Water-absorbing resin stirrer reduces fine powder
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Solution Overview
Problem
Conventional methods for manufacturing water-absorbing resin result in a high amount of fine powder generation during surface crosslinking, leading to mechanical damage and deterioration of physical properties, which complicates large-scale production and increases costs due to the need for multiple heat treatment devices and inefficient processing.
Innovation Solution
A method involving a stirrer with a specific configuration, including a rotation axis with stirring boards of uniform thickness and scraping blades, allows for optimized stirring and temperature conditions, reducing pressure and friction, and thus minimizing fine powder generation while maintaining high production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surface crosslinking methods are used with traditional stirring equipment, then surface crosslinking can be achieved, but fine powder is generated due to mechanical damage
Solution Approach 1:
The patent changes the geometric parameters of the stirring boards, specifically setting the thickness ratio (maximum thickness/minimum thickness) to 5 or less, and positioning them at intervals of 50-100mm. This parameter optimization reduces mechanical stress on particles during stirring, minimizing fine powder generation while maintaining effective surface crosslinking
Solution Approach 2:
The stirring device is segmented into multiple thin stirring boards arranged at specific intervals along the rotation axis, rather than using a single thick blade. This segmentation distributes the mechanical action more gently across the material, reducing particle damage and fine powder generation
2Reliability
If multiple heat treatment devices are used for surface crosslinking, then crosslinking can be achieved, but device complexity and production costs increase
Solution Approach 1:
The stirring device is designed to perform multiple functions simultaneously: stirring the water-absorbing resin, heating it through the stirring boards, and facilitating surface crosslinking. This multi-functionality eliminates the need for separate heat treatment devices, reducing device complexity while maintaining crosslinking quality
Solution Approach 2:
The patent merges the stirring function and heating function into a single integrated device. The stirring boards serve both to mix the material and to transfer heat for surface crosslinking, combining what would traditionally require separate equipment into one unified system
3Productivity
If traditional stirring equipment is used, then stirring can be performed, but mechanical damage occurs leading to fine powder generation
Solution Approach 1:
The patent optimizes the geometric parameters of the stirring boards, specifically controlling the thickness ratio to 5 or less and setting appropriate intervals between boards. These parameter changes enable effective stirring while minimizing mechanical damage to particles, reducing fine powder generation without sacrificing productivity
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 effectively reduces fine powder generation, enhances the physical properties of water-absorbing resin, and enables efficient large-scale production without compromising performance, thereby improving manufacturing efficiency and reducing costs.
Implementation Method 1
a modifying step that is a step of heating a mixture of a hydrophilic crosslinked polymer containing a carboxyl group and an aqueous solution containing a surface crosslinking agent
Implementation Method 2
reduces pressure and friction, and thus minimizing fine powder generation
Data Source
Figure 1
Figure 2(A)~3(B)
Figure 4
AI summary
A method for surface crosslinking water-absorbing resin of the present invention includes a step (1) of obtaining a wet mixture, a step (2) of obtaining a dried particulate composition, and a step (3) of carrying out a surface crosslinking reaction. With this, since a processing time of each step becomes short, it is possible to mass produce the water-absorbing resin having excellent physical properties. Moreover, a method for manufacturing the water-absorbing resin of the present invention includes a modifying step and a cooling step. The modifying step and/or the cooling step are/is carried out by using stirring means including a rotation axis (70) having a plurality of stirring boards (80b), and the stirring means includes the stirring board (90b) having a specific thickness and/or a scraping blade having a specific shape. With this, it is possible to suppress the generation of the fine powder in the modifying step and/or the cooling step.