CN111909455A - High-oiliness particle filtering efficiency melt-blown material and preparation method and application thereof - Google Patents
High-oiliness particle filtering efficiency melt-blown material and preparation method and application thereof Download PDFInfo
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- CN111909455A CN111909455A CN202010841333.2A CN202010841333A CN111909455A CN 111909455 A CN111909455 A CN 111909455A CN 202010841333 A CN202010841333 A CN 202010841333A CN 111909455 A CN111909455 A CN 111909455A
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- 238000001914 filtration Methods 0.000 title claims abstract description 94
- 239000002245 particle Substances 0.000 title claims abstract description 86
- 239000000463 material Substances 0.000 title claims abstract description 74
- 238000002360 preparation method Methods 0.000 title claims abstract description 27
- -1 polypropylene Polymers 0.000 claims abstract description 66
- 239000004743 Polypropylene Substances 0.000 claims abstract description 56
- 229920001155 polypropylene Polymers 0.000 claims abstract description 56
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 37
- 239000000843 powder Substances 0.000 claims abstract description 32
- 239000011032 tourmaline Substances 0.000 claims abstract description 32
- 229940070527 tourmaline Drugs 0.000 claims abstract description 32
- 229910052613 tourmaline Inorganic materials 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 31
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 25
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 150000001875 compounds Chemical class 0.000 claims description 55
- 229920000642 polymer Polymers 0.000 claims description 28
- 238000002156 mixing Methods 0.000 claims description 25
- 229910052731 fluorine Inorganic materials 0.000 claims description 23
- 239000011737 fluorine Substances 0.000 claims description 23
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 22
- 239000004744 fabric Substances 0.000 claims description 17
- 239000002904 solvent Substances 0.000 claims description 17
- 238000000227 grinding Methods 0.000 claims description 16
- 238000000643 oven drying Methods 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 8
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 6
- ZHPNWZCWUUJAJC-UHFFFAOYSA-N fluorosilicon Chemical compound [Si]F ZHPNWZCWUUJAJC-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 229920005629 polypropylene homopolymer Polymers 0.000 claims description 4
- 239000004094 surface-active agent Substances 0.000 claims description 4
- 125000001153 fluoro group Chemical group F* 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 239000004812 Fluorinated ethylene propylene Substances 0.000 claims description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- 239000002033 PVDF binder Substances 0.000 claims description 2
- 229920006026 co-polymeric resin Polymers 0.000 claims description 2
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical group FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 2
- 229910052744 lithium Inorganic materials 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- 229920009441 perflouroethylene propylene Polymers 0.000 claims description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 2
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000009472 formulation Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 11
- 239000002131 composite material Substances 0.000 abstract description 7
- 229920002313 fluoropolymer Polymers 0.000 abstract description 3
- 239000004811 fluoropolymer Substances 0.000 abstract description 3
- 238000001125 extrusion Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 8
- 230000014759 maintenance of location Effects 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 150000001412 amines Chemical class 0.000 description 2
- 239000004750 melt-blown nonwoven Substances 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- 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 1
- 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 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000002144 chemical decomposition reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 125000003709 fluoroalkyl group Chemical group 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
- A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
- A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
- A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
- B01D39/083—Filter cloth, i.e. woven, knitted or interlaced material of organic material
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Electrostatic Separation (AREA)
- Filtering Materials (AREA)
Abstract
The invention discloses a high-oiliness particle filtration efficiency melt-blown material, a preparation method and application thereof, wherein the material comprises the following raw materials in parts by weight: the composite electret agent comprises ultrahigh-flow polypropylene, an antioxidant and a composite electret agent, wherein the composite electret agent is prepared from the following raw materials in parts by weight: tourmaline powder, fluoropolymer and oleophobic agent. The invention aims at the defects that the die head is easy to block in the extrusion process of the existing melt-blown material, the filtering efficiency of oily particles is low, the maintaining time of the filtering efficiency is short, and the like, and solves the problems of uneven filtering efficiency and large effect difference of the material in different equipment and die heads.
Description
Technical Field
The invention relates to the technical field of medical health, in particular to a high-oiliness particle filtration efficiency melt-blown material, a preparation method and application thereof.
