Stereolithography Curable Composition Cracking Suppression
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Solution Overview
Problem
In evaporative pattern casting, stereolithographic articles face cracking issues due to rapid temperature increases, which can be mitigated by controlling the temperature rise but at the cost of reduced productivity.
Innovation Solution
A curable composition for stereolithography comprising a photopolymerizable component with a (meth)acrylic monomer at 80% by mass, including difunctional and monofunctional (meth)acrylic monomers, and a photopolymerization initiator, resulting in a cured product with a storage elastic modulus range that minimizes stress from volume expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the temperature is rapidly increased to eliminate the cured product, then productivity is improved, but cracking of the material around the cured product occurs due to volume expansion
Solution Approach 1:
The invention changes the chemical composition parameters of the curable composition, specifically using a photopolymerizable component comprising 80% by mass or more of (meth)acrylic monomer with a specific molecular weight range (0.06 to 0.6 mmol/g), which results in a cured product with controlled volume expansion characteristics that suppresses cracking during rapid heating
Solution Approach 2:
The invention uses a composite photopolymerizable system combining specific (meth)acrylic monomers with controlled molecular weights and functionalities, creating a cured product with optimized thermal expansion properties that allows rapid heating without causing surrounding material cracking
2Reliability
If the temperature is increased moderately to suppress volume expansion and cracking, then reliability is improved, but productivity is reduced due to extended casting time
Solution Approach 1:
The invention optimizes the photopolymerizable component parameters (80%+ (meth)acrylic monomer content, specific molecular weight 0.06-0.6 mmol/g) to achieve a cured product that suppresses cracking even during rapid temperature increase, eliminating the need for moderate heating and thereby maintaining high productivity
3Speed
If the cured product volume expands during heating, then elimination is accelerated, but cracking of the surrounding material occurs
Solution Approach 1:
The invention controls the volume expansion characteristics of the cured product by adjusting the photopolymerizable component parameters, specifically using (meth)acrylic monomers with molecular weights of 0.06 to 0.6 mmol/g, which provides controlled expansion that enables rapid elimination without causing surrounding material cracking
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 effectively suppresses cracking of materials around the cured product during rapid temperature increases, maintaining productivity while ensuring the accuracy and smoothness of the three-dimensional article.
Implementation Method 1
a curable composition for stereolithography, comprising a photopolymerizable component and a photopolymerization initiator
Data Source
Figure 1
AI summary
A curable composition for stereolithography, comprising a photopolymerizable component and a photopolymerization initiator, wherein a cured product of the curable composition has a minimum value of a storage elastic modulus, in a range of from 25°C to 300°C, of not greater than 1.20×107 Pa.