2-丙烯酰胺基-2-甲基丙磺酸接枝改性瓜尔胶的制备与性能研究

为改善瓜尔胶与其他组分的相容性及耐盐性,以可生物降解的瓜尔胶为原料,过硫酸钾和亚硫酸钠为氧化还原引发体系,将2-丙烯酰胺基-2-甲基丙磺酸(AMPS)接枝到瓜尔胶分子上。研究AMPS用量、引发剂用量、引发剂滴加时间、反应时间、反应温度、分散剂与瓜尔胶的质量比(浴比)、分散剂中乙醇质量分数等因素对接枝反应的影响,确定较佳反应条件。制得的磺酸基瓜尔胶衍生物胶液稳定,黏度较高,在质量分数为2%的KCl盐水溶液中黏度下降很小,具有良好的耐盐性。将其按一定比例与牙膏成分进行混合,其与牙膏组分的相容性好,膏体稳定且改善了脱尾现象,满足作为水性膏体黏结剂的要求。

Study on the preparation and the properties of modification guar gum grafting 2-acrylamide-2-methyl propane sulfonic acid

To improve the compatibility of guar with other components and salt tolerance, 2-acrylamide-2-methyl propane sulfonic acid (AMPS) is grafted onto macromolecular structure of guar gum by using biodegradable guar gum as raw material and potassium persulfate (K₂S₂O₈) and sodium sulfite(Na₂SO₃) as redox initiation system. The influence of AMPS content, initiators content, initiators feeding time, reaction time, reaction temperature, liquor radio, ethanol percentage of dispersant on grafting efficiency is investigated to get better reaction conditions. The sulfonic guar gum derivatives glue is stable and high viscous, and the glue has good salt tolerance, with viscosity decreased very slightly in 2% potassium chloride solution (KCl). Mixing with toothpaste ingredients at a certain proportion, the glue has a good compatibility with toothpaste components, and it improves the tail off phenomenon and meet the requirements as an aqueous binder.