Core/Shell Powder Coating for Low-Temperature 3D Print Finishing
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Solution Overview
Problem
Current surface finishing techniques for 3D printed objects, such as mechanical polish and manual coating, are tedious, time-consuming, and not suitable for automation, and existing powder coatings require high curing temperatures that are not compatible with low-melting 3D printable materials.
Innovation Solution
Development of core/shell particles with a cross-linkable crystalline polyester resin core and a cross-linkable amorphous polyester resin shell, including a thermal initiator, that can be cured at temperatures below 150°C, enabling a low-melt powder coating suitable for electrostatic deposition and automation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional surface finishing techniques (mechanical polish, manual coating) are used, then surface smoothness is improved, but productivity is reduced and automation is not suitable
Solution Approach 1:
The patent replaces mechanical polishing and manual coating operations with a thermal curing process. Powder particles are applied to the 3D printed object and then cured using heat or UV light, transforming the surface automatically without mechanical contact or manual intervention, thereby achieving both smooth surfaces and high productivity
Solution Approach 2:
The powder particles contain embedded initiators that enable self-curing when exposed to appropriate energy (heat or UV). The coating system automatically cures itself without requiring external mechanical polishing or manual finishing operations, improving both productivity and automation capability
2Reliability
If high curing temperature powder coating is used, then coating performance is improved, but compatibility with low-melting 3D printable materials is lost
Solution Approach 1:
The patent changes the curing temperature parameter from traditional high temperatures (180-200°C) to low temperatures (below 150°C, preferably 80-120°C). This parameter change enables compatibility with low-melting 3D printable materials while maintaining coating performance through optimized powder formulation with low-melting polyester resins and appropriate initiators
Solution Approach 2:
The patent utilizes phase transitions of the polyester resin components at low temperatures. The powder contains crystalline polyester resin that melts and flows at low temperatures (below 150°C) to form a smooth coating, then solidifies upon cooling, providing both low-temperature curing capability and good coating performance
3Adaptability or versatility
If low melting temperature resin is used in powder coating, then compatibility with 3D printed materials is improved, but storage stability deteriorates
Solution Approach 1:
The patent creates a composite powder structure combining crystalline polyester resin (low melting point for compatibility) with amorphous polyester resin (high glass transition temperature for stability). This composite formulation achieves both low-temperature curing capability and excellent storage stability, as the amorphous component prevents premature softening during storage while the crystalline component enables low-temperature flow and curing
4Adaptability or versatility
If manual painting or dying is used for coloring, then color selection is improved, but productivity is reduced and automation is not suitable
Solution Approach 1:
The patent merges the coloring function with the surface coating function. Color pigments are incorporated directly into the powder coating particles, so that a single automated powder application and curing operation simultaneously provides both surface smoothing and coloration, eliminating separate manual painting or dying steps and achieving high productivity with full color selection capability
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 solution provides a fast, low-cost, and automated surface finishing method for 3D printed objects with improved storage stability and charging properties, suitable for various geometries and colors, while maintaining good curing performance.
Implementation Method 1
heating the article to a temperature of greater than 100° C. and less than 180° C. to cure the plurality of particles forming a surface coating of the 3D object
Implementation Method 2
suitable for electrostatic deposition and automation
Data Source
AI summary
The present teachings include powder coating including a plurality of core/shell particles. Each particle of plurality of core/shell particles has a size of from about 3 microns to about 100 microns. Each particle of the plurality of core/shell particles has a core including a cross-linkable crystalline polyester resin having a melting temperature of less than about 150° C. Each particle of the plurality of core/shell particles has a shell including a cross-linkable amorphous polyester resin having a glass transition temperature greater than 40° C. Each particle of the plurality of core/shell particles includes a thermal initiator.