Deagglomerating Superabsorbent Polymer Agglomerates via Roll Compression
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Solution Overview
Problem
The production of superabsorbent polymer particles often results in agglomerates during surface postcrosslinking, which are difficult to deagglomerate without compromising product quality, and existing methods either mill or cut the particles, damaging the outer shell and limiting effective deagglomeration.
Innovation Solution
A process involving the use of a roll crusher with specific surface roughness and gap width to deagglomerate the oversize fraction of surface postcrosslinked superabsorbent polymer particles, allowing for moderate mechanical stress that breaks agglomerates without damaging primary particles, and recycling these particles before or into classification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If existing deagglomeration methods (milling or cutting) are used to break agglomerates, then deagglomeration is achieved, but the outer shell is damaged and product quality is compromised
Solution Approach 1:
The invention changes the mechanical parameters of the deagglomeration process by using a roll crusher with specific gap width (0.5-2.0 mm) and roll surface characteristics, transforming the action from intensive milling/cutting to moderate compression that breaks agglomerates while preserving the outer shell
Solution Approach 2:
The invention replaces the traditional milling or cutting mechanical systems with a roll crusher system that uses controlled compression between two rolls, substituting the harmful mechanical action with a gentler compression-based deagglomeration mechanism
2Ease of manufacture
If moderate mechanical stress is applied to deagglomerate particles, then agglomerates are broken without damaging primary particles, but the process requires specific equipment configuration
Solution Approach 1:
The invention establishes specific parameter ranges for the roll crusher (gap width 0.5-2.0 mm, roll surface roughness Rz 0.01-25 μm) that optimize the balance between deagglomeration effectiveness and outer shell preservation, making the process economically viable despite equipment requirements
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
This method effectively deagglomerates agglomerates without impacting product quality, maintaining the high crosslinking density of the outer shell and improving the overall quality of the superabsorbent polymer particles by avoiding attrition and cutting, thus enhancing their properties.
Implementation Method 1
the superabsorbent polymer particles of the oversize fraction are deagglomerated using a roll crusher... Preferably, the teeth of the double toothed roll crusher have rounded edges so that the roll crusher deagglomerates the agglomerates mainly by compression
Data Source
AI summary
The invention relates to a process for producing superabsorbent polymer particles, comprising surface postcrosslinking, classifying the surface postcrosslinked superabsorbent polymer particles, deagglomerating the separated oversize fraction using a roll crusher and recycling the disintegrated oversize fraction before or into the classification of the surface postcrosslinked superabsorbent polymer particles.