Oil-Resistant Paper Coating Using Modified Starch and PVA
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Solution Overview
Problem
Existing oil-resistant papers, including those using fluorine-based and polyvinyl alcohol-based compounds, fail to provide adequate oil and water resistance, posing safety and environmental concerns due to the generation of harmful fluorine compounds under high-temperature conditions.
Innovation Solution
A coating agent comprising a carboxy group-containing polyvinyl alcohol-based resin, a polyamide polyamine epihalohydrin-based crosslinking agent, and modified starch is used to create a highly safe and environmentally friendly oil-resistant paper with enhanced oil and water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluorine-based oil-resistant agent is used to impart oil resistance to paper, then oil resistance is improved, but harmful fluorine compounds are generated under high-temperature conditions causing safety and environmental problems
Solution Approach 1:
The patent removes the fluorine-based oil-resistant agent from the system and replaces it with a polyvinyl alcohol-based compound. This extraction of the harmful substance eliminates the generation of harmful fluorine compounds while maintaining the desired oil resistance function through the alternative material.
Solution Approach 2:
The patent changes the chemical composition parameter of the oil-resistant coating from fluorine-based to polyvinyl alcohol-based. This parameter change fundamentally alters the material properties to eliminate harmful emissions under high-temperature conditions while preserving the oil resistance function.
2Object-generated harmful factors
If a polyvinyl alcohol-based compound is used instead of fluorine-based agent, then safety and environmental friendliness are improved, but oil resistance and water resistance are insufficient
Solution Approach 1:
The patent creates a composite coating system combining polyvinyl alcohol-based resin with specific additives and processing conditions. This composite approach enhances the inherent properties of polyvinyl alcohol to achieve adequate oil and water resistance while maintaining safety and environmental benefits.
Solution Approach 2:
The patent optimizes parameters such as degree of saponification (85-100%) and average degree of polymerization (500-2500) of the polyvinyl alcohol-based compound. These parameter changes transform the material properties to achieve both safety and sufficient oil/water resistance simultaneously.
3Reliability
If a coating layer is provided on paper to impart oil resistance, then oil resistance is improved, but the coating layer may generate harmful compounds under high-temperature cooking or incineration conditions
Solution Approach 1:
The patent employs a polyvinyl alcohol-based coating that is designed to decompose safely under high-temperature conditions unlike fluorine-based materials. The material serves its protective function during normal use and then decomposes without generating harmful compounds during disposal or incineration, aligning with the principle of safe, temporary protective layers.
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 coating agent forms a layer that provides excellent oil and water resistance, making the oil-resistant paper suitable for packaging food items with oil and fat components, while being safe and environmentally friendly, and maintains resistance even under heat exposure.
Implementation Method 1
a crosslinking agent
Implementation Method 2
a carboxy group-containing polyvinyl alcohol-based resin
Implementation Method 3
a modified starch
Data Source
AI summary
A coating agent is disclosed containing a carboxy group-containing polyvinyl alcohol-based resin, a crosslinking agent, and a modified starch. Also disclosed is an oil-resistant paper including a layer containing the coating agent.