PLA Polyurethane Block Copolymer 3D Printing
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Solution Overview
Problem
Conventional polylactic acid (PLA) resins used in 3D printing have limitations such as high melting temperatures, low flexibility, and slow solidification rates, which hinder efficient processing and mechanical properties.
Innovation Solution
A polylactic acid resin composition is developed, comprising a hard segment of polylactic acid repeat units and a soft segment of polyurethane polyol units linked via urethane bonds, with a melting temperature of 170°C or less, a glass transition temperature of 55°C or less, and a number-average molecular weight of 50,000 or more, enhancing flexibility and crystallization rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional PLA resins are used for 3D printing, then they are eco-friendly and have low melting temperatures, but they have slow solidification rates and low flexibility
Solution Approach 1:
The patent creates a block copolymer composite material consisting of PLA segments (for eco-friendliness and low melting temperature) and polyurethane segments (for flexibility and solidification rate). This composite structure allows the material to simultaneously exhibit properties of both constituent polymers, resolving the contradiction between low melting temperature and fast solidification rate
Solution Approach 2:
The patent modifies the chemical structure parameters of PLA by introducing polyurethane segments through block copolymerization. This changes the thermal and mechanical parameters of the original PLA, achieving both low melting temperature (inherited from PLA) and improved solidification rate (enhanced by polyurethane segments)
2Temperature
If conventional PLA resins are used for 3D printing, then they have low melting temperatures allowing low-temperature processing, but they have low flexibility and are prone to breakage
Solution Approach 1:
The block copolymer combines PLA segments (providing low melting temperature and eco-friendliness) with polyurethane segments (providing flexibility and elasticity). The segmented structure allows each component to contribute its advantageous properties, achieving both low processing temperature and improved flexibility
Solution Approach 2:
The patent introduces local flexibility through polyurethane segments within the polymer chain. These soft segments are distributed throughout the rigid PLA matrix, providing localized flexibility without compromising the overall structural integrity and low melting temperature characteristics
3Strength
If ABS is used for 3D printing, then it has good mechanical properties such as toughness, but it has high melting temperatures and generates noxious gas
Solution Approach 1:
The patent adopts PLA as the base material, which is biodegradable and eco-friendly compared to conventional engineering plastics like ABS. While PLA has inherently lower mechanical properties, the block copolymer structure with polyurethane segments enhances flexibility, creating a sustainable alternative that balances mechanical performance with environmental considerations
Solution Approach 2:
The patent modifies the thermal parameters of the resin composition to achieve low melting temperature (suitable for eco-friendly processing) while maintaining adequate mechanical properties through the block copolymer structure. This parameter optimization allows processing at lower temperatures without requiring high-temperature resistant materials like ABS
4Strength
If conventional PLA resins are modified by adding plasticizer or chain extender, then flexibility is improved, but solidification rate remains insufficient
Solution Approach 1:
Instead of adding plasticizers or chain extenders as separate components, the patent creates an integrated block copolymer composite where polyurethane segments are covalently bonded to PLA segments. This structural integration provides flexibility enhancement while the polyurethane segments' inherent properties also improve solidification rate, avoiding the trade-off present in conventional modification approaches
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 composition allows for low-temperature, high-speed processing with improved mechanical properties and eco-friendly characteristics, facilitating rapid solidification and enhanced processability in 3D printing.
Implementation Method 1
a polylactic acid resin composition for three-dimensional (3D) printing, which has not only a lower melting temperature than those of conventional polylactic acid resin compositions
Implementation Method 2
a high solidification rate and eco-friendly characteristics
Data Source
AI summary
A polylactic acid resin composition, which comprises: a hard segment containing a polylactic acid repeat unit; and a soft segment containing a polyurethane polyol repeat unit in which polyether-based polyol repeat units are linearly connected to each other via a urethane linkage, can be processed at low temperatures and at high rates, has a high solidification rate, and is eco-friendly, due to a low melting point thereof, and thus is useful for 3D printing.