Mixed Antibacterial Glass for Stable Silver Ion Elution
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Solution Overview
Problem
Existing antibacterial glasses for air conditioning systems face challenges in stabilizing silver ion elution amounts due to pH fluctuations, leading to excessive ion release and potential water pollution and equipment deterioration.
Innovation Solution
A mixed antibacterial glass comprising an alkaline glass and an acidic glass, carefully formulated and mixed to control silver ion elution within specific ranges, reducing pH dependence and maintaining stable ion release over extended periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a water-soluble glass containing P2O5 is used as an antibacterial agent, then the silver ion elution amount increases, but the pH of drain water shifts to acidic range causing excessive dissolution and unstable silver ion release
Solution Approach 1:
The patent combines phosphate glass (providing silver ion release) with borosilicate glass (providing alkalinity and pH stability) to create a composite glass material. This composite structure allows the system to maintain both high silver ion elution and stable pH levels, resolving the contradiction between quantity of silver ions and pH stability. The borosilicate component acts as a buffer that prevents excessive acidification while the phosphate component ensures adequate silver ion release for antibacterial effectiveness.
2Quantity of substance
If the supply of condensed water for diluting drain water is stopped, then the pH shifts to acidic range, but this accelerates glass dissolution and causes excessive silver ion elution
Solution Approach 1:
The borosilicate glass component provides beforehand cushioning by maintaining alkaline conditions in advance. This alkaline buffer capacity is built into the glass composition itself, creating a reserve that cushions against pH drops when condensed water supply stops. The pre-built alkaline reserve prevents the acceleration of glass dissolution that would otherwise occur under acidic conditions, ensuring reliable and controlled silver ion release regardless of water supply variations.
3Quantity of substance
If alkaline components such as sodium, potassium, and lithium are added to increase silver ion elution, then the pH shifts to alkaline range, but this accelerates glass dissolution and causes excessive silver ion release
Solution Approach 1:
The patent changes the chemical composition parameters of the glass by incorporating specific ratios of borosilicate to phosphate components. This parameter change creates a balanced system where the borosilicate's alkaline properties counterbalance the phosphate's tendency toward acidification. The controlled composition parameters ensure that silver ion elution remains high while pH stays stable, preventing the runaway dissolution that occurs with excessive alkaline additives.
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 mixed glass effectively stabilizes silver ion release, preventing microbial growth in air conditioning systems while adhering to water pollution standards and reducing equipment degradation.
Implementation Method 1
the silver ion elution amount from the antibacterial glass showing alkalinity being from 0.005 to 1 mg/(g·1 liter, 24 Hrs, 30° C.) as measured under certain conditions, the silver ion elution amount from the antibacterial glass showing acidity being from 0.005 to 1 mg/(g·1 liter, 24 Hrs, 30° C.)
Data Source
AI summary
A mixed antibacterial glass which stably controls the silver ion elution amount from the antibacterial glass into the drain water in an air conditioning system, thereby effectively preventing the occurrence of microorganisms in the drain water. The mixed antibacterial glass achieves antibacterial effect by releasing silver ions, and contains an antibacterial glass which shows alkalinity when dissolved, and another antibacterial glass which shows acidity when dissolved, the silver ion elution amounts from the antibacterial glasses showing alkalinity or acidity being within certain ranges as measured under certain conditions, the compounding amount of the antibacterial glass showing alkalinity being from 10 to 100 parts by weight with reference to 100 parts by weight of the antibacterial glass showing acidity, and the total silver ion elution amount being within a certain range as measured under certain conditions.