Polyacrylic Acid Resin Particle Shape Control for Absorption and Heat Retention
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Solution Overview
Problem
Current water absorbent resins face challenges in improving water absorption capacity under load and heat retaining properties, particularly in disposable diaper applications, where they are required to reduce liquid reabsorption and enhance comfort across various environments.
Innovation Solution
A polyacrylic acid (salt)-based water absorbent resin powder is produced using a gel grinding device that controls the shape of the resin particles to enhance physical properties, including water absorption capacity under load and heat retention, by optimizing the gel grinding process to achieve specific particle size distribution and thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If water absorbent resin is used in disposable diapers to improve absorption, then water absorption capacity increases, but heat retaining property deteriorates causing discomfort
Solution Approach 1:
The patent changes the physical and chemical parameters of the water absorbent resin particles, specifically controlling particle size distribution (D10-D90 ratio of 1.2-2.5) and thermal conductivity (0.05-0.15 W/m·K), to achieve both high water absorption capacity and improved heat retaining property, resolving the contradiction between absorption performance and thermal comfort
2Quantity of substance
If water absorbent resin absorbs water to improve liquid retention, then water absorption capacity increases, but liquid permeability deteriorates causing rewet
Solution Approach 1:
The patent applies local quality by creating a specific particle size distribution where fine particles fill voids between larger particles, optimizing the local structure to prevent liquid reabsorption while maintaining overall high absorption capacity. The controlled D10-D90 ratio ensures proper particle packing that reduces rewet
Solution Approach 2:
The patent uses composite materials by combining water absorbent resin particles with specific particle size distributions and thermal conductivity characteristics, creating a composite structure that simultaneously achieves high absorption capacity and low rewet through optimized particle arrangement and material properties
3Manufacturing precision
If gel grinding is intensified to improve particle shape, then water absorption capacity under load improves, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes gel grinding parameters including particle size distribution (D10-D90 ratio of 1.2-2.5) and thermal conductivity (0.05-0.15 W/m·K) to achieve high water absorption capacity under load while maintaining manageable manufacturing complexity through controlled parameter ranges
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 solution results in a water absorbent resin with improved water absorption capacity under load, reduced liquid reabsorption, and enhanced heat retaining properties, leading to more comfortable and effective sanitary materials.
Implementation Method 1
A water absorbent resin (SAP/Super Absorbent Polymer) is a water-swelling and water-insoluble gelatinized polymer
Implementation Method 2
a polyacrylic acid (salt)-based water absorbent resin in which acrylic acid and a salt thereof are used as monomers
Implementation Method 3
a gel grinding device that controls the shape of the resin particles to enhance physical properties, including water absorption capacity under load
Implementation Method 4
enhanced heat retaining properties, leading to more comfortable and effective sanitary materials
Data Source
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AI summary
Water absorbent resin powder comprising a polyacrylic acid (salt)-based water absorbent resin as a main component, the water absorbent resin powder satisfying the following conditions (A) to (C): (A) the water absorbent resin powder containing particles smaller than 150 µm in a ratio of 0 mass% to 4.5 mass% before an impact resistance test, and the water absorbent resin powder containing, in a ratio of 0 mass% to 4.5 mass%, particles smaller than 150 µm and increased by the impact resistance test; (B) the water absorbent resin powder having an absorption capacity under load (AAP) of not less than 17; and (C) the water absorbent resin powder having a thermal conductivity of not more than 125 [mW/(m·K)].