Paper Water-Resistant Agent Defoaming via Polypropylene Glycol
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Solution Overview
Problem
Existing water- and oil-resistant agents for paper, particularly those using fluorine-containing copolymers with short chain polyfluoroalkyl groups, face issues with reduced water and oil resistance and stability due to bubble formation and product instability.
Innovation Solution
Incorporating a polypropylene glycol compound into an aqueous solution of a fluorine-containing copolymer, which includes specific fluorine-containing monomers and (meth)acrylate monomers, to enhance defoaming and prevent bubble formation, thereby maintaining product stability and improving water and oil resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyoxyethyleneglycol mono(meth)acrylate is used to improve water and oil resistance, then water and oil resistance is improved, but bubble formation increases and product stability deteriorates
Solution Approach 1:
The patent changes the chemical structure parameters of the polymer by using fluorine-containing (meth)acrylate monomers with specific fluoroalkyl group lengths (C1-C6) and combining them with cationic nitrogen-containing monomers in controlled ratios, thereby achieving both water/oil resistance and product stability without bubble formation
Solution Approach 2:
The patent creates a composite copolymer system combining fluorine-containing (meth)acrylate monomers with cationic nitrogen-containing monomers, where the synergistic interaction between the two monomer types provides both hydrophobicity for water/oil resistance and cationic character that prevents bubble formation and ensures product stability
2Reliability
If long chain Rf group is used to achieve water and oil resistance, then water and oil resistance is improved, but environmental harm increases due to PFOA production
Solution Approach 1:
The patent changes the carbon number parameter of the Rf group from long chain to short chain (C1-C6), which reduces the production of perfluoro-octanoic acid and environmental harm while maintaining adequate water and oil resistance through optimized copolymer composition
Solution Approach 2:
The patent applies local quality by using fluorine-containing monomers with specific fluoroalkyl group lengths (C1-C6) rather than uniform long chain structures, creating localized hydrophobicity that provides sufficient water and oil resistance without the environmental drawbacks of long chain Rf groups
3Object-affected harmful factors
If short chain Rf group is used to reduce environmental harm, then environmental harm is reduced, but water and oil resistance deteriorates
Solution Approach 1:
The patent creates a composite copolymer system where short chain Rf groups (C1-C6) are combined with cationic nitrogen-containing monomers, and the synergistic interaction between these components provides sufficient water and oil resistance despite the shorter fluoroalkyl chain length
Solution Approach 2:
The patent optimizes multiple parameters simultaneously including the ratio of fluorine-containing monomer to cationic monomer, the specific fluoroalkyl group length (C1-C6), and the degree of polymerization, thereby achieving adequate water and oil resistance with short chain Rf groups that are environmentally friendly
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 provides a water- and oil-resistant agent with reduced bubble formation and improved stability, achieving superior water and oil resistance for treated paper.
Implementation Method 1
when a composition comprising at least one polypropylene glycol or derivatives thereof (i.e., a polypropylene glycol compound) is added to an aqueous solution of a fluorine-containing copolymer, the aqueous solution exhibits a superior defoaming effect and a superior bubble prevention effect
Implementation Method 2
The copolymer composition comprising a long chain C6-C12 polyfluoroalkyl group (hereinafter referred to as 'Rf group') has been utilized previously as the water- and oil-resistant agent for paper
Data Source
AI summary
Provided is a water-resistant/oil-resistant agent for paper that exhibits little foam formation and excellent product stability. The water-resistant/oil-resistant agent for paper comprises: (I) (a) a fluorine-containing monomer that has a fluoroalkyl group and that is represented by general formula (1) (General formula (1): CH2=C(-X)-C(=O)-Y-Z-Rf [In the formula, X is a hydrogen atom, a linear or branched alkyl group having 1-21 carbon atoms, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, or the like. Y is -O- or -NH-. Z is an aliphatic group having 1-10 carbon atoms, an aromatic group having 6-10 carbon atoms, a cycloaliphatic group, or the like. Rf is a linear or branched fluoroalkyl group having 1-6 carbon atoms.]) and (b) a fluorine-containing copolymer that includes, as a necessary component, a repeating unit derived from a (meth)acrylate monomer containing no fluorine atoms; and (II) a polypropylene glycol compound.