Cetyltrimethoxysilane is a long-chain alkyl trialkoxysilane coupling agent. The introduction of long-chain alkyl modification groups into silicone molecules can endow silicone products with new properties. Long-chain alkyltrialkoxysilane coupling agents can be used as waterproof additives for coatings, hydrophobic agents for durable and anti-fouling construction, additives for daily chemical products, mold release agents for plastic and rubber products, and post-treatment agents for fabrics (making fabrics smooth and giving a strong woolen feel), etc.