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Preparing method for electrostatic spinning lignin/cellulose acetate nanometer composite material

A technology of cellulose acetate and composite materials, which is applied in the preparation of spinning solution, cellulose/protein conjugated rayon, chemical characteristics of fibers, etc. and other problems, to achieve the effect of excellent adsorption performance

Inactive Publication Date: 2015-11-11
JIANGSU JINYU ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem mainly solved by the present invention: In view of the current situation that the lignin structure is complex, the filamentation property is not good, and the mechanical properties of the filaments are poor, which limits the application of lignin nanofibers, an electrospinning method is provided. A preparation method of lignin / cellulose acetate micro-nano composite material, the method uses barnyardgrass straw as raw material, removes lignin on the surface of the straw through pretreatment such as crushing and activation, and then uses acetic acid as solvent and acetic anhydride as acetylating agent , Sulfuric acid is used as a catalyst to acetylate barnyardgrass straw, and then extracted and separated by solvent to obtain cellulose acetate, which is mixed with lignin, acetic acid and tetrahydrofuran to make spinning solution, which is sprayed and solidified by high-voltage electrospinning device to finally obtain A kind of electrospun lignin / cellulose acetate micro-nano composite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Take barnyardgrass straw and expose it to the hot sun for 2 days, put it into a jet mill and crush it into small pieces of 1 cm, and then activate the straw fragments with a steam blaster to strip the lignin in the straw and tear the raw material into fine fibers; Take 200 mL of activated barnyardgrass stalks and put them into a 1000 mL beaker, add 200 mL of acetic acid and 300 mL of acetic anhydride, stir for 3 minutes at a speed of 100 r / min with a low-speed mixer, and then add 5 mL of sulfuric acid solution with a mass concentration of 80% as a catalyst , the temperature of the oil bath was raised to 110°C, placed on a magnetic stirrer and stirred for 2 hours at a stirring speed of 60r / min, and the barnyardgrass straw was acetylated; the above-mentioned acetylated mixture was poured into a horizontal high-speed centrifuge, and Centrifuge at a speed of 8000r / min for 15min to separate the supernatant, add 50mL of distilled water to the supernatant to produce a precipita...

example 2

[0029]Take barnyardgrass straw and expose it to the hot sun for 2 days, put it into a jet mill and crush it into small pieces of 2 cm, and then activate the straw fragments with a steam blaster to peel off the lignin in the straw and tear the raw material into fine fibers; Take 250g of the activated barnyardgrass stalks and put them into a 1000mL beaker, add 250mL of acetic acid and 350mL of acetic anhydride, stir with a low-speed mixer at a speed of 150r / min for 4min, then add 6mL of sulfuric acid solution with a mass concentration of 80% as a catalyst , heat up the oil bath to 120°C, put it on a magnetic stirrer to stir for 2 hours, and the stirring speed is 90r / min, and carry out acetylation treatment on barnyardgrass straw; pour the above acetylated mixed solution into a horizontal high-speed centrifuge, and Centrifuge at a speed of 9000r / min for 18min to separate the supernatant, add 80mL of distilled water to the supernatant to produce a precipitate, filter it with a Buch...

example 3

[0033] Take barnyardgrass straw and expose it to the hot sun for 3 days, put it into a jet mill and crush it into small pieces of 3 cm, and then activate the straw fragments with a steam blaster to peel off the lignin in the straw and tear the raw material into fine fibers; Take 300g of the above-mentioned activated barnyardgrass straw and put it into a 1000mL beaker, add 300mL of acetic acid and 400mL of acetic anhydride, stir with a low-speed mixer at a speed of 200r / min for 5min, then add 7mL of sulfuric acid solution with a mass concentration of 80% as a catalyst , heat up the oil bath to 130°C, put it on a magnetic stirrer to stir for 3 hours, and the stirring speed is 120r / min, and carry out acetylation treatment on barnyardgrass straw; pour the above acetylated mixed solution into a horizontal high-speed centrifuge, and Centrifuge at a speed of 11000r / min for 20min to separate the supernatant, add 100mL of distilled water to the supernatant to produce a precipitate, filt...

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Abstract

The invention relates to a preparing method for an electrostatic spinning lignin / cellulose acetate nanometer composite material and belongs to the field of adsorption material preparation. According to the method, barnyard grass straw is used as a raw material, pretreatment such as smashing and activating is carried out on the barnyard grass straw to remove lignin on the surface of the straw, acetic acid is used as solvent, acetic oxide is used as an acetylation agent, sulfuric acid is used as a catalyst for carrying out acetylation treatment on the barnyard grass straw, then solvent extraction is used for separation to obtain cellulose acetate, the cellulose acetate is mixed with the lignin, the acetic acid and tetrahydrofuran uniformly to prepare a spinning solution, and a high-voltage static spinning device carries out spinning and curing on the spinning solution to obtain the electrostatic spinning lignin / cellulose acetate nanometer composite material finally. Harmful plant barnyard grass is utilized as the raw material, waste is utilized, and the prepared composite material is excellent in adsorption performance, biodegradable and free from pollution to environment.

Description

technical field [0001] The invention relates to a method for preparing an electrospun lignin / cellulose acetate micro-nano composite material, which belongs to the field of adsorption material preparation. Background technique [0002] Barnyardgrass is an annual herbaceous plant, barnyardgrass and rice are very similar in appearance. Barnyardgrass grows in rice fields, swamps, ditches, and low-lying wastelands. The shape is like rice but the leaves are hairy and light in color. Barnyardgrass and rice absorb nutrients together, so barnyardgrass is a vicious weed in rice fields. Barnyard grass stems are rich in cellulose, and using barnyard grass as raw material to extract plant fiber is a good way to utilize its waste. [0003] Both cellulose and lignin are natural polymers with the highest reserves in the plant kingdom, and they have the characteristics of regeneration and good biodegradability. The lignin / cellulose nanofibers prepared by electrospinning should not only h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/02D01F8/18C08B3/06D01D1/02D04H1/4382D04H1/728
Inventor 李锦宇林大伟
Owner JIANGSU JINYU ENVIRONMENTAL ENG
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