Method for preparing cellulose composite membrane by utilizing rice straw

A rice straw and cellulose technology, which is applied in fiber raw material processing, textiles and papermaking, etc., can solve the problems of composite membrane performance that need to be improved, achieve good market prospects, reduce pollution, and reduce porosity

Inactive Publication Date: 2018-04-06
柳州市柳科科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of traditional lye and urea aqueous solution to dissolve cellulose produces a large amount of waste water, which puts a certain pressure on the environment.
And the performance of the composite membrane also needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for preparing a cellulose composite film using rice straw, comprising the following steps:

[0039] S1. Straw pretreatment:

[0040] Clean and chop the rice stalks into short stems with a length of 2 to 5 cm, and then add them to an aqueous ethanol solution for pretreatment for 2 hours at a treatment temperature of 180° C., and then dry them.

[0041] The bath ratio of the pretreatment process is 1:8. The ethanol concentration in the ethanol aqueous solution is 50%.

[0042] S2. Cellulose dissolution:

[0043] Melt the 1-allyl-3-methylimidazolium chloride salt ionic liquid completely at 90°C, then add the pretreated rice straw, the bath ratio is 1:8, continue to heat and keep warm to dissolve, the time for keep warm to dissolve For 6h, the temperature is 95°C. Finally, the undissolved rice straw was removed by centrifugation to obtain a cellulose ionic liquid solution.

[0044] S3. Mixed solution preparation:

[0045] Add polyvinyl alcohol, cornstarch and...

Embodiment 2

[0049] The invention discloses a method for preparing a cellulose composite film by using rice straws. During the straw pretreatment process, the ethanol concentration of the ethanol aqueous solution is 55%. Other steps are with embodiment 1.

Embodiment 3

[0051] The invention discloses a method for preparing a cellulose composite film by using rice straws. During the straw pretreatment process, the ethanol concentration of the ethanol aqueous solution is 60%. Other steps are with embodiment 1.

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PUM

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Abstract

The invention provides a method for preparing a cellulose composite membrane by utilizing rice straw, which relates to the field of the utilization of crop straw. The method comprises the following steps: pre-treating the straw, dissolving cellulose, preparing a mixed solution, and molding. Specifically, the method comprises the following steps: pre-treating the straw in an ethanol aqueous solution, and drying; then melting 1-allyl-3-methylimidazolium chloride ion liquid, adding the pre-treated rice straw, continuously heating, preserving the heat, dissolving, and obtaining a cellulose ion liquid solution; and finally adding polyvinyl alcohol, corn starch and glycerinum, mixing to obtain a mixed solution, smearing the mixed solution by using a smearing machine to form a membrane, and drying to obtain the cellulose membrane. The ethanol aqueous solution is firstly used for pre-treating the rice straw, then the ion liquid is adopted to dissolve the cellulose, the corn starch, the polyvinyl alcohol and the glycerinum are added, and finally the mixture are molded to obtain the cellulose composite membrane. The entire process is free from emission of pollutants, the environmental pollution can be avoided, the utilization rate of the cellulose is relatively high, and the prepared composite membrane has good mechanical properties.

Description

technical field [0001] The invention relates to the field of crop straw utilization, in particular to a method for preparing a cellulose composite film by using rice straw. Background technique [0002] my country is a major rice producing country, and a large amount of rice straw is produced every year. Most of the rice straw is discarded and burned at will, causing great environmental pollution, affecting the quality of life of farmers, and causing a great waste of resources. How to solve the environmental problems caused by random discarding and burning of rice stalks in rural areas and improve the quality of life of farmers has become an important issue in the construction of new countryside. [0003] The cellulose content in rice straw accounts for about 30-50% of the dry weight of rice straw. Straw cellulose extracted from rice straw is a natural raw material for the production of clean energy and fine chemicals. To develop a method of using rice straw as a raw materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08J3/09C08L1/02C08L29/04C08L3/02C08K5/053D21C5/00
CPCC08J3/096C08J5/18C08J2301/02C08J2403/02C08J2429/04C08K5/053D21C5/00
Inventor 李文
Owner 柳州市柳科科技有限公司
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