Water-Absorbing Resin Composition Balancing Gel Stability and UV Separation
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Solution Overview
Problem
Water-absorbing resins used in hygienic materials like diapers and sanitary napkins suffer from gel deterioration, leading to reduced absorbability and potential skin irritation due to eluted water-soluble matter, and existing methods for enhancing gel stability hinder handleability during separation treatments.
Innovation Solution
A water-absorbing resin composition comprising surface-crosslinked water-absorbent resin particles and a chelating agent with specific iron (III) chelate stability constants and carboxyl groups, ensuring both gel stability during use and high handleability after UV irradiation for separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If gel stability of water-absorbing resin is enhanced, then gel stability during use is improved, but gel strength reduction after UV irradiation is hindered
Solution Approach 1:
The invention introduces a chelating agent with specific parameters (iron (III) chelate stability constant of 16-24 log KML and 4-10 carboxyl groups) to modify the gel structure. This parameter change enables the gel to maintain stability during use while allowing controlled degradation after UV irradiation, resolving the contradiction between gel stability and handleability.
Solution Approach 2:
The invention creates a composite system combining water-absorbent resin particles with a specific chelating agent. This composite material exhibits both gel stability during normal use and improved handleability after UV irradiation, as the chelating agent facilitates controlled gel degradation while maintaining structural integrity during operation.
2Ease of operation
If gel strength is reduced to facilitate separation, then handleability is improved, but gel stability during use deteriorates
Solution Approach 1:
The invention makes the gel structure dynamic by incorporating a chelating agent that enables reversible changes in gel strength. The gel maintains high stability during normal use but can be easily degraded by UV irradiation to facilitate separation, achieving both gel stability and handleability through dynamic structural adjustment.
Solution Approach 2:
The chelating agent with specific iron (III) chelate stability constant (16-24 log KML) and carboxyl group count (4-10) creates a gel system that can change its structural parameters in response to UV irradiation. This parameter change enables the gel to transition from a stable state during use to a degraded state for easy separation.
3Reliability
If water-soluble dissolved matter is eluted from gel, then gel deterioration is reduced, but skin irritation increases
Solution Approach 1:
The invention uses a disposable absorbent article containing the water-absorbing resin composition. The gel is designed to maintain stability during the short period of use and then be easily degraded and disposed of, preventing skin irritation from prolonged contact with eluted matter while ensuring gel stability during the brief wear period.
Solution Approach 2:
The chelating agent modifies the gel's chemical parameters to reduce elution of water-soluble dissolved matter during normal use, thereby preventing skin irritation. The specific iron (III) chelate stability constant and carboxyl group count are optimized to minimize harmful elution while maintaining gel functionality.
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 composition maintains gel stability during normal use while facilitating easy separation post-use through UV irradiation, preventing skin irritation and improving handling.
Implementation Method 1
the chelating agent has an iron (III) chelate stability constant of 16 log KML or more and 24 log KML or less
Implementation Method 2
ultraviolet irradiation, and the addition of a gel degradation accelerator, and the like are used
Data Source
AI summary
Provided is a water-absorbing resin composition having both gel stability of the water-absorbing resin composition when a hygienic material is usually worn and high handleability when the water-absorbing resin composition is subjected to a separation treatment after being irradiated with ultraviolet rays as a waste treatment means. The water-absorbing resin composition including water-absorbent resin particles and a chelating agent. The water-absorbent resin particles are surface-crosslinked, and the chelating agent has an iron (III) chelate stability constant of 16 log KML or more and 24 log KML or less, and 4 or more and 10 or less carboxyl groups.