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Method for preparing high-retention environmental-friendly one-step double-modified starch

An environmentally friendly double-modified starch technology, applied in the field of starch denaturation, can solve the problems of difficult stable control of product quality, complicated production process, and long reaction time, and achieve bright printing colors, which is conducive to the recycling of broken paper and reaction The effect of shortening the time

Inactive Publication Date: 2013-04-03
GUANGXI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet the special requirements of papermaking surface sizing, textile sizing, and adhesive application processes, starch manufacturers at home and abroad generally use wet, dry, semi-dry, or dry-wet combinations to prepare cationic surface sizing starch. The production process is complicated. The reaction time is long, the energy consumption is high, the pollution is large, and the product quality is difficult to control stably

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Spray 15ml of ethanol evenly into 1200g of raw cassava starch, add 11g of sodium silicate, 9.5g of calcium hydroxide, and mix well, then add in-situ activated 3-chloro-2-hydroxypropyltrimethylammonium chloride 80g (activate 51g of 3-chloro-2-hydroxypropyltrimethylammonium chloride with a concentration of 30% and 51g of 3-chloro-2-hydroxypropyltrimethylammonium chloride with a concentration of 30%). Place it for 45 hours; add 73g of hydrogen peroxide and 1.5g of copper sulfate, and mix well; then put the starch into a microwave reactor, and carry out etherification and oxidation reactions simultaneously under normal pressure conditions. The microwave irradiation time is 20 minutes, and the reaction temperature 90-100°C; add 45g of citric acid, mix thoroughly and evenly, and obtain the product of the present invention.

Embodiment 2

[0034] Spray 10ml of ethanol evenly into 900g of raw corn starch, add 6g of sodium trimetaphosphate, 3g of sodium tetraborate, and 8.5g of calcium oxide, and mix well, then add 3-chloro-2-hydroxypropyltri 102.2g of methyl ammonium chloride (67.3g of 69% 3-chloro-2-hydroxypropyltrimethylammonium chloride activated with 34.9g of 30% sodium hydroxide), fully mixed again, in The temperature is 30-35°C and placed for 50 hours; add 19.2g of ammonium persulfate and 0.3g of ferrous sulfate, and mix well; then put the starch into a microwave reactor, and carry out etherification and For the oxidation reaction, the microwave irradiation time is 13 minutes, and the reaction temperature is 60-70° C.; 16 g of fumaric acid is added, fully mixed and uniform, and the product of the present invention is obtained.

Embodiment 3

[0036]Spray 7.5ml of ethanol evenly into 1000g of cassava raw starch, add 9g of sodium metasilicate, 10.5g of calcium hydroxide, and mix well, then add 3-chloro-2-hydroxypropyl trimethyl chloride activated on site Ammonium chloride 70.1g (activate 47.4g of 69% 3-chloro-2-hydroxypropyltrimethylammonium chloride with 22.7g of 30% sodium hydroxide), mix well again, and heat at a temperature of 40 Place it at ~45°C for 24 hours; add 88g of hydrogen peroxide and 0.28g of nickel sulfate, and mix well; then put the starch into a microwave reactor, and carry out etherification and oxidation reactions at the same time under normal pressure conditions, microwave irradiation time After 10 minutes, the reaction temperature is 80-85°C; after the starch is cooled to normal temperature, 23g of acetic acid is added and mixed well to obtain the product of the present invention.

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Abstract

The invention discloses a method for preparing high-retention environmental-friendly one-step double-modified starch. In the method, native starch is used as the raw material and is added with adjuvants, i.e. an organic solvent, an etherifying agent, a catalyst, an activating agent, a dispersing agent, an oxidizing agent and a stabilizer; and two modification reactions of cation etherification and oxidation are completed in one step by adopting a microwave semi-dry method so as to produce the high-retention environmental-friendly double-modified starch. According to the invention, the reactions of cation etherification and oxidation are simultaneously carried out under the same microwave condition; the process design is scientific and reasonable; and starch paste has the characteristics of low viscosity, good rheological property and high bonding strength. A microwave semi-dry reagent has high conversion rate; no three wastes (waste gas, waste water and industrial residue) are discharged basically; damage to the environment caused by wastes generated by the chemical reactions can be obviously reduced; and the method has obvious economic benefits.

Description

technical field [0001] The invention belongs to the technical field of starch denaturation, and in particular relates to a method for preparing a high-retention and environment-friendly one-step double-modified starch. Background technique [0002] As a widely existing natural resource, starch has become an important industrial raw material. Starch and its deep-processed products are widely used in many industries such as food, textiles, papermaking, medicine, adhesives, casting, and oil exploration. Because some properties of native starch limit its industrial application, people have developed starch denaturation technology according to the structure and physical and chemical properties of starch, so that starch has better performance, wider application and more outstanding effect, and through applied research, it has continuously opened up new technologies. field of application. Cationic starch is used for surface sizing. Because of its positive charge, it has strong ch...

Claims

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Application Information

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IPC IPC(8): C08B31/12C08B31/18D21H21/16
Inventor 韦爱芬谭学才
Owner GUANGXI UNIV FOR NATITIES
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