Vinyl Silane Moisture Scavenger

Silanil 258 silanil 289 silanil 919 and silanil 176 are popular to be used for post addition.

Vinyl silane moisture scavenger.

Silquest a 171 silane may also be useful as a moisture scavenger in moisture cure systems where enhanced shelf life is sought. Additive to moisture cure silane modified polyurethanes as a water scavenger to prevent premature cure used in microparticle surface modification einecs number. Methanol is formed as a by product and vinyl silane is cross linked in the formulation to an inert material. The presence of vinyl attached to the silicon increases the reaction rate of methoxysilane with water effectively eliminating water.

Vinyltrimethoxysilane is the most common moisture scavenger due to the electron interactions of the vinyl groupit reacts with moisture faster than other alkoxy silanes enabling it to function as a moisture scavenger in the presence of. Due to the electron interactions of the vinyl group the si methoxy groups in this silane hydrolyze substantially faster than in saturated aliphatic alkylalkoxysilanes. Key features and benefits feature benefit vinyl functionality vinyl functionality allows free radical addition to polymers. Increases the rate of silane hydrolysis.

These silanol groups react with the filler via silicon oxygen bridges. In the presence of moisture the ethoxy groups of dynasylan 6498 hydrolyse to produce ethanol and reactive silanol groups. Trimethoxy silane functionality. A major field of application for mineral filled compounds is the cable industry.

Because of the rapid hydrolysis of the vinyltrimethoxy silane in the acidic water it can be used as moisture scavenger in the polyurethane coatings where the hydrolysis products are 3 moles of methanol and one mole of vinyl silanol scheme 1. Storage stability water scavenger silanes used as drying agents can capture any latent moisture present in the immediate environment. Dynasylan 6490 dynasylan 6490 by evonik is a vinyl silane concentrate. The effective silane dosage is varied up to type of polymers it is recommended at 0 2 2 wt of silane based on resin solid content.

Sisib pc6110 vinyltrimethoxysilane is the most common moisture scavenger in adhesive and sealant formulations. Acts as an adhesion promoter. A very common moisture scavenger is vinyltrimethoxysilane.