Silane coupling agent
What is the silane coupling agent?
Organosilane coupling agent is a major component in pressure sensitive adhesive, adhesive and coating.
KANGLIBAMNG silicone pressures sensitive adhesive manufacturers support the development and preparation of silane coupling agent.
What is the silane coupling agent
Silane coupling agent is an important part of silicone pressure sensitive adhesive.
KANGLIBAMNG silicone coupling agent is customized.
RSiX3 special structure of low molecular organosilicone,R stands for amino group, sulfhydryl group, vinyl group, epoxy group, cyan group and methyl propanolol group and other groups, these groups and different matrix resin have strong reaction capacity,X stands for the group that can be hydrolyzed, such as halogen, alkoxy, acyl group.
Therefore, silane coupling agent can not only interact with hydroxyl in inorganic substances but also with long molecular chains in organic polymers, thus coupling two materials with different properties and improving the bonding effect of metal, plastic and silica gel.
Silane coupling agent structure
The general formula of the silane coupling agent is y-r-si-x3
Example: the hydrolyzable alkoxy group is usually epoxy or methods, and trihydroxy silane hydrolyzes faster than triethoxy silane under the same conditions of hydrolysis.
The rate of hydrolysis of methylacryloxy-methyl-triethoxysilane in acidic solution is 20 times that of -methylacryloxy-propyl-triethoxysilane.
Mechanism of action of silane coupling agent
The interfacial mechanism of silane coupling agent between two materials with different properties is characterised by chemical bond theory, reversible equilibrium theory and physical adsorption theory.
Because the interface phenomenon is very complex, it can not be considered as a single theory.
Examples: the theory of chemical bonding can explain the interaction between silane coupling agent and inorganic materials.
According to this theory, the coupling process of silane coupling agent at the interface of different materials is a complex physical and chemical process on the liquid-solid surface.
(1) the viscosity and surface tension of the silane coupling agent is low, the wetting ability is high, the glass, ceramics and metal surface of the contact Angle is small, can be quickly spread on the surface, so that the surface of inorganic materials by silane coupling agent wetting;
(2) once the silane coupling agent on the surface, the shop material surface by infiltration, silane coupling agent molecules on the surface of the two groups was similar to the polarity, due to the total adsorption material surface with thin layer in the atmosphere, the end of the alkoxy hydrolysis into silicon hydroxyl and orientation in the surface of inorganic materials, at the same time and the material surface hydroxyl hydrolytic polycondensation reaction;
The organic group is oriented on the surface of the organic material, and the chemical reaction between the two occurs during the cross-linking during, thus completing the coupling process between the heterogeneous materials.
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