Itaconic Acid Copolymer Saline Water Absorption
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Solution Overview
Problem
Superabsorbent polymers exhibit significantly reduced water absorption rates in saline solutions compared to distilled water, leading to increased material requirements and product thickness in applications like diapers and sanitary pads.
Innovation Solution
A copolymer is developed using itaconamic acid or its salts combined with acrylic acid or its salts and acrylamide through a free radical polymerization process, which enhances water absorption capabilities by increasing the density of carboxylic and amino groups, allowing for better chelation and reduced common ion effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional superabsorbent polymers are used, then water absorption rate in distilled water is high (about 250 g/g), but water absorption rate in normal saline drops drastically to about 61 g/g or lower (35 g/g under pressure)
Solution Approach 1:
The patent modifies the chemical composition parameters of the superabsorbent polymer by incorporating itaconic acid (1-10 wt%) alongside acrylic acid and acrylamide in specific ratios. This parameter change in monomer composition alters the polymer's interaction with saline solutions, maintaining high water absorption rates (above 80 g/g in normal saline) by reducing the common ion effect through the unique molecular structure of itaconic acid units.
Solution Approach 2:
The invention creates a composite polymer structure combining three different monomer units: acrylic acid, acrylamide, and itaconic acid. This composite material approach leverages the synergistic effects of each monomer type, where itaconic acid specifically addresses the saline absorption problem while acrylic acid provides bulk absorption capacity and acrylamide enhances structural properties, achieving reliable performance in both distilled water and saline environments.
2Reliability
If more superabsorbent polymer is used to compensate for low saline absorption, then water absorption rate in saline improves, but product thickness and weight increase
Solution Approach 1:
By changing the chemical parameters of the polymer (incorporating itaconic acid at 1-10 wt%), the material achieves higher absorption efficiency in saline (above 80 g/g), reducing the total quantity of polymer needed in the product while maintaining reliable saline absorption performance, thus decreasing product weight.
Solution Approach 2:
The patent creates a more efficient absorption structure that copies and enhances the beneficial properties of conventional SAPs while eliminating their deficiency in saline environments. The optimized copolymer structure replicates the high absorption capability in distilled water while simultaneously achieving reliable absorption in saline, replacing the need for excessive material quantities.
3Ease of manufacture
If conventional superabsorbent polymers are used, then manufacturing process is simple, but seven times the amount of material is required to achieve the same absorption rate in saline
Solution Approach 1:
The patent modifies monomer composition parameters (adding itaconic acid at 1-10 wt%) to achieve seven-fold improvement in saline absorption efficiency. This parameter change maintains compatibility with conventional free radical polymerization processes, preserving ease of manufacture while dramatically reducing the quantity of polymer material needed in the final product.
4Reliability
If product thickness is increased to improve saline absorption capacity, then water absorption rate in saline improves, but product comfort and wearability deteriorate
Solution Approach 1:
By changing the chemical composition (incorporating itaconic acid), the polymer achieves high saline absorption rates with reduced material quantity, allowing thinner product design that maintains reliable saline absorption performance while improving comfort and wearability through reduced thickness.
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 copolymer achieves higher water absorption rates in both pure water and saline solutions, improving the performance of superabsorbent polymers by maintaining high water retention capacity and reducing material thickness in applications.
Implementation Method 1
the copolymer can be used as a great chelating agent, water-absorbing agent
Implementation Method 2
The copolymer has a high density of a carboxylic group and amino group, and therefore the copolymer can be used as a great chelating agent
Data Source
AI summary
In one embodiment of the disclosure, a copolymer and method for manufacturing the same are provided. The copolymer is copolymerized from a composition including: (a) a first hydrophilic monomer, including itaconamic acid, itaconamic salt, or combinations thereof; and (b) a second hydrophilic monomer, including acrylic acid, acrylic salt, acrylamide, or combinations thereof.