Water-Absorbent Resin Particles With Controlled Gel Brightness
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Solution Overview
Problem
Existing water-absorbent resin particles do not achieve optimal absorption performance in absorbers, necessitating improvements in absorption capacity.
Innovation Solution
Water-absorbent resin particles with a gel brightness L* of 8 to 60, measured using a specific method, are developed to enhance absorption capacity, with preferred physiological saline retention amounts of 30 to 60 g/g and 5-minute non-pressurization DW values of 30 ml/g or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional water-absorbent resin particles are used in absorbers, then basic absorption function is provided, but absorption amount and swelling capacity are insufficient
Solution Approach 1:
The patent applies parameter changes by controlling the gel brightness L* within a specific range (5 ≤ L* < 35) to optimize the absorption performance. This parameter control affects the gel structure and swelling characteristics, thereby improving both absorption amount and reliability without requiring fundamental changes to the resin composition or manufacturing process
2Measurement precision
If gel brightness L* is measured without specific measurement conditions, then measurement is simple, but measurement precision and reproducibility are poor
Solution Approach 1:
The patent applies preliminary action by pre-establishing specific measurement conditions (using 400 nm blue light, specific cell dimensions, and standardized procedures) before actual measurement. This preliminary setup ensures that subsequent measurements are precise and reproducible without requiring complex real-time adjustments or sophisticated equipment during the measurement process itself
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 specified water-absorbent resin particles provide absorbers with improved absorption amounts and uniform swelling characteristics, leading to enhanced performance in absorbent articles like diapers.
Implementation Method 1
adding 5.0 g of ion-exchanged water to the round cell to cause the water-absorbent resin particles to absorb water
Implementation Method 2
water-absorbent resin particles having a gel brightness L* of 8 to 60 measured by a method including the following steps (A), (B), and (C) in this order, (B) adding 5.0 g of ion-exchanged water to the round cell to cause the water-absorbent resin particles to absorb water
Data Source
AI summary
Water-absorbent resin particles having a gel brightness L* of 8 to 60 measured by a method including the following steps (A), (B), and (C) in this order are disclosed. (A) 0.1 g of water-absorbent resin particles are uniformly scattered in a colorless and transparent round cell for a color-difference meter having an inner diameter of 30 mm. (B) 5.0 g of ion-exchanged water is added to the round cell to cause the water-absorbent resin particles to absorb water. (C) a brightness L* of an obtained gel is measured on a black background after five minutes from the addition of the ion-exchanged water.