Super Absorbent Polymer Manufacturing for Absorption–Permeability Balance
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Solution Overview
Problem
Existing super absorbent polymers used in hygienic materials face challenges in achieving high absorption performance, liquid permeability, and efficient liquid distribution, particularly in pulpless diapers where super absorbent polymers are present in multiple layers.
Innovation Solution
A method involving crosslinking a water-soluble ethylenically unsaturated monomer with an internal crosslinking agent, foaming agent, and surfactant to form a hydrogel polymer, followed by coarsely pulverizing to a specific particle diameter, drying, and surface-crosslinking to enhance absorption performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If super absorbent polymer particles are placed in multiple layers to reduce pulp content, then the thickness of hygienic materials is reduced, but liquid permeability and liquid distribution efficiency deteriorate
Solution Approach 1:
The super absorbent polymer particles are segmented into different particle size ranges (first particles: 0.1-0.5mm, second particles: 0.5-1.0mm) and distributed in specific layers. This segmentation allows smaller particles to provide high absorption capacity while larger particles maintain liquid permeability and distribution, resolving the contradiction between reduced thickness and maintained liquid distribution efficiency
Solution Approach 2:
Different particle size distributions are applied to different layers of the super absorbent polymer composition. The first particles are concentrated in layers requiring high absorption, while the second particles are distributed in layers requiring high permeability. This local quality differentiation optimizes both thickness reduction and liquid distribution performance in specific regions
2Quantity of substance
If super absorbent polymer content is increased to improve absorption capacity, then absorption performance is improved, but liquid permeability deteriorates
Solution Approach 1:
The super absorbent polymer is segmented into two particle size ranges with different functional properties. Smaller particles (0.1-0.5mm) provide high absorption capacity due to larger surface area to volume ratio, while larger particles (0.5-1.0mm) maintain liquid permeability. This segmentation allows both absorption capacity and permeability to be optimized simultaneously
Solution Approach 2:
The invention creates a composite structure within the super absorbent polymer composition by combining particles of different sizes and properties. This composite approach allows the material to exhibit both high absorption capacity (from smaller particles) and high liquid permeability (from larger particles), resolving the contradiction between these two properties
3Quantity of substance
If surface crosslinking is performed to improve absorption performance, then absorption capacity is improved, but particle strength may deteriorate
Solution Approach 1:
The surface crosslinking process parameters are precisely controlled (crosslinking agent concentration, temperature, time) to achieve optimal balance between absorption capacity enhancement and particle strength maintenance. By adjusting these parameters, the surface crosslinking improves absorption performance while preventing excessive hardening that would reduce particle strength and liquid permeability
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 results in super absorbent polymers with improved absorption capacity, rapid liquid transfer, and enhanced liquid permeability, suitable for use in hygienic materials like diapers.
Implementation Method 1
crosslinking a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups in the presence of an internal crosslinking agent, a foaming agent and the surfactant to form a hydrogel polymer
Implementation Method 2
crosslinking a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups in the presence of an internal crosslinking agent, a foaming agent and the surfactant to form a hydrogel polymer containing a first crosslinked polymer
Implementation Method 3
crosslinking a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups in the presence of an internal crosslinking agent
Implementation Method 4
super absorbent polymer is a synthetic polymer material capable of absorbing moisture from about 500 to about 1,000 times its own weight
Data Source
AI summary
A super absorbent polymer according to the present invention has an excellent discoloration resistance property even under high temperature/high humidity conditions, while maintaining excellent absorption performance, and is preferably used for hygienic materials such as diapers, and thus can exhibit excellent performance.