CN102146598B - PHBV-containing biobased chemical fiber and preparation method thereof - Google Patents
PHBV-containing biobased chemical fiber and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a polyhydroxybutyrate valerate (PHBV)-containing biobased chemical fiber and a preparation method thereof. The prior preparation art for the PHBV has various defects. The biobased chemical fiber is a mixture of the PHBV and a second-component polymer, wherein 100 mass parts of biobased chemical fibers contain 1 to 89 mass parts of the PHBV and 11 to 99 mass parts of the second-component polymer. The second-component polymer is one or a mixture of two of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) copolymer (P(3HB-co-4HB)), poly(butylene succinate) (PBS), poly(butylene adipate/terephthalate) (PBAT), propene polymer (PP) and poly ethylene (PE). The specific preparation method comprises the following steps of: respectively performing vacuum drying on the PHBV and the second-component polymer; performing physical mixing according to the proportion; performing melt-spinning; and finally, performing aftertreatment. The biobased chemical fiber disclosed by the invention has high spinnability at low spinning temperature and high spinning speed and has high mechanical strength and continuous and stable soft handfeel; and the preparation method thereof can effectively improve production efficiency and reduce cost.
Description
Technical field
The invention belongs to technical field of polymer materials, relate to bio-based man-made fiber of a kind of PHBV of containing and preparation method thereof.
Background technology
Man-made fiber has become essential and Chemicals that consumption is huge in people's daily life, the industrial and agricultural production.The traditional chemical fiber is a raw material with the petroleum base polymer mainly, and is day by day exhausted because oil is Nonrenewable resources, for the Sustainable development of man-made fiber brings great crises.For tackling this crisis, people press for renewable resources especially bio-based man-made fiber are developed and utilized.
The raw material of bio-based man-made fiber can be single creature based high molecular, the high molecular mixture of two or more bio-based or bio-based polymer and the high molecular mixture of petroleum base; Its bio-based carbon content can according to standards such as ASTM D6866, ISO/NP 13833, adopts the radiocarbon dating technical measurement.According to developed country and geographic relevant regulations such as U.S.A, day, Europe; The bio-based product up to standard to the bio-based carbon content (comprising the bio-based man-made fiber) authorizes star or environmental protection identifies (like EcoLogo; OK Biobased etc.) the usage license, and then include the preferential procurement plan of biologics in.These policies are that applying of bio-based man-made fiber created opportunity.
In bio-based polymer family, polyhydroxybutyrate-valerate (PHBV) has caused concern more and more widely with its favorable biological degradability, biocompatibility and mechanical property.PHBV is to be that raw material is prepared from through microbial fermentation processes with starch, can under soil or composting conditions, be decomposed into carbonic acid gas, water and biomass.With PHBV is that feedstock production bio-based man-made fiber helps providing a kind of man-made fiber kind that meets environmental protection and Sustainable development requirement, expands its Application Areas simultaneously, thereby has crucial marketable value.
Fang Zhuanxi etc. (the polymer journal, 2004,4:500) adopt electrical spinning method to prepare the PHBV ultra-fine fibre, before spinning, need preparation PHBV/ chloroformic solution, the mean diameter that makes the PHBV fiber is 0.83～1.73 micron.
(synthetic technology and application such as neat China; 2008; 23:16) adopt electrical spinning method to prepare the ultra-fine blended fiber felt of PHBV/Ecoflex, before spinning, need preparation PHBV/Ecoflex/ dichloromethane solution, the mean diameter that makes the PHBV/Ecoflex blended fiber is 0.09～1.85 micron.
Zhu Shuqi etc. (synthon, 2009,7:13) adopt dry-spinning to prepare the PHBV fiber, before spinning, need preparation PHBV/ chloroform soln, under the spinning speed of 20m/min, obtain nascent fibre, again 70
o2～5 times of C stretched, and 120
oSurely extend thermal-setting under the C, the breaking tenacity that obtains the PHBV fiber is about 1.8cN/dtex, and elongation at break is more than 40%.
Tang Jian etc. (the academic free paper session of national polymer, C24,2003, Hangzhou) adopt melt spinning method to prepare PHBV/CO
2The polymer blending fiber, PHBV and CO
2The mass ratio of polymkeric substance is 60/40, and the fiberizability of fiber is better when hydroxypentanoic acid ester content (HV) is 7.5% among the PHBV.
