CN102146598A - 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 chemical fibre of a kind of PHBV of containing and preparation method thereof.
Background technology
Chemical fibre has become essential and chemical products 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 macromolecule mainly, and is day by day exhausted because oil is non-renewable resources, for the sustainable development of chemical fibre brings great crises.For tackling this crisis, people press for renewable resource especially bio-based chemical fibre are developed and utilized.
The raw material of bio-based chemical fibre can be single creature based high molecular, the high molecular mixture of two or more bio-based or bio-based macromolecule and the high molecular mixture of petroleum base, its bio-based carbon content can adopt the radiocarbon dating technical measurement according to standards such as ASTM D6866, ISO/NP 13833.According to developed country and regional relevant regulations such as U.S., day, Europe, the bio-based product up to standard to the bio-based carbon content (comprising the bio-based chemical fibre) authorizes star or environmental protection identifies (as EcoLogo, OK Biobased etc.) the usage license, and then include the preferential procurement plan of biological product in.These policies are that applying of bio-based chemical fibre created opportunity.
In bio-based macromolecule family, poly butyric-valerate (PHBV) has caused more and more widely concern with its favorable biological degradability, biocompatibility and mechanical property.PHBV is to be that raw material is prepared from by microbial fermentation processes with starch, can be decomposed into carbon dioxide, water and living beings under soil or composting conditions.With PHBV is that feedstock production bio-based chemical fibre helps providing a kind of chemical fibre kind that meets environmental protection and sustainable development requirement, expands its Application Areas simultaneously, thereby has crucial market value.
Fang Zhuanxi etc. (the macromolecule journal, 2004,4:500) adopt electrical spinning method to prepare the PHBV superfine fibre, before spinning, need to prepare the PHBV/ chloroformic solution, the average 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, need to prepare the PHBV/Ecoflex/ dichloromethane solution before spinning, the average diameter that makes the PHBV/Ecoflex blended fiber is 0.09～1.85 micron.
Zhu Shuqi etc. (synthetic fiber, 2009,7:13) adopt dry spinning to prepare the PHBV fiber, before spinning, need to prepare the PHBV/ chloroform soln, under the spinning speed of 20m/min, obtain as-spun fibre, again 70
oC stretches 2～5 times down, and 120
oSurely extend heat setting under the C, the fracture strength 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 macromolecule, C24,2003, Hangzhou) adopt melt spinning method to prepare PHBV/CO
2The polyblend fiber, PHBV and CO
2The mass ratio of polymer is 60/40, and the fibre forming property 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. (synthetic fiber, 2008,1:10) adopt melt spinning method to prepare PHBV/TiO
2Fiber, TiO
2Serve as nucleator, by place hot bath under spinnerets, have spinnability and mechanical property preferably to guarantee fiber, the intensity that makes fiber is 1.052cN/dtex, and percentage 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 easily degraded under at higher temperature, crystallization rate is slow, fragility is big etc., has seriously restricted the development of PHBV fiber production technology and the PHBV application as fibrous material.As previously mentioned, adopt electrospinning silk and dry spinning legal system to be equipped with the PHBV fiber, no doubt avoided the thermal degradation of PHBV to a certain extent, but need before spinning, prepare PHBV solution, use volatilization, toxic 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 degradation, crystallization rate is slow, fragility is big, can by with other macromolecule (as CO
2Polymer, PCL) blend or add nucleator (as TiO
2) improved.But CO
2Polymer is the amorphism macromolecule, 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 under spinnerets, place hot bath, having limited the raising of spinning speed, nucleator also causes filament spinning component to stop up easily simultaneously, is unfavorable for long-term production continuously.Therefore, the mechanical strength of the fiber by 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 chemical fibre of PHBV and improve fiber production technology, reduce production costs, satisfy instructions for use to improve fibre property.
Summary of the invention
First purpose of the present invention is at the above-mentioned state of the art, and a kind of bio-based chemical fibre that contains poly butyric-valerate (PHBV) is provided.
Bio-based chemical fibre 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 chemical fibre:
1～89 part of PHBV
11～99 parts of the second component macromolecules.
Preferred version is:
1～9 part of PHBV
91～99 parts of the second component macromolecules.
Described PHBV, its weight average molecular weight is 9～510,000, the hydroxyl valerate molar content is 3～43%;
The described second component macromolecule is one or both the mixture in 3-hydroxybutyric acid/4 hydroxybutyric acid copolymer [P (3HB-co-4HB)], poly butylene succinate (PBS), poly terephthalic acid-adipic acid-butanediol ester (PBAT), polypropylene (PP), the polyethylene (PE), mixed proportion 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 melt index of described PP is 3～41g/10min;
The melt index of described PE is 3～41g/10min.
