3D Printing Build Material With PP-Elastomer Fusion Balance
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Solution Overview
Problem
Current 3D printing technologies face challenges in producing parts with desired combinations of stiffness, impact strength, and flexibility, particularly for applications like automotive parts, where commercially available build materials often fail to meet these requirements due to issues such as plasticizer leaching, which affects long-term properties.
Innovation Solution
A build material comprising polypropylene and elastomer particles with a surface-active coating, where the elastomer is present in an amount of 3 to 50 weight % based on the total weight, and polypropylene is a block copolymer of propylene and a C2 or C4-8 olefin, is used, along with an infrared absorbing fusing agent, to enhance the bonding and properties of 3D printed parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If plasticizers are added to improve flexibility, then flexibility is improved, but long-term properties deteriorate due to plasticizer leaching
Solution Approach 1:
The invention extracts and removes plasticizers from the material composition entirely. Instead of using plasticizers to achieve flexibility, the patent uses alternative mechanisms (such as elastomer blends or specific polymer structures) that provide flexibility intrinsically without relying on additive chemicals that can leach over time.
Solution Approach 2:
The invention employs composite material systems, specifically blends of polypropylene with elastomers (such as ethylene-propylene-diene monomer rubber or styrene-butadiene rubber). This composite approach provides flexibility through the elastomeric phase while maintaining the structural integrity and long-term stability of the polypropylene matrix, eliminating the need for plasticizers.
2Strength
If build materials are modified to achieve desired mechanical properties, then stiffness and impact strength are improved, but material complexity increases
Solution Approach 1:
The patent utilizes composite materials consisting of polypropylene blended with elastomers in specific ratios (typically 70-30 or 80-20 by weight). This composite structure provides enhanced impact strength and toughness while maintaining relatively simple processing procedures compatible with existing 3D printing technologies.
Solution Approach 2:
The invention optimizes specific parameters such as the elastomer content (3 to 50 weight %), particle size distribution, and molecular weight of the polypropylene to achieve desired mechanical properties. By carefully controlling these parameters, the patent achieves improved impact strength without unnecessarily complicating the material system.
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 proposed build material allows for the production of 3D printed parts with improved stiffness, impact strength, and flexibility, ensuring uniform properties and effective fusion during the printing process, addressing the limitations of existing materials by maintaining desired mechanical properties over time.
Implementation Method 1
The fusing agent may absorb radiation and convert the absorbed radiation to thermal energy, which in turn fuses/coalesces the build material that is in contact with the fusing agent.
Implementation Method 2
The polymeric particles comprise a surface-active coating
Data Source
AI summary
The present disclosure relates to a build material for 3D printing. The build material comprises polymeric particles comprising polypropylene and at least one elastomer. The polymeric particles comprise a surface-active coating.