Urethane Acrylate 3D Printed Products with Stable Orange Color
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Solution Overview
Problem
Existing 3D printing technologies using photopolymerization-based methods face issues with colorants that cause color changes due to light exposure, leading to fading or discoloration, and compromise the curing process, especially in achieving a defined orange hue with good lightfastness and color stability.
Innovation Solution
The use of orange methine dyes with specific molecular weights and solubility in urethane acrylate resins, particularly merocyanine and styryl dyes, ensures a color difference ΔE <20 from the L*a*b* coordinates in the RAL color table, enhancing lightfastness and coloristic properties in 3D printed products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional colorants are used in photopolymerization-based 3D printing, then the curing process can proceed, but color changes and fading occur due to light exposure
Solution Approach 1:
The patent changes the chemical parameters of the colorant by selecting specific orange methine dyes with molecular weights between 50-1000 g/mol and solubility ≥0.05 g/L in urethane acrylate resin. This parameter selection ensures the dye remains stable under photopolymerization conditions while maintaining color fastness, resolving the contradiction between curing reliability and color stability
Solution Approach 2:
The patent uses a small amount of highly stable orange methine dye (0.005-5 mass parts per 20-99.995 mass parts of resin) that can withstand the photopolymerization process without degrading. This allows the colorant to function effectively throughout the curing process without being consumed or degraded, maintaining both curing reliability and color stability
2Stability of the object's composition
If polymer-soluble dyes are used to maintain transparency in amorphous plastics, then transparency is preserved, but color fastness under light exposure deteriorates
Solution Approach 1:
The patent changes the solubility parameter of the colorant by selecting orange methine dyes with specific solubility characteristics in urethane acrylate resin (≥0.05 g/L). This ensures the dye remains molecularly dissolved rather than colloidal, maintaining resin transparency while the specific chemical structure provides resistance to light-induced degradation, thus achieving both transparency and color fastness
Solution Approach 2:
The patent creates a composite system by combining urethane acrylate resin with specifically selected orange methine dyes. This composite approach allows the resin to provide the transparent matrix while the dye molecules, with their specific molecular weight and solubility characteristics, provide color fastness without compromising transparency
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 maintains a stable orange color tone with excellent lightfastness and color stability, ensuring a color difference ΔE <20 in the RAL color table, suitable for photopolymerization-based 3D printing processes like SLA and DLP.
Implementation Method 1
at least one orange methine dye having a molecular weight in the range from 50 to 1000 g/mol and a solubility in the urethane acrylate resin-based composition ≥ 0.05 g/L at 23°C
Implementation Method 2
photopolymerization-based 3D printing, in which a photocuring resin liquid is applied layer by layer and subjected to a photocuring process, i.e., polymerization, or light-induced curing, using light
Data Source
AI summary
The present invention relates to urethane acrylate resin-based 3D printed products with a color difference ΔE <20 from the L*a*b* coordinates to a color number beginning with "2" in the RAL color table, containing at least one orange methine dye dissolved therein, the use of orange methine dyes for producing 3D printed products with a color difference ΔE <20 from the L*a*b* coordinates to a color number beginning with "2" in the RAL color table by means of photopolymerization-based 3D printing, and a method for increasing the lightfastness and the coloristic properties of photopolymerizable, urethane acrylate resin-based compositions and 3D printed products to be produced therefrom with a color difference ΔE <20 from the L*a*b* coordinates to a color number beginning with "2" in the RAL color table by means of at least one orange methine dye dissolved therein.