Laminated Glass Interlayer Film Near-Infrared Absorption
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Solution Overview
Problem
Conventional interlayer films for laminated glass containing ITO or ATO particles fail to adequately absorb near-infrared rays, limiting the enhancement of heat insulation properties, and struggle to achieve both low Total Solar Transmittance (Tts) and high visible transmittance simultaneously, which is necessary for compliance with energy efficiency standards like the Cool Cars Standards.
Innovation Solution
An interlayer film comprising a polyvinyl acetal resin, plasticizer, heat insulating particles, and compounds such as phthalocyanine or naphthalocyanine, with specific weight ratios and amounts, to enhance heat insulation and visible transmittance, allowing for the production of laminated glass that meets stringent energy efficiency requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If ITO particles or ATO particles are added to the interlayer film, then heat insulation property is improved, but near-infrared ray absorption is insufficient
Solution Approach 1:
The patent combines ITO or ATO particles with organic infrared absorbing compounds (phthalocyanine, naphthalocyanine, or anthracyanine) to create a composite interlayer film. This composite approach allows the inorganic particles to provide basic heat insulation while the organic compounds specifically enhance near-infrared absorption, thereby resolving the insufficiency of near-infrared ray absorption when using only ITO or ATO particles.
Solution Approach 2:
The patent specifies precise compositional parameters: the organic compound content is 0.01-5 parts by weight per 100 parts by weight of thermoplastic resin, and the ITO or ATO particle content is 0.1-10 parts by weight per 100 parts by weight of thermoplastic resin. By controlling these parameters within specific ranges, the patent optimizes both heat insulation property and near-infrared absorption, achieving compliance with Cool Cars Standards.
2Loss of energy
If heat reflecting PET is used to reflect infrared rays, then heat insulation is improved, but communication waves are also reflected
Solution Approach 1:
The patent uses organic infrared absorbing compounds that specifically target the infrared region of the electromagnetic spectrum. These compounds have absorption characteristics localized to infrared wavelengths, allowing them to absorb heat rays while transmitting communication waves (radio frequencies) and visible light, thereby achieving selective spectral control.
Solution Approach 2:
The patent employs organic compounds (phthalocyanine, naphthalocyanine, anthracyanine) that can be incorporated into the interlayer film at low concentrations (0.01-5 parts by weight per 100 parts resin). These organic additives provide effective infrared absorption without the need for expensive metallic coatings or complex multi-layer structures, offering a cost-effective solution.
3Loss of energy
If Total Solar Transmittance is reduced to meet Cool Cars Standards, then heat insulation is improved, but visible transmittance may be compromised
Solution Approach 1:
The patent uses organic infrared absorbing compounds at very low concentrations (0.01-5 parts by weight per 100 parts thermoplastic resin). This low dosage is sufficient to absorb infrared radiation while having minimal impact on visible light transmission, allowing the interlayer film to reduce Tts to meet Cool Cars Standards while maintaining high visible transmittance for adequate illumination.
Solution Approach 2:
The organic compounds (phthalocyanine, naphthalocyanine, anthracyanine) have specific absorption characteristics in the infrared region while remaining relatively transparent in the visible region. This selective optical property allows the patent to modify the solar transmission profile by absorbing infrared energy without significantly altering visible light transmission, thus maintaining good illumination properties.
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 reduces Total Solar Transmittance while maintaining high visible transmittance, enabling compliance with energy efficiency standards and providing improved heat insulation performance.
Implementation Method 1
at least one compound selected from the group consisting of a phthalocyanine compound, a naphtalocyanine compound, and an anthracyanine compound
Implementation Method 2
infrared rays having a wavelength of 780 nm or more... infrared rays have a large thermal effect and are released as heat once absorbed in a substance
Implementation Method 3
heat insulating particles
Implementation Method 4
heat insulating particles
Implementation Method 5
a polyvinyl acetal resin; a plasticizer
Data Source
Figure 1
AI summary
The present invention provides an interlayer film for laminated glass which provides a laminated glass with excellent heat insulation property and high visible transmittance. An interlayer film 2 for laminated glass of the present invention comprises: a thermoplastic resin; a plasticizer; heat insulating particles; and at least one compound selected from the group consisting of a phthalocyanine compound, a naphtalocyanine compound, and an anthracyanine compound. When an amount A represents the amount of the heat insulating particles to 100 parts by weight of the thermoplastic resin and an amount B represents the amount of the compound to 100 parts by weight of the thermoplastic resin, the amount A is 0.1 to 3 parts by weight and a ratio of the amount A to the amount B (the amount A/ the amount B) is 3 to 2000.