Composite Filler Dispersion via Rotating Surface Ligaments
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Solution Overview
Problem
Conventional methods for dispersing micro- and nano-fillers in polymer composites face limitations due to filler agglomeration, leading to restricted loading levels and altered composite properties, particularly when using nano-fillers, which increase viscosity and require energy-intensive processes and surfactants that can be costly and environmentally harmful.
Innovation Solution
A method involving a combination of mechanical and electrical forces to disperse fillers by forming ligaments on a rotating surface, where centrifugal and electrostatic forces induce shear and extensional flow deformations, breaking down agglomerations and achieving higher filler loading levels without the need for surfactants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional mechanical mixing methods are used to disperse fillers in polymer composites, then the mixing process is simple and equipment is readily available, but filler agglomeration occurs and loading levels are restricted
Solution Approach 1:
The continuous polymer stream is segmented into discrete ligaments as it passes over the rotating surface. This segmentation increases the surface area to volume ratio and allows fillers to be distributed more uniformly throughout the polymer matrix, preventing agglomeration and enabling higher loading levels.
Solution Approach 2:
The rotating surface imparts mechanical energy and vibration to the polymer-filler mixture, creating shear forces that break down filler agglomerations. The rotational motion generates dynamic mixing action that enhances filler dispersion while maintaining uniform distribution throughout the composite material.
2Stability of the object's composition
If surfactants are added to reduce surface energy and facilitate nano-filler dispersion, then filler distribution improves, but composite properties are altered and environmental harm increases
Solution Approach 1:
The invention removes surfactants from the composite formulation entirely. By using mechanical and electrical field forces for filler dispersion, the need for chemical additives is eliminated, preserving the intrinsic properties of the polymer and filler while avoiding environmental harm associated with surfactant use.
Solution Approach 2:
Conventional mechanical mixing is replaced with a combination of electrical field forces and mechanical ligament formation. This substitution uses non-contact electrical forces to achieve filler dispersion without requiring chemical surfactants, thereby avoiding property alterations and environmental issues.
3Strength
If high shear mixers and extrusion compounders are used for dispersive mixing, then mechanical mixing is effective for micro-sized fillers, but nano-sized agglomerations cannot be broken up
Solution Approach 1:
The invention changes the physical parameters of the mixing process by applying electrical field forces and creating ligament structures. This parameter change enables effective dispersion of nano-sized fillers that cannot be achieved with conventional mechanical shear mixing alone, while still maintaining effectiveness for micro-sized fillers.
Solution Approach 2:
Conventional mechanical shear mixing is supplemented and enhanced with electrical field forces. This substitution introduces a new mechanism for applying stress to filler agglomerations, enabling breakdown of nano-sized structures that are resistant to traditional mechanical mixing methods.
4Use of energy by moving object
If conventional mixing methods are used, then processing is energy efficient, but production rates are limited and filler distribution is inadequate
Solution Approach 1:
The rotating surface operates continuously to form and process ligaments, enabling continuous production of dispersed composite material. This continuous action maintains high production rates while the efficient ligament formation process ensures adequate filler distribution throughout the polymer matrix.
Solution Approach 2:
The rotational motion creates dynamic mechanical energy input that enhances mixing efficiency. This vibration and mechanical energy transfer improves both production rate and filler distribution quality simultaneously, overcoming the limitations of conventional static mixing methods.
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 well-dispersed composite materials with higher filler loading levels, improved mechanical properties, and reduced viscosity, enhancing production rates and filler distribution compared to conventional methods.
Implementation Method 1
subjecting the liquid composite mixture to a first force on a rotating surface to form liquid ligaments... wherein the first force is a mechanical force... the first force is a centrifugal force
Implementation Method 2
the at least one second force are a centrifugal force and an electrostatic force... the at least one second force imparts both shear flow deformation and extensional flow deformation to the liquid ligaments
Data Source
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AI summary
There is provided a method and system for forming a composite material. The method includes: combining a first component element with a second component element to form a composite mixture; subjecting the composite mixture to a first force to in order to form ligaments and disperse the first component element and second component element in relation to each other, wherein the first force is a mechanical force; subjecting the ligaments to at least one second force in order to form attenuated ligaments and further disperse the first component element and second component element in relation to each other, wherein the at least one second force imparts both shear flow deformation and extensional flow deformation to the ligaments to form the attenuated ligaments; and collecting the attenuated ligaments. There is also provided a composite material prepared using the method described above.