| abstract |
The invention discloses a preparation method of a small-molecule phosphorus-magnesium flame retardant. The inorganic phosphoric acid is dissolved in anhydrous ethanol, magnesium hydroxide is added, the reaction is stirred at 60-80° C. for 5-6 hours, filtered, washed and dried, The obtained white solid powder is a small molecular phosphorus-magnesium flame retardant; the inorganic phosphoric acid is one of phosphoric acid, phosphorous acid and hypophosphorous acid. Small molecular phosphorus-magnesium flame retardant was used to prepare phosphorus-magnesium halogen-free and low-smoke intrinsic flame retardant copolyester material HAMH-PET. HAMH‑PET has excellent flame retardancy, smoke suppression, drip resistance and mechanical properties, which are attributed to the good compatibility between HAMH and PET matrix and the synergy of phosphorus and magnesium to form a dense spherical structure during the combustion process. |