Epoxy Composites with Functionalized Fillers for 3D Printing
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Solution Overview
Problem
Achieving high particle loading in 3D printable epoxy polymer composites is hindered by particle agglomeration and poor dispersion, leading to inferior mechanical properties and unsuitable rheology for extrusion 3D printing, particularly with low graphene or CNT loadings and rapid curing issues.
Innovation Solution
A composition comprising at least 10 wt % epoxy functionalized 2D shaped particles and 0.1 to 5 wt % carbon nanotubes, mixed with an epoxy resin and curing agent, allowing for superior dispersion and rheological properties suitable for extrusion printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high particle loading (>10 wt %) is used to improve mechanical properties, then elastic modulus and strength are enhanced, but particle agglomeration and poor dispersion occur resulting in inferior mechanical properties and unsuitable rheology for 3D printing
Solution Approach 1:
The patent applies parameter changes by functionalizing the particle surface chemistry to alter interfacial interactions. Specifically, epoxy-functionalized graphene and carboxylated CNTs are used to modify the surface properties of filler particles, enabling better dispersion in the epoxy matrix at high loadings (>10 wt %) while maintaining suitable rheology for 3D printing.
Solution Approach 2:
The patent employs composite materials by creating a multi-component system consisting of epoxy resin, epoxy-functionalized graphene (10-30 wt %), carboxylated carbon nanotubes (0.1-5 wt %), and curing agents. This composite formulation leverages the synergistic effects of different functionalized fillers to achieve both high mechanical properties and printability.
2Temperature
If high particle loading is used to increase elastic modulus, then structural rigidity is improved, but particle agglomeration results in poor dispersion and reduced toughness
Solution Approach 1:
The patent changes the surface chemistry parameters of the filler particles through functionalization. Epoxy groups on graphene and carboxyl groups on CNTs create favorable interfacial interactions with the epoxy matrix, preventing agglomeration even at high loadings (10-30 wt % graphene, 0.1-5 wt % CNTs). This enables achieving high elastic modulus while maintaining toughness through uniform dispersion.
3Productivity
If conventional epoxy formulations with amine hardener are used, then rapid curing at room temperature is achieved, but clogged tubing and nozzles occur in extrusion printers
Solution Approach 1:
The patent changes the curing kinetics parameters by selecting a different curing agent system. Instead of conventional amine hardeners that cure rapidly at room temperature, the patent uses curing agents that provide slower, more controlled curing rates. This allows the viscous composite material to flow through extrusion printer tubing and nozzles without clogging, while still achieving complete curing of the final part.
4Ease of operation
If rheology modifiers such as clay particles are added to tune viscosity for 3D printing, then extrusion flow is improved, but mechanical properties such as toughness and strength are reduced
Solution Approach 1:
The patent changes the rheological properties of the composite by functionalizing the graphene and CNTs with epoxy and carboxyl groups, respectively. These functional groups create favorable interfacial interactions that form a percolating network structure in the epoxy matrix, providing shear-thinning behavior and appropriate viscosity for extrusion printing without requiring additional rheology modifiers like clay particles. This approach maintains superior mechanical properties.
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 solution results in structures with significantly increased elastic modulus and toughness while maintaining tensile strength, enabling effective 3D printing with improved printability and mechanical properties.
Implementation Method 1
Highly dispersible particles do not form a strong network in the resin
Implementation Method 2
epoxy functionalized two-dimensional shaped particles, carbon nanotubes
Implementation Method 3
incorporating an amine hardener as curing agent, they cure rapidly at room temperature
Implementation Method 4
They have improved mechanical properties such as strength and elastic modulus. These composites form robust structures with high crosslinking density after curing
Implementation Method 5
Highly dispersible particles do not form a strong network in the resin
Implementation Method 6
required to retain 3D printed shape after extrusion
Data Source
AI summary
A composition of matter comprises at least 10 wt % epoxy functionalized two-dimensional shaped particles, carbon nanotubes in the range of 0.1 to 5 wt %, epoxy resin and a curing agent. A method of manufacturing a composition of matter includes mixing epoxy resin, carbon nanotubes and a solvent to produce a material, drying the material, and mixing the material with a curing agent to product the composition of matter. A method of printing a composition of matter includes producing the composition of matter by combining epoxy functionalized graphene, carbon nanotubes, epoxy base resin, and a curing agent, extrusion printing the composition of matter into a desired pattern, and curing the pattern.