Method for preparing regenerated cellulose composite membrane by crop straws

A technology for regenerating cellulose and crop straw, which is applied in the fields of comprehensive utilization of agricultural waste and green chemical biological products, can solve the problems of complex production process, poor hydrophobicity and high economic cost, and achieves simple and convenient operation, good solubility, wide The effect of the application foreground

Active Publication Date: 2013-09-25
JIAHE BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cellulose film products represented by cellophane have been widely favored by the market because of their similar physical properties to plastic films, but the products have poor hydrophobic properties, complex production processes, and high economic costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing a regenerated cellulose composite film from crop stalks, using corn stalks as raw materials, comprising the following steps:

[0025] 1) After the corn stalks are sheared and dedusted, they are treated with microbial fermentation at 50°C for 48 hours, extruded and coarsely ground, then cooked in 0.3% sodium hydroxide solution at 115°C for 3 hours, and then decomposed and Obtain corn stalk natural color paste after desanding;

[0026] 2) Take 4g of absolute dry natural color paste from corn stalks, disperse it in 25ml of 15wt% NaOH aqueous solution at 5°C, and stir well. Then add 25ml10wt% urea solution, keep the above temperature, obtain a uniform and stable cellulose solution after magnetic stirring is sufficient;

[0027] 3) Mix another 2g of polyvinyl alcohol with 25ml of water, stir at 90°C until completely dissolved, then mix the cellulose solution obtained in step 2) with it and stir evenly, cool to room temperature, cast on a flat plate an...

Embodiment 2

[0029] A method for preparing a regenerated cellulose composite film from crop stalks, using wheat stalks as raw materials, comprising the following steps:

[0030] 1) After shearing and dedusting, the wheat straw is treated with microbial fermentation at 60°C for 48 hours, extruded and coarsely ground, then cooked in 0.4% sodium hydroxide solution at 125°C for 2.5 hours, and then decomposed and After desanding, the natural color paste of wheat straw is obtained;

[0031] 2) Take 1.5g of wheat straw natural color absolute dry pulp, stir well with 25ml of 15wt% NaOH aqueous solution at 0°C, then add 25ml of 20wt% urea solution, and stir magnetically for 30 minutes to obtain a milky white uniform cellulose solution;

[0032] 3) After heating the cellulose solution obtained in step 2) to 80°C, directly add 1.5g of polyvinyl alcohol, continue stirring at this temperature for 1 hour to completely dissolve and mix, cool to room temperature, and cast on a glass plate for 2 hours Aft...

Embodiment 3

[0034] A method for preparing a regenerated cellulose composite film from crop stalks, using wheat stalks as raw materials, comprising the following steps:

[0035] 1) After shearing and dedusting, the wheat straw is treated with microbial fermentation at 40°C for 48 hours, extruded and coarsely ground, then cooked in 0.5% sodium hydroxide solution at 130°C for 2 hours, and then decomposed and After desanding, the natural color paste of wheat straw is obtained;

[0036] 2) Take 1.5g of natural color dry pulp of wheat straw, stir well with 10ml of 5wt% NaOH aqueous solution at -5°C, then add 15ml of 5wt% urea solution, and stir magnetically for 30 minutes to obtain a milky white uniform cellulose solution;

[0037] 3) After heating the cellulose solution obtained in step 2) to 80°C, add 0.3g of polyvinyl alcohol directly, continue to stir at this temperature for 1 hour to completely dissolve and mix, cool to room temperature, and cast on a glass plate for 2 hours After that, t...

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PUM

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Abstract

The invention discloses a method for preparing a regenerated cellulose composite membrane by crop straws. The method comprises the following steps of: 1) extracting and refining crop straw cellulose, thus obtaining high-purity straw cellulose slurry; 2) dissolving and regenerating the straw cellulose, namely dispersing the slurry into 5-20 wt percent of NaOH aqueous solution, fully and uniformly stirring the slurry and the solution under the condition of-5-10 DEG C, then adding 5-30 wt percent of urea solution into the mixture, continuously stirring the mixture at the temperature of (-5)-10 DEG C to obtain a homogeneous cellulose solution; and 3) preparing a mixed solution by the cellulose solution and polyvinyl alcohol, and preparing the regenerated cellulose composite membrane by the mixed solution by a tape casting method. According to the method, the crop straws are used as raw materials, and the sodium hydroxide / urea solution is used as a solvent, so that the cost is low, the operation is simple and convenient, the technology is pollution-free, and waste liquid can be used for production fertilizers. The regenerated cellulose composite membrane prepared by the method is high in mechanical property and biodegradability.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of agricultural waste and green chemical biological products. The invention relates to the use of crop stalks as the main raw material to prepare a cellulose film through a green dissolving cellulose process, and the product also has good biodegradable properties. Background technique [0002] Plant cellulose is the oldest natural polymer and the most abundant renewable resource on the earth, and it is an environmentally friendly material. my country is a large agricultural country with abundant agricultural straw resources, and the current annual output is more than 800 million tons. If it is fully and effectively used, it can not only reduce greenhouse gas emissions and protect the environment, but also alleviate the energy crisis caused by the decreasing petrochemical resources. The cellulose content in straw raw materials is the most abundant, and the efficient dissolution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L1/02C08L29/04
Inventor 任宪君李强王春燕张淑娟安良梅范自龙
Owner JIAHE BIOTECH
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