Fireproof Glazing Intumescent Layer Drying Process
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Solution Overview
Problem
The production of fire-resistant glazing with intumescent materials based on hydrated alkali silicates faces challenges such as lengthy drying times, uneven thickness, and reduced fireproof performance due to water content gradients and viscosity issues, leading to defects like bubbles and cracks, and increased weight and bulkiness when trying to achieve desired thicknesses.
Innovation Solution
The method involves applying and drying the silicate solution in successive layers, with each layer dried to the desired water content before adding the next, using compositions with varying molar ratios and incorporating synthetic or modified silicates to limit water transfer and achieve homogeneity, thereby reducing drying time and improving fire resistance and optical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the drying process is carried out gradually to avoid defects, then the quality of the intumescent material is improved, but the drying time increases significantly
Solution Approach 1:
The drying process is divided into multiple sequential stages, each drying a specific layer of the intumescent material. This segmentation allows each layer to be dried independently and quickly, avoiding the need to wait for the entire thick layer to dry gradually, thus reducing total drying time while maintaining quality.
Solution Approach 2:
The intumescent material is applied in thin preliminary layers that are dried completely before adding the next layer. This preliminary drying of each layer prevents defects like bubbles and cracks while significantly reducing the total drying time compared to drying a single thick layer gradually.
2Loss of time
If thin layers of solution are dried to reduce drying time, then the drying time is reduced, but the thickness of the intumescent material is limited
Solution Approach 1:
The desired thick intumescent layer is constructed by stacking multiple thin dried layers on top of each other. Each thin layer is dried quickly, but collectively they achieve the required total thickness, thus reducing drying time while maintaining adequate material thickness for fire resistance.
Solution Approach 2:
Instead of drying one thick layer, the process transitions to building thickness in the vertical dimension by stacking multiple thin layers. This dimensional approach allows rapid drying of each layer while accumulating the necessary total thickness through the stack.
3Reliability
If high molar ratio of SiO2/M2O is used to improve fire-resistant properties, then the fire resistance is improved, but the solubility of silicate in water decreases and drying time increases
Solution Approach 1:
The intumescent material with high SiO2/M2O molar ratio is applied in thin segmented layers that are dried quickly. This segmentation allows the use of less soluble high-ratio silicates without increasing total drying time, as each thin layer dries rapidly before the next is applied.
Solution Approach 2:
The composition parameters of the silicate solution are optimized by adjusting the molar ratio of SiO2/M2O to achieve the desired fire resistance. The high-ratio silicate is used in controlled thin layers, changing the application parameters to maintain fast drying while achieving the required fireproof properties.
4Duration of action of stationary object
If thick intumescent material is used to improve insulation time, then the fire insulation time is improved, but the weight and bulkiness of the glazing increase
Solution Approach 1:
The thick intumescent layer is constructed from multiple thin segmented layers that are dried independently. This segmentation achieves the required total thickness for adequate fire insulation time while using less material weight than a single solid thick layer would require, reducing overall glazing weight.
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
This approach results in more homogeneous intumescent materials with improved fire resistance, reduced drying time, and enhanced aging resistance, while minimizing defects and maintaining fireproof properties, achieving a final product with better water content uniformity and reduced weight.
Implementation Method 1
The drying process is carried out in batches in chambers where the temperature and humidity are controlled. Drying must be performed very gradually to avoid the formation of various possible defects such as bubbles, surface irregularities, or cracks.
Implementation Method 2
The rebalancing of the water content throughout the layer is determined by the gradient of this content, which is established as a result of the drying process itself. However, this rebalancing is slower as the material becomes more viscous and ultimately more 'solid.'
Data Source
Figure 1~8
Figure 2
Figure 5a~5b
AI summary
The invention relates to a method for producing fire-resistant glazing comprising at least two sheets of glass between which an intumescent material made of hydrated alkaline silicate is arranged, and in which a plurality of layers of alkaline silicate solutions are applied consecutively, the first layer being directly on one of the sheets of glass, said layer being dried, at least one second layer being applied to the first, said second layer also being dried, the process being repeated as many times as necessary in order to reach the sought final thickness, the composition of the consecutive layers being selected so as to limit the migration of water from one layer to the previously dried layer.