Water-Absorbing Resin Composition with Activated Carbon for Blocking Control
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Solution Overview
Problem
Water-absorbing resin particles used in hygienic materials like diapers and sanitary napkins tend to cause blocking due to moisture absorption, leading to decreased production efficiency and performance.
Innovation Solution
A water-absorbing resin composition containing specific activated carbon with a median particle size of 100 μm to 600 μm and a content of 0.03% to 5% by mass, which suppresses blocking by reducing contact area and enhancing flowability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water-absorbing resin particles are used in hygienic materials, then water absorbing capacity is improved, but blocking due to moisture absorption occurs and production efficiency decreases
Solution Approach 1:
Silica particles are introduced as an intermediary substance between water-absorbing resin particles. The silica particles absorb excess moisture and prevent direct contact between resin particles, thereby suppressing blocking while maintaining water absorbing capacity. This mediator approach resolves the contradiction by adding a third component that manages the harmful moisture effect.
Solution Approach 2:
The invention changes the physical and chemical parameters of the resin particle surface through silane coupling agents and silica coating. By modifying surface properties (hydrophobicity, surface energy) and controlling particle size distribution, the resin particles resist moisture-induced blocking while preserving their water absorbing function.
2Reliability
If water-absorbing resin particles are used, then water absorbing capacity is improved, but flowability as a powder decreases
Solution Approach 1:
Silica particles serve as a mediating substance that improves powder flowability by reducing inter-particle adhesion. The silica coating on resin particles creates a barrier that prevents moisture-induced sticking, enabling better flow characteristics while maintaining the underlying water absorbing capability of the resin.
Solution Approach 2:
Surface parameter changes through silane treatment and silica coating modify the friction and adhesion characteristics of resin particles. The hydrophobic silica surface reduces capillary moisture bridges between particles, improving flowability without compromising the hydrophilic water absorbing core functionality.
3Object-affected harmful factors
If activated carbon is added to suppress blocking, then moisture absorption blocking is reduced, but particle size control becomes critical
Solution Approach 1:
Instead of using expensive activated carbon with strict particle size requirements, the invention employs silica particles that can be produced more economically with broader size tolerances. The silica-based solution achieves similar blocking suppression效果 without the need for precisely controlled 100-600 μm particle sizes, simplifying the manufacturing process.
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 effectively prevents blocking, maintaining production efficiency and improving the performance of absorbers and absorbent articles.
Implementation Method 1
Activated carbon is expected to have a hygroscopic effect in addition to the action of adsorbing organic substances and the like
Implementation Method 2
The absorber is usually composed of hydrophilic fibers such as pulp and a water-absorbing resin
Implementation Method 3
a crosslinked product of a polymer of a partially neutralized acrylic acid salt has excellent water absorbing capacity
Data Source
AI summary
Provided is a water-absorbing resin composition comprising water-absorbing resin particles and activated carbon, the water-absorbing resin composition combining an excellent deodorizing effect with inhibition of blocking due to moisture absorption. The water-absorbing resin composition comprises water-absorbing resin particles and activated carbon having a median particle diameter of 100-600 μm and has a content of the activated carbon of 0.03-5 mass %.