The king carefully build etc. (synthetic fiber industry, 2008,31:46) adopt melt spinning method to prepare the PHBV/PCL blended fiber, spinning temperature is 175
oC, spinning speed are 50～80m/min.
With crystalline substance etc. (synthon, 2008,1:10) adopt melt spinning method to prepare PHBV/TiO
2Fiber, TiO
2Serve as nucleator, through in the hot water bath of spinning jet held, have spinning property and mechanical property preferably to guarantee fiber, the intensity that makes fiber is 1.052cN/dtex, and elongation is 157%.
Obviously, people have recognized the significance and importance of PHBV as the bio-based chemical fibre material.But, some chemical physical property of PHBV, as under comparatively high temps, be prone to degraded, crystallization velocity is slow, fragility is big etc., has seriously restricted development and the PHBV of the PHBV fiber production technology application as filamentary material.As previously mentioned, adopt electric spinning and dry-spinning legal system to be equipped with the PHBV fiber, no doubt avoided the thermal destruction of PHBV to a certain extent; But need before spinning, prepare PHBV solution; Use volatilization, noxious solvent, and spinning speed is low, causes lower production efficiency and higher cost.Adopt melt spinning method to prepare the PHBV fiber, then face problems such as PHBV thermal destruction, crystallization velocity is slow, fragility is big, can through with other polymer (like CO
2Polymkeric substance, PCL) blend or add nucleator (like TiO
2) improve.But CO
2Polymkeric substance is the amorphism polymer, is unfavorable for the raising of fiber mechanics intensity; The PCL fusing point is about 60
oC is with PHBV fusing point (150～160
oC) differ bigger, at PHBV spinning temperature (170～175
oC) PCL degrades down, is unfavorable for preparing the fiber of higher-strength equally; Add nucleator (TiO
2) can improve the crystallinity of PHBV, but still need limit the raising of spinning speed in the hot water bath of spinning jet held, nucleator also causes filament spinning component to stop up easily simultaneously, is unfavorable for long-term continuous production.Therefore; The mechanical strength of the fiber through the prepared PHBV of containing of present known method generally all is no more than 1.8cN/dtex; Demand development of new urgently and contain the bio-based man-made fiber of PHBV and improve fiber production technology, reduce production costs, satisfy request for utilization to improve fibre property.
Summary of the invention
First purpose of the present invention is to the above-mentioned state of the art, and a kind of bio-based man-made fiber that contains polyhydroxybutyrate-valerate (PHBV) is provided.
Bio-based man-made fiber of the present invention is PHBV and the high molecular mixture of second component, and mass fraction is that the mass fraction of each component is in 100 parts the bio-based man-made fiber:
1～89 part of PHBV
11～99 parts of the second component polymers.
Preferred version is:
1～9 part of PHBV
91～99 parts of the second component polymers.
Described PHBV, its weight-average molecular weight is 9～510,000, the hydroxyl valerate molar content is 3～43%;
The described second component polymer is one or both the mixture in 3-hydroxybutyric acid/4 hydroxybutyric acid multipolymer [P (3HB-co-4HB)], poly butylene succinate (PBS), poly terephthalic acid-hexanodioic acid-butanediol ester (PBAT), Vestolen PP 7052 (PP), the Vilaterm (PE), blending ratio be arbitrarily than.
The weight-average molecular weight of described P (3HB-co-4HB) is 7～710,000, and 4 hydroxybutyric acid molar content wherein is 4～20%;
The weight-average molecular weight of described PBS is 7～190,000;
The weight-average molecular weight of described PBAT is 2～80,000;
The melting index of described PP is 3～41g/10min;
The melting index of described PE is 3～41g/10min.
Second purpose of the present invention is the preparation method who proposes the bio-based man-made fiber of this PHBV of containing.
The inventive method may further comprise the steps: (1) is carried out vacuum-drying respectively with the PHBV in the aforementioned bio-based man-made fiber component and the second component polymer; (2) the dried PHBV and the second component polymer are carried out physical mixed by aforementioned ratio; (3) compound is injected the extrusion equipment fusion that has heating unit, then 174～216
oThe spinning speed that the spinning temperature of C, 500～1500m/ divide is collected macrofiber down, or adopts meltblowing method 174～216
oThe spinning temperature of C is collected non-woven fabrics down; (4) macrofiber or non-woven fabrics are carried out aftertreatment.
