CN116219636A - Preparation method of high-strength high-toughness degradable melt-blown nonwoven material - Google Patents
Preparation method of high-strength high-toughness degradable melt-blown nonwoven material Download PDFInfo
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/56—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/541—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/542—Adhesive fibres
- D04H1/55—Polyesters
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- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
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- D10B2401/12—Physical properties biodegradable
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- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
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Abstract
The invention discloses a preparation method of a high-strength high-toughness degradable melt-blown nonwoven material, which comprises the following steps: s1, premixing: taking polylactic acid slices and polybutylene succinate slices as raw materials, and premixing under certain conditions to obtain polylactic acid/polybutylene succinate premixed slices; s2, melt blending: injecting the prepared polylactic acid/polybutylene succinate premixed slice into a double-screw extruder for melting, and extruding into a trickle melt through a metering pump and a clothes hanger die head; s3, hot melt molding: and (3) stretching and shearing the melt by high-temperature high-speed airflow to obtain fibers, and collecting the fibers by a receiving device through a self-adhesive synthetic net to obtain polylactic acid melt-blown non-woven materials with different structures. The preparation method provided by the invention only needs one-time blending, and can realize the improvement of the toughness of the polylactic acid melt-blown nonwoven material without an additional device. In addition, the polylactic acid and the polybutylene succinate are used as raw materials, so that the full-degradable environment-friendly material can be fully degradable, and meets the requirement of sustainable development.
Description
Technical Field
The invention belongs to the technical field of non-woven fabrics, and particularly relates to a preparation method of a high-strength high-toughness degradable melt-blown non-woven material.
Background
The melt blown nonwoven process utilizes high velocity hot air to draw a polymer melt stream extruded through a die orifice, thereby forming microfibers and condensing on a web curtain or drum and bonding to itself to form a nonwoven. The melt-blown nonwoven material prepared by the process has the characteristics of large specific surface area, high porosity, fluffy structure and the like, and is widely applied to the fields of filtration, heat preservation, medical treatment, health and the like. However, the melt-blown nonwoven materials at present are mostly mainly made of polypropylene raw materials, which belong to non-renewable resources, waste is not easy to degrade, and the resources and the environment are burdened. With the continuous enhancement of ecological consciousness and environmental consciousness of people, degradable melt-blown nonwoven materials become research hot spots.
Polylactic acid is a thermoplastic aliphatic polyester and is recognized as a degradable material with the highest potential to replace polypropylene, but polylactic acid melt-blown nonwoven materials have the defects of high brittleness and poor mechanical properties due to high glass transition temperature and slow crystallization rate of polylactic acid, so that the polylactic acid melt-blown nonwoven materials are difficult to produce and apply on a large scale. Various modifications to polylactic acid materials have been made by researchers, and there have been reported the following in order to obtain polylactic acid melt-blown nonwoven fabrics excellent in properties.
Chinese patent (publication No. CN 105088542B) discloses a high-elongation modified polylactic acid SMS composite nonwoven material and a preparation method thereof, and specifically discloses the following technical scheme: taking 5-30 parts by mass of polyamide elastomer and 70-95 parts by mass of polylactic acid as raw materials, and performing melt blowing to obtain the polylactic acid blending melt-blown nonwoven material. The obtained melt-blown nonwoven material has a longitudinal strength of 40-150N/5cm and a longitudinal elongation at break of 60-130%. The material produced by this method has excellent toughness, but the non-degradable properties of polyamide are ignored.
Chinese patent (publication No. CN 113293517B) discloses a polylactic acid elastic superfine fiber nonwoven material, a preparation method and application thereof, and specifically discloses the following technical scheme: 10-20 parts of polyethylene glycol, 10-20 parts of nanocellulose, 20-40 parts of bio-based elastomer and 60-70 parts of polylactic acid by mass are used as raw materials, and the polylactic acid blending melt-blown nonwoven material is obtained through melt-blowing. The obtained melt-blown nonwoven material has a longitudinal strength of 50-80N/5cm and a longitudinal elongation at break of 56-75%. The material manufactured by the method has high toughness, but the method has complex process, time consumption and high cost, and needs to be subjected to three times of blending and a multistage heat drafting device.
