Preparation method of high-substitution-degree sodium carboxymethylcellulose
A technology of sodium carboxymethyl cellulose and alkali cellulose, applied in the preparation of sodium carboxymethyl cellulose with a high degree of substitution, in the field of sodium carboxymethyl cellulose with a high degree of substitution, can solve the problems of low substitution degree of CMC and achieve Effect of improving uniformity and high uniformity
Inactive Publication Date: 2015-09-09
LUZHOU NORTH CHEM IND
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Problems solved by technology
[0007] Through literature search, there are some researches and reports on preparing CMC from refined cotton and unrefined cotton both at home and abroad, such as CN103755816A, CN1272346C etc.; Low degree of substitution
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[0035] The above-mentioned content of the present invention will be further described in detail below through specific implementation in the form of examples, to illustrate but not limit the present invention.
[0036] (1) Raw material ratio
[0037] The refined cotton was pulverized into 25 mesh refined cotton powder, and the cotton powder was used as raw material to test 4 batches, the main raw materials were 2 kg of refined cotton powder and 20 kg of isopropanol.
[0038] Table 1
[0039]
[0040] (2) Process steps
[0041] Alkalization reaction: Alkali cellulose is obtained by alkalizing the refined cotton powder with isopropanol as the reaction medium and sodium hydroxide;
[0042] Among them, the alkalization reaction temperature is 15-30°C, and the time is 90min;
[0043] Etherification reaction: Perform etherification reaction of alkali cellulose and chloroacetic acid to obtain crude carboxymethyl cellulose sodium, after the etherification is completed, cool d...
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The invention relates to a preparation method of high-substitution-degree sodium carboxymethylcellulose, particularly to a method for preparing high-substitution-degree sodium carboxymethylcellulose in different viscosities prepared by adopting a solvent slurry method and taking purified cotton as a raw material, and belongs to the field of natural macromolecule chemical modification. The preparation method of sodium carboxymethylcellulose takes the purified cotton as the raw material and comprises the following steps: (1) crushing the purified cotton; (2) carrying out the quaternization; (3) carrying out the etherification reaction; (4) neutralizing and washing; (5) drying and obtaining the sodium carboxymethylcellulose. The sodium carboxymethylcellulose is prepared by adopting the solvent slurry method, the material is suspended in a reaction medium in the reaction process and reacts under the high-speed stirring of a reaction kettle, so the uniformity of the product is remarkably improved, and the sodium carboxylmethylcellulose product high in uniformity is obtained.
Description
technical field [0001] The invention relates to a method for preparing sodium carboxymethyl cellulose with a high degree of substitution, in particular to a method for preparing sodium carboxymethyl cellulose with a high degree of substitution of different viscosities by using refined cotton as a raw material and using a solvent slurry method, which belongs to the natural high Molecular chemical modification field. Background technique [0002] Sodium carboxymethylcellulose (Na-CMC, hereinafter referred to as CMC) is a water-soluble cellulose ether. It introduces sodium carboxymethyl groups into the molecular chain of cellulose after alkalization and etherification. It belongs to ionic cellulose ether and has the characteristics of thickening, bonding, water retention, emulsification, film formation and protective colloid. It is widely used It is widely used in petroleum exploration, ceramics, food, cosmetics, printing and dyeing, paper making, textile, paint, leather, plas...
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Inventor 王建和张涛徐泽勇罗南彬吴茂费利平
Owner LUZHOU NORTH CHEM IND