The preparation method of two [propyltriethoxysilane] disulfide
A technology of propyltriethoxysilane and chloropropyltriethoxysilane is applied in the production field of bis[propyltriethoxysilane] disulfide, and can solve the problem of increasing the output of three wastes of raw materials, toxic and harmful Substances, by-products are difficult to handle, etc., to achieve the effect of reducing the risk of polymerization, reducing the generation of three wastes, and reducing the input of raw materials
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[0050]Into a 1000mL three-necked flask equipped with a stirring and heating device, put 60g of sodium hydrosulfide aqueous solution with a mass fraction of 46%, 38g of an aqueous sodium hydroxide solution with a mass fraction of 48%, and 20g of sulfur powder, and heat up to 70°C. ℃-80 ℃ to react until there is no solid, keep warm for half an hour. 10g of tetrabutylammonium bromide was dissolved in 120g of n-heptane, and then added to aqueous sodium polysulfide solution. Raise the temperature of the above mixed solution to 75°C, start dropwise adding 230g of 98% chloropropyltriethoxysilane to reflux reaction, keep the temperature at 75°C-95°C, and keep warm for half an hour after the addition. Separating the water phase of the lower floor, transferring the upper organic phase to the short-range molecular distillation device, collecting fractions in sections, reclaiming the solvent n-heptane, obtaining the product 193g of the light yellow transparent liquid as the substrate, aft...
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