The prior modified polylactic acid melt-blown non-woven fabric mainly focuses on adding reinforcing and toughening materials at the same time and improving phase interfaces, and can achieve the effect of reinforcing and toughening, but has complex procedures, long time consumption and high cost, and the problem of solvent volatilization is caused by frequently neglecting the degradability of the added materials. Therefore, how to produce a fully degradable, high-strength and high-toughness polylactic acid melt-blown nonwoven material by a simple process has become an urgent problem to be solved by the industry.
The morphology of the dispersed phase in the blend has a great influence on the mechanical properties. The dispersed phase morphology of the binary blend is mainly divided into a single-phase continuous structure, a two-phase staggered structure and a two-phase continuous structure. The in-situ microfiber structure and the two-phase continuous structure in the single-phase continuous structure are popular fields of polymer blending research. The in-situ microfiber structure refers to a structure that a disperse phase exists in a matrix in a microfiber form, and the higher orientation of the microfiber is beneficial to the increase of mechanical strength; the two-phase continuous structure refers to a network structure of polymer systems penetrating each other, which is beneficial to the conduction of stress. However, no research report on strengthening and modifying the polylactic acid melt-blown nonwoven material by controlling the morphology and structure of the disperse phase exists at present.
Polybutylene succinate (PBS) is a completely biodegradable high polymer material, has good biocompatibility and good toughness.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a preparation method of a polylactic acid melt-blown nonwoven material which has the advantages of simple preparation process, no toxicity, no harm, full degradability and high strength and toughness.
In order to achieve the above object, the present invention adopts the following technical scheme
A preparation method of a high-strength and high-toughness polylactic acid melt-blown nonwoven material comprises the following steps:
s1, premixing: taking polylactic acid slices and polybutylene succinate slices as raw materials, and premixing under certain conditions to obtain polylactic acid/polybutylene succinate premixed slices;
s2, melt blending: injecting the prepared polylactic acid/polybutylene succinate premixed slice into a double-screw extruder for melting, and extruding into a trickle melt through a metering pump and a clothes hanger die head;
s3, hot melt molding: and (3) stretching and shearing the prepared trickle melt by high-temperature high-speed airflow to obtain fibers, and collecting the fibers by a receiving device through a self-adhesive synthetic net to obtain the polylactic acid melt-blown nonwoven material.
Preferably, in step S1, a drying treatment is required before premixing the polylactic acid slice and the polybutylene succinate slice.
Preferably, the drying treatment condition is vacuum drying, the temperature of the vacuum drying is 40-100 ℃, and the time of the vacuum drying is 12-72h.
Preferably, in step S1, the temperature of the premixing is room temperature, and the premixing time is 10-40min.
Preferably, in step S2, the screw extruder is divided into four temperature zones, and the temperatures of the four temperature zones are respectively: 170-200 ℃, 180-210 ℃, 190-230 ℃ and 220-250 ℃.
Preferably, in step S2, the temperature of the hanger-type die head is 230-260 ℃.
Preferably, in the step S2, the melt extrusion amount of the combined device of the double-screw extruder and the clothes hanger type die head is 20-90g/min;
preferably, in step S3, the temperature of the high-speed high-temperature air flow is 240-290 ℃; the speed of the high-speed high-temperature air flow is 100-300m/s; the receiving distance of the receiving device is 5-40cm.
Preferably, the mass part ratio of the polylactic acid slice to the polybutylene succinate slice is 20-95:5-80.
The second purpose of the invention is to provide the high-strength and high-toughness polylactic acid melt-blown non-woven material prepared by the preparation method, wherein the high-strength and high-toughness polylactic acid melt-blown non-woven material is any one of an in-situ microfiber structure, a two-phase continuous structure or a sea-island structure.
Preferably, the high strength, high toughness polylactic acid melt blown nonwoven material has an average diameter of 3 to 15 μm.
The invention also aims to provide the application of the high-strength high-toughness polylactic acid melt-blown nonwoven material in the filtration and protection fields.
The invention has the following beneficial effects:
(1) The invention aims to construct different disperse phase morphological structures by utilizing stress characteristics of different stages of a melt-blowing process and high cooling rate (the melt-blowing process) so as to strengthen and toughen the polylactic acid melt-blown non-woven material. The high-strength and high-toughness polylactic acid melt-blown nonwoven material is prepared by taking polylactic acid slices and polybutylene succinate slices as raw materials and sequentially carrying out premixing, melt extrusion, high-speed high-temperature air flow stretching and shearing and self-adhesion networking processes, and simultaneously controlling the proportion of a matrix material and a reinforcing material and the temperature and the speed of the high-speed high-temperature air flow. Specifically, the PBS is firstly dispersed in PLA in the form of spherical droplets by utilizing the shearing force in the screw, and then the spherical droplets of the PBS are evolved into specific structures (such as an in-situ microfiber structure, a two-phase continuous structure and a sea-island structure) with different forms in the PLA matrix under the action of extrusion of a die head under specific conditions and hot air flow. The preparation method provided by the invention only needs one-time blending, and can realize the improvement of the toughness of the polylactic acid melt-blown nonwoven material without an additional device.
