Biodegradable Polysaccharide Superabsorbent Polymer for Compact Absorbent Articles
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Solution Overview
Problem
Current superabsorbent polymers (SAPs) used in absorbent articles are often non-biodegradable and require additional components like cellulosic fiber, leading to environmental issues and bulky products that are not attractive to consumers.
Innovation Solution
Development of biodegradable polysaccharide-based superabsorbent polymers with crosslinks formed between crosslinking agents and carboxyl or carboxamide groups, which exhibit high Surge Index and Capacity Index values, reducing the need for cellulosic fiber and enhancing absorbency without increasing bulk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-biodegradable SAPs are used to achieve high absorbency, then absorbency performance is improved, but environmental impact worsens
Solution Approach 1:
The patent changes the chemical composition parameters by using polysaccharide-based polymers (starch, cellulose, chitosan, alginate) instead of conventional non-biodegradable SAPs. This parameter change maintains high absorbency performance while achieving biodegradability, thus resolving the contradiction between absorbency and environmental impact.
Solution Approach 2:
The patent creates composite SAP materials by combining polysaccharide-based polymers with crosslinking agents and functional groups (carboxyl, carboxamide). This composite approach enables the material to achieve both high absorbency capacity and biodegradability, as the natural polysaccharide backbone provides environmental compatibility while the crosslinked network maintains structural integrity and absorbent properties.
2Quantity of substance
If cellulosic fiber is added to improve absorbency, then absorbency capacity is increased, but article bulk increases
Solution Approach 1:
The patent extracts and eliminates the need for cellulosic fiber fillers by developing polysaccharide-based SAPs that provide sufficient absorbency on their own. The crosslinked polysaccharide network achieves high absorbency capacity without requiring additional bulk-filled components, thus reducing article thickness while maintaining absorbency performance.
Solution Approach 2:
The patent changes the density and packing parameters of the SAP particles through controlled crosslinking and functional group modification. This creates a more compact particle structure that maintains high absorbency capacity per unit volume, eliminating the need for bulky cellulosic fiber additives.
3Strength
If crosslinks are formed between crosslinking agent and carboxyl groups to improve structural stability, then mechanical robustness is improved, but absorbency capacity may be reduced
Solution Approach 1:
The patent applies local quality by forming crosslinks specifically at carboxyl and carboxamide functional groups rather than uniformly throughout the polymer structure. This localized crosslinking provides mechanical stability at the molecular level while preserving the overall chain flexibility and water-accessible pathways needed for high absorbency capacity.
Solution Approach 2:
The patent optimizes the crosslinking density and type parameters to achieve the right balance between mechanical strength and absorbency. By controlling the amount and nature of crosslinks (e.g., using different crosslinking agents and conditions), the patent maintains both structural integrity and high absorbency capacity, resolving the contradiction between these two properties.
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 biodegradable SAPs provide superior absorbency and mechanical robustness, are age-stable, and toxicologically safe, allowing for thinner, more compact absorbent articles with reduced environmental impact.
Implementation Method 1
one or more crosslinks formed between a crosslinking agent and one or more carboxyl groups and/or carboxamide groups of the polysaccharide-based polymer
Implementation Method 2
Superabsorbent polymers (SAPs) are used in various articles, such as absorbent articles like diapers
Implementation Method 3
the SAP exhibits a Surge Index value greater than 3.2 and/or a Capacity Index value greater than 2900
Data Source
AI summary
Disclosed herein are embodiments of a superabsorbent polymer (SAP) that exhibit superior properties as compared to current commercial SAPs. The disclosed SAPs are useful in a variety of sanitary products and can be made using cost effective methods.