Powder Material for 3D Modeling with Resin Blend Coating
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Solution Overview
Problem
Powder materials for 3D modeling used in additive manufacturing are prone to agglomeration in high temperature and high humidity environments due to moisture absorption, leading to reduced storage stability and strength of the final 3D objects.
Innovation Solution
A powder material comprising a base particle coated with a resin blend of a first water-soluble resin with thermally reversible sol-gel phase transition and a second water-soluble resin, such as modified polyvinyl alcohol, which maintains solubility and strength across varying temperature and humidity conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a water soluble resin is used to coat base particles for 3D modeling, then the resin provides good adhesion and binding properties, but the powder material absorbs moisture in high temperature and humidity environments causing agglomeration
Solution Approach 1:
The patent uses a composite resin system combining a water-soluble resin (first resin) and a water-insoluble resin (second resin). The water-soluble resin provides initial adhesion and binding properties for green strength, while the water-insoluble resin prevents moisture absorption and agglomeration during storage. This composite approach allows both functionalities to coexist without compromising either binding or storage stability.
Solution Approach 2:
The patent modifies the chemical composition parameters of the resin coating by controlling the ratio and types of resins used. Specifically, it adjusts the molecular weight, functional groups, and hydrophobicity parameters of the resin blend to achieve optimal balance between water solubility (for adhesion) and water resistance (for storage stability).
2Stability of the object's composition
If the resin coating is made more hydrophobic to prevent moisture absorption, then storage stability improves, but adhesion and binding properties deteriorate
Solution Approach 1:
The patent creates a synergistic composite where the hydrophilic water-soluble resin component ensures good adhesion to base particles and provides green strength, while the hydrophobic water-insoluble resin component forms a protective barrier against moisture. The interfacial interaction between these two resin types maintains both binding properties and storage stability.
Solution Approach 2:
The resin coating exhibits local quality differentiation where different regions or phases of the coating have different hydrophobicity levels. The water-soluble resin provides localized adhesion zones, while the water-insoluble resin provides localized moisture barrier zones, allowing the coating to perform both functions simultaneously.
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 resin blend prevents agglomeration and enhances the storage stability and strength of 3D objects by adjusting solubility properties according to environmental conditions, ensuring the 3D objects maintain their complex form and structural integrity.
Implementation Method 1
a first aqueous solution of the first water soluble resin having a concentration of two percent by mass has a thermally reversible sol-gel phase transition and is gelated at temperatures higher than a first phase transition temperature of the first aqueous solution
Data Source
AI summary
A powder material for three-dimensional modeling includes a base particle and a resin including a first water soluble resin and a second water soluble resin, wherein a first aqueous solution of the first water soluble resin having a concentration of two percent by mass has a thermally reversible sol-gel phase transition and is gelated at temperatures higher than a first phase transition temperature of the first aqueous solution.