Hydrophobic Paper Sizing Stability via Modified Polyamides
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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 require 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 by adjusting the pH below 4.0 and homogenizing the mixture, creating a stable and efficient dispersion for paper sizing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydrophobic sizing agents are used to provide resistance to aqueous penetrants, then sizing efficiency is improved, but stability of the aqueous dispersion deteriorates
Solution Approach 1:
The patent introduces hydrophobically modified poly(aminoamide) as an intermediary dispersing agent that bridges the hydrophobic sizing agent and aqueous environment. This mediator has both hydrophilic and hydrophobic characteristics, allowing it to stabilize the dispersion without compromising either the aqueous compatibility or the sizing agent's effectiveness.
Solution Approach 2:
The patent modifies the chemical parameters of the poly(aminoamide) by introducing hydrophobic groups through alkyl glycidyl ether modification. This parameter change enables the polymer to interact with both aqueous and hydrophobic phases, resolving the contradiction between stability and sizing efficiency.
2Stability of the object's composition
If conventional starch-based stabilizers are used to maintain dispersion stability, then storage stability is improved, but sizing efficiency deteriorates
Solution Approach 1:
The patent replaces conventional starch-based stabilizers with hydrophobically modified poly(aminoamide). While starch is a traditional, readily available stabilizer, the modified poly(aminoamide) provides superior and more durable stabilization that maintains sizing efficiency throughout the papermaking process and storage period.
3Stability of the object's composition
If additional stabilizers and surfactants are added to maintain dispersion stability, then storage stability is improved, but device complexity increases
Solution Approach 1:
The hydrophobically modified poly(aminoamide) serves multiple functions simultaneously: it acts as a dispersing agent, a stabilizer, and a retention aid. This multi-functionality eliminates the need for separate stabilizers and surfactants, reducing formulation complexity while maintaining storage stability.
Solution Approach 2:
The patent merges the functions of dispersing agent, stabilizer, and retention aid into a single hydrophobically modified poly(aminoamide) component. This consolidation simplifies the overall formulation by eliminating the need for multiple separate additives.
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 approach results in enhanced stability and sizing efficiency of paper sizing agents, reducing the amount of active hydrophobic sizing agent required and improving retention and distribution on paper surfaces, with the alkyl glycidyl ether modified poly(aminoamides) providing a more effective and stable dispersion compared to conventional starch-based systems.
Implementation Method 1
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
Implementation Method 2
alkyl glycidyl ether modified poly(aminoamides), which serves as the dispersing agent for the finely-divided particles in water
Implementation Method 3
the emulsions must include a means of retaining the hydrophobic particles on the fiber surfaces
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.