Quaternary ammonium structure directing agent for silicate interlayers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current silicate interlayers used in fire-resistant glazings are brittle, difficult to handle, and lack flexibility, with varying structural homogeneity affecting their cohesion and water distribution, which complicates their manufacturing and performance.
Innovation Solution
The use of quaternary ammonium compounds with specific alkyl and hydroxy-substituted groups is introduced to control the structural homogeneity of alkali metal silicate solutions, directing and stabilizing the diversity and distribution of silicate structures, thereby enhancing the mechanical properties and thermal stability of the interlayers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a higher proportion of silica is used in the interlayer, then fire resistance is improved, but manufacturing difficulty increases and optical clarity becomes harder to achieve
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the silicate solution, specifically incorporating organic modifiers and controlling the SiO2:Na2O ratio within specific ranges (2.0:1 to 6.0:1) to achieve both high fire resistance and manufacturability. This resolves the contradiction by finding optimal parameter values that satisfy both fire resistance requirements and manufacturing feasibility.
Solution Approach 2:
The patent uses composite materials by combining inorganic silicate components with organic modifiers (such as polyhydric alcohols, carboxylic acids, or esters) to create a hybrid interlayer material. This composite approach enables the interlayer to achieve high silica content for fire resistance while the organic components improve processability and optical clarity, thus resolving the manufacturing difficulty contradiction.
2Reliability
If a higher proportion of silica is used in the interlayer, then fire resistance is improved, but optical clarity becomes harder to achieve
Solution Approach 1:
The patent controls the chemical composition parameters, specifically maintaining SiO2:Na2O ratios between 2.0:1 and 6.0:1 and adding specific amounts of organic modifiers (0.1-10% by weight), to achieve a balance where high silica content provides fire resistance while the controlled composition and organic additives prevent excessive crystallization and maintain optical clarity.
Solution Approach 2:
By creating a composite material system that combines inorganic silicate network formers with organic modifiers, the patent achieves a material that can maintain high silica content for fire resistance while the organic components act as network modifiers that prevent phase separation and crystallization, thereby maintaining optical clarity despite high silica proportions.
3Reliability
If conventional silicate interlayers are used, then fire resistance is provided, but mechanical flexibility and ease of handling are poor
Solution Approach 1:
The patent modifies the chemical parameters of the silicate system by adding organic modifiers and controlling the basicity (Na2O:SiO2 ratio) to create a more flexible network structure. This allows the interlayer to maintain fire resistance through adequate silica content while achieving improved mechanical flexibility and ease of handling through the modified composition.
Solution Approach 2:
The patent creates a composite interlayer material combining inorganic silicate base with organic flexibilizing agents (such as polyhydric alcohols or carboxylic acid esters). This composite structure provides the fire resistance of the silicate network while the organic components introduce flexibility and improve handling characteristics, resolving the contradiction between fire resistance and ease of operation.
4Ease of manufacture
If structural homogeneity is not controlled, then manufacturing is simpler, but cohesion and water distribution are poor
Solution Approach 1:
The patent employs self-service by incorporating structure-directing agents into the silicate solution formulation that automatically guide the self-assembly and condensation processes during drying and curing. These agents (such as specific organic modifiers) direct the formation of homogeneous silicate networks without requiring complex external control mechanisms, thus maintaining manufacturing simplicity while achieving excellent structural homogeneity, cohesion, and water distribution.
Solution Approach 2:
The patent controls the chemical parameters of the silicate solution, including pH, ionic strength, and organic modifier concentration, to optimize the self-assembly process. By adjusting these parameters within specific ranges, the system achieves spontaneous formation of homogeneous structures with good cohesion and water distribution, resolving the contradiction between manufacturing simplicity and compositional stability.
Data Source
Figure 1(a)
Figure 1(b)
Figure 2
AI summary
An additive for alkali metal silicate solutions, comprising a quaternary ammonium compound having the general formula (1) R1 R2 R3 R4 N+ OH-, wherein R1, R2, R3 and R4 which may be the same or different represent alkyl groups, hydroxy-substituted alkyl groups, alkaryl groups, hydroxy-substituted alkaryl groups comprising from 1 to 12 carbon atoms, or groups having the general formula -[CH2]n- N+ R5 R6 R7 wherein n is an integer having a value of from 1 to 12, the group - [CH2]n may be hydroxy-substituted, and R5, R6 and R7 which may be the same or different represent alkyl groups, hydroxy-substituted alkyl groups, alkaryl groups or hydroxy-substituted alkaryl groups comprising from 1 to 12 carbon atoms; with the proviso that at least one of the groups R1, R2, R3, R4, R5, R6 and R7 represents a hydroxy-substituted alkyl group or a hydroxy-substituted alkaryl group comprising at least 2 carbon atoms wherein the hydroxy substituent is not located on a carbon atom which is bonded to a nitrogen atom.