Silane Primer for Adhesion on Wet Hydrophilic Surfaces
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Solution Overview
Problem
Existing solutions for improving the adhesion of bonding agents to hydrophilic substrates like glass and ceramic under moist conditions have limitations, including short shelf life and delayed bonding times, which hinder efficient industrial and domestic applications.
Innovation Solution
A solution comprising a combination of two silanes and alcohol in an aqueous-alcoholic mixture, specifically designed to enhance the reactivity and aging stability of the primer solution, allowing for immediate bonding and durable adhesion even after long storage times and high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If reactive silanes are used to achieve rapid hydrophobization and immediate bonding, then bonding speed is improved, but shelf life of the primer solution deteriorates to less than six months
Solution Approach 1:
The patent changes the chemical parameters of the silane compound by selecting specific functional groups (amino, epoxy, oxirane, aziridine, or isocyanate groups) and controlling the molecular structure to achieve optimal reactivity. This allows the primer to maintain high bonding speed while extending shelf life to over six months through careful molecular design and selection of silane derivatives with balanced reactivity and stability characteristics.
2Duration of action of stationary object
If moderately reactive silanes are used to achieve long shelf life of more than six months, then storage stability is improved, but bonding speed deteriorates requiring waiting times of hours
Solution Approach 1:
The patent applies the preliminary action principle by pre-hydrolyzing the silane compounds before application. The primer solution contains pre-reacted silane species that are ready to bond immediately upon contact with the substrate, eliminating the need for long waiting periods. This pre-preparation of reactive species allows the system to achieve both fast bonding and long shelf life by separating the hydrolysis step (done in advance) from the condensation step (done at application).
Solution Approach 2:
The patent uses composite silane formulations combining multiple silane derivatives with different functional groups and reactivity levels. This composite approach allows the primer to maintain stability during storage while providing rapid bonding capability when applied, as different silane components contribute different properties to the overall system performance.
3Ease of operation
If hydrophilic surfaces are left untreated, then application simplicity is maintained, but adhesion performance deteriorates under moist and wet conditions
Solution Approach 1:
The patent implements self-service by formulating the primer as a self-drying composition that automatically forms a hydrophobic protective layer upon application to the hydrophilic surface. The primer utilizes ambient moisture and air drying to complete the hydrolysis and condensation reactions, eliminating the need for additional processing steps, heating, or specialized equipment. This self-processing capability maintains application simplicity while ensuring reliable adhesion performance.
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 enables rapid and durable bonding on hydrophilic surfaces, with the ability to withstand tip-shear loads under heat-and-humidity conditions, significantly improving the storage life and usability of adhesive products like 'tesa Powerstrip' on damp substrates.
Implementation Method 1
Following the application of the silane to the hydrophilic surface, a covalent bond is formed between surface and silane
Implementation Method 2
glasses are coated with adhesion promoters which hydrophobize the surface and thereby eliminate the aforementioned layer of water
Implementation Method 3
in order to achieve covalent attachment of the silane both to the glass surface and to the adhesive in this way. After contact has been produced
Data Source
AI summary
The invention relates to a solution in particular for the pre-treatment of a surface, containing, preferably consisting of: I) at least one first silane of formula (I) with R1, R2, R3 independently selected from the groups methyl, ethyl, 2 methoxyethyl, propyl, i-propyl, butyl, benzyl, wherein m=0 or 1, n=3 to 12, p=1 or 2, and for p=1, Y=a functional group selected from the groups (meth)acryl, (meth)acryloxy, mercapto, ureido, —NH—CH2—CH2—NR4R5, —NR4R5 (with R4 and R5 independently selected from the groups H, alkyl, phenyl, benzyl, cycloalkyl), or for p=2, Y=NH; II) at least one second silane of formula (II) with R1, R2, R3 independently selected from the groups methyl, ethyl, 2 methoxyethyl, propyl, i-propyl, butyl, benzyl, wherein m=0 or 1, R8=H, alkyl, phenyl, benzyl or cycloalkyl; III) at least one alcohol; and IV) water.