Anionic Starch Composition for Paper Retention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing aqueous anionic starch compositions face challenges in achieving high dry matter content, stability, and viscosity retention over time, making them unsuitable for industrial use without cooking operations, especially in paper and board manufacturing where cationic adjuvants' receptivity is reduced due to recycled pulps' degradation.
Innovation Solution
Aqueous compositions combining soluble gelatinized anionic starch with nonionic or anionic insoluble starch, where the soluble starch is processed to achieve high charge densities through enzymatic hydrolysis and rapid cooling, and the insoluble starch is used in sufficient proportions to achieve stable, pumpable solutions with high dry matter content, facilitating their use as bulk adjuvants in paper production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If soluble gelatinized anionic starch is used alone, then the composition can be prepared without cooking operations, but the stability and viscosity retention over time deteriorates
Solution Approach 1:
The patent combines soluble gelatinized anionic starch with insoluble anionic starch to create a composite composition. The insoluble starch granules act as a stabilizing framework that prevents viscosity loss and maintains composition stability over time, while the soluble starch provides the desired ease of preparation without cooking operations.
2Productivity
If high dry matter content is achieved, then the efficiency and effectiveness in paper production improves, but the stability and pumpability deteriorates
Solution Approach 1:
The composite of soluble and insoluble starches enables high dry matter content while maintaining pumpability. The insoluble starch granules provide a suspended framework that prevents settling and maintains flow properties even at high concentrations, allowing efficient transport and application in paper production.
3Adaptability or versatility
If soluble gelatinized anionic starch is used, then the receptivity to cationic agents improves, but the charge density and stability deteriorates
Solution Approach 1:
The combination of soluble and insoluble anionic starches creates a synergistic effect where the soluble portion provides high receptivity to cationic agents through its available anionic charges, while the insoluble granules maintain overall charge density and compositional stability, preventing excessive charge neutralization and maintaining long-term stability.
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 compositions demonstrate improved stability and viscosity retention, enabling their use as effective retention and drainage agents in paper production, enhancing physical properties and receptivity to cationic agents, even in recycled pulps, with the ability to maintain high dry matter content and charge densities, thus overcoming previous limitations.
Implementation Method 1
the soluble starch is processed to achieve high charge densities through enzymatic hydrolysis
Implementation Method 2
the soluble starch is processed to achieve high charge densities through enzymatic hydrolysis and rapid cooling
Data Source
AI summary
An aqueous composition which is anionic in nature, includes at least one soluble gelatinized anionic starch and at least one insoluble anionic starch. A method of using the composition, in particular for the manufacture of a paper or of a flat board, and the paper or the flat board obtained therefrom, along with various industrial uses such as water treatment or the production of cosmetic products, are also described.