Polyamide-Polyolefin Cutting Filament for Degradable Trimmers
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Solution Overview
Problem
Current cutting filaments made from polyamide are non-degradable, expensive due to rising crude oil costs, and prone to fibrillation, reducing their cutting efficiency as they degrade slowly and break into smaller fibers.
Innovation Solution
A cutting filament composed of a mixture of polyamide, thermoplastic polyolefin, and a prodegradant agent like iron stearate or manganese stearate, with a thermoplastic polyolefin content between 5-50% by weight and a prodegradant agent content of 0.2-20% by weight, promoting photo- and/or thermo-degradation, and optionally including an antioxidant and compatibilization agents to enhance degradability and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional polyamide cutting filaments are used, then cutting efficiency is maintained, but the filaments are non-degradable and expensive due to rising crude oil costs
Solution Approach 1:
The patent applies composite materials by combining polyamide with thermoplastic polyolefin (5-50% by weight) and prodegradant agents (0.2-20% by weight) to create a multi-component filament structure. This composite approach allows the filament to maintain the cutting efficiency of polyamide while incorporating biodegradable polyolefin to reduce manufacturing costs and improve environmental degradability.
Solution Approach 2:
The patent changes the chemical composition parameters of the filament by introducing specific proportions of thermoplastic polyolefin (5-50% by weight) and prodegradant agents (0.2-20% by weight). These parameter changes enable the filament to degrade more quickly in the environment while maintaining satisfactory cutting efficiency during its service life.
2Strength
If traditional polyamide cutting filaments are used, then structural integrity is maintained, but the filaments degrade slowly and fibrillate, reducing cutting efficiency over time
Solution Approach 1:
The patent applies preliminary action by incorporating prodegradant agents (iron stearate, manganese stearate, or cobalt stearate at 0.2-20% by weight) into the filament structure before use. These agents are pre-distributed throughout the polyamide-polyolefin composite to initiate and accelerate degradation processes after the filament completes its service life, preventing long-term fibrillation while maintaining structural integrity during active use.
3Ease of manufacture
If thermoplastic polyolefin is added to improve degradability, then environmental degradability is enhanced, but mechanical properties may be compromised
Solution Approach 1:
The patent optimizes the concentration parameters of thermoplastic polyolefin (5-50% by weight) to achieve the right balance between degradability and mechanical properties. This controlled parameter change ensures sufficient environmental degradability while maintaining the necessary mechanical strength for cutting applications.
Solution Approach 2:
The patent uses composite materials combining polyamide (providing mechanical strength) with thermoplastic polyolefin (providing degradability). This composite structure allows each material to contribute its advantageous properties, with polyamide maintaining structural integrity and polyolefin enabling environmental degradation, resolving the contradiction between strength and degradability.
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 filament degrades quickly in the environment, maintaining cutting efficiency and reducing manufacturing costs, with enhanced flexibility and hardness, and preventing fibrillation, while ensuring stability during storage and use.
Implementation Method 1
The prodegradant agent comprises an agent promoting photo-degradation and/or an agent promoting thermo-degradation of the thermoplastic polyolefin
Implementation Method 2
The prodegradant agent comprises an agent promoting photo-degradation and/or an agent promoting thermo-degradation of the thermoplastic polyolefin
Data Source
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AI summary
The present invention relates to a cutting member, especially to a cutting filament, for a plant-cutting device such as a scrub cutter or edge trimmer wherein at least one portion of the cutting member is a mixture of at least a polyamide, at least one thermoplastic polyolefin and at least one prodegradant agent. Another object of the invention relates to a composition for use in the manufacture of a cutting member by extrusion/drawing or by injection, made from a mixture of at least a polyamide, at least one thermoplastic polyolefin and at least one prodegradant agent.