Laminated Glass Interlayer with Titanium Oxide Particles for Heat Insulation
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Solution Overview
Problem
Conventional laminated glasses with interlayer films containing opacifiers fail to provide sufficient heat insulating properties while maintaining visual privacy and allowing visible light transmission.
Innovation Solution
An interlayer film comprising polyvinyl acetal resin, plasticizer, and titanium oxide particles with specific size and dispersion density is used, which enhances heat insulation while ensuring visible light transmission and privacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an interlayer film containing an opacifier such as calcium carbonate is used, then visual identification of persons or objects behind the glass is prevented, but heat insulating property is insufficient
Solution Approach 1:
The patent changes the particle size parameter of titanium oxide from conventional small sizes to specifically 0.4-2 μm, and controls dispersion density at 2.0×10^5 particles/cm² or more. This parameter optimization enables the interlayer film to simultaneously achieve privacy protection through light scattering and heat insulation by reflecting infrared rays, resolving the contradiction between visual privacy and thermal insulation performance.
Solution Approach 2:
The patent uses a composite interlayer film comprising polyvinyl acetal resin, plasticizer, dispersant, and titanium oxide particles. This composite material structure combines the adhesive properties of polyvinyl acetal resin with the optical and thermal properties of titanium oxide particles, achieving both privacy protection and heat insulation functionality that cannot be achieved with conventional opacifiers alone.
2Temperature
If titanium oxide particles with larger size are used to improve heat insulation, then visible light transmission is reduced, but if smaller particles are used, heat insulation is insufficient
Solution Approach 1:
The patent precisely optimizes the particle size parameter of titanium oxide to 0.4-2 μm and controls the dispersion density at 2.0×10^5 particles/cm² or more. This specific parameter range creates the optimal balance where particles are large enough to reflect infrared rays for heat insulation but small and sufficiently dispersed to allow visible light transmission, preventing both excessive opacity and insufficient heat insulation.
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 achieves excellent heat insulating properties and visible light transmission, addressing the limitations of conventional laminated glasses by optimizing the dispersion of titanium oxide particles within the polyvinyl acetal resin matrix.
Implementation Method 1
titanium oxide particles, which are dispersed so as to have an average long diameter of 0.4 to 2 μm and a dispersion density of 2.0 × 10^5
Implementation Method 2
a heat insulating property is required in a laminated glass used in a building for controlling a rise in room temperature by insulating infrared rays
Data Source
AI summary
It is an object of the present invention to provide an interlayer film for a laminated glass not allowing visual identification of persons or objects behind the glass while transmitting a certain amount of visible light and having an excellent heat insulating property. The present invention is an interlayer film for a laminated glass, which comprises a polyvinyl acetal resin, a plasticizer, a dispersant, and titanium oxide particles, the titanium oxide particles being dispersed so as to have an average long diameter of 0.4 to 2 µm and a dispersion density of 2.0 × 105 to 7.0 × 105 particles/cm2.