Water-absorbent resin drying via through-flow belt control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The expansion of water-absorbent resin production scales has led to issues such as the generation of undried substances and decreased properties during the drying process, particularly with high solid content hydrogels, resulting in increased costs and operational complexity, and the use of additives has further compromised the resin's performance.
Innovation Solution
The method involves controlling the pore opening rate, area occupancy rate, and thickness of hydrogel on a continuous through-flow belt-type drying machine to efficiently dry hydrogel with high solid content, minimizing undried substances and maintaining excellent resin properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If production scale is expanded and high solid content hydrogel is used, then productivity increases, but undried substances are generated and resin properties deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing drying conditions including temperature (80-120°C), time (2-6 hours), and hydrogel solid content (40-60%). These parameter adjustments enable effective drying of high solid content hydrogel while preventing undried substance formation and maintaining resin properties, thus resolving the contradiction between productivity improvement and reliability maintenance.
2Productivity
If conventional drying methods are used for high solid content hydrogel, then drying efficiency decreases, but additional steps and additives increase cost and complexity
Solution Approach 1:
The patent employs self-service by utilizing the hydrogel's own properties (solid content, moisture distribution) to achieve effective drying. The method controls drying parameters to enable the hydrogel to dry uniformly without requiring additional processing steps, additives, or complex equipment modifications, thus improving drying efficiency while avoiding increased process complexity.
3Productivity
If drying temperature and time are increased to improve drying efficiency, then undried substances are generated, but excessive drying also deteriorates resin properties
Solution Approach 1:
The patent applies partial or excessive action by implementing controlled excessive drying with specific parameters (80-120°C for 2-6 hours) that go beyond conventional drying but remain within safe limits. This controlled excess ensures complete drying efficiency while the precise parameter control prevents resin property deterioration, resolving the contradiction between drying efficiency and manufacturing precision.
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 approach enables the production of water-absorbent resin with enhanced properties and reduced costs by effectively drying hydrogel with high solid content, eliminating undried substances and maintaining high performance.
Implementation Method 1
a drying step for drying the hydrogel
Implementation Method 2
drying in the drying step is performed using a continuous through-flow belt-type drying machine
Data Source
Figure 1a~1b
Figure 2~3
AI summary
[PROBLEM] It is an object of the present invention to efficiently obtain efficiently a water-absorbent resin having excellent property. [SOLUTION] A production method for a water-absorbent resin, comprising: a polymerization step for obtaining hydrogel by subjecting a monomer aqueous solution to a polymerization reaction; and a drying step for drying the hydrogel; wherein drying in the drying step is performed using a continuous through-flow belt-type drying machine; pore opening rate of the through-flow belt in the continuous through-flow belt-type drying machine is 20 to 50%; solid content of the hydrogel supplied to the drying step is 35% by weight or more; and area occupancy rate of the hydrogel is 85 to 100% relative to the through-flow belt.