Biodegradable Nylon Trimmer Line with Starch Composite
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Solution Overview
Problem
Current trimmer lines face issues with biodegradability and durability, as they either produce micro-plastics or are less durable due to the use of petroleum-based or bio-based polymers, and they often have to choose between being biodegradable or colorable.
Innovation Solution
Incorporating monomers like caprolactam, caprolactone, 6-aminocaproic acid, adipic acid, and a biodegradation promoter into a nylon-based trimmer line composition, along with a color masterbatch, to enhance both durability and biodegradability while maintaining colorability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If petroleum-based polymers with prodegradant catalysts are used to increase biodegradability, then biodegradability is improved, but durability is worsened and micro-plastics are generated
Solution Approach 1:
The patent uses a composite material system consisting of polyamide polymer matrix combined with starch biodegradation promoter and coloring agents. This composite approach allows the trimmer line to maintain the strength and durability of nylon while incorporating biodegradable starch components that break down over time, eliminating micro-plastic generation. The starch acts as a prodegradant catalyst within the composite structure, enabling controlled biodegradation without compromising initial mechanical properties.
Solution Approach 2:
The patent changes the chemical composition parameters of the trimmer line by incorporating specific ratios of polyamide (85-95 wt%) and starch (5-15 wt%). By adjusting these compositional parameters and adding biodegradation promoters, the material achieves both durability during use and controlled biodegradability after use, resolving the contradiction between strength and biodegradability.
2Duration of action of stationary object
If starch is used to improve biodegradability, then biodegradability is improved, but colorability is worsened due to brown color
Solution Approach 1:
The patent introduces coloring agents as intermediaries that bridge the starch component and the final product appearance. These agents are specifically selected to mask the natural brown color of starch while allowing the trimmer line to be produced in various colors. The coloring agents enable both biodegradability (through starch) and colorability (through dyes) to coexist in the same product.
Solution Approach 2:
The composite material system includes polyamide, starch, and coloring agents working together. The coloring agents compensate for the brown color of starch, enabling the production of colored trimmer lines that are both biodegradable and visually identifiable. This composite approach resolves the colorability issue while maintaining biodegradability.
3Duration of action of stationary object
If bio-based polymers are used to improve biodegradability, then biodegradability is improved, but durability is worsened due to brittleness
Solution Approach 1:
The patent creates a composite material where biodegradable starch (5-15 wt%) is embedded within a durable polyamide matrix (85-95 wt%). The polyamide provides the mechanical strength and flexibility needed for trimmer line performance, while the starch provides biodegradability. This composite structure eliminates the brittleness issue by using the strong polyamide as the continuous phase and starch as the dispersed biodegradable phase.
Solution Approach 2:
The patent applies local quality by concentrating the biodegradable starch in specific regions or phases within the trimmer line structure, while the polyamide matrix maintains overall structural integrity. This allows different parts of the material to have different functions: the polyamide provides durability and the starch provides biodegradability, resolving the brittleness problem.
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 results in a trimmer line that degrades significantly faster than conventional nylon lines, retains strength, and reduces material loss during use, while allowing for effective coloring, thus addressing the challenges of biodegradability and durability.
Implementation Method 1
The catalysts are responsible for initiating abiotic degradation that disintegrates the trimmer line particles into soil through exposure to oxygen and heat. The resulting particles may then go through biotic degradation.
Implementation Method 2
The catalysts are responsible for initiating abiotic degradation that disintegrates the trimmer line particles into soil through exposure to oxygen and heat. However, photo-oxidative fragmentation still produces micro-plastics
Data Source
AI summary
Trimmer lines are provided. The trimmer lines include a nylon majority component, a monomer such as caprolactam, a biodegradation promoter, and a color additive and advantageously having desirable durability, biodegradability, and colorability.