Water-absorbent resin with surface activated carbon for odor control
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Solution Overview
Problem
Existing water-absorbent resin compositions used in hygienic materials like diapers and sanitary napkins often produce unpleasant odors due to the absorption of body fluids, and current methods to mitigate this, such as using organic amine compounds, are not entirely effective in eliminating odors.
Innovation Solution
A water-absorbent resin composition combining water-absorbent resin particles with activated carbon, where the activated carbon is disposed on the surface of the resin particles, enhancing the deodorizing effect by increasing the heat release rate during physiological saline absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If activated carbon is added to water-absorbent resin to improve deodorizing effect, then odor removal capability is improved, but heat release rate control becomes difficult
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle size distribution of activated carbon (D10≥5μm, D50≥10μm, D90≤50μm) and its content (0.1-5 mass%) to achieve optimal heat release rate (0.05-0.5°C/sec) while maintaining effective deodorizing capability. This parameter optimization resolves the contradiction between odor removal and temperature control.
Solution Approach 2:
The patent creates a composite material system combining water-absorbent resin particles with activated carbon particles having specific size distribution. This composite structure allows the activated carbon to effectively adsorb odors while the controlled particle size ensures proper heat release characteristics, resolving the contradiction between deodorizing effect and thermal management.
2Object-affected harmful factors
If activated carbon content is increased to enhance deodorizing effect, then odor absorption capacity is improved, but water absorption rate may be affected
Solution Approach 1:
The patent optimizes the content parameter of activated carbon to 0.1-5 mass% of the total absorbent material. This parameter control ensures sufficient odor absorption capacity while maintaining high water absorption rate, as the activated carbon particles with controlled size distribution do not significantly interfere with the water-absorbent resin's hydration process.
Solution Approach 2:
The patent applies local quality by using activated carbon particles with specific size distribution (D10≥5μm, D50≥10μm, D90≤50μm) that provides effective odor adsorption at the particle surfaces while allowing water to penetrate and be absorbed by the water-absorbent resin particles in the bulk, thus maintaining water absorption rate while enhancing deodorizing effect.
3Object-affected harmful factors
If activated carbon particle size is reduced to increase surface area for odor adsorption, then deodorizing effect is improved, but heat release rate increases excessively
Solution Approach 1:
The patent precisely controls the particle size parameters of activated carbon (D10≥5μm, D50≥10μm, D90≤50μm) to achieve an optimal balance. This parameter optimization provides sufficient surface area for effective odor adsorption while preventing excessive heat release rate, maintaining it within 0.05-0.5°C/sec during water absorption.
Solution Approach 2:
The patent replaces the conventional approach of using very fine activated carbon particles with a controlled particle size distribution system. This substitution maintains adequate surface area for odor adsorption while the larger minimum particle sizes (D10≥5μm) prevent excessive heat generation, effectively resolving the contradiction between deodorizing effect and thermal control.
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 an excellent deodorizing effect by effectively managing odor production, as demonstrated by a heat release rate of 0.10° C./sec or more and 1.00° C./sec or less when absorbing physiological saline, significantly reducing unpleasant odors in absorbent articles.
Implementation Method 1
activated carbons are known as adsorbents having an excellent deodorizing effect
Implementation Method 2
water-absorbent resin particles and an activated carbon disposed on surfaces of the water-absorbent resin particles, wherein when, while stirring 50 g of physiological saline at 24.9° C. at 600 rpm in a 300 mL thermally insulated container, 10 g of the water-absorbent resin composition is added and swollen
Implementation Method 3
water-absorbent resin particles...absorbed and retains a body liquid
Implementation Method 4
the water-absorbent resin composition has a heat release rate of 0.10° C./sec or more and 1.00° C./sec or less until temperature increases by 2° C.
Data Source
AI summary
Provided is a water-absorbent resin composition comprising water-absorbent resin particles and an activated carbon, which has an excellent deodorizing effect. A water-absorbent resin composition, comprising water-absorbent resin particles and an activated carbon disposed on surface of the water-absorbent resin particles, wherein when, while stirring 50 g of physiological saline at 24.9° C. at 600 rpm in a 300 mL thermally insulated container, 10 g of the water-absorbent resin composition is added and swollen, the water-absorbent resin composition has a heat release rate of 0.10° C./sec or more and 1.00° C./sec or less until temperature increases by 2° C.