Red Algae Fiber Barrier Coating for Oxygen and Moisture Resistance
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Solution Overview
Problem
Existing packaging papers lack effective biodegradable materials with superior oxygen and dehydration barrier properties, as conventional petrochemical-based coatings are non-biodegradable and wood-derived nanocellulose has poor dehydration properties.
Innovation Solution
Utilizing oval red algae fibers with specific dimensions and a preparation method involving sulfuric acid treatment and bleaching to create a barrier red algae fiber, which is then integrated into a barrier coating layer with polymers for enhanced barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyethylene (PE) coating is used to provide moisture resistance, then moisture barrier property is improved, but biodegradability deteriorates and environmental friendliness worsens
Solution Approach 1:
The invention changes the material parameter from petrochemical polyethylene to natural red algae fiber, transforming the coating material's chemical composition and origin while maintaining barrier functionality. This parameter change enables biodegradability without sacrificing moisture resistance, as red algae fiber inherently provides both barrier properties and environmental compatibility.
Solution Approach 2:
The invention uses composite material structure by combining red algae fiber with paper substrate, creating a hybrid material system where the natural fiber coating layer works synergistically with the paper base to provide enhanced moisture barrier properties while maintaining biodegradability throughout the entire structure.
2Object-generated harmful factors
If wood-derived nanocellulose is used as barrier material, then biodegradability is improved, but dehydration property deteriorates
Solution Approach 1:
The invention extracts and utilizes the beneficial properties of natural fibers (biodegradability) from red algae while eliminating the detrimental property (poor dehydration) found in wood-derived nanocellulose. This selective extraction approach allows obtaining only the advantageous characteristics needed for the application.
Solution Approach 2:
The invention changes the material source parameter from wood to red algae, which fundamentally alters the fiber's physical and chemical properties. Red algae fiber possesses inherent dehydration capabilities and excellent bonding properties that wood nanocellulose lacks, while maintaining biodegradability, thus resolving the contradiction through material substitution.
3Ease of manufacture
If ordinary pulp fibers are used for paper composition, then ease of manufacture is improved, but barrier property deteriorates
Solution Approach 1:
The invention segments the paper structure into two functional layers: the base paper layer made of ordinary pulp fibers for structural integrity and ease of manufacture, and the surface coating layer made of red algae fiber for barrier properties. This segmentation allows each layer to fulfill its specific function optimally without compromising the other.
Solution Approach 2:
The invention creates a composite paper structure where ordinary pulp fiber and red algae fiber work together in distinct layers. The base layer provides manufacturability and strength, while the red algae coating layer provides oxygen and water vapor barrier properties, achieving functional integration without complex processing.
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 resulting barrier coated paper and sheet exhibit superior oxygen barrier and dehydration properties compared to conventional wood-derived nanocellulose, offering a more environmentally friendly alternative with improved performance.
Implementation Method 1
adding 1,000 to 3,000 parts by weight of water to 100 parts by weight of a mixture of 0.1 to 5.0 wt % of sulfuric acid and 95 to 99.9 wt % of red algae, reacting the mixture at 60 to 120° C. for 1 to 5 hours to remove carrageenan
Implementation Method 2
adding 400 to 600 parts by weight of water and 0.5 to 5.0 parts by weight of a bleaching agent to 100 parts by weight of the red algae residue obtained at above (1), adjusting pH between 3 and 5, and then reacting the red algae residue at 60 to 95° C. for 0.5 to 5 hours to bleach and wash it
Data Source
AI summary
The present invention relates to a barrier red algae fiber, a method for preparing the same, and a barrier coated paper and a barrier sheet comprising the same. The barrier coated paper according to the present invention not only has better oxygen barrier properties and dehydration properties during a coating process than conventional wood derived nanocellulose, but is also environmentally friendly because it has biodegradable properties.