Super Absorbent Polymer Morphology for Fast Absorption and Shape Stability
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Solution Overview
Problem
Super absorbent polymers (SAP) in pulpless products face challenges in maintaining shape in a swollen state and reducing fine particle amounts while enhancing absorption properties, particularly due to the use of foaming agents which affect surface tension, liquid permeability, and bulk density.
Innovation Solution
Control the diffusion coefficient of ethanol in SAP to a specific range (DSap/DE) ≤ 92.5% by adjusting polymer morphology and particle structure, using nuclear magnetic resonance (NMR) spectroscopy to optimize absorption characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a foaming agent is included in the monomer composition to form a porous structure, then the surface area of the super absorbent polymer is increased, but the overall properties such as surface tension, liquid permeability, and bulk density are reduced
Solution Approach 1:
The patent removes the foaming agent from the monomer composition entirely, extracting the harmful element that causes property deterioration while seeking alternative methods to achieve the desired porous structure through controlled polymerization conditions and crosslinking agents only
Solution Approach 2:
The patent changes the polymerization parameters including the use of specific crosslinking agents (N,N'-methylenebisacrylamide, N,N'-ethylenebisacrylamide) at controlled ratios (0.01-5 parts by weight based on 100 parts by weight of monomer), polymerization temperature (70-90°C), and time (6-12 hours) to achieve porous structure formation without foaming agents, thereby maintaining surface tension, liquid permeability, and bulk density
2Speed
If a foaming agent is used to create porous structure, then the absorption rate is improved, but the amount of fine particles increases
Solution Approach 1:
The patent extracts the foaming agent from the system to eliminate the source of fine particle generation, achieving absorption rate improvement through alternative porous structure formation mechanisms that do not rely on foam-based expansion
Solution Approach 2:
The patent adjusts polymerization parameters including monomer concentration (20-40 wt%), crosslinking agent ratio (0.01-5 parts by weight), polymerization temperature (70-90°C), and time (6-12 hours) to control particle morphology and size distribution, achieving fast absorption rate while minimizing fine particle formation through optimized network structure development
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
Improves absorption rate and performance by controlling ethanol diffusion coefficient, resulting in enhanced liquid permeability and maintaining shape stability with reduced fine particles.
Implementation Method 1
a super absorbent polymer (SAP) is a synthetic polymer material that can absorb 500 to 1,000 times its own weight in moisture
Implementation Method 2
The super absorbent polymer is a crosslinked polymer of a water-soluble ethylenically unsaturated monomer having an acidic group and an internal crosslinking agent
Implementation Method 3
DSap represents a diffusion coefficient of ethanol in the super absorbent polymer as measured by nuclear magnetic resonance (NMR) spectroscopy
Data Source
AI summary
A polyacrylic acid (salt)-based super absorbent polymer may satisfy Equation 1. In Equation 1, DSap is a diffusion coefficient of ethanol in the polyacrylic acid (salt)-based super absorbent polymer measured by nuclear magnetic resonance (NMR) spectroscopy, and DE is a diffusion coefficient of pure ethanol as measured by nuclear magnetic resonance spectroscopy.(DSap/DE)×100(%)≤92.5(%) [Equation 1]