Powder Bed Silicone Printing for Elastic Molded Articles
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Solution Overview
Problem
Powder bed 3D printing processes have not been developed for producing elastic silicone objects, limiting their application to inelastic objects, and existing methods for 3D printing silicones are complex, slow, or limited to specific geometries and materials.
Innovation Solution
A powder bed 3D printing process using a silicone resin with specific formula (I) and a crosslinker solution with a hydrosilylation catalyst, applied layer-by-layer, allowing for the production of elastic molded articles by spreading silicone resin in a powder bed and curing it with a crosslinker solution, followed by removal of non-crosslinked powder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If binder jetting process is used for 3D printing, then inelastic objects can be produced rapidly, but elastic silicone objects cannot be produced
Solution Approach 1:
The invention changes the material parameters by using powder-form silicone resin instead of liquid silicone, and changes the curing mechanism from chemical crosslinking in liquid to thermal curing of powder particles. This parameter change enables the binder jetting process to work with elastic silicone materials while maintaining high printing speed and industrial scalability.
Solution Approach 2:
The invention replaces the liquid-based chemical crosslinking system with a powder-based thermal curing system. The binder jetting process deposits binder on powder particles, and subsequent thermal treatment cures the silicone, substituting the mechanical/chemical liquid handling system with a powder processing system that is compatible with high-speed industrial printing.
2Adaptability or versatility
If extrusion process is used for silicone 3D printing, then elastic objects can be produced, but only very simple geometries are achievable
Solution Approach 1:
The invention replaces the extrusion-based mechanical deposition system with a powder bed system where binder is jetted onto powder particles. This substitution enables complex geometries to be built layer by layer with high precision, overcoming the geometric limitations of extrusion while maintaining process simplicity through the maturity of powder bed 3D printing technology.
3Productivity
If drop-on-demand process is used for silicone 3D printing, then elastic molded bodies can be produced, but production speed is low and technical complexity is high
Solution Approach 1:
The invention inverts the traditional drop-on-demand approach where material is ejected from a nozzle. Instead, it uses binder jetting where binder is deposited onto a powder bed, and the powder itself serves as both the material and the structural element. This inversion leverages the simplicity and speed of powder bed processing while achieving elastic molded body production.
Solution Approach 2:
The invention replaces the complex drop-on-demand ejection system with the simpler binder jetting system. The binder jetting process uses established inkjet technology to deposit binder on powder particles, which are then consolidated through thermal treatment. This substitution reduces technical complexity and increases production speed by utilizing mature powder bed processing infrastructure.
4Productivity
If light-curable silicone mixture is used, then elastic articles can be obtained by 3D printing, but photolytic functionalities are required in the silicone
Solution Approach 1:
The invention changes the curing mechanism from photolytic to thermal. By using powder-form silicone resin that cures through thermal treatment rather than light exposure, the material is no longer constrained by the need for photolytic functionalities. This parameter change expands the range of applicable silicone materials while maintaining efficient curing through established thermal processing methods.
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
Enables the rapid and cost-effective production of larger elastic objects, suitable for industrial use, with high productivity and the ability to produce objects with anisotropic material properties and conductive traces, without requiring photolytic functionalities.
Implementation Method 1
the crosslinker solution comprises a hydrosilylation catalyst and a silicone oil
Data Source
AI summary
Powder bed 3D printing processes for producing elastic molded silicone articles and silicone resin-containing powders suitable for the processes are provided. The processes comprise: a) layer-by-layer spreading of a powder in a powder bed 3D apparatus, wherein the powder contains a silicone resin of formula (I); b) applying a crosslinker solution to the layer of a) according to a printing pattern for the elastic molded article, wherein the crosslinker solution comprises a hydrosilylation catalyst and a silicone oil of the general formula (II); c) repeating a) and b) according to the printing pattern for the elastic molded body; and d) removing of the non-crosslinked powder.