Super Absorbent Polymer Surface Chemistry for Fast Liquid Uptake
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Solution Overview
Problem
Super absorbent polymers used in pulpless hygiene products face challenges in maintaining high absorbency and fast absorption rates without the use of foaming agents, which often degrade physical properties such as surface tension, liquid permeability, and bulk density, and result in increased fine particle generation.
Innovation Solution
A polyacrylic acid (salt)-based super absorbent polymer is developed with controlled ratios of functional groups like COOH and COO-functional groups on its surface, adhering to specific FT-IR derived ratios to enhance absorption properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a foaming agent is used to form a porous structure in the super absorbent polymer, then the surface area is increased and absorption properties are enhanced, but the physical properties such as surface tension, liquid permeability, and bulk density decrease, and fine particle generation increases
Solution Approach 1:
The patent removes the foaming agent from the monomer composition entirely, eliminating the source of physical property degradation and fine particle generation while maintaining the goal of creating a porous structure through alternative means that do not compromise polymer integrity
Solution Approach 2:
The patent optimizes the compositional parameters of the monomer mixture, specifically controlling the ratios of acrylic acid, acrylamide, and crosslinking agents, along with processing parameters like polymerization temperature and time, to achieve enhanced absorption properties without relying on foaming agents that degrade physical properties
2Length of stationary object
If the pulp content is reduced or eliminated to make hygiene products thinner, then the product thickness is reduced, but the proportion of super absorbent polymers must be increased which demands higher absorbency and faster absorption rates
Solution Approach 1:
The patent modifies the chemical composition parameters of the super absorbent polymer by adjusting monomer ratios and crosslinking conditions to achieve higher absorbency and faster absorption rates, enabling thinner product design without compromising absorption performance
Solution Approach 2:
The patent creates a composite polymer system combining acrylic acid and acrylamide with specific crosslinking agents to achieve synergistic effects that enhance both absorption capacity and absorption rate, allowing reduced pulp content while maintaining overall product 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 polymer achieves improved absorption characteristics, including faster absorption rates and better properties under pressure, while minimizing extractable contents and maintaining liquid permeability, thus enhancing performance in hygiene products and other applications.
Implementation Method 1
super absorbent polymers are synthetic polymer materials capable of absorbing 500 to 1,000 times its own weight in water
Implementation Method 2
the super absorbent polymers need to essentially exhibit high absorbency as well as a fast absorption rate
Implementation Method 3
the most common approach involves forming a porous structure in a super absorbent polymer, thereby increasing a surface area
Implementation Method 4
a spectrum derived from analyzing the surface of the super absorbent polymer via Fourier-transform infrared spectroscopy (FT-IR)
Data Source
AI summary
Provided is a super absorbent polymer, which is a polyacrylic acid (salt)-based super absorbent polymer, and comprises carbon, oxygen, and silicon on a surface thereof,wherein a spectrum derived from analyzing the surface of the super absorbent polymer via Fourier-transform infrared spectroscopy (FT-IR) satisfies Equation 1:XCOOH≤2.6[Equation 1]wherein in Equation 1,XCOOH is a value determined by dividing an integrated value of a region corresponding to a COOH functional group within the spectrum by an integrated value of a region corresponding to a CH2 functional group within the spectrum.