Superabsorbent Polymer Particles with Clay Platelets for Gel Blocking
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Solution Overview
Problem
Existing superabsorbent polymer particles in absorbent articles face challenges with gel blocking due to poor permeability, which is often addressed by surface cross-linking, but this increases stiffness and reduces swelling capacity, particularly affecting smaller particles.
Innovation Solution
The development of superabsorbent polymer particles with clay platelets that have edge and surface modifications, combined with areas substantially free of clay platelets, to enhance permeability and absorption capacity while maintaining swelling ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surface cross-linking is applied to increase permeability, then permeability is improved, but swelling capacity is reduced
Solution Approach 1:
The patent applies local quality by creating particles with heterogeneous clay distribution - some regions have clay platelets for structural integrity and permeability, while other regions are clay-free to maximize swelling capacity. This spatial differentiation allows different parts of the same particle to fulfill different functions, resolving the contradiction between permeability and swelling capacity.
Solution Approach 2:
The patent uses composite materials by combining superabsorbent polymer with clay platelets in a non-uniform distribution. The composite structure integrates the permeability-enhancing properties of clay with the swelling capabilities of the polymer, creating a multi-functional material that achieves both high permeability and high swelling capacity simultaneously.
2Strength
If surface cross-linking is applied to increase stiffness, then resistance to deformation is improved, but swelling capacity is reduced
Solution Approach 1:
The patent applies local quality by creating particles with heterogeneous clay distribution - some regions have clay platelets for structural integrity and permeability, while other regions are clay-free to maximize swelling capacity. This spatial differentiation allows different parts of the same particle to fulfill different functions, resolving the contradiction between permeability and swelling capacity.
Solution Approach 2:
The patent uses composite materials by combining superabsorbent polymer with clay platelets in a non-uniform distribution. The composite structure integrates the permeability-enhancing properties of clay with the swelling capabilities of the polymer, creating a multi-functional material that achieves both high permeability and high swelling capacity simultaneously.
3Speed
If smaller particle sizes are used to improve absorption speed, then absorption speed is improved, but permeability is reduced due to increased gel blocking
Solution Approach 1:
The patent applies local quality by creating particles with heterogeneous clay distribution - some regions have clay platelets for structural integrity and permeability, while other regions are clay-free to maximize swelling capacity. This spatial differentiation allows different parts of the same particle to fulfill different functions, resolving the contradiction between permeability and swelling capacity.
Solution Approach 2:
The patent uses composite materials by combining superabsorbent polymer with clay platelets in a non-uniform distribution. The composite structure integrates the permeability-enhancing properties of clay with the swelling capabilities of the polymer, creating a multi-functional material that achieves both high permeability and high swelling capacity simultaneously.
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 modified superabsorbent polymer particles exhibit improved permeability, absorption speed, and swelling capacity, reducing gel blocking and maintaining performance across various particle sizes, including smaller ones, while being cost-efficient.
Implementation Method 1
The modified superabsorbent polymer particles exhibit improved permeability
Implementation Method 2
The superabsorbent polymer particles need first to be able to absorb the liquid exudates fast. The absorption speed of superabsorbent polymer particles has generally been characterized in the prior art by measuring the Free Swell Rate (FSR) of the particles.
Implementation Method 3
the increase in permeability typically comes at the price of reduced capacity. Given the particles have a stiffer surface, they cannot swell as unhindered as non surface-cross-linked particles.
Data Source
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AI summary
Superabsorbent polymer particles are provided and comprise clay platelets with edge modification and/or surface modification. The superabsorbent polymer particles comprise one, or more than one area(s) with clay platelets and one, or more than one area(s) substantially free of clay platelets. The total volume of the area(s) substantially free of clay platelets is higher than the total volume of the area(s) with clay platelets.