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    • 3. 发明申请
    • MELAMINE POLYMETAPHOSPHATE AND PROCESS FOR ITS PRODUCTION
    • 聚甲基丙烯酸甲酯及其生产工艺
    • WO1997044377A1
    • 1997-11-27
    • PCT/JP1997001712
    • 1997-05-21
    • NISSAN CHEMICAL INDUSTRIES, LTD.SUZUKI, KeitaroSHISHIDO, KoujiSHINDO, Masuo
    • NISSAN CHEMICAL INDUSTRIES, LTD.
    • C08G79/02
    • C08K5/34928C08G79/02C08K5/529
    • A melamine polymetaphosphate having a solubility of from 0.01 to 0.10 g/100 ml in water at 25 DEG C, a pH of from 2.5 to 4.5 in the form of a 10 wt.% aqueous slurry at 25 DEG C and a melamine content of from 1.0 to 1.1 mol per mol of phosphorus atom. A process for producing such a melamine polymetaphosphate, which comprises the following steps (a) and (b): (a) a step of mixing melamine, urea and an aqueous orthophosphoric acid solution containing at least 40 wt.% of orthophosphoric acid, in such a ratio that melamine is from 1.0 to 1.5 mol per mol of orthophosphoric acid and urea is from 0.1 to 1.5 mol per mol of orthophosphoric acid, at a temperature of from 0 to 140 DEG C, to form a reaction mixture, and stirring the reaction mixture at a temperature of from 0 to 140 DEG C, while removing water, to obtain a powdery product of a double salt of orthophosphoric acid with melamine and urea; and (b) a step of calcining the powdery product obtained in step (a) at a temperature of from 240 to 340 DEG C for from 0.1 to 30 hours, while preventing agglomeration, to obtain a melamine polymetaphosphate.
    • 在25℃下在水中溶解度为0.01至0.10g / 100ml,pH为2.5至4.5,在25℃下为10重量%含水浆料形式的三聚氰胺聚偏磷酸钠,三聚氰胺含量为 每摩尔磷原子为1.0-1.1摩尔。 一种制备这种三聚氰胺聚偏磷酸盐的方法,其包括以下步骤(a)和(b):(a)将含有至少40重量%正磷酸的三聚氰胺,尿素和正磷酸水溶液混合在 三聚氰胺的摩尔比为每摩尔正磷酸为1.0〜1.5摩尔,尿素为0.1〜1.5摩尔/升正磷酸,温度为0〜140℃,形成反应混合物,搅拌 反应混合物在0-140℃的温度下,同时除去水,得到正磷酸的双重盐与三聚氰胺和尿素的粉末状产物; 和(b)在240〜340℃的温度下煅烧步骤(a)中得到的粉末状产物0.1〜30小时,同时防止团聚,得到三聚氰胺聚偏磷酸酯的工序。