(2) The preparation method of the invention has no solvent volatilization problem, namely no pollution problem in the preparation process; in addition, polylactic acid and polybutylene succinate are selected as raw materials, so that the full-degradable environment-friendly material can be fully degraded, and the final product is carbon dioxide and water, so that the requirement of sustainable development is met.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the structure of a melt-blown nonwoven apparatus used in example 1 of the present invention;
FIG. 2 is a schematic illustration of the formation of different structures of polylactic acid-blended meltblown fibers;
FIG. 3 is a SEM image of the cross-sectional morphology of the polylactic acid blend meltblown fibers prepared in examples 1-3; wherein FIG. 3a is an SEM image of the meltblown fibers produced in example 1 parallel to the fiber direction; FIG. 3b is an SEM image of a meltblown fiber produced according to example 2 parallel to the direction of the fibers; FIG. 3c is an SEM image of a meltblown fiber produced according to example 3 parallel to the direction of the fibers; FIG. 3d is an SEM image of a meltblown fiber produced according to example 1 perpendicular to the direction of the fibers; FIG. 3e is an SEM image of the meltblown fibers produced in example 2 perpendicular to the direction of the fibers; FIG. 3f is an SEM image of a meltblown fiber produced according to example 3, perpendicular to the direction of the fibers.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
Example 1
Referring to fig. 1, a method for preparing a high-strength and high-toughness polylactic acid melt-blown nonwoven material comprises the following steps:
s1, drying a polylactic acid slice with a weight average molecular weight of 70000 and a polybutylene succinate slice with a weight average molecular weight of 65000 for 24 hours at a temperature of 50 ℃ under a vacuum condition, and then weighing 8kg of the dried polylactic acid slice and 2kg of the polybutylene succinate slice, and premixing for 20 minutes in a high-speed mixer;
s2, injecting the premixed slices into a double-screw extruder for melting, extruding the premixed slices into melt trickles through a metering pump and a clothes hanger type die head, wherein the temperatures of four temperature areas of the double-screw extruder are 170 ℃,190 ℃,215 ℃ and 250 ℃ in sequence, the temperature of the clothes hanger type die head is 250 ℃, and the extrusion amount is 40g/min;
and S3, placing the extruded melt trickle under high-temperature high-speed air flow with the temperature of 260 ℃ and the speed of 150m/S to form fibers, and self-bonding a net by utilizing the waste heat of a fiber skin layer on a receiving device with the receiving distance of 10cm to obtain the polylactic acid melt-blown nonwoven material.
The process flow chart of the production process of the high-strength high-toughness polylactic acid melt-blown non-woven material is shown in fig. 1, and the marks in fig. 1 have the following meanings: 1. a feed inlet; 2. a motor; 3. a twin screw extruder; 4. a filter; 5. a metering pump; 6. a hanger-type die head; 7. a spinneret orifice; 8. a gas hole; 9. a receiving device.
SEM observations were made on the morphology of the (polylactic acid) melt-blown (nonwoven) fibers prepared in this example, both parallel to the fiber direction and perpendicular to the fiber direction, as shown in fig. 3a and 3 d. As can be seen from the results of fig. 3a and 3d, the (polylactic acid) melt-blown (nonwoven) fiber prepared in the examples has an in-situ microfiber structure (see fig. 2), i.e., polybutylene succinate exists in the form of microfibers in the polylactic acid matrix. The nonwoven material had a machine direction strength of 65N/5cm and an elongation at break of 24.62% measured according to standard GB/T3923.1-2013.
