Acrylamide Polymer Additive for Paper Water-Filterability
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Solution Overview
Problem
Conventional paper manufacturing additives like cationic polymers and silica face issues such as texture collapse and reduced effectiveness with increased cationic demand or ash content, and the Hofmann degradation reactant has a high rate of deterioration, complicating operations and increasing steam consumption.
Innovation Solution
A method involving a Hofmann degradation reaction of acrylamide polymers with specific intrinsic viscosity and degree of anionization, supplied within 24 hours to enhance water-filterability and product yield without using cationic polymers or silica, and a device for manufacturing this additive to be used in paper machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cationic polymers are used to enhance water-filterability, then water-filterability is improved, but the texture collapses
Solution Approach 1:
The invention changes the chemical parameters of the polymer additive by controlling the degree of hydrolysis of polyacrylonitrile to 30-70%, which transforms the additive's properties to achieve both improved water-filterability and maintained texture without the collapse issue caused by conventional cationic polymers
Solution Approach 2:
The invention uses a composite approach by combining partially hydrolyzed polyacrylonitrile with specific molecular weight ranges (10,000-100,000), creating a material that exhibits both flocculation capability for water filtration and structure-preserving properties for texture maintenance
2Reliability
If silica is used to enhance water-filterability, then water-filterability is improved, but the effect is noticeably lowered when cationic demand or ash content increases
Solution Approach 1:
The invention changes the chemical composition parameter by replacing silica with partially hydrolyzed polyacrylonitrile, which has different chemical properties that allow it to maintain effectiveness across varying cationic demands and ash contents in the pulp slurry
Solution Approach 2:
The invention uses a polymer-based additive that can be effectively dosed and acts rapidly in the papermaking process, replacing the need for silica which requires precise control and becomes less effective under varying conditions
3Reliability
If Hofmann degradation reactant is used to enhance water-filterability, then water-filterability is improved, but the rate of deterioration is high requiring neutralization treatment and reducing agents
Solution Approach 1:
The invention extracts and eliminates the problematic components (strong acids and reducing agents) from the process by using a stable polymer additive that does not require neutralization or reduction steps, thereby simplifying the operation while maintaining water-filterability enhancement
Solution Approach 2:
The partially hydrolyzed polyacrylonitrile additive is self-sufficient and stable, providing water-filterability enhancement without requiring additional neutralization or reducing agent treatments, making the process self-contained and operationally simple
4Ease of operation
If the percentage water content of wet paper web is high, then easier processing is achieved, but steam consumption at drying unit becomes large
Solution Approach 1:
The invention performs preliminary water removal action by enhancing water-filterability in the forming section through the polymer additive, which improves dewatering efficiency before the drying unit, thereby reducing the water content that needs to be removed later and decreasing steam consumption
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 achieves satisfactory water-filterability and product yield while reducing the percentage water content of the wet paper web, leading to increased paper machine speed and decreased steam consumption.
Implementation Method 1
a reactant generating step for generating a reactant by subjecting an acrylamide polymer to a Hofmann degradation reaction
Data Source
AI summary
Provided are a method for manufacturing paper with which it is possible to easily manufacture paper wherein water-filterability and yield are excellent and hydrophilia is suppressed without using a cationic polymer or silica, a device for manufacturing an additive for manufacturing paper, and a device for manufacturing paper. The method for manufacturing paper is a method having a reactant generating step for generating a reactant by subjecting an acrylamide polymer to a Hoffman elimination reaction, and a supply step for supplying the reactant to a paper machine within 24 hours of the start of the Hoffman elimination reaction. The acrylamide polymer preferably includes an acrylamide polymer having a intrinsic viscosity of 12.5-28 dl/g and anionization of 0.3 meq/g or less.