Magnesium Compound Particles for Olefin Polymer Shape Control
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Solution Overview
Problem
Existing methods struggle to produce polyethylene-based microparticles with narrow particle size distribution and controlled shapes, particularly for ultra-high molecular weight resins, and often result in indeterminate or aggregated particles.
Innovation Solution
A method involving the controlled contact of a magnesium-containing compound solution with an organometallic compound at specific molar ratios and temperatures to produce magnesium compound particles, which are then used as carriers for olefin polymerization, allowing the formation of olefin polymer particles with either uneven or smooth surfaces within precise size ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical grinding is used to produce polyethylene microparticles, then particle production is achieved, but the particle shape becomes indeterminate and particle size distribution widens
Solution Approach 1:
The invention changes the fundamental parameter of particle formation from mechanical pulverization to controlled polymerization. By adjusting polymerization parameters (catalyst type, temperature, pressure, monomer concentration), the process produces particles with uniform size distribution (standard deviation ≤ 3 μm) and controlled shapes, resolving the precision issue while maintaining productivity
Solution Approach 2:
The invention utilizes phase transition of polyethylene from solid to liquid state during polymerization, allowing particles to form and solidify into spherical shapes with smooth surfaces. This phase transition mechanism enables precise control over particle morphology that mechanical grinding cannot achieve
2Shape
If spraying is used to produce polyethylene microparticles, then spherical particles are formed, but aggregation occurs and particle size distribution widens
Solution Approach 1:
The invention introduces a catalyst system as an intermediary that controls particle formation during polymerization. The catalyst particles act as nuclei around which polymer grows uniformly, preventing aggregation while maintaining spherical shape. This intermediary mechanism ensures both sphericity and narrow size distribution
Solution Approach 2:
The invention replaces the mechanical spraying system with a chemical polymerization system. Instead of mechanically atomizing molten polymer and relying on surface tension, the process uses controlled chemical reactions to build particles from monomers, achieving spherical shapes through isotropic growth rather than mechanical forces
3Shape
If emulsification is used to produce polyethylene microparticles, then spherical particles with fewer aggregates are obtained, but particle size distribution widens for high molecular weight resins
Solution Approach 1:
The invention changes the emulsification parameters by using specific catalyst systems and controlling polymerization temperature and pressure. This allows uniform particle growth even for ultra-high molecular weight polyethylene, maintaining narrow size distribution (standard deviation ≤ 3 μm) while preserving spherical shape
4Productivity
If conventional polymerization methods are used, then polyethylene microparticles are produced, but shape control is difficult
Solution Approach 1:
The invention uses a catalyst system as an intermediary that directs particle morphology development. By selecting specific catalysts (Ziegler-Natta, metallocene, or post-metallocene) and controlling their concentration and distribution, the process achieves shape control (spherical, hollow, or irregular) while maintaining high polymer production efficiency
Solution Approach 2:
The invention applies local quality control by creating different microenvironments within the polymerization system. By controlling catalyst distribution, temperature gradients, and monomer concentration locally, the process produces particles with specific shapes and internal structures tailored to application requirements
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 enables the stable production of olefin polymer particles with desired surface characteristics and narrow particle size distribution, enhancing flowability and suitability for various applications.
Implementation Method 1
bringing a magnesium-containing compound solution (A) comprising (A-1) a magnesium-containing compound and (A-2) a compound comprising an element selected from elements in Group 15 and Group 16 of the periodic table, and (B) an organometallic compound comprising a metal element (MB), excluding magnesium, selected from elements in Group 1, Group 2, and Group 13 of the periodic table into contact with each other in a temperature range of -20 to 10°C
Implementation Method 2
a method for producing a magnesium compound particle useful for production of an olefin-based polymer particle
Data Source
Figure 1~2
Figure 3~4
AI summary
[Problem] An object of the present invention is to provide a method for producing a particle useful for the production of an olefin-based polymer microparticle having an uneven shape on the surface thereof, the particle including a magnesium atom and a specific metal atom and having a small average particle size. [Solution] A magnesium-containing compound liquid and an organometallic compound containing a specific metal atom are brought into contact with each other under specific conditions to produce a particle having a specific average particle size that contains a magnesium atom and the specific metal atom at a specific ratio. With the above particle size and atom ratio, the particle obtained is useful to produce an olefin-based polymer microparticle having an uneven shape on the surface thereof.