CN111499970A - Electret modified polypropylene material special for melt-blown non-woven fabric applicable to mask and preparation method thereof - Google Patents
Electret modified polypropylene material special for melt-blown non-woven fabric applicable to mask and preparation method thereof Download PDFInfo
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- CN111499970A CN111499970A CN202010316821.1A CN202010316821A CN111499970A CN 111499970 A CN111499970 A CN 111499970A CN 202010316821 A CN202010316821 A CN 202010316821A CN 111499970 A CN111499970 A CN 111499970A
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- China
- Prior art keywords
- melt
- electret
- organic peroxide
- blown non
- modified polypropylene
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- 239000000463 material Substances 0.000 title claims abstract description 80
- -1 polypropylene Polymers 0.000 title claims abstract description 68
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 63
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 63
- 239000004744 fabric Substances 0.000 title claims abstract description 38
- 239000004750 melt-blown nonwoven Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 150000001451 organic peroxides Chemical class 0.000 claims abstract description 52
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 34
- 239000000843 powder Substances 0.000 claims abstract description 30
- 229920005629 polypropylene homopolymer Polymers 0.000 claims abstract description 22
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 18
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 18
- 239000000314 lubricant Substances 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 238000005469 granulation Methods 0.000 claims description 8
- 230000003179 granulation Effects 0.000 claims description 8
- 239000012257 stirred material Substances 0.000 claims description 7
- XYXJKPCGSGVSBO-UHFFFAOYSA-N 1,3,5-tris[(4-tert-butyl-3-hydroxy-2,6-dimethylphenyl)methyl]-1,3,5-triazinane-2,4,6-trione Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C)=C1CN1C(=O)N(CC=2C(=C(O)C(=CC=2C)C(C)(C)C)C)C(=O)N(CC=2C(=C(O)C(=CC=2C)C(C)(C)C)C)C1=O XYXJKPCGSGVSBO-UHFFFAOYSA-N 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 5
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 4
- 239000008116 calcium stearate Substances 0.000 claims description 4
- 235000013539 calcium stearate Nutrition 0.000 claims description 4
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 claims description 4
- 239000003344 environmental pollutant Substances 0.000 claims description 4
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 231100000719 pollutant Toxicity 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 4
- VSAWBBYYMBQKIK-UHFFFAOYSA-N 4-[[3,5-bis[(3,5-ditert-butyl-4-hydroxyphenyl)methyl]-2,4,6-trimethylphenyl]methyl]-2,6-ditert-butylphenol Chemical compound CC1=C(CC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)C(C)=C(CC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)C(C)=C1CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 VSAWBBYYMBQKIK-UHFFFAOYSA-N 0.000 claims description 3
- 239000005997 Calcium carbide Substances 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical group CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims description 3
- VNQNXQYZMPJLQX-UHFFFAOYSA-N 1,3,5-tris[(3,5-ditert-butyl-4-hydroxyphenyl)methyl]-1,3,5-triazinane-2,4,6-trione Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CN2C(N(CC=3C=C(C(O)=C(C=3)C(C)(C)C)C(C)(C)C)C(=O)N(CC=3C=C(C(O)=C(C=3)C(C)(C)C)C(C)(C)C)C2=O)=O)=C1 VNQNXQYZMPJLQX-UHFFFAOYSA-N 0.000 claims description 2
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 2
- BGHBLQKNCVRIKV-UHFFFAOYSA-N OP(O)OP(O)O.OCC(CO)(CO)CO.C(C)(C)(C)C1=C(C=CC(=C1)C(C)(C)C)O.C(C)(C)(C)C1=C(C=CC(=C1)C(C)(C)C)O Chemical compound OP(O)OP(O)O.OCC(CO)(CO)CO.C(C)(C)(C)C1=C(C=CC(=C1)C(C)(C)C)O.C(C)(C)(C)C1=C(C=CC(=C1)C(C)(C)C)O BGHBLQKNCVRIKV-UHFFFAOYSA-N 0.000 claims description 2
- 239000007983 Tris buffer Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 239000008187 granular material Substances 0.000 claims description 2
- 150000002500 ions Chemical class 0.000 claims description 2
- 235000019359 magnesium stearate Nutrition 0.000 claims description 2
- WGKLOLBTFWFKOD-UHFFFAOYSA-N tris(2-nonylphenyl) phosphite Chemical compound CCCCCCCCCC1=CC=CC=C1OP(OC=1C(=CC=CC=1)CCCCCCCCC)OC1=CC=CC=C1CCCCCCCCC WGKLOLBTFWFKOD-UHFFFAOYSA-N 0.000 claims description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Substances OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 claims 1
- HVLLSGMXQDNUAL-UHFFFAOYSA-N triphenyl phosphite Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)OC1=CC=CC=C1 HVLLSGMXQDNUAL-UHFFFAOYSA-N 0.000 claims 1
- 238000001914 filtration Methods 0.000 abstract description 12
- 238000012545 processing Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000009826 distribution Methods 0.000 abstract description 5
- 230000004048 modification Effects 0.000 abstract description 5
- 238000012986 modification Methods 0.000 abstract description 5
- 230000014759 maintenance of location Effects 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 abstract description 2
- 229920000642 polymer Polymers 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 14
