Compostable Plastic Wrap Using PBAT and Oleate Compounds
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Solution Overview
Problem
Conventional plastic wraps are not environmentally friendly due to their poor biodegradability and the use of metal additives, which leads to environmental pollution even after degradation.
Innovation Solution
A compostable plastic wrap made with more than 90 wt % polybutylene adipate terephthalate, incorporating specific compounds like oleate and ether compounds in different areas to enhance decomposability and functional properties, without using metal additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional plastic wrap made of petrochemical plastic is used, then good packaging functionality is achieved, but environmental pollution occurs due to poor biodegradability
Solution Approach 1:
The patent changes the material composition parameters by using more than 90 wt% polybutylene adipate terephthalate (PBAT) instead of conventional petrochemical plastics, fundamentally altering the biodegradability parameter while maintaining packaging functionality
Solution Approach 2:
The patent employs composite material structure with PBAT as the base material and incorporates specific compounds (oleate compound in center area, ether compound in surface area) to enhance both functionality and biodegradability, creating a composite that resolves the contradiction between durability and environmental friendliness
2Productivity
If oxidative degradation additive is added to plastic wrap, then decomposition rate is improved, but heavy metal components cause secondary environmental damage
Solution Approach 1:
The patent extracts and eliminates the harmful oxidative degradation additives containing heavy metals from the plastic wrap composition, replacing them with PBAT-based materials that decompose through natural biological processes without generating harmful substances
Solution Approach 2:
The patent converts the harm of non-biodegradability into a benefit by using PBAT that is specifically designed to decompose rapidly in composting conditions, turning the previous environmental harm into accelerated beneficial decomposition within 180 days
3Object-affected harmful factors
If plastic wrap is designed to be compostable, then biodegradability is improved, but functional properties may be compromised
Solution Approach 1:
The patent applies local quality by placing different compounds in different areas: oleate compound in the center area and ether compound in the surface area, where each location receives the specific compound needed for its function, maintaining both biodegradability and functional properties
Solution Approach 2:
The patent changes the material parameters by using high-purity PBAT (>90 wt%) which inherently provides both compostability and good functional properties, eliminating the need for harmful additives while maintaining performance
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 compostable plastic wrap can be fully decomposed within 180 days, maintaining good functional properties and avoiding secondary environmental pollution, as certified by EN13432/ASTM D6400 and Din Certco/BPI standards.
Implementation Method 1
the center area contains an oleate compound, or the surface area contains an ether compound... the compostable plastic wrap can be fully decomposed within 180 days
Data Source
AI summary
A compostable plastic wrap is provided. Based on a total weight of the compostable plastic wrap being 100 wt %, a material of the compostable plastic wrap includes more than 90 wt % of polybutylene adipate terephthalate. In a cross-sectional structure of the compostable plastic wrap, the compostable plastic wrap has a center area and a surface area. The center area is completely encapsulated by the surface area. The center area contains an oleate compound, or the surface area contains an ether compound.