Superabsorbent Polymer Surface Crosslinking for Permeability Stability
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Solution Overview
Problem
Commercial particulate superabsorbent polymer compositions experience a significant reduction in properties such as gel bed permeability during manufacturing and converting processes, leading to premature leakage and skin wetness issues in absorbent articles.
Innovation Solution
A particulate superabsorbent polymer composition is developed with specific formulations including a foaming agent, lipophile and polyethoxylated hydrophilic surfactants, and a neutralized aluminum salt, which enhances stability and permeability, maintaining high centrifuge retention capacity and absorbency under load while resisting processing-induced losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If commercial particulate superabsorbent polymer compositions undergo significant processing during manufacturing and converting processes, then production efficiency is improved, but gel bed permeability and other properties are significantly reduced
Solution Approach 1:
The patent applies surface crosslinking treatment to the superabsorbent polymer particles before they undergo manufacturing and converting processes. This preliminary action creates a protective crosslinked layer on the particle surfaces that prevents degradation of gel bed permeability and other critical properties during subsequent processing, while still allowing the particles to be processed efficiently for final product formation
Solution Approach 2:
The patent modifies the chemical and physical parameters of the superabsorbent polymer composition by introducing surface crosslinking agents and controlling the crosslinking degree. This parameter change creates a more stable structure that resists processing-induced degradation, maintaining gel bed permeability and other properties throughout the manufacturing and converting processes
2Stability of the object's composition
If surface crosslinking is applied to particulate superabsorbent polymer to improve stability, then property retention during processing is improved, but absorption speed and permeability may be compromised
Solution Approach 1:
The patent applies surface crosslinking selectively to the outer surfaces of the superabsorbent polymer particles rather than throughout the entire particle structure. This local quality approach creates a protective crosslinked layer on the surfaces that prevents processing degradation, while the inner core of the particles remains uncrosslinked and maintains its rapid absorption capabilities
Solution Approach 2:
The patent applies partial surface crosslinking rather than complete crosslinking. By controlling the crosslinking degree to affect only the surface region, the patent achieves sufficient stability during processing while preserving the absorption speed and permeability that would be compromised by full crosslinking of the entire particle structure
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 achieves improved stability and permeability, maintaining original properties post-processing, reducing leakage and skin wetness, and increasing centrifuge retention capacity, thus enhancing the performance of absorbent articles.
Implementation Method 1
a neutralized aluminum salt applied to the surface of the particulate superabsorbent polymer, in the form of an aqueous neutralized aluminum salt solution having a pH value from about 5.5 to about 8
Implementation Method 2
from about 0.05 to about 2.0 wt. % based on the total amount of the polymerizable unsaturated acid group containing monomer solution of a foaming agent
Implementation Method 3
from about 0.001 to about 1.0 wt. % based on the total amount of the polymerizable unsaturated acid group containing monomer solution of a mixture of a lipophile surfactant and a polyethoxylated hydrophilic surfactant
Implementation Method 4
a superabsorbent polymer, in general refers to a water-swellable, water-insoluble polymer, or material, capable of absorbing at least about 10 times its weight
Implementation Method 5
designed to quickly distribute fluids in high concentrations, which requires high permeability
Implementation Method 6
the formation of superabsorbent hydrogel from the polymerization
Implementation Method 7
a crosslinked partially neutralized acrylate polymer
Data Source
AI summary
The present invention relates to a fast particulate superabsorbent polymer composition comprising a polymer comprising a neutralized aluminum salt solution applied to the surface of a particulate superabsorbent polymer; wherein an aqueous solution of the neutralized aluminum salt has a pH value from about 5.5 to about 8; and subsequent to subjecting the particulate superabsorbent polymer composition to the Processing Test, the particulate superabsorbent polymer composition has a permeability stability index of from about 0.60 to about 0.99, and a compressibility from 1.30 mm2/N to about 4 mm2/N as measured by the Compression Test, and wherein the particulate superabsorbent polymer composition may have a Vortex time of from 25 to 60 seconds and absorbency under load at 0.9 psi of from 15 to 21 g/g.