Preparation method of salt-resistant carboxymethyl starch

A technology of carboxymethyl starch and salt resistance, applied in the field of preparation of salt-resistant carboxymethyl starch, can solve the problems of large consumption of organic solvent, high production cost, unstable viscosity, etc., achieve uniform and rapid dissolution, and low production cost , the effect of convenient operation

Inactive Publication Date: 2016-06-22
HANGZHOU HONGBO NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have their own advantages and disadvantages: the dry method is that the starch and the reagent react in the solid phase, the heating is uneven and unstable, and it is difficult for reagents such as sodium hydroxide and chloroacetic acid to penetrate into the interior of the starch granules, so the degree of substitution of the product is not high. , transparency and salt resistance are not good, easy to layer and deteriorate; the water-based method is easy to cause starch gelatinization, and the utilization rate of the etherifying agent is low, and generally cannot produce products with a de

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Pump 460kg of ethanol with a mass percentage concentration of 93% and 40kg of isopropanol into a 3m3 jacketed stainless steel reaction kettle, then add 500kg of tapioca starch under continuous stirring, slowly raise the temperature to 50°C, and keep it warm for 0.5 hours , making it fully swollen to prepare starch milk.

[0022] Towards Add 1kg of nonylphenol polyoxyethylene ether to the medium, turn on the circulating cooling water to cool down to 45°C, and react for 0.5 hours.

[0023] Add sodium chloroacetate evenly within 0.5 hours In the reaction kettle, keep the temperature of the starch system below 40°C during the dosing process, then add 160kg caustic soda evenly, and react at 60°C for 3 hours after adding caustic soda.

[0024] Cool down to 50°C, add 600ml of epichlorohydrin, immediately cover the lid of the reaction kettle, and react for 2 hours.

[0025] Will Cool down to below 40°C, adjust to neutral with 30% hydrochloric acid by volume, an...

Embodiment 2

[0028] Pump 440kg of ethanol with a mass percentage concentration of 92% and 60kg of isopropanol into a 3m3 jacketed stainless steel reaction kettle, then add 500kg of tapioca starch under continuous stirring, slowly raise the temperature to 50°C, and keep it warm for 0.5 hours , making it fully swollen to prepare starch milk.

[0029] Towards Add 1.5kg of nonylphenol polyoxyethylene ether to the medium, and react at 50°C for 0.5 hours.

[0030] Add sodium chloroacetate evenly within 0.5 hours In the reaction kettle, turn on the cooling water at the same time, keep the temperature of the starch system below 40°C during the dosing process, and then evenly add 160kg of caustic soda, after adding caustic soda, react at 60°C for 3 hours.

[0031] The temperature was lowered to 50°C, 800ml of dichloropropane was added, and the lid of the reaction kettle was immediately covered to react for 2 hours.

[0032] Will Cool down to below 40°C, adjust to neutral with 30% h...

Embodiment 3

[0035] Pump 450kg of ethanol with a mass percentage concentration of 92.5% and 50kg of isopropanol into a 3m3 jacketed stainless steel reaction kettle, then add 500kg of tapioca starch under continuous stirring, slowly raise the temperature to 50°C, and keep it warm for 0.5 hours , making it fully swollen to prepare starch milk.

[0036] Towards Add 2.5kg of octylphenol polyoxyethylene ether to the medium, turn on the circulating cooling water to cool down to 45°C, and react for 1 hour.

[0037] Add sodium chloroacetate evenly within 0.5 hours In the reaction kettle, keep the temperature of the starch system below 40°C during the dosing process, then add 160kg caustic soda evenly, and react at 60°C for 3 hours after adding caustic soda.

[0038] The temperature was lowered to 50°C, 250ml of epichlorohydrin was added, and the lid of the reaction kettle was immediately covered to react for 2 hours.

[0039] Will Cool down to below 40°C, adjust to neutral with 30...

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PUM

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Abstract

The invention relates to a preparation method of salt-resistant carboxymethyl starch. A mixed solvent of ethanol and isopropyl alcohol serves as a reaction medium, and multi-step modification of cassava starch is performed in slurry taking the mixed solvent as a medium. The method comprises the following specific steps: swelling the starch to prepare starch milk; adding a surfactant and performing modification such as alkalization and etherification by an 'acid pretreatment process'; and adding a crosslinking agent for a micro-crosslinking reaction. In the method provided by the invention, the surfactant is added as a penetrant, the reagent molecules are promoted to penetrate and spread into the starch particles, and the alkalization efficiency and etherification efficiency are improved; the generation of side reactions can be reduced by adding an etherifying agent before an alkalizer, thus the alkalization and etherification are carried out at the same time, and more thorough etherification reaction is guaranteed; finally, the starch is subjected to micro-crosslinking so as to improve the structure viscosity and enhance the salt resistance; the product viscosity 4% exceeds 40,000, the substitution degree is over 1.0, the salt-viscosity ratio goes beyond 0.5, and the product can be applied to multiple technical fields instead of CMC.

Description

technical field [0001] The invention belongs to the field of chemical modification of natural polymer materials, and in particular relates to a method for preparing salt-resistant carboxymethyl starch by using cassava starch as a raw material and performing multiple denaturation by a slurry method. Background technique [0002] Carboxymethyl starch is a starch derivative obtained by bimolecular nucleophilic substitution reaction between starch and chloroacetic acid under alkaline conditions, commonly known as CMS. It is a white or slightly yellow powder, odorless and non-toxic, soluble in water to form a thick colloidal solution, with good thickening, cohesiveness, dispersibility, emulsification, water retention, film-forming properties, etc. Its structure and properties are similar to carboxymethyl cellulose, and it can replace carboxymethyl cellulose in many occasions and be used in food, medicine, daily chemical, textile, papermaking, petroleum, agricultural production an...

Claims

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Application Information

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IPC IPC(8): C08B31/12C08B31/00
CPCC08B31/006C08B31/12
Inventor 周立陈网根朱国生
Owner HANGZHOU HONGBO NEW MATERIALS
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