Dimethyldimethoxysilane
Dimethyldimethoxysilane

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CAS #

1112-39-6

Chemical nameDimethyldimethoxysilane
Brand numberMM-22
Product NameTwo Jia, two Jia
Quality indicatorsPurity≥ 99.50%, methanol≤ 0.5%, chloride ion≤ 30ppm
Packaging specification/kg20. 170
Molecular weight120.22
Boiling point81~82
Density0.870~0.875
Refractive index1.3680~1.3700
Appearance and riskColorless transparent liquid;Flammable liquid
Product applicationPreparation of silofunctional silane, polysiloxane, etc., used in white carbon black treatment agent.

 

 

Beyond polymer synthesis, its most direct application is as a surface modifying agent. When applied to a substrate—for instance, concrete, masonry, or natural stone—it readily penetrates the surface. Ambient moisture hydrolyzes the methoxy groups, forming reactive silanol (Si-OH) groups that subsequently condense with hydroxyl groups (-OH) present on the mineral surface. This creates a strong, covalent Si-O-substrate bond. The result is a thin, invisible, and durable monolayer that renders the surface hydrophobic. This is the fundamental chemistry behind many water-repellent sealers and weatherproofing agents, protecting structures from water ingress, freeze-thaw damage, and staining.
 
Furthermore, dimethyldimethoxysilane finds niche but crucial roles as a crosslinking agent in specialty coatings and adhesives, enhancing their durability and chemical resistance. It is also employed as a precursor in the sol-gel process for creating advanced ceramic and composite materials and even serves as a reagent in organic synthesis for introducing the dimethylsilyl group.
 

Classification:

Functional silane

Key words:

Dimethyldimethoxysilane

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