Polyolefin 3D Printing Powder Blend for Flowability and Toughness
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Solution Overview
Problem
Existing 3D printing materials based on polyolefins face challenges such as high cost, limited mechanical properties, narrow processing windows, and inadequate flowability, making them unsuitable for processes like selective laser sintering and multi-jet fusion, while also lacking the ability to reuse non-agglomerated material effectively.
Innovation Solution
A 3D printable powder comprising a thermoplastic blend of 75-98 wt% polyolefin matrix and 2-25 wt% olefinic thermoplastic elastomer, combined with a flow aid, which enhances mechanical properties, thermal conductivity, and processing window, allowing use in additive processes like SLS and MJF, and enabling material reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polyolefin-based materials are used for 3D printing, then cost is reduced and chemical/heat resistance is improved, but mechanical properties deteriorate and processing window narrows
Solution Approach 1:
The patent uses a composite material system consisting of polyolefin resin combined with elastomer particles (2-25 wt%) and flow aids (1-10 wt%). This composite approach allows the material to maintain the cost and chemical resistance benefits of polyolefins while the elastomer component enhances mechanical properties such as elongation at break and impact resistance, and the flow aid component improves processing characteristics including flowability and processing window.
2Ease of manufacture
If polyolefin-based materials are used for 3D printing, then cost is reduced, but flowability deteriorates and processing window narrows
Solution Approach 1:
The patent introduces flow aid substances as intermediary components that mediate between the polyolefin matrix and the printing process. These flow aids (1-10 wt%), which may include silanes, waxes, or other lubricating agents, improve the flowability of the powder material during deposition and facilitate better layer formation, thereby expanding the processing window without compromising the cost benefits of using polyolefin-based materials.
3Strength
If conventional 3D printing materials are used, then mechanical strength is achieved, but material reuse capability deteriorates
Solution Approach 1:
The patent modifies the material composition parameters by incorporating elastomer particles and flow aids into the polyolefin matrix. This compositional change results in improved layer adhesion and material properties that enable better reuse of non-agglomerated material. The elastomer component provides flexibility and bonding capability that maintains mechanical strength while the flow aid ensures consistent flow characteristics upon reuse, thereby enhancing adaptability for multiple printing cycles.
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 provides 3D printable powders with improved elongation at break, impact resistance, and a wide processing window, ensuring stable layer adhesion and enabling the production of 3D articles with desired dimensions and properties, while being cost-effective and suitable for multiple printing techniques.
Implementation Method 1
the at least one olefinic thermoplastic elastomer is chosen from ethylene acetate elastomers, ethylene acrylate elastomers, ethylene propylene elastomers and ethylene alpha-olefin elastomers
Implementation Method 2
the 3D printable powder comprises at least one flow aid
Implementation Method 3
the slices are produced one by one in the form of layers, by carrying out the following binary sequence repeatedly: depositing a layer of the material necessary for producing the desired article on a platform or on an existing consolidated layer, followed by agglomerating said layer and bonding said layer to the precedent
Data Source
AI summary
The invention relates to 3D printable powders comprising 75-98 wt% of a polymeric matrix containing at least 90 wt% of polyolefin(s) and 2-25 wt% of at least one olefinic thermoplastic elastomer chosen from ethylene acetate elastomers, ethylene acrylate elastomers, ethylene propylene elastomers and ethylene alpha-olefin elastomers. The invention further relates to the preparation of these 3D printable powders and to their use in an additive process.