CN112679619A - Manufacturing method of sodium carboxymethylcellulose with novel structure - Google Patents

Abstract

The invention discloses a method for manufacturing sodium carboxymethylcellulose with a novel structure, which comprises the following preparation steps: s1 preparation of CMC: spraying dilute hydrochloric acid from the surface of CMC to acidify the surface of CMC, washing and drying to obtain CMC acid and CMC in certain proportion; s2 acidification: paving 200 parts of CMC in an acidification room, and uniformly spraying 10-100 parts of 3-5% diluted hydrochloric acid on the surface of the CMC for acidification; s3 washing: washing the acidified CMC with 65-75% alcohol water solution, and centrifuging to remove the solvent; s4 drying: putting the CMC without the solvent into a drying room, drying for 1-3 hours at 60-80 ℃, and pulverizing to obtain the CMC with a novel structure. The sodium carboxymethyl cellulose with the novel structure is essentially formed by mixing CMC acid and CMC. The preparation method comprises spraying dilute hydrochloric acid on the surface of CMC to acidify the surface of CMC, and drying to obtain CMC acid and CMC in a certain proportion.

Description

Manufacturing method of sodium carboxymethylcellulose with novel structure

Technical Field

The invention belongs to the field of energy materials, relates to a method for manufacturing sodium carboxymethyl cellulose, and particularly relates to a method for manufacturing sodium carboxymethyl cellulose with a novel structure.

Background

Sodium carboxymethylcellulose (hereinafter abbreviated as CMC) is a multifunctional polymer compound obtained by chemically modifying natural cellulose, and is widely used in the fields of food, medicine, textile and the like, and is called as "industrial monosodium glutamate". CMC can be dissolved in water to obviously enhance the viscosity of the solution and has the excellent functions of thickening, dispersing, emulsifying, protecting colloid and the like. At present, a water medium method and a solvent method are commonly adopted for producing CMC, the former method has simple equipment, but water is difficult to conduct heat and the permeability of the water in cellulose is poor, so that the etherification process is insufficient, and the finally obtained CMC product has poor quality and higher salt content and water content; the home and abroad high-quality CMC is prepared by adopting a solvent method, and the organic solvent has the advantages of fast heat and mass transfer, less side reaction, short production period and high product quality. However, both main processes are cellulose alkalization, then etherification of the alkali cellulose, and finally subsequent treatment. The main raw materials comprise a cellulose raw material, a catalyst, an alkalizer, an etherifying agent and the like.

CN103755816A discloses a preparation method of sodium carboxymethylcellulose. The sodium carboxymethylcellulose is prepared by a semi-dry process of an organic solvent, and wood pulp or paper pulp is used as a raw material, and the method comprises the following steps: alkalization reaction: carrying out an alkalization reaction on the raw materials and sodium hydroxide by taking water as a medium to obtain alkali cellulose; and (3) etherification reaction: carrying out etherification reaction on the alkali cellulose and monochloroacetic acid to obtain a sodium carboxymethylcellulose crude product; neutralizing and washing: neutralizing the crude sodium carboxymethylcellulose in an aqueous alcohol solution, and washing in alcohol; and (3) drying treatment: drying, crushing and sieving the obtained solid substance to obtain the sodium carboxymethylcellulose.

The above-mentioned technology has the problems of low product substitution degree, complex process conditions and high cost in terms of process method, and from the preparation point of view, the molecular weight, substitution degree and viscosity still need to be further improved.

Disclosure of Invention

The invention provides a method for manufacturing sodium carboxymethylcellulose with a novel structure aiming at the defects in the background technology.

The invention aims to solve the problems in the background art, adopts the following technical scheme, and is a manufacturing method of sodium carboxymethylcellulose with a novel structure, which is characterized in that: the method comprises the following steps:

a method for preparing sodium carboxymethylcellulose with a novel structure comprises the following preparation steps:

s1 preparation of CMC: spraying dilute hydrochloric acid from the surface of CMC to acidify the surface of CMC, washing and drying to obtain CMC acid and CMC in certain proportion;

s2 acidification: paving 200 parts of CMC in an acidification room, and uniformly spraying 10-100 parts of 3-5% diluted hydrochloric acid on the surface of the CMC for acidification;

s3 washing: washing the acidified CMC with 65-75% alcohol water solution, and centrifuging to remove the solvent;

s4 drying: putting the CMC without the solvent into a drying room, drying for 1-3 hours at 60-80 ℃, and pulverizing to obtain the CMC with a novel structure.

Preferably, the operation of step S2 is performed in an acidification room.

The CMC with the novel structure is used on medical materials, so that the medical materials can keep the shape in a body for a certain period and meet the absorption or discharge requirements of the body. For example, as a healing prevention material, a base material for DDS, an absorbent suture reinforcement material, an artificial dura mater, a bone setting material, or the like; after various clinical operations such as cardiac surgery, plastic surgery, cranial neurosurgery, obstetrics and gynecology, the healing of the trauma, the affected part and the like becomes a great problem. For example, when pain or sequelae are severe, it may be desirable to perform a dissection operation at the previously healed site. If the wound is healed, the operation on the original diseased part is difficult. The use of this new structure of CMC makes the healing prevention material more practical in order to prevent the healing of body tissues, and thus, to develop the healing prevention material. Meanwhile, the method has the advantages of simple process method, low production cost and environmental friendliness.

Drawings

FIG. 1 is a flow chart of the preparation of lithium carboxymethylcellulose for lithium batteries according to the present invention;

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a technical scheme that: a manufacturing method of sodium carboxymethylcellulose with a novel structure comprises the following steps:

s1 preparation of CMC: spraying dilute hydrochloric acid from the surface of CMC to acidify the surface of CMC, washing and drying to obtain CMC acid and CMC in certain proportion;

s2 acidification: paving 200 parts of CMC in an acidification room, and uniformly spraying 10-100 parts of 3-5% diluted hydrochloric acid on the surface of the CMC for acidification;

s3 washing: washing the acidified CMC with 65-75% alcohol water solution, and centrifuging to remove the solvent;

s4 drying: putting the CMC without the solvent into a drying room, drying for 1-3 hours at 60-80 ℃, and pulverizing to obtain the CMC with a novel structure.

Preferably, the operation of step S2 is performed in an acidification room.

The CMC with the novel structure is effective on medical materials, particularly healing prevention materials, is suitable for human bodies, is easy to absorb, can exert the effect of preventing healing and treating wounds with controllable time limit of function and dissolution.

While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (2)

1. A manufacturing method of sodium carboxymethylcellulose with a novel structure is characterized by comprising the following steps: the preparation method comprises the following preparation steps:

s1 preparation of CMC: spraying dilute hydrochloric acid from the surface of CMC to acidify the surface of CMC, washing and drying to obtain CMC acid and CMC in certain proportion;

s2 acidification: paving 200 parts of CMC in an acidification room, and uniformly spraying 10-100 parts of 3-5% diluted hydrochloric acid on the surface of the CMC for acidification;

s3 washing: washing the acidified CMC with 65-75% alcohol water solution, and centrifuging to remove the solvent;

s4 drying: putting the CMC without the solvent into a drying room, drying for 1-3 hours at 60-80 ℃, and pulverizing to obtain the CMC with a novel structure.

2. The method for manufacturing sodium carboxymethyl cellulose with a novel structure according to claim 1, wherein the operation of step S2 is performed in an acidification room.

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