High-voltage static atomizing preparing technique for nano-grade cellulosic material

A technology of nano-scale cellulose and high-voltage electrostatic spraying, which is applied in fiber raw material processing, textiles and papermaking, etc., can solve the problems that nano-scale cellulose materials have not been reported, and achieve the effect of simple preparation method and strong operability

Inactive Publication Date: 2008-03-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of high-voltage electrostatic spray conditions to prepare nano-sized cellulose materials has not been reported so far

Method used

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  • High-voltage static atomizing preparing technique for nano-grade cellulosic material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] a. Put 2 parts of wood pulp cellulose (commercially available product) and 48 parts of ionic liquid AMIMCl in a flask, heat it in a constant temperature oil bath at 80°C, stir at high speed (600rpm), wait until the cellulose is dissolved, and become transparent amber To dilute the cellulose solution, 50 parts of dimethylformamide (DMF, Beijing Chemical Factory, analytical grade) were added to dilute the ionic liquid solution of cellulose. The process can be carried out under normal pressure. (AmimCl is 1-allyl-3-methylchloroimidazole, prepared by the method described in the literature "Acta Polymerica Sinica, 2003, 3:448-451" by Ren Qiang, and N-methylimidazole And allyl chloride into a three-necked flask, filled with N 2 Protect, heat to reflux in an oil bath at 60°C while stirring. Stop the reaction after 7 hours, use a rotary evaporator to evaporate excess allyl chloride, and cool to room temperature; use ether as the extractant, apply vigorous stirring, extract and remo...

Embodiment 2

[0028] a. Put 1 part of wood pulp cellulose (commercial product) and 99 parts of ionic liquid AMIMCl in a flask, heat in a constant temperature oil bath at 80°C, stir at high speed (600rpm) until the cellulose is dissolved and the system is transparent Amber solution. The process can be carried out under normal pressure.

[0029] b. Add the solution to a 10mL injection needle, use a 16# needle, control the voltage at 30kV, and a receiving distance of 15cm. Use aluminum foil for the receiving plate and acetone for the coagulation bath. After receiving, the system is a transparent and colorless suspension with nanofibers. The average diameter of the plain material is 800nm.

[0030] c. Use filtration and screening methods to separate the nano-cellulose material from the coagulation bath, and then recover the solvent. The electron microscope photo is shown in Figure 2.

Embodiment 3

[0032] a. Put 2 parts of wood pulp cellulose (commercial product) and 98 parts of ionic liquid AMIMCl in a flask, heat in a constant temperature oil bath at 80°C, and stir at high speed (600rpm) until the cellulose is dissolved and the system is transparent. Amber solution. DMF is added to dilute the ionic liquid solution of cellulose. The process can be carried out under normal pressure.

[0033] b. Add the solution to a 10mL injection needle, use a 16# needle, control the voltage at 30kV, and receive a distance of 15cm. Use aluminum foil for the receiving plate and water for the coagulation bath. After receiving, the system is a transparent and colorless suspension with nanofibers. The average diameter of the plain material is 200nm.

[0034] c. Use filtration and screening methods to separate the nano-cellulose material from the coagulation bath, and then recover the solvent. The electron microscope photo is shown in Figure 3.

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Abstract

The invention discloses a high-voltage electrostatic mist spray preparation method for nanometer-leveled cellulose materials, and belongs to the preparation field of organic function nanometer materials. Solve cellulose materials into a cellulose solvent as mass component shares before mixing at the speed of 500 to 2000 rpm; the solving temperature is 80 to 100 celsius degrees, and both the maxing and solving should be done with protection of nitrogen, so as to gain slurry with nanometer-leveled cellulose; add the prepared cellulose slurry into a propulsion pump, and place a receiving board at a distance of 10 to 20cm away from the propulsion pump; put the receiving board into a coagulating bath, and spray the cellulose slurry onto the receiving board with a 15 to 20kV high-voltage electrostatic method, so as to collect nanometer-leveled cellulose materials from the slurry before solvent collection is done. The overall preparation method has advantages of being simple and convenient, high opera operability, belonging to a physical process and having no pollution to environments.

Description

Technical field [0001] The invention relates to a high-voltage electrostatic spray preparation method of nano-grade cellulose materials, which belongs to the field of preparation of organic functional nano-materials. Background technique [0002] As petrochemical resources continue to decrease and people’s awareness of environmental protection increases, the demand for environmentally friendly, biodegradable materials is now rapidly increasing. Cellulose is the most abundant non-toxic and degradable natural polymer material in nature, and it is a kind of material with great development potential. Klemm D, Heublein B, etc. summarized and reported in the literature "Angew. Chem. Int. Ed., 2005, 44: 3358-3393". Now countries all over the world attach great importance to the development and research of cellulose materials. Nano-sized cellulose materials are currently an important direction in the research of cellulose functions. SamirMASA, Alloin F, etc. summarized and reported the u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00
Inventor 袁金颖隋晓锋袁伟忠周密
Owner TSINGHUA UNIV
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