CN115559018A - High-strength polyolefin fiber and preparation method thereof - Google Patents
High-strength polyolefin fiber and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000009826 distribution Methods 0.000 claims abstract description 52
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims abstract description 40
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- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 2
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Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/06—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyolefin as constituent
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Artificial Filaments (AREA)
Abstract
The invention provides a high-strength polyolefin fiber and a preparation method thereof. The high-strength polyolefin fiber comprises polyolefin, bimodal distribution ultrahigh molecular weight polyethylene and a nano filler auxiliary agent, wherein the bimodal distribution ultrahigh molecular weight polyethylene has two characteristic peaks which comprise a peak A and a peak B; peak A has a peak value of 10 2 ～10 4 The molecular weight distribution is 2-20; peak B has a peak value of 10 4 ～10 7 The molecular weight distribution is 1-15. The bimodal distribution of ultra-high molecular weight polyethylene improves the melt fluidity in the preparation process of polyolefin fibers and the mechanical properties of fiber products. The invention successfully prepares the high-strength polyolefin fiber by adding bimodal distribution ultrahigh molecular weight polyethylene into polyolefin and then spinning.
Description
Technical Field
The invention relates to a fiber and a preparation method thereof, in particular to a high-strength polyolefin fiber and a preparation method thereof.
Background
Polyolefin fibers refer to synthetic fibers composed of linear macromolecules polymerized from olefins. Common polyolefin fibers can be classified into polyethylene fibers, polypropylene fibers, and the like. The polyolefin fiber is a light fiber, has high strength and good wear resistance, and has strong sunlight and weather resistance. The polypropylene fiber has the advantages of good toughness, good chemical resistance and antimicrobial property, low price and the like, so the polypropylene fiber is widely used in the industrial fields of ropes, fishing nets, safety belts, box and bag belts, safety nets, sewing threads, cable jackets, geotextiles, filter cloth, felts for papermaking, reinforcing materials of paper and the like. The polypropylene fibers are spun from polypropylene having low strength and low viscosity. Although the polypropylene fiber has high productivity, the strength is low, and the application scenes of the polypropylene fiber are limited. The polyethylene fiber is spun from polyethylene with high strength and high viscosity. The high-viscosity polyethylene limits the productivity of the polyethylene fiber, and the melt viscosity of the polyethylene fiber is increased sharply with the increase of the molecular weight of the polyethylene, so that the processing and the production of the polyethylene fiber are difficult. The medium and low molecular weight polyethylene fiber is used for manufacturing ropes, fishing nets, filter cloth and packaging bags; ultra-high molecular weight polyethylene is used in the manufacture of ballistic armor and ballistic articles, cut-resistant fabrics, cables, and fishing nets.
The mechanical properties and melt processability of polyethylene are often contradictory, and increasing the molecular weight of polyethylene can enhance the mechanical properties, such as toughness, tensile strength and the like, but also can cause the processability to be poor, and the problems of overhigh melt viscosity or melt breakage and the like occur. Lowering the molecular weight improves flowability and processability, but the lower molecular weight results in lower fiber strength. Therefore, the common unimodal polyethylene has difficulty in balancing processing performance and mechanical properties.
Therefore, how to prepare a high-strength polyolefin fiber by a melt spinning method, which is a fiber production method with high efficiency, low pollution and low cost, becomes a problem to be solved in the field of polyolefin fibers.
Disclosure of Invention
The invention aims to overcome the defects of the existing materials and technologies and provide high-strength polyolefin and a preparation method thereof. By adding polyethylene with double/multi-peak wide distribution molecular weight into polyolefin material and spinning the polyethylene, the relation between mechanical property and processability can be balanced, the high molecular weight part ensures good mechanical property, and the low molecular weight part improves processability.
According to the high-strength polyolefin fiber, the raw materials with the formula amount are uniformly mixed, extruded and granulated, and then spun to prepare the high-strength polyolefin fiber; the raw material formula is as follows: 100 parts of polyolefin, 10-100 parts of bimodal distribution ultrahigh molecular weight polyethylene and 0-20 parts of nano filler;
the nano filler comprises one or more of nano calcium carbonate, graphene and carbon nano tubes;
the bimodal distribution ultra high molecular weight polyethylene has a bimodal distribution comprising a peak A and a peak B;
the peak A had a weight average molecular weight of 10 2 ～10 4 g/mol, the molecular weight distribution is 2-20;
the peak value of the weight average molecular weight of the peak B is 10 4 ～10 7 g/mol, and the molecular weight distribution is 1-15.
