Core-Shell Support Material for Robust Soluble 3D Printing
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Solution Overview
Problem
Existing extrusion-based 3D-printing technologies face challenges in providing support materials that are both soluble and mechanically robust, as current water-soluble polymers are brittle and adding plasticizers compromises thermal stability and solubility, while breakaway materials risk damaging the printed object.
Innovation Solution
A support material comprising a first copolymer with carboxyl, phenyl, and carboxylate ester monomer units, combined with a core-shell impact modifier, which enhances mechanical properties and allows for solvent-based removal without impairing thermal stability or solubility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If water-soluble polymers are used as support material, then solubility is improved, but mechanical strength deteriorates due to brittleness
Solution Approach 1:
The invention uses a composite material system consisting of a water-soluble polymer matrix combined with a core-shell impact modifier. The core-shell particles (with rubbery core and harder shell) disperse within the polymer matrix to provide reinforcement and improve mechanical strength while maintaining the water-solubility of the support material. This composite approach resolves the contradiction between solubility and mechanical strength.
2Strength
If plasticizers are added to improve ductility, then mechanical properties are improved, but thermal stability and solubility deteriorate
Solution Approach 1:
The core-shell impact modifier acts as an intermediary reinforcement mechanism instead of using plasticizers. The rubbery core of the core-shell particles provides ductility and impact resistance through a different mechanism (particle-matrix interface debonding and void formation) that does not involve plasticization. This avoids the trade-off between ductility improvement and thermal stability/solubility deterioration.
3Ease of operation
If breakaway support material is used, then removal ease is improved, but object integrity deteriorates due to mechanical damage
Solution Approach 1:
The invention replaces the mechanical removal process (trimming, sanding) with a chemical dissolution process. The water-soluble polymer matrix dissolves in water or aqueous solutions, allowing the support material to be removed by simple soaking without any mechanical contact with the printed object. This eliminates the risk of mechanical damage while maintaining ease of removal.
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 achieves improved mechanical properties and efficient solvent-based removal, maintaining thermal stability and solubility, suitable for use in filament form for extrusion-based 3D printing.
Implementation Method 1
the impact modifier is a core-shell impact modifier... core-shell impact modifier have turned out to be very advantageous in order to improve the mechanical properties of water-soluble support materials
Implementation Method 2
a plurality of carboxyl monomer units derived from acrylic acid monomers... support materials according to the invention exhibit fully sufficient dissolution characteristics in a 1M NaOH environment
Implementation Method 3
soluble support materials are known that can be removed simply by placing the printed object in a bath of a suitable solvent or water... support materials according to the invention exhibit fully sufficient dissolution characteristics in a 1M NaOH environment
Data Source
AI summary
The invention pertains to a support material for a digital manufacturing system, comprising a first copolymer and at least one impact modifier, wherein the first copolymer comprises a plurality of carboxyl monomer units derived from acrylic acid monomers, preferably methacrylic acid monomers (MAA); a plurality of phenyl monomer units, preferably phenyl monomer units derived from styrene monomers; and a plurality of carboxylate ester monomer units derived from alkyl (meth)acrylate monomers; and wherein the impact modifier is a core-shell impact modifier.