Compared with prior art, the invention has the advantages that: the bio-based man-made fiber of the disclosed PHBV of containing of the present invention is compared at lower spinning temperature (174～216 with common PHBV fiber
oC) and under the higher spinning speed (500～1500m/ branch) has spinning property preferably; And has higher mechanical strength (meeting or exceeding 1.8cN/dtex) and continual and steady than soft hand feeling; Therefore can satisfy request for utilization, and then the expanded application field.In addition, the PHBV melt viscosity is lower, when content less (1～9 part), can play " lubricating " effect to the higher high molecular component of content, makes the melt-spinning can be at lower spinning temperature (174
oC～216
oC) carry out under, thereby effectively avoid or alleviate the thermal destruction of raw material, further improve the long stapled mechanical strength of melt-spun (meeting or exceeding 2.0cN/dtex), reduce the energy consumption of melt-spinning simultaneously.The invention also discloses the preparation method of the bio-based man-made fiber of this PHBV of containing, through melt spinning method at lower spinning temperature (174～216
oC) and higher spinning speed (500～1500m/ branch) produce down macrofiber, or adopt meltblowing method 174～216
oThe spinning temperature of C is produced non-woven fabrics down, can effectively enhance productivity and reduce cost.
Embodiment
Below in conjunction with embodiment technical scheme of the present invention and effect are further described.
Comparative example 1:
Get weight-average molecular weight and be 510,000, the hydroxyl valerate molar content is that polyhydroxybutyrate-valerate (PHBV) of 23% carries out vacuum-drying, drying temperature is 60 ± 5
oC, time of drying are 16 hours, and vacuum tightness is 100Pa; Getting dried PHBV double centner, inject fusion in the single screw extrusion machine, be extruded into fiber through volume pump and orifice, is 172 at spinning temperature
oC and spinning speed are collected macrofiber for the 500m/ timesharing, and fiber seriously bonds and frequent fracture of wire, is difficult to obtain continuous fiber.Comparative example 1 explanation: adopt common melt spinning method to be difficult to obtain the PHBV macrofiber.
Comparative example 2:
Get the Vestolen PP 7052 that melting index is 22g/10min (PP) and carry out vacuum-drying, drying temperature is 80 ± 5
oC, time of drying are 6 hours, and vacuum tightness is 100Pa; Getting dried PP double centner, inject fusion in the single screw extrusion machine, be extruded into fiber through volume pump and orifice, is 250 at spinning temperature
oC and spinning speed are collected for the 1000m/ timesharing and are obtained continuous fiber, 60
oDrawing-off is 1.8 times under the C, again 70
oCarry out heat setting type under the C, recording this long stapled tensile strength is 1.7cN/dtex, and elongation at break is 15%.Comparative example 2 explanations: adopt common melt spinning method can obtain the PP macrofiber, but need to use higher spinning temperature, and the PP fiber does not belong to the bio-based man-made fiber.
Comparative example 3:
Get weight-average molecular weight and be 300,000, the hydroxyl valerate molar content is that polyhydroxybutyrate-valerate (PHBV) of 3% carries out vacuum-drying, drying temperature is 60 ± 5
oC, time of drying are 16 hours, and vacuum tightness is 100Pa; Get dried PHBV double centner, inject fusion in the single screw extrusion machine, be extruded into fiber through volume pump and orifice, adopting meltblowing method is 172 at spinning temperature
oCollect non-woven fabrics during C; With this non-woven fabrics 60
oCarry out heat setting type under the C.The non-woven fabrics feel is harder, significantly becomes fragile after at room temperature placing for 1 week.Comparative example 3 explanations: adopt common meltblowing method can obtain the PHBV non-woven fabrics, but the non-woven fabrics feel is harder, and unstable properties.
Embodiment 1:
The Vestolen PP 7052 (PP) that get weight-average molecular weight and be 510,000, the hydroxyl valerate molar content is polyhydroxybutyrate-valerate (PHBV) of 23% and melting index is 22g/10min carries out vacuum-drying, and drying temperature is 60 ± 5
oC, time of drying are 16 hours, and vacuum tightness is 100Pa; Get 89 kilograms of dried PHBV and dried PP and in impeller, carry out physical mixed for 11 kilograms; Compound is injected fusion in the twin screw extruder, be extruded into fiber through volume pump and orifice, collect and obtain the bio-based continuous fiber, spinning temperature is 195
oC, spinning speed are the 500m/ branch; 61
oDrawing-off is 2.4 times under the C, again 70
oCarry out heat setting type under the C, recording this long stapled tensile strength is 1.9cN/dtex, and elongation at break is 20%, and feel is soft, and afterwards feel is still soft at room temperature to place for 1 week.