As a preferable scheme of the invention, the adding amount of the bimodal distribution ultrahigh molecular weight polyethylene in the raw material formula is preferably 20-90 parts by weight, preferably 30-60 parts by weight, preferably 45-50 parts by weight; typically, but not limited to, the bimodal distribution ultra high molecular weight polyethylene can be added in the feed formulation in an amount of 10, 20, 30, 40, 45, 50, 60, 90 parts by weight.
In a preferred embodiment of the present invention, the amount of the nanofiller added to the raw material formulation is preferably 2 to 15 parts by weight, preferably 2.5 to 10 parts by weight, and more preferably 5 to 7.5 parts by weight. The nano-filler is selected from nano inorganic filler and is mainly used for improving the melt conveying efficiency.
Further, the crossing range of the peak a and the peak B is less than 5% of the sum of their areas, preferably less than 3% of the sum of their areas, further preferably less than 1%, further preferably no crossing.
The polyolefin is one or more of low density polyethylene, linear low density polyethylene, high density polyethylene, ultrahigh molecular weight polyethylene, homo-polypropylene, co-polypropylene and block polypropylene.
The raw materials further comprise 0-5 parts of antioxidant, 0-5 parts of age resister, 0-5 parts of lubricant, 0-50 parts of reinforcing filler and 0-10 parts of color master batch, and the use amounts of the raw materials are not 0 at the same time. The auxiliary agent is mainly used for improving the compatibility of polyolefin and bimodal distribution ultrahigh molecular weight polyethylene, improving the fluidity and mechanical strength and improving the melt conveying efficiency.
The strength of the high-strength polyolefin fiber is 5 cN/dtex-30 cN/dtex, and the initial storage modulus range is 1.0 multiplied by 10 5 ～8.0×10 5 Pa. The preparation method of the high-strength polyolefin fiber comprises the following steps: the raw materials are uniformly mixed in a high-speed mixer, and then are granulated in an extrusion working section and are formed into long fibers in a spinning working section.
Specifically, the method comprises the following steps:
s1, uniformly mixing polyolefin, bimodal distribution ultrahigh molecular weight polyethylene, nano filler and antioxidant in proportion at room temperature, and mixing by using a high-speed mixer.
And S2, feeding the blended raw materials into a double-screw extruder from a feeder, and blending and granulating at a certain temperature.
And S3, the granules obtained by granulation enter a screw extruder from a hopper, are melted and are pushed by a screw to be sent into a spinning box body through a guide pipe. Then the polyolefin melt enters a metering pump, is metered and conveyed to a spinning nozzle (plate), the melt trickle extruded from a spinning hole meets cold air in a spinning window for cooling and solidification, and then is stretched by a hot drawing process, and is wound on a bobbin by a winding mechanism after being oiled, so that the ultrahigh molecular weight polyethylene fiber with the strength of 10-30 cN/dtex is obtained.
The extrusion section is extruded by one of a double-screw extruder, a single-screw extruder and a plunger type extruder, and the temperature of each section of the screw is 160-300 ℃.
The aperture of the melt spinning spinneret plate is 0.2-2.0 mm, the temperature of the spinning melt is controlled at 180-350 ℃, and the drawing multiple is 5-100 times.
The invention also provides a fabric, which comprises the high-strength polyolefin fiber.
Compared with the existing product, the invention has the following beneficial effects:
(1) The high-strength polyolefin fiber provided by the invention has the strength of 5 cN/dtex-30 cN/dtex, and can be spun by using common melt spinning equipment. The high-strength polyolefin fiber provided by the invention is innovatively added with the bimodal distribution ultra-high molecular weight polyethylene auxiliary agent capable of simultaneously improving the flowability and the fiber strength of the processing raw material. The low molecular weight part in the bimodal distribution ultrahigh molecular weight polyethylene can help the polyolefin chain end to diffuse quickly and enter a crystallization area, so that the bimodal distribution ultrahigh molecular weight polyethylene not only has the function of serving as a lubricant, but also accelerates the establishment of interfacial entanglement and improves the mechanical property of the material, the high molecular weight part serves as a matrix, and the high-strength entanglement network greatly improves the mechanical property of the fiber. Furthermore, the high-strength polyolefin fiber can be added with nano-filler in the production process, so that the melt conveying efficiency is further improved.
