Biodegradable Textile Masterbatch for Synthetic Fiber Decomposition
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Solution Overview
Problem
Conventional synthetic textiles are not biodegradable and contribute significantly to environmental pollution, accumulating in landfills and marine environments, and their degradation is slow, posing health risks through microfiber pollution.
Innovation Solution
A masterbatch comprising calcium carbonate and aliphatic polyesters, such as polycaprolactone, blended with PET, nylon, or olefins, which accelerates biodegradation while maintaining durability and water resistance, decomposing into methane and carbon dioxide within a reasonable time frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional synthetic polymers (PET, nylon, olefins) are used for textiles, then durability and water-resistance are improved, but biodegradability deteriorates (remaining in landfills for hundreds of years)
Solution Approach 1:
The patent creates a composite material system combining conventional synthetic polymers (PET, nylon, or olefins) with biodegradable aliphatic polyesters (such as polycaprolactone, polyglycolic acid, or poly(lactic-co-glycolic acid)). This composite approach allows the textile to maintain the durability and water-resistance of the synthetic polymer while the biodegradable component enables controlled degradation over time, resolving the contradiction between longevity and environmental persistence.
Solution Approach 2:
The invention applies local quality by incorporating biodegradable aliphatic polyester segments specifically within the polymer structure or as additives in the textile matrix. These localized biodegradable regions serve as sacrificial elements that degrade first, initiating the breakdown process while the bulk synthetic polymer maintains structural integrity during the service life of the textile, then progressively degrades afterward.
2Duration of action of stationary object
If biodegradable polymers are used to replace synthetic polymers, then biodegradability is improved, but durability and water-resistance deteriorate
Solution Approach 1:
The patent employs composite materials by formulating a blend where biodegradable aliphatic polyesters are combined with conventional synthetic polymers known for durability. The synthetic polymer component provides the necessary mechanical strength, wear resistance, and water-resistance, while the biodegradable component ensures environmental degradation. This composite strategy allows both contradictory requirements to be satisfied simultaneously.
Solution Approach 2:
The invention utilizes parameter changes by carefully controlling the ratio, molecular weight, and crystallinity of the biodegradable aliphatic polyester components in the composite. By adjusting these parameters, the degradation rate can be tuned to occur after the textile has fulfilled its service life, while maintaining adequate durability during use. The synthesis conditions and composition ratios are optimized to balance performance and biodegradability.
3Duration of action of stationary object
If high amounts of biodegradable additives are used to accelerate decomposition, then biodegradability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent applies parameter changes by optimizing the concentration of biodegradable aliphatic polyester components to effective levels that accelerate decomposition without requiring excessive amounts. By adjusting parameters such as the type of aliphatic polyester, its molecular weight distribution, and its proportion in the composite (typically 5-50 wt%), the invention achieves enhanced biodegradability with moderate additive levels, avoiding the need for complex multi-component systems or high concentrations that would increase manufacturing complexity.
Solution Approach 2:
The invention uses local quality by incorporating biodegradable components in targeted amounts and distributions within the textile structure. Rather than uniformly dispersing high amounts of additives throughout the entire material, the biodegradable aliphatic polyesters are strategically positioned or concentrated in specific phases or regions where they can effectively initiate and propagate degradation, thereby achieving high biodegradability with lower overall additive content and simpler manufacturing.
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 enhances biodegradability of synthetic textiles, allowing them to decompose by 40-80% within 266 days, maintaining dimensional stability, colorfastness, and bursting strength, while effectively reducing environmental impact.
Implementation Method 1
The solution enhances biodegradability of synthetic textiles, allowing them to decompose by 40-80% within 266 days
Implementation Method 2
decomposing into methane and carbon dioxide within a reasonable time frame
Data Source
AI summary
A masterbatch is disclosed, along with associated methods, and biodegradable filaments, fibers, yarns and fabrics. The masterbatch includes 0.2 to 5 mass % CaCO3, an aliphatic polyester with a repeat unit having from two to six carbons in the chain between ester groups, with the proviso that the 2 to 6 carbons in the chain do not include side chain carbons, and a carrier polymer selected from the group consisting of PET, nylon, other thermoplastic polymers, and combinations thereof.