Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing nanometer lamellar sodium carboxymethyl starch

A nano-scale technology of carboxymethyl starch sodium, which is applied in the field of preparation of carboxymethyl starch sodium, can solve the problems of easy gelatinization of starch, difficulty in penetrating into the interior of starch granules, and low utilization rate of etherifying agent, etc., to achieve Uniform particle size distribution, large specific surface, and smooth surface

Inactive Publication Date: 2013-11-06
WENZHOU UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solid method uses very little solvent, and the reaction is carried out in a solid phase system. It is difficult for small reagent molecules to penetrate into the interior of starch granules, so the degree of substitution of the product is not high.
The disadvantage of the water-based method is that the starch is prone to gelatinization, the utilization rate of the etherifying agent is low, and it is difficult to obtain a CMS product with a high degree of substitution and high viscosity

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing nanometer lamellar sodium carboxymethyl starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 16.0g of tapioca starch and 40g of absolute ethanol into a three-necked flask equipped with a thermometer and a stirrer, stir well to disperse the starch, heat to 40°C, add aqueous sodium hydroxide solution (7.0gNaOH, 30g of water) dropwise for alkalization , maintained at 40°C for 60 minutes to prepare a starch alkalization solution. After the starch was alkalized above, slowly add chloroacetic acid aqueous solution (7.0gClCH 2 COOH, 10g water), heated up to 45°C, reacted in a 400W (40kHz) ultrasonic wave for 20min, then maintained at 45°C for 80min, adjusted the pH value of the reaction solution to 7 with 6mol / L hydrochloric acid after the reaction, and filtered it with suction. The filter cake was washed with 70% ethanol aqueous solution until no chloride ion was detected in the filtrate, and the filter cake was dried at 60° C. to obtain 22.3 g of sodium carboxymethyl starch (CMS), the degree of substitution DS=1.31, and the scanning electron microscope (NovaNanoS...

Embodiment 2

[0034] Add 16.0g of tapioca starch and 50g of 60% ethanol aqueous solution into a three-necked flask equipped with a thermometer and agitator, stir well at 20°C to disperse the starch, add dropwise sodium hydroxide aqueous solution (3.0gNaOH, 30g of water) for alkalization , maintained at 20°C for 20 minutes to prepare a starch alkalization solution, after the starch was alkalized above, slowly add chloroacetic acid aqueous solution (5.0gClCH 2COOH, 10g water), heated up to 30°C, reacted in an ultrasonic wave with a power of 150W (40kHz) for 5min, then maintained at 30°C for 40min, adjusted the pH value of the reaction solution to 7 with 6mol / L hydrochloric acid after the reaction, and filtered it with suction. The filter cake was washed with 70% aqueous ethanol until no chloride ions were detected in the filtrate, and the filter cake was dried at 65°C to obtain 15.1 g of sodium carboxymethyl starch (CMS), with a degree of substitution DS=0.22, round particles, rough surface, ...

Embodiment 3

[0036] Add 16.0 g of tapioca starch and 90% ethanol aqueous solution (50 g of absolute ethanol) into a three-necked flask equipped with a thermometer and a stirrer, stir well to disperse the starch, heat to 40° C., add dropwise an aqueous sodium hydroxide solution (4.0 g NaOH, 25g water) to carry out alkalization reaction, maintain the temperature for 40min to prepare starch alkalization solution, after the starch is alkalized above, slowly add chloroacetic acid aqueous solution (8.0g ClCH 2 COOH, 10g water), heated up to 40°C, placed in ultrasonic waves (400W-40kHz, 10min), and then maintained at a reaction temperature of 40°C for 80min. After the reaction is completed, use 6mol / L hydrochloric acid to neutralize the pH of the reaction solution to 7. After suction filtration, wash with 95% aqueous ethanol until no chloride ions are detected in the filtrate, and dry the filter cake at 50°C to obtain carboxymethyl starch. Sodium (CMS) 22.2g, degree of substitution DS=1.28, flaky...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing nanometer lamellar sodium carboxymethyl starch, which is carried out according to the following steps of: (1) performing alkalization reaction, i.e. mixing starch and absolute ethyl alcohol and aqueous solution of sodium hydroxide and performing a reaction for 20 to 80 minutes at a temperature of 20 to 60 DEG C to obtain alkalized solution; and (2) performing etherification reaction, i.e. dropwise adding aqueous solution of chloroacetic acid into the alkalized solution prepared in the step (1), performing the etherification reaction under the auxiliary action of ultrasonic waves and carrying out post treatment on reaction solution to obtain the nanometer lamellar sodium carboxymethyl starch. Compared with the prior art, the method mainly has the beneficial effects that the method can be directly used for preparing nanometer lamellar sodium carboxymethyl starch particles; the nanometer lamellar sodium carboxymethyl starch particles have uniformly distributed nano particle diameters; the lamellar particles have smooth and flat surfaces and large specific surface; meanwhile, the substitution degree of the sodium carboxymethyl starch prepared by the method is distributed in the range of 0.2 to 1.4.

Description

(1) Technical field [0001] The invention relates to a preparation method of sodium carboxymethyl starch, in particular to a preparation method of nano-scale flake high degree of substitution carboxymethyl starch sodium. (2) Background technology [0002] Sodium Carboxymethyl Starch (Sodium Carboxymethyl Starch, CMS) is one of the main products of modified starch. It is characterized by: white or slightly yellow powder, non-toxic, tasteless, easy to absorb moisture, directly soluble in cold water, but Insoluble in alcohol and ether, soluble in water at room temperature to form a colloidal solution, stable in alkaline or weakly acidic solutions. CMS can be used as emulsifier, thickener, dispersant, stabilizer, sizing agent, film-forming agent and water-retaining agent, etc., and can be widely used in medicine, video, textile, printing and dyeing, oil drilling, daily chemical industry and building materials, casting and Packaging and other fields. [0003] At present, the pre...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/12
Inventor 吴华悦高文霞陈久喜刘妙昌林勰鹏
Owner WENZHOU UNIV