Fire-protective glazing with bubble-initiating particles
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Solution Overview
Problem
Fire-resistant glazings with hydrated alkali silicate intumescent layers face challenges in maintaining optical clarity and preventing glass and intumescent layer projections during fire tests, as the absence of defects can lead to localized vapor accumulation and overpressure, reducing fire resistance.
Innovation Solution
Incorporating small, non-porous, and evenly distributed bubble-initiating particles compatible with the alkali silicate, such as silica, at the intumescent layer interfaces or within the material to promote multiple bubble formation, thereby distributing pressure evenly and preventing projections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the intumescent layer is free from defects and has homogeneous composition, then optical qualities are maintained throughout the life of the glazing, but during fire tests localized vapor accumulation occurs leading to overpressure and projection of glass and intumescent layer pieces
Solution Approach 1:
The invention introduces a porous or heterogeneous structure into the intumescent layer by incorporating particles with different thermal expansion coefficients. These particles create controlled voids and pathways that allow vapor to escape gradually during fire exposure, preventing localized overpressure and subsequent projections of glass and intumescent layer pieces.
Solution Approach 2:
The invention creates local heterogeneity within the intumescent layer by distributing particles non-uniformly or at specific locations. This local quality variation ensures that vapor generation is distributed across multiple sites rather than concentrated at single points, thereby preventing overpressure buildup while maintaining overall structural integrity and optical quality.
2Reliability
If particles are introduced to promote multiple bubble formation, then projections are prevented, but optical qualities may be altered due to light scattering
Solution Approach 1:
The invention applies local quality by concentrating particles at specific locations such as interfaces between the intumescent layer and glass sheets, or at the edges of the glazing assembly. This localized placement allows particles to perform their fire-resistant function while remaining hidden from direct viewing angles, thus maintaining optical transparency.
Solution Approach 2:
The invention utilizes particles with optical properties matched to the surrounding materials, making them visually imperceptible under normal lighting conditions. The particles may have refractive indices similar to the glass or intumescent layer, or be positioned such that they do not scatter light in visible directions, thereby preserving illumination intensity and optical quality.
Data Source
AI summary
The invention relates to "fireproof" glass comprising at least one intumescent layer consisting of a hydrated alkaline silicate arranged between the glass sheets. In order to favour an expansion of the intumescent material well distributed during fire tests, bubble initiation elements are incorporated in the intumescent material or on the surface of the latter.