- 239000000203 mixture Substances 0.000 description 7
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 239000004575 stone Substances 0.000 description 4
- 241000282414 Homo sapiens Species 0.000 description 3
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 description 3
- 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 3
- 230000008569 process Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 241000272814 Anser sp. Species 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 2
- 230000000844 anti-bacterial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000010525 oxidative degradation reaction Methods 0.000 description 2
- 150000002978 peroxides Chemical group 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 206010035664 Pneumonia Diseases 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012668 chain scission Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical group 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000012969 di-tertiary-butyl peroxide Substances 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000005686 electrostatic field Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- MGMXGCZJYUCMGY-UHFFFAOYSA-N tris(4-nonylphenyl) phosphite Chemical compound C1=CC(CCCCCCCCC)=CC=C1OP(OC=1C=CC(CCCCCCCCC)=CC=1)OC1=CC=C(CCCCCCCCC)C=C1 MGMXGCZJYUCMGY-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D31/00—Materials specially adapted for outerwear
- A41D31/02—Layered materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
-
- 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
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—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
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
-
- 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
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
- Filtering Materials (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention belongs to the technical field of modification of polymer composite materials, and particularly discloses an electret modified polypropylene material special for melt-blown non-woven fabrics, and a preparation method and application thereof. The electret modified polypropylene material special for melt-blown non-woven fabric mainly comprises the following components in percentage by mass: high melt index homo-polypropylene: 60-90%, 3-20% of organic peroxide master batch, 1-20% of electret powder, 0.1-0.3% of antioxidant and 0.1-0.2% of lubricant; wherein the organic peroxide master batch is composed of the following components in percentage by mass: the high-melt-index homo-polypropylene accounts for 90-95%, and the organic peroxide accounts for 5-10%. The electret modified polypropylene material special for melt-blown non-woven fabrics prepared by the invention has the characteristics of high fluidity, low odor, narrow molecular weight distribution, high filtration efficiency, long charge retention time, stable processing, high cost performance and the like, and can be applied to the production of high-end melt-blown non-woven fabrics.
Description
Technical Field
The invention belongs to the technical field of modification of polymer composite materials, and particularly relates to an electret modified polypropylene material special for melt-blown non-woven fabric for a mask and a preparation method thereof.
Background
Airborne dust is one of the major pollutants, and dust is often contaminated with bacteria, seriously compromising human health. The smaller the dust particles, the longer it will stay in the air and the greater the likelihood of inhalation by the human body. The traditional mask filter material is not very effective in filtering particulate matters smaller than 1 μm, so that human beings suffer great harm when dealing with diseases which can be propagated through air, such as SARS, new coronary pneumonia and the like. Therefore, it is an important issue to develop a filter material with high efficiency and low resistance for purifying air.
The special material for melt-blown polypropylene can be used for preparing an ultra-high melt-index material of superfine polypropylene fibers by a melt-blown forming process, and is a key material which can be applied to preparing M layers of medical masks, medical filter elements and other functional electret filter products. Wherein, the molecular weight distribution, the low molecular compound residue condition and the like of the special material for melt-blown polypropylene directly influence the application performance of the end medical mask and the filter element. At present, the conventional melt-blown polypropylene materials in the market generally have the defects of poor stability in the processing process, large product odor, incapability of recycling products and the like. In addition, the fiber filtering material has poor filtering effect on particles with the particle diameter of less than 1 μm, and the electrostatic adsorption must be increased in the filtering process, charged particles are attracted and captured by coulomb force, so that submicron particles in gas are filtered more effectively, the filtering efficiency is greatly enhanced, and the air resistance cannot be increased.