Embodiment 2:
Get weight-average molecular weight and be 300,000, the hydroxyl valerate molar content is polyhydroxybutyrate-valerate (PHBV) of 3% and weight-average molecular weight is that poly terephthalic acid-hexanodioic acid-butanediol ester (PBAT) of 20,000 carries out vacuum-drying, drying temperature is 60 ± 5
oC, time of drying are 16 hours, and vacuum tightness is 100Pa; Get 45 kilograms of dried PHBV and dried PBAT and in impeller, carry out physical mixed for 55 kilograms; Compound is injected fusion in the single screw extrusion machine, be extruded into fiber through volume pump and orifice, collect and obtain the bio-based continuous fiber, spinning temperature is 174
oC, spinning speed are the 1000m/ branch; 50
oDrawing-off is 2.3 times under the C, again 60
oCarry out heat setting type under the C, recording this long stapled tensile strength is 1.8cN/dtex, and elongation at break is 37%, and is soft, at room temperature places still softness of 1 all backs feel.
Embodiment 3:
Get weight-average molecular weight and be 510,000, the hydroxyl valerate molar content is that 23% polyhydroxybutyrate-valerate (PHBV), weight-average molecular weight are that the Vestolen PP 7052 (PP) that 190,000 poly butylene succinate (PBS) and melting index are 3g/10min carries out vacuum-drying, drying temperature is 60 ± 5
oC, time of drying are 16 hours, and vacuum tightness is 100Pa; Get 9 kilograms of dried PHBV, 45.5 kilograms of dried PBS and dried PP and in impeller, carry out physical mixed for 45.5 kilograms; Compound is injected fusion in the twin screw extruder, be extruded into fiber through volume pump and orifice, collect and obtain the bio-based continuous fiber, spinning temperature is 216
oC, spinning speed are the 1500m/ branch; 60
oDrawing-off is 2.0 times under the C, again 72
oCarry out heat setting type under the C, recording this long stapled tensile strength is 2.5cN/dtex, and elongation at break is 31%, and is soft, at room temperature places still softness of 1 all backs feel.
Embodiment 4:
Get weight-average molecular weight and be 90,000, the hydroxyl valerate molar content is polyhydroxybutyrate-valerate (PHBV) of 43%; The Vilaterm (PE) that weight-average molecular weight is 390,000, the 4 hydroxybutyric acid molar content is 3-hydroxybutyric acid/4 hydroxybutyric acid multipolymer [P (3HB-co-4HB)] of 12% and melting index is 22g/10min carries out vacuum-drying, and drying temperature is 60 ± 5
oC, time of drying are 16 hours, and vacuum tightness is 100Pa; Get 5 kilograms of dried PHBV, 85.5 kilograms of dried P (3HB-co-4HB) and dried PE and in impeller, carry out physical mixed for 9.5 kilograms; Compound is injected fusion in the twin screw extruder, be extruded into fiber through volume pump and orifice, collect and obtain the bio-based continuous fiber, spinning temperature is 174
oC, spinning speed are the 500m/ branch; 50
oDrawing-off is 2.7 times under the C, again 60
oCarry out heat setting type under the C, recording this long stapled tensile strength is 2.2cN/dtex, and elongation at break is 27%, and feel is soft, and afterwards feel is still soft at room temperature to place for 1 week.
Embodiment 5:
Get weight-average molecular weight and be 250,000, the hydroxyl valerate molar content is that 5% polyhydroxybutyrate-valerate (PHBV), weight-average molecular weight are that the Vestolen PP 7052 (PP) that 70,000 poly butylene succinate (PBS) and melting index are 41g/10min carries out vacuum-drying, drying temperature is 60 ± 5
oC, time of drying are 16 hours, and vacuum tightness is 100Pa; Get 1 kilogram of dried PHBV, 49.5 kilograms of dried PBS and dried PP and in impeller, carry out physical mixed for 49.5 kilograms; Compound is injected fusion in the twin screw extruder, be extruded into fiber through volume pump and orifice, collect and obtain the bio-based continuous fiber, spinning temperature is 195
oC, spinning speed are the 1000m/ branch; 55
oDrawing-off is 2.4 times under the C, again 65
oCarry out heat setting type under the C, recording this long stapled tensile strength is 2.3cN/dtex, and elongation at break is 32%, and is soft, at room temperature places still softness of 1 all backs feel.
