Coating composition having high light transmittance, coating glass and method for preparation thereof, and cooking appli-ance using same
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cooking appliance door glass coatings have low light transmittance, making it difficult for users to observe cooking processes, and are not suitable for low-temperature cleaning methods due to high-temperature cleaning requirements.
Innovation Solution
A coating composition comprising 20-40 wt% phosphorus pentoxide, 15-30 wt% aluminum oxide and zirconium dioxide, 10-30 wt% sodium and potassium oxide, 10-25 wt% boron trioxide, and 10-15 wt% zinc oxide, with optional lithium, barium, or calcium oxides, applied at a calcination temperature of 600-700°C, ensuring high light transmittance and effective contaminant removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating layer is disposed on the door glass to help remove contaminants, then cleaning performance is improved, but light transmittance decreases making it difficult for users to clearly observe cooking processes
Solution Approach 1:
The patent changes the chemical composition parameters of the coating layer by specifying precise weight ratios of phosphorus pentoxide (20-40 wt%), aluminum oxide (15-30 wt%), boron trioxide (10-25 wt%), and other oxides. This compositional parameter optimization enables the coating to achieve both high cleaning performance and high light transmittance (>80%) simultaneously, resolving the contradiction between cleaning effectiveness and optical clarity.
Solution Approach 2:
The patent creates a composite glass coating material by combining multiple oxide components in specific proportions. The composite structure of phosphorus pentoxide, aluminum oxide, boron trioxide, zinc oxide, and other ingredients produces a coating that exhibits both excellent contaminant removal properties and high transparency, allowing the coating to fulfill dual functions that would be impossible with a single material.
2Reliability
If a conventional coating is cleaned under high temperature or soaking conditions, then cleaning effectiveness is improved, but the glass door cannot be soaked in water and cannot withstand high temperature cleaning
Solution Approach 1:
The patent modifies the thermal and chemical parameters of the coating composition by incorporating specific ratios of phosphorus pentoxide, boron trioxide, and other heat-resistant oxides. These compositional changes enable the coating to maintain its cleaning effectiveness under low-temperature conditions while becoming compatible with gentle cleaning methods such as water soaking, thus expanding the range of applicable cleaning procedures without sacrificing performance.
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 coating composition achieves high visible light transmittance (>80%) and excellent cleaning performance, allowing users to clearly observe cooking processes while being compatible with low-temperature cleaning methods without compromising durability.
Implementation Method 1
a coating layer may have a low light transmittance in which users may not be able to clearly look into the cooking appliance
Implementation Method 2
applied at a calcination temperature of 600-700°C
Data Source
Figure 1~2
AI summary
A cooking appliance includes a cooking chamber, a door that is configured to open and close the cooking chamber and has a door glass, a coating layer that is disposed at least one surface of the door glass and made of a coating composition. The coating composition includes 20 to 40 wt% of phosphorus pentoxide (P2O5), 15 to 30 wt% of aluminum oxide (Al2O3) and zirconium dioxide (ZrO2), 10 to 30 wt% of sodium oxide (Na2O) and potassium oxide (K2O), 10 to 25 wt% of boron trioxide (B2O3), and 10 to 15 wt% of zinc oxide (ZnO).