(2) The antioxidant and the nano inorganic filler aid are added during blending, so that the oxidation resistance and the compatibility of polyolefin and bimodal distribution ultrahigh molecular weight polyethylene are synchronously improved, the fluidity and the mechanical strength of a mixture are improved, and the melt conveying efficiency is improved.
Drawings
FIG. 1 is a GPC chart of preparation example A1 of the present invention.
FIG. 2 is a GPC chart of preparation example A2 of the present invention.
FIG. 3 is a GPC chart of preparation example A3 of the present invention.
FIG. 4 is a GPC chart of preparation example A4 of the present invention.
FIG. 5 is a GPC chart of preparation example A5 of the present invention.
FIG. 6 is a GPC chart of preparation example B1 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Preparation example
The bimodal distribution ultra high molecular weight polyethylene is prepared by the following steps, and polyethylene with different molecular weights and molecular weight distributions, marked as A1-A5, is obtained according to different experimental conditions. The correspondence between the experimental conditions and the products A1 to A5 is shown in Table 1. A1 to A5 are carried out in the following common steps.
(1) Adding polyethylene low polymer with the weight-average molecular weight of 1000g/mol and heptane into a reactor in proportion, and stirring to uniformly mix the polyethylene low polymer and the heptane to obtain a mixed solution; the polyethylene low polymer and the heptane are in proportion that the polyethylene low polymer accounts for 30 parts by weight and the polymerization solvent accounts for 100 parts by weight;
(2) Adding a cocatalyst, a catalyst and an ethylene polymerization monomer into a reactor, and carrying out polymerization reaction at the reaction temperature of 40-200 ℃, the polymerization time of 1-600min and the polymerization pressure of 5-50bar, thereby preparing the ultra-wide molecular weight distribution polyethylene;
replacing the polyethylene low polymer with the weight-average molecular weight of 1000g/mol in the step (1) with the polyethylene low polymer with the weight-average molecular weight of 1 multiplied by 10 5 g/mol, the experimental conditions are shown in Table 1, the rest of the procedure is the same as for the preparation of A1 to A5, and the product obtained is designated B1. The GPC charts of the products A1, A2, A3, A4, A5 and B1 obtained in the respective preparative examples are shown in FIGS. 1 to 6, respectively.
TABLE 1
TABLE 2
Examples 1 to 5
40kg of a weight-average molecular weight of 6X 10 was added at room temperature 5 g/mol of ultrahigh-molecular-weight polyethylene, the bimodal distribution of ultrahigh-molecular-weight polyethylene as shown in preparation example A1 in parts by weight in Table 3, and 0.3kg of antioxidant 1010 were put into a high-speed mixer, and mixed at a rotation speed of 40rpm for 5 minutes. And then, granulating through a double-screw extruder to obtain granules for spinning.
The pellets are fed into a screw extruder through a hopper. The pellets were melted by heating at 200 ℃ and pushed by a screw to be fed into a spinning beam through a guide pipe. The melt enters a spinning metering pump, then is conveyed to a spinning nozzle (plate) with the aperture of 1.0mm, the melt trickle extruded from the spinning nozzle meets cold air in a spinning window for cooling and solidification, then is stretched by a hot drawing process, and is wound on a bobbin by a winding mechanism after oiling at the spinning speed of 1000m/min.
And (3) hot drawing process: the temperature of the primary raw silk in the first group of hot rollers is 50 ℃; the temperature of the second group of hot rollers is 60 ℃; the temperature of the third group of hot rollers is 70 ℃; and (3) carrying out a hot drawing process under the condition that the temperature of the fourth group of hot rollers is 80 ℃, wherein the drawing multiple is 50 times, and winding the oiled hot rollers on a bobbin by a winding mechanism to obtain the ultrahigh molecular weight polyethylene fiber.
The ultra-high molecular weight polyethylene fiber products prepared in examples 1 to 5 were numbered 1 to 5, and the properties are shown in Table 3
Characterization methods of polymer and fiber structure and properties:
(1) Density: measured according to the method GB/1033-1986.
(2) Tensile strength, young's modulus and elongation at break: determined according to GB/T14344-2008.
