Water-Absorbent Resin Composition for Ammonia Deodorization
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Solution Overview
Problem
Water-absorbent resins used in hygienic materials like diapers and sanitary napkins generate ammonia due to urea decomposition by urease-producing bacteria, despite attempts to inhibit this with organic acids, as the pH buffering action of the resin weakens the urease-inactivating effect.
Innovation Solution
A water-absorbent resin composition combining organic acids and porous deodorants, with specific ratios and proportions, synergistically inhibits urease activity by preventing pH buffering, thus enhancing deodorizing efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If organic acid is used to lower pH and inactivate urease, then deodorizing effect is improved, but pH buffering action of water-absorbent polymer causes pH to shift to neutral side, weakening urease-inactivating action
Solution Approach 1:
A buffer substance is introduced as an intermediary component to work synergistically with the organic acid. The buffer substance maintains pH stability and prevents the pH from shifting to neutral, thereby enhancing and sustaining the urease-inactivating effect of the organic acid throughout the absorption process
Solution Approach 2:
The invention creates a composite deodorizing system combining organic acid, buffer substance, and optionally porous deodorant materials. This composite approach allows the organic acid to lower pH while the buffer prevents pH rebound, achieving sustained urease inactivation and superior deodorizing performance
2Quantity of substance
If water-absorbent polymer particles are used to absorb urine, then absorption capacity is improved, but pH buffering action weakens organic acid effectiveness
Solution Approach 1:
The buffer substance acts as an intermediary that counteracts the pH buffering action of the water-absorbent polymer particles. By introducing this additional buffer component, the system maintains acidic pH conditions even as the polymer absorbs urine and attempts to neutralize the environment
Solution Approach 2:
The invention changes the pH parameter control strategy by adding a buffer substance that specifically targets and stabilizes the pH in the acidic range. This allows the system to maintain pH below 7.0 during urine absorption, preventing urease activation while preserving 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 effectively reduces ammonia generation by ensuring the urease-inactivating action of organic acids is maintained, providing superior deodorizing performance.
Implementation Method 1
the pH buffering action by the water-absorbent polymer particles in the absorbent material causes the pH of urine lowered by the organic acid to shift to the neutral side
Implementation Method 2
a porous deodorant... exhibits a high deodorizing function against ammonia
Data Source
Figure 1
AI summary
There is provided a water-absorbent resin composition having an excellent deodorizing effect. A water-absorbent resin composition comprising an organic acid, a porous deodorant, and water-absorbent polymer particles, wherein a ratio (X/Y) of an amount X (parts by mass) of the organic acid to an amount Y (parts by mass) of the porous deodorant is 1.0 or more, and wherein a sum (x + y) of a content x (% by mass) of the organic acid and a content y (% by mass) of the porous deodorant in the total water-absorbent resin composition is 0.5% by mass or more.