3D Printing Powder System with Optical Brightening and Acid Control
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Solution Overview
Problem
Existing three-dimensional printing materials face challenges with low handling strength, color accuracy, and variability in performance due to high porosity and sensitivity to ambient conditions, leading to inconsistent prototype quality.
Innovation Solution
Incorporating a powder system with a water-soluble adhesive, plaster accelerator, optical brightening agent, and specific acid additives to enhance the whiteness and strength of printed parts, while controlling the cure rate of infiltrants for improved mechanical behavior and color fidelity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high porosity is used in 3D printing materials to enable color application, then color accuracy is improved, but handling strength deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters of the powder system by incorporating specific whitening agents (titanium dioxide, zinc oxide) and optical brightening agents, along with controlled plaster and adhesive ratios, to achieve optimal balance between porosity for color absorption and structural integrity for handling strength
Solution Approach 2:
The patent uses a composite powder system combining multiple materials: plaster (calcium sulfate hemihydrate), water-soluble adhesives (PVA, starch), whitening agents (titanium dioxide, zinc oxide), and optical brightening agents. This composite structure provides both the porosity needed for color application and the mechanical strength for handling
2Illumination intensity
If white pigment is loaded into powder formula to increase whiteness, then brightness is improved, but color saturation deteriorates
Solution Approach 1:
The patent applies whitening and optical brightening agents selectively to create a neutral white substrate that enhances color vibrancy without overwhelming the applied pigments. The optical brightening agent specifically targets UV absorption to create brightness that complements rather than competes with applied colors
Solution Approach 2:
The patent carefully controls the concentration parameters of whitening agents (0.1-5% titanium dioxide, 0.01-1% optical brightening agent) to achieve optimal brightness levels that do not saturate or wash out the applied colors, maintaining color gamut integrity
3Ease of operation
If ambient humidity is high during printing, then ease of operation is maintained, but performance consistency deteriorates due to infiltrant viscosity changes
Solution Approach 1:
The patent introduces acid additives (tartaric acid, citric acid, glucono delta-lactone) as intermediary substances that regulate the chemical environment during infiltrant application. These acids control the cure rate of cyanoacrylate-based infiltrants, ensuring consistent performance across varying ambient humidity conditions
Solution Approach 2:
The patent modifies the chemical parameters of the powder system by incorporating acid additives with specific pKa values (1-4) and solubility characteristics, which actively regulate the infiltrant curing process to maintain performance consistency despite environmental variations
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 results in stronger, more durable prototypes with consistent mechanical properties and improved color accuracy, enabling the creation of high-quality three-dimensional printed parts with enhanced handling strength and reduced sensitivity to environmental conditions.
Implementation Method 1
a fluid for activating the three-dimensional printing powder includes an optical brightening agent that helps to correct the white point of the powder system
Implementation Method 2
the ink-jet print head delivers a liquid binder in a predetermined pattern to the layer of powder. The binder infiltrates into gaps in the powder material and hardens to bond the powder material into a solidified layer
Implementation Method 3
The acid has a water solubility selected from a range of about 0-20 g/100 mL of water, a pKa selected from a range about 1 to about 4, and a Kow selected from a range of about −0.4 to about 1, and is adapted for modifying a cure rate of an infiltrant to facilitate penetration of the infiltrant into the article
Data Source
AI summary
A materials system and methods are provided to enable the formation of articles by three dimensional printing. The materials system includes particulate mixtures having a whitening agent and a solid particulate additive comprising an acid, the latter adapted for modifying a cure rate of an infiltrant. The materials system also includes aqueous fluids including optical brightening agents.