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Method Of Using Silane Coupling Agent
Feb 02, 2018

Surface pretreatment method

The silane coupling agent dubbed 0.5 ~ 1% concentration of the dilute solution, when used only need to be coated with a thin layer of clean surface, after drying glue. The solvent used is mostly water, alcohol (methoxysilane selected methanol, ethoxysilane selected ethanol), or water alcohol mixture, and non-fluoride ion-free water and inexpensive non-toxic ethanol, isopropanol is appropriate. In addition to the aminosilane, the solution prepared from other silane coupling agents need to be added acetic acid as a hydrolysis catalyst, and the pH adjusted to 3.5 to 5.5. Long-chain alkyl and phenyl silane due to poor stability, should not be used as an aqueous solution. Chlorosilane and ethoxy silane hydrolysis process accompanied by a serious condensation reaction, it is not suitable for use with aqueous solution or hydroalcoholic solution, and more with alcohol solution used. Poor water-soluble silane coupling agent, you can first join 0.1 ~ 0.2% (mass fraction) of non-ionic surfactant, and then add water processing into the water emulsion.


Migration method

The silane coupling agent is added directly to the adhesive component, generally added in an amount of 1 to 5% of the matrix resin. After gluing rely on the diffusion of molecules, the coupling agent molecules migrate to the bonding interface to produce conjugation. For the need to be cured adhesive, after the glue to be placed for some time before curing, so that the coupling agent to complete the migration process, in order to get better results.

In actual use, the coupling agent often forms a deposit on the surface, but only the monolayer actually functions, so the amount of coupling agent need not be excessive.

The main use of silane coupling agent surface pretreatment method and the direct addition method, the former is the treatment of the filler surface with a dilute coupling agent, which is premixed with the coupling resin when the resin and filler.

Silane coupling agent dubbed the solution is conducive to the silane coupling agent in the material surface dispersion, the solvent is water and alcohol formulated solution, the solution is generally silane (20%), alcohol (72%), water , Alcohol is generally ethanol (p-ethoxysilane) methanol (p-methoxysilane) and isopropanol (not easily soluble in ethanol, methanol silanes) due to silane hydrolysis rate and PH value, the slowest neutral, partial Acid, alkali are faster, so generally need to adjust the PH value of the solution, in addition to aminosilane, the other silanes can join a small amount of acetic acid, adjust the PH value to 4-5, aminosilane alkaline, do not have to adjust. Due to hydrolysis of silane, can not be long-lived, the best is now allocated with the best use within an hour.