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Poly (hydroxybutyrate-hydroxyvalerate) fiber and dry spinning method

A polyhydroxybutyric acid valeric acid copolyester, dry spinning technology, applied in the direction of single-component copolyester rayon, dry spinning, fiber processing, etc. Material degradation, impact strength, etc.

Inactive Publication Date: 2009-07-08
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat resistance of PHB and PHBV is relatively poor, and they will be degraded when they are melted, and the melt-extruded material will gradually change from elastic body to plastic body and finally to brittle body with the increase of storage time.
In the melt spinning process, in addition to the above problems, there are also problems such as the adhesion between the primary fibers and the inability to unwind, the decomposition of the polymer severely affects the strength, the rapid brittleness of the primary fibers, and the winding cannot be achieved through a simple method—drawing Two-step processing and other issues
At present, Japanese scientists Tanaka et al. are active in this research. They have realized PHBV melt spinning with very complex processes and equipment, and obtained better strength (Toshihisa Tanaka et al, macromolecules, 2006, 39: 2940- 2946), but still cannot solve the degradation of the material during the melting process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In order to obtain a solid fiber with a monofilament fineness of 1dtex, a breaking strength of 500MPa, a breaking elongation of 30%, and a polygonal petal-shaped cross section, the following methods can be used:

[0032] Put 1kg of PHBV powder with a weight average molecular weight of 100,000, a molecular weight distribution of 5, and a HV molar content of 50%, and 9kg of glacial acetic acid as a solvent, into a dissolution kettle, heat to 80°C, condense and reflux, and stir at a speed of 250rad / min 1 hour, pressurized filtration, and degassing at normal pressure for 0.5 hours to obtain a uniform spinning stock solution.

[0033] The stock solution temperature is 80°C, and the as-spun silk is obtained through dry spinning. The as-spun silk was equilibrated in air at 25°C and humidity 60% for 2 hours, and the as-spun fiber was drawn 3 times at 35°C by heating in a water bath, and then tensioned and heat-set at 100°C and 100MPa tension for 20 seconds.

Embodiment 2

[0035] In order to obtain a solid fiber with a monofilament fineness of 30dtex, a breaking strength of 5GPa, a breaking elongation of 10%, and a circular cross-section, the following methods can be used:

[0036] Pour 1 kg of PHBV powder with a weight average molecular weight of 3 million, a molecular weight distribution of 2, and a HV molar content of 0%, and 2 kg of chloroform as a solvent, into a dissolution kettle, heat to 80 ° C, condense and reflux, and use a speed of 250 rad / min Stir for 3 hours, filter under pressure and defoam under normal pressure for 6 hours to obtain a uniform spinning stock solution.

[0037] The stock solution temperature is 55°C, and the as-spun silk is obtained through dry spinning. The as-spun silk was equilibrated in air at 25°C with a humidity of 60% for 0.5 hours. The as-spun fiber was drawn 15 times in two steps at 80°C by heating with a water bath, and then heat-set under tension at 130°C and 1 GPa tension for 1 minute.

Embodiment 3

[0039]In order to obtain a solid fiber with a monofilament fineness of 10dtex, a breaking strength of 2GPa, a breaking elongation of 30%, and a dog-bone cross-section, the following methods can be used:

[0040] Put 1 kg of PHBV powder with a weight average molecular weight of 500,000, a molecular weight distribution of 3.5, and a HV molar content of 95%, and 4 kg of chloroform as a solvent, into a dissolution kettle, heat to 70 ° C, condense and reflux, and use a speed of 250 rad / min Stir for 2 hours, filter under pressure and defoam under normal pressure for 6 hours to obtain a uniform spinning stock solution.

[0041] The temperature of the stock solution is 35° C., and the as-spun silk is obtained through dry spinning. The as-spun silk was equilibrated in air at 25°C and 60% humidity for 1 hour, and the as-spun fiber was drawn 8 times at 80°C by heating in a water bath, and then heat-set under tension at 100°C and 300MPa tension for 30 seconds.

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Abstract

The invention discloses a polyhydroxy butanoic acid valeric acid copolyesters fibre and a dry spinning method. The dry spinning method includes steps as follows: mixing dissolving the polyhydroxy butanoic acid valeric acid copolyesters , solvent and additive in 30-140 DEG. C for obtaining spinning stock solution, wherein, 100 parts polyhydroxy butanoic acid valeric acid copolyesters by weight, 200-900 parts solvent by weight, 0-20 parts additive by weight, then spinning by using the dry spinning method for obtaining polyhydroxy butanoic acid valeric acid copolyesters fibre. The method provided by the invention has low temperature in whole spinning process that solves decrease of molecular weight caused by melting spinning, initial fiber does not twined each other in winding benefit to unreel in post processing without complex one step forming of equipment and obtained fiber has high strength.

Description

technical field [0001] The invention relates to a polyhydroxybutyrate copolyester fiber and a preparation method thereof. Background technique [0002] In 1925, the document Lemoigne M., The Identification of Poly(3-hydroxybutyrate)[J]. Ann.Inst.Pasteur, 1925, 39: 144. reported that Lemoigne first discovered polyhydroxybutyrate in the bacteria Alcaligenes eutrophus, Abbreviated as PHB. Later, people discovered the existence of its copolymer polyhydroxybutyrate copolyester, English name poly(β-hydroxybutyrate-co-β-hydroxyvalerate), (abbreviated as PHBV). Later, it was discovered that such substances also exist in various bacteria, and the proportion of this substance in some cells can be as high as 90%. PHBV has many advantages, so it has received special attention in the field of biodegradable polymers. First of all, PHBV has a wide range of sources. Gram-positive bacteria, Gram-negative bacteria, aerobic bacteria, and photosynthetic bacteria have all been found to be abl...

Claims

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Application Information

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IPC IPC(8): D01D1/02D01D5/04D01D5/24D01D5/253D01F6/84D01F1/10
Inventor 陈彦模朱美芳朱树琦张瑜俞昊孙芳华
Owner DONGHUA UNIV
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