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Hexamethylphosphoramide, also known as hexaphosphamide and hexamethylphosphamide, is prepared by the reaction of dimethylamine and phosphorus oxychloride. Molecular weight 179.2. It is a colorless or light yellow transparent liquid. Slightly fishy. The relative density is 1.0253~1.0257 (20 °C), the refractive index is 1.4582~1.4589 (20 °C), the freezing point is 2~7 °C, and the boiling point is 116~117 °C (1480Pa). Soluble in polar and non-polar solvents. It can be miscible with commonly used plasticizers such as dioctyl phthalate, dioctyl sebacate, and triphenyl phosphite in any proportion. Toxicity is similar to phosphate esters. Avoid contact with skin. The container should be firmly sealed to prevent leakage and water absorption. Hexamethylphosphoramide is a light stabilizer of polyvinyl chloride, so that the product has excellent outdoor anti-aging performance and excellent weather resistance, so it is known as a high-efficiency weathering agent of polyvinyl chloride. Adding 2~5 parts of this product to the polyvinyl chloride film can not only significantly improve its weather resistance and cold resistance, but also reduce the processing temperature by 10 °C. This product can also be used as an excellent polar solvent for polyphenylene sulfide, polyurethane, polyamide and other polymer materials, improve resin quality, simplify the process and reduce costs. When added to EPDM rubber, it can improve elasticity and oil resistance. It can also be used as a co-catalyst for propylene bulk polymerization to improve the catalytic efficiency of the main catalyst.
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