Photocurable Resin Composition for 3D Shaping
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Solution Overview
Problem
Photocurable resin compositions used in optical three-dimensional shaping methods face challenges with insufficient hardness and self-shape-retaining properties, leading to issues with maintaining complex shapes due to low impact resistance and flexibility.
Innovation Solution
A photocurable resin composition incorporating a compound with two or more epoxy groups, a photoradical polymerization initiator, and a photocationic polymerization initiator, which forms an interpenetrating network structure upon curing, enhancing both hardness and toughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a photocurable resin composition with low viscosity is used to enable easy coating and complex shape formation, then the ease of manufacture and adaptability improve, but the hardness and self-shape-retaining properties of the cured product deteriorate
Solution Approach 1:
The patent uses a composite resin composition containing multiple components: a polyol compound with hydroxyl groups, a compound with carboxylic acid groups, a photopolymerization initiator, and a crosslinking agent. This composite formulation allows the uncured resin to remain low-viscosity for easy coating while the crosslinked network structure provides high hardness and shape retention in the cured state.
2Strength
If a photocurable resin composition with high flexibility is used to improve impact resistance, then the toughness improves, but the hardness and self-shape-retaining property deteriorate
Solution Approach 1:
The patent carefully controls the molecular weight and functional group ratios of the polyol compound and crosslinking agent to achieve optimal balance. By adjusting these parameters, the cured product achieves both high impact resistance (850 J/m² or higher) and sufficient hardness (95 or higher on JIS A scale) with good self-shape-retaining properties.
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 balance of high hardness and impact resistance, allowing for the successful formation of complex three-dimensional shapes with improved self-shape-retaining properties and reduced deformation under weight.
Implementation Method 1
a photoradical polymerization initiator; and a photocationic polymerization initiator
Data Source
AI summary
Provided are a photocurable resin composition that can be suitably used for an optical three-dimensional shaping method, and a cured product obtained by photocuring the composition and a three-dimensional shaped object including the cured product. The photocurable resin composition contains a compound represented by the formula (1) and a compound containing two or more epoxy groups.