Background
The prior art for producing melt-blown cloth mainly adopts a polypropylene chemical degradation method to obtain melt-blown polypropylene (PP), and then adds electret master batches through physical mixing, so that the compatibility of the electret master batches and the melt-blown PP is poor, the dispersion is not uniform enough, a die head is easy to block in the spinning process, crystal points are easy to generate on the surface of the melt-blown cloth, the toughness of the melt-blown cloth is reduced, and partial static effect is easy to lose, so that the produced melt-blown cloth has the problems of low filtration efficiency and the like, and the same material is made in different equipment and die dies, so that the problems of non-uniform filtration efficiency and large difference in filtration effect occur, the filtration effect on oily particles is poor, and the retention time of the filtration efficiency.
CN106048887A discloses a melt-blown non-woven fabric for efficiently filtering PM2.5 and a manufacturing method thereof, wherein the melt-blown non-woven fabric for efficiently filtering PM2.5 is prepared by the following components in percentage by weight: 95-97% of polypropylene and 3-5% of modified tourmaline; the manufacturing method comprises the following steps: (1) firstly, dispersing, uniformly mixing and melting the improved tourmaline particles and polypropylene slices in the proportion by mass percent of 20% to prepare master batches; the granulation adopts an auxiliary agent accounting for 26.1-37.1 mass percent of the improved tourmaline particles; (2) and uniformly mixing and melting the obtained master batch and the polypropylene slices in a mass percentage of 15-25%, extruding, and stretching under high-speed hot air flow to obtain the product. However, the screw extruder used in the melt-blown production line is generally a single screw extruder, so that the mixing and dispersing effects are not ideal enough, the tourmaline is not uniformly distributed in the material, and the problem of non-uniform and stable filtering effect still occurs.
CN 111423663A discloses a long-acting melt-blown polypropylene composite electret material for mask melt-blown cloth and a preparation method thereof, wherein the long-acting melt-blown polypropylene composite electret material comprises the following components in parts by weight: 100 parts of polypropylene resin; 0.1-10 parts of a fluorine-silicon polymer; 0.01-2 parts of an inorganic charge enhancer; 0.1-2 parts of a lubricant; 0.01-0.3 part of antioxidant; the fluorine-silicon polymer is fluorine-containing polysiloxane which takes a siloxane bond as a main chain and a fluoroalkyl group as a side chain. In the long-acting melt-blown polypropylene composite electret material for mask melt-blown cloth, the silicone main chain of the fluorine-silicon polymer is flexible, so that the charge injection depth is favorably improved, the fluorine-alkyl side chain promotes charge capture, dipole directional arrangement is generated, the main chain can be covered, the cloth cover is endowed with good hydrophobicity, the material has a good electret effect, and the long-acting property of the material is effectively improved. And the melting point of the fluorine-silicon polymer is low, the fluorine-silicon polymer is uniformly dispersed, and the melt-blown polypropylene composite electret material is simpler to process and form. But the filtering effect on oily particles is not ideal.
Disclosure of Invention
The invention aims to solve the technical problems that the die head is easy to block in the extrusion process of the existing melt-blown material, the melt-blown cloth has poor toughness, the filtering efficiency is low, the filtering effect distribution is uneven, the filtering effect on oily particles is poor, the filtering efficiency retention time is short and the like, and solves the problems that the material has uneven filtering efficiency and large effect difference in different equipment and die heads, and provides a melt-blown material with high oily particle filtering efficiency, and a preparation method and application thereof.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a high-oiliness particle filtration efficiency melt-blown material comprises the following raw materials in parts by weight:
98.5-99.4% of ultrahigh-flow polypropylene
0.1 to 0.5 percent of antioxidant
0.5 to 1 percent of compound electret agent
Wherein the compound electret consists of the following raw materials in parts by weight
20 to 30 percent of tourmaline powder
Fluorine-containing polymer 50-60%
15-30% of oleophobic agent.
The compound electret in the invention has excessive content, which can cause hole blocking, and the probability of hole blocking is gradually increased from more than 1%; and too little content can result in poor and lasting electret effect, which gradually decreases from less than 0.5%. The invention can also increase hindered amine material, the hindered amine has dipole torch polarity, and can neutralize the influence of charge change brought by the outside, thereby ensuring the stable retention of the charge in the material.
