3D Printing Build Material with TiO2 Coating for Discoloration Control
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Solution Overview
Problem
3D printing processes using polymeric build materials often result in discoloration due to prolonged exposure to high temperatures, leading to changes in color properties such as lightness and yellowing, which affects the quality and appearance of printed objects.
Innovation Solution
A build material composition comprising composite particles of titanium dioxide partially coated with a polyether block amide polymer, which reduces discoloration and enhances the whiteness and opacity of the material, allowing the titanium dioxide to optically isolate the color of the fusing agent and maintain desired color properties in 3D objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polymeric build materials are exposed to high temperatures for prolonged periods during 3D printing, then the build material is fused and bonded together to form solid parts, but the build material undergoes discoloration and yellowing that degrades the appearance quality
Solution Approach 1:
The patent introduces titanium dioxide particles as an intermediary substance mixed with the polymeric build material. These particles act as a mediator that absorbs harmful thermal effects during printing, preventing direct thermal degradation of the polymer and thus reducing discoloration while maintaining the necessary bonding strength through the fusion process
Solution Approach 2:
The patent modifies the compositional parameters of the build material by incorporating titanium dioxide particles at specific concentrations. This parameter change alters the thermal and optical properties of the build material, enabling it to resist discoloration under high temperature exposure while maintaining fusibility for proper layer bonding
2Illumination intensity
If titanium dioxide is added to build material to reduce discoloration, then whiteness and opacity are enhanced, but the complexity of material formulation increases
Solution Approach 1:
The patent applies local quality by incorporating titanium dioxide particles specifically to address the optical property (whiteness and opacity) of the build material without requiring fundamental changes to the entire material formulation system. The titanium dioxide is added as a discrete component that locally enhances light scattering and opacity properties
Solution Approach 2:
The patent creates a composite build material system combining polymeric material with titanium dioxide particles. This composite approach leverages the complementary properties of both materials: the polymer provides structural integrity and fusibility, while the titanium dioxide provides enhanced whiteness, opacity, and thermal stability, achieving multiple functions through material composition rather than process complexity
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 use of titanium dioxide coated with polyether block amide polymer in the build material composition effectively reduces discoloration and enhances the light scattering efficiency, resulting in 3D objects with improved whiteness and opacity, while maintaining mechanical properties like strength and flexibility.
Implementation Method 1
enhances the light scattering efficiency, resulting in 3D objects with improved whiteness and opacity
Implementation Method 2
allowing the titanium dioxide to optically isolate the color of the fusing agent
Data Source
AI summary
An example of a three-dimensional (3D) printing kit includes a build material composition and a fusing agent to be applied to at least a portion of the build material composition during 3D printing. The build material composition includes composite particles of titanium dioxide at least partially coated with a polyether block amide polymer. The fusing agent includes an energy absorber to absorb electromagnetic radiation to coalesce the composite particles in the at least the portion.