Fiber-Blended Heterophasic Copolymer for Low-Warpage 3D Printing
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Solution Overview
Problem
Current 3D printing technologies using fiber-filled polypropylene materials face challenges such as warpage, nozzle clogging, and poor mechanical performance due to thermal gradients and incompatibility issues, leading to deformation and failure of printed parts.
Innovation Solution
A heterophasic copolymer blended with fibers, specifically a propylene-based matrix and an ethylene-based elastomer disperse phase, is formulated to achieve a melt flow rate of 0.1 to 150 g/10 min, with fiber loading between 1.0 to 40 wt%, resulting in a warpage resistance rating of at most 1 mm, suitable for extrusion-based 3D printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fiber fillers are added to polypropylene to improve mechanical properties and reduce density, then mechanical performance and thermal properties are improved, but warpage resistance deteriorates due to thermal gradients inducing crystallization and volume shrinkage
Solution Approach 1:
The patent modifies the polymer composition parameters by using heterophasic copolymer instead of homopolymer, changing the crystallization behavior and thermal properties to reduce warpage while maintaining mechanical strength from fiber reinforcement
Solution Approach 2:
The patent creates a composite material system combining heterophasic copolymer matrix with fiber fillers, where the copolymer's unique phase structure provides warpage resistance while the fibers provide mechanical reinforcement
2Strength
If fiber fillers are added to polypropylene to improve mechanical properties, then strength and thermal properties are improved, but processability deteriorates due to nozzle clogging and incompatibility issues
Solution Approach 1:
The patent changes the polymer matrix parameters by using heterophasic copolymer with specific melt flow rate (0.1 to 150 g/10 min) and phase composition, which improves processability by preventing nozzle clogging while maintaining fiber reinforcement benefits
Solution Approach 2:
The heterophasic copolymer acts as an intermediary matrix that is compatible with fiber fillers, providing a suitable chemical environment that prevents incompatibility issues and enables proper fiber-matrix bonding
3Quantity of substance
If crystalline or semi-crystalline polymers like polypropylene are used for 3D printing to achieve low density and chemical resistance, then material efficiency and chemical resistance are improved, but warpage resistance deteriorates due to thermal gradients inducing crystallization and volume shrinkage
Solution Approach 1:
The patent changes the crystallization parameters by using heterophasic copolymer with controlled phase structure, which reduces thermal gradient effects and volume shrinkage during printing while maintaining the low density and chemical resistance properties of semi-crystalline polymers
4Manufacturing precision
If amorphous polymer materials are used for 3D printing to avoid warpage, then warpage resistance is improved, but mechanical properties and thermal performance deteriorate
Solution Approach 1:
The patent creates a composite system where the heterophasic copolymer matrix provides warpage resistance through its phase structure, while the embedded fiber fillers provide the necessary mechanical properties, achieving both goals simultaneously
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 improved processability and warpage resistance, maintaining mechanical performance and preventing nozzle clogging, enabling high-quality 3D printing of complex parts with reduced deformation.
Implementation Method 1
a heterophasic copolymer comprising a matrix phase and a disperse phase
Implementation Method 2
the thermal gradients induce crystallization as the material cools down and subsequently shrinks in volume
Implementation Method 3
The technology involves melting or softening the polymer materials, in the forms of filaments or pellets, to produce polymer strands
Data Source
AI summary
The invention relates to an additive-manufacture feedstock, comprising a heterophasic copolymer having a melt flow rate of from 0.1 to 150 g/10 min (230° C./2.16 kg), measured according to ASTM D 1238, and a fiber blended in the heterophasic copolymer. The first-fiber-blended heterophasic copolymer, when in the form of a printed article, exhibits a minimized warpage. The invention also relates to methods of making the additive-manufacture feedstock and methods of 3D printing using the additive-manufacture feedstock in various forms.