Superabsorbent Polymer Network Saline Absorbency
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Solution Overview
Problem
Current superabsorbent polymers (SAPs) exhibit low water absorbency in salt-containing and pressurized solutions due to low crosslinking density and mechanical strength, limiting their effectiveness in saline and pressurized environments.
Innovation Solution
A SAP network is developed using specific monomers and crosslinkers, including itaconic acid and acrylic acid, with a controlled ratio and bonding mechanism to enhance water absorbency, comprising copolymers and homopolymers bonded by two crosslinkers, which are prepared through a polymerization and crosslinking process, and the ratio of monomeric moieties is determined using hydrolysis and spectroscopic methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional SAP networks are used, then they show high water absorbency in deionized water, but their water absorbency drops significantly in salt-containing and pressurized solutions
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a specific monomer ratio (8-23 mole % itaconic acid, 75-92 mole % acrylic acid) and controlled crosslinking density (0.1-1 mole % crosslinker) to optimize the SAP network's performance in saline and pressurized conditions while maintaining high water absorbency
Solution Approach 2:
The patent creates a composite SAP network combining multiple monomers (itaonic acid, acrylic acid) and multiple crosslinkers to form a hybrid polymer structure that exhibits enhanced stability and absorbency in challenging environments compared to conventional single-component SAPs
2Quantity of substance
If itaconic acid copolymerization is used, then hydrophilicity and water absorbency are enhanced, but chain transfer reactions result in low-molecular-weight networks with low mechanical strength
Solution Approach 1:
The patent optimizes the crosslinker concentration (0.1-1 mole %) and monomer ratio to control the molecular weight and crosslinking density, achieving a balance between hydrophilicity and mechanical strength in the final SAP network
Solution Approach 2:
The patent creates local variations in crosslinking density within the SAP network, with regions of higher crosslinking providing mechanical strength and regions with lower crosslinking maintaining hydrophilicity and water absorbency
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 SAP network demonstrates unexpectedly high water absorbency in saline and pressurized solutions, outperforming comparative SAPs, with absorbency values significantly higher in both environments, maintaining high performance across various conditions.
Implementation Method 1
Itaconic acid has two polar carboxyl groups, which attribute to the hydrophilicity and thus water absorbency of the SAP network
Implementation Method 2
The copolymers thus formed are then crosslinked to form a SAP network
Implementation Method 3
The copolymers thus formed are then crosslinked to form a SAP network
Data Source
AI summary
A superabsorbent polymer network formed of two monomers and two crosslinkers. The monomers and the crosslinkers are described herein. Further, a method for preparing this superabsorbent polymer network is disclosed. Also disclosed is a method of determining a ratio between two monomeric moieties in a superabsorbent polymer network formed of two monomers.