The invention discloses a
flame-retardant
polyol containing
phosphorus linked pendant groups and a preparation method of the
polyol. The method specifically comprises steps as follows: 1) a
solvent and
neopentyl glycol are arranged in a reaction kettle,
phosphorus oxychloride is dropwise added, and an intermediate, namely,
neopentyl glycol phosphorus oxychloride, is prepared; 2) a
solvent and micro-molecular trihydric
alcohol or tetrahydric
alcohol are arranged in the reaction kettle, an acid-binding agent is added, the intermediate dissolved in the
solvent is dropwise added, a
reflux reaction is performed, and the
flame-retardant
polyol containing the phosphorus linked pendant groups is obtained through cooling,
filtration and washing. The
flame-retardant polyol containing the phosphorus linked pendant groups contains no
halogen and is environment-friendly and non-toxic, raw materials are cheap and easy to obtain, the technology is simple and controllable, two or three contained activated terminal hydroxyl groups can react with
isocyanate, an intrinsically flame-retardant
polyurethane material containing the phosphorus linked pendant groups can be prepared, so that defects that additional flame retardants are poor in compatibility in water-based
polyurethane systems, migrate and separate out easily and the like are overcome, and the problem of reduction of physical and chemical properties of the material due to breakage of the
polyurethane main
chain structure due to the fact that
phosphate ester bonds of traditional polyols containing phosphorus linked main chains are not resistant to
hydrolysis is also solved.