Silane Solution pH Adjustment for Hydrophilic Surface Pretreatment
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Solution Overview
Problem
Adhesive bonds on hydrophilic surfaces such as glass and ceramic fail due to moisture interference, with existing adhesion promoters requiring lengthy waiting times and compromising storage stability, especially in consumer products where immediate use is not guaranteed.
Innovation Solution
A solution containing a silane with specific functional groups and an organic solvent, which adjusts the pH to deviate from neutral, allowing for rapid reaction and maintaining storage stability, is applied to hydrophilic surfaces to make them hydrophobic, thereby enhancing adhesive bonding under moist conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a reactive silane is used to hydrophobicize the surface quickly, then the waiting time for adhesive bonding is reduced, but the storage stability of the silane solution deteriorates
Solution Approach 1:
The patent applies parameter changes by adjusting the pH value of the silane solution to deviate by at least two pH units from neutral. This pH modification accelerates the reaction rate of the silane with the hydrophilic surface, reducing the waiting time for adhesive bonding to less than 20 hours, while the specific pH adjustment maintains adequate storage stability of the solution.
2Productivity
If the pH value of the silane solution is adjusted to accelerate reaction, then the waiting time is reduced, but the storage stability may be compromised
Solution Approach 1:
The patent optimizes the pH value parameter of the silane solution to achieve a balance between reaction rate and storage stability. By deviating the pH from neutral by at least two units, the reaction rate is significantly increased for faster bonding, while the specific pH range selected maintains adequate long-term storage stability of the solution.
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 significantly reduces the waiting time for adhesive bonding to less than 20 hours while maintaining storage stability, ensuring effective bonding performance even in humid conditions.
Implementation Method 1
The task is solved by using a solution as set out in main claim 1, in which, in addition to the pH value of the adhesion promoter solution deviating by at least two pH units from the neutral range
Implementation Method 2
The reaction of the silanes with the glass surface takes place in two steps. On the one hand, the silanes must be hydrolyzed, that is, the alcoholic groups RO are split off and replaced by hydroxy groups.
Implementation Method 3
After applying the silane to the hydrophilic surface, a covalent bond is formed between the surface and the silane. When the surface has been completely silanized, the water film described above is removed and can no longer be formed
Implementation Method 4
Adhesion promoters are applied to glasses before bonding, which make the surface hydrophobic and thus eliminate the aforementioned water layer
Implementation Method 5
More preferably, the boiling point of the solvent or mixture is between 25 and 120 ° C in order to enable evaporation as quickly as possible after the solution has been applied to the surface.
Data Source
AI summary
The invention relates to a solution intended more particularly for pretreating a hydrophilic surface to impart water repellency, comprising a silane of the formula (1) where R1, R2 and R3 independently of one another are selected from the group consisting of methyl, ethyl, 2-methoxyethyl and isopropyl, m = 0 or 1, n = 0 to 12, p = 1 or 2, and, for p = 1, Y = a functional group selected from the group consisting of alkyl, vinyl, phenyl, cyclobutyl, cyclopentyl, cyclohexyl, glycidyl, glycidyloxy, isocyanato, ureido, -CF3, -(CF2)qCF3 where q = 1 to 12, cyanide, halide, (meth)acryloyl, (meth)acryloyloxy, -NH-CH2-CH2-NR4R5 and -NR4R5 (where R4 and R5 independently of one another are selected from the group consisting of H, alkyl, phenyl, benzyl, cyclopentyl and cyclohexyl), or, for p = 2, Y = O, S, NH, and also comprising a component whose effect is that the pH range of the one hydrophilic surface deviates from the neutral range by at least two units.