Soda Lime Glass Composition for Low Solar Transmittance
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Solution Overview
Problem
Existing heat-ray- and ultraviolet-absorbing glass plates face challenges in achieving predetermined optical properties and minimizing bubble formation, with issues related to sulfur content and the use of cerium as an ultraviolet-absorbing material, which affects visible and ultraviolet light transmittance ratios and color stability.
Innovation Solution
A soda lime glass composition with specific ranges of total iron, tin, cerium, and sulfur, along with controlled ratios of divalent iron to total iron and tin to sulfur, is used to achieve high visible light transmittance, low solar and ultraviolet transmittance, and reduced bubble formation, while maintaining a gray color tone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfur is contained in the glass composition to reduce bubble formation, then bubble quality improves, but amber coloring increases and visible light transmittance decreases
Solution Approach 1:
The patent optimizes the sulfur content parameter to a specific range (0.003% to 0.1%) and controls the FeO/Fe2O3 ratio (50% or more) to balance bubble reduction with minimal amber coloring. This parameter optimization allows achieving good bubble quality while maintaining acceptable visible light transmittance.
Solution Approach 2:
The patent creates a composite glass system combining multiple components (soda lime base glass, iron, selenium, cobalt, titanium dioxide, and sulfur) where each component contributes specific properties. The synergistic interaction among these components achieves both bubble control and optical property optimization.
2Object-affected harmful factors
If cerium is added as an ultraviolet-absorbing material, then ultraviolet transmittance decreases, but visible light transmittance and color stability are affected
Solution Approach 1:
The patent controls cerium content within a specific range (0.01% to 2.9%) and optimizes the FeO/Fe2O3 ratio (50% or more) to compensate for any color shifts. This parameter control ensures ultraviolet absorption while maintaining color stability and visible light transmittance.
Solution Approach 2:
The patent uses multiple coloring components (iron, selenium, cobalt, titanium dioxide) with different local functions: iron for heat-ray absorption, selenium and cobalt for color stabilization, and titanium dioxide for ultraviolet absorption enhancement. Each component targets specific spectral regions to achieve overall optical optimization.
3Illumination intensity
If the FeO/Fe2O3 ratio is increased to improve visible light transmittance, then Tv/Te ratio improves, but amber coloring increases and gray color tone is compromised
Solution Approach 1:
The patent optimizes the FeO/Fe2O3 ratio to be 50% or more while controlling total iron content (0.05% to 0.32%) and adding small amounts of selenium (0.0001% to 0.0050%) and cobalt (0.00005% to 0.0030%). This multi-parameter optimization achieves high visible light transmittance while maintaining gray color tone and suppressing amber coloring.
Solution Approach 2:
The patent introduces selenium and cobalt as intermediary components that work with iron to stabilize the gray color tone. These intermediaries help maintain the desired color characteristics even when the FeO/Fe2O3 ratio is optimized for high visible light transmittance.
4Object-affected harmful factors
If total iron content is increased to reduce solar transmittance, then solar transmittance decreases, but visible light transmittance also decreases and Tv/Te ratio is compromised
Solution Approach 1:
The patent optimizes total iron content within a specific range (0.05% to 0.32%) and controls the FeO/Fe2O3 ratio (50% or more) to ensure high visible light transmittance. Simultaneously, small amounts of selenium and cobalt are added to enhance solar absorption while maintaining color stability, achieving low solar transmittance without significantly reducing visible light transmittance.
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 solution results in a glass plate with improved optical properties, including a high visible light transmittance ratio, low solar and ultraviolet transmittance, and minimal bubble formation, effectively addressing the challenges of achieving desired optical characteristics and color stability.
Implementation Method 1
a heat-ray- and ultraviolet-absorbing glass plate... having a mass proportion of divalent iron calculated as Fe2O3 to the total iron calculated as Fe2O3 being 50% or more, a visible light transmittance Tv... being 66% or more... a solar transmittance Te... being 65% or less... an ultraviolet transmittance Tuv... being 50% or less
Data Source
AI summary
The present invention aims to provide a heat-ray- and ultraviolet-absorbing glass plate having low solar transmittance and ultraviolet transmittance, having a high visible light transmittance, and containing a small amount of bubbles. The present invention relates to a heat-ray- and ultraviolet-absorbing glass plate that is a soda lime glass having a specific composition, having a mass proportion of divalent iron to the total iron being 50% or more, and having, as a value calculated as 4 mm thickness of the glass plate, a visible light transmittance Tv of 66% or more, a solar transmittance Te of 65% or less, a ratio Tv/Te of Tv and Te of 1.3 or more, and an ultraviolet transmittance Tuv of 50% or less.