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Preparation method of ultrahigh-viscosity sodium carboxymethyl cellulose

A technology of sodium carboxymethyl cellulose and viscosity, applied in the field of chemical modification of natural polymer materials, can solve the problems of inability to meet customers and large market demand, and achieve the effects of simple process, low equipment investment and high viscosity performance

Active Publication Date: 2012-09-19
CHONGQING LIHONG FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current high-viscosity products can no longer fully meet the requirements of customers. Many customers have put forward higher standards for product viscosity, and the market demand for such ultra-high-viscosity products is relatively large, so the current ultra-high-viscosity CMC products are gradually becoming It has become a focus of industry attention, mainly used in food, petroleum, mining and other industries
At present, in the process of producing high-viscosity CMC, domestic manufacturers mainly use inert gas protection during the entire reaction process to prevent oxygen from entering the reactor and cause the degradation of alkali cellulose, resulting in a decrease in product viscosity.
However, the viscosity of the product can only reach above 6000mPa.s (1% Brookfield type viscosity, 3# rotor, under the condition of speed 30R), which cannot meet the needs of customers

Method used

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  • Preparation method of ultrahigh-viscosity sodium carboxymethyl cellulose
  • Preparation method of ultrahigh-viscosity sodium carboxymethyl cellulose

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A certain amount of shredded refined cotton, mixed with 1.5 times the mass of ethanol solution and 0.3 times the mass of water, is put into the reactor, and then 0.96 times the mass of sodium hydroxide aqueous solution and 0.13 times the mass of sodium hydroxide solid Put it into the reactor. After feeding, remove the air in the reactor to make the vacuum degree reach -0.08MPa, fill the reactor with inert gas to make the internal pressure of the reactor greater than 0.02MPa, repeat the above vacuuming and inert filling Gas operation 2-3 times, get rid of the air in the reactor as much as possible, after stirring and alkalizing for 70 minutes, spray the ethanol solution of chloroacetic acid with 1.18 times of quality evenly into the reactor, get rid of the air in the reactor, make The vacuum degree reaches -0.08MPa, and then the inert gas is filled into the reactor, so that the internal pressure of the reactor is greater than 0.02MPa, and then the etherification reaction ...

Embodiment 2

[0031] A certain amount of shredded refined cotton, mixed with 1.0 times the mass of ethanol solution and 0.8 times the mass of water, is put into the reactor, and then 0.60 times the mass of sodium hydroxide aqueous solution and 0.30 times the mass of sodium hydroxide solid Put it into the reactor. After feeding, remove the air in the reactor to make the vacuum degree reach -0.08MPa, fill the reactor with inert gas to make the internal pressure of the reactor greater than 0.02MPa, repeat the above vacuuming and inert filling The operation of the gas is 2-3 times, try to get rid of the air in the reactor, after stirring and alkalizing for 50 minutes, spray the ethanol solution of chloroacetic acid with 1.50 times the quality evenly into the reactor, and get rid of the air in the reactor, so that The vacuum degree reaches -0.08MPa, and then the inert gas is filled into the reactor, so that the internal pressure of the reactor is greater than 0.02MPa, and then the etherification ...

Embodiment 3

[0033] A certain amount of shredded refined cotton, mixed with 2.0 times the mass of ethanol solution and 0.8 times the quality of water, is put into the reactor, and then 0.78 times the quality of sodium hydroxide aqueous solution and 0.25 times the quality of sodium hydroxide solid Put it into the reactor. After feeding, remove the air in the reactor to make the vacuum degree reach -0.08MPa, fill the reactor with inert gas to make the internal pressure of the reactor greater than 0.02MPa, repeat the above vacuuming and inert filling Gas operation 2-3 times, get rid of the air in the reactor as much as possible, after stirring and alkalizing for 60 minutes, spray the ethanol solution of chloroacetic acid with 1.24 times of quality evenly into the reactor, get rid of the air in the reactor, make The vacuum degree reaches -0.08MPa, and then the inert gas is filled into the reactor, so that the internal pressure of the reactor is greater than 0.02MPa, and then the etherification ...

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Abstract

The invention relates to a preparation method of ultrahigh-viscosity sodium carboxymethyl cellulose, which comprises the following steps: by using refined cotton as the main raw material and an ethanol water solution / water mixed solution as a reaction medium, alkalifying, etherifying, washing, carrying out rake drying, baking, crushing and the like to obtain the ultrahigh-viscosity sodium carboxymethyl cellulose. In order to ensure the alkalifying effect, a certain amount of sheet alkali is added during alkalifying to enhance the utilization ratio of acid. The method provided by the invention has the advantages of simple production process, short reaction time, low equipment investment and low raw material consumption; and the sodium carboxymethyl cellulose produced by the method has high viscosity, wherein the viscosity of 1% Brookfield (3# rotor, under the condition of rotation speed 30R) is up to higher than 10000mPa.s.

Description

technical field [0001] The invention relates to a preparation method of ultra-high viscosity sodium carboxymethyl cellulose, which belongs to the field of chemical modification of natural polymer materials. Background technique [0002] Sodium carboxymethylcellulose (CMC) is an ionic cellulose ether, a water-soluble salt, and a polymer compound in which the hydrogen atoms on the anhydrous glucose unit in cellulose are replaced by carboxymethyl groups. It is made of refined cotton as the main raw material, with ethanol as the medium, and refined through alkalization, etherification, washing, raking, drying, crushing and other processes. , water retention, emulsification and suspension, etc., widely used in food, toothpaste, ceramics, oil drilling, papermaking, medicine, textile, printing and dyeing, paint, cosmetics and other industrial fields, commonly known as "industrial monosodium glutamate", currently the world has produced 250 Various types of CMC are used in different...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/12
Inventor 陈洋溢何玉明陈静郭鸿雁李友琦
Owner CHONGQING LIHONG FINE CHEM
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