Abstract: Starch is a carboxymethyl chloroacetice acid or alkali to exist in the sodium salt of glucose units of C2, starch on the C6 C3 and hydroxyl etherification procedure. The paper introduces the present research carboxymethyl starch synthesis principle and method, and the substitution degree of carboxymethyl starch test methods were introduced in detail. Experiment with starch as raw materials, anhydrous alcohol or isopropyl alcohol solvent in starch, chloroacetic acid, sodium hydroxide = 1:2:4.88 (Moore ratio), under the condition of high viscosity prepared by solvent high-substitute degree of carboxymethyl starch. Study the dosage of the water temperature, etherification, solvent quantity of CMS viscosity and substitution degree. By contrast experiment data synthesis of high viscosity determination high-substitute degree of CMS.
Keywords: starch; substitution; viscosity; carboxymethyl starch; CMS