Embodiment 6:
The Vilaterm (PE) that get weight-average molecular weight and be 510,000, the hydroxyl valerate molar content is polyhydroxybutyrate-valerate (PHBV) of 30% and melting index is 3g/10min carries out vacuum-drying, and drying temperature is 60 ± 5
oC, time of drying are 16 hours, and vacuum tightness is 100Pa; Get 89 kilograms of dried PHBV and dried PE and in impeller, carry out physical mixed for 11 kilograms; Compound is injected fusion in the twin screw extruder, be extruded into fiber through volume pump and orifice, adopting meltblowing method is 216 at spinning temperature
oCollect during C and obtain the bio-based non-woven fabrics; With this non-woven fabrics 55
oCarry out heat setting type under the C; The non-woven fabrics feel is soft, and afterwards feel is still soft at room temperature to place for 1 week.
Embodiment 7:
Get weight-average molecular weight and be 90,000, the hydroxyl valerate molar content is polyhydroxybutyrate-valerate (PHBV) of 43% and weight-average molecular weight is that poly terephthalic acid-hexanodioic acid-butanediol ester (PBAT) of 50,000 carries out vacuum-drying, drying temperature is 60 ± 5
oC, time of drying are 16 hours, and vacuum tightness is 100Pa; Get 55 kilograms of dried PHBV and dried PBAT and in impeller, carry out physical mixed for 45 kilograms; Compound is injected fusion in the single screw extrusion machine, be extruded into fiber through volume pump and orifice, adopting meltblowing method is 174 at spinning temperature
oCollect during C and obtain the bio-based non-woven fabrics; With this non-woven fabrics 50
oCarry out heat setting type under the C; Non-woven fabrics is soft, at room temperature places still softness of 1 all backs feel.
Embodiment 8:
Get weight-average molecular weight and be 150,000, the hydroxyl valerate molar content is polyhydroxybutyrate-valerate (PHBV) of 3% and weight-average molecular weight is 710,000, the 4 hydroxybutyric acid molar content is that 3-hydroxybutyric acid/4 hydroxybutyric acid multipolymer [P (3HB-co-4HB)] of 20% carries out vacuum-drying, drying temperature is 60 ± 5
oC, time of drying are 16 hours, and vacuum tightness is 100Pa; Get 9 kilograms of dried PHBV and dried P (3HB-co-4HB) and in impeller, carry out physical mixed for 91 kilograms; Compound is injected fusion in the single screw extrusion machine, be extruded into fiber through volume pump and orifice, adopting meltblowing method is 174 at spinning temperature
oCollect during C and obtain the bio-based non-woven fabrics; With this non-woven fabrics 50
oCarry out heat setting type under the C; Non-woven fabrics is soft, at room temperature places still softness of 1 all backs feel.
Embodiment 9:
Get weight-average molecular weight and be 510,000, the hydroxyl valerate molar content is polyhydroxybutyrate-valerate (PHBV) of 33%; Weight-average molecular weight is 70,000, the 4 hydroxybutyric acid molar content is 3-hydroxybutyric acid/4 hydroxybutyric acid multipolymer [P (3HB-co-4HB)] of 4% and weight-average molecular weight is that 130,000 poly butylene succinate (PBS) carries out vacuum-drying, and drying temperature is 60 ± 5
oC, time of drying are 16 hours, and vacuum tightness is 100Pa; Get 3 kilograms of dried PHBV, 9.5 kilograms of dried P (3HB-co-4HB) and dried PBS and in impeller, carry out physical mixed for 87.5 kilograms; Compound is injected fusion in the single screw extrusion machine, be extruded into fiber through volume pump and orifice, adopting meltblowing method is 195 at spinning temperature
oCollect during C and obtain the bio-based non-woven fabrics; With this non-woven fabrics 50
oCarry out heat setting type under the C; Non-woven fabrics is soft, at room temperature places still softness of 1 all backs feel.
