Fluorine-Free Coating Composition for Paper
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing water- and oil-resistant coatings for paper products often rely on fluorine-containing substances, which are difficult to decompose and pose environmental and health risks due to bioaccumulation and toxicity.
Innovation Solution
A fluorine-free water- and oil-resistant coating composition is developed, comprising biodegradable polymers, crosslinking agents, nanoparticles, plasticizers, surfactants, and antifoaming agents, which provides both water resistance and grease resistance without using fluorine-containing substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorine-containing substances are used to make paper water- and oil-resistant, then water resistance and oil resistance are improved, but environmental toxicity and bioaccumulation increase
Solution Approach 1:
The patent removes fluorine-containing substances from the coating composition entirely, extracting the harmful element while maintaining the essential water and oil resistance functions through alternative non-fluorine based polymers and additives
Solution Approach 2:
The patent changes the chemical composition parameters by substituting fluorine-containing polymers with fluorine-free polymers, altering the molecular structure to eliminate toxic properties while preserving the hydrophobic and oleophobic characteristics needed for water and oil resistance
2Reliability
If fluorine-containing substances are used to make paper water- and oil-resistant, then water resistance and oil resistance are improved, but biodegradability deteriorates
Solution Approach 1:
The patent extracts fluorine-containing substances that prevent biodegradation and replaces them with biodegradable polymers that can be naturally decomposed, thereby maintaining water and oil resistance while enabling environmental biodegradability
Solution Approach 2:
The patent changes the chemical composition to use biodegradable polymers with specific molecular structures that allow enzymatic breakdown, transforming the stability parameter from permanent persistence to controlled biodegradation while preserving protective functions
3Reliability
If wax is used to make paper water- and oil-resistant, then water resistance and oil resistance are improved, but thermal stability deteriorates
Solution Approach 1:
The patent changes the coating material from wax to polymer-based compositions with higher thermal stability parameters, enabling the coating to maintain its water and oil resistance properties at elevated temperatures without deforming or degrading
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 fluorine-free coating composition effectively enhances the water resistance and grease resistance of paper products, while being eco-friendly and non-toxic, thus reducing the environmental impact and health risks associated with fluorinated compounds.
Implementation Method 1
The use of paper based food packaging is increasing as single-use plastic materials are in the process of being banned in various jurisdictions. Although paper is both biodegradable and recyclable, paper is not water- and oil-resistant. Wax, perfluroalkyl, and polyfluoroalkyl substances (PFAS) can be mixed with paper pulp or coated on paper to make the paper water- and oil-resistant.
Implementation Method 2
U.S. Pat. No. 8,992,733 B2 'Water and oil resistant agent for paper and paper treatment process' discloses a water- and oil-resistant agent for paper comprising a fluorine-containing copolymer obtained by copolymerizing a (meth)acrylate monomer having a polyfluoroalkyl group having 1 to 6 carbon atoms.
Implementation Method 3
0.1 wt % to 25 wt % of crosslinking agent
Data Source
AI summary
The present invention provides a fluorine-free water- and oil-resistant coating composition comprising 30 wt % to 97 wt % biodegradable polymer in dry weight, less than 25 wt % crosslinking agent in dry weight, less than 25 wt % nanoparticles, less than 15 wt % plasticizer, less than 15 wt % surfactant and less than 1 wt % antifoaming agent in dry weight. The fluorine-free water- and oil-resistant coating composition relates to green chemistry and demonstrates both water resistance and grease resistance.