The antioxidant in the present invention may be any one or a combination of two or more of antioxidant 1076, antioxidant 1010, antioxidant 168, antioxidant 626 and antioxidant 3114.
In the above technical solution, the ultrahigh flow polypropylene is homopolypropylene, and the melt index thereof is 1400-1800. In the invention, the reason for selecting the homo-polypropylene is that the homo-polypropylene has high crystallinity and can store more space charges after being made into a melt-blown fabric electret.
In the technical scheme, the tourmaline powder comprises 3000-mesh magnesium tourmaline powder and lithium tourmaline powder.
In the above technical scheme, the fluorine-containing polymer comprises any one of polytetrafluoroethylene, polyvinylidene fluoride, fluorinated ethylene propylene, ethylene and tetrafluoroethylene copolymer resin. In the invention, polytetrafluoroethylene is taken as an example, polar fluorine atoms of the polytetrafluoroethylene form more powerful potential traps and have stronger electron capturing capacity, and molecular chains of the polytetrafluoroethylene are nonpolar, so that the stability of charges of the polytetrafluoroethylene is ensured, and the polytetrafluoroethylene has better energy storage capacity. After the polytetrafluoroethylene is added, the initial electrostatic voltage of the material is greatly increased, the attenuation of the electrostatic voltage is obviously weakened, and along with the increase of the content of the polytetrafluoroethylene, the initial electrostatic voltage of the material is increased, and the attenuation amplitude of the voltage is reduced.
In the above technical scheme, the oleophobic agent in the compound electret agent is any one or combination of more than two of fluorocarbon surfactant, fluorosilicone surfactant and the like.
In the above technical scheme, the preparation process of the compound electret agent comprises: ultrasonic crushing tourmaline powder and fluorine-containing polymer in solvent, adding oleophobic agent, mixing to obtain compound electret, filtering, oven drying, and grinding to obtain powder with particle diameter of 0.2-1.5 μm; after ultrasonic crushing, the particle size of the crushed particles is 0.5-1.0 um; in the mixing process, the stirring frequency during mixing is 40 HZ; in the drying process, the drying temperature is 100 ℃, and the water content after drying is 0.03%. In the ultrasonic process, the frequency of the ultrasonic is 15 KHz-25 KHz, the time of the ultrasonic is 2-3 min, stirring is accompanied in the ultrasonic process, and the stirring frequency is 45-55 Hz.
The particle size of the powdery particles in the present invention is related to the frequency and duration of the ultrasonic wave, and the principle is that the higher the ultrasonic frequency is, the longer the duration is, the higher the energy applied to the powder is, the smaller the particle size of the powder is, and the smaller the particle size distribution is.
In the technical scheme, in the ultrasonic process, the ultrasonic frequency is 15 KHz-25 KHz, the ultrasonic time is 2-3 min, stirring is accompanied in the ultrasonic process, and the stirring frequency is 45-55 Hz.
The invention further provides a preparation method of the high-oiliness particle filtration efficiency melt-blown material, which comprises the following preparation processes according to the formula of the high-oiliness particle filtration efficiency melt-blown material: putting the ultrahigh-flow polypropylene and the antioxidant into a mixer for premixing for 150 s; and (3) putting the mixed polypropylene into a double-screw extruder, adding the compound electret agent mainly through a side feeding port, and extruding at 220-250 ℃ to obtain the high-oiliness particle filtering efficiency melt-blown material.
In order to improve the stability of the polypropylene in the subsequent preparation process, the polypropylene is premixed with an antioxidant to improve the oxidation resistance and the stability of the polypropylene.
The purpose (principle) of adding the compound electret mainly through a side feeding port is that after ultrahigh-flow polymer is subjected to feeding plasticization, the melt strength is reduced, and the compound electret can be better dispersed when being added.
In the technical scheme, the length-diameter ratio of a screw of the double-screw extruder is 40-48; temperature of each temperature control zone: the temperature of the temperature control 1-2 zone is 200-220 ℃, the temperature of the temperature control 3-4 zone is 230-.
The invention further provides an application of the high-oiliness particle filtering efficiency melt-blown material, which is used for preparing a mask as a melt-blown layer.
The invention has the beneficial effects that:
1. by adopting the ultrahigh-flow homopolymerized polypropylene with proper melt index, the melt-blown material has high actual fluidity and stable fluidity.
