Crosslinked Polymer Composition for Paper Strength and Ash Retention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing papermaking technologies face challenges in achieving optimal strength and ash retention in paper products, particularly in enhancing dry and wet strength while maintaining efficient dewatering performance.
Innovation Solution
A method involving the reaction of a cationic dialdehyde-modified polyacrylamide polymer with an amphoteric polymer to form a crosslinked polymer, which is then added to a pulp furnish after monitoring pH and turbidity, forming a crosslinked polymer with specific molecular weight and monomer ratios, and adjusting pH to enhance crosslinking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional dry strength aids (polyacrylamide, glyoxalated polyacrylamide) are used to improve paper strength, then dry strength and wet strength are enhanced, but ash retention and dewatering performance deteriorate
Solution Approach 1:
The patent applies composite materials by combining cationic dialdehyde-modified polyacrylamide polymer with amphoteric polymer to create a crosslinked polymer composite. This composite structure integrates the strength-enhancing properties of polyacrylamide with the retention-improving properties of amphoteric polymers, achieving both high dry strength and improved ash retention simultaneously rather than the trade-off presented by conventional single-component strength aids
Solution Approach 2:
The patent employs parameter changes by adjusting the pH of the mixture to values from about 7.5 to about 14 (optimally 9.0-10.0) to enhance crosslinking between the cationic dialdehyde-modified polyacrylamide and amphoteric polymer. This pH adjustment optimizes the chemical reaction conditions to form the crosslinked structure that delivers both strength and retention benefits, transforming the physical-chemical parameters of the system to achieve superior performance
2Strength
If conventional dry strength aids are used to enhance paper strength, then wet strength is improved, but dewatering performance worsens
Solution Approach 1:
The crosslinked polymer composite combines the wet strength properties of cationic dialdehyde-modified polyacrylamide with the dewatering enhancement properties of amphoteric polymer. The synergistic interaction in the composite material provides both improved wet strength and maintained dewatering performance, resolving the contradiction between these two parameters
Solution Approach 2:
The amphoteric polymer acts as an intermediary that mediates between the strength-enhancing cationic polyacrylamide and the pulp furnish. It facilitates improved ash retention and dewatering performance while the crosslinked structure provides the strength benefits, serving as a bridge that reconciles the conflicting requirements of wet strength and dewatering performance
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 method significantly increases the strength and ash retention of paper products, providing improved dry strength and maintaining superior dewatering performance.
Implementation Method 1
reacting a cationic dialdehyde-modified polyacrylamide polymer with an amphoteric polymer to form a mixture; monitoring a pH of the mixture; optionally adjusting a pH of the mixture to a value from about 7.5 to about 14; holding the mixture at the value for a period of time to form a crosslinked polymer
Data Source
AI summary
The present disclosure provides compositions and methods for increasing the strength of paper. Some of the methods include reacting a cationic dialdehyde-modified polyacrylamide polymer with an amphoteric polymer to form a mixture, monitoring a pH of the mixture, optionally adjusting the pH of the mixture to a value from about 7.5 to about 14, holding the mixture at the value for a period of time to form a crosslinked polymer, and adding the crosslinked polymer to a pulp furnish.