Low-reflection Coated Glass Sheet with Silica-Titania Composite
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Solution Overview
Problem
Low-reflection coated glass sheets lack high abrasion resistance and photocatalytic properties, which are essential for environments with foreign matter and organic adhesion issues, as existing technologies do not adequately address these requirements.
Innovation Solution
A low-reflection coated glass sheet with a coating containing silica as a binder, fine silica particles, and fine titania particles, where the coating has a transmittance gain of 1.7% or more and includes 25-43% silica, 40-64% fine silica particles, and 10-20% fine titania particles, providing enhanced abrasion resistance and photocatalytic properties when irradiated with light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a low-reflection coating is formed on a glass sheet to increase light transmittance, then the transmittance gain is improved, but the abrasion resistance deteriorates
Solution Approach 1:
The patent applies composite materials by combining multiple components in the low-reflection coating: silica particles (providing abrasion resistance), titania particles (providing photocatalytic activity), and a binder resin (providing adhesion and structural integrity). This composite structure allows the coating to simultaneously achieve high light transmittance, abrasion resistance, and photocatalytic properties that individual materials cannot provide alone.
2Quantity of substance
If a low-reflection coating is formed on a glass sheet to increase light transmittance, then the transmittance gain is improved, but the photocatalytic properties are insufficient
Solution Approach 1:
The patent incorporates titania particles as a key component of the low-reflection coating. Titania exhibits photocatalytic activity when exposed to light, enabling the coating to decompose organic substances adhering to the glass surface. The composite structure with titania particles provides both the optical properties needed for high transmittance and the catalytic properties needed for self-cleaning functionality.
3Reliability
If organic matter adheres to the low-reflection coating, then the coating provides protection, but the adhesion of organic matter increases making cleaning difficult
Solution Approach 1:
The patent utilizes the photocatalytic oxidation capability of titania particles in the coating. When exposed to light, the titania generates reactive oxygen species that oxidize and decompose organic substances adhering to the coating surface. This accelerated oxidation process converts adhered organic matter into easily removable compounds, enabling simple cleaning with water without compromising the coating's protective function.
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 achieves high abrasion resistance and photocatalytic properties, allowing for increased light transmittance and easy removal of organic matter, making it suitable for environments with foreign matter and improving the functionality of glass sheets in photoelectric conversion devices.
Implementation Method 1
A low-reflection coated glass sheet includes a glass sheet and a low-reflection coating formed on at least a portion of one principal surface of the glass sheet
Implementation Method 2
the low-reflection coating contains 25 mass % to 43 mass % of the silica of the binder, 40 mass % to 64 mass % of the fine silica particles, and 10 mass % to 20 mass % of the fine titania particles
Data Source
AI summary
A low-reflection coated glass sheet of the present invention includes a glass sheet and a low-reflection coating. The low-reflection coating is formed on at least a portion of one principal surface of the glass sheet, and contains a binder containing silica as a main component, fine silica particles bound by the binder, and fine titania particles bound by the binder. For the low-reflection coated glass sheet, a transmittance gain is 1.7% or more. The low-reflection coating contains 25 mass % to 43 mass % of the silica which is the main component of the binder, 40 mass % to 64 mass % of the fine silica particles, and 10 mass % to 20 mass % of the fine titania particles, based on the total mass of the low-reflection coating. As such, the low-reflection coated glass sheet of the present invention has high abrasion resistance and is capable of exhibiting photocatalytic properties and hydrophilicity when irradiated with light.