Polyhydroxyalkanoate fibers, preparing method and application thereof

A technology of polyhydroxyalkanoate and hydroxycaproic acid copolyester, which is applied in the field of polyhydroxyalkanoate fiber, its preparation and its application, can solve the problems of thick fiber diameter and long crystallization time, so as to increase the crystallization speed and reduce the Production cost, high strength effect

Active Publication Date: 2016-05-25
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method still has the problems of longer crystallization time and thicker fiber diameter

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0034] The preparation method of polyhydroxyalkanoate fiber of the present invention, comprises the steps:

[0035] (1) uniformly dispersing the carbon nanotubes in the polyhydroxyalkanoate matrix to obtain a polyhydroxyalkanoate-carbon nanotube composite material;

[0036] (2) vacuum-drying the polyhydroxyalkanoate-carbon nanotube composite material, and melt extruding to obtain nascent fibers;

[0037](3) crystallize the as-spun fibers at 4°C to 45°C, and then perform stretching and tension heat setting to obtain the polyhydroxyalkanoate fibers; wherein, the crystallization time of step (3) is 1 to 60 minutes .

[0038] In step (1) of the present invention, the polyhydroxyalkanoate-carbon nanotube composite material contains 0.05wt% to 2wt%, preferably 0.1wt% to 1wt%, more preferably 0.5wt% to 1wt% of carbon nanotubes Tube. The outer diameter of the carbon nanotubes of the present invention may be 1 to 60 nm, preferably 30 to 50 nm. The carbon nanotubes of the present in...

preparation example 1

[0055] 3-Hydroxybutanoic acid copolyester with 3-hydroxyhexanoic acid (PHBHHx) was prepared by the method of fermentation C described in: "Appl. .Biotechnol., volume 57, pages 50-55, 2001). The detailed preparation steps are as follows:

[0056] The strain selected for the experiment was A.hydrophila4AK4. Cells were grown in LB medium (Luria-Bertani) and stored in slants in the refrigerator for two weeks. The seed medium used for fermentation was prepared in a 1L Erlenmeyer flask containing 400ml of LB medium at a temperature of 30°C for 12h. Transfer the seed medium to a 4000L fermenter containing 2000L glucose yeast extract medium, grow at 30°C for 12h until the logarithmic phase, the stirring rate is 250rpm, and the ventilation rate is 20000L / h. Among them, 1L glucose yeast extraction medium contains: 16 grams of glucose, 1.5 grams of KH 2 PO 4 , 1 gram (NH 4 ) 2 SO 4 , 4.5 g Na 2 HPO 4 , 0.2 g MgSO 4 ·7H 2 O, 0.05 g CaCl 2 2H 2 O, 0.5 g yeast extract and 1 ml ...

Embodiment 1

[0058] Mix PHBHHx and CNT evenly to obtain PHBHHx-CNT composite material (PHBHHx weight average molecular weight Mw is 306000g / mol, wherein, the molar percentage of 3HHx is 9.4%, and the mass fraction of CNT is 0.1%). Put 20g of PHBHHx-CNT composite material into a melt extruder after vacuum drying, heat up to 120°C, extrude at a speed of 60cm / min, and extrude cylindrical splines to form primary fibers; place the primary fibers at 4°C in ice Carry out crystallization in water for 60 minutes, then stretch at 20°C, the stretching speed is 300m / min, and the draw ratio is 20; the obtained oriented PHBHHx-CNT fibers with a draw ratio of 20 are subjected to tension heat setting at 30°C After 60 minutes, PHBHHx-CNT fibers were obtained with a diameter of 80 μm and a tensile strength of 250 MPa.

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Abstract

The invention discloses polyhydroxyalkanoate fibers, a preparing method and application thereof. The polyhydroxyalkanoate fibers contain 0.05-2 wt% of carbon nano tubes, and polyhydroxyalkanoate is copolyester of 3-hydroxybutyric acid and 3-hydroxy caproic acid. The carbon nano tubes are added into polyhydroxyalkanoate PHBHHx, it is accidentally found that the crystallization velocity of polyhydroxyalkanoate is greatly increased by the carbon nano tubes, the crystallization time in the spinning and forming process is shortened, the spinning and forming efficiency is improved, and then production cost is reduced. The fibers are suitable for serving as absorbable suture lines.

Description

technical field [0001] The invention relates to a biodegradable fiber, a preparation method and its use, in particular to a polyhydroxyalkanoate fiber, a preparation method and its use. Background technique [0002] Polyhydroxyalkanoate (PHA) is a kind of intracellular biological polyester synthesized by bacteria, which mainly exists as a storage material of carbon source and energy in organisms. Polyhydroxyalkanoate has excellent biocompatibility and biodegradability, and is one of the most active research hotspots in the field of biopolymer materials. At present, the first generation of PHA - poly 3-hydroxybutyrate (PHB), the second generation of PHA - 3-hydroxybutyric acid-3-hydroxyvaleric acid copolyester (PHBV) and the third generation of PHA - 3 -Hydroxybutyric acid-3-hydroxyhexanoic acid copolyester (PHBHHx) materials have been industrialized. However, since the PHA material is derived from bacterial cells, there is no catalyst residue and high purity; this results ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/92D01F1/10D01D5/08D01D5/12D01D10/02A61K47/34A61L17/10A61L29/06
CPCA61K47/34A61L17/105A61L29/06D01D5/08D01D5/12D01D10/02D01F1/10D01F6/92C08L67/04
Inventor 丁长坤程博闻张晗吴琼刘亚陈国强
Owner TIANJIN POLYTECHNIC UNIV
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