4,4,15,15-Tetraethoxy-3,16-dioxa-8,9,10,11-tetrathia-4,15-disilaoctadecane

UsesBis[3-(triethoxysilyl)propyl]tetrasulfide is a silylating coupling agent and modifier, and has been used in the design of a new generation of sustainable self-healing styrene-butadiene compounds.

UsesBis[3-(triethoxysilyl)propyl]tetrasulfide is used in radial tires, rubber tire treads, carcass, tire walls, solid rubber tires and other rubber products. It acts as a chemical intermediate and as a cross linking agent. Furthermore, it acts as a coupling agent used to chemically modify silica surface. In addition, it serves as a curing agent for good heat aging.

UsesBis[3-(triethoxysilyl)propyl] tetrasulfide (TESPTS) is generally used as a crosslinking agent and reinforcing filler in the manufacturing of rubber. TESPT film provides corrosion protection to the metallic substrates. It is also used as a precursor in the synthesis of mesoporous organosilicas.

PreparationThe synthesis of bis-[3-(triethoxysilyl)propyl]-tetrasulfide is mainly based on the catalytic reaction of trichlorosilane and allyl chloride. Using trichlorosilane and allyl chloride as raw materials, γ-chloropropyltrichlorosilane is synthesized via a catalytic reaction. This step is crucial to the synthesis process, requiring precise control of reaction conditions and catalyst selection to ensure product purity and yield. The obtained γ-chloropropyltrichlorosilane undergoes alcoholysis to generate γ-chloropropyltriethoxysilane. The alcoholysis reaction is typically carried out in anhydrous ethanol, with heating and stirring promoting the reaction. Finally, γ-chloropropyltriethoxysilane is reacted with a sulfide under specific conditions to generate bis-[3-(triethoxysilyl)propyl]-tetrasulfide. This step requires strict control of reaction temperature and time to ensure product quality and yield.