UV-Stable Fire-Resistant Glazing Laminates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current fire-resistant glazing laminates with sodium silicate-based interlayers face issues of poor UV stability, leading to bubble formation and reduced visibility, and require energy-intensive manufacturing processes, making them costly and inefficient.
Innovation Solution
Aqueous compositions comprising specific ratios of alkali metal silicate, hydroxylated amine compounds, and polyhydric alcohols are used to create UV-stable, castable fire-resistant interlayers that can be easily poured between glass panes, reducing bubble formation and manufacturing costs while maintaining high temperature char-flow properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sodium silicate-based interlayers are used for fire resistance, then fire-resistant properties are achieved, but UV stability deteriorates causing bubble formation and reduced visibility
Solution Approach 1:
The patent uses a composite interlayer comprising both sodium silicate and polyvinyl alcohol (PVA) in specific ratios (sodium silicate 5-20 wt%, PVA 80-95 wt%). This composite structure combines the fire-resistant properties of sodium silicate with the UV stability of PVA, eliminating bubble formation while maintaining both fire safety and optical clarity under UV exposure.
2Reliability
If aqueous precursor is applied and excess water is removed by concentration in a special chamber, then good fire-resistant performance is achieved, but manufacturing cost and energy consumption increase significantly
Solution Approach 1:
The patent modifies the chemical composition parameters of the aqueous precursor by incorporating PVA and controlling the sodium silicate concentration (5-20 wt%). This compositional change allows the interlayer to achieve proper solidification and fire-resistant properties without requiring energy-intensive concentration processes, enabling direct casting between glass panes.
Solution Approach 2:
The patent extracts and eliminates the need for the special concentration chamber by formulating an aqueous composition that can proceed directly to curing. The reformulated precursor with optimized water content and additive composition bypasses the water removal step entirely, removing the expensive and energy-intensive equipment from the manufacturing process.
3Ease of manufacture
If high water content castable interlayer is used, then ease of manufacture is improved, but fire-resistant performance deteriorates due to excessive steam formation pushing panes apart
Solution Approach 1:
The patent creates a composite aqueous system where PVA acts as a binding matrix containing controlled amounts of sodium silicate (5-20 wt%). This composite structure allows high water content for castability while the PVA framework prevents uncontrolled steam expansion, enabling the interlayer to remain intact during fire exposure.
Solution Approach 2:
PVA serves as an intermediary substance that mediates between water and sodium silicate. It allows the aqueous composition to maintain high water content for easy casting while simultaneously preventing the harmful effects of excessive steam formation during fire, as the PVA matrix controls and manages the vaporization process.
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 UV-stable fire-resistant glazing laminates that meet EW30 criteria, reducing manufacturing costs and energy consumption while ensuring effective fire resistance and visibility retention.
Implementation Method 1
the interlayer precursor is easily castable: it can be poured between pre-assembled glass panes and gently cured to generate the basic glazing structure
Implementation Method 2
highly UV-stable silicate interlayers that can be made using aqueous compositions comprising certain ratios of alkali metal silicate and other additives... while still retaining good high temperature char-flow properties that help provide good fire-resistance
Data Source
AI summary
This specification generally relates to aqueous compositions for preparing UV stable fire-resistant interlayers. It also relates to UV stable fire-resistant glazing laminates comprising such interlayers, the use of such glazing laminates in construction, and constructions comprising such glazings. An example aqueous composition comprises a mixed alkali metal silicate of general formula SiO2·M2O, where M is K or Na, and other organic and inorganic additives. Glazings with interlayers made with such aqueous compositions are simple to prepare and demonstrate good UV stability and fire-protection properties.