Based on the reasons, the development of the melt-blown polypropylene material with good processability, low micromolecule residue, antibacterial and bactericidal properties and high filtering efficiency has very important significance.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an electret modified polypropylene material special for melt-blown non-woven fabric for masks. The prepared polypropylene material has the characteristics of high fluidity, low odor, narrow molecular weight distribution, high filtration efficiency, long charge retention time, stable processing, high cost performance and the like
The invention also aims to provide a preparation method of the electret modified polypropylene material special for melt-blown non-woven fabric applicable to masks.
The invention further aims to provide the application of the electret modified polypropylene material special for melt-blown non-woven fabric for masks in the industries of producing air filter elements, water purifier filter elements, masks, pollutant adsorption and the like.
The purpose of the invention is realized by the following scheme:
an electret modified polypropylene material special for melt-blown non-woven fabric of a mask, which mainly comprises the following components in percentage by mass:
high melt index homo-polypropylene: 60 to 90 percent
3 to 20 percent of organic peroxide master batch
Electret powder: 1 to 20 percent
Antioxidant: 0.1 to 0.3 percent
Lubricant: 0.1 to 0.2 percent
Wherein the organic peroxide master batch is composed of the following components in percentage by mass:
high melt index homo-polypropylene: 90 to 95 percent
Organic peroxide: 5 to 10 percent.
The high-melt-index homo-polypropylene is powdery polypropylene, and the mass flow rate of a melt is 50-100 g/10 min;
the organic peroxide master batch is granular, wherein the high-melt-index homo-polypropylene and the organic peroxide are preferably in a mass percentage of 92%: 8 percent. The organic peroxide in the organic peroxide master batch is preferably at least one of di-tert-butyl peroxide and dicumyl peroxide;
the electret powder is calcium carbide gas powder capable of releasing negative ions, is white in color and has a particle size of 0.1-0.5 mu m;
the antioxidant is at least one of tetrakis [ methyl- β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] pentaerythritol ester (antioxidant 1010), 1,3, 5-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) isocyanuric acid (antioxidant 3114), 1,3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene (antioxidant 330), 1,3, 5-tris (4-tert-butyl-3-hydroxy-2, 6-dimethylbenzyl) -1,3, 5-triazine-2, 4,6- (1H,3H,5H) -trione (antioxidant 1790), tris (nonylphenyl) phosphite (antioxidant TNPP), tris (2, 4-di-tert-butyl) phenyl phosphite (antioxidant 168) and bis (2, 4-di-tert-butylphenol) pentaerythritol diphosphite (antioxidant 626);
the lubricant is at least one of zinc stearate, calcium stearate, magnesium stearate, polyethylene wax, polypropylene wax and N, N' -ethylene bis stearamide;
the preparation method of the organic peroxide master batch comprises the following steps: the high-melt-index homopolymerized polypropylene and the organic peroxide in the organic peroxide master batch formula are mixed in proportion and then extruded and granulated.
Preferably, the preparation method of the organic peroxide master batch comprises the following steps:
(a) accurately weighing the high-melt-index homo-polypropylene and the organic peroxide in the organic peroxide master batch formula, and then uniformly mixing;
(b) adding the uniformly mixed materials obtained in the step (1) into a main feeding hopper of a parallel double-screw extruder, and further blending, melting and extruding the materials; the temperatures of all sections of the parallel twin-screw extruder from the hopper to the die head are respectively set as (total 12 zones): 110-170 ℃, 120-180 ℃, 130-180 ℃, 140-190 ℃;
(c) the strips discharged from the die of the extruder are cooled by a water tank and dried by a fan, and then enter a granulator for granulation, so that the organic peroxide master batch can be obtained.
Uniformly mixing in the step (a) by stirring for 1-3 minutes in a high-speed stirrer at the rotating speed of 1000-3000 rpm;
the length to diameter ratio of the parallel twin-screw extruder in step (b) is preferably 48: 1. The screw rotating speed of a main machine of the parallel double-screw extruder is 200-500 r/min, the frequency of a main hopper feeding screw is 10-25 HZ, a main machine barrel body is provided with 1 vacuum port, and the vacuum degree is 500-600 mmHg;
the length of the organic peroxide master batch obtained in the step (b) is preferably 3-5 mm.
