Self-Cross-Linked Biodegradable SAP for Balanced Absorption
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Solution Overview
Problem
Existing biodegradable hydrogel polymers used as Super Absorbent Polymers (SAPs) face challenges in achieving balanced absorption properties, particularly in centrifuge retention capacity (CRC), absorption capacity under pressure (AUP), and vortex absorption time, while maintaining biodegradability.
Innovation Solution
A biodegradable polymer material composed of a self-cross-linked polysaccharide component, such as carboxylmethyl cellulose (CMC) or polysaccharides with introduced carboxyl groups, is developed through a self-cross-linking process using esterification reactions, optimizing absorption characteristics and biodegradability without relying on external cross-linking agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cross-linking agent is introduced on the surface of the absorbent material to improve AUP characteristics, then absorption capacity under pressure is improved, but absorption time is reduced leading to poor vortex test evaluation results
Solution Approach 1:
The polysaccharide component performs self-cross-linking through esterification reactions between carboxyl groups and hydroxyl groups within the polymer structure itself, eliminating the need for external cross-linking agents. This self-service mechanism achieves the desired gel strength and AUP characteristics without the harmful side effect of reduced absorption time, as the cross-linking occurs naturally during the polymerization process rather than being added subsequently as a surface treatment.
Solution Approach 2:
The invention changes the chemical parameters of the polymer by introducing carboxyl groups into the polysaccharide structure through carboxymethylation or carboxyalkylation. This parameter change enables the polysaccharide to undergo esterification reactions that create cross-linked structures with appropriate gel strength, improving AUP characteristics while maintaining fast absorption kinetics through controlled cross-linking density.
2Strength
If gel strength is strengthened by introducing a cross-linking agent, then absorption capacity under pressure is improved, but vortex test evaluation results deteriorate
Solution Approach 1:
The polymer achieves self-cross-linking through esterification reactions between carboxyl groups and hydroxyl groups within the polysaccharide structure, eliminating the need for external cross-linking agents. This self-service mechanism creates an integrated cross-linked network that provides adequate gel strength while preserving rapid absorption kinetics, as the cross-linking occurs uniformly throughout the polymer matrix rather than being concentrated on the surface.
3Object-affected harmful factors
If biodegradable materials are used to replace vinyl-based SAPs, then environmental compatibility is improved, but balanced absorption properties (CRC, AUP, vortex test) are not achieved
Solution Approach 1:
The invention creates a composite structure within the polysaccharide polymer by combining carboxymethylated or carboxyalkylated polysaccharide chains with ester cross-links formed through self-cross-linking. This composite material approach integrates the biodegradability of natural polysaccharides with the absorption performance of cross-linked hydrogels, achieving balanced CRC, AUP, and vortex test characteristics while maintaining environmental compatibility.
Solution Approach 2:
The invention changes the chemical parameters of biodegradable polysaccharides by introducing carboxyl groups and enabling esterification cross-linking. These parameter changes transform the physical and chemical properties of the biodegradable material, creating a network structure with appropriate gel strength and porosity that delivers balanced absorption characteristics across all three evaluation methods while preserving biodegradability.
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 material exhibits rapid absorption, balanced CRC and AUP, and high biodegradability, with absorption times ranging from 0 to 150 seconds and biodegradability exceeding 50% to 100%, addressing the limitations of existing SAPs.
Implementation Method 1
A biodegradable polymer material composed of a self-cross-linked polysaccharide component, such as carboxylmethyl cellulose (CMC) or polysaccharides with introduced carboxyl groups, is developed through a self-cross-linking process using esterification reactions
Data Source
AI summary
The present application can provide a polymer material, a preparation method therefor, and a use thereof. The present application can provide a polymer material made of a material with biodegradability and exhibiting balanced absorption properties. The present application can also provide a preparation method for such a polymer material, and a use thereof.