Water Absorbing Agent Dust Reduction via Surface Crosslinking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional water absorbing agents face challenges in simultaneously achieving high absorption performance and reducing dust generation, particularly in the production process of absorbent bodies like disposable diapers, where dust generation affects both production efficiency and product performance.
Innovation Solution
A particulate water absorbing agent composed of a polyacrylic acid (salt)-based water absorbent resin with a high content of polyacrylic acid (salt) as the main component, combined with a hydrophilic polymer compound and a stabilizing agent, is produced using a method that includes surface crosslinking and specific processing steps to enhance absorption characteristics and minimize dust generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional water absorbent resins are used to achieve high absorption performance, then water absorption capacity is improved, but dust generation increases during production and use
Solution Approach 1:
The patent applies preliminary action by conducting surface crosslinking treatment on the water absorbent resin particles before they are used in absorbent articles. This pre-treatment modifies the surface properties to reduce dust generation during subsequent handling and production processes, while preserving the internal absorption capacity of the particles.
Solution Approach 2:
The patent changes physical and chemical parameters of the water absorbent resin through surface crosslinking, specifically modifying surface morphology and chemical composition. The crosslinking degree, surface area, and surface chemistry are adjusted to optimize both dust suppression and absorption performance, creating a differentiated structure between surface and core properties.
2Object-generated harmful factors
If surface crosslinking is applied to reduce dust generation, then dust suppression is improved, but absorption speed may be affected
Solution Approach 1:
The patent applies local quality by creating a differentiated structure where only the surface layer of the water absorbent resin particles undergoes crosslinking modification, while the internal structure remains unchanged. This localized treatment suppresses dust generation at the surface while preserving the rapid absorption capabilities of the particle core, avoiding the trade-off that would result from bulk modification.
3Quantity of substance
If polyacrylic acid salt content is increased to improve absorption capacity under load, then absorption performance is improved, but particle strength decreases leading to more dust
Solution Approach 1:
The patent applies preliminary action by performing surface crosslinking treatment before the high polyacrylic acid salt content particles are processed into final absorbent articles. This pre-strengthening of the particle surface through crosslinking compensates for the inherent brittleness of high-absorption particles, enabling them to maintain structural integrity during handling while preserving their superior absorption capacity.
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 resulting agent exhibits excellent absorption performance, including high water absorption capacity under load and vertical diffusion absorbency, while significantly reducing dust generation during production and use, thereby improving production efficiency and product performance.
Implementation Method 1
a water absorbent resin in addition to hydrophilic fibers such as pulp fibers is widely used as a constituent material of an absorbent article
Implementation Method 2
vertical diffusion absorbency
Implementation Method 3
a method that includes surface crosslinking and specific processing steps to enhance absorption characteristics and minimize dust generation
Data Source
AI summary
The present invention (a) provides, at low cost, a water absorbing agent (i) that has a suppressed amount of generated dust and a suppressed amount of dust that increases over time and (ii) that also has a high absorption capacity without load, a high absorption capacity under load, a high vertical diffusion absorbency under load, and a high absorbency in a short period of time, and (b) also provides a method for evaluating, in a short period of time, an amount of dust that increases over time. A particulate water absorbing agent of the present invention includes: a surface crosslinked polyacrylic acid (salt)-based water absorbent resin as a main component; a hydrophilic polymer compound; and a stabilizing agent.