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Method for preparing polylactic acid nano fiber

A technology of nanofibers and polylactic acid, which is applied in the fields of fiber chemical characteristics, dry spinning method, and final product manufacturing. It can solve problems such as unevenness, thick polylactic acid fibers, and slow speed, and achieve the effect of simple process and few processes.

Inactive Publication Date: 2009-03-18
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The existing preparation method of polylactic acid fiber is relatively slow, and the prepared polylactic acid fiber is thick and uneven

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The weight-average molecular weight of the polylactic acid pellets used was 20,000. (1) The polylactic acid pellets were vacuum-dried at 30°C for 24 hours, and the vacuum degree was 100Pa; (2) Weighed 1.01g of polylactic acid, dissolved in 50mL of chloroform, and magnetically stirred until completely dissolved; (3) Use For a spray dryer with an organic solvent recovery device, after starting the instrument, when the temperature of the nitrogen gas flow reaches 120°C, start the peristaltic pump and adjust the flow rate of the peristaltic pump to 29mL / h. The nozzle aperture of the spray dryer is 0.7mm, and the gas flow rate The elevation of the flowmeter is 30mm; (4) The PLA nanofibers formed during the spray drying process gather at the bottom of the collector, and after collection, freeze at -60°C for 24h, and then dry in a freeze dryer for 6h at a temperature of -80°C under vacuum (5) Scanning electron microscope (XL-30, Philips) measured the fiber diameter to be 100-2...

Embodiment 2

[0026] The weight-average molecular weight of the polylactic acid pellets used was 20,000. (1) The polylactic acid pellets were vacuum-dried at 30°C for 24 hours, and the vacuum degree was 100Pa; (2) Weighed 1.05g of polylactic acid, dissolved in 50mL of chloroform, and magnetically stirred until completely dissolved; (3) Use For a spray dryer with an organic solvent recovery device, after starting the instrument, when the temperature of the nitrogen gas flow reaches 120°C, start the peristaltic pump and adjust the flow rate of the peristaltic pump to 25mL / h. The nozzle aperture of the spray dryer is 0.7mm, and the gas flow rate The elevation of the flowmeter is 30mm; (4) The PLA nanofibers formed during the spray drying process are gathered at the bottom of the collector, and after collection, they are frozen at -60°C for 36h, and then dried in a freeze dryer for 6h at a temperature of -80°C under vacuum. (5) Scanning electron microscope (XL-30, Philips) measured the fiber di...

Embodiment 3

[0028] The weight-average molecular weight of the polylactic acid pellets used was 40,000. (1) The polylactic acid pellets were vacuum-dried at 50°C for 24 hours, and the vacuum degree was 100Pa; (2) Weighed 2.06g of polylactic acid, dissolved in 150mL of chloroform, and magnetically stirred until completely dissolved; (3) Use For a spray dryer with an organic solvent recovery device, after starting the instrument, when the temperature of the nitrogen gas flow reaches 130°C, start the peristaltic pump and adjust the flow rate of the peristaltic pump to 35mL / h. The nozzle aperture of the spray dryer is 0.7mm, and the gas flow rate The elevation of the flowmeter is 28mm; (4) PLA nanofibers formed during the spray-drying process are gathered at the bottom of the collector, and after collection, they are frozen at -60°C for 48h, and then dried in a freeze dryer for 6h at a temperature of -60°C under vacuum. (5) Scanning electron microscope (XL-30, Philips) measured the diameter of...

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Abstract

The present invention discloses a method for preparing a polylactic acid nanometer fiber, which comprises the following steps that firstly, a polylactic acid grain material is subject to vacuum drying, and the polylactic acid is levogyrate polylactic acid; secondly, the polylactic acid is dissolved in a solvent, the mass / volume ratio of the polylatic acid and the solvent is between 0.85 and 5 g / 100ml, and the solvent is chloroform or acetone; thirdly, a spray drying device with an organic solvent recovery device is used for spraying the polylactic acid solution through peristaltic pump, the sprayed solution meets a thermal current, the solvent is volatilized, and the polylactic acid nanometer fiber is formed; fourthly, the nanometer fiber is refrigerated and lyophilized. The obtained nanometer fiber is cotton wool shaped, the diameter is between 100 and 200 nm, and the dimension of the fiber is fine and uniform. The preparation method is simple in process and less in working procedures. The solvent can be recycled, and thus the method has no hazard to environment.

Description

technical field [0001] The invention relates to a preparation method of polylactic acid fibers, in particular to a method for preparing polylactic acid nanofibers through a spray drying technique. Background technique [0002] Polylactic acid (PLA) is a biodegradable polymer material with excellent mechanical properties, and the degraded product is CO 2 And water, no damage to human body and environment. As a kind of biodegradable fiber, polylactic acid fiber can be used for research on drug excretion by utilizing the biodegradable characteristics of biodegradable fiber in the human body. Biodegradable hollow fiber fabrics are being studied as medical materials such as cell culture. Porous scaffolds made of biodegradable nanofibers can be used as carriers for tissue engineered organ repair. At the same time, as a fiber material, polylactic acid can also be used as a reinforcing agent to compound with other materials to improve the mechanical properties of the material suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/62D01F13/04D01D5/04
CPCY02P70/62
Inventor 李红赵澎周长忍
Owner JINAN UNIVERSITY