Polyvinylamine Polymer Dry Strength Paper Manufacturing
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Solution Overview
Problem
Existing paper manufacturing processes using Hofmann degradation products face challenges such as reduced applicative performances due to decreased viscosity of base polymers, limited molecular weight, and saturated performance levels.
Innovation Solution
A polyvinylamine polymer is synthesized through a method involving multiple gradient polymerization steps and a Hofmann degradation reaction, which increases the molecular weight of the base polymer without affecting its viscosity, thereby enhancing dry strength and drainage properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If Hofmann degradation is applied to improve dry strength and drainage performance, then cationicity increases, but viscosity of the base polymer decreases leading to reduced applicative performances
Solution Approach 1:
The patent changes the molecular weight parameter of the base polymer to a higher range (10^6-10^7 g/mol) while maintaining viscosity through specific polymerization conditions. This parameter change allows the degraded polymer to retain sufficient viscosity for application while providing enough molecular weight to generate high cationicity and dry strength performance after Hofmann degradation.
2Strength
If molecular weight of base polymer is increased to improve dry strength, then performance increases, but viscosity may be affected negatively
Solution Approach 1:
The patent optimizes the molecular weight parameter to a specific range (10^6-10^7 g/mol) and controls polymerization parameters (temperature, initiators, monomer ratios) to achieve the desired balance between molecular weight and viscosity, ensuring both high dry strength potential and good applicability.
Solution Approach 2:
The patent uses composite monomer systems including cationic monomers (A), non-ionic monomers (B), and structuring systems (I and II) that work together to create a polymer with optimized molecular weight and viscosity characteristics that maintain applicability while providing high performance after degradation.
3Strength
If degradation degree is increased to improve cationicity, then dry strength improves, but molecular weight decreases limiting drainage and flocculation applications
Solution Approach 1:
The patent applies partial Hofmann degradation (Alpha coefficient of 0.1-1.0) rather than complete degradation, which is sufficient to generate the required cationicity for dry strength while preserving enough molecular weight (10^6-10^7 g/mol) to maintain drainage and flocculation capabilities.
4Strength
If polymer concentration is increased to improve performance, then dry strength increases, but amount of polymer needed increases leading to higher costs and emissions
Solution Approach 1:
The patent changes the molecular weight parameter to higher values (10^6-10^7 g/mol), which increases the polymer's efficiency per unit mass. This allows achieving the same or better dry strength performance with lower polymer concentrations, reducing both costs and environmental emissions.
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 resulting polyvinylamine polymer improves dry strength and drainage performance, allowing for increased paper machine speed and productivity, while also reducing the amount of polymer needed and associated greenhouse gas emissions.
Implementation Method 1
A polyvinylamine polymer resulting from the Hofmann degradation reaction on a base polymer
Data Source
AI summary
This invention relates to a new polyvinylamine polymer, its preparation method and use, specifically for application in the field of paper manufacturing.