Second purpose of the present invention is the preparation method who proposes the bio-based chemical fibre of this PHBV of containing.
The inventive method may further comprise the steps: (1) carries out vacuumize respectively with the PHBV in the aforementioned bio-based chemical fibre component and the second component macromolecule; (2) the dried PHBV and the second component macromolecule are carried out physical mixed by aforementioned ratio; (3) compound is injected the extrusion equipment fusion that has heater, then 174～216
oThe spinning speed that the spinning temperature of C, 500～1500m/ divide is collected long fiber down, or adopts meltblowing method 174～216
oThe spinning temperature of C is collected nonwoven fabric down; (4) long fiber or nonwoven fabric are carried out post processing.
Compared with prior art, the invention has the advantages that: the bio-based chemical fibre of the PHBV of containing disclosed in this invention is compared at lower spinning temperature (174～216 with common PHBV fiber
oC) and under the higher spinning speed (500～1500m/ branch) has spinnability preferably, and has higher mechanical strength (meeting or exceeding 1.8cN/dtex) and continual and steady than soft hand feeling, therefore can satisfy instructions for use, and then the expanded application field.In addition, the PHBV melt viscosity is lower, can play " lubricating " effect to the higher high molecular component of content when content less (1～9 part), makes the melt spinning can be at lower spinning temperature (174
oC～216
oC) carry out under, thereby effectively avoid or alleviate the thermal degradation 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 chemical fibre of this PHBV of containing, by melt spinning method at lower spinning temperature (174～216
oC) and higher spinning speed (500～1500m/ branch) produce down long fiber, or adopt meltblowing method 174～216
oThe spinning temperature of C is produced nonwoven fabric down, can effectively enhance productivity and reduce cost.
The specific 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 poly butyric-valerate (PHBV) of 23% carries out vacuumize, baking temperature is 60 ± 5
oC, drying time are 16 hours, and vacuum is 100Pa; Getting dried PHBV double centner, inject fusion in the single screw extrusion machine, be extruded into fiber through measuring pump and spinneret orifice, is 172 at spinning temperature
oC and spinning speed are collected long fiber 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 long fiber.
Comparative example 2:
Get the polypropylene that melt index is 22g/10min (PP) and carry out vacuumize, baking temperature is 80 ± 5
oC, drying time are 6 hours, and vacuum is 100Pa; Getting dried PP double centner, inject fusion in the single screw extrusion machine, be extruded into fiber through measuring pump and spinneret 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 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 long fiber, but need to use higher spinning temperature, and the PP fiber does not belong to the bio-based chemical fibre.
Comparative example 3:
Get weight average molecular weight and be 300,000, the hydroxyl valerate molar content is that poly butyric-valerate (PHBV) of 3% carries out vacuumize, baking temperature is 60 ± 5
oC, drying time are 16 hours, and vacuum is 100Pa; Get dried PHBV double centner, inject fusion in the single screw extrusion machine, be extruded into fiber through measuring pump and spinneret orifice, adopting meltblowing method is 172 at spinning temperature
oCollect nonwoven fabric during C; With this nonwoven fabric 60
oCarry out HEAT SETTING under the C.The nonwoven fabric 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 nonwoven fabric, but the nonwoven fabric feel is harder, and unstable properties.