(3) Weight average molecular weight and molecular weight distribution: measured by high temperature permeation gel chromatography HT-GPC
(4) Melting point and crystallinity: and measuring by using a differential scanning calorimeter DSC.
(5) The linear density of the fibers was determined according to GB/T14343-2008
(6) Melt index: the melt flow rate was determined according to GB/T-3682-2000 conditions (190 ℃ C., load of 12.5 kg) and is generally designated MI12.5.
Comparative example 1
The weight of the A1 was set to 2kg based on example 1, and the other conditions were not changed. The properties are shown in Table 3.
Comparative example 2
The weight of the A1 was set to 50kg based on example 1, and other conditions were not changed. The properties are shown in Table 3.
TABLE 3
Examples 6 to 9
40kg of a weight-average molecular weight of 6X 10 was added at room temperature 5 g/mol of ultrahigh molecular weight polyethylene, 20kg of bimodal distribution type ultrahigh molecular weight polyethylene shown in Table 4, 1kg of graphene and 0.3kg of antioxidant 1010 were put into a high-speed mixer, and mixed for 5 minutes at a rotation speed of 40 rpm. And then, granulating through a double-screw extruder to obtain granules for spinning.
The pellets are fed into a screw extruder through a hopper. The pellets were melted by heating at 200 ℃ and pushed by a screw to be fed into a spinning beam through a guide pipe. The melt enters a spinning metering pump, then is conveyed to a spinning nozzle (plate) with the aperture of 1.0mm, the melt trickle extruded from the spinning nozzle meets cold air in a spinning window for cooling and solidification, then is stretched by a hot drawing process, and is wound on a bobbin by a winding mechanism after oiling at the spinning speed of 1000m/min.
And (3) hot drawing process: the temperature of the primary raw silk in the first group of hot rollers is 50 ℃; the temperature of the second group of hot rollers is 60 ℃; the temperature of the third group of hot rollers is 70 ℃; and (3) carrying out a hot drawing process under the condition that the temperature of the fourth group of hot rollers is 80 ℃, wherein the drawing multiple is 50 times, and winding the oiled hot rollers on a bobbin by a winding mechanism to obtain the ultrahigh molecular weight polyethylene fiber.
The ultra high molecular weight polyethylene fiber products prepared from examples 6-9 were numbered 6-9 and the properties are shown in Table 4.
Comparative example 3
On the basis of example 6, the bimodal distribution of ultrahigh molecular weight polyethylene was replaced by a unimodal distribution of polyethylene having a weight average molecular weight of 500g/mol, the other conditions remaining unchanged.
Comparative example 4
On the basis of example 6, the bimodal distribution of ultrahigh molecular weight polyethylene was replaced by a monomodal distribution of polyethylene having a weight average molecular weight of 100000g/mol, the other conditions remaining unchanged.
Comparative example 5
On the basis of example 6, the bimodal distribution ultrahigh molecular weight polyethylene was replaced by a monomodal distribution polyethylene having a weight average molecular weight of 3000000g/mol, the other conditions remaining unchanged. Since the melt index of the monomodal distribution high molecular weight polyethylene was 0g/10min, the melt index of the mixture after addition of the unimodal distribution polyethylene having a weight average molecular weight of 3000000g/mol was 0.001g/10min, and spinning was not possible.
Comparative example 6
The bimodal distribution ultra-high molecular weight polyethylene was replaced with the bimodal distribution ultra-high molecular weight polyethylene described in preparation example B1 on the basis of example 6, and the other conditions were unchanged.
The first peak of the bimodal polyethylene B1 which is not in the protective range is 10 4.1 The molecular weight distribution is 1.8; the second peak value is 10 4.9 The molecular weight distribution was 2.1.
TABLE 4
It can be seen from tables 3 and 4 that the strength of the polyolefin fiber can be greatly improved by adding the bimodal distribution ultra-high molecular weight polyethylene, the low molecular weight part in the bimodal distribution ultra-high molecular weight polyethylene can help the polyolefin chain ends to rapidly diffuse and enter the crystallization area, the bimodal distribution ultra-high molecular weight polyethylene not only serves as a lubricant, but also accelerates the establishment of interface entanglement, improves the mechanical property of the material, the high molecular weight part serves as a matrix, and the high-strength entanglement network greatly improves the mechanical property of the fiber.
