CN114456493B - Electret master batch and preparation method and application thereof - Google Patents
Electret master batch and preparation method and application thereof Download PDFInfo
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- CN114456493B CN114456493B CN202210212996.7A CN202210212996A CN114456493B CN 114456493 B CN114456493 B CN 114456493B CN 202210212996 A CN202210212996 A CN 202210212996A CN 114456493 B CN114456493 B CN 114456493B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
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- 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
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- 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
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
- D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
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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
- D04H1/42—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 characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4282—Addition polymers
- D04H1/4291—Olefin series
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2479/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2461/00 - C08J2477/00
- C08J2479/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
- C08K5/134—Phenols containing ester groups
- C08K5/1345—Carboxylic esters of phenolcarboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/20—Carboxylic acid amides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/49—Phosphorus-containing compounds
- C08K5/51—Phosphorus bound to oxygen
- C08K5/52—Phosphorus bound to oxygen only
- C08K5/524—Esters of phosphorous acids, e.g. of H3PO3
- C08K5/526—Esters of phosphorous acids, e.g. of H3PO3 with hydroxyaryl compounds
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- 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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- Medicinal Chemistry (AREA)
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Abstract
The invention provides a electret master batch and a preparation method and application thereof, wherein the electret master batch comprises the following components in parts by weight: 55-95 parts of polypropylene resin, 5-40 parts of a electret agent, 1-10 parts of an antistatic agent, 1.5-3 parts of a lubricant and 0.25-1.0 part of a thermo-oxidative aging resistant agent; the electret is selected from triazine copolymer, hindered amine copolymer and triazine copolymer; or a complex of a hindered amine copolymer and a fluorine compound. The invention adopts the copolymer of the above kind as the electret agent, and the prepared electret master batch and the melt-blown material are subjected to eutectic spraying to prepare the melt-blown cloth which has high filtration efficiency and low gas renting performance. The experimental results show that: the filter effect of the melt-blown cloth is up to 99%, and the minimum air resistance is 101Pa.
Description
Technical Field
The invention belongs to the technical field of electret master batches, and particularly relates to an electret master batch, a preparation method and application thereof.
Background
The common melt-blown polypropylene material has shorter static holding time and poorer ageing resistance, and the addition of electret material to the melt-blown polypropylene material for maintaining long static adsorption effect is one of the main methods in the industry at present.
The water flow friction melt-blown cloth is used for charging, so that the electrostatic adsorption capacity is achieved, particulate matters and viruses in the air can be filtered, and the electrostatic adsorption type air filter has been widely applied to respiratory protection and filtering materials. The electret effect can be improved by adding inorganic powder or rosin and wax substances, but the polypropylene electret material obtained by the prior art can have obvious charge attenuation under high-temperature and high-humidity environment, so that the electret durability is poor, and the filtration efficiency is reduced.
Disclosure of Invention
In view of the above, the invention aims to provide a electret master batch, a preparation method and application thereof, and the melt-blown cloth prepared by co-melting and spraying the electret master batch and the melt-blown material has high filtration efficiency and low air resistance.
The invention provides a electret master batch which comprises the following components in parts by weight:
55-95 parts of polypropylene resin, 5-40 parts of a electret agent, 1-10 parts of an antistatic agent, 1.5-3 parts of a lubricant and 0.25-1.0 part of a thermo-oxidative aging resistant agent;
the electret is selected from triazine copolymer, hindered amine copolymer and triazine copolymer compound; or a complex of a hindered amine and a fluorine-based compound.
The electret master batch provided by the invention is a high-temperature and high-humidity resistant auxiliary agent applicable to the water electret production process, has good charge retention capacity, can meet different environmental conditions, and has no obvious attenuation of filtration efficiency after being subjected to high-temperature and high-humidity environments. The polypropylene electret master batch obtained through the cooperation of the components has high fluidity, more stable volatile components and melt index, can adapt to a water electret processing technology, effectively improves the electret effect of the polypropylene melt-blown non-woven fabric produced by the electret master batch, has stable electret effect, improves the filtering efficiency, and has low filtering resistance.
