Preparation and application examples of tetraisopropyl methylene diphosphate_Industrial additives

Background and overview^[1]

Tetraisopropyl methylene diphosphate is an organic intermediate that can be prepared from diisopropyl phosphite and carbon disulfide through a one-step reaction. There are reports in the literature that methylene diphosphate tetraisopropyl diphosphate can be used to prepare highly flame-retardant cable sheathing tubes.

Preparation^[1]

Diisopropyl phosphite (4 mL, 24 mmol) was added dropwise to a suspension of NaH (28.8 mmol, 1.2 equiv) in dry THF (25 mL) at -5 °C to 0 °C under nitrogen. Then, the mixture was stirred at 20 °C for 3 h, and carbon disulfide (9.6 mmol, 0.4 equiv) was added dropwise. The color of the reaction mixture changed to brown. Stirring was continued for 3 hours, then the mixture was poured into saturated solution of NH4Cl and extracted with Et2O. The combined organic layers were dried (MgSO4), the solvent was removed under reduced pressure, and the product was purified by vacuum distillation (110-115°C, at 3.10-2 mbar) to obtain the compound methylene diphosphate tetraisopropyl ester as a light yellow oil Things (52%).

Apply^[2]

CN201610387521.6 discloses a highly flame-retardant cable sheath tube, which is composed of the following raw materials in parts by weight; acrylonitrile-ethylene-styrene copolymer, methyl methacrylate-acrylonitrile-styrene copolymer, polyethylene Vinyl chloride, hydrolyzed chicken feather powder, methylvinyldichlorosilane, 3-(2-aminoethylamine)propyltriethoxysilane, tetraisopropyl methylene diphosphate, sodium pentane sulfonate, stearin Myristyl acid ester, polyvinyl acetate, 4,4′-diaminodiphenyl ether, magnesium hydrogen phosphate trihydrate, nano titanium dioxide, nano oxygen carbon blackened aluminum, gum arabic, white carbon black. The sheathing pipe of the present invention has the advantage of excellent high flame retardant performance, and at the same time, it also has good tensile resistance effect.