为了解决海藻酸钠逐步向食用品转化，价格提高，导致印花生产成本上升的问题，新型、低成本的改性糊料便成为了近年研究的热点。研究了低成本、印制性能较优的羧甲基淀粉的合成工艺。以蜡质玉米淀粉为原料，运用乙醇和异丙醇复配溶剂制得了能溶于水的高取代度羧甲基淀粉钠，考察了溶剂配比、碱化时间、碱化温度、醚化时间、醚化温度、碱用量、氯乙酸用量及含水量对产品取代度的影响，通过正交试验得出了最佳工艺条件：溶剂[V（乙醇）∶V（异丙醇）＝5∶5]用量3.4 mL/g，含水量5%，碱化时间90 min，碱化温度35℃，醚化时间4.5 h，醚化温度55℃，n（氯乙酸）∶n（淀粉）＝1.15∶1，n（NaOH）∶n（淀粉）＝2.55∶1，在此条件下制备的羧甲基淀粉取代度最大，为1.162。%In order to solve the problem of the price increasing because of alginate gradual y turning into food supplies, leading to the printing production costs rising, the novel and low-cost modified paste had be⁃come a hot spot in recent years. Synthesis of carboxymethyl starch with low-cost and good printing perfor⁃mance was studied. Water-soluble high substitution degree of carboxymethyl starch sodium was prepared us⁃ing waxy corn starch as raw material, ethanol and isopropyl as solvent. The effects of ratio of solvent, alkaliza⁃tion time and temperature, etherification time and temperature, the amount of NaOH, the amount of monochlo⁃roacetic acid and water content on the degree of substitution of the product were investigated. Through or⁃thogonal experiments, the optimum technological conditions were obtained as fol ows: the amount of solvent [V(ethanol)∶V(isopropanol)=5∶5] was 3.4 mL/g, the water content was 5%, alkalization time was 90 min, basifi⁃cation temperature was 35 ℃, etherification time was 4.5 h, etherification temperature was 55 ℃, molar ratio of chloroacetic acid and starch was 1.15∶1, the molar ratio of NaOH and starch was 2.55∶1. Under these condi⁃tions, substitution degree of carboxymethyl starch sodium reached maximum value of 1.162.
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