Research progress of flame retardant application of ammonium poly-phosphate
Ammonium polyphosphate(APP)is widely used in polypropylene,polyurethane,epoxy and other polymers in the field of flame retardant because of its non-toxic,halogen free,smoke suppression,flame retardant effect and environmental friendliness.However,strong moisture absorption,high addition amount,poor dispersibility and limited compatibility with polymers are the drawbacks that hinder the further development of APP.In view of the above problems,the flame retardant mechanism and application of ammonium polyphosphate was systematically reviewed,and the relevant solutions were sum-marized.Firstly,The physical and chemical properties and flame retardant mechanism of APP were briefly introduces.Sec-ondly,the research progress of APP flame retardants at home and abroad in recent years was reviewed,and the flame retar-dancy effects of different flame retardants such as single flame retardancy,com-pound flame retardancy,microencapsulated coating,chemical modification and nano compound flame retardancy were introduced in detail,and the advantages and dis-advantages of different flame retardancy methods were summarized.Finally,the APP exist problems in the research of poly-mer flame retardant were discussed,and its development direction in the future was prospected.
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