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Preparation method of nanometer amphoteric starch

A kind of amphoteric starch and nanotechnology, which is applied in the field of starch denaturation to achieve the effects of easy access to raw materials, reduced production costs, and simple production processes

Active Publication Date: 2013-12-11
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the inherent molecular structure of starch, there are certain limitations in the preparation of nano starch by the above methods.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 10kg of corn starch, add 600g of glycerin, 600g of 2,3-epoxypropyltrimethylammonium chloride, 200g of sodium hydroxide, add distilled water to adjust the water content of the system to 20%, and mix well in a high-speed mixer. Adjust the screw speed of the twin-screw extruder to 280rpm, and set the temperature of the eight sections of the extruder to 60°C, 80°C, 100°C, 110°C, 120°C, 125°C, 130°C, 135°C, and the outlet of the extruder The die hole diameter is 5mm. Put the mixed material into the twin-screw extruder through the feeder for extrusion, and inject 60% of the mixed solution of sodium chloroacetate and sodium hydroxide (wherein sodium chloroacetate 400g , sodium hydroxide 100g), and inject 80g of cross-linking agent glyoxal into the barrel of the seventh section with a liquid spray gun. Put the extruded product into an oven at a temperature of 35° C., dry the extruded product, cool it at room temperature, and pulverize it with a pulverizer to obtain a nan...

Embodiment 2

[0026] Weigh 10kg of corn starch, add 700g of glycerin, 800g of 2,3-epoxypropyltrimethylammonium chloride, 220g of sodium hydroxide, add distilled water to adjust the water content of the system to 25%, and mix well in a high-speed mixer. Adjust the screw speed of the twin-screw extruder to 300rpm, and set the temperature of the eight sections of the extruder to 60°C, 85°C, 105°C, 115°C, 120°C, 125°C, 130°C, 135°C, and the discharge port of the extruder The die hole diameter is 5mm. Put the mixed material into the twin-screw extruder through the feeder for extrusion, and inject 60% of the mixed solution of sodium chloroacetate and sodium hydroxide (wherein sodium chloroacetate 600g , sodium hydroxide 120g), and inject 100g of cross-linking agent glyoxal into the cylinder body of the seventh section with a liquid spray gun. Put the extruded product into an oven at a temperature of 35° C., dry the extruded product, cool it at room temperature, and pulverize it with a pulverizer...

Embodiment 3

[0028] Weigh 15kg of corn starch, add 1200g of glycerin, 900g of 2,3-epoxypropyltrimethylammonium chloride, 375g of sodium hydroxide, add distilled water to adjust the water content of the system to 25%, and mix well in a high-speed mixer. Adjust the screw speed of the twin-screw extruder to 300rpm, and set the temperature of the eight sections of the extruder to 50°C, 75°C, 105°C, 115°C, 120°C, 125°C, 130°C, 135°C, and the discharge port of the extruder The die hole diameter is 6mm. Put the mixed material into the twin-screw extruder through the feeder for extrusion, and inject 60% of the mixed solution of sodium chloroacetate and sodium hydroxide (750g of sodium chloroacetate) into the fifth section of the extruder with a liquid spray gun , Sodium Hydroxide 195g), and inject 135g of cross-linking agent glyoxal into the cylinder body of the seventh section with a liquid spray gun. Put the extruded product into an oven at a temperature of 35° C., dry the extruded product, coo...

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Abstract

The invention discloses a preparation method of nanometer amphoteric starch. The preparation method comprises the following steps of: adding a plasticizing agent, a cationic etherifying agent and an alkalizer by taking native starch as a raw material; uniformly mixing in a high-speed stirrer; extruding through a double screw extruder (an eight-section cylinder body); injecting an anionic reagent and the alkalizer on a fifth-section cylinder body position through a liquid spray gun, and injecting a cross-linking agent on a seventh-section cylinder body position through the liquid spray gun; extruding materials, then discharging through the discharge port of the double screw extruder, and then drying, cooling and crushing to obtain the nanometer amphoteric starch. The nanometer amphoteric starch prepared through the method disclosed by the invention achieves the cationic substitution degree of 0.01-0.15, achieves the anionic substitution degree of 0.01-0.1 and achieves the average particle diameter of 100-400 nanometers; the method disclosed by the invention can be used for producing the nanometer amphoteric starch by firstly using the double screw extruder in domestic and provides a basis for the application of the nanometer amphoteric starch in a paper-making industry.

Description

technical field [0001] The invention belongs to the technical field of starch denaturation, in particular to a preparation method of nanometer amphoteric starch. Background technique [0002] Starch is an important renewable and biodegradable natural resource. There are many hydroxyl groups on starch molecules. Under certain temperature conditions, it can absorb water and swell and gelatinize. It has certain viscosity and cohesive force. It is widely used in industry Applications. With the development of the paper industry, the functional requirements of starch products are higher, such as better film-forming properties, high viscosity stability, strong permeability, good adhesion, anti-aging, shear resistance and other properties. Amphoteric starch is one of the main varieties of modified starch. It refers to the modified starch with both cationic and anionic groups connected to the starch chain. It has multiple structures such as cationic starch, anionic starch, and natur...

Claims

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Application Information

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IPC IPC(8): C08B31/12C08B31/00B29C47/92B29C48/92
CPCB29C48/04B29C48/40B29C48/875B29C48/911B29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 陈启杰张雄飞
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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