Infrared Shielding Coating for Glass Substrates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing infrared shielding films for glass substrates lack sufficient film hardness and abrasion resistance while maintaining high visible light transmission and infrared shielding properties, especially in environments prone to scratches like automobile windows.
Innovation Solution
A coating comprising transparent oxide particles with an average primary particle diameter of 100 nm or less, an epoxy resin with a naphthalene skeleton, and a hydrolyzed condensate of silicon alkoxide, applied at specific mass ratios to ensure high film hardness and abrasion resistance without compromising visible light transmission or infrared shielding efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional infrared shielding films are used to achieve high visible light transmission and infrared shielding properties, then optical performance is improved, but film hardness and abrasion resistance deteriorate
Solution Approach 1:
The patent uses a composite coating system consisting of a first layer containing transparent conductive oxide particles (ITO, IZO, or INO) dispersed in a silicon oxide matrix, and a second layer containing silicon oxide, silicon oxynitride, and silicon nitride. This composite structure allows the first layer to provide optical performance (high visible light transmission and infrared shielding) while the second layer provides enhanced film hardness and abrasion resistance, thus resolving the contradiction between optical performance and mechanical durability.
2Object-affected harmful factors
If transparent conductive oxide particles are dispersed in silicon oxide matrix to achieve infrared shielding, then infrared shielding properties are improved, but film hardness and abrasion resistance worsen
Solution Approach 1:
The patent creates a composite structure where the first layer (containing transparent conductive oxide particles in silicon oxide matrix) provides infrared shielding properties, while the second layer (containing silicon oxide, silicon oxynitride, and silicon nitride) provides enhanced film hardness and abrasion resistance. The multi-layer composite design allows each layer to specialize in providing its specific function, resolving the contradiction between infrared shielding performance and mechanical durability.
3Ease of manufacture
If a single-layer infrared shielding film is applied to glass substrate, then manufacturing process is simplified, but film hardness and abrasion resistance are insufficient
Solution Approach 1:
The patent divides the infrared shielding film into two distinct layers: a first layer containing transparent conductive oxide particles for infrared shielding, and a second layer containing silicon nitride and silicon oxynitride for enhanced hardness and abrasion resistance. This segmentation allows each layer to be optimized for its specific function while maintaining a relatively simple manufacturing process using conventional coating and firing techniques.
4Illumination intensity
If transparent conductive oxide particles with small diameter are used to improve visible light transmission, then optical clarity is improved, but radio wave transmission properties worsen
Solution Approach 1:
The patent specifies that the transparent conductive oxide particles should have an average primary particle diameter of 100 nm or less (preferably 10 to 50 nm). This parameter control ensures high visible light transmission by minimizing light scattering while maintaining adequate radio wave transmission properties through the specific particle size range and composition ratios of the transparent conductive oxide particles to silicon oxide.
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 achieves high visible light transmission, excellent infrared shielding, and enhanced radio wave transmission with improved film hardness and abrasion resistance, ensuring durability and effectiveness on glass or resin substrates.
Implementation Method 1
an infrared shielding film having high visible light transmission properties and infrared shielding properties
Implementation Method 2
high visible light transmission properties
Implementation Method 3
a binder containing an epoxy resin having a naphthalene skeleton in a molecular structure, and a hydrolyzed condensate of a silicon alkoxide
Implementation Method 4
a binder containing an epoxy resin having a naphthalene skeleton in a molecular structure, and a hydrolyzed condensate of a silicon alkoxide
Data Source
Figure 1~2
AI summary
The coating for forming an infrared shielding film according to the invention contains: transparent oxide particles having an average primary particle diameter of 100 nm or less; and a binder containing an epoxy resin having a naphthalene skeleton in a molecular structure, a hydrolyzed condensate of a silicon alkoxide, and a solvent, wherein a mass ratio of the transparent oxide particles to a solid content of the binder after drying and curing (transparent oxide particles/solid content of binder after drying and curing) is 5/95 to 80/20, and in the case where the solid content of the binder after drying and curing is set to 100 mass%, the amount of the epoxy resin is 40 to 90 mass% and the amount of the hydrolyzed condensate of a silicon alkoxide is 10 to 60 mass%.