In the present invention, the hindered amine copolymer in the electret is selected from the group consisting of poly { [6- [ (1, 3-tetramethylbutyl) amino ] ] -1,3, 5-triazine-2, 4- [ (2, 6, -tetramethyl-piperidinyl) imino ] -1, 6-hexamethylenediyl [ (2, 6-tetramethyl-4-piperidinyl) imino ] } (electret 944);
the triazine copolymer in the electret agent is selected from polymers of reaction products of N, N-bis (2, 6-tetramethyl-4-piperidyl) -1, 6-hexamethylenediamine and 2,4, 6-trichloro-1, 3, 5-triazine and N-butyl-1-butylamine and N-butyl-2, 6-tetramethyl-4-piperidylamine (the electret agent 2020);
the fluorine compound in the electret is selected from PTFE micropowder.
In a specific embodiment, the electret is selected from the group consisting of 5:1, 2020 and 944; or mass ratio 11:20, 2020 and 944; or mass ratio 1:1, 2020 and 944; or a mass ratio of 10:3 and PTFE; or 2020.
In the invention, the amount of the electret agent is preferably 20-35 parts; in specific embodiments, the amount of the electret agent is 31 parts, 40 parts, 24 parts, 21 parts, 13 parts, or 5 parts.
In the present invention, the melt flow rate of the polypropylene resin is not lower than 600g/10min at 230℃under a load of 2.16 Kg. In specific embodiments, the polypropylene resin has a flow rate of 600g/10min, or 800g/10min, or 900g/10min, or 1000g/10min.
In the present invention, the antistatic agent is selected from amides and/or stearamides;
the lubricant is selected from zinc stearate.
In the present invention, the anti-thermo-oxidative aging agent is selected from hindered amine antioxidants and/or phosphite antioxidants.
In the invention, the anti-thermo-oxidative aging agent is a compound of type 1010 and type 168 antioxidants; in a specific embodiment, the mass ratio of the model 1010 antioxidant to the model 168 antioxidant in the compound of the model 1010 antioxidant and the model 168 antioxidant is 1:1.
The invention provides a preparation method of the electret master batch, which comprises the following steps:
55-95 parts of polypropylene resin, 5-40 parts of electret agent, 1-10 parts of antistatic agent and 0.25-1.0 part of thermo-oxidative aging resistant agent are uniformly mixed, extruded and granulated to obtain the electret master batch.
The invention provides melt-blown cloth, which comprises 2-4 parts by weight of electret master batch and 100 parts by weight of melt-blown material;
the electret master batch is prepared by the above technical scheme or the preparation method.
In the invention, the melt-blown material comprises 99 parts by weight of polypropylene powder resin and 0.2 to 0.8 parts by weight of organic peroxide;
the melt flow rate of the polypropylene powder resin is not lower than 20g/10min under the conditions of 230 ℃ and 2.16Kg load;
the organic peroxide includes one or more of di-tert-butyl diisopropylbenzene peroxide, di-tert-butyl peroxide and bis (3, 5-trimethylacetyl) peroxide.
The prepared melt-blown non-woven fabric produced by mixing the electret master batch and the melt-blown polypropylene resin has the advantages of lasting electrostatic adsorption effect, excellent thermal attenuation resistance, no blockage of spinneret orifices and the like. And because the compatibility of the organic electret agent and the polypropylene base material is good, the fibrous structure of polypropylene in the melt-blowing process is not damaged by the addition of the organic electret agent, and the fibrous structure is kept good, so that the prepared non-woven fabric has small air resistance and excellent air permeability. The long-acting melt-blown polypropylene electret master batch provided by the invention can be widely applied to medical epidemic prevention products and air filtration products.
The invention provides a electret master batch which comprises the following components in parts by weight: 55-95 parts of polypropylene resin, 5-40 parts of a electret agent, 1-10 parts of an antistatic agent, 1.5-3 parts of a lubricant and 0.25-1.0 part of a thermo-oxidative aging resistant agent; the electret is selected from triazine copolymer, hindered amine copolymer and triazine copolymer compound; or a complex of a hindered amine copolymer and a fluorine compound. The invention adopts the copolymer of the above kind as the electret agent, and the prepared electret master batch and the melt-blown material are subjected to eutectic spraying to prepare the melt-blown cloth which has high filtration efficiency and low gas renting performance. The experimental results show that: the filter effect of the melt-blown cloth is up to 99%, and the minimum air resistance is 101 (Pa).
