ASA Emulsion with Amine Polymer for Paper Sizing
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Solution Overview
Problem
Conventional papermaking processes face challenges in achieving effective sizing, particularly in resisting hydrophilic liquid penetration, due to the limitations of traditional sizing agents like alkenyl succinic anhydride (ASA), which are not water-soluble and require uniform suspension in pulp to impart hydrophobicity to paper fibers.
Innovation Solution
An oil-in-water emulsion comprising alkenyl succinic anhydride emulsified with a polymer containing primary or secondary amine monomers, such as diallylamine, is introduced into the papermaking process to enhance sizing performance, using polymers like diallylamine-acrylamide copolymers as emulsifiers, allowing for improved distribution and retention of ASA within paper fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If alkenyl succinic anhydride is used as a sizing agent to impart hydrophobicity to paper fibers, then resistance to liquid penetration is improved, but water solubility is poor requiring emulsion formulation
Solution Approach 1:
The patent uses an amine-containing polymer as an intermediary emulsifier to bridge the hydrophobic ASA and hydrophilic water. The polymer contains both hydrophobic regions that interact with ASA and hydrophilic regions that interact with water, enabling uniform suspension without requiring ASA to be water-soluble.
Solution Approach 2:
The patent changes the physical state of ASA from pure hydrophobic molecules to an emulsified state with controlled particle size distribution (0.1-10 micrometers). This parameter change in particle size and distribution, achieved through emulsification with the amine-containing polymer, allows adequate suspension and contact with fibers while maintaining hydrophobicity.
2Manufacturing precision
If ASA is suspended as an emulsion to improve contact with cellulosic fibers, then sizing effectiveness is improved, but uniform suspension is difficult to achieve
Solution Approach 1:
The patent controls the particle size distribution parameter of the emulsion to be within 0.1-10 micrometers, which optimizes suspension stability and fiber contact. This parameter control achieves uniform suspension without requiring complex formulation systems.
Solution Approach 2:
The amine-containing polymer provides localized emulsification activity at the interface between ASA droplets and water, creating stable micro-emulsions throughout the pulp slurry. This localized action at the molecular interface simplifies the overall formulation compared to complex multi-component systems.
3Stability of the object's composition
If traditional sizing agents are used to achieve high sizing levels, then structural stability in wet environments is improved, but the papermaking process complexity increases
Solution Approach 1:
The amine-containing polymer serves multiple functions simultaneously: it acts as an emulsifier for ASA, a sizing agent itself, and a dispersing agent for uniform distribution. This multi-functionality achieves high sizing levels and structural stability while simplifying the overall process by reducing the number of separate additives needed.
Solution Approach 2:
The patent merges the functions of emulsification and sizing into a single integrated system using the amine-containing polymer. Instead of separate emulsifier and sizing agent components, the polymer performs both roles, reducing process complexity while maintaining effective sizing.
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 use of alkenyl succinic anhydride emulsified with amine-containing polymers significantly improves paper sizing, enhancing resistance to liquid penetration and structural stability without significantly affecting particle size distribution, making it suitable for various paper products, including beverage and food packaging.
Implementation Method 1
an oil-in-water emulsion comprising alkenyl succinic anhydride emulsified with a polymer comprising at least one primary or secondary amine containing monomer
Implementation Method 2
ASA-containing materials are used to impart a degree of hydrophobicity to paper fibers during production, and an overall resistance to liquid absorption to the finished paper product
Data Source
AI summary
The present disclosure provides for a method of preparing and using an emulsion for treating a papermaking process. The emulsion is an oil-in-water emulsion of alkenyl succinic anhydride emulsified with a polymer comprising at least one primary or secondary amine containing monomer. The method comprises adding an oil-in-water emulsion to the papermaking process; wherein the oil-in-water emulsion comprises alkenyl succinic anhydride emulsified with a polymer comprising at least one primary or secondary amine containing monomer; and wherein the oil-in-water emulsion is added in an amount sufficient to improve sizing of the paper produced by the papermaking process. The primary or secondary amine may be a secondary amine comprising diallylamine, and the polymer may be a diallylamine-acrylamide copolymer.