Paper Sizing Composition With Poly(Aminoamide) Dispersion Stability
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Solution Overview
Problem
Existing aqueous dispersions of hydrophobic paper sizing agents, such as rosin and AKD, face challenges in stability and efficiency due to the hydrophobic nature of these materials, which are insoluble in water, requiring additional stabilizers and surfactants to maintain stability and effectiveness during transportation and application in papermaking processes.
Innovation Solution
The use of hydrophobically modified poly(aminoamides, specifically alkyl glycidyl ether modified poly(aminoamides), as dispersing agents to stabilize and enhance the stability and sizing efficiency of hydrophobic paper sizing agents, allowing for improved retention and distribution on paper fibers, with pH adjustment below 4.0 for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrophobic sizing agents (rosin, AKD, ASA) are used to provide sizing resistance, then sizing efficiency is improved, but water solubility and stability deteriorate due to their hydrophobic nature
Solution Approach 1:
The patent introduces hydrophobically modified poly(aminoamides) as intermediary dispersing agents that bridge the hydrophobic sizing agents and water. These polymers contain both hydrophobic regions (alkyl chains from glycidyl ether modification) that associate with the hydrophobic sizing agents and hydrophilic regions that interact with water, thereby enabling stable aqueous dispersions while maintaining sizing efficiency
Solution Approach 2:
The invention creates composite aqueous dispersion systems combining hydrophobic sizing agents (rosin, AKD, or ASA) with hydrophobically modified poly(aminoamides) as dispersing agents. This composite approach allows the hydrophobic sizing agents to retain their sizing functionality while the poly(aminoamide) component provides water compatibility and stability through its amphiphilic structure
2Stability of the object's composition
If additional stabilizers and surfactants are added to maintain stability of hydrophobic sizing agents, then water stability is improved, but system complexity and cost increase
Solution Approach 1:
The hydrophobically modified poly(aminoamides) serve multiple functions simultaneously: they act as dispersing agents to distribute hydrophobic sizing agents in water, as stabilizers to prevent phase separation during storage and transport, and as retention agents to hold sizing agents on fiber surfaces. This multi-functionality eliminates the need for separate stabilizers and surfactants, simplifying the overall system
Solution Approach 2:
The invention modifies the poly(aminoamide) polymer structure by introducing hydrophobic alkyl groups through glycidyl ether modification. This structural parameter change enables the polymer to interact with both hydrophobic sizing agents and water, providing stabilization without requiring additional chemical additives or complex formulation systems
3Quantity of substance
If high solids content is used in dispersions to minimize shipping cost, then transportation efficiency is improved, but storage stability deteriorates over time
Solution Approach 1:
The hydrophobically modified poly(aminoamides) act as intermediary dispersing agents that enable high solids content dispersions to remain stable during storage. By providing steric and electrostatic stabilization through their amphiphilic structure, they prevent aggregation and phase separation even at elevated concentrations, allowing the dispersion to maintain both high solids content and long-term storage stability
4Ease of manufacture
If conventional starch-based stabilization systems are used, then ease of manufacture is improved, but sizing efficiency and stability deteriorate
Solution Approach 1:
The invention changes the chemical structure and properties of the dispersing agent from conventional starch-based systems to hydrophobically modified poly(aminoamides). This parameter change in polymer chemistry provides both ease of manufacture through standard polymerization processes and superior performance through the amphiphilic nature of the modified poly(aminoamide), which enables better interaction with hydrophobic sizing agents
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 hydrophobically modified poly(aminoamides) provide stable and efficient aqueous dispersions of hydrophobic paper sizing agents, improving sizing efficiency by reducing the amount of active sizing agent required and maintaining stability over time, with smaller particle sizes and lower viscosity, leading to better retention and distribution in paper products.
Implementation Method 1
aqueous dispersions which contain finely-divided particles of the sizing agent and a hydrophobically-modified poly(aminoamide), particularly preferred is a water soluble alkyl glycidyl ether modified poly(aminoamide), which serves as the dispersing agent for the finely-divided particles in water
Implementation Method 2
a hydrophobically-modified poly(aminoamide), particularly preferred is a water soluble alkyl glycidyl ether modified poly(aminoamide), which serves as the dispersing agent for the finely-divided particles in water
Implementation Method 3
The novel aqueous dispersions of this invention exhibit enhanced efficiency when used to size paper
Data Source
AI summary
Disclosed is a sizing composition comprising a hydrophobic paper sizing agent and a hydrophobically modified poly(aminoamide). Also disclosed is a method of making the sizing composition and a method of using the sizing composition.