Surface-Crosslinked Superabsorbent Resin Permeability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Superabsorbent polymers (SAPs) face issues with increased stickiness and irreversible agglomeration when absorbing water, leading to poor processability and degradation of physical properties, particularly permeability, during manufacturing, which conventional methods attempt to address using silica and organic solvents but result in decreased productivity and increased costs.
Innovation Solution
A method for preparing surface-crosslinked superabsorbent polymers using a water-soluble polyvalent cationic salt and a polycarbonic acid-based copolymer, in conjunction with a surface crosslinking agent, without silica or organic solvents, to enhance permeability and control particle sizes, thereby improving processability and minimizing property degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If SAPs absorb water to improve moisture absorption capacity, then absorption performance is improved, but stickiness and agglomeration increase causing poor processability
Solution Approach 1:
The patent applies surface crosslinking treatment specifically to the outer layer of SAP particles, creating a hydrophobic crosslinked skin that prevents water adhesion and particle agglomeration, while the inner core maintains high water absorption capacity. This local differentiation resolves the contradiction between absorption performance and processability.
2Ease of operation
If silica and organic solvents are used to prevent stickiness and improve processability, then ease of operation is improved, but physical properties and permeability degrade
Solution Approach 1:
The patent changes the chemical parameters of the SAP surface by introducing crosslinked structures through surface crosslinking treatment. This modifies the surface properties to be hydrophobic and structurally stable, preventing stickiness without requiring silica or organic solvents, thus maintaining physical properties and permeability while improving processability.
3Reliability
If conventional surface crosslinking methods are used to improve permeability, then physical properties are improved, but production cost and process time increase
Solution Approach 1:
The patent employs inexpensive crosslinking agents such as sodium carbonate or potassium carbonate instead of costly conventional agents. The surface crosslinking treatment is applied as a brief post-processing step that quickly forms a protective layer, reducing both material costs and process time while achieving the desired permeability improvement.
4Productivity
If SAP particles are processed during manufacturing, then production efficiency is improved, but particle sizes become uncontrolled and physical properties degrade
Solution Approach 1:
The patent applies surface crosslinking treatment as a preliminary protective measure before subsequent processing steps. This pre-formed crosslinked surface acts as a protective shell that prevents particle breakdown and size variation during handling and processing, enabling efficient manufacturing while maintaining precise particle size control.
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 method significantly improves permeability and processability of SAPs, reducing production time and costs while maintaining high physical properties, even after processing, by using a combination of aluminum or zirconium sulfate, polycarbonic acid-based copolymer, and ethylene carbonate, without the need for silica or organic solvents.
Implementation Method 1
surface crosslinking modification with a mixture solution comprising a polycarbonic acid-based copolymer and a surface crosslinking agent
Implementation Method 2
the surface of SAP particles with a water-soluble polyvalent cationic salt and a polycarbonic acid-based copolymer, followed by treatment with a surface crosslinking agent
Implementation Method 3
pre-treating the superabsorbent base resin by mixing aluminum sulfate or zirconium sulfate
Data Source
Figure 1A~1B
Figure 1C
Figure 2A~2B
AI summary
Disclosed herein is a superabsorbent polymer with a surface crosslinked with a water-soluble polyvalent cationic salt, a polycarbonic acid-based copolymer, and a surface crosslinking agent wherein an improvement is brought about in physical properties, with the concomitant reduction of process time and cost. Also, a method is provided for preparing the surface-crosslinked superabsorbent polymer.