A method for extracting cellulose nano whiskers from corn bracts

A corn husk and nano-whisker technology, which is applied in the field of textile materials, can solve the problems of low cellulose content, difficulty in extracting cellulose nano-whiskers, low crystallinity and the like, and achieves simple preparation process, small length, and uniformity of diameter. high effect

Inactive Publication Date: 2017-01-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a preparation method of corn bract cellulose nano-whiskers, solve the problem that corn bracts are difficult to extract cellulose nano-whiskers due to low cellulose content and low crystallinity, and develop high-quality corn bracts. Added value application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of corn bract cellulose nano whiskers, the specific steps are:

[0028] Step 1: Pretreatment: Wash the corn bracts with tap water and dry them in a vacuum oven at 60°C to constant weight, and place them in 100g / L H 2 SO 4 In the solution, the bath ratio is 1:30, after soaking for 36 hours, take it out and wash it, and dry it in a vacuum oven at 60°C to constant weight;

[0029] The second step: biochemical treatment: the pretreated corn bracts are placed in a laccase solution for treatment, the amount of laccase is 1% of the dry weight of the corn bracts, and the pH of the solution is 1% H 2 SO 4 adjusted to 5.0, the bath ratio was 1:30, the temperature was 60°C, and the time was 1h. After the treatment, it was taken out, washed and dried in a vacuum oven at 60°C to constant weight; then placed in an alkaline solvent system for treatment, bath The ratio is 1:20, the temperature is 95°C, and the time is 2h. After the treatment, take it out and was...

Embodiment 2

[0038] A preparation method of corn bract cellulose nano whiskers, the specific steps are:

[0039] Step 1: Pretreatment: Wash the corn bracts with tap water and dry them in a vacuum oven at 60°C to constant weight, and place them in 200g / L H 2 SO 4 In the solution, the bath ratio is 1:20, after soaking for 24 hours, take it out and wash it, and dry it in a vacuum oven at 60°C to constant weight;

[0040] The second step: biochemical treatment: the pretreated corn bracts are placed in a xylanase solution for processing, and the xylanase dosage is 0.5% of the dry weight of the corn bracts, and the pH value of the solution is adjusted to 8.5, the bath ratio is 1:20, the temperature is 60°C, and the time is 1h. After the treatment, take it out, wash it, and dry it in a vacuum oven at 60°C to constant weight; then place it in an alkaline solvent system for treatment, and the bath ratio is 1:30, the temperature is 90°C, and the time is 2.5h. After the treatment, take it out and w...

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Abstract

The invention provides a method for preparing cellulose nanowhiskers from corn husks. The method is characterized by comprising the following specific steps: performing pretreatment, biochemical treatment, mechanical crushing, DMSO (dimethyl sulfoxide) treatment and TEMPO (tetramethylpiperidinooxy) oxidation treatment, putting an obtained mixture into a stirrer, and stirring to obtain a corn husk fiber powder suspension; performing centrifugation treatment to obtain a corn husk fiber precipitate; performing dispersion treatment to obtain a corn husk cellulose nanowhisker suspension; and performing freeze-drying to obtain the corn husk cellulose nanowhiskers. The method provided by the invention has the advantages of simple preparation process, high yield, low energy consumption, no emission of toxic and harmful substances in the production process and large-scale popularization and application potential; and the used corn husks are rich in resources and low in cost, the problem of environmental pollution is solved, and the added value of the corn husks is also improved.

Description

technical field [0001] The invention relates to a method for extracting cellulose nano-whiskers from corn bracts, and belongs to the technical field of textile materials. Background technique [0002] my country is a large agricultural country, and its corn production ranks third in the world, and a large amount of straw and bracts are produced every year. Corn stalks can be used to extract cellulose, animal feed or fuel, etc.; the utilization rate of bracts is much smaller than that of straw, and it is often used for animal feed, carpet weaving or direct burning, and it has also been reported that it can be woven into small ropes for Bundle objects. Among them, the added value for weaving carpets is relatively high. The main method is to select mid-stubble or late-stubble corn bracts, smoke and dye them, cut them into strips with a width of about 1 cm, and weave them into carpets. The main components of corn bracts are cellulose, hemicellulose, lignin, water-soluble subst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/00
CPCD21C5/00D21C5/005
Inventor 刘丽芳王晓婷李莉赵艳娇刘慧俞子俊
Owner DONGHUA UNIV
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