Biodegradable Film Composition for Tear Resistance and Compostability
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Solution Overview
Problem
Existing biodegradable films struggle to balance high mechanical properties with rapid biodegradability, leading to challenges in waste accumulation and inadequate performance in packaging applications.
Innovation Solution
A biodegradable film composition comprising 30-95% polyester, 0.1-50% natural polymer, 1-40% polyhydroxyalkanoate, 0-15% inorganic filler, and 0-5% cross-linking agent, which includes specific aromatic and aliphatic dicarboxylic acids and diols, ensuring high tear resistance and rapid biodegradability under composting conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If biodegradable materials are used to enable rapid degradation, then environmental friendliness improves, but mechanical strength deteriorates
Solution Approach 1:
The patent employs a composite material system consisting of multiple polymer components (polyester, polyhydroxyalkanoate, natural polymer) combined in specific proportions. This composite structure allows the film to achieve both high mechanical strength through the synergistic combination of materials and rapid biodegradability through the inclusion of biodegradable components, directly resolving the contradiction between strength and environmental friendliness
Solution Approach 2:
The patent optimizes the compositional parameters by precisely controlling the weight percentages of different components (30-95% polyester, 1-40% polyhydroxyalkanoate, 0.1-50% natural polymer). By adjusting these parameters within specific ranges, the film achieves optimal balance between mechanical properties and biodegradation rate, demonstrating parameter changes as a key inventive principle
2Strength
If high polyester content is used to improve mechanical properties, then tear resistance improves, but biodegradability deteriorates
Solution Approach 1:
The patent creates a multi-component composite where polyester (providing strength) is combined with biodegradable polyhydroxyalkanoate and natural polymers (providing degradability). This composite approach allows the film to maintain high tear resistance from the polyester while ensuring rapid biodegradation through the other components, resolving the contradiction between these opposing requirements
Solution Approach 2:
The patent applies local quality by assigning different functional roles to different components: polyester provides structural integrity and tear resistance, while polyhydroxyalkanoate and natural polymers provide biodegradation pathways. Each component contributes its specific property locally within the composite structure, achieving overall performance that satisfies both requirements
3Adaptability or versatility
If multiple components are combined to achieve both strength and biodegradability, then performance balance improves, but composition complexity deteriorates
Solution Approach 1:
The patent uses composite materials to achieve versatile performance by combining polyester, polyhydroxyalkanoate, and natural polymer in a multi-component system. This composite structure enables the film to simultaneously deliver high mechanical strength and rapid biodegradability, demonstrating how composite materials can enhance adaptability and versatility
Solution Approach 2:
The patent achieves multi-functionality by designing a composite material that simultaneously provides structural strength, tear resistance, and biodegradation capability. The single film composition performs multiple functions that would otherwise require different materials, simplifying the overall system while maintaining performance balance
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 film achieves exceptional mechanical properties, including tear resistance >100 N/mm and rapid biodegradability, suitable for various packaging applications, particularly bags for goods and food packaging.
Implementation Method 1
at least one cross-linking agent and/or chain extender comprising at least one compound having two and/or more functional groups including isocyanate, peroxide, carbodiimide, isocyanurate, oxazoline, epoxide, anhydride or divinylether groups
Implementation Method 2
rapidly biodegradable under industrial composting conditions and more preferably in home composting according to standard UNI11355
Data Source
AI summary
This invention relates to a biodegradable film which is particularly suitable for the manufacture of packaging and is also characterised by high level mechanical properties.