Laminated Glass Interlayer Film Adhesive Force Control
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Solution Overview
Problem
Laminated glass interlayer films face challenges in maintaining a proper adhesive force range while ensuring good moisture resistance, as existing adhesive force regulators can deteriorate moisture resistance and fail to adjust adhesive force effectively, especially in high-temperature and high-humidity environments.
Innovation Solution
Incorporating a carboxylic acid alkali metal salt or alkaline earth metal salt into the interlayer film, with specific concentration ratios and isolation rates to control the adhesive force and moisture resistance, using a thermoplastic resin, and optionally including a luminescent material to prevent coloring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesive force regulator (carboxylic acid metal salt) is blended in the interlayer film to adjust adhesive force within a proper range, then the adhesive force is improved, but the moisture resistance is deteriorated
Solution Approach 1:
The invention changes the chemical parameters by specifying precise molar concentration ranges for alkali/alkaline earth metals (0.35-1.00 mol/m³) and controlling carboxylic acid isolation rates (≤40%). This parameter optimization allows the adhesive force regulator to function effectively while minimizing moisture resistance deterioration, resolving the contradiction between adhesive force adjustment and moisture resistance maintenance
Solution Approach 2:
The invention uses a composite approach by combining thermoplastic resin with specific concentrations of carboxylic acid metal salts and controlled carboxylic acid isolation. This composite material strategy enables the interlayer film to achieve both proper adhesive force and good moisture resistance simultaneously, as the synergistic composition balances the competing requirements
2Reliability
If the blending amount of the adhesive force regulator is decreased to provide good moisture resistance, then the moisture resistance is improved, but the adhesive force cannot be adjusted within a proper range
Solution Approach 1:
The invention optimizes the parameter of metal salt concentration within a specific range (0.35-1.00 mol/m³) rather than simply decreasing it. This controlled parameter change ensures that moisture resistance is maintained while the adhesive force remains within the proper range, preventing the deterioration of either property
Data Source
AI summary
An interlayer film for laminated glass of the present invention comprises a thermoplastic resin, a carboxylic acid, and an alkali (alkaline earth) metal, wherein, when a molar concentration per unit volume of the alkali (alkaline earth) metal in the interlayer film for laminated glass, measured by ICP atomic emission spectrophotometry is A (mol/m3); a molar concentration per unit volume of the carboxylic acid in the interlayer film for laminated glass, measured by GC-MS is B (mol/m3); a molar concentration per unit volume of the carboxylic acid in the interlayer film for laminated glass, measured by GC-MS after a hydrochloric acid aqueous solution is added to the interlayer film for laminated glass to be left at 23° C. for 12 hours is Y; and a molar concentration per unit volume of the carboxylic acid, obtained by subtracting the molar concentration B from the concentration Y is D (mol/m3), the molar concentration A is more than 0.35 mol/m3 and less than 1.00 mol/m3, and a carboxylic acid isolation ratio (1) represented by (1−D/A)×100 is 40% or less.