A method for preparing the electret modified polypropylene material special for melt-blown non-woven fabrics of masks comprises the steps of mixing the high-melt-index homo-polypropylene, organic peroxide master batches, electret powder, an antioxidant and a lubricant in proportion, and extruding and granulating.
Preferably, the method for preparing the electret modified polypropylene material special for melt-blown non-woven fabric for masks comprises the following steps:
(a) accurately weighing the high-melt-index homo-polypropylene, the organic peroxide master batch, the electret powder, the antioxidant and the lubricant in the electret modified polypropylene material formula special for the melt-blown non-woven fabric according to a certain proportion, and then uniformly mixing;
(b) adding the uniformly stirred materials into a main feeding hopper of a parallel double-screw extruder, and further blending, melting and extruding the materials; the temperature of each section of the extruder from the hopper to the die head is respectively set as (total 12 zones): 160-220 ℃, 170-230 ℃, 180-230 ℃, 190-240 ℃ and 190-240 ℃;
(c) and (3) cooling the strips discharged from the die of the parallel double-screw extruder by a water tank, drying the strips by a fan, and then cutting the strips into granules by a granulator to obtain the electret modified polypropylene material special for melt-blown non-woven fabric.
The step (a) is preferably to stir the mixture in a high-speed stirrer at a speed of 1000 to 3000rpm for 5 to 8 minutes.
The length to diameter ratio of the parallel twin-screw extruder in step (b) is preferably 48: 1; the screw rotating speed of a main machine of the parallel double-screw extruder is 300-500 r/min, the frequency of a main hopper feeding screw is 20-45 HZ, and a main machine barrel body is provided with two vacuum ports with the vacuum degree of 500-600 mmHg;
the length of the electret modified polypropylene material special for melt-blown non-woven fabrics obtained in the step (b) is preferably 3-5 mm.
The electret modification can be applied to the application of polypropylene materials special for melt-blown non-woven fabrics of masks in the industries of air filter elements, water purifier filter elements, masks, pollutant adsorption and the like. More preferably, the mask intermediate layer is applied to the preparation of a mask for filtering dust, bacteria and viruses in air.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the invention adopts the powdery high-melt-index homopolymerized polypropylene as a main matrix, on one hand, compared with the conventional granular polypropylene, the powdery high-melt-index homopolymerized polypropylene can be better and fully mixed with electret powder, an antioxidant and a lubricant, so that the material is more uniform and the performance is more stable; on the other hand, the addition amount of organic peroxide can be reduced, so that the material cost is reduced, the peroxide residue is reduced, the reaction time of extrusion granulation is reduced, and the processing efficiency is improved.
(2) The invention directly adds the electret powder into the melt-blown polypropylene material to carry out one-step production, saves the cost and improves the production efficiency compared with the traditional two-step method of preparing the electret master batch firstly.
(3) Compared with the traditional metering feeding mode, the mode of adopting the organic peroxide master batch can ensure stable material feeding, uniform material performance and smaller fluctuation of production quality; in addition, the organic peroxide master batch is convenient to store, and the potential safety hazard in production is effectively reduced.
(4) The invention adopts the twin-screw extruder with super large length-diameter ratio, high rotating speed and large torque to carry out melt mixing, thus greatly improving the mixing and dispersing effects of the material and improving the stability of the material; meanwhile, the super-large length-diameter ratio can improve the reaction time of the organic peroxide in the screw, thereby reducing the phenomena of large smell and unstable production caused by peroxide residue.
(5) The electret modified polypropylene material special for melt-blown non-woven fabrics prepared by the invention has the characteristics of high fluidity, low odor, narrow molecular weight distribution, high filtration efficiency, long charge retention time, stable processing, high cost performance and the like, and can be applied to the production of high-end melt-blown non-woven fabrics.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto. The high-melting-index homopolymerized polypropylene is powdery polypropylene, and the melt mass flow rate is 50-100 g/10min (the test conditions are 230 ℃ and 2.16 KG);
the reagents used in the examples are commercially available without specific reference.
