Molecular structure and mechanism of action of silane coupling agent

Silane coupling agent is a kind of low molecular organosilicon compound with special structure, and its general formula is RSiX3, type R has affinity with polymer molecules or ability to respond to the activity of functional groups, such as oxygen radicals, sulphur, vinyl, epoxy group, propyl amide, ammonia, etc; X represents the alkoxy to hydrolysis, such as halogen, alkoxy, acyl oxygen radicals, etc.
In the coupling, the first X base water forming silanol, then react with inorganic powder particles on the surface of the hydroxyl, formation of hydrogen bonds and condensed into - SiO - M covalent bond (M says inorganic powder particle surface). At the same time, silane molecules silanol and mutual association in forming the reticular structure of the membrane covering the surface of powder particle, the organic inorganic powder surface.

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The basic introduction of silane coupling agent

Silane coupling agent, also known as silane treatment agent, primer, is a kind of low molecular organosilicon compound with special structure, and its general formula is RSiX3, type R has affinity with polymer molecules or ability to respond to the activity of functional groups, such as oxygen radicals, sulphur, vinyl, epoxy group, propyl amide, ammonia, etc; X represents the alkoxy witch can hydrolysis, such as halogen, alkoxy, acyl oxygen radicals, etc.
The silane coupling agent is a kind of organic silicon monomer with two or more different reactions in the molecule, which can be chemically bonded with organic and inorganic materials(coupling), increase the adhesion of two kinds of material. In the general formula n is 0 ~ 3 integers; X represents a hydrolyzable  functional group, it can be with methoxy, ethoxy, cellosolve and inorganic materials (glass, metal, SiO2) coupling reaction; Y for organic functional groups, such as vinyl, ethoxy, amino, epoxy group, methyl acryloyl oxygen, thiol groups, etc. with inorganic materials, all kinds of synthetic resin, rubber coupling reaction. The typical performance of silane coupling agent in the following table: used in glass fiber, inorganic filler surface treatment.Used for sealants, adhesives and coatings thickener. Also used in the immobilized enzyme attached to the surface of glass substrate, oil well drilling sand, make the brick with a hydrophobic surface, make the surface of the fluorescent coating has high resistance, improve the liquid chromatography in organic glass surface absorption capability, etc. By silicon chloroform and olefin with reactive groupreactive group bonus then through alcoholysis under catalytic system under the platinum catalyst.

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The Viscosifying Ability Of Silane Coupling Agent

Silane coupling agent can improve the bonding strength, water resistance,  weather resistance, etc. Silane coupling agent can solve the problem of long time can not be bonded. Silane coupling agent as tackifier effect principle is that it itself has two groups: A group can be sticky and skeleton materials; While another group can be combined with polymer materials or bonding agent, thus in higher bonding interface formed strong chemical bonds, greatly improve the bonding strength.Silane coupling agent application in general there are three ways: one is as skeleton material surface treatment agent; two is added to the binder, three is directly added to the polymer materials. From the full play to its efficiency and reduce the cost of the point of view, the first two methods are better.

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