Soluble Support Material for Electrophotography 3D Printing
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Solution Overview
Problem
Existing electrophotography-based additive manufacturing systems face challenges in producing a support material that is soluble, thermally stable, and capable of maintaining a stable triboelectric charge, while having thermal properties similar to the part material, to effectively print 3D parts with overhanging features and delicate geometries.
Innovation Solution
A support material composed of a thermoplastic copolymer with aromatic groups, (meth)acrylate-based ester groups, and anhydride groups, with high anhydride conversion, is developed. This material is triboelectrically charged and used in a powder form with a controlled particle size, allowing it to be used in an electrophotography-based additive manufacturing system for layer-by-layer printing of support structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a support material is made soluble in aqueous solutions for easy removal, then ease of operation is improved, but thermal stability may deteriorate
Solution Approach 1:
The support material uses a copolymer composition with specific functional groups (carboxylic acid, hydroxyl, amine) that enable solubility in aqueous solutions at controlled pH levels, while the molecular weight and crosslinking density are optimized to maintain thermal stability during the printing process. This parameter optimization allows the material to be thermally stable during printing but soluble during removal.
2Manufacturing precision
If the support material has thermal properties similar to the part material, then manufacturing precision is improved, but the solubility may deteriorate
Solution Approach 1:
The support material is formulated as a composite copolymer system combining hydrophobic segments (for thermal compatibility with part material) and hydrophilic segments (for aqueous solubility). This composite structure enables the material to exhibit both thermal properties similar to the part material for accurate printing and solubility in aqueous solutions for easy removal.
3Reliability
If the support material maintains a stable triboelectric charge, then reliability is improved, but ease of manufacture deteriorates
Solution Approach 1:
The copolymer composition is specifically designed with functional groups that provide stable triboelectric charge characteristics. The charge stability is achieved by optimizing the molecular structure and surface properties of the copolymer, while the manufacturing process is simplified by using commercially available monomers and standard polymerization techniques.
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 support material enables the printing of 3D parts with overhanging features and delicate geometries by providing strong adhesion and thermal stability, while being soluble in aqueous solutions for easy removal, thus maintaining the quality and integrity of the printed parts.
Implementation Method 1
This material is triboelectrically charged and used in a powder form with a controlled particle size
Implementation Method 2
The support material adheres to the part material during fabrication
Implementation Method 3
the support material is at least partially soluble in an aqueous solution (e.g., an aqueous alkaline solution)
Data Source
AI summary
A support material for printing a support structure with an electrophotography-based additive manufacturing system, the support material including a composition having a charge control agent and a thermoplastic copolymer having aromatic groups, (meth)acrylate-based ester groups, carboxylic acid groups, and anhydride groups, with a high anhydride conversion. The composition is provided in a powder form having a controlled particle size, and the support material is configured for use in the electrophotography-based additive manufacturing system having a layer transfusion assembly for printing the support structure in a layer-by-layer manner, and is at least partially soluble in an aqueous solution.