Water Absorbing Material Uniform Color Development
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Solution Overview
Problem
Existing water absorbing materials face challenges in achieving uniform and vivid color development for urine testing, are expensive, and have appearance issues due to pigment inhibition, making them difficult to produce inexpensively and effectively.
Innovation Solution
A granular water absorbing material with a coating layer containing a porous adsorbent and a test indicator adsorbed on its micropores, allowing for uniform color change and cost-effective production, where the test indicator is added in a specific range (0.10 wt % to 1.0 wt %) to ensure clear test results and an agreeable appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pH indicator is sprayed onto the surface layer of granular water absorbing material, then the material can test urine, but the color development is not uniform and vivid
Solution Approach 1:
The patent uses a porous adsorbent material with controlled pore structure to uniformly distribute and retain the pH indicator. The porous structure allows the indicator to be evenly dispersed throughout the material matrix, ensuring uniform color development when urine is applied, thereby resolving the issue of non-uniform coloration while maintaining accurate urine testing.
Solution Approach 2:
The patent creates a composite material combining granular water absorbing material with a porous adsorbent and pH indicator. This composite structure integrates the water absorption function, indicator distribution, and color development functions into a single unified material system, achieving both uniform coloration and accurate testing.
2Shape
If a pigment is blended to color the water absorbing material, then the appearance becomes agreeable, but the pigment inhibits the urine test
Solution Approach 1:
The patent applies local quality by using a porous adsorbent material that selectively interacts with the pH indicator while maintaining neutral properties towards urine. The porous structure provides localized sites for indicator binding without introducing pigment-like substances that would interfere with urine chemistry, thus achieving acceptable appearance without test inhibition.
Solution Approach 2:
The patent employs a disposable water absorbing material that changes color permanently upon urine contact. The material is designed to be used once and then discarded, eliminating the need for reversible pigments or dyes that might interfere with testing. The permanent color change is achieved through the pH indicator's chemical response rather than through pigments.
3Measurement precision
If an expensive urine test indicator is used, then the testing function is reliable, but the production cost increases
Solution Approach 1:
The patent uses a porous adsorbent material that can be produced at low cost through conventional manufacturing processes. The porous structure provides high surface area for indicator binding, allowing the use of smaller amounts of expensive pH indicator while maintaining reliable testing function. This reduces overall production cost while preserving test accuracy.
Solution Approach 2:
The patent optimizes parameters such as the pore size distribution, surface area, and indicator loading amount to achieve cost-effective production. By adjusting these parameters, the material can reliably detect urine pH changes while using minimal amounts of expensive indicator, thereby reducing production costs without sacrificing testing reliability.
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 material enables clear and rapid determination of test results with vivid, uniform color development, maintaining an excellent appearance and reducing production costs, while ensuring the test indicator is evenly distributed for effective urine testing.
Implementation Method 1
the excretion test material contains a porous adsorbent having an absorbance of 20 wt % or greater (more preferably 25 wt % or greater) and including micropores, and an excretion test indicator (hereinafter referred to as a 'test indicator') adsorbed on the micropores of the porous adsorbent
Data Source
AI summary
Provided is a water absorbing material having a granular core portion and a coating layer portion coating the granular core portion, which enables a test result after use to be clearly determined by developing vivid and uniform color. In the water absorbing material, the coating layer portion is composed of 90 wt % to 96 wt % of a substrate and 10 wt % to 4 wt % of an excretion test material, the excretion test material contains a porous adsorbent having an adsorbance of 20 wt % or greater and including micropores, and an excretion test indicator adsorbed on the micropores of the porous adsorbent, and the excretion test indicator is added in an amount more than 0.1 wt % and not more than 1.0 wt % relative to the total amount of the coating layer portion.