Tetrapropoxysilane CAS NO: 682-01-9 QM-Si22

In the composite materials industry, tetra-n-propoxysilane is a highly efficient coupling agent. Inorganic fillers (such as glass fiber, silica, and talc) typically contain a large number of hydroxyl groups on their surface, exhibiting hydrophilicity, while organic resins (such as epoxy resin, polyester resin, and silicone rubber) are typically hydrophobic, resulting in poor compatibility between the two. When tetra-n-propoxysilane is used to treat the surface of inorganic fillers, the alkoxy groups of the silane molecules react with the hydroxyl groups on the filler surface to form chemical bonds; meanwhile, the propoxy group at the other end can bind with resin molecules during subsequent hydrolysis and condensation. Thus, it acts as a bridge, tightly connecting inorganic and organic materials, thereby significantly improving the tensile strength, flexural strength, and water and moisture resistance of the composite material.

Tetra-n-propoxysilane can also be used as a crosslinking agent for polymer materials, introducing a silicon-oxygen bond structure. In the production of room temperature vulcanized (RTV) silicone rubber, it can serve as a novel crosslinking agent component. Compared to traditional crosslinking agents, it can react with the active groups in silicone rubber to form a denser network structure, thereby improving the crosslinking density and heat stability of the vulcanized rubber. Furthermore, in the coatings and adhesives industry, it is used to modify acrylate and polyurethane systems, imparting excellent weather resistance, stain resistance, and scrub resistance to the coating, thus extending its service life.

In the field of high-tech materials, tetra-n-propoxysilane is one of the important precursors for preparing silica aerogels. Through the sol-gel method, utilizing its nanoporous network structure formed by hydrolysis and condensation, aerogel insulation materials with extremely low density and high porosity can be manufactured for high-efficiency thermal insulation in aerospace, new energy vehicles, and other fields. In the precision casting industry, it can be used as a binder in investment casting. Utilizing its high-strength silicon-oxygen bond network formed by hydrolysis and condensation, it can ensure that the cast shell maintains dimensional stability and strength during high-temperature calcination, thereby obtaining high-precision metal castings.

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