Model Material Clear Composition Suppressing Yellowness
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Solution Overview
Problem
Current model material compositions for material-jet optical shaping processes face challenges in achieving high transparency and reduced yellowness, as they tend to undergo color change during photocuring, necessitating further improvement in transparency and suppression of yellowness.
Innovation Solution
A model material clear composition is developed, comprising an ethylenically unsaturated monomer with a dicyclopentenyl or dicyclopentanyl group, an aliphatic cyclic structure urethane group, and another aliphatic cyclic structure monomer without urethane or amide groups, along with a photopolymerization initiator, to minimize yellowing and enhance transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photocurable resin compositions are used for material-jet optical shaping, then the shaping process can be performed, but the cured product exhibits yellowing and reduced transparency
Solution Approach 1:
The invention changes the chemical composition parameters of the photocurable resin by specifying precise proportions of different monomers (caprolactone-modified polyethylene glycol di(meth)acrylate at 5-50 wt%, cycloaliphatic polyol di(meth)acrylate at 10-50 wt%, and monofunctional (meth)acrylate at 20-70 wt%). This compositional parameter optimization suppresses yellowing while maintaining transparency and curability.
Solution Approach 2:
The invention uses a composite resin system combining multiple types of ethylenically unsaturated compounds with different functional groups and molecular structures. This composite approach leverages the advantages of each component: caprolactone-modified PEG diacrylate for flexibility and transparency, cycloaliphatic polyol diacrylate for structural stability and low yellowing, and monofunctional (meth)acrylate for curability. The synergistic combination achieves superior optical properties.
2Object-generated harmful factors
If the content of nitrogen atom-containing ethylenically unsaturated monomer is reduced, then yellowing is suppressed, but mechanical properties and curability may be compromised
Solution Approach 1:
The invention optimizes the nitrogen-containing monomer content to 0-20 wt% of the total composition, balancing yellowing suppression with mechanical property maintenance. This parameter optimization ensures sufficient curability and mechanical strength while minimizing yellowing effects.
Solution Approach 2:
The invention assigns different functional roles to different components: nitrogen-containing monomers (0-20 wt%) provide curability and mechanical strength where needed, while the majority composition (80-100 wt%) consists of low-yellowing monomers that provide optical clarity. This local quality differentiation allows each component to excel at its primary function.
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 composition effectively suppresses yellowing and improves transparency, resulting in a model material with superior appearance characteristics and well-balanced mechanical properties.
Implementation Method 1
irradiating a photocurable resin composition with light such as ultraviolet ray to form cured layers
Data Source
AI summary
The present invention provides a model material clear composition to be used in a material-jet optical shaping process, comprising an ethylenically unsaturated compound (A) and a photopolymerization initiator, wherein the ethylenically unsaturated compound (A) comprises:an ethylenically unsaturated monomer (A1) having a dicyclopentenyl group and/or a dicyclopentanyl group;an ethylenically unsaturated compound (A2) having an aliphatic cyclic structure in a molecule and having a urethane group; andan ethylenically unsaturated monomer (A3) having an aliphatic cyclic structure in a molecule and having neither a urethane group nor an amide group (excluding the ethylenically unsaturated monomer (A1)), and whereina total mass of the ethylenically unsaturated monomer (A1), the ethylenically unsaturated compound (A2), and the ethylenically unsaturated monomer (A3) is 60% by mass or more based on the total mass of the ethylenically unsaturated compound (A).