Photocurable Composition Balancing Thermal Resistance and Impact Strength
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Photocurable materials struggle to achieve both high thermal deformation temperature and impact resistance, as increasing one characteristic often compromises the other, resulting in cured products with low thermal deformation temperature and impact resistance, limiting their application in three-dimensional shaping methods.
Innovation Solution
A photocurable material composition comprising 50-65 parts by weight of bifunctional urethane (meth)acrylate with specific skeletal structures, 15-25 parts by weight of monofunctional adamantyl (meth)acrylate, and 10-30 parts by weight of isocyanurate derivatives, which are copolymerized to achieve a balance between thermal deformation temperature and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a material having a functional group capable of increasing the crosslinking density (such as polyfunctional acrylic or epoxy material) or a material having a bulky substituent (such as isobornyl group) is photocured, then the thermal deformation temperature of the cured product increases, but the impact resistance remarkably reduces
Solution Approach 1:
The patent changes the chemical structure parameters of the urethane (meth)acrylate component, specifically using a urethane bond-linked structure with formulas (1)-(3) that balances crosslinking density and molecular flexibility. This structural parameter change allows achieving thermal deformation temperature of 70°C or higher while maintaining impact resistance of 6 kJ/m² or higher, resolving the trade-off between these properties
Solution Approach 2:
The patent creates a composite photocurable material system combining specific ratios of urethane (meth)acrylate (50-65 parts), monofunctional adamantyl (meth)acrylate (15-25 parts), and isocyanurate derivatives (10-30 parts). This composite composition achieves synergistic effects where the urethane (meth)acrylate provides thermal resistance, the monofunctional component maintains impact resistance, and the isocyanurate derivatives enhance crosslinking without excessive brittleness
2Strength
If a material capable of reducing the crosslinking density (such as high-molecular weight acrylic or epoxy material) or a material having a rubber-like property (such as urethane) is cured, then the impact resistance is improved, but the thermal deformation temperature reduces
Solution Approach 1:
The patent optimizes the molecular weight and functional group parameters of the urethane (meth)acrylate to achieve a balance between flexibility and thermal stability. The specific structural formulas (1)-(3) with urethane bonds provide rubber-like flexibility for impact resistance while the crosslinkable groups maintain thermal deformation temperature above 70°C
Solution Approach 2:
The composite system combines urethane (meth)acrylate with isocyanurate derivatives that provide controlled crosslinking. This composite approach allows the urethane component to provide impact resistance through its flexible backbone while the isocyanurate crosslinks provide thermal stability, achieving both properties simultaneously
3Object-affected harmful factors
If the viscosity of the material is high, then bubbles are liable to be involved therein, but lowering the viscosity may compromise the mechanical characteristics of the cured product
Solution Approach 1:
The patent adjusts the viscosity parameters of the photocurable material composition to an optimal range that allows easy bubble release during curing while maintaining adequate mechanical properties in the cured product. The specific composition ratios and molecular structures achieve this balance
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 heat deflection temperature of 70°C or more and a Charpy impact strength of 6 kJ/m² or more, enabling the use of the cured product as a durable part without the need for a mold, suitable for both optical three-dimensional shaping and cast shaping methods.
Implementation Method 1
a method of three-dimensionally shaping a photocurable material based on three-dimensional data has started to be widely adopted because a target three-dimensional shaped article can be produced with satisfactory dimensional accuracy by the method without the production of any mold or the like
Data Source
AI summary
Provided are a photocurable material composition providing a cured product, which achieves both of a heat deflection temperature of 70° C. or more measured by Method A of JIS K 7191-1 and a Charpy impact strength of 6 kJ/m2 or more measured in conformity with JIS K 7111-1, after UV irradiation, and a cured product thereof. The photocurable material composition includes: 50 parts by weight to 65 parts by weight of a bifunctional urethane (meth)acrylate having (meth)acryloyl groups at both terminals thereof; 15 parts by weight to 25 parts by weight of a compound represented by the formula (4); and 10 parts by weight to 30 parts by weight of at least one of a compound represented by the formula (5) or a compound represented by the formula (6).