Core-Shell 3D Printing Wire for Stronger Interlayer Bonding
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Solution Overview
Problem
Existing melt blending-based technologies fail to address the weakening of interlayer bonding strength in 3D printing wires, especially at high filling contents, leading to issues like brittleness and printability contradictions.
Innovation Solution
A core-shell structured 3D printing wire is developed, where a first polymer matrix composite forms the core and a second polymer matrix composite forms the shell, with differing glass transition temperatures and tensile elastic moduli, enhancing interlayer bonding strength and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polymer material with high rigidity is used to achieve high composite filling content, then the end-use mechanical properties are improved, but the wire becomes very brittle and interlayer bonding strength significantly weakens
Solution Approach 1:
The wire is segmented into core and shell regions with different filler contents. The core contains high filler content (60-90 wt%) for mechanical strength, while the shell contains low filler content (0-40 wt%) for flexibility and bonding. This segmentation allows each region to perform its specialized function without compromising the other.
Solution Approach 2:
Different regions of the wire are assigned different material compositions tailored to local requirements. The core region has high rigidity for structural support, while the shell region has low rigidity for interlayer bonding and flexibility. This local quality differentiation resolves the contradiction between overall strength and interlayer bonding.
2Quantity of substance
If a dispersed multi-phase structure is used in the wire, then composite filling content is increased, but bonding between printed layers is weakened
Solution Approach 1:
The dispersed multi-phase structure is reorganized into a segmented core-shell architecture. Instead of random dispersion, the filler is concentrated in the core region while the shell remains relatively pure polymer. This segmentation prevents the shell from becoming too rigid and maintains its bonding capability.
Solution Approach 2:
The wire is constructed as a composite of two distinct polymer matrix composites: a high-filler core composite and a low-filler shell composite. This composite structure allows the high filler content to provide mechanical properties while the low filler content shell provides bonding, resolving the contradiction between quantity of filler and bonding strength.
3Ease of manufacture
If general modification technology is used, then material processing is simplified, but contradictions between printability and end-use properties cannot be deeply optimized
Solution Approach 1:
The modification approach is segmented into two distinct processes: co-extrusion for structural formation and separate filler mixing for composition control. This allows independent optimization of printability (through shell composition) and end-use properties (through core composition) without compromising the other.
Solution Approach 2:
The invention uses composite materials with different filler contents in the core and shell to simultaneously achieve good printability (low filler shell) and excellent end-use properties (high filler core). This composite approach enables deep optimization of both printability and performance, going beyond what general modification technology can achieve.
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 core-shell structure improves interlayer bonding strength and rigidity, preventing brittleness and ensuring smooth extrusion, thus enhancing printing efficiency and quality.
Implementation Method 1
co-extruding a first polymer matrix composite and a second polymer matrix composite to produce the 3D printing wire with a core-shell structure
Implementation Method 2
controlling a printhead device of the printing apparatus to heat a 3D printing wire to 150° C. to 400° C. and extrude the printing material
Data Source
AI summary
A 3D printing wire, a method for preparing the 3D printing wire, a 3D printing method, and a 3D printing apparatus are provided. The method for preparing the 3D printing wire includes: co-extruding a first polymer matrix composite and a second polymer matrix composite to produce a 3D printing wire with a core-shell structure. In the 3D printing wire with the core-shell structure, a shell structure formed by the second polymer matrix composite is wrapped around a core structure formed by the first polymer matrix composite. A filler material volume fraction of the first polymer matrix composite is larger than a filler material volume fraction of the second polymer matrix composite. The material for the shell structure includes an unfilled polymer material with a composite filling content of zero.