The invention discloses an electret modified polypropylene material special for melt-blown non-woven fabric, which mainly comprises the following components in percentage by mass: 60-90% of high-melt-index homo-polypropylene, 3-20% of organic peroxide master batch, 1-20% of electret powder, 0.1-0.2% of antioxidant and 0.1-0.2% of lubricant.
Wherein the organic peroxide master batch is composed of the following components in percentage by mass: high-melt-index homo-polypropylene 90-95% and organic peroxide 5-10%.
The high-melt-index homopolymerized polypropylene is used as a basic component of the material, so that the material is endowed with good processing characteristics and excellent physical and mechanical properties; the organic peroxide master batch is mainly used as a degrading agent to cause the chain scission reaction of a polypropylene molecular chain, thereby preparing a polypropylene material with high fluidity and narrow molecular weight distribution; the electret powder has the function of enabling a polypropylene material to carry static charge under a high-voltage electrostatic field and has the capability of keeping the static charge for a long time; the antioxidant has the functions of preventing the high-temperature oxidative degradation of the material during processing and simultaneously improving the oxidative degradation resistance of the material during use; the lubricant has the functions of endowing the material with good lubricating property, improving the dispersion property of the filler in the material, reducing the friction between the material and an equipment cylinder and improving the demoulding property and the appearance glossiness of the material.
The organic peroxide master batches in the following examples 1 to 5 were prepared in the following manner:
the composition comprises the following components in percentage by mass:
high melt index homopolymerized polypropylene 92% (brand: PPH-MN60 powder, China petrochemical North sea refining Co., Ltd.), organic peroxide 8% (di-tert-butyl peroxide DTBP, Jiangsu Qiangsheng functional chemical Co., Ltd.).
Accurately weighing the high-melt-index homo-polypropylene and the organic peroxide according to a certain proportion, and then adding the mixture into a high-speed stirrer (the rotating speed is 1500rpm) to stir for 2 minutes.
Adding the uniformly stirred materials into a main feeding hopper of a parallel double-screw extruder with the length-diameter ratio of 48:1, and setting the temperature of each section from the hopper to a die head of the extruder as (total 12 regions): 110 ℃, 110 ℃, 120 ℃, 120 ℃, 130 ℃, 140 ℃, 150 ℃, 150 ℃, 130 ℃, 130 ℃, 140 ℃, 140 ℃, the screw rotating speed of the main machine is 300r/min, the frequency of the feeding screw of the main hopper is 15HZ, the cylinder of the main machine is provided with 1 vacuum port with the vacuum degree of 500mmHg, and then the materials are blended, melted and extruded.
The strips coming out of the extruder die are cooled by a water tank and dried by a fan, and then enter a granulator for granulation, so that organic peroxide master batches with the length of 3-5 mm can be obtained.
Example 1
The composition comprises the following components in percentage by mass:
high-melt-index homo-polypropylene 60% (brand: PPH-MN60 powder, China petrochemical North sea refining Limited liability company), organic peroxide master batch 20%, electret powder 19.5% (Tianjin hong Yan Tianshan stone industry nanotechnology Limited company, particle size 0.5 μm), antioxidant 1010: 0.1% (model: SONOX 1010, Shandong province Linyi City Sanfeng chemical industry Limited company), antioxidant 168: 0.2% (model: SONOX 168, Sanfeng chemical Co., Linyi city, Shandong province), 0.2% (calcium stearate 3818, Zhongshan Huaming Tai chemical Co., Ltd.).
The materials are added into a high-speed stirrer (the rotating speed is 1500rpm) after being weighed and stirred for 5 minutes. Adding the uniformly stirred materials into a main feeding hopper of a parallel double-screw extruder with the length-diameter ratio of 48:1, and setting the temperature of each section from the hopper to a die head of the extruder as (total 12 regions): 220 ℃, 220 ℃, 220 ℃, 220 ℃, 230 ℃, 230 ℃, 230 ℃, 230 ℃, 230 ℃, 230 ℃, 230 ℃, 240 ℃, 240 ℃, the screw rotating speed of the main machine is 500r/min, the frequency of the feeding screw of the main hopper is 32HZ, the cylinder body of the main machine is provided with two vacuum ports, the vacuum degree is 600mmHg, and then the materials are blended, melted and extruded.
