Laminated Glass Heat-Shielding via Low-Plasticizer PVB Coating
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Solution Overview
Problem
Existing methods for producing laminated glass with heat-shielding properties face challenges such as the need for multiple film layers, adverse adhesion effects, and optical unevenness due to the use of thin PET films and PVB films, which affect safety and thickness requirements for automotive and architectural windows.
Innovation Solution
A laminated glass structure comprising a polymer film coated with low-plasticizer polyvinyl acetal, sandwiched between layers of plasticizer-containing polyvinyl acetal, where the polymer film can be directly melted onto glass surfaces, enhancing penetration resistance and heat-shielding capabilities without compromising safety and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thin PET films are used for heat-shielding laminated glass, then heat-shielding properties are improved, but the number of film layers must be increased to at least 3 layers
Solution Approach 1:
The patent changes the chemical composition parameters of the PVB film by incorporating specific additives (silane-modified PVB, titanium dioxide, zinc oxide) to enable direct melting onto glass surfaces, eliminating the need for multiple PET layers while maintaining heat-shielding functionality
Solution Approach 2:
The patent creates a composite PVB film system combining polyvinyl butyral with silane modifiers and metal oxide particles (titanium dioxide, zinc oxide) to achieve both the melting capability and heat-shielding properties that previously required separate functional layers
2Temperature
If PVB films are printed with heat-absorbing nanoparticles, then heat-shielding properties are improved, but adhesion properties to glass surface are adversely affected
Solution Approach 1:
The patent applies functional modifications locally within the PVB film structure, concentrating heat-absorbing nanoparticles and silane modifiers in specific regions to achieve heat-shielding without compromising overall adhesion, as the silane-modified portions provide localized bonding functionality
Solution Approach 2:
The silane-modified PVB acts as an intermediary substance between the heat-absorbing nanoparticles and the glass surface, maintaining adhesion while allowing the nanoparticles to provide heat-shielding functionality without direct contact that would harm adhesion
3Reliability
If PVB films are made rough to remove air during lamination, then adhesion is improved, but thin PET films applied thereto become optically uneven
Solution Approach 1:
The patent modifies the surface parameters of the PVB film by controlling the roughness degree and incorporating optical leveling agents to maintain both adhesion benefits and optical uniformity, preventing the optical unevenness that would affect subsequent PET film application
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 provides laminated glass with improved penetration resistance and heat-shielding properties, maintaining necessary safety and thickness requirements while reducing the number of film layers and minimizing adhesion issues, resulting in enhanced solar transmittance and light transmission ratios.
Implementation Method 1
these films can be directly molten on one of the glass surfaces with the typical production methods for laminated glass laminates
Implementation Method 2
thin PET films coated in an IR-absorbing or IR-reflecting manner are embedded between a plurality of layers of plasticiser-containing polyvinyl acetal
Data Source
AI summary
Laminated glass contains two glass sheets interlayered with at least one polymer film C which is provided with a coating A comprising a polyvinyl acetal PA and optionally at least one plasticiser WA, and at least one film B containing a polyvinyl acetal PB and at least one plasticiser WB wherein coating A comprises less than 16% by weight of plasticiser, film B comprises at least 16% by weight of plasticiser, and film C comprises polyamide, polyethylene terephthalate, polybutylene terephthalate, polyvinyl alcohol, polylactic acid, polyethylen furanoate cellulose acetate, polymethyl methacrylates, polyethylene naphthalate, ionomers, or combinations thereof, wherein film C is located between coating A and film B.