Antibacterial Glass Coating Composition for Safe Transparent Appliances
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Solution Overview
Problem
Existing antibacterial glass compositions are limited in application to home appliances due to insufficient dissolution safety and transparency, particularly in kitchen appliances and glass surfaces requiring transparency.
Innovation Solution
An antibacterial glass composition comprising 20-40% SiO2, 1.5-10% B2O3, 2-10% Na2O, 2-15% K2O, 1-5% CaO, and 20-40% ZnO, with optional CuO and Fe2O3, achieving a vitrification temperature of 400-500°C, and a coating thickness of 1-50μm for simultaneous glass film formation and thermal strengthening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ion exchange reaction using potassium nitrate containing silver nitrate is used to provide antibacterial function to glass surface, then antibacterial activity is improved, but dissolution safety deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the glass by incorporating ZnO (20-40 wt%), B2O3 (1.5-10 wt%), and specific ratios of Na2O, K2O, and CaO. This compositional modification alters the glass structure to reduce ion exchange rates with water, thereby improving dissolution safety while maintaining antibacterial activity through the inherent properties of the glass composition itself rather than surface silver ions
Solution Approach 2:
The patent moves away from using silver-based antibacterial agents that leach into the environment, opting instead for a glass composition that provides inherent antibacterial properties through its bulk structure. This eliminates the need for continuous replenishment of silver ions and reduces long-term environmental accumulation of metal ions
2Reliability
If traditional antibacterial glass composition is used, then antibacterial function is achieved, but transparency deteriorates
Solution Approach 1:
The patent optimizes the glass composition parameters including SiO2 (20-40 wt%), B2O3 (1.5-10 wt%), and ZnO (20-40 wt%) to achieve a balance between antibacterial function and optical transparency. The specific ratio of these oxides creates a glass matrix that maintains light transmission while providing inherent antibacterial properties, avoiding the use of excessive metal oxides that would darken the glass
Solution Approach 2:
The patent creates a composite glass material combining multiple oxide components (SiO2, B2O3, ZnO, Na2O, K2O, CaO) in specific proportions. This composite structure leverages the complementary properties of each component: SiO2 and B2O3 provide glass network formation and transparency, while ZnO contributes antibacterial activity and lowers melting temperature, achieving both functionality and optical clarity
3Strength
If ion exchange process is used to strengthen glass and add antibacterial properties, then strength is improved, but application versatility to home appliances deteriorates
Solution Approach 1:
The patent develops a glass composition that simultaneously provides multiple functions: mechanical strengthening through optimized composition, inherent antibacterial activity through ZnO and B2O3, and suitability for home appliance applications through controlled dissolution safety and transparency. This multi-functional glass can be applied to various surfaces including kitchen appliances, bathroom fixtures, and decorative glass without requiring additional processing steps
Solution Approach 2:
The patent modifies the glass composition parameters to achieve a vitrification temperature range of 400-500°C, which is lower than traditional antibacterial glasses. This parameter change enables the glass to be processed at lower temperatures, making it compatible with a wider range of substrates and manufacturing processes used in home appliance production, thereby improving application versatility
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 exhibits excellent antibacterial activity against Staphylococcus aureus and Escherichia coli with 99.99% efficacy, maintaining transparency above 70% and ensuring dissolution safety, while allowing simultaneous glass film formation and thermal strengthening processes.
Implementation Method 1
the dissolution safety could be insufficient Since the color and transparency of the glass are not considered, there is a problem that it cannot be applied to glass shelves and windows requiring transparency
Implementation Method 2
A vitrification temperature Tg of the antibacterial glass composition may be 500° C. or less. The vitrification temperature Tg of the antibacterial glass composition may be preferably 400 to 500° C.
Data Source
AI summary
There is disclosed an antibacterial glass composition, a preparing method of an antibacterial glass coating film using the same and an electric home appliance including the same. The antibacterial glass composition according to the present disclosure and the antibacterial glass coating film using the same are applied to an electric home appliance, thereby exhibiting excellent antibacterial properties and heavy metal elution safety, and exhibiting excellent transmittance (70% or more) when applied to a transparent glass substrate.