Water-Absorbent Resin Particles for Diffusibility and Re-Wet Control
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Solution Overview
Problem
Water-absorbent resin particles in absorbent materials face a challenge in achieving both excellent liquid diffusibility and a practically sufficient amount of re-wet, as high liquid permeability often leads to increased re-wet.
Innovation Solution
The development of water-absorbent resin particles with a contact angle of 0.9% by mass saline at 25°C of 100 degrees or larger, achieved through adjustments in polymerization processes and surface coating with materials like polyurethane, to enhance liquid repellency and promote initial diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If water-absorbent resin particles with high liquid permeability are used, then liquid diffusibility is excellent, but the amount of re-wet increases
Solution Approach 1:
The patent changes the surface energy parameter of the resin particles by controlling the contact angle to be 100 degrees or more with 0.9% saline at 25°C. This parameter change creates a balance where the surface is sufficiently hydrophobic to prevent re-wet but still allows initial liquid diffusion, resolving the contradiction between liquid diffusibility and re-wet control
Solution Approach 2:
The patent applies different surface properties to different aspects of liquid interaction: the surface is designed to be hydrophobic (high contact angle) to repel liquid and prevent re-wet, while the internal structure maintains high liquid permeability for excellent initial diffusibility. This local differentiation of surface vs. bulk properties resolves the contradiction
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
These resin particles effectively balance liquid diffusibility and re-wet, ensuring efficient liquid distribution while minimizing re-wet, as demonstrated by improved contact angles and absorption rates.
Implementation Method 1
a contact angle of 0.9% by mass saline at 25° C. 2° C. is 100 degrees or larger
Implementation Method 2
a contact angle of 0.9% by mass saline at 25° C. 2° C. is 100 degrees or larger
Implementation Method 3
liquid diffusibility in addition to a high water absorption amount
Implementation Method 4
liquid diffusibility is excellent
Data Source
AI summary
The present disclosure relates to water-absorbent resin particles in which a contact angle of 0.9% by mass saline at 25° C.±2° C. is 100 degrees or larger, and an absorbent material containing the water-absorbent resin particles.