The strips coming out of the extruder die are cooled by a water tank and dried by a fan, and then enter a granulator for granulation, so that the electret modified polypropylene material special for melt-blown non-woven fabric with the length of 3-5 mm can be obtained.
Example 2
The composition comprises the following components in percentage by mass:
high-melt-index homo-polypropylene 64.5% (brand: PPH-MN60 powder, China petrochemical North sea refining Limited liability company), organic peroxide master batch 15%, electret powder 20% (Tianjin hong goose Tianshan stone industry nanotechnology Limited company, particle size 0.5 μm), antioxidant 1010: 0.1% (model: SONOX 1010, Shandong province Linyi City Sanfeng chemical industry Limited company), antioxidant 168: 0.2% (model: SONOX 168, Sanfeng chemical Co., Linyi city, Shandong province), 0.2% (calcium stearate 3818, Zhongshan Huaming Tai chemical Co., Ltd.).
The materials are added into a high-speed stirrer (the rotating speed is 1500rpm) after being weighed and stirred for 5 minutes. Adding the uniformly stirred materials into a main feeding hopper of a parallel double-screw extruder with the length-diameter ratio of 48:1, and setting the temperature of each section from the hopper to a die head of the extruder as (total 12 regions): 220 ℃, 220 ℃, 220 ℃, 220 ℃, 230 ℃, 230 ℃, 230 ℃, 230 ℃, 230 ℃, 230 ℃, 230 ℃, 240 ℃, 240 ℃, the screw rotating speed of the main machine is 500r/min, the frequency of the feeding screw of the main hopper is 32HZ, the cylinder body of the main machine is provided with two vacuum ports, the vacuum degree is 600mmHg, and then the materials are blended, melted and extruded.
The strips coming out of the extruder die are cooled by a water tank and dried by a fan, and then enter a granulator for granulation, so that the electret modified polypropylene material special for melt-blown non-woven fabric with the length of 3-5 mm can be obtained.
Example 3
The composition comprises the following components in percentage by mass:
high-melt-index homo-polypropylene 86.6% (brand: PP650 powder, Michelson Shinhua Limited liability Co.), organic peroxide master batch 3%, electret powder 10% (Tianjin hongyan Tianshan Stone industry nanotechnology Limited Co., Ltd., particle size 0.5 μm), antioxidant 1790: 0.1% (model: 1790, American cyanogen specialization chemical Co., Ltd.), antioxidant 626: 0.1% (model: SONOX 626, Sanfeng chemical Co., Linyi city, Shandong province), 0.2% (Zinc stearate BS-2818, Zhongshan Huaming Tai chemical Co., Ltd.).
The materials are added into a high-speed stirrer (the rotating speed is 1600rpm) to be stirred for 7 minutes after being weighed. Adding the uniformly stirred materials into a main feeding hopper of a parallel double-screw extruder with the length-diameter ratio of 48:1, and setting the temperature of each section from the hopper to a die head of the extruder as (total 12 regions): 220 ℃, 220 ℃, 220 ℃, 220 ℃, 230 ℃, 230 ℃, 230 ℃, 230 ℃, 230 ℃, 230 ℃, 230 ℃, 240 ℃, 240 ℃, the screw rotating speed of the main machine is 500r/min, the frequency of the feeding screw of the main hopper is 32HZ, the cylinder body of the main machine is provided with two vacuum ports, the vacuum degree is 600mmHg, and then the materials are blended, melted and extruded.
The strips coming out of the extruder die are cooled by a water tank and dried by a fan, and then enter a granulator for granulation, so that the electret modified polypropylene material special for melt-blown non-woven fabric with the length of 3-5 mm can be obtained.
Example 4
The composition comprises the following components in percentage by mass:
high-melt-index homo-polypropylene 90% (brand: PP650 powder, Michelson Shinhua Limited liability company), organic peroxide master batch 8.6%, electret powder 1% (Tianjin hongyan Tianshan Stone industry nanotechnology Limited company, particle size 0.5 μm), antioxidant 1790: 0.1% (model: 1790, American cyanogen specialization chemical Limited company), antioxidant 626: 0.1% (model: SONOX 626, Sanfeng chemical Co., Linyi city, Shandong province), 0.2% (Zinc stearate BS-2818, Zhongshan Huaming Tai chemical Co., Ltd.).
