CN115109278A - A kind of preparation method of cellulose diacetate particles - Google Patents

Abstract

The invention provides a preparation method of cellulose diacetate particles, which takes cellulose diacetate as a raw material and dissolves in a solvent, utilizes the polarity difference between the solvent and water, and obtains the cellulose diacetate particles through the principle of phase separation; The method is convenient and quick, the process is simple, and it is easy to enlarge, and the obtained cellulose diacetate particles are uniform in size, good in sphericity, high in strength, and good in compression resistance, and can be used as a filler to replace the existing plastic foam as a filler of fragile products.

Description

A kind of preparation method of cellulose diacetate particles

technical field

The invention relates to the field of cellulose diacetate materials, in particular to a method for preparing cellulose diacetate particles.

Background technique

Plastic foam is a common pollutant in modern society. It is difficult to degrade in nature, and a large amount of harmful substances will be produced by burning it. At present, the processing of new foam substitutes from natural biomass such as straw has received a lot of attention. However, the processing technology from natural biomass is often relatively complicated, which is not conducive to widespread use.

Cellulose diacetate is an important commercial derivative of natural cellulose. It is a high polymer formed by esterification of cellulose and acetate. It has important applications in the paper industry, textile industry and other fields. Cellulose diacetate is easily soluble in organic solvents, so it is easy to process. Cellulose diacetate tow has the characteristics of high strength, high toughness, non-flammability, and it can be degraded in the environment, which is an environment-friendly material.

The aerogel material prepared from cellulose diacetate has a light density, and maintains the characteristics of cellulose diacetate's strength, toughness, non-flammability, non-toxicity and harmlessness. Therefore, the substitute for preparing plastic foam from cellulose diacetate has the advantages of Broad prospects.

SUMMARY OF THE INVENTION

The present invention aims to provide a preparation method of cellulose diacetate particles. The method is very simple, does not need a granulator or similar equipment, and the prepared cellulose diacetate particles have good sphericity and excellent anti-compression performance, and can be used as a filler to replace existing foamed plastics.

The preparation method of the cellulose diacetate particles, comprising the following steps:

(1) Dissolving cellulose diacetate in N,N-dimethylformamide to obtain a cellulose diacetate solution;

(2) The solution obtained in step (1) is added dropwise to water with stirring, and cellulose diacetate particles are obtained by filtration.

Further, the concentration of the N,N-dimethylformamide solution of cellulose diacetate is 5%-10%, and the dissolving temperature is between 60-80°C.

Further, the volume of the solution added in step (2) is 0.1-0.2 times the volume of water, and the stirring speed is between 300-500 rpm.

The beneficial effects of the present invention are:

The invention utilizes the polarity difference between N,N-dimethylformamide and water to obtain cellulose diacetate particles by a phase separation method. The preparation method of the cellulose diacetate particles provided by the invention is very fast, and can be prepared without complicated equipment, and the particles prepared by the method have good toughness and compression resistance.

Description of drawings

FIG. 1 is a physical diagram of the cellulose diacetate particles obtained in Example 1 of the present invention.

Detailed ways

Example 1

Weigh 2 g of cellulose diacetate and dissolve it in 20 mL of N,N-dimethylformamide at 60 °C to form a transparent solution, add 10 mL of the above solution dropwise to 100 mL of deionized water, and stir at 500 rpm. Filtration to obtain cellulose diacetate particles.

Example 2

Weigh 10 g of cellulose diacetate and dissolve it in 100 mL of N,N-dimethylformamide at 60 °C to form a transparent solution. Take 100 mL of the above solution and add it dropwise to 800 mL of deionized water, stirring at 1000 rpm. Filtration to obtain cellulose diacetate particles.

Claims (3)

1. a preparation method of cellulose diacetate particle is characterized in that: the method comprises the following steps: (1) Dissolve cellulose diacetate in N,N-dimethylformamide to form a uniform solution, and stir it evenly; (2) The homogeneous solution obtained in step (1) is added dropwise to water and stirred to obtain cellulose diacetate particles. 2 . The method for preparing cellulose diacetate particles according to claim 1 , wherein the deacetylation degree of cellulose diacetate used in the step (1) is between 2.2 and 2.7, which is soluble in N , The concentration of N-dimethylformamide is between 5% and 10%. 3. The method for preparing cellulose diacetate particles according to claim 2, wherein the solution added in the step (2) is added dropwise, the volume is 0.1-0.2 times the volume of water, and the stirring speed is Between 300-500 rpm.

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