Fluorine Polymer Powder Film Smoothness via Bulk Density
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Solution Overview
Problem
Fluorine-containing polymer powders produced by suspension polymerization without surfactants fail to form smooth films, and existing methods either leave environmentally harmful surfactants or result in low bulk density particles, impairing the properties of the fluorine resin film.
Innovation Solution
A fluorine-containing polymer powder with a high bulk density and low surfactant content, produced by suspension polymerization and processed in an attrition mill, which forms a smooth film without compromising the intrinsic properties of the fluorine-containing polymer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If fluorine-containing polymer powder is produced by suspension polymerization without surfactants, then environmental harm is reduced, but the film smoothness deteriorates
Solution Approach 1:
The invention changes the bulk density parameter of the polymer particles from conventional low values to specifically 0.85-1.50 g/cm³ through controlled suspension polymerization conditions. This parameter change enables particles to pack more efficiently and fuse smoothly during film formation without requiring surfactants, thus resolving the contradiction between environmental harm and film smoothness
Solution Approach 2:
The invention performs preliminary densification of polymer particles during the suspension polymerization process itself, creating particles with optimized bulk density before they are used for film formation. This preliminary action ensures that when the particles are later processed into films, they will fuse smoothly without requiring surfactant additives, thereby preventing environmental harm while ensuring film quality
2Manufacturing precision
If bulk density of fluorine-containing polymer powder is increased to form smooth films, then film smoothness is improved, but particle processing difficulty increases
Solution Approach 1:
The invention optimizes the bulk density parameter to a specific range (0.85-1.50 g/cm³) that balances film smoothness and processability. Within this range, particles are dense enough to form smooth films but not so dense that they become difficult to process, thereby resolving the contradiction between film quality and manufacturing ease
Solution Approach 2:
The invention applies partial densification rather than maximum densification, achieving sufficient bulk density for smooth film formation while avoiding excessive density that would complicate processing. This partial action approach maintains a balance between improving film smoothness and preserving ease of manufacture
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 high bulk density and low surfactant content ensure a smooth film is formed without environmental harm, maintaining the properties of the fluorine resin, suitable for various coating applications.
Implementation Method 1
heat-treating the fluorine-containing polymer particles in an atmosphere at a temperature of not lower than the melting point thereof, to melt at least a part of the powder
Implementation Method 2
polymerizing fluorine-containing ethylenic monomers by suspension polymerization to prepare fluorine-containing polymer powder
Data Source
AI summary
The present invention aims to provide a fluorine-containing polymer powder that is environmentally less harmful and forms a sufficiently smooth film without impairing the properties of the fluorine-containing polymers. The present invention relates to a fluorine-containing polymer powder including a fluorine-containing polymer prepared by suspension polymerization, which contains less than 0.1 ppm of a fluorine-containing surfactant and has an average particle size of not less than 1 µm and less than 100 µm and a bulk density of 0.90 to 1.50 g/cm3.