利用三聚氰胺和甲醛的羟甲基化反应得到液态多羟甲基三聚氰胺，并借助共起始剂引发其与环氧氯丙烷的阴离子开环聚合，得到三聚氰胺基结构阻燃聚醚多元醇(MNFRP).FT-IR 和1 H NMR 结果均证实 MNFRP 分子链段中含有三聚氰胺的特征三嗪环结构.进而将其作为基础树脂，制备出三聚氰胺基本征阻燃 PU 硬泡材料.SEM 观察结果表明该泡沫具有致密的多边形泡孔结构.不使用阻燃剂其氧指数高达24．2％，较普通聚醚4110基 PU 硬泡(18．1％)有较大提高.
In this paper,the hydroxymethylation reaction of melamine and formaldehyde was employed to syn-thesize liquid multi-methylolate melamine.At the presence of coinitiator,it was used to react with epoxy chlo-ropropane (ECH)through anionic ring-opening polymerization method,and thus get melamine-based structural flame retardant polyether polyol (MNFRP).Both of FT-IR and 1 H NMR spectra proved the presence of the characteristic peak for melamine triazine ring structure in MNFRP polyol.In order to study the flame retardant performance of MNFRP,melamine-based flame retardant polyurethane (PU)rigid foam was further prepared by using MNFRP as base resin.Scanning electron microscopy analysis (SEM)observations showed that the PU foam have uniform and dense polygon-like cell structure.Even without the use of flame retardant,its limiting oxygen index (LOI)can be reach to 24.2%,which was higher by 33.7% than that of traditional PU rigid foam (18.1%)fabricated by 41 10-based polyether.
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