Detailed Description
For further explanation of the present invention, a electret master batch, a preparation method and application thereof provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
60 parts of PP resin with the melt index of 600, 6 parts of EBS (N, N' -ethylene bis stearamide), 2 parts of zinc stearate, 2020 11 parts and 944 parts of a electret agent and 1010.5 parts and 168.5 parts of a thermo-oxidative aging resistant agent are added. And (3) putting the raw material powder into a high-speed mixer, stirring at a low speed for 5 minutes, uniformly mixing, discharging into an extruder, and extruding and granulating to obtain the electret master batch particles.
Example 2
60 parts of PP resin with the melt index of 800, 10 parts of EBS, 2 parts of zinc stearate, 2020 20 parts of a electret agent and 944 20 parts of a thermo-oxidative aging resistant agent, 1010 0.5 parts and 168.5 parts are added. And (3) putting the raw material powder into a high-speed mixer, stirring at a low speed for 5 minutes, uniformly mixing, discharging into an extruder, and extruding and granulating to obtain the electret master batch particles.
Example 3
70 parts of PP resin with the melt index of 1000, 3 parts of EBS, 2 parts of zinc stearate, 2020 20 parts and 944 parts of a electret agent and 1010.5 parts and 168.5 parts of a thermo-oxidative aging resistant agent are added. And (3) putting the raw material powder into a high-speed mixer, stirring at a low speed for 5 minutes, uniformly mixing, discharging into an extruder, and extruding and granulating to obtain the electret master batch particles.
Example 4
70 parts of PP resin with the melt index of 1000, 6 parts of EBS, 2 parts of zinc stearate, 2020 21 parts of a electret agent and 1010.5 parts of a thermo-oxidative aging resistant agent, and 168.5 parts of a thermal-oxidative aging resistant agent are added. And (3) putting the raw material powder into a high-speed mixer, stirring at a low speed for 5 minutes, uniformly mixing, discharging into an extruder, and extruding and granulating to obtain the electret master batch particles.
Example 5
55 parts of PP resin with the melt index of 900, 2 parts of EBS, 2 parts of zinc stearate, 2020 20 parts of a electret agent and 944 20 parts of a thermo-oxidative aging resistant agent, 1010 0.5 parts and 168.5 parts are added. And (3) putting the raw material powder into a high-speed mixer, stirring at a low speed for 5 minutes, uniformly mixing, discharging into an extruder, and extruding and granulating to obtain the electret master batch particles.
Example 6
82 parts of PP resin with the melt index of 1200, 2 parts of EBS, 2 parts of zinc stearate, 944 parts of a electret agent and 3 parts of PTFE micro powder are added, and 1010.5 parts of a thermo-oxidative aging resistant agent and 168.5 parts are added. And (3) putting the raw material powder into a high-speed mixer, stirring at a low speed for 5 minutes, uniformly mixing, discharging into an extruder, and extruding and granulating to obtain the electret master batch particles.
Example 7
95 parts of PP resin with the melt index of 1000, 1 part of EBS, 2 parts of zinc stearate, 2020.5 parts of electret agent and 1010.5 parts of thermo-oxidative aging resistant agent are added. And (3) putting the raw material powder into a high-speed mixer, stirring at a low speed for 5 minutes, uniformly mixing, discharging into an extruder, and extruding and granulating to obtain the electret master batch particles.
According to the invention, the electret master batch particles prepared in the examples and the comparative examples are respectively mixed with melt blown materials according to the mass ratio of 3:100, and then performing eutectic spraying to obtain melt-blown cloth;
the melt-blown material is prepared by blending polypropylene powder resin and di-tert-butyl peroxide in a mass ratio of 99:0.4, and the melt index of the melt-blown material is 800g/10min; the melt flow rate of the polypropylene powder resin is not lower than 20g/10min under the conditions of 230 ℃ and 2.16Kg load.