2. By adopting the compound electret agent containing proper tourmaline and fluoropolymer, more space charges can be filled in the melt-blown cloth electret, the filtration efficiency is high, the retention time is long, and a die head is not easy to block in the spinning process (the die head is cleaned for 4-6 h).
3. By adopting the compound electret treated by the oleophobic agent, the melt-blown fabric micro-fine fiber is not easily wrapped by oily substances when passing through oily particles, the charge retention time is long, and the filtration efficiency is high.
4. The tourmaline powder and the fluorine-containing polymer are uniformly dispersed in the material by a mode of plasticizing, mixing and uniformly extruding and granulating the compound electret agent and the ultrahigh-flow polypropylene in a double screw, and the melt-blown material produced by the process is suitable for a large and small melt-blown cloth production line, and the filtration efficiency of the melt-blown cloth is uniform.
Detailed Description
For the purpose of facilitating an understanding of the present invention, the present invention will now be described by way of examples. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
A preparation method of a high-oiliness particle filtration efficiency melt-blown material comprises the following steps in sequence:
the method comprises the following steps: ultrasonic crushing tourmaline powder and fluoropolymer in solvent, adding oleophobic agent, mixing to obtain compound electret, filtering, oven drying, and grinding to obtain powdered particles.
Step two: putting the ultrahigh-flow polypropylene and the antioxidant into a mixer for premixing for 150 s; and (3) putting the mixed polypropylene into a double-screw extruder, wherein the compound electret is mainly added through a side feeding port, and extruding to obtain the high-oiliness particle filtering efficiency melt-blown material.
The production process of the melt-blown fabric comprises the following steps: the melt-blowing equipment comprises a screw rod with the diameter of 60mm, 6 temperature control heating zones, a single die head, 156 spinneret orifices and 0.2mm spinneret orifice diameter;
melt-blown process parameters: the temperature in zone 1 is 243 ℃, the temperature in zone 2 is 280 ℃, the temperature in zone 3 is 310 ℃,
the temperature of the 4 area is 305 ℃, the temperature of the 5 area is 302 ℃, and the temperature of the 6 area is 308 ℃; the main frequency of the screw is 9.5Hz, the receiving distance is 300mm, the pressure of hot air is 0.4MPa, the temperature of the hot air is 300 ℃, the rotating speed of the roller is 19.4r/min,
setting electret treatment parameters: the voltage of the electret is 12KV, the electret time is 30s, and the electret distance is 2 cm.
The above production method is explained below by way of examples and comparative examples.
The preparation method of the high oily particle filtration efficiency meltblown material of example 1 sequentially comprises the following steps: the method comprises the following steps: ultrasonic crushing 20% tourmaline powder and 50% fluorine-containing polymer in solvent, adding 30% oleophobic agent, mixing to obtain compound electret, filtering, oven drying, and grinding to obtain powdered particles. Step two: putting 98.5% of ultrahigh-flow polypropylene and 0.5% of antioxidant into a mixer for premixing for 150 s; and (3) putting the mixed polypropylene into a double-screw extruder, wherein 1% of compound electret is mainly added through a side feeding port, and extruding to obtain the high-oiliness particle filtering efficiency melt-blown material.
The preparation method of the high oily particle filtration efficiency meltblown material of example 2 sequentially comprises the following steps: the method comprises the following steps: ultrasonic crushing 20% tourmaline powder and 60% fluorine-containing polymer in solvent, adding 20% oleophobic agent, mixing to obtain compound electret, filtering, oven drying, and grinding to obtain powdered particles. Step two: putting 99.4% of ultrahigh-flow polypropylene and 0.1% of antioxidant into a mixer for premixing for 150 s; and (3) putting the mixed polypropylene into a double-screw extruder, wherein 0.5% of compound electret is mainly added through a side feeding port, and extruding to obtain the high-oiliness particle filtering efficiency melt-blown material.
