Optical 3D Printing Resin With Low Viscosity and High Heat Deflection
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Solution Overview
Problem
Existing crosslinkable formulations are not suitable for 3D printing of optical objects due to unsatisfactory viscosity, heat deflection temperature, and refractive index requirements, which are crucial for optical applications.
Innovation Solution
A crosslinkable composition comprising biphenolfluorene diglycidyl ether tetra(meth)acrylate, mono(meth)acrylates of monoalcohols with biphenyl or benzyl structures, and optional urethane or thiocarbamate (meth)acrylates, along with other components, to achieve low viscosity, high heat deflection temperature, and high refractive index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional crosslinkable formulations are used, then crosslinking capability is achieved, but viscosity is too high for 3D printing
Solution Approach 1:
The patent changes the chemical parameters of the formulation by using specific low-viscosity monomers (benzyl methacrylate, phenylbenzyl methacrylate) and controlling the functional group composition to achieve both low viscosity and effective crosslinking capability suitable for 3D printing
Solution Approach 2:
The formulation combines multiple components including epoxy (meth)acrylates, (meth)acrylate oligomers, and monomers in specific ratios to create a composite system that balances流动性 (low viscosity) with crosslinking performance
2Illumination intensity
If high refractive index materials are used, then optical performance is improved, but heat deflection temperature decreases
Solution Approach 1:
The patent optimizes the chemical composition parameters by selecting specific high-refractive-index monomers and controlling their ratios to achieve refractive index ≥1.47 while maintaining heat deflection temperature ≥70°C through proper crosslinking density
Solution Approach 2:
The formulation uses a composite system of epoxy (meth)acrylates and (meth)acrylate oligomers that provide both high refractive index and thermal stability, creating a material that satisfies both optical and thermal requirements
3Ease of operation
If viscosity is reduced for 3D printing, then printability is improved, but mechanical strength decreases
Solution Approach 1:
The patent adjusts the molecular weight and functional group parameters of the monomers and oligomers to achieve low viscosity for printability while the crosslinking reaction creates a strong three-dimensional network for mechanical strength
Solution Approach 2:
The composite formulation includes epoxy (meth)acrylates and (meth)acrylate oligomers that form an extensive crosslinked network, providing high mechanical strength (Young's modulus ≥2500 MPa) despite low initial viscosity
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 achieves a viscosity below 2500 mPa·s, a heat deflection temperature of at least 80°C, and a refractive index of 1.57, making it suitable for 3D printing of optical objects with enhanced optical properties.
Implementation Method 1
crosslinkable, in particular photocrosslinkable, composition
Implementation Method 2
a heat deflection temperature (HOT) according to the ISO 075 (2004) method after crosslinking of at least 70° C.
Data Source
AI summary
The invention relates to a crosslinkable composition which comprises a component a) at least one bisphenolfluoroene diglycidyl ether tetra(meth)acrylate, a component b) at least one diluent from the mono(meth)acrylates of a monoalcohol comprising a biphenyl, cumyl or benzyl structure, and at least one optional component from components c), d) and e). It also relates to its use for coatings or materials, in particular for 3D printed articles for optical applications, as it also relates to the crosslinked composition and to the finished product, in particular the 3D article which results therefrom.