Example 2
The preparation method of the high-strength high-toughness polylactic acid melt-blown nonwoven material comprises the following steps:
s1, drying a polylactic acid slice with a weight average molecular weight of 70000 and a polybutylene succinate slice with a weight average molecular weight of 65000 for 24 hours at a temperature of 50 ℃ under a vacuum condition, weighing 5kg of the dried polylactic acid slice and 5kg of the polybutylene succinate slice, and premixing for 20 minutes in a high-speed mixer;
s2, injecting the premixed slices into a double-screw extruder for melting, extruding the premixed slices into melt trickles through a metering pump and a clothes hanger type die head, wherein the temperatures of four temperature areas of the double-screw extruder are 170 ℃,190 ℃,215 ℃ and 250 ℃ in sequence, the temperature of the clothes hanger type die head is 260 ℃, and the extrusion amount is 50g/min;
and S3, placing the extruded melt trickle under air flow with the temperature of 280 ℃ and the speed of 220m/S to form fibers, and self-bonding a synthetic net by utilizing the waste heat of a fiber skin layer on a receiving device with the receiving distance of 10cm to obtain the polylactic acid melt-blown nonwoven material.
SEM observations were made on the morphology of the prepared (polylactic acid) meltblown (nonwoven) fibers parallel to the fiber direction and perpendicular to the fiber direction, as shown in fig. 3b and 3 e. As can be seen from the results of fig. 3b and 3e, the (polylactic acid) melt-blown (nonwoven) fiber obtained in this example has a two-phase continuous structure (see fig. 2), i.e., polybutylene succinate and polylactic acid penetrate each other to form a network structure. The nonwoven material had a machine direction strength of 53N/5cm and an elongation at break of 40.54% measured according to standard GB/T3923.1-2013.
Example 3
The preparation method of the high-strength high-toughness polylactic acid melt-blown nonwoven material comprises the following steps:
s1, taking a polylactic acid slice with a weight average molecular weight of 70000 and a polybutylene succinate slice with a weight average molecular weight of 65000, and drying under a vacuum condition at a drying temperature of 50 ℃ for 24 hours;
s2, taking 4kg of dried polylactic acid slices and 6kg of polybutylene succinate slices, and premixing the dried polylactic acid slices and the 6kg of polybutylene succinate slices in a high-speed mixer for 20min;
s3, injecting the premixed slices into a double-screw extruder for melting, extruding the premixed slices into melt trickles through a metering pump and a hanger type melt-blowing die head, wherein the temperatures of four temperature areas of the extruder are 170 ℃,190 ℃,215 ℃ and 250 ℃ in sequence, the temperature of the hanger type die head is 250 ℃, and the extrusion amount is 60g/min;
s4, placing the extruded melt trickle under the air flow with the temperature of 270 ℃ and the speed of 180m/S to form fibers, and self-adhering the fibers on a receiving device with the receiving distance of 10cm by using the waste heat of the fiber skin layer to form a net so as to obtain the polylactic acid melt-blown nonwoven material.
SEM observations were made on the morphology of the prepared (polylactic acid) meltblown (nonwoven) fibers parallel to the fiber direction and perpendicular to the fiber direction, as shown in fig. 3c and 3 f. As can be seen from the results of fig. 3c and 3f, the (polylactic acid) melt-blown (nonwoven) fiber obtained in this example has a sea-island structure (see fig. 2), i.e., polylactic acid exists in the form of spherical droplets in the polybutylene succinate matrix. The nonwoven material had a machine direction strength of 21N/5cm and an elongation at break of 4.49% measured according to standard GB/T3923.1-2013.
Comparative example 1
Substantially the same as in example 1, except that the content of the polylactic acid chips was 2kg and the content of the polybutylene succinate chips was 8.5kg.
Experimental results: it is difficult to form continuous fibers, and spinning is impossible; the temperature of the die head and the air flow are further increased to 265 ℃ and 285 ℃ respectively, and the polylactic acid blending melt-blown non-woven material obtained on the receiving device with the receiving distance of 10cm has a plurality of material points caused by fibers with insufficient drafting.
The resulting nonwoven material had a machine direction strength of 5N/5cm and an elongation at break of 1.01% measured according to standard GB/T3923.1-2013. The results of this comparative example demonstrate that: when the proportion of polybutylene succinate is large, melt extrusion is difficult in the spinning temperature range of the pure polylactic acid melt-blown nonwoven material, and the spinnability is poor.
Comparative example 2
Substantially the same as in example 2 was found except that the air flow rate was 300m/s.
Experimental results: meltblown nonwoven materials have little strength.
The results of this comparative example demonstrate that: when the air flow speed is too high, long fibers cannot be formed, and spinnability is poor.
Comparative example 3
Substantially the same procedure as in example 3 was repeated except that the temperature of the gas stream was 235 ℃.
