Water-absorbent resin composition with polyol surface modification
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Solution Overview
Problem
Existing particulate water-absorbent resin compositions face challenges in achieving a balance between liquid permeability and liquid-sucking-up property, as these properties are often antithetical, leading to issues like gel blocking and leakage in sanitary materials such as disposable diapers.
Innovation Solution
A particulate water-absorbent resin composition with a specific particle size distribution and surface modification using tetra- or more functional polyols and tri- or more functional polycations, which enhances both liquid permeability and liquid-sucking-up property by controlling the liquid distribution velocity and surface OH/C ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the particle diameter is enlarged to enhance liquid permeability, then the liquid permeability is improved, but the liquid-sucking-up property deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle size distribution parameters (D10-D90 ratio, average particle diameter within 150-850 μm) and surface properties (OH/C ratio, polyol content) to achieve optimal balance between liquid permeability and liquid-sucking-up property without simply enlarging particles
Solution Approach 2:
The patent uses composite materials by combining water-absorbent resin particles with specific surface modifications (tetra- or more functional polyols, tri- or more functional polycations) to create a composite structure that simultaneously provides good liquid permeability and liquid-sucking-up property
2Quantity of substance
If the amount of water-absorbent resin is increased to increase absorption amount, then the absorption capacity is improved, but gel blocking occurs causing leakage
Solution Approach 1:
The patent applies parameter changes by controlling the particle size distribution (D10-D90 ratio of 1.2 or less, average diameter in 150-850 μm range) and surface chemistry (OH/C ratio, polyol content) to prevent gel blocking while maintaining high absorption capacity
Solution Approach 2:
The patent applies local quality by modifying the surface properties of water-absorbent resin particles with specific functional groups (tetra- or more functional polyols, tri- or more functional polycations) to create localized regions that prevent gel blocking while maintaining overall high 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 composition achieves a significant improvement in both liquid permeability and liquid-sucking-up property, reducing leakage and enhancing the absorption capacity and distribution efficiency in sanitary materials.
Implementation Method 1
liquid permeability and liquid-sucking-up property
Implementation Method 2
surface modification using tetra- or more functional polyols and tri- or more functional polycations
Implementation Method 3
surface modification using tetra- or more functional polyols and tri- or more functional polycations
Data Source
AI summary
An object of the present invention is to provide a particulate water-absorbent resin composition and its production process, wherein the particulate water-absorbent resin composition is an enhanced one in both of the “liquid permeability” and “liquid-sucking-up property” (which have hitherto been antithetical physical properties) of the water-absorbent resin. As a means of achieving this object, a first particulate water-absorbent resin composition according to the present invention is a particulate water-absorbent resin composition comprising a water-absorbent resin (A) of a crosslinked structure obtained by polymerizing an acid-group-containing unsaturated monomer, with the composition being characterized by: having a particle size such that particles in the range of 850 to 150 μm (but not including 850 μm) account for not less than 90 weight % of the entirety; and containing a tetra- or more functional polyol (B) at least on surfaces.