制备羧甲基玉米粉地膜材料的试验研究

Experimental study of the film material preparation by carboxymethylation corn powder

以玉米粉为原料通过羧甲基化反应制取羧甲基玉米粉。研究了乙醇体积分数、氢氧化钠质量分数、反应温度和反应时间等因素对羧甲基玉米粉黏度的影响 ,通过正交试验确定了最佳反应条件 :投料质量比 ,玉米粉∶氢氧化钠∶一氯乙酸为 8 1∶3 5∶4 8,反应温度 5 0℃ ,反应时间 4h。在 2 5℃时 ,产物水溶液 (质量比为 2 5 % )黏度达65 0mPa·s。

Carboxymethyl corn powder has been prepared from corn powder by carboxymethylation. The effects on viscosity of production of ethanol concentration, sodium hydroxide concentration, reaction time and reaction temperature were studied. The optimum reaction condition was that the ratio of the raw materials, corn powder, sodium hydroxide, chloroacetic acid=8.1∶3.5∶4.8, the temperature was 50?℃, the time was 4?h. The viscosity of production reaches 650?mPa·s in 2.5% water solution at 25?℃.