The preparation method of the high oily particle filtration efficiency meltblown material of example 3 sequentially comprises the following steps: the method comprises the following steps: ultrasonic crushing 25% tourmaline powder and 50% fluorine-containing polymer in solvent, adding 25% oleophobic agent, mixing to obtain compound electret, filtering, oven drying, and grinding to obtain powdered particles. Step two: putting 99.0% of ultrahigh-flow polypropylene and 0.2% of antioxidant into a mixer for premixing for 150 s; and (3) putting the mixed polypropylene into a double-screw extruder, wherein 0.8% of compound electret is mainly added through a side feeding port, and extruding to obtain the high-oiliness particle filtering efficiency melt-blown material.
The preparation method of the high oily particle filtration efficiency meltblown material of example 4 sequentially comprises the following steps: the method comprises the following steps: ultrasonic crushing 28% tourmaline powder and 52% fluorine-containing polymer in solvent, adding 20% oleophobic agent, mixing to obtain compound electret, filtering, oven drying, and grinding to obtain powdered particles. Step two: putting 99.1% of ultrahigh-flow polypropylene and 0.2% of antioxidant into a mixer for premixing for 150 s; and (3) putting the mixed polypropylene into a double-screw extruder, wherein 0.7% of compound electret is mainly added through a side feeding port, and extruding to obtain the high-oiliness particle filtering efficiency melt-blown material.
The preparation method of the high oily particle filtration efficiency meltblown material of example 5 sequentially comprises the following steps: the method comprises the following steps: ultrasonic crushing 22% tourmaline powder and 58% fluorine-containing polymer in solvent, adding 22% oleophobic agent, mixing to obtain compound electret, filtering, oven drying, and grinding to obtain powdered particles. Step two: putting 98.9% of ultrahigh-flow polypropylene and 0.5% of antioxidant into a mixer for premixing for 150 s; and (3) putting the mixed polypropylene into a double-screw extruder, wherein 0.6% of compound electret is mainly added through a side feeding port, and extruding to obtain the high-oiliness particle filtering efficiency melt-blown material.
The preparation method of the high oily particle filtration efficiency meltblown material of example 6, comprising the following steps in order: the method comprises the following steps: ultrasonic crushing 29% tourmaline powder and 53% fluorine-containing polymer in solvent, adding 23% oleophobic agent, mixing to obtain compound electret, filtering, oven drying, and grinding to obtain powdered particles. Step two: putting 98.7% of ultrahigh-flow polypropylene and 0.4% of antioxidant into a mixer for premixing for 150 s; and (3) putting the mixed polypropylene into a double-screw extruder, wherein 0.9% of compound electret is mainly added through a side feeding port, and extruding to obtain the high-oiliness particle filtering efficiency melt-blown material.
The preparation method of the high oily particle filtration efficiency meltblown material of example 7, comprising the following steps in order: the method comprises the following steps: ultrasonic crushing 21% tourmaline powder and 57% fluorine-containing polymer in solvent, adding 22% oleophobic agent, mixing to obtain compound electret, filtering, oven drying, and grinding to obtain powdered particles. Step two: putting 99.2% of ultrahigh-flow polypropylene and 0.3% of antioxidant into a mixer for premixing for 150 s; and (3) putting the mixed polypropylene into a double-screw extruder, wherein 0.5% of compound electret is mainly added through a side feeding port, and extruding to obtain the high-oiliness particle filtering efficiency melt-blown material.
The preparation method of the high oily particle filtration efficiency meltblown material of comparative example 1, comprising the following steps in sequence: the method comprises the following steps: ultrasonic crushing 30% tourmaline powder and 51% fluorine-containing polymer in solvent, adding 19% oleophobic agent, mixing to obtain compound electret, filtering, oven drying, and grinding to obtain powdered particles. Step two: putting 99.4% of ultrahigh-flow polypropylene and 0.2% of antioxidant into a mixer for premixing for 150 s; and (3) putting the mixed polypropylene into a double-screw extruder, wherein 0.4% of compound electret is mainly added through a side feeding port, and extruding to obtain the high-oiliness particle filtering efficiency melt-blown material.
The preparation method of the high oily particle filtration efficiency meltblown material of comparative example 2, comprising the following steps in sequence: the method comprises the following steps: ultrasonic crushing 30% tourmaline powder and 50% fluorine-containing polymer in solvent, adding 20% oleophobic agent, mixing to obtain compound electret, filtering, oven drying, and grinding to obtain powdered particles. Step two: putting 98.4% of ultrahigh-flow polypropylene and 0.5% of antioxidant into a mixer for premixing for 150 s; and (3) putting the mixed polypropylene into a double-screw extruder, wherein 1.1% of compound electret is mainly added through a side feeding port, and extruding to obtain the high-oiliness particle filtering efficiency melt-blown material.
