Powder Composition Flow Promoter Particle Size Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for powder compositions with optimized flow and coalescence properties, as existing compositions often struggle to balance these properties, especially when using nanoparticulate flow promoters, which can adversely affect the final articles.
Innovation Solution
A powder composition comprising thermoplastic particles with a specific size range and flow promoter particles with a mean size significantly smaller than the thermoplastic particles, where the flow promoter particles are surface-treated to enhance wettability and coalescence, and their amount is optimized to provide a controlled surface area concentration, facilitating improved flow and coalescence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If nanoparticulate flow promoters are used to improve flow properties, then flowability is improved, but the properties of the final articles are adversely affected
Solution Approach 1:
The patent changes the particle size parameter of flow promoters from nanoscale to microscale (1-500 micrometers), specifically making them 50-99.99% smaller than thermoplastic particles but not nanoscale. This parameter change maintains flowability improvement while eliminating the adverse effects on final article properties that occur with nanoparticulate promoters
Solution Approach 2:
The patent applies surface treatment specifically to the flow promoter particles to modify their local surface properties. This surface treatment enhances flowability at the particle interface without requiring bulk nanoparticulate materials that would adversely affect the final article properties
2Ease of operation
If flow promoter particles are added to improve flow, then flow properties are improved, but coalescence properties become difficult to optimize
Solution Approach 1:
The patent optimizes the size ratio parameter between flow promoter particles and thermoplastic particles, specifying that flow promoters should be 50-99.99% smaller than the thermoplastic particles (with thermoplastic D50 of 10nm-1mm). This specific size relationship enables both improved flow properties and optimized coalescence, resolving the difficulty of balancing these two properties
Solution Approach 2:
The patent creates a composite powder composition system combining thermoplastic particles with surface-treated flow promoter particles in specific size relationships. This composite structure enables simultaneous optimization of both flow properties (through surface-treated promoters) and coalescence properties (through controlled size ratios), achieving what neither component could accomplish alone
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 optimized powder composition achieves enhanced flowability and coalescence, leading to improved properties in three-dimensional articles and powder coatings, with surface-treated flow promoters accelerating the coalescence process and increasing the strength of the final products.
Implementation Method 1
the flow promoter particles are surface-treated to enhance wettability and coalescence
Implementation Method 2
selective laser sintering (SLS) is a powder bed fusion process using one or more lasers to fuse powdered thermoplastic polymers into the desired three-dimensional shape
Implementation Method 3
the powder composition is applied to a surface, for example electrostatically, to form a layer
Data Source
AI summary
A powder composition includes a plurality of thermoplastic particles and a plurality of flow promoting particles having an optimized flow, coalescence, or both; and methods of preparing three-dimensional articles and methods of preparing a powder coating, and articles prepared by the methods are described herein.