Curable Resin Composition Toughness Modulus Balance
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Solution Overview
Problem
Existing curable resin compositions for three-dimensional shaping face challenges in achieving a balance between toughness and modulus of elasticity, as increasing toughness typically results in a decrease in modulus of elasticity, making them insufficient for rapid prototyping or rapid manufacturing applications.
Innovation Solution
A curable resin composition is developed, comprising a curable resin represented by a specific General Formula, a polyhydric alcohol with 2 to 5 hydroxyl groups, and a curing agent, along with an oxetane compound, to enhance toughness and modulus of elasticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polyhydric alcohol is added to increase toughness, then toughness is improved, but modulus of elasticity is lowered
Solution Approach 1:
The invention changes the chemical structure parameters of the curable resin by specifying particular structural features (aromatic rings, specific linking groups, oxetane groups) to achieve a balance between toughness and modulus of elasticity that cannot be obtained by simple additive approaches
Solution Approach 2:
The invention creates a composite resin system combining multiple functional groups (epoxy, oxetane, aromatic rings, polyhydric alcohol) within a single resin molecule to achieve synergistic effects that simultaneously improve both toughness and modulus of elasticity
2Strength
If toughness of the resin composition is increased, then fracture toughness is improved, but modulus of elasticity is lowered
Solution Approach 1:
The invention modifies the molecular parameters of the curable resin including the number of aromatic rings (1-3), the structure of linking groups (L1-L4), and the presence of oxetane groups to achieve optimal balance between fracture toughness and modulus of elasticity
Solution Approach 2:
The resin molecule is segmented into distinct functional regions (aromatic rings for rigidity, flexible linking groups for toughness, oxetane groups for crosslinking) that work together to balance mechanical 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 cured product with excellent toughness and modulus of elasticity, making it suitable for three-dimensional shaping applications such as rapid prototyping and rapid manufacturing.
Implementation Method 1
A method of optically forming a three-dimensional shaped article by curing a liquid curable resin by layer by energy-active light such as an ultraviolet ray
Data Source
AI summary
A curable resin composition includes (A) a specific curable resin and (C) a curing agent, and further includes (BI) 0.1 parts by mass or more and 20 parts by mass or less of a polyhydric alcohol having 2 to 5 hydroxyl groups, based on based on 100 parts by mass of the curable resin (A); (BII) a cyclic compound having 3 to 6 reactive groups and a reactive group equivalent of 100 g/eq or more and 300 g/eq or less; or (BIII) a specific oxetane compound in a mass ratio of the curable resin (A) to the oxetane compound (BIII) being 5:5 to 9:1.