The above materials were weighed and then stirred in a high speed stirrer (rotating speed 3000rpm) for 5 minutes. Adding the uniformly stirred materials into a main feeding hopper of a parallel double-screw extruder with the length-diameter ratio of 48:1, and setting the temperature of each section from the hopper to a die head of the extruder as (total 12 regions): 220 ℃, 220 ℃, 220 ℃, 220 ℃, 230 ℃, 230 ℃, 230 ℃, 230 ℃, 230 ℃, 230 ℃, 230 ℃, 240 ℃, 240 ℃, the screw rotating speed of a main machine is 400r/min, the frequency of a main hopper feeding screw is 35HZ, two vacuum ports are arranged on a main machine cylinder body, the vacuum degree is 500mmHg, and then the materials are blended, melted and extruded.
The strips coming out of the extruder die are cooled by a water tank and dried by a fan, and then enter a granulator for granulation, so that the electret modified polypropylene material special for melt-blown non-woven fabric with the length of 3-5 mm can be obtained.
Comparative example 1
The preparation method is the same as example 3, except that 86.6% of high-melt index homopolymerized polypropylene powder is changed into low-melt index homopolymerized polypropylene particles with the same mass part (the brand: PPZ30S, China petrochemical group May petrochemical company).
Comparative example 2
The preparation method is the same as the example 4, except that the components are mixed according to the following mass percentage:
high-melt-index homo-polypropylene 97.91% (brand: PP650 powder, Michelson-Michelson), organic peroxide 0.69%, electret powder 1% (Tianjin hong goose Tianshan stone industry nanotechnology Co., Ltd., particle size 0.5 μm), antioxidant 1790: 0.1% (model: 1790, American cyanogen specialization chemical Co., Ltd.), antioxidant 626: 0.1% (model: SONOX 626, Sanfeng chemical Co., Linyi city, Shandong province), 0.2% (Zinc stearate BS-2818, Zhongshan Huaming Tai chemical Co., Ltd.).
Comparative example 3
The preparation method is the same as example 3, except that 10% of electret powder (Tianjin hongyan Tianshan stone industry nanotechnology Co., Ltd., particle size 0.5 μm) is changed into 10% of electret powder (calcium carbide gas powder, particle size 1.5 μm, Shijiazun county longitude and latitude mineral product processing factory).
The electret-modified polypropylene material specially used for melt-blown non-woven fabrics obtained in the above examples 1 to 4 and comparative examples 1 to 3 was tested, wherein the filtration efficiency was measured by using a mask particulate filtration efficiency tester, and the test results are shown in the following table:
the above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. An electret modified polypropylene material special for melt-blown non-woven fabric of a mask is characterized by mainly comprising the following components in percentage by mass:
high melt index homo-polypropylene: 60 to 90 percent
3 to 20 percent of organic peroxide master batch
Electret powder: 1 to 20 percent
Antioxidant: 0.1 to 0.3 percent
Lubricant: 0.1 to 0.2 percent
Wherein the organic peroxide master batch is composed of the following components in percentage by mass:
high melt index homo-polypropylene: 90 to 95 percent
Organic peroxide: 5 to 10 percent.
2. The electret modified polypropylene material special for melt-blown non-woven fabric of a mask according to claim 1, wherein the electret modified polypropylene material comprises: the high-melt-index homo-polypropylene is powdery polypropylene; the organic peroxide in the organic peroxide master batch is at least one of di-tert-butyl peroxide and dicumyl peroxide.
3. The electret modified polypropylene material special for melt-blown non-woven fabric of a mask according to claim 1, wherein the preparation method of the organic peroxide master batch comprises the following steps: the high-melt-index homopolymerized polypropylene and the organic peroxide in the organic peroxide master batch formula are mixed in proportion and then extruded and granulated.
4. The electret modified polypropylene material special for melt-blown non-woven fabric of a mask according to claim 1, 2 or 3, wherein the preparation method of the organic peroxide master batch comprises the following steps:
(a) accurately weighing the high-melt-index homo-polypropylene and the organic peroxide in the organic peroxide master batch formula, and then uniformly mixing;
(b) adding the uniformly mixed materials obtained in the step (1) into a main feeding hopper of a parallel double-screw extruder, and further blending, melting and extruding the materials; the temperature of each section from a hopper to a die head of the parallel double-screw extruder is respectively set as follows: 110-170 ℃, 120-180 ℃, 130-180 ℃, 140-190 ℃;
(c) the strips discharged from the die of the extruder are cooled by a water tank and dried by a fan, and then enter a granulator for granulation, so that the organic peroxide master batch can be obtained.