The preparation method of the high oily particle filtration efficiency meltblown material of comparative example 3, comprising the following steps in sequence: the method comprises the following steps: ultrasonic crushing 20% tourmaline powder and 61% fluorine-containing polymer in solvent, adding 19% oleophobic agent, mixing to obtain compound electret, filtering, oven drying, and grinding to obtain powdered particles. Step two: putting 98.9% of ultrahigh-flow polypropylene and 0.1% of antioxidant into a mixer for premixing for 150 s; and (3) putting the mixed polypropylene into a double-screw extruder, wherein 1.0% of compound electret is mainly added through a side feeding port, and extruding to obtain the high-oiliness particle filtering efficiency melt-blown material.
The preparation method of the high oily particle filtration efficiency meltblown material of comparative example 4, comprising the following steps in sequence: the method comprises the following steps: 20% tourmaline powder and 49% fluorine-containing polymer are smashed in a solvent by ultrasonic, 31% oleophobic agent is added and mixed evenly, and the compound electret agent is obtained and is filtered, dried and ground into powder particles. Step two: putting 98.4% of ultrahigh-flow polypropylene and 0.1% of antioxidant into a mixer for premixing for 150 s; and (3) putting the mixed polypropylene into a double-screw extruder, wherein 0.5% of compound electret is mainly added through a side feeding port, and extruding to obtain the high-oiliness particle filtering efficiency melt-blown material.
The preparation method of the high oily particle filtration efficiency meltblown material of comparative example 5, comprising the following steps in sequence: the method comprises the following steps: ultrasonic crushing 31% tourmaline powder and 49% fluorine-containing polymer in solvent, adding 20% oleophobic agent, mixing to obtain compound electret, filtering, oven drying, and grinding to obtain powdered particles. Step two: putting 98.8% of ultrahigh-flow polypropylene and 0.2% of antioxidant into a mixer for premixing for 150 s; and (3) putting the mixed polypropylene into a double-screw extruder, wherein 1.0% of compound electret is mainly added through a side feeding port, and extruding to obtain the high-oiliness particle filtering efficiency melt-blown material.
The preparation method of the high oily particle filtration efficiency meltblown material of comparative example 6, comprising the following steps in sequence: the method comprises the following steps: ultrasonic crushing 21% tourmaline powder and 65% fluorine-containing polymer in solvent, adding 14% oleophobic agent, mixing to obtain compound electret, filtering, oven drying, and grinding to obtain powdered particles. Step two: putting 98.8% of ultrahigh-flow polypropylene and 0.2% of antioxidant into a mixer for premixing for 150 s; and (3) putting the mixed polypropylene into a double-screw extruder, wherein 1.0% of compound electret is mainly added through a side feeding port, and extruding to obtain the high-oiliness particle filtering efficiency melt-blown material.
The preparation method of the high oily particle filtration efficiency meltblown material of comparative example 7, comprising the following steps in sequence: the method comprises the following steps: ultrasonic crushing 26% tourmaline powder and 60% fluorine-containing polymer in solvent, adding 14% oleophobic agent, mixing to obtain compound electret, filtering, oven drying, and grinding to obtain powdered particles. Step two: putting 99.3% of ultrahigh-flow polypropylene and 0.2% of antioxidant into a mixer for premixing for 150 s; and (3) putting the mixed polypropylene into a double-screw extruder, wherein 0.5% of compound electret is mainly added through a side feeding port, and extruding to obtain the high-oiliness particle filtering efficiency melt-blown material.
Table 1 shows the main data technical indicators:
| typical characteristics | Typical value | Unit of | Test standard |
| Melt mass flow rate, 230 ℃/2.16kg | 1400-1800 | g/10min | GB/T3682 |
| Molecular weight distribution, 150 deg.C | <3 | / | GPC |
| Volatile matter, 105 deg.C | <0.2 | % | GB/T 2914 |
| Oily particle filtration efficiency, 0.3um | ≥95 | % | / |
| Bacteria filtration efficiency of 2.5um | ≥98 | % | / |
And manufacturing a sample according to the standard to detect various technical properties.
