HDPE Micropowder Grinding for Fine Particles With Low Bulk Density
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Solution Overview
Problem
Existing high molecular weight polyethylene particles with fine particle sizes face challenges in incorporation and production costs due to high bulk density, hardness, and melting point, which hinder their use in various applications such as gel extrusion processes.
Innovation Solution
The production of high density polyethylene micropowder through grinding larger particles with a multilobal shape, resulting in a median particle size of less than 15 microns and low bulk density, facilitated by crosslinking and the use of grinding aids, enhances processability and dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high molecular weight polyethylene particles are produced with fine particle sizes (less than 25 microns), then particle fineness is improved, but bulk density increases making incorporation difficult
Solution Approach 1:
The patent applies parameter changes by modifying the physical and chemical properties of polyethylene particles through controlled degradation processes. Specifically, the invention reduces molecular weight and adjusts particle morphology to achieve low bulk density (less than 0.4 g/cm³) while maintaining fine particle sizes (D50 less than 25 microns). This resolves the contradiction by changing material parameters rather than simply reducing particle size.
Solution Approach 2:
The patent creates composite characteristics by combining polyethylene particles with specific molecular weight distributions and controlled morphological features. The invention produces particles with a blend of properties: fine size distribution, low bulk density, and appropriate hardness, effectively creating a composite material profile that satisfies multiple conflicting requirements simultaneously.
2Manufacturing precision
If high molecular weight polyethylene particles are produced with fine particle sizes, then particle fineness is improved, but production cost increases
Solution Approach 1:
The patent applies preliminary action by pre-degrading the polyethylene molecules before particle formation through controlled oxidation and scission processes. This preliminary molecular modification enables subsequent particle production to achieve fine sizes at lower costs, as the material is already prepared with appropriate molecular weight and oxidative characteristics that facilitate easier processing and incorporation.
3Manufacturing precision
If high molecular weight polyethylene particles are produced with fine particle sizes, then particle fineness is improved, but hardness and melting point increase creating processing problems
Solution Approach 1:
The patent applies parameter changes by introducing controlled oxidation and molecular weight reduction to modify the physical properties of polyethylene particles. The invention specifically adjusts parameters such as oxidative stability, molecular weight distribution, and crystallinity to achieve appropriate hardness and melting points while maintaining fine particle sizes. This enables the particles to be processed in gel extrusion and sintering operations without the excessive hardness and melting point problems associated with conventional fine particles.
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 resulting micropowder offers improved mechanical properties, enhanced adhesion, and tailored properties for specific applications, reducing production costs and improving performance in energy storage devices and porous membranes.
Implementation Method 1
The micropowder can be formed by grinding high density polyethylene particles
Implementation Method 2
During grinding, it is believed that the nodes break off producing a particle size distribution in which the median particle size is very small
Data Source
AI summary
A polymer micropowder is disclosed made from a high density polyethylene polymer. In one aspect, the polymer micropowder is produced through a grinding process. The high density polyethylene particles, for instance, can initially have a multilobal shape that includes nodes that are broken off during the grinding process to produce the micropowder. The resulting polymer micropowder has a very low bulk density.