The method for preparing ultra-low viscosity sodium carboxymethyl cellulose by adopting low viscosity sodium carboxymethyl cellulose

A technology of sodium carboxymethyl cellulose and low viscosity, which is applied in the production field of sodium carboxymethyl cellulose, which can solve the problem of not getting pure grade CMC-Na, yellowing of CMC-Na products, easy agglomeration and yellowing of products and other problems, to achieve the effect of not reducing the purity, wide application range, and avoiding the loss of washing and dissolution

Inactive Publication Date: 2015-09-02
HANGZHOU HONGBO NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when wanting to obtain lower viscosity CMC-Na by the above method, there are problems: especially high substitution degree (DS1.4-2.1) low viscosity CMC-Na, a part of very low molecular weight CMC-Na during washing and refining It will be lost due to the small eyes of the filter cloth, and the loss is 3-10%; when washing with low concentration of ethanol, the CMC-Na material will agglomerate; and when washing with high concentration of ethanol, the consumption of ethanol will increase. It can't be washed clean, and you can't get pure grade CMC-Na
[0004] Optimizing the process of washing and refining can also further obtain CMC-Na with lower viscosity, but CMC-Na products are prone to agglomeration and yellowing, especially when the 2% viscosity of product B type is reduced to 5mPa.s, CMC-Na products yellow, agglomerated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Wash and refine powdered sodium carboxymethyl cellulose (that is, a commercially available low-viscosity sodium carboxymethyl cellulose product, with a size below 30 mesh, a moisture content below 7%, and a type B 2% viscosity at 85mPa .s, degree of substitution 2.05) into the kneader, under constant stirring, spray a mixture of 95% ethanol, glacial acetic acid and hydrogen peroxide, wherein the quality of ethanol is 25% of powdered sodium carboxymethyl cellulose, glacial acetic acid The quality of the hydrogen peroxide is 0.8% of the powdered sodium carboxymethyl cellulose, and the quality of the hydrogen peroxide is 5% of the powdered sodium carboxymethyl cellulose.

[0028] (2) Mix for 30 minutes, raise the temperature to 60°C, keep the temperature constant, reduce the viscosity for 90 minutes, discharge, dry, and sieve to obtain the finished product.

[0029] After testing, the obtained product B type 2% viscosity is 3mPa.s; B type 30% viscosity is 4000mPa.s, an...

Embodiment 2

[0031] (1) Wash and refine powdered sodium carboxymethyl cellulose (that is, commercially available low-viscosity sodium carboxymethyl cellulose products, the size is below 30 mesh, the moisture content is below 7%, and the B-type 2% viscosity is 10.6 mPa.s, degree of substitution 0.62) into the kneader, under constant stirring, spray a mixture of 94% ethanol, glacial acetic acid and sodium perborate, wherein the quality of ethanol is 30% of powdered sodium carboxymethyl cellulose , the quality of glacial acetic acid is 0.5% of powdery sodium carboxymethylcellulose, and the quality of sodium perborate is 2% of powdery sodium carboxymethylcellulose.

[0032] (2) Mix for 50 minutes, heat up to 55°C, keep the temperature constant, reduce the viscosity for 120 minutes, discharge, dry, and sieve to obtain the finished product.

[0033] After testing, the obtained product B type 2% has a viscosity of 2.5mPa.s.

Embodiment 3

[0035] (1) Wash and refine powdered sodium carboxymethyl cellulose (that is, a commercially available low-viscosity sodium carboxymethyl cellulose product, with a size below 30 mesh, a moisture content below 7%, and a B-type 2% viscosity of 50mPa .s, degree of substitution 1.4) into the kneader, under constant stirring, spray a mixture of 96% ethanol, glacial acetic acid and hydrogen peroxide, wherein the quality of ethanol is 20% of powdered sodium carboxymethyl cellulose, glacial acetic acid The quality of the hydrogen peroxide is 1% of the powdered sodium carboxymethyl cellulose, and the quality of hydrogen peroxide is 10% of the powdered sodium carboxymethyl cellulose.

[0036] (2) Mix for 40 minutes, raise the temperature to 65°C, keep the temperature constant, reduce the viscosity for 90 minutes, discharge, dry, and sieve to obtain the finished product.

[0037] After testing, the obtained product B type 2% has a viscosity of 2.8mPa.s.

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Abstract

The invention relates to the technical field of the production of sodium carboxymethyl cellulose and discloses a method for preparing sodium carboxymethyl cellulose by adopting sodium carboxymethyl cellulose. The method comprises the following steps of: adding washed and fined sodium carboxymethyl cellulose powder to a kneading machine; adding alcohol, organic acid and an oxidant to the kneading machine under the continuous stirring condition for mixing for 30 minutes to 50 minutes; heating up the mixture to 55 DEG C to 65 DEG C, keeping the temperature unchanged, reducing the viscosity for 90 minutes to 120 minute; and discharging, drying, sieving and packaging the treated mixture to obtain the finished product. The method disclosed by the invention is simple in process, short in reaction period, less in device investment, less in material consumption, and solvent-saving; the produced CMC-Na product has the characteristics of being pure and extra-low in viscosity, and has special advantages in high-substituted products, pure products and extra-low viscosity products.

Description

technical field [0001] The invention relates to the technical field of sodium carboxymethylcellulose production, in particular to a method for preparing ultra-low viscosity sodium carboxymethylcellulose by using low-viscosity sodium carboxymethylcellulose. Background technique [0002] There are many ways to manufacture low-viscosity carboxymethylcellulose sodium (CMC-Na). The patent of "Cellulose Ether Industry" V9.N04 and application number 201110315222.9 discloses a low-viscosity CMC-Na manufacturing method: use wood pulp with a low degree of polymerization, through alkalization and degradation, adjust the degree of polymerization of alkali cellulose, and then ether It must be washed and refined to control the viscosity of the final pure CMC-Na product to obtain low-viscosity sodium carboxymethyl cellulose (type B 2% viscosity at 10-100mPa.s). JP2000119303 patent discloses another method for manufacturing low-viscosity sodium carboxymethyl cellulose, which is to add chlo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B11/12C08B11/20
Inventor 陈网根朱国生
Owner HANGZHOU HONGBO NEW MATERIALS
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