Hidrofugantes penetrantes de alquilsilano y reticulantes para selladores — methyltrimethoxysilane, octyltriethoxysilane y silanos acetoxi/oxima — para concreto, mampostería y formulación de selladores.
Los hidrofugantes penetrantes de alquilalcoxisilano se absorben en el concreto, el ladrillo y la piedra, luego se hidrolizan y se enlazan a la superficie mineral para recubrir las paredes de los poros con una capa hidrofóbica que reduce la absorción capilar de agua. Methyltrimethoxysilane (CAS 1185-55-3) is the workhorse small-molecule silane for this; its low molecular weight drives deep penetration into dense substrates. Specify a monomeric alkyl silane where penetration depth matters more than a surface film, such as vertical concrete facades and bridge decks.
Cure chemistry sets the handling envelope. Methoxysilanes such as methyltrimethoxysilane react and condense quickly but release methanol as the byproduct; the ethoxy analog, methyltriethoxysilane, cures more slowly and releases ethanol instead. Octyltriethoxysilane carries a longer C8 alkyl chain for higher water repellency on porous masonry. The trade-off is real: these silanes need a dry-enough substrate and adequate cure time before water exposure, so plan application around weather and substrate moisture instead of treating them as instant-dry.
A second group in this family is built for sealants instead of substrate treatment. Acetoxysilanes (ethyltriacetoxysilane, methyltriacetoxysilane) act as moisture-cure crosslinkers in RTV silicone sealants and release acetic acid on cure, while methyltris(methylethylketoxime)silane is an oxime crosslinker for lower-corrosivity systems on sensitive substrates. (3-Chloropropyl)trimethoxysilane is a chloroalkyl coupling silane for specialty surface modification. Match the crosslinker to the substrate: choose oxime or alkoxy chemistries where acetic-acid corrosion of metal or concrete is a concern.
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