Starch-Based Biodegradable Composition Moisture Resistance
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Solution Overview
Problem
Conventional disposable food service items made from starch-based materials are moisture-sensitive, limiting their use in aqueous environments and requiring costly biodegradable coatings, while traditional mineral fillers are not biodegradable, posing environmental concerns.
Innovation Solution
Development of biodegradable, starch-based compositions incorporating natural fibers and additives like epoxidized vegetable oils, poly(vinyl acetate), and poly(ethylene-vinyl acetate) copolymers to create water-resistant, compostable, and edible articles with improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If starch-based materials are used for disposable food service items, then biodegradability and compostability are improved, but moisture resistance deteriorates
Solution Approach 1:
The patent applies composite materials by combining starch with natural fibers (cellulose, hemicellulose, lignin) and hydrophobic additives (waxes, oils, resins) to create a material that maintains biodegradability while gaining moisture resistance. The composite structure allows the starch matrix to provide biodegradability while the hydrophobic components provide water repellency.
Solution Approach 2:
The patent changes the chemical parameters of the starch material by incorporating hydrophobic substances that modify its surface properties and bulk characteristics. This allows the material to transition from being hydrophilic to having moisture-resistant properties while retaining its biodegradable nature.
2Reliability
If biodegradable coatings are applied to starch-based items, then moisture resistance is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the functions of the starch matrix and the hydrophobic protective components into a single integrated material system. Instead of applying separate coatings, the hydrophobic substances are incorporated directly into the starch matrix during manufacturing, combining structural and protective functions in one material.
Solution Approach 2:
The patent creates a multi-functional material where the starch provides biodegradability and structural integrity, while the incorporated hydrophobic substances provide moisture resistance. This eliminates the need for separate coating applications and reduces manufacturing complexity.
3Strength
If conventional mineral fillers are used in starch-based compositions, then mechanical properties are improved, but biodegradability deteriorates
Solution Approach 1:
The patent changes the compositional parameters by replacing inorganic mineral fillers with organic natural fiber components. This substitution maintains or improves mechanical properties through the fibrous structure while ensuring complete biodegradability of the final product.
Solution Approach 2:
The patent creates a composite material system using natural fibers (cellulose, hemicellulose, lignin) that provide mechanical reinforcement similar to mineral fillers but with the advantage of being fully biodegradable. The natural fiber composite structure delivers the needed strength and stiffness.
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 biodegradable, water-resistant, and compostable food service items that can withstand moisture, reducing environmental impact and manufacturing costs, while maintaining desired physical properties and safety for consumption.
Implementation Method 1
the additive component can comprise an epoxidized vegetable oil, a hydrogenated triglyceride, poly(vinyl acetate), poly(vinyl acetate-ethylene) copolymer, poly(ethylene-vinyl acetate) copolymer, or a combination thereof
Implementation Method 2
Biodegradable and compostable composition having improved physical and chemical properties
Data Source
AI summary
The present application is generally directed to novel compositions and methods used to produce a biodegradable, starch-based, water-resistant article of manufacture. The teachings include a composition comprising a biodegradable fiber component in an amount ranging from about 5% to about 40% on a dry weight basis, starch component in an amount ranging from about 40% to about 94.5% on a dry weight basis, and an additive component in an amount ranging from more than 0% to about 15% on a dry weight basis. The additive component can comprise an epoxidized vegetable oil, a hydrogenated triglyceride, poly(vinyl acetate), poly(vinyl acetate-ethylene) copolymer, poly(ethylene-vinyl acetate) copolymer, or a combination thereof.