PEBA Powder Composition for 3D Sintering
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Solution Overview
Problem
Current PEBA powder compositions for three-dimensional sintering face challenges in achieving good mechanical properties, flexibility, and recyclability, particularly due to issues with agglomeration, energy requirements for coalescence, and the adverse effects of high filler content on mechanical properties.
Innovation Solution
A PEBA powder composition with a specific range of polyamide to polyether block ratio, low polyamide block molar mass, and optimal flow agent content, combined with cryogenic grinding and sieving, to produce particles with controlled size distribution and improved flowability, allowing for efficient sintering at lower temperatures with enhanced mechanical properties and recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a high amount of flow agent is added to improve powder flow properties, then flowability is improved, but coalescence requires more energy and mechanical properties deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the flow agent content to a specific range (0.1-5% by weight) and controlling particle size parameters (D50 < 100 μm, D10/D50 ratio < 0.5) to achieve the right balance between flowability and coalescence energy requirements
Solution Approach 2:
The patent uses composite materials by combining PEBA polymer with specific pulverulent fillers (such as calcium carbonate, silica, or talc) at controlled contents (5-50% by weight) to improve powder flow properties while maintaining mechanical properties, reducing the need for excessive flow agents
2Manufacturing precision
If pulverulent fillers are added at high content to facilitate grinding and obtain desired particle size, then particle size control is improved, but mechanical properties of manufactured parts deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the filler content within 5-50% by weight and particle size parameters (D50 < 100 μm, D10/D50 ratio < 0.5) to achieve optimal particle size distribution while preserving mechanical properties
Solution Approach 2:
The patent uses composite materials by selecting specific filler types (calcium carbonate, silica, talc) with appropriate particle size distributions and combining them with PEBA in optimized ratios to maintain both particle size control and mechanical integrity
3Use of energy by stationary object
If the polyamide block molar mass is reduced to improve flexibility and lower sintering temperature, then sintering energy is reduced, but mechanical strength may be compromised
Solution Approach 1:
The patent applies parameter changes by optimizing the polyamide block number-average molar mass to ≤1000 g/mol and controlling the polyamide-to-polyether block weight ratio to ≤0.7, achieving lower sintering temperatures while maintaining mechanical strength through balanced composition
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 enables the production of three-dimensional articles with improved mechanical properties, such as high elongation at break and low modulus of elasticity, while maintaining good flexibility and recyclability, and allows for a wider working window in the sintering process.
Implementation Method 1
a layer of polymer powder is selectively and briefly irradiated in a chamber with electromagnetic radiation (for example laser beam, infrared radiation, UV radiation), the result being that the powder particles impacted by the radiation melt
Implementation Method 2
irradiated in a chamber with electromagnetic radiation (for example laser beam)
Implementation Method 3
irradiated in a chamber with electromagnetic radiation (for example laser beam, infrared radiation)
Implementation Method 4
irradiated in a chamber with electromagnetic radiation (for example laser beam, infrared radiation, UV radiation)
Implementation Method 5
the powder particles impacted by the radiation melt. The molten particles coalesce and solidify rapidly
Implementation Method 6
they exhibit exceptional elastic recovery properties
Data Source
AI summary
A powder of a copolymer with polyamide blocks and polyether blocks. The invention concerns a composition comprising a powder of a copolymer with polyamide blocks and polyether blocks, the copolymer being in particle form with a pulverulent filler content of 0 to 10% by mass and the copolymer having a ratio by mass of the polyamide blocks to the polyether blocks of less than or equal to 0.7, the polyamide blocks having a number-average molar mass of less than or equal to 1000 g/mol; and the composition comprising a flow aid at a content of greater than or equal to 0.3% by mass. The invention also concerns the process for producing this composition, the use of the composition for constructing three-dimensional articles, and the three-dimensional articles manufactured from said composition.