Method for producing cationic starch by using homogeneous phase drying method

A technology of cationic starch and starch, applied in the field of grain deep processing, can solve the problems of poor product solubility and uneven mixing of cationic starch, and achieve the effect of solving uneven mixing

Inactive Publication Date: 2012-12-19
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a low-energy, continuous, homogeneous, high-efficiency, environmental-friendly, and simple-process homogeneous coherent method for the production of cationic starch, aiming at the problems of uneven mixing of cationic starch and poor product solubility and the like in the current dry method.
[0006] The technical problems to be solved i

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The extruder was preheated to 120°C. 736.0 g of 3-chloro-2 hydroxypropyltrimethylammonium chloride and 122.0 g of NaOH with a concentration of 65% were dissolved and diluted with 448.0 g of water, respectively. The etherifying agent solution and NaOH solution were mixed with 5.00kg corn starch (water content 11.00%, w / w) in a high-speed mixer and discharged. Then put the starch added with etherifying agent and the starch added with NaOH into the mixer, mix well, and discharge. Put into extruder then, start to stir reaction, and the rotating speed of stirring bar is 100r / min, discharges automatically. Air-dried at 80°C for 8 hours and pulverized to obtain the cationic starch product. The degree of substitution is 0.0472, the solubility index is 98.50% (w / w), the peak viscosity (6%, w / w) is 298.12cp, the viscosity disintegration value (95°C, 30min) is 173.27cp, and the retrograde value (4°C, 3 days) was 4.61%.

Embodiment 2

[0017] The extruder is preheated to 150°C. 535.4 g of 3-chloro-2-hydroxypropyltrimethylammonium chloride and 124.3 g of KOH with a concentration of 65% were dissolved and diluted with 483.0 g of water, respectively. The etherifying agent solution and KOH solution were mixed with 5.00kg of potato starch (water content 11.37%, w / w) in a high-speed mixer and discharged. Then put the starch added with etherifying agent and the starch added with KOH into the mixer, mix well, and unload. Put into reactor then, start stirring reaction, stirring bar rotating speed is 200r / min, discharges automatically. Air-dried at 40°C for 24 hours and pulverized to obtain the cationic starch product. The degree of substitution is 0.0319, the solubility index is 97.68% (w / w), the peak viscosity (6%, w / w) is 214.15cp, the viscosity disintegration value (95°C, 30min) is 121.77cp, and the retrograde value (4°C, 3 days) was 3.72%.

Embodiment 3

[0019] The extruder was preheated to 170°C. 401.5 g of 3-chloro-2 hydroxypropyltrimethylammonium chloride and 66.6 g of NaOH with a concentration of 65% were dissolved and diluted with 506.7 g of water, respectively. The etherifying agent solution and NaOH solution were mixed with 5.00kg corn starch (water content 11.00%, w / w) in a high-speed mixer and discharged. Then put the starch added with etherifying agent and the starch added with NaOH into the mixer, mix well, and discharge. Put into reactor then, start stirring reaction, stirring bar rotating speed is 150r / min, discharges automatically. Air-dried at 40°C for 24 hours and pulverized to obtain the cationic starch product. The degree of substitution is 0.0235, the solubility index is 99.84% (w / w), the peak viscosity (6%, w / w) is 156.15cp, the viscosity disintegration value (95°C, 30min) is 51.54cp, and the retrograde value (4°C, 3 days) was 4.19%.

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Abstract

The invention relates to a method for producing cationic starch by using a homogeneous phase drying method. The method comprises the following steps of: mixing an etherifying agent with starch and mixing alkali with the starch; mixing the starch in which two reagents are added to reduce a destroy function of alkali on the etherifying agent; acquiring a cationic starch crude product in an extruding bulking machine with high temperature, high pressure and high shearing force; taking out the cationic starch crude product; directly drying the crude product until the water content is 11-14 percent; and pulverizing the dried product to obtain a cationic starch product. With the adoption of the method, the problems that the mixture of the cationic starch is not uniform and the product solubility is poor by using the conventional drying method are solved; and the production energy consumption of the cationic starch is low, the reaction is uniform, the waste is not discharged, and the method is effective and continuous. The starch is activated under a high-temperature high-pressure condition, the starch is stirred at high speed, and the etherifying agent and the starch can be uniformly dispersed at the molecular level by virtue of a function of the high shearing force, so that the reaction activity of the starch molecules and the reaction efficiency of the etherifying agent are obviously improved.

Description

(1) Technical field [0001] The invention relates to a method for producing cationic starch by a homogeneous coherent method, which belongs to the field of fine grain processing. (2) Background technology [0002] Starch is a natural high-molecular carbohydrate. There are many hydroxyl groups on starch molecules. Under certain temperature conditions, it can absorb water and swell to gelatinize. Starch has certain viscosity and cohesive force, and it is widely used in industry. However, native native starch affects its application effect due to its structural and performance defects. Cationic starch is one of the main varieties of modified starch. Compared with native starch, cationic starch has the advantages of good fluidity, high viscosity stability, strong permeability, and good cohesive force, etc., and has a wide range of uses in the textile and paper industries. [0003] There are mainly two methods for preparing cationic starch in industry: wet method and dry method....

Claims

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Application Information

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IPC IPC(8): C08B31/08
Inventor 代养勇董海洲侯汉学
Owner SHANDONG AGRICULTURAL UNIVERSITY
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