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Cellulose diacetate pulp and preparing method thereof

A technology of cellulose diacetate and pulp, which is applied in the fields of cellulose pulp post-treatment, fiber raw material treatment, pulp property modification, etc., which can solve problems such as unfavorable actual production, achieve low cost, uniform structure, and easy control of moisture content Effect

Active Publication Date: 2019-04-16
上海展恒环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method also needs strong shear force treatment at the end, which is not conducive to actual production

Method used

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  • Cellulose diacetate pulp and preparing method thereof
  • Cellulose diacetate pulp and preparing method thereof

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Effect test

Embodiment 1

[0041] This embodiment provides a kind of preparation method of cellulose diacetate pulp, and specific preparation process is as follows figure 1 Shown:

[0042] (1) Completely dissolve cellulose diacetate with a relative molecular mass of 250,000 in acetone to prepare a uniform cellulose diacetate slurry with a concentration of 10 wt%. The temperature of the cellulose diacetate slurry is 60°C, and the delivery pressure is 5MPa Next, inject the slurry into the acetone coagulation bath after passing through the Venturi tube device to obtain the initial cellulose diacetate pulp; the water content in the coagulation bath is 80%;

[0043] (2) The initial cellulose diacetate pulp is washed repeatedly with a large amount of water to obtain the cellulose diacetate pulp, and the cellulose diacetate can be further washed, centrifuged and vacuum-dried to obtain a finished product. The obtained cellulose diacetate pulp has a large specific surface area and a uniform structure.

[0044]...

Embodiment 2

[0046] This embodiment provides a kind of preparation method of cellulose diacetate pulp

[0047] (1) The cellulose diacetate that relative molecular weight is 400000 is dissolved completely in dimethylacetamide, is mixed with concentration and is the cellulose diacetate slurry that is uniform of 7wt%, and the temperature of cellulose diacetate slurry is 50 ℃, in Under the delivery pressure of 5MPa, inject the slurry into dimethylacetamide after passing through the Venturi device to obtain the initial cellulose diacetate pulp; the water content in the coagulation bath is 90%;

[0048] (2) The initial cellulose diacetate pulp is washed repeatedly with a large amount of water to obtain the cellulose diacetate pulp, and the cellulose diacetate can be further washed, centrifuged and vacuum-dried to obtain a finished product.

[0049] Among them, the solvent can be recovered in the Venturi tube device.

Embodiment 3

[0051] This embodiment provides a kind of preparation method of cellulose diacetate pulp

[0052] (1) Completely dissolve cellulose diacetate with a relative molecular mass of 700,000 in a mixed solvent of dimethylacetamide and dimethyl sulfoxide (the mass ratio of the two is 1:1), and prepare a uniform concentration of 5 wt%. The cellulose diacetate slurry, the temperature of the cellulose diacetate slurry is 65 ℃, and under the delivery pressure of 0.1MPa, the slurry is injected into the coagulation bath of dimethylacetamide and dimethyl sulfoxide after passing through the Venturi tube device, The initial cellulose diacetate pulp is obtained; the water content in the coagulation bath is 95%;

[0053] (2) The initial cellulose diacetate pulp is washed repeatedly with a large amount of water to obtain the cellulose diacetate pulp, and the cellulose diacetate can be further washed, centrifuged and vacuum-dried to obtain a finished product.

[0054] Among them, the solvent can ...

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Abstract

The invention provides cellulose diacetate pulp and a preparing method thereof. The preparing method comprises the following steps that 1, cellulose diacetate is dissolved in a solvent to form cellulose diacetate seriflux, the cellulose diacetate seriflux passes through a Venturi tube device and is injected into coagulating bath, and thus initial cellulose diacetate pulp is obtained; 2, the initial cellulose diacetate pulp is processed with water, and thus the cellulose diacetate pulp is obtained. The preparing method omits the steps such as spinning, cutting, pulping and shearing, the preparing technology is easy, compared with a conventional high polymer pulp preparing method, the prepared cellulose diacetate pulp is easy to store, the water content is easy to control, multiple components of the pulp can be mixed, operation is more convenient and easier, the cost is lower, the diameter of the finally obtained cellulose diacetate pulp becomes smaller, and the cellulose diacetate pulpis large in specific area and uniform in structure and has high practical application value.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a cellulose diacetate pulp and a preparation method thereof. Background technique [0002] High polymer pulp is a new type of differentiated and functional product of high polymer fiber. At present, the reported high polymer chemical fiber pulp mainly includes aramid pulp, polyacrylonitrile pulp, polyester pulp, etc. Cellulose diacetate (Cellulosediacetate) is the material inside the filter tip of cigarettes. No articles and related patents on the preparation of cellulose diacetate pulp have been found. The preparation methods of other chemical fiber pulp are listed as follows: [0003] USP5296286 proposed a jet spinning method to prepare polyacrylonitrile pulp, that is, the spinning stock solution of polyacrylonitrile was extruded through a long slit-shaped die, and stretched by a nozzle-type high-speed airflow device. Or there is a high-speed airflow nozzle around the slit-shape...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C9/00
CPCD21C9/002
Inventor 张秀芳赵付平陈越成
Owner 上海展恒环保科技有限公司
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