Experimental results: the fibers are thicker and the doubling is severe, making the meltblown nonwoven stiffer to the touch.
The results of this comparative example demonstrate that: when the air flow temperature is too low, the polymer is not drawn sufficiently and the resulting meltblown nonwoven is less skin friendly.
Comparative example 4
S1, drying a polylactic acid slice with a weight average molecular weight of 70000 for 24 hours at a temperature of 50 ℃ under a vacuum condition;
s2, weighing 10 kg of dried polylactic acid slices, injecting the 10 kg of dried polylactic acid slices into a double-screw extruder for melting, extruding the slices into melt trickles through a metering pump and a clothes hanger type die head, wherein the temperatures of four temperature areas of the extruder are 170 ℃,190 ℃,215 ℃ and 250 ℃ in sequence, the temperature of the clothes hanger type die head is 250 ℃, and the extrusion amount is 50g/min;
s3, forming fibers by the extruded melt trickle under the action of air flow with the temperature of 270 ℃ and the speed of 150m/S, and self-bonding the fibers into a net by utilizing the waste heat of a fiber skin layer on a receiving device with the receiving distance of 10cm to obtain the polylactic acid melt-blown nonwoven material.
The nonwoven material had a machine direction strength of 14N/5cm and an elongation at break of 1.28% measured according to standard GB/T3923.1-2013. Comparative example 4 illustrates: the strength and toughness of the pure polylactic acid melt blown nonwoven materials are poor.
The present invention is not limited to the above-described specific embodiments, and various modifications may be made by those skilled in the art without inventive effort from the above-described concepts, and are within the scope of the present invention.
Claims (10)
1. A method for preparing a high-strength and high-toughness degradable melt-blown nonwoven material, which is characterized by comprising the following steps:
s1, premixing: taking polylactic acid slices and polybutylene succinate slices as raw materials, and premixing under certain conditions to obtain polylactic acid/polybutylene succinate premixed slices;
s2, melt blending: injecting the prepared polylactic acid/polybutylene succinate premixed slice into a double-screw extruder for melting, and extruding into a trickle melt through a metering pump and a clothes hanger die head;
s3, hot melt molding: and (3) stretching and shearing the prepared trickle melt by high-temperature high-speed airflow to obtain fibers, and collecting the fibers by a receiving device through a self-adhesive synthetic net to obtain the polylactic acid melt-blown nonwoven material.
2. The method of claim 1, wherein in step S1, the polylactic acid chips and the polybutylene succinate chips are dried before premixing.
3. The method for preparing a high-strength and high-toughness degradable melt-blown nonwoven material according to claim 2, wherein the drying treatment condition is vacuum drying, the temperature of the vacuum drying is 40-100 ℃, and the time of the vacuum drying is 12-72h.
4. The method of claim 1, wherein in step S1, the temperature of the premixing is room temperature and the premixing time is 10-40min.
5. The method for preparing a high-strength and high-toughness degradable melt-blown nonwoven material according to claim 1, wherein in the step S2, the screw extruder is divided into four temperature zones, and the temperatures of the four temperature zones are respectively: 170-200deg.C, 180-210 deg.C, 190-230 deg.C, 220-250deg.C.
6. The method of producing a high strength, high toughness, degradable meltblown nonwoven material according to claim 1, wherein in step S2, the temperature of the hanger die is 230-260 ℃; the melt extrusion amount of the combined device of the double-screw extruder and the clothes hanger type die head is 20-90g/min.
7. The method according to claim 1, wherein in the step S3, the temperature of the high-speed high-temperature air flow is 240-290 ℃, the speed of the high-speed high-temperature air flow is 100-300m/S, and the receiving distance of the receiving device is 5-40cm.
8. The preparation method of the high-strength high-toughness degradable melt-blown nonwoven material according to claim 1, wherein the mass part ratio of the polylactic acid slices to the polybutylene succinate slices is 20-95:5-80.
9. The high-strength and high-toughness polylactic acid melt-blown nonwoven material prepared by the preparation method according to any one of claims 1 to 8, wherein the high-strength and high-toughness polylactic acid melt-blown nonwoven material is any one of an in-situ microfiber structure, a two-phase continuous structure or an island structure, and the average diameter of the high-strength and high-toughness polylactic acid melt-blown nonwoven material is 3 to 15 μm.
10. The use of the high strength, high toughness polylactic acid melt blown nonwoven material according to claim 9 in filtration and protection applications.
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