conductive fillers, poor dispersion of fillers, and the need for high loading levels, which can compromise mechanical properties and processability. Additionally, existing plastics recycling technologies are inefficient and often require sorting and high temperatures, making them costly and environmentally unfriendly.
Innovation Solution
The use of solid-state additive manufacturing technology for in situ mixing and deposition of conductive fillers into thermoplastic polymers, allowing for the creation of conductive polymer compositions and 3D objects while incorporating plastic waste. This method generates severe plastic deformation, achieving good dispersion and conductivity without the need for high temperatures or sorting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mixing methods are used to create conductive plastic compositions, then conductive fillers can be dispersed in the polymer matrix, but the dispersion quality is poor and high loading levels are required which compromise mechanical properties and processability
Solution Approach 1:
The patent replaces conventional high-shear mixing mechanisms with friction stir processing, a solid-state additive manufacturing technique that uses controlled friction and mechanical deformation to achieve superior filler dispersion at lower loading levels, thereby maintaining mechanical properties while improving electrical conductivity
Solution Approach 2:
The invention changes the processing parameters from high-temperature melting and high-shear mixing to solid-state friction stir processing with controlled temperature and deformation, enabling better dispersion of conductive fillers without requiring high loading levels that would compromise mechanical strength
2Reliability
If high loading levels of conductive fillers are used to achieve good conductivity, then electrical conductivity improves, but mechanical properties and processability are compromised
Solution Approach 1:
The patent substitutes traditional high-loading compounding methods with friction stir processing that achieves effective conductivity at lower filler loadings through superior dispersion, thereby maintaining processability and ease of manufacture
Solution Approach 2:
The invention creates optimized composite materials with reduced filler loading by improving the interface between filler and matrix through friction stir processing, resulting in composites that maintain both electrical conductivity and processability
3Loss of substance
If existing plastics recycling technologies are used, then plastic waste can be recycled, but the process requires sorting and high temperatures making it costly and environmentally unfriendly
Solution Approach 1:
The patent replaces thermal recycling methods requiring high temperatures with solid-state friction stir processing that recycles plastic waste at ambient or low temperatures, significantly reducing energy consumption and environmental impact
Solution Approach 2:
The invention creates a multi-functional friction stir processing system that can handle mixed plastic waste without pre-sorting, combining recycling, mixing, and processing capabilities in a single operation, thereby reducing costs and simplifying the recycling process
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
This approach results in cost-effective fabrication of conductive plastic compositions and 3D objects with improved electrical and thermal conductivity, while also enabling efficient recycling of plastic waste into valuable 3D printed products, thus addressing both the challenges of conductive plastic production and plastics recycling.
Implementation Method 1
generating severe plastic deformation of the filler material by applying normal, shear and/or frictional forces
Implementation Method 2
applying normal, shear and/or frictional forces by way of a rotating shoulder of the tool
Implementation Method 3
Conductive plastic compounds, unlike insulating plastics, have the ability to conduct electricity. When grounded, conductive plastics remain in zero potential as they do not accumulate static electricity
Implementation Method 4
solid-state additive manufacturing methods for compounding conductive polymer compositions
Data Source
AI summary
Solid-state additive manufacturing methods for compounding conductive plastic compositions, fabrication of conductive plastic parts and conductive coatings, and plastic recycling are disclosed. Electrically conductive or thermally conductive plastic compositions are compounded and subsequently printed with the solid-state additive manufacturing system. The solid-state fabricated compositions, parts and coatings can also be manufactured to be both thermally and electrically conductive. Solid-state plastic waste recycling methods are also disclosed where various plastic waste materials and shapes are solid-state processed. The plastic waste can be mixed with virgin plastic material or mixed with other types of materials such as metals, ceramics or their combination. The waste plastic feedstock is reinforced with different types of reinforcing particles or fibers, or various additives are added for improving properties of the final deposits.