Table 2 shows the properties of the examples
As can be seen from Table 2, when the addition amount of the compound electret is less than 0.5%, the filtration efficiency on oily particles is low, and the filtration efficiency measured after 48 hours is poor; when the addition amount of the compound electret is more than 1.0, the hole blocking phenomenon is easy to occur, and the production efficiency is influenced; when the composition proportion of the compound electret is more than 30 percent and the addition amount of the compound electret is more than 1.0 percent, the holes are easy to be blocked; when the composition proportion of the compound electret is more than 60 percent and the addition amount of the compound electret is more than 1.0 percent, the hole blocking is easy to occur; when the proportion of the composition of the compound electret is less than 20 percent and the addition amount of the compound electret is less than 0.5, the filtering efficiency of the material is lower than the requirement; when the composition proportion of the compound electret is less than 50 percent, the addition proportion of the fluorine-containing polymer is less than 0.5 percent, and the filtering efficiency of the material is lower than the requirement.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The high-oiliness particle filtration efficiency melt-blown material is characterized by comprising the following raw materials in percentage by weight:
98.5-99.4% of ultrahigh-flow polypropylene
0.1 to 0.5 percent of antioxidant
0.5 to 1 percent of compound electret agent
Wherein the compound electret agent consists of the following raw materials in percentage by weight
20 to 30 percent of tourmaline powder
Fluorine-containing polymer 50-60%
15-30% of oleophobic agent.
2. The high oily particle filtration efficiency meltblown material according to claim 1, wherein: the ultrahigh flow polypropylene is homopolypropylene with a melt index of 1400-1800.
3. The high oily particle filtration efficiency meltblown material according to claim 1, wherein: the oleophobic agent is a fluorocarbon surfactant or a fluorine-silicon surfactant, and the molecular chain contains one or more fluorine atoms.
4. The high oily particle filtration efficiency meltblown material according to claim 1, wherein: the tourmaline powder comprises 3000-mesh magnesium tourmaline powder and lithium tourmaline powder.
5. The high oily particle filtration efficiency meltblown material according to claim 1, wherein: the fluorine-containing polymer comprises any one of polytetrafluoroethylene, polyvinylidene fluoride, fluorinated ethylene propylene, ethylene and tetrafluoroethylene copolymer resin.
6. The high oily particle filtration efficiency meltblown material according to claim 1, wherein: the preparation process of the compound electret agent comprises the following steps: ultrasonic crushing tourmaline powder and fluorine-containing polymer in solvent, sequentially adding oleophobic agent, mixing, filtering, oven drying, and grinding to obtain powder with particle diameter of 0.2-1.5 μm; after ultrasonic crushing, the particle size of the crushed particles is 0.5-1.0 um; in the mixing process, the stirring frequency during mixing is 40 HZ; in the drying process, the drying temperature is 100 ℃, and the water content after drying is 0.03%; in the ultrasonic process, the frequency of the ultrasonic is 15 KHz-25 KHz, the time of the ultrasonic is 2-3 min, stirring is accompanied in the ultrasonic process, and the stirring frequency is 45-55 Hz.
7. A preparation method of a melt-blown material with high oily particle filtration efficiency is characterized by comprising the following steps: a formulation for a high oily particle filtration efficiency meltblown material according to any of claims 1-6 prepared by: adding the ultrahigh-flow polypropylene and the antioxidant into a mixer for premixing for 150 s; and (3) putting the mixed polypropylene into a double-screw extruder, adding a compound electret agent through a side feeding port, and extruding at 220-250 ℃ to obtain the high-oiliness particle filtering efficiency melt-blown material.
8. The method for preparing the high oily particle filtration efficiency melt-blown material according to claim 7, wherein the method comprises the following steps: wherein the length-diameter ratio of a screw of the double-screw extruder is 40-48; temperature of each temperature control zone: the temperature of the temperature control 1-2 zone is 200-220 ℃, the temperature of the temperature control 3-4 zone is 230-.
9. Use of a high oily particle filtration efficiency meltblown material, characterized by: use of a high oily particle filtration efficiency meltblown material according to any of claims 1-6 for the manufacture of meltblown fabric masks.
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