Curable Resin Composition Warping Control
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Solution Overview
Problem
Current photocurable resin compositions used in optical three-dimensional shaping methods face challenges with deformation issues such as warping during curing, and they lack mechanical properties like elastic modulus and impact resistance.
Innovation Solution
A curable resin composition containing a polyester resin with a specific range of (meth)acryloyl groups and selected monofunctional or difunctional (meth)acrylate compounds, such as acryloyl morpholine and dicyclopentenyl (meth)acrylate, is used, ensuring a content of 50% or more polyester resin by mass, to achieve improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radical polymerizable compound is used as the main component of the photocurable resin, then the curability is improved, but deformation such as warping occurs during curing
Solution Approach 1:
The patent uses a composite resin composition containing both radical polymerizable compounds and cationic polymerizable compounds. The radical polymerizable compound (e.g., (meth)acrylate) provides fast initial curing and low viscosity, while the cationic polymerizable compound (e.g., epoxy or vinyl cyclohexene derivative) reduces deformation and improves mechanical properties. This composite approach allows the system to achieve both good curability and reduced warping during the photopolymerization process.
2Strength
If the resin composition is optimized for mechanical properties, then the elastic modulus and impact resistance are improved, but the viscosity increases
Solution Approach 1:
The patent carefully controls the molecular weight and functional group number of the polyester resin component, and optimizes the ratio between radical and cationic polymerizable compounds. By adjusting these parameters, the resin achieves adequate mechanical properties while maintaining low enough viscosity for optical three-dimensional shaping. Specifically, the polyester resin is designed with controlled molecular weight and the functional group number is kept within specific ranges to balance viscosity and mechanical performance.
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 low viscosity and forms cured products with excellent mechanical properties, including high elastic modulus and impact resistance, suitable for optical three-dimensional shaping applications.
Implementation Method 1
selectively polymerizing and curing a curable resin composition with active energy rays, such as ultraviolet laser or the like
Data Source
AI summary
The present invention provides a curable resin composition containing a polyester resin (A) having a (meth)acryloyl group and a monofunctional (meth)acrylate compound (B1) and/or a difunctional (meth)acrylate compound (B2). The average functional group number of (meth)acryloyl groups possessed by the polyester resin (A) is within a range of 1.5 or more and 3 or less, and the content of the polyester resin (A) in the curable resin composition is 50% by mass or more. The curable resin composition has low viscosity and produces a cured product having excellent mechanical properties, and thus can be preferably used as a resin composition for optical three-dimensional shaping.