Particulate Water Absorbent Agent Surface Crosslinking
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Solution Overview
Problem
Conventional methods for manufacturing particulate water absorbent agents often fail to achieve a high water absorption ratio and rate while maintaining moisture absorption fluidity under high humidity conditions and absorption against pressure.
Innovation Solution
Increasing grinding energy during the gel grinding process and incorporating moisture absorption fluidity improving agents such as multi-component metal compounds with a hydrotalcite structure and water insoluble metal phosphate to enhance the physical properties of the particulate water absorbent agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional manufacturing methods are used for particulate water absorbent agents, then production is simpler and cost-effective, but the water absorption ratio and rate cannot be simultaneously optimized while maintaining moisture absorption fluidity under high humidity
Solution Approach 1:
The patent applies preliminary action by performing surface crosslinking treatment on the water absorbent resin particles before final product formation. This pre-treatment modifies the surface properties to control moisture absorption characteristics, enabling the particles to maintain fluidity under high humidity while achieving high water absorption ratio and rate. The surface crosslinking is performed as a preliminary step that sets the foundation for subsequent performance optimization.
Solution Approach 2:
The patent utilizes parameter changes by carefully controlling the surface crosslinking degree and particle size distribution to achieve optimal performance. By adjusting the crosslinking parameters (such as crosslinking agent concentration, treatment time, and temperature) and particle size parameters, the invention optimizes the balance between water absorption capability and moisture fluidity, resolving the contradiction between high absorption performance and manufacturing simplicity.
2Reliability
If surface crosslinking is performed to improve water absorption ratio, then absorption performance increases, but moisture absorption fluidity under high humidity conditions deteriorates
Solution Approach 1:
The patent applies local quality by performing surface crosslinking only on the outer layer of the water absorbent resin particles rather than throughout the entire particle structure. This creates a differentiated structure where the surface has crosslinked properties for controlled moisture interaction, while the internal structure remains highly absorbent. The surface crosslinking layer acts as a selective barrier that maintains fluidity while enabling high water absorption ratio.
Solution Approach 2:
The patent applies partial action by using controlled surface crosslinking with specific crosslinking agents and conditions to achieve just enough surface modification to improve water absorption ratio without excessive crosslinking that would harm moisture fluidity. The crosslinking is performed to a specific degree (partial action) rather than complete crosslinking, optimizing the balance between absorption performance and fluidity under high humidity.
3Speed
If grinding energy is increased to improve water absorption rate, then absorption rate increases, but particle size distribution and physical properties may be compromised
Solution Approach 1:
The patent applies preliminary action by performing surface crosslinking treatment before the grinding process. This pre-treatment strengthens the particle structure and surface properties, enabling the particles to withstand higher grinding energies without excessive fragmentation or loss of physical properties. The preliminary crosslinking creates a robust structure that maintains particle integrity during high-energy grinding, allowing optimization of water absorption rate while controlling particle size distribution.
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 approach results in particulate water absorbent agents with improved water absorption ratio, rate, and moisture absorption fluidity, effectively addressing the limitations of conventional methods by ensuring better performance under high humidity and pressure conditions.
Implementation Method 1
incorporating moisture absorption fluidity improving agents such as multi-component metal compounds with a hydrotalcite structure and water insoluble metal phosphate
Implementation Method 2
particulate water absorbent agent having both a high water absorption ratio and a high water absorption rate
Data Source
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Figure 4~5
AI summary
The purpose of the present invention is to provide a particulate water absorbing agent having both a high water absorption multiplying factor and a high water absorption rate and a method for manufacturing the same. The present invention is a particulate water absorbing agent for which CRC is 30 to 50 g/g, wherein the weight average particulate diameter (D50) is 200 -600 µm, and the DRC index given by the following formula is a specific value (for example, 43, 30, or 20) or less: DRC index = (49 - DRC5min [g/g])/(D50 [um]/1000).