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Device for preparing polyhydroxyalkanoate fibers

A technology of polyhydroxyalkanoate and hydroxybutyric acid, which is applied in fiber treatment, single-component copolyester rayon, stretch spinning, etc. Sufficient and other issues

Inactive Publication Date: 2011-06-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method believes that too short crystallization time will lead to insufficient crystallization and cannot be stretched smoothly; too long crystallization time will lead to crystallization balance, and then cannot be stretched

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation of embodiment 1,3-hydroxybutyric acid-3-hydroxycaproic acid copolymer (PHBHHx) fiber

[0039] Take by weighing 20g PHBHHx (the weight average molecular weight Mw is 306000g / mol, and wherein, the mole percentage HHx% of 3-hydroxycaproic acid is 9.4%), put into the melting extruder after vacuum drying, be heated up to 120 ℃, extrude The output speed is 60cm / min, and the cylindrical spline is extruded to be the primary fiber; the primary fiber is crystallized in the air at 0°C for 24 hours to obtain the crystallized balanced fiber; then the crystallized balanced fiber is heat-treated at 100°C, Immediately after the heat treatment, take it out and place it at 10°C for stretching, the stretching speed is 50m / min, and the draw ratio is 15; the obtained oriented PHBHHx fiber with a draw ratio of 15 is subjected to tension heat setting at 20°C for 24h to obtain PHBHHx fibers have a diameter of 250um-300um and a breaking strength of 50MPa-100MPa.

Embodiment 2

[0040] The preparation of embodiment 2, 3-hydroxybutyric acid-3-hydroxycaproic acid copolymer (PHBHHx) fiber

[0041]Take by weighing 20g PHBHHx (the weight-average molecular weight Mw is 306000g / mol, wherein, the molar percentage HHx% of 3-hydroxycaproic acid is 9.4%), put into the melt extruder after vacuum drying, be heated up to 130 ℃, extrude The output speed is 120cm / min, and the cylindrical spline is extruded to form the as-spun fiber; the as-spun fiber is crystallized in the air at 10°C for 4 hours to obtain the crystallized balance fiber; then the crystallized balance fiber is heat-treated at 95°C, Immediately after heat treatment, take it out and place it at 20°C for stretching, the stretching speed is 100m / min, and the draw ratio is 15; the obtained oriented PHBHHx fiber with a draw ratio of 15 is subjected to tension heat setting at 45°C for 6h to obtain PHBHHx fibers have a diameter of 250um-300um and a breaking strength of 50MPa-100MPa.

Embodiment 3

[0042] The preparation of embodiment 3, 3-hydroxybutyric acid-3-hydroxycaproic acid copolymer (PHBHHx) fiber

[0043] Take by weighing 20g PHBHHx (the weight-average molecular weight Mw is 306000g / mol, wherein, the molar percentage HHx% of 3-hydroxycaproic acid is 9.4%), drop into in the melting extruder after vacuum-drying, be heated up to 140 ℃, extrude The output speed is 240cm / min, and the cylindrical spline is extruded to be the primary fiber; the primary fiber is crystallized in water at 15°C for 3 hours to obtain the crystallized balanced fiber; then the crystallized balanced fiber is placed at 90°C for heat treatment, heat treatment Take it out immediately and place it at 30°C for stretching, the stretching speed is 150m / min, and the draw ratio is 20; the obtained oriented PHBHHx fiber with a draw ratio of 20 is subjected to tension heat setting at 60°C for 1h to obtain PHBHHx The fiber has a diameter of 200um-250um and a breaking strength of 50MPa-150MPa.

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Abstract

The invention discloses a method for preparing polyhydroxyalkanoate fibers. The method comprises the following steps: (1) melting polyhydroxyalkanoates and extruding to obtain primary polyhydroxyalkanoate fibers; (2) crystallizing the primary polyhydroxyalkanoate fibers at 0 DEG C to 50 DEG C until reaching the balance of crystallization, and obtaining crystallization-balanced fibers; and (3) thermally treating the crystallization-balanced fibers and stretching; and thermally setting the shape of the crystallization-balanced fibers after stretching and obtaining the polyhydroxyalkanoate fibers. With the method, the crystallization-balanced fibers are treated thermally, so that the defect that the crystallization time is so long that the crystallization is balanced and direct stretching can not be conducted is solved. The breaking strength of polyhydroxyalkanoate fibers prepared with the method provided by the invention is 50-300MPa and the polyhydroxyalkanoate fibers have great tenacity.

Description

technical field [0001] The invention relates to a method for preparing fibers, in particular to a method for preparing polyhydroxyalkanoate fibers. Background technique [0002] Polyhydroxyalkanoate (Polyhydroxyalkanoate; PHA) is a kind of polyester that widely exists in bacteria, and mainly exists as a storage substance of carbon source and energy in cells. The earliest PHA discovered was a pro-Sudan dye and chloroform-soluble fat-like inclusion body found in Azotobacter chroococcum in the early twentieth century. Later, a similar inclusion body was found in Bacillus megaterium, and its composition was identified as Poly-D-3-hydroxybutyric acid (poly-D-3-hydroxybutyric acid or P(3HB)) (Microbiology Reviews. 1990, 54: 450-472). In the 1960s and 1970s, PHAs composed of other monomers began to be discovered. At the same time, the first generation PHA (PHB) and the second generation PHA (polyhydroxybutyrate hydroxyvalerate-Poly(hydroxybutyrate-co-valerate) or PHBV ) has reali...

Claims

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Application Information

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IPC IPC(8): D01D5/088D01D5/12D01D10/02D01F6/84
Inventor 吴琼任梦达丁长坤陈国强程博闻
Owner TSINGHUA UNIV
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