Curable Resin Composition for 3D Shaping with Low Water Absorbency
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Solution Overview
Problem
Existing resin compositions for optical three-dimensional shaping lack satisfactory mechanical strength and dimensional stability, particularly in high-humidity environments.
Innovation Solution
A curable resin composition comprising polyfunctional urethane (meth)acrylate, hydrophilic and hydrophobic monofunctional radical-polymerizable compounds, rubber particles, and a radical polymerization initiator, with a specific content of rubber particles to achieve balanced impact resistance, heat resistance, and low water absorbency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional resin compositions containing urethane (meth)acrylate, ethylenically unsaturated compound, rubber particles, and radical polymerization initiator are used for optical three-dimensional shaping, then impact resistance is improved, but water absorbency increases and dimensional stability deteriorates
Solution Approach 1:
The invention uses a composite resin composition containing multiple specific components: polyfunctional urethane (meth)acrylate (A) with at least two (meth)acryloyl groups and two urethane groups, hydrophilic monofunctional radical-polymerizable compound (B), hydrophobic monofunctional radical-polymerizable compound (C), and rubber particles (D). This multi-component composite system achieves both high impact resistance and low water absorbency, resolving the contradiction between strength and dimensional stability.
Solution Approach 2:
The invention introduces functional differentiation at the molecular level by selecting specific compounds with particular properties: compound (A) provides structural framework and impact resistance, compound (B) controls water interaction at the molecular level, and compound (C) provides hydrophobic character. This local quality differentiation within the resin system enables simultaneous achievement of impact resistance and low water absorbency.
2Strength
If rubber particles are added to improve impact resistance, then mechanical strength is improved, but water absorbency increases
Solution Approach 1:
The invention precisely controls the content of rubber particles (D) at 8-50 parts by mass per 100 parts by mass of total radical-polymerizable compounds (excluding (D))). This parameter optimization ensures sufficient impact resistance while limiting water absorbency. Additionally, the specific selection of hydrophobic compound (C) with 20-80 parts by mass per 100 parts by mass of total radical-polymerizable compounds further controls water interaction.
Solution Approach 2:
The hydrophobic monofunctional radical-polymerizable compound (C) acts as an intermediary that bridges the rubber particles and the overall resin system. By incorporating compound (C) with specific hydrophobic characteristics, the invention mediates the water interaction at the interface between rubber particles and the resin matrix, preventing water penetration while maintaining the impact resistance benefits of rubber particles.
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 enables the production of cured objects with enhanced impact resistance, heat resistance, and low water absorbency, maintaining dimensional stability even in high-humidity conditions.
Implementation Method 1
a curable resin composition according to the present disclosure is characterized in that it contains: a polyfunctional urethane (meth)acrylate (A) having at least two (meth)acryloyl groups and at least two urethane groups within a molecule; a hydrophilic monofunctional radical-polymerizable compound (B) having one radical-polymerizable functional group within a molecule; a hydrophobic monofunctional radical-polymerizable compound (C) having one radical-polymerizable functional group within a molecule; rubber particles (D); and a radical polymerization initiator (E)
Data Source
AI summary
Provided is a curable resin composition with which a cured object with low water absorbency and good impact resistance and heat resistance can be formed and which is preferably usable in three-dimensional shaping. The curable resin composition contains: a polyfunctional urethane (meth)acrylate (A); a hydrophilic monofunctional radical-polymerizable compound (B); a hydrophobic monofunctional radical-polymerizable compound (C); rubber particles (D); and a radical polymerization initiator (E), and the content of the rubber particles (D) is 8 parts by mass or more and 50 parts by mass or less with respect to 100 parts by mass of radical-polymerizable compounds.