Preparation method for cassava starch modified by combining three kinds of modification processes

Abstract

A disclosed preparation method for cassava starch modified by combining three kinds of modification processes is characterized by comprising: taking starch as a raw material, employing a wet-process crosslinking-oxidation-esterification chemical modification technological route, specifically, performing a crosslinking reaction and an oxidation reaction on an active starch slurry at the same time, then adding a pretreated composite esterification reagent to perform esterification reaction, and adjusting the pH value of the starch slurry to 5.0-6.5, so as to finish combined modification of cassava starch, filtering to obtain wet starch with the water content of 35% or less, then adding polyethylene glycol, mixing uniformly, and performing drying, cooling, crushing and sieving, so as to obtain the cassava starch modified by combining three kinds of modification processes. Only one time of post-processing process comprising washing, centrifugation, drying and the like is performed, the technological process is continuous and automatic, energy and reaction time are saved; and the product is low in gelatinization temperature, good in formability, improved in permeability, caking property, film forming ability and anti-ageing property, and is suitable for being used as a coating adhesive and a surface sizing agent in papermaking industry, a sizing agent in weaving industry, an industrial binder and the like.

Description

technical field [0001] The invention belongs to the technical field of modified starch, and relates to a preparation method of ternary compound modified tapioca starch which is combined to prepare cassava modified starch in a cross-linking-oxidation-esterification manner. Background technique [0002] With the development of food, textiles, papermaking or daily industrial products, my country has realized the industrial production of modified starch since the 1980s, and its products are basically once-modified starch products, such as oxidized starch, acid-thinned starch, acetic acid Ester starch, phosphate ester starch, cross-linked starch, carboxymethyl starch, cationic starch, pregelatinized starch, etc. However, single modified starch products cannot meet the performance requirements in some industries or when making some high-end products. For example: high-grade food, paper or textiles, etc. Composite modified starch refers to the starch in which two or more reactive ...

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Problems solved by technology

[0004] It can be seen from the open literature that: with tapioca native starch as raw material, epichlorohydrin as crosslinking agent, sodium hypochlorite as oxidant, maleic anhydride and acetic anhydride mixed solution as complex esterification agent, wet crosslinking -Oxidation-esterification denaturation process route, and after polyethylene glycol solution treatment, compound denatured cassava starch is obtained. At present, there is no public literature report in China.