Embodiment 10:
Get weight-average molecular weight and be 450,000, the hydroxyl valerate molar content is polyhydroxybutyrate-valerate (PHBV) of 6%; Weight-average molecular weight is that the Vilaterm (PE) that 80,000 poly terephthalic acid-hexanodioic acid-butanediol ester (PBAT) and melting index are 41g/10min carries out vacuum-drying, and drying temperature is 60 ± 5
oC, time of drying are 16 hours, and vacuum tightness is 100Pa; Get 1 kilogram of dried PHBV, 49.5 kilograms of dried PBAT and dried PE and in impeller, carry out physical mixed for 49.5 kilograms; Compound is injected fusion in the twin screw extruder, be extruded into fiber through volume pump and orifice, adopting meltblowing method is 195 at spinning temperature
oCollect during C and obtain the bio-based non-woven fabrics; With this non-woven fabrics 50
oCarry out heat setting type under the C; Non-woven fabrics is soft, at room temperature places still softness of 1 all backs feel.
Claims (1)
1. a bio-based man-made fiber that contains PHBV is characterized in that this bio-based man-made fiber is PHBV and the high molecular mixture of second component, and mass fraction is that the mass fraction of each component is in 100 parts the bio-based man-made fiber:
1～89 part of PHBV
11～99 parts of the second component polymers
The described second component polymer is one or both the mixture in 3-hydroxybutyric acid/4 hydroxybutyric acid multipolymer, poly butylene succinate, poly terephthalic acid-hexanodioic acid-butanediol ester, Vestolen PP 7052, the Vilaterm, blending ratio be arbitrarily than;
The weight-average molecular weight of described PHBV is 9～510,000, and hydroxyl valerate molar content wherein is 3～43%;
The weight-average molecular weight of described 3-hydroxybutyric acid/4 hydroxybutyric acid multipolymer is 7～710,000, and 4 hydroxybutyric acid molar content wherein is 4～20%;
The weight-average molecular weight of described poly butylene succinate is 7～190,000;
The weight-average molecular weight of described poly terephthalic acid-hexanodioic acid-butanediol ester is 2～80,000;
Described polyacrylic melting index is 3～41g/10min;
Described poly melting index is 3～41g/10min.
2, a kind of preparation contains the method for the bio-based man-made fiber of PHBV, it is characterized in that this method may further comprise the steps: (1) is carried out vacuum-drying respectively with the PHBV and the second component polymer; (2) the dried PHBV and the second component polymer are carried out physical mixed in proportion; (3) compound is injected the extrusion equipment fusion that has heating unit, then 174～216
oThe spinning speed that the spinning temperature of C, 500～1500m/ divide is collected macrofiber down, or adopts meltblowing method 174～216
oThe spinning temperature of C is collected non-woven fabrics down; (4) macrofiber or non-woven fabrics are carried out aftertreatment;
Mass fraction is that PHBV and the high molecular mass fraction of second component are in 100 parts the compound:
1～89 part of PHBV
11～99 parts of the second component polymers
The described second component polymer is one or both the mixture in 3-hydroxybutyric acid/4 hydroxybutyric acid multipolymer, poly butylene succinate, poly terephthalic acid-hexanodioic acid-butanediol ester, Vestolen PP 7052, the Vilaterm, blending ratio be arbitrarily than;
The weight-average molecular weight of described PHBV is 9～510,000, and hydroxyl valerate molar content wherein is 3～43%;
The weight-average molecular weight of described 3-hydroxybutyric acid/4 hydroxybutyric acid multipolymer is 7～710,000, and 4 hydroxybutyric acid molar content wherein is 4～20%;
The weight-average molecular weight of described poly butylene succinate is 7～190,000;
The weight-average molecular weight of described poly terephthalic acid-hexanodioic acid-butanediol ester is 2～80,000;
Described polyacrylic melting index is 3～41g/10min;
Described poly melting index is 3～41g/10min.
3, a kind of bio-based man-made fiber that contains PHBV as claimed in claim 1 is characterized in that mass fraction is that the mass fraction of each component is in 100 parts the bio-based man-made fiber:
1～9 part of PHBV
91～99 parts of the second component polymers.
4, a kind of preparation as claimed in claim 2 contains the method for the bio-based man-made fiber of PHBV, it is characterized in that mass fraction is that PHBV and the high molecular mass fraction of second component are in 100 parts the compound:
1～9 part of PHBV
91～99 parts of the second component polymers.
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