The invention performs performance tests on the melt blown fabric, and the results are shown in Table 1:
TABLE 1 results of melt blown fabric Performance test
| Filtration efficiency% | Air resistance | |
| Example 1 | 85 | 139 |
| Example 2 | 99 | 104 |
| Example 3 | 99 | 101 |
| Example 4 | 99 | 110 |
| Example 5 | 98 | 107 |
| Example 6 | 99 | 103 |
| Example 7 | 68 | 113 |
As can be seen from the data in Table 1, the adoption of 2020 and 944 can obviously improve the filtering performance of the material, the filtering effect can reach more than 99%, and meanwhile, the low air resistance is maintained; the two materials are compounded for use, and have synergistic effect, so that the filter material with high filtering efficiency, low air resistance and excellent performance is obtained.
As can be seen from the above examples, the invention provides a electret master batch, which comprises the following components in parts by weight: 55-95 parts of polypropylene resin, 5-40 parts of a electret agent, 1-10 parts of an antistatic agent, 1.5-3 parts of a lubricant and 0.25-1.0 part of a thermo-oxidative aging resistant agent; the electret is selected from triazine copolymer, hindered amine copolymer and triazine copolymer compound; or a complex of a hindered amine copolymer and a fluorine compound. The invention adopts the copolymer of the above kind as the electret agent, and the prepared electret master batch and the melt-blown material are subjected to eutectic spraying to prepare the melt-blown cloth which has high filtration efficiency and low gas renting performance. The experimental results show that: the filter effect of the melt-blown cloth is up to 99%, and the minimum air resistance is 101 (Pa).
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (5)
1. The electret master batch comprises the following components in parts by weight:
55-95 parts of polypropylene resin, 5-40 parts of a electret agent, 1-10 parts of an antistatic agent, 1.5-3 parts of a lubricant and 0.25-1.0 part of a thermo-oxidative aging resistant agent;
the electret agent is selected from the following materials in mass ratio of 5:1 and a complex of a electret 2020 and an electret 944; or mass ratio 1:1 and a complex of a electret 2020 and an electret 944; or a mass ratio of 10:3, a complex of a polar agent 944 and PTFE; the electret 944 is poly { [6- [ (1, 3-tetramethylbutyl) amino ] ] -1,3, 5-triazine-2, 4- [ (2, 6, -tetramethyl-piperidinyl) imino ] -1, 6-hexamethylenediyl [ (2, 6-tetramethyl-4-piperidinyl) imino ] };
the electret 2020 is a polymer of the reaction product of N, N-bis (2, 6-tetramethyl-4-piperidinyl) -1, 6-hexamethylenediamine with 2,4, 6-trichloro-1, 3, 5-triazine and N-butyl-1-butylamine and N-butyl-2, 6-tetramethyl-4-piperidinamine;
the antistatic agent is selected from amides and/or stearamides;
the lubricant is selected from zinc stearate;
the anti-thermo-oxidative aging agent is a compound of 1010 and 168 antioxidant.
2. The electret master batch according to claim 1, wherein the polypropylene resin has a melt flow rate of not less than 600g/10min at 230 ℃ under a load of 2.16 Kg.
3. A method of preparing the electret master batch of any one of claims 1-2, comprising the steps of:
55-95 parts of polypropylene resin, 5-40 parts of electret agent, 1-10 parts of antistatic agent and 0.25-1.0 part of thermo-oxidative aging resistant agent are uniformly mixed, extruded and granulated to obtain the electret master batch.
4. A meltblown fabric comprising 2-4 parts by weight of electret master batch and 100 parts by weight of meltblown material;
the electret master batch is prepared by the preparation method of any one of claims 1-2 or 3.
5. The meltblown web according to claim 4, wherein the meltblown web comprises 99 parts by weight of polypropylene powder resin and 0.2 to 0.8 parts by weight of organic peroxide;
the melt flow rate of the polypropylene powder resin is not lower than 20g/10min under the conditions of 230 ℃ and 2.16Kg load;
the organic peroxide includes one or more of di-tert-butyl diisopropylbenzene peroxide, di-tert-butyl peroxide and bis (3, 5-trimethylacetyl) peroxide.
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