Superabsorbent Polymer with Coarse Silica for Permeability
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Solution Overview
Problem
Superabsorbent polymers face challenges in maintaining high absorbency under pressure and liquid permeability while achieving excellent anti-caking properties, especially under conditions of high temperature and humidity, due to the adverse effects of adding silica or clay, which often result in reduced performance and separation during transport.
Innovation Solution
A superabsorbent polymer composition that includes a crosslinked polymer with surface-treated aluminum hydroxide and a minimal amount of silica, where the aluminum hydroxide is attached to the surface of the polymer, enhancing anti-caking and permeability without compromising water retention capacity or absorbency under pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If silica or clay is added to improve permeability, then liquid permeability is improved, but water retention capacity and absorbency under pressure are reduced
Solution Approach 1:
The invention changes the particle size parameter of silica from conventional fine particles to coarse particles with specific size range (3-10 μm average diameter). This parameter change allows silica to provide permeability improvement while minimizing its negative impact on water retention and absorbency under pressure, as the larger particles create larger inter-particle spaces that facilitate liquid flow without excessively reducing the gel's water-holding capacity.
Solution Approach 2:
The invention creates a composite material system combining superabsorbent polymer particles with coarse silica particles in a specific weight ratio (silica: 0.1-5 parts by weight per 100 parts by weight of polymer). This composite structure leverages the permeability-enhancing effect of silica while the controlled dosage and particle size prevent excessive reduction in absorbency performance, achieving a balance between permeability and water retention.
2Stability of the object's composition
If silica is added by dry process to ensure anti-caking effect, then anti-caking property is improved, but absorbency under pressure is excessively reduced
Solution Approach 1:
The invention changes the particle size parameter of silica to coarse particles (3-10 μm average diameter) and controls the dosage within a specific range (0.1-5 parts by weight per 100 parts by weight of polymer). This parameter optimization allows the silica to provide sufficient anti-caking effect through dry mixing while minimizing the reduction in absorbency under pressure, as the larger particles create less disruption to the polymer gel structure compared to fine particles.
Solution Approach 2:
The invention applies a controlled amount of silica (0.1-5 parts by weight per 100 parts by weight of polymer) which is sufficient to provide anti-caking protection and permeability improvement but limited enough to prevent excessive reduction in absorbency under pressure. This partial action approach balances the competing requirements of anti-caking stability and absorbency performance.
3Stability of the object's composition
If silica is mixed by wet process to improve anti-caking, then anti-caking property is improved, but absorbency under pressure is remarkably reduced
Solution Approach 1:
The invention changes the particle size parameter to coarse silica (3-10 μm average diameter) and controls dosage within specific ranges, which minimizes the negative impact on absorbency under pressure while still providing anti-caking benefits. The larger particle size reduces the surface area contact with the polymer gel, thereby preserving more absorbency capacity compared to fine particles used in wet mixing processes.
4Reliability
If small amount of silica is added to maintain absorbency, then absorbency under pressure is preserved, but anti-caking effect is insufficient and silica separates during transport
Solution Approach 1:
The invention changes the particle size to coarse silica (3-10 μm average diameter) which provides better anti-caking effect and transport stability compared to fine particles. The larger particles are less prone to separation during transport and provide sufficient anti-caking protection even at lower dosages (0.1-5 parts by weight per 100 parts by weight of polymer), while maintaining absorbency under pressure.
Solution Approach 2:
The invention creates a stable composite material system combining superabsorbent polymer with coarse silica particles in an optimized weight ratio. The specific particle size and dosage range ensure that the silica particles remain distributed and attached to the polymer particles during transport, preventing separation while providing adequate anti-caking effect and preserving absorbency performance.
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 centrifuge retention capacity, absorbency under pressure, and liquid permeability, maintaining stability and performance even under high temperature and humidity conditions, with reduced risk of separation and improved storage stability.
Implementation Method 1
the aluminum hydroxide is attached on the surface of the superabsorbent polymer
Implementation Method 2
A superabsorbent polymer (SAP) is a type of synthetic polymeric material capable of absorbing from 500 to 1000 times its own weight of moisture
Implementation Method 3
a process of reverse phase suspension polymerization and a process of solution polymerization have been known
Data Source
Figure 1~2
AI summary
A superabsorbent polymer which has excellent initial absorbency and keeps water from flowing out under pressure even after the passage of a long period of time, in which the superabsorbent polymer keeps water from flowing out under pressure even after the passage of a long period of time to exhibit excellent absorbency, and also has an anti-caking property under conditions of high temperature and high humidity to improve storage stability, is provided. The superabsorbent polymer composition of the present invention may be used to improve physical properties of a variety of diapers, potty training pants, incontinence pads, etc., thereby being applied to production of personal absorbent hygiene products having high absorbency and excellent storage stability under conditions of high temperature and high humidity.