Water Absorbent Material with Granular Core and Coating
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Solution Overview
Problem
Water-absorbent polymers in existing water absorption treatment materials become sticky and swell upon absorbing liquids, leading to reduced water disintegrability when flushed through toilets, as the swollen polymer blocks water from reaching the granular core portion.
Innovation Solution
A water absorption treatment material with a granular core portion containing a first water-absorbent polymer and a coating layer portion with a second water-absorbent polymer of smaller mean particle size, which suppresses swelling and allows easy passage of flushing water, while the larger particle size of the first polymer promotes core collapse, enhancing disintegrability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If water-absorbent polymer is included in the coating layer portion to improve clumping ability, then clumping ability is improved, but water disintegrability deteriorates due to swelling blocking water from reaching the granular core portion
Solution Approach 1:
The patent applies local quality by differentiating the particle sizes of water-absorbent polymers in different regions: the coating layer portion uses fine particles (smaller than 10 μm) to minimize swelling and maintain water permeability, while the granular core portion uses coarse particles (10 μm or larger) to provide structural integrity and clumping ability. This spatial differentiation resolves the contradiction between clumping ability and water disintegrability.
Solution Approach 2:
The patent changes the particle size parameter of water-absorbent polymers based on their location within the material. By controlling particle size distribution differently in the coating layer versus the granular core, the patent optimizes both clumping performance and water disintegrability, eliminating the trade-off present in conventional uniform particle size designs.
2Quantity of substance
If water-absorbent polymer in the coating layer portion swells upon absorbing liquid, then clumping ability is improved, but water passage is blocked reducing water disintegrability
Solution Approach 1:
The patent implements local quality by assigning different particle size characteristics to different regions: the coating layer portion contains fine water-absorbent polymer particles that absorb minimal water and swell minimally, maintaining water passage capability, while the granular core portion contains coarse particles that provide the necessary water absorption capacity for clumping without blocking water flow.
Solution Approach 2:
The patent optimizes the particle size parameter of water-absorbent polymers in the coating layer portion (smaller than 10 μm) to reduce swelling volume upon water absorption, thereby maintaining water permeability while still providing sufficient water absorption capacity for effective clumping when combined with the granular core portion.
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 material achieves high water disintegrability and improved clumping ability without the trade-off of reduced clumping, as the smaller particle size polymer in the coating layer prevents blocking of flushing water and the larger particle size polymer ensures effective core collapse.
Implementation Method 1
water-absorbent polymers, when finely pulverized, are less likely to swell upon absorbing a liquid
Implementation Method 2
water-absorbent polymers also have the property of swelling upon absorbing a liquid
Implementation Method 3
by making the particle size of the first water-absorbent polymer larger, collapse of the granular core portion caused by swelling of the water-absorbent polymer is promoted
Data Source
AI summary
The present invention provides a water absorption treatment material that has a structure suitable for obtaining a high level of water disintegrability. A water absorption treatment material is a water absorption treatment material that absorbs a liquid, and includes a granular core portion and a coating layer portion. The granular core portion has a granular shape. The granular core portion contains a first water-absorbent polymer. The coating layer portion covers the granular core portion. The coating layer portion contains a second water-absorbent polymer. The second water-absorbent polymer has a mean particle size smaller than the mean particle size of the first water-absorbent polymer.