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Method for preparing technical grade sodium carboxymethylcellulose with high viscosity and high salt resistance

A technology of sodium carboxymethyl cellulose and high viscosity is applied in the field of preparing technical grade sodium carboxymethyl cellulose with high viscosity and high salt resistance, and can solve the problem that high viscosity products cannot be produced, production and use are restricted, and production costs are high. problems, to achieve the effect of improving product viscosity and cross-linking uniformity, improving cross-linking uniformity and long shelf life

Active Publication Date: 2013-01-23
HEBEI YEZHIYUAN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many kinds of raw materials with a degree of polymerization of 1000-2000, and there is a lot of room for choice. The CMC industry usually uses such raw materials to produce low-viscosity products, because it is impossible to produce qualified high-viscosity products with low-polymerization raw materials and ordinary processes.
In order to improve the viscosity and salt resistance of CMC products, it is necessary to carry out strict airtight oxygen removal treatment on the tooling equipment, and strictly control the process conditions, so the production cost is high, which limits its production and use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing technical-grade high-viscosity and high-salt-resistance sodium carboxymethyl cellulose, comprising the following steps: (1) Opening cellulose raw materials into flocs for use, the cellulose raw materials are wood pulp, and the degree of polymerization is 2000 , the α-cellulose content is 98.5%, and the moisture absorption is 140ml / 15g;

[0027] Mix the sodium hydroxide aqueous solution with a mass concentration of 48.5% and the ethanol aqueous solution with a mass concentration of 88% in advance to obtain a mixed solution of alkali and wine. Cool the mixed solution of alkali and wine to 16°C for use. The quality of the aqueous sodium hydroxide solution is cellulose 0.7 times of raw material quality, the quality of ethanol aqueous solution is 1.5 times of cellulose raw material quality;

[0028] (2) Put 0.2 times the mass of cellulose raw material as solid sodium hydroxide and a buffer into the kneader, the buffer is disodium hydrogen phosphate, an...

Embodiment 2

[0035] A method for preparing technical-grade high-viscosity and high-salt-resistance sodium carboxymethyl cellulose, comprising the following steps: (1) Opening cellulose raw materials into flocs for use, the cellulose raw materials are wood pulp, and the degree of polymerization is 2000 , the α-cellulose content is 95%, and the moisture absorption is 110mL / 15g;

[0036] Mix the sodium hydroxide aqueous solution with a mass concentration of 50% and the ethanol aqueous solution with a mass concentration of 88% in advance to obtain a mixed solution of alkali and wine. Cool the mixed solution of alkali and wine to 25°C for use. The quality of the aqueous sodium hydroxide solution is cellulose 1.1 times of raw material quality, the quality of ethanol aqueous solution is 1.6 times of cellulose raw material quality;

[0037] (2) Put solid sodium hydroxide and trisodium phosphate of 0.15 times the mass of the cellulose raw material into the kneader, and the amount of trisodium phospha...

Embodiment 3

[0044] A method for preparing technical-grade high-viscosity and high-salt-resistance sodium carboxymethyl cellulose, comprising the following steps:

[0045] (1) Open the cellulose raw material into flocculent form for use, the cellulose raw material is bamboo pulp, the degree of polymerization is 1000, the content of α-cellulose is 99.5%, and the moisture absorption is 155mL / 15g;

[0046] Mix the sodium hydroxide aqueous solution with a mass concentration of 48% and the ethanol aqueous solution with a mass concentration of 95% in advance to obtain a mixed solution of alkali and wine, and cool the mixed solution of alkali and wine to 25°C for use. 0.8 times of raw material quality, the quality of ethanol aqueous solution is 1.5 times of cellulose raw material quality;

[0047] (2) Put solid sodium hydroxide and sodium tripolyphosphate 0.25 times the mass of the cellulose raw material into the kneader, add the mixed solution of alkali and wine, and stir until it becomes a past...

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Abstract

The invention discloses a method for preparing a technical grade sodium carboxymethylcellulose with high viscosity and high salt resistance, belonging to the field of organic polymer compound. The method provided by the invention comprises the following steps: (1) opening cellulose raw materials into a flocculent product for use; pre-preparing an alkali-wine mixed solution; (2) alkalizing the mixed solution; (3) etherifying the mixed solution; and (4) after finishing the etherification, drying and crushing the product. The product manufactured by the invention has good stability and long quality guarantee period; the method provided by the invention can effectively improve the viscosity and the cross-linking evenness of the product and effectively reduce the cost, thus having wide market prospect. The physical and chemical indicators of the sodium carboxymethylcellulose prepared by the method provided by the invention are that the purity is 68-75%, the substitution degree D.S is 0.7-0.9, 1% of brooklfield viscosity is 500 -2000 mpas, 2% of NDJ-79 type viscosity is 600 -1000 mpas, and 2% of SVR is 0.85-1.0; the method provided by the invention is widely applied to the industries such as ceramics, petroleum and construction.

Description

technical field [0001] The invention relates to a method for preparing technical-grade high-viscosity and high-salt-resistance sodium carboxymethyl cellulose, which belongs to the field of organic polymer compounds. Background technique [0002] Sodium carboxymethyl cellulose (Na-CMC) is a derivative with an ether structure obtained by chemically modifying natural cellulose. It is an important water-soluble polymer, customarily called CMC. CMC dissolves in water to form a colloidal solution with a certain viscosity, which has the functions of thickening, bonding, film forming, protective glue, water retention, emulsification and suspension, etc. It is widely used in oil drilling, printing and dyeing textiles, papermaking, ceramics, construction, Food processing and daily chemical industry and other fields. [0003] CMC products used in industry usually do not remove the salts and side reaction products produced by the production reaction, and are called technical grade CMC...

Claims

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Application Information

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IPC IPC(8): C08B11/12
Inventor 杨建龙杨改林袁洪波
Owner HEBEI YEZHIYUAN CHEM CO LTD
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