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Physical oxidative carboxymethyl composite modified starch and preparation method thereof

A technology for compounding modified starch and modified starch, applied in the field of modified starch, can solve the problems of unstable substitution degree and viscosity, destruction of alcohol-water balance system, low average substitution degree, etc. The effect of high utilization

Inactive Publication Date: 2015-05-06
HENAN HENGRUI STARCH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional process of preparing carboxymethyl starch mostly uses raw starch for inorganic alkalization and etherification. In this heterogeneous system, the etherification reaction mainly occurs in the amorphous region of the starch, and it is difficult for the etherification agent to reach the crystalline region. Hydroxyl groups lead to uneven reaction, the substituents are mostly distributed on the surface of starch granules, the average degree of substitution is not high, the utilization rate of raw materials is low, and the product performance is unstable, which restricts the application of the product
Moreover, in the existing production process, the production process is unreasonable, the alcohol-water balance system in the reactor is destroyed, the efficiency of the etherification agent is low, and starch gelatinization and agglomeration are prone to occur, resulting in cost waste, and its degree of substitution and viscosity are also unstable. , which limits its application in many fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of physical oxidation carboxymethyl complex modified starch, prepared by the following method:

[0038] (1) adding the original starch into the stirring ball mill for mechanical activation, the time of the mechanical activation is 40min;

[0039] (2) Add 300 parts of 95% alcohol and 32 parts of NaOH into the porcelain reactor, stir for 25 minutes, and heat up to 42°C;

[0040] (3) Take 100 parts of the mechanically activated starch in step (1), add it to the porcelain reactor in step (2), heat up to 50°C, and stir for 60 minutes;

[0041] (4) Add 120 parts of sodium chloroacetate to the porcelain reaction kettle of step (3), continue to stir for 25 minutes, and maintain the temperature at 50° C. to obtain starch milk;

[0042] (5) adding a mixed solution of 30% hydrochloric acid and 70% alcohol to the starch milk obtained in step (4), adjusting the pH to be neutral;

[0043] (6) Spray 3.5 parts of hydrogen peroxide in the starch milk adjusted to neutrality in s...

Embodiment 2

[0048] A preparation method for physically oxidizing carboxymethyl complex modified starch, comprising the following steps:

[0049] (1) adding the original starch into the stirring ball mill for mechanical activation, the time of the mechanical activation is 70min;

[0050] (2) Add 600 parts of alcohol with a concentration of 78% and 28 parts of NaOH to the porcelain reactor, stir for 35 minutes, and heat up to 50°C;

[0051] (3) Take 100 parts of starch mechanically activated in step (1), add it to the porcelain reactor in step (2), heat up to 65°C, and stir for 40 minutes;

[0052] (4) Add 100 parts of sodium chloroacetate to the porcelain reactor of step (3), continue stirring for 15 minutes, and maintain the temperature at 65° C. to obtain starch milk;

[0053] (5) Adding a mixture of 30% hydrochloric acid and 80% alcohol to the starch milk obtained in step (4), adjusting the pH to be neutral;

[0054] (6) Spray 7 parts of hydrogen peroxide in the starch milk adjusted t...

Embodiment 3

[0059] A preparation method for physically oxidizing carboxymethyl complex modified starch, comprising the following steps:

[0060] (1) adding the raw starch into the stirring ball mill for mechanical activation, the time of the mechanical activation is 55min;

[0061] (2) Add 450 parts of alcohol with a concentration of 85% and 38 parts of NaOH to the porcelain reactor, stir for 30 minutes, and heat up to 35°C;

[0062] (3) Take 100 parts of starch mechanically activated in step (1), add it to the porcelain reactor of step (2), heat up to 57°C, and stir for 50 minutes;

[0063] (4) Add 73 parts of sodium chloroacetate to the porcelain reactor of step (3), continue to stir for 20 minutes, and maintain the temperature at 57° C. to obtain starch milk;

[0064] (5) Adding a mixture of 30% hydrochloric acid and 75% alcohol to the starch milk obtained in step (4), adjusting the pH to neutral;

[0065] (6) Spray 10 parts of hydrogen peroxide in the starch milk adjusted to neutral...

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PUM

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Abstract

The present invention relates to technical field of modified starch and provides physical oxidative carboxymethyl composite modified starch and a preparation method thereof. The modified starch is prepared from the following raw materials: raw starch, alcohol, inorganic alkali, sodium chloroacetate, hydrochloric acid and hydrogen peroxide. According to the carboxymethyl composite modified starch provided by the invention, the process steps of firstly mechanically activating the raw starch, etherifying the carboxymethyl and then carrying out hydrogen peroxide oxidation are adopted; therefore, the proportion of alcohol and water in a carboxymethylation reaction segment system can be favorably controlled to avoid expansion and dissolution of starch granules, so as to ensure high substitution ratio of the prepared product; in addition, due to the process operation of first etherification and then oxidation, the product viscosity can be controlled more accurately. The preparation method of the carboxymethyl composite modified starch provided by the invention can be used for preparing carboxymethyl starch with high substitution ratio and low viscosity by using mechanically activated corn, cassava and waxy maize starch as raw materials, the operation is convenient, the process flexibility is strong, the continuity is good, the utilization rate of equipment is high and the production efficiency is high.

Description

technical field [0001] The invention relates to the technical field of modified starch, in particular to a physically oxidized carboxymethyl compound modified starch and a preparation method thereof. Background technique [0002] Carboxymethyl starch is a cold-water soluble anionic starch derivative. It is widely used in textile, printing and dyeing, papermaking, daily chemical, food, petroleum and other fields, and is known as "industrial monosodium glutamate". Oxidation of carboxymethyl-modified starch not only introduces carboxymethyl groups, but also carbonyl and carboxyl groups, so that the starch has better fluidity, softness, abrasion resistance, hydrophilicity, solubility and good film-forming properties etc. It can be used as food stabilizer, fresh-keeping agent, welding rod adhesive, flocculant and ceramic glazing, etc. [0003] The traditional process of preparing carboxymethyl starch mostly uses raw starch for inorganic alkalization and etherification. In this h...

Claims

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Application Information

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IPC IPC(8): C08B31/12C08B31/18
Inventor 吴宗帅张淑芬吴磊朱津津褚冰胡荣柳张永
Owner HENAN HENGRUI STARCH TECH CO LTD