| abstract |
Halogen-free reactive flame retardant for polyurethane foam and its preparation method and application, halogen-free reactive flame retardant, composed of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), prepared by the Mannich reaction of alcohol amine and formaldehyde, the structural formula is The halogen-free reactive flame retardant adopts Mannich reaction to introduce alcohol amine and formaldehyde into the DOPO flame retardant structure, which reduces the cost of the flame retardant. The synthesized halogen-free reactive flame retardant contains active hydroxyl groups and flame-retardant nitrogen and phosphorus. Elements, and contain primary or tertiary amines, high reactivity, rigid benzene ring is used in flame-retardant polyurethane foam, has high flame retardancy, and increases the strength and flame-retardant durability of the foam, and the oxygen index can reach 23 ~28%. It has broad application prospects in construction, heat preservation and some special occasions. |