Embodiment 1:
The polypropylene (PP) that get weight average molecular weight and be 510,000, the hydroxyl valerate molar content is poly butyric-valerate (PHBV) of 23% and melt index is 22g/10min carries out vacuumize, and baking temperature is 60 ± 5
oC, drying time are 16 hours, and vacuum is 100Pa; Get 89 kilograms of dried PHBV and dried PP and in homogenizer, carry out physical mixed for 11 kilograms; Compound is injected fusion in the double screw extruder, be extruded into fiber through measuring pump and spinneret 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 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 poly butyric-valerate (PHBV) of 3% and weight average molecular weight is that poly terephthalic acid-adipic acid-butanediol ester (PBAT) of 20,000 carries out vacuumize, baking temperature is 60 ± 5
oC, drying time are 16 hours, and vacuum is 100Pa; Get 45 kilograms of dried PHBV and dried PBAT and in homogenizer, carry out physical mixed for 55 kilograms; Compound is injected fusion in the single screw extrusion machine, be extruded into fiber through measuring pump and spinneret 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 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% poly butyric-valerate (PHBV), weight average molecular weight are that the polypropylene (PP) that 190,000 poly butylene succinate (PBS) and melt index are 3g/10min carries out vacuumize, baking temperature is 60 ± 5
oC, drying time are 16 hours, and vacuum is 100Pa; Get 45.5 kilograms of 9 kilograms of dried PHBV, dried PBS and dried PP and in homogenizer, carry out physical mixed for 45.5 kilograms; Compound is injected fusion in the double screw extruder, be extruded into fiber through measuring pump and spinneret 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 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 poly butyric-valerate (PHBV) of 43%, the polyethylene (PE) that weight average molecular weight is 390,000, the 4 hydroxybutyric acid molar content is 3-hydroxybutyric acid/4 hydroxybutyric acid copolymer [P (3HB-co-4HB)] of 12% and melt index is 22g/10min carries out vacuumize, and baking temperature is 60 ± 5
oC, drying time are 16 hours, and vacuum is 100Pa; Get 85.5 kilograms of 5 kilograms of dried PHBV, dried P (3HB-co-4HB) and dried PE and in homogenizer, carry out physical mixed for 9.5 kilograms; Compound is injected fusion in the double screw extruder, be extruded into fiber through measuring pump and spinneret 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 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% poly butyric-valerate (PHBV), weight average molecular weight are that the polypropylene (PP) that 70,000 poly butylene succinate (PBS) and melt index are 41g/10min carries out vacuumize, baking temperature is 60 ± 5
oC, drying time are 16 hours, and vacuum is 100Pa; Get 49.5 kilograms of 1 kilogram of dried PHBV, dried PBS and dried PP and in homogenizer, carry out physical mixed for 49.5 kilograms; Compound is injected fusion in the double screw extruder, be extruded into fiber through measuring pump and spinneret 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 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 polyethylene (PE) that get weight average molecular weight and be 510,000, the hydroxyl valerate molar content is poly butyric-valerate (PHBV) of 30% and melt index is 3g/10min carries out vacuumize, and baking temperature is 60 ± 5
oC, drying time are 16 hours, and vacuum is 100Pa; Get 89 kilograms of dried PHBV and dried PE and in homogenizer, carry out physical mixed for 11 kilograms; Compound is injected fusion in the double screw extruder, be extruded into fiber through measuring pump and spinneret orifice, adopting meltblowing method is 216 at spinning temperature
oCollect during C and obtain the bio-based nonwoven fabric; With this nonwoven fabric 55
oCarry out HEAT SETTING under the C; The nonwoven fabric 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 poly butyric-valerate (PHBV) of 43% and weight average molecular weight is that poly terephthalic acid-adipic acid-butanediol ester (PBAT) of 50,000 carries out vacuumize, baking temperature is 60 ± 5
oC, drying time are 16 hours, and vacuum is 100Pa; Get 55 kilograms of dried PHBV and dried PBAT and in homogenizer, carry out physical mixed for 45 kilograms; Compound is injected fusion in the single screw extrusion machine, be extruded into fiber through measuring pump and spinneret orifice, adopting meltblowing method is 174 at spinning temperature
oCollect during C and obtain the bio-based nonwoven fabric; With this nonwoven fabric 50
oCarry out HEAT SETTING under the C; Nonwoven fabric 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 poly butyric-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 copolymer [P (3HB-co-4HB)] of 20% carries out vacuumize, baking temperature is 60 ± 5
oC, drying time are 16 hours, and vacuum is 100Pa; Get 9 kilograms of dried PHBV and dried P (3HB-co-4HB) and in homogenizer, carry out physical mixed for 91 kilograms; Compound is injected fusion in the single screw extrusion machine, be extruded into fiber through measuring pump and spinneret orifice, adopting meltblowing method is 174 at spinning temperature
oCollect during C and obtain the bio-based nonwoven fabric; With this nonwoven fabric 50
