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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0038] Example 1. Preparation of 3-hydroxybutyric acid-3-hydroxyhexanoic acid copolymer (PHBHHx) fiber

[0039] Weigh 20g PHBHHx (weight-average molecular weight Mw is 306000g / mol, among which, the molar percentage of 3-hydroxycaproic acid HHx% is 9.4%), vacuum-dried and put it into the melt extruder, heat up to 120°C, extrude The output speed is 60cm / min, and the extruded cylindrical spline is the nascent fiber; the nascent fiber is crystallized in the air at 0°C for 24 hours to obtain the crystalline balance fiber; then the crystalline balance fiber is heat-treated at 100°C, Immediately after heat treatment, take it out and place it at 10°C for stretching at a stretching speed of 50m / min and a stretching ratio of 15; the oriented PHBHHx fiber with a stretching ratio of 15 is subjected to tension heat setting at 20°C for 24h. PHBHHx fiber has a diameter of 250um-300um and a breaking strength of 50MPa-100MPa.

Example Embodiment

[0040] Example 2. Preparation of 3-hydroxybutyric acid-3-hydroxyhexanoic acid copolymer (PHBHHx) fiber

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

Example Embodiment

[0042] Example 3 Preparation of 3-hydroxybutyric acid-3-hydroxyhexanoic acid copolymer (PHBHHx) fiber

[0043] Weigh 20g PHBHHx (weight-average molecular weight Mw is 306000g / mol, among which, the molar percentage of 3-hydroxycaproic acid HHx% is 9.4%), vacuum-dried and put it into the melt extruder, heat up to 140℃, extrude The output speed is 240cm / min, and the extruded cylindrical spline is the nascent fiber; the nascent fiber is crystallized in water at 15°C for 3h to obtain the crystalline balance fiber; then the crystalline balance fiber is heat treated at 90°C. Take it out immediately and place it at 30°C for stretching at a stretching speed of 150m / min and a stretching ratio of 20; the oriented PHBHHx fiber with a stretching ratio of 20 is subjected to tension heat setting at 60°C for 1 hour 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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