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Carboxymethyl cellulose sodium and preparation method and application thereof

A technology of sodium carboxymethyl cellulose and cellulose, which is applied in the fields of sodium carboxymethyl cellulose and its preparation and application, and can solve the problems of difficult preparation of sodium carboxymethyl cellulose and the like

Pending Publication Date: 2019-10-22
上海长光企业发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to overcome the defects in the prior art that low-substitution degree carboxymethyl cellulose sodium that meets the requirements of crystallinity and substitution position is difficult to prepare, and provides a kind of carboxymethyl cellulose sodium and its preparation method and application

Method used

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  • Carboxymethyl cellulose sodium and preparation method and application thereof
  • Carboxymethyl cellulose sodium and preparation method and application thereof
  • Carboxymethyl cellulose sodium and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0081] (1) Prepare the mixed solution in advance, add 240mL isopropanol (more than 90% purity), 90mL water and 1.0g sodium hydroxide (more than 95% purity) to the system, mix well under the condition of stirring, then stabilize the temperature of the system at Between 25 and 30°C.

[0082] (2) Alkalization step: stabilize the temperature of the system at 25-30°C, add 10g of wood pulp (polymerization degree: 900-1000) into the reaction system, control the feeding process below 30°C, and control the feeding process within 20 minutes or so; then the system is alkalized at 25-35°C, and the reaction time is 60 minutes;

[0083] (3) Etherification step: Slowly add the isopropanol solution containing 1.0g of chloroacetic acid (purity above 95%) to the material after the reaction in step 2 to carry out etherification reaction, and the temperature of the feeding process is controlled between 30~35°C The feeding time is controlled at about 20 minutes. After the addition, the system wa...

Embodiment 2

[0086] (1) Prepare the mixed solution in advance, add 250mL ethanol (more than 90% purity), 100mL water and 1.5g sodium hydroxide (more than 95% purity) to the system, mix well under stirring, and then stabilize the system temperature at 25~ between 30°C.

[0087] (2) Alkalization step: stabilize the temperature of the system at 25-30°C, add 10g of wood pulp (polymerization degree: 900-1000) into the reaction system, control the temperature below 30°C during the feeding process, and control the feeding process within 20 minutes or so; then the system is alkalized at 25-35°C, and the reaction time is 65 minutes;

[0088] (3) Etherification step: Slowly add an ethanol solution containing 2.0 g of chloroacetic acid (purity above 95%) to the material after the reaction in step 2 to carry out etherification reaction. The feeding time is controlled at about 30 minutes. After the addition, the system was heated to 70°C to continue the reaction for 60 minutes;

[0089] (4) Neutraliza...

Embodiment 3

[0091] (1) Prepare the mixed solution in advance, add 200mL isopropanol (more than 90% purity), 20mL water and 2.5g sodium hydroxide (more than 95% purity) to the system, mix well under stirring, and then stabilize the temperature of the system at Between 25 and 30°C.

[0092] (2) Alkalization step: stabilize the temperature of the system at 25-30°C, add 10g of wood pulp (polymerization degree: 1000-1100) into the reaction system, control the temperature below 30°C during the feeding process, and control the feeding process within 20 minutes or so; then the system is alkalized at 25-35°C, and the reaction time is 70 minutes;

[0093] (3) Etherification step: Slowly add the isopropanol solution containing 3.0g of chloroacetic acid (purity above 95%) to the material after the reaction in step 2 to carry out etherification reaction, and the temperature of the feeding process is controlled between 30~35°C During the feeding time, the feeding time was controlled at 25min. After t...

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Abstract

The invention discloses carboxymethyl cellulose sodium and a preparation method and application thereof. The preparation method comprises the following steps that (1) cellulose, shortchain alcohol, water, and sodium hydroxide are subjected to mixed reaction to obtain a mixture A, the ratio of the quality of the cellulose to the volume of the shortchain alcohol is (1:15) to (1:25)g / mL, the ratio ofthe quality of the cellulose to the volume of the water is (1:1)to(1:10)g / mL, the mass ratio of the cellulose to the sodium hydroxide is (1:0.1) to (1:0.8), the shortchain alcohol is an alcohol having 1 to 3 carbon atoms in a carbon chain; and (2), the mixture A in the step (1) is etherified. Thecarboxymethyl cellulose sodiumis low in substitutiondegree, crystallinity and substitution position meet the requirements, substitutionis uniform, moisture absorption performance is good, and good application value is realized in the field of moisturizing materials.

Description

technical field [0001] The invention relates to sodium carboxymethyl cellulose and its preparation method and application. Background technique [0002] Carboxymethyl cellulose sodium (CMCNa for short) is a kind of polyanionic polymer compound obtained after chemical modification with natural fiber as raw material. , synthetic washing, putty powder, imitation porcelain paint, construction glue, cigarettes, putty paste, ceramics, food, medicine and batteries and other industries have a wide range of applications, known as "industrial monosodium glutamate". CMCNa has various properties and can be used as a drug carrier, binder, emulsifier, thickener, and dispersant. [0003] There are multiple quality indicators to measure sodium carboxymethyl cellulose, the most common include purity, degree of substitution (degree of substitution, DS) and viscosity, etc. Generally speaking, the properties of CMCNa vary with DS, for example, when DS When increasing, the transparency and sta...

Claims

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Application Information

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IPC IPC(8): C08B11/12
CPCC08B11/12
Inventor 倪志青朱宏彬张强钱文树
Owner 上海长光企业发展有限公司