Thermoplastic Elastomer 3D Printing with Alkyl Carboxylate Fusing Agent
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Solution Overview
Problem
Existing three-dimensional printing techniques face challenges in achieving optimal mechanical properties, such as stiffness and tensile strength, due to the brittleness of objects printed with conventional fusing agents, which often result in failure under stress.
Innovation Solution
A three-dimensional printing kit and method utilizing a powder bed material comprising 80 wt% to 99.5 wt% thermoplastic elastomeric particles and 0.5 wt% to 6 wt% C12-C24 straight-chain alkyl carboxylate, combined with a fusing agent including water, organic co-solvent, and a radiation absorber, to enhance stiffness and mechanical properties by selectively fusing the particles with electromagnetic radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional fusing agents are used to print three-dimensional objects, then the printing process can be completed, but the resulting objects exhibit brittleness and fail under stress
Solution Approach 1:
The patent applies composite materials by combining thermoplastic elastomeric particles with a specifically formulated fusing agent containing C12-C24 straight-chain alkyl carboxylate. This composite approach creates a material system where the elastomeric particles provide flexibility and the carboxylate-modified fusing agent enhances bonding, resulting in printed objects with improved tensile strength and reduced brittleness compared to conventional single-material systems.
Solution Approach 2:
The patent changes the chemical parameters of the fusing agent by incorporating C12-C24 straight-chain alkyl carboxylate, which fundamentally alters the interaction between the fusing agent and thermoplastic elastomeric particles. This parameter change in the fusing agent composition enables better adhesion and more uniform fusion, transforming the mechanical properties of the printed objects from brittle to ductile with enhanced strength.
2Strength
If thermoplastic elastomeric particles are used as powder bed material, then stiffness can be enhanced, but temperature control becomes critical to prevent excessive heating and caking
Solution Approach 1:
The C12-C24 straight-chain alkyl carboxylate acts as an intermediary substance between the electromagnetic radiation and the thermoplastic elastomeric particles. It absorbs the radiation energy and facilitates controlled heat transfer to the particles, enabling the desired stiffness enhancement while mediating the temperature rise to prevent excessive heating and caking that would occur with direct radiation exposure.
Solution Approach 2:
The patent changes the thermal parameters of the system by introducing the carboxylate compound, which modifies the heat absorption and distribution characteristics. This parameter change in the material composition allows for controlled heating that achieves the necessary temperature for fusion and stiffness enhancement without exceeding the threshold that would cause caking and degradation.
3Strength
If high concentration of additives is used to adjust mechanical properties, then stiffness can be enhanced, but the complexity of material formulation increases
Solution Approach 1:
The patent achieves stiffness enhancement by changing the concentration parameter of a single key component (C12-C24 straight-chain alkyl carboxylate) within an optimized range, rather than combining multiple additives. This single-parameter optimization approach simplifies the material formulation complexity while still achieving the desired mechanical property adjustments, avoiding the need for complex multi-component systems.
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 significantly enhances the stiffness and tensile strength of printed objects, reducing brittleness and improving their mechanical performance, as demonstrated by increased Young’s Modulus and elongation at break, while maintaining control over temperature to prevent excessive heating and caking.
Implementation Method 1
absorbed light energy at those portions of the layer having the fusing agent printed thereon can be converted to thermal energy
Implementation Method 2
causing that portion to melt or coalesce
Implementation Method 3
selectively fusing the particles with electromagnetic radiation
Data Source
AI summary
A three-dimensional printing kit can include a powder bed material including from about 80 wt% to about 99.5 wt% thermoplastic elastomeric particles having a D50 particle size from about 2 µm to about 150 µm and from about 0.5 wt% to about 6 wt% C12-C24 straight-chain alkyl carboxylate. The three-dimensional printing kit can also include a fusing agent including water, organic co-solvent, and a radiation absorber to generate heat from absorbed electromagnetic radiation.