In comparative example 1, the bimodal distribution ultra-high molecular weight polyethylene was added in a small amount and failed to provide a significant reinforcing effect. In comparative example 2, the disadvantage of the bimodal distribution ultra-high molecular weight polyethylene is shown due to too large addition amount, and the bimodal distribution ultra-high molecular weight polyethylene is too much entangled in the melting process, so that the spinning is not smooth, and the strength of the obtained fiber is lost.
Comparative examples 3 and 4 each used a portion of the bimodal distribution high molecular weight polyethylene, and it can be seen from the data in table 4 that the addition of only the component corresponding to one of the molecular weight peaks of the bimodal distribution high molecular weight polyethylene was insufficient to achieve the aforementioned lubricating and entanglement-promoting effects, thereby obtaining high strength polyolefin fibers. And in comparative example 5, spinning was difficult due to its excessive viscosity. In comparative example 6, the high molecular weight polyethylene was also bimodal, but the peaks A and B were greatly crossed in the GPC chart, and the reinforcing effect of the obtained fiber was not significant. The possible reasons are that the middle-stage molecular weight polyethylene is insufficient to promote lubricity and to contribute to the entanglement network, and the medium-molecular weight polyethylene base material is insufficiently entangled, resulting in a reduction in its strength.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. The high-strength polyolefin fiber is characterized in that the high-strength polyolefin fiber is prepared by uniformly mixing raw materials according to a formula amount, extruding and granulating the raw materials and then spinning the raw materials; the raw material formula is as follows: 100 parts of polyolefin, 10-100 parts of bimodal distribution ultrahigh molecular weight polyethylene and 0-50 parts of nano filler;
the bimodal distribution ultra high molecular weight polyethylene has a bimodal distribution comprising a peak A and a peak B;
the peak A had a weight average molecular weight of 10 2 ～10 4 g/mol, the molecular weight distribution is 2-20;
the peak weight average molecular weight of the peak B is 10 4 ～10 7 g/mol, the molecular weight distribution is 1-15;
the nano filler comprises one or more of nano calcium carbonate, graphene and carbon nano tubes.
2. The high strength polyolefin fiber according to claim 1, wherein said bimodal distribution ultra high molecular weight polyethylene is added in an amount of 10 to 90 parts by weight, preferably 30 to 60 parts by weight, preferably 45 to 50 parts by weight in the raw material formulation.
3. The high strength polyolefin fiber according to claim 1, characterized in that the crossing range of the peaks a and B is less than 5% of the sum of their areas, preferably less than 3% of the sum of their areas, further preferably less than 1%, further preferably no crossing.
4. A high strength polyolefin fiber as claimed in any one of claims 1 to 3, wherein said polyolefin is one or more of low density polyethylene, linear low density polyethylene, high density polyethylene, homo polypropylene, co-polypropylene, block polypropylene.
5. The high strength polyolefin fiber according to any one of claims 1 to 3, further comprising 0 to 5 parts by weight of antioxidant, 0 to 5 parts by weight of anti-aging agent, 0 to 5 parts by weight of lubricant, 0 to 50 parts by weight of reinforcing filler, and 0 to 10 parts by weight of color masterbatch, wherein the amounts of the above raw materials are not 0 at the same time.
6. The high strength polyolefin fiber according to any one of claims 1 to 3, wherein said high strength polyethylene fiber has a strength of 5cN/dtex to 30cN/dtex and an initial storage modulus in the range of 1.0 x 10 5 ～8.0×10 5 Pa。
7. The preparation method of high strength polyolefin fiber according to claim 1, characterized in that the raw materials with formula amount are mixed uniformly in a high speed mixer, pelletized by an extrusion section, and formed into long fiber by a spinning section;
the extrusion section is extruded by one of a double-screw extruder, a single-screw extruder and a plunger type extruder, and the temperature of each section of the screw is 160-300 ℃.
8. The method of claim 7 wherein the melt spinning spinneret has a pore size of 0.2-2.0 mm, a melt temperature of 180-350 ℃, and a draft ratio of 5-100.
9. A fabric comprising the high strength polyolefin fiber according to any one of claims 1 to 6 or the high strength polyolefin fiber obtained by the method of producing the high strength polyolefin fiber according to any one of claims 7 to 8.
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