5. The electret modified polypropylene material special for melt-blown non-woven fabric of a mask according to claim 4, wherein the electret modified polypropylene material comprises: uniformly mixing in the step (a) by stirring for 1-3 minutes in a high-speed stirrer at the rotating speed of 1000-3000 rpm; the length-diameter ratio of the parallel double-screw extruder in the step (b) is 48: 1; the screw rotating speed of a main machine of the parallel double-screw extruder is 200-500 r/min, the frequency of a main hopper feeding screw is 10-25 HZ, a main machine barrel body is provided with 1 vacuum port, and the vacuum degree is 500-600 mmHg; the length of the organic peroxide master batch obtained in the step (b) is 3-5 mm.
6. The electret modified polypropylene material special for melt-blown non-woven fabrics of masks according to claim 1, wherein the electret powder is calcium carbide gas powder capable of releasing negative ions, the antioxidant is tetrakis [ methyl- β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] pentaerythritol ester, 1,3, 5-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) isocyanuric acid, 1,3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene, 1,3, 5-tris (4-tert-butyl-3-hydroxy-2, 6-dimethylbenzyl) -1,3, 5-triazine-2, 4,6- (1H,3H,5H) -trione, tris (nonylphenyl) phosphite, tris (2, 4-di-tert-butyl) phenylphosphite and bis (2, 4-di-tert-butylphenol) pentaerythritol diphosphite, and the lubricant is at least one of zinc stearate, calcium stearate, magnesium stearate, N '-ethylene glycol N, N' -polyethylene wax and polyethylene wax.
7. The method for preparing the electret modified polypropylene material special for melt-blown non-woven fabric applicable to masks according to any one of claims 1 to 6 is characterized by comprising the following steps: the preparation method specifically comprises the steps of mixing the high-melt-index homopolymerized polypropylene, the organic peroxide master batch, the electret powder, the antioxidant and the lubricant in proportion, and then extruding and granulating.
8. The method for preparing the electret modified polypropylene material special for the melt-blown non-woven fabric of the mask according to claim 7, wherein the method comprises the following steps:
(a) accurately weighing the high-melt-index homo-polypropylene, the organic peroxide master batch, the electret powder, the antioxidant and the lubricant in the electret modified polypropylene material formula special for the melt-blown non-woven fabric according to a certain proportion, and then uniformly mixing;
(b) adding the uniformly stirred materials into a main feeding hopper of a parallel double-screw extruder, and further blending, melting and extruding the materials; the temperature of each section from the hopper to the die head of the extruder is respectively set as follows: 160-220 ℃, 170-230 ℃, 180-230 ℃, 190-240 ℃ and 190-240 ℃;
(c) and (3) cooling the strips discharged from the die of the parallel double-screw extruder by a water tank, drying the strips by a fan, and then cutting the strips into granules by a granulator to obtain the electret modified polypropylene material special for melt-blown non-woven fabric.
9. The method for preparing the electret modified polypropylene material special for melt-blown non-woven fabric applicable to masks according to claim 8, wherein the method comprises the following steps:
uniformly mixing in the step (a) is to stir for 5-8 minutes in a high-speed stirrer at the rotating speed of 1000-3000 rpm;
the length-diameter ratio of the parallel double-screw extruder in the step (b) is 48: 1; the screw rotating speed of a main machine of the parallel double-screw extruder is 300-500 r/min, the frequency of a main hopper feeding screw is 20-45 HZ, and a main machine barrel body is provided with two vacuum ports with the vacuum degree of 500-600 mmHg;
the length of the electret modified polypropylene material special for melt-blown non-woven fabric obtained in the step (b) is 3-5 mm.
10. The electret modified polypropylene material special for melt-blown non-woven fabric of a mask according to any one of claims 1 to 6 is applied to air filter elements, water purifier filter elements, masks and pollutant adsorption industries.
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Application publication date: 20200807 |