Polyacrylamide Resin for Papermaking Additive

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Solution Overview

Problem

The existing papermaking additives do not adequately enhance the internal bond strength and water filtering properties of paper, limiting their productivity and efficiency.

Innovation Solution

A polyacrylamide resin comprising specific units, such as diallylamine and glyoxylic acid-modified acrylamide, is used to improve the internal bond strength and water filtering properties of paper by forming a polymer with controlled molecular weight and viscosity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional papermaking additives (amphoteric polymer compounds) are used, then water filtering property is improved, but internal bond strength is insufficient

Engineering Contradiction:

Improvewater filtering propertyVSAvoidinternal bond strength

Core Design Contradiction:

ProductivityVSStrength

Solution Approach 1:

The invention uses a copolymer containing both cationic units (diallylamine or diallyldimethylammonium) and anionic units (glyoxylic acid-modified acrylamide) in a specific structure. This composite polymer structure allows simultaneous improvement of water filtering property (through cationic charge interaction with pulp) and internal bond strength (through anionic group bonding with fillers), resolving the contradiction between these two properties.

Inventive Principle:

Principle #40Composite materials

2Strength

If polyacrylamide resin with high molecular weight is used, then strength is improved, but viscosity increases affecting processability

Engineering Contradiction:

Improvepaper strengthVSAvoidviscosity

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The invention optimizes the molecular weight of the polyacrylamide resin to a specific range (weight average molecular weight: 1,000,000 to 10,000,000) and controls the ratio of cationic to anionic units. This parameter optimization achieves adequate strength improvement while maintaining viscosity at manageable levels for papermaking processes, resolving the contradiction between strength and processability.

Inventive Principle:

Principle #35Parameter changes

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 polyacrylamide resin significantly enhances the internal bond strength and water filtering properties of paper, resulting in improved productivity and paper quality.

Implementation Method 1

a polyacrylamide resin having at least one kind of a first unit represented by the following formulas (1) to (4) and a second unit represented by the following formula (5)

Methodology Applied

Scientific EffectCopolymerization: Chemical Bonding

Data Source

PatentEP3354666B1Use of an polyacrylamide resin as papermaking additive and paper

Publication Date: 2021.03.10 HARIMA CHEM INC

AI summary

A polyacrylamide resin has at least one kind of a first unit represented by the following formulas (1) to (4) and a second unit represented by the following formula (5). (In the above-described formulas (1) to (4), R1 represents a hydrogen atom, a methyl group, an ethyl group, or a benzyl group; R2 and R3 are independent and represent a hydrogen atom, a methyl group, an ethyl group, or a benzyl group; and X represents an anion.) (In the above-described formula (5), R4 represents a hydrogen atom or a methyl group and R5 represents a hydrogen atom, an alkali metal ion, or an ammonium ion.)