Interlayer Film Heat Shielding Stability
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Solution Overview
Problem
Conventional interlayer films for laminated glass, such as those containing tin-doped indium oxide particles, antimony-doped tin oxide particles, or tungsten oxide particles, often compromise visible light transmittance over time, especially under high temperature environments, while struggling to maintain both high heat shielding and visible light transmittance simultaneously.
Innovation Solution
An interlayer film comprising a thermoplastic resin, heat shielding particles like tungsten oxide or tin-doped indium oxide, and a corrosion inhibitor, optionally including phthalocyanine compounds, is used to enhance heat shielding properties and maintain high visible light transmittance over a long period, with specific formulations like polyvinyl acetal resins and plasticizers improving adhesive properties and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If heat shielding particles (ITO, ATO, or tungsten oxide) are added to enhance heat shielding properties, then heat shielding performance is improved, but visible light transmittance is lowered over time especially under high temperature environments
Solution Approach 1:
A corrosion inhibitor is introduced as an intermediary substance to protect the heat shielding particles from degrading the polymer matrix. The corrosion inhibitor forms a protective barrier around the particles, preventing them from causing yellowing and transmittance degradation over time, thus resolving the contradiction between heat shielding performance and long-term optical stability
Solution Approach 2:
The invention changes the chemical environment parameters by adding specific corrosion inhibitors (phosphates, carboxylic acids, or their esters) to prevent harmful chemical reactions between heat shielding particles and the polymer matrix. This parameter change maintains both high heat shielding performance and stable visible light transmittance over time
2Object-affected harmful factors
If tungsten oxide particles are used for heat shielding, then heat shielding properties are enhanced, but visible light transmittance is significantly lowered after long period use under high temperature
Solution Approach 1:
The corrosion inhibitor acts as a mediator between tungsten oxide particles and the polymer matrix, preventing direct harmful interactions. This intermediary substance stabilizes the interface, allowing tungsten oxide to maintain its heat shielding function without causing progressive transmittance degradation over extended periods under high temperature conditions
3Object-affected harmful factors
If heat shielding particles are added to achieve high heat shielding properties, then infrared ray blocking is improved, but both high heat shielding and high visible light transmittance cannot be achieved simultaneously
Solution Approach 1:
The invention modifies the chemical parameters of the interlayer film system by introducing corrosion inhibitors that prevent yellowing reactions. This allows the heat shielding particles to maintain their infrared blocking capability while the visible light transmittance remains stable and high, achieving both objectives simultaneously through controlled chemical environment parameters
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 interlayer film effectively enhances heat shielding and maintains high visible light transmittance, reducing solar transmittance and scorching sensations, while improving sensor detection accuracy through optimized light transmittance at specific wavelengths, thus addressing the limitations of previous technologies.
Implementation Method 1
the energy amount of an infrared ray with a wavelength greater than or equal to 780 nm which is longer than that of visible light is small as compared with an ultraviolet ray. However, the thermal action of infrared rays is large, and when infrared rays are absorbed into a substance, heat is released from the substance.
Implementation Method 2
an interlayer film for laminated glass including a thermoplastic resin, heat shielding particles and a corrosion inhibitor
Data Source
Figure 1~2
AI summary
There is provided an interlayer film for laminated glass which is capable of maintaining the visible light transmittance high over a long period of time since the interlayer film is high in heat shielding properties, and furthermore, is excellent in heat resistance. The interlayer film for laminated glass according to the present invention includes a thermoplastic resin, heat shielding particles and a corrosion inhibitor, and the corrosion inhibitor is a corrosion inhibitor represented by the following formula (11): in the foregoing formula (11), R1 to R4 each represent a hydrogen atom or a methyl group, and R5 represents a hydrogen atom or an organic group having 1 to 30 carbon atoms and containing no nitrogen atom.