oCarry out HEAT SETTING under the C; Nonwoven fabric 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 poly butyric-valerate (PHBV) of 33%, weight average molecular weight is 70,000, the 4 hydroxybutyric acid molar content is 3-hydroxybutyric acid/4 hydroxybutyric acid copolymer [P (3HB-co-4HB)] of 4% and weight average molecular weight is that 130,000 poly butylene succinate (PBS) carries out vacuumize, and baking temperature is 60 ± 5
oC, drying time are 16 hours, and vacuum is 100Pa; Get 9.5 kilograms of 3 kilograms of dried PHBV, dried P (3HB-co-4HB) and dried PBS and in homogenizer, carry out physical mixed for 87.5 kilograms; Compound is injected fusion in the single screw extrusion machine, be extruded into fiber through measuring pump and spinneret orifice, adopting meltblowing method is 195 at spinning temperature
oCollect during C and obtain the bio-based nonwoven fabric; With this nonwoven fabric 50
oCarry out HEAT SETTING under the C; Nonwoven fabric 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 poly butyric-valerate (PHBV) of 6%, weight average molecular weight is that the polyethylene (PE) that 80,000 poly terephthalic acid-adipic acid-butanediol ester (PBAT) and melt index are 41g/10min carries out vacuumize, and baking temperature is 60 ± 5
oC, drying time are 16 hours, and vacuum is 100Pa; Get 49.5 kilograms of 1 kilogram of dried PHBV, dried PBAT and dried PE and in homogenizer, carry out physical mixed for 49.5 kilograms; Compound is injected fusion in the double screw extruder, be extruded into fiber through measuring pump and spinneret orifice, adopting meltblowing method is 195 at spinning temperature
oCollect during C and obtain the bio-based nonwoven fabric; With this nonwoven fabric 50
oCarry out HEAT SETTING under the C; Nonwoven fabric is soft, at room temperature places still softness of 1 all backs feel.
Claims (8)
1. a bio-based chemical fibre that contains PHBV is characterized in that this bio-based chemical fibre 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 chemical fibre:
1～89 part of PHBV
11～99 parts of the second component macromolecules
The described second component macromolecule is one or both the mixture in 3-hydroxybutyric acid/4 hydroxybutyric acid copolymer, poly butylene succinate, poly terephthalic acid-adipic acid-butanediol ester, polypropylene, the polyethylene, mixed proportion be arbitrarily than.
2. method for preparing the bio-based chemical fibre that contains PHBV, it is characterized in that this method may further comprise the steps: (1) carries out vacuumize respectively with the PHBV and the second component macromolecule; (2) the dried PHBV and the second component macromolecule are carried out physical mixed in proportion; (3) compound is injected the extrusion equipment fusion that has heater, then 174～216
oThe spinning speed that the spinning temperature of C, 500～1500m/ divide is collected long fiber down, or adopts meltblowing method 174～216
oThe spinning temperature of C is collected nonwoven fabric down; (4) long fiber or nonwoven fabric are carried out post processing;
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 macromolecules
The described second component macromolecule is one or both the mixture in 3-hydroxybutyric acid/4 hydroxybutyric acid copolymer, poly butylene succinate, poly terephthalic acid-adipic acid-butanediol ester, polypropylene, the polyethylene, mixed proportion be arbitrarily than.
3. a kind of bio-based chemical fibre 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 chemical fibre:
1～9 part of PHBV
91～99 parts of the second component macromolecules.
4. a kind of bio-based chemical fibre that contains PHBV as claimed in claim 1, the weight average molecular weight that it is characterized in that described PHBV is 9～510,000, hydroxyl valerate molar content wherein is 3～43%.
5. a kind of bio-based chemical fibre that contains PHBV as claimed in claim 1, the weight average molecular weight that it is characterized in that the 3-hydroxybutyric acid/4 hydroxybutyric acid copolymer described in the second component macromolecule 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-adipic acid-butanediol ester is 2～80,000;
Described polyacrylic melt index is 3～41g/10min;
Described poly melt index is 3～41g/10min.
6. a kind of preparation as claimed in claim 2 contains the method for the bio-based chemical fibre 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 macromolecules.
7. a kind of preparation as claimed in claim 2 contains the method for the bio-based chemical fibre of PHBV, and the weight average molecular weight that it is characterized in that described PHBV is 9～510,000, and hydroxyl valerate molar content wherein is 3～43%.
8. a kind of preparation as claimed in claim 2 contains the method for the bio-based chemical fibre of PHBV, the weight average molecular weight that it is characterized in that the 3-hydroxybutyric acid/4 hydroxybutyric acid copolymer described in the second component macromolecule 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-adipic acid-butanediol ester is 2～80,000;
Described polyacrylic melt index is 3～41g/10min;
Described poly melt index is 3～41g/10min.
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| CN115537966A (en) * | 2022-11-09 | 2022-12-30 | 广东必得福医卫科技股份有限公司 | PHA (polyhydroxyalkanoate) bio-based degradable fiber and melt spinning method thereof |
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