CN112981701A - Multilayer melt-blown non-woven fabric and preparation method thereof - Google Patents
Multilayer melt-blown non-woven fabric and preparation method thereof Download PDFInfo
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- CN112981701A CN112981701A CN202110346518.0A CN202110346518A CN112981701A CN 112981701 A CN112981701 A CN 112981701A CN 202110346518 A CN202110346518 A CN 202110346518A CN 112981701 A CN112981701 A CN 112981701A
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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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- 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
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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
- D04H1/413—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 containing granules other than absorbent substances
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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
- D04H1/44—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling
- D04H1/46—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
- D04H1/492—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres by fluid jet
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- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
- Nonwoven Fabrics (AREA)
Abstract
A multilayer melt-blown non-woven fabric comprises an upper melt-blown non-woven fabric layer, a middle melt-blown non-woven fabric layer and a lower melt-blown non-woven fabric layer; the preparation method of the multilayer melt-blown non-woven fabric comprises the steps of preparing a surface layer melt-blown non-woven fabric, preparing a middle layer melt-blown non-woven fabric, preparing a fine filter layer melt-blown non-woven fabric and compounding. The preparation method of the multilayer melt-blown non-woven fabric has the advantages that: the production stability is improved, and the requirements on raw materials are reduced; the peculiar smell of the produced melt-blown fabric can be eliminated; the toughness of the multilayer melt-blown non-woven fabric can be improved, and the problem of over-hardness or over-brittleness can not be caused; the prepared melt-blown non-woven fabric has the advantages that: the bacteriostasis rate to escherichia coli can reach 99.92 percent, and the bacteriostasis rate to staphylococcus aureus can reach 99.94 percent; the bursting strength can reach 497N, and after 100 times of standard washing, the bursting strength can still reach 450N and the like.
Description
Technical Field
The invention relates to the field of melt-blown fabric production, in particular to a multilayer melt-blown non-woven fabric and a preparation method thereof.
Background
The melt-blown fabric mainly takes polypropylene as a main raw material, the fiber diameter can reach 1-5 microns, the voids are large, the structure is fluffy, the anti-wrinkle capacity is good, the number and the surface area of fibers in unit area can be increased by the superfine fibers with unique capillary structures, so that the melt-blown fabric has good filtering property, shielding property, heat insulation property and oil absorption property, and the melt-blown fabric can be used in the fields of air, liquid filtering materials, isolating materials, absorbing materials, mask materials, heat-insulating materials, oil absorption materials, wiping fabrics and the like.
However, meltblown fabrics also have the following problems: has no antibacterial property; the production is unstable, the requirement on the stability of the raw materials is high, the same materials are used well in some cases, and the cloth cannot be sprayed after a few days; the sprayed cloth is distributed with peculiar smell; the melt-blown fabric has poor toughness and is fragile and easy to break; the filter has better filtering effect only on particles with single particle size; the problems of over-hardness, easy tearing and the like are easy to occur.
Patent CN111497390A discloses a composite multilayer melt-blown fiber material for air filtration, which comprises, from inside to outside in sequence: the thermoplastic polyurethane melt-blown non-woven fiber layer, the first polypropylene melt-blown non-woven fiber layer, the polylactic acid melt-blown non-woven fiber layer, the SEBS melt-blown non-woven fiber layer and the second polypropylene melt-blown non-woven fiber layer. The patent has the following defects: the composite multilayer meltblown fiber material is prone to stiffening and tearing.
Patent CN111876905A discloses a multilayer melt-blown nonwoven fabric and a preparation method thereof, the multilayer melt-blown nonwoven fabric is composed of a layer a melt-blown nonwoven fabric, a layer B melt-blown nonwoven fabric and a layer C melt-blown nonwoven fabric layer, the layer a melt-blown nonwoven fabric is arranged on the layer B melt-blown nonwoven fabric, and the layer C melt-blown nonwoven fabric is arranged on the lower portion of the layer B melt-blown nonwoven fabric. A multi-layer melt-blown non-woven fabric is a melt-blown non-woven fabric consisting of 3 different fiber diameters of an A layer melt-blown non-woven fabric, a B layer melt-blown non-woven fabric and a C layer melt-blown non-woven fabric. The patent has the following defects: the multilayer melt-blown non-woven fabric is unstable in production, has high requirements on the stability of raw materials, sometimes the same materials are used well, the fabric cannot be sprayed after a few days, and the sprayed fabric has peculiar smell.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a preparation method of a multilayer melt-blown non-woven fabric, which can improve the production stability, reduce the requirements on raw materials, eliminate the peculiar smell of the produced melt-blown fabric, improve the toughness and antibacterial property of the melt-blown fabric, ensure that the produced melt-blown fabric has better filtering effect on particles with various particle sizes, and is not easy to cause the problems of over hardness, easy tearing and the like.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a multilayer melt-blown non-woven fabric consists of an upper melt-blown non-woven fabric layer, a middle melt-blown non-woven fabric layer and a lower melt-blown non-woven fabric layer.
A method for preparing a multilayer melt-blown nonwoven fabric, comprising: preparing surface layer melt-blown non-woven fabric, preparing middle layer melt-blown non-woven fabric, preparing fine filter layer melt-blown non-woven fabric and compounding.
The fiber diameter of the surface layer melt-blown non-woven fabric is 2-3 mu m, and the surface density is 7-9g/m2The thickness is 0.06-0.08 mm; the fiber diameter of the middle layer is 4-6 μm, and the surface density is 14-16g/m2The thickness is 0.1-0.12 mm; the fiber diameter of the fine filter layer melt-blown non-woven fabric is 7-9 μm, and the surface density is 20-23g/m2The thickness is 0.15-0.17 mm.
Preparing a surface layer melt-blown non-woven fabric, namely blending 100-110 parts by weight of polypropylene chips, 3-5 parts by weight of graphene oxide powder, 2-3 parts by weight of styrene-butadiene-3-chloropropene copolymer and 1-2 parts by weight of nano silver antibacterial powder in a mixer, wherein the rotating speed of the mixer is 300-350rpm, and the mixing time is 8-10 min; then putting the mixture into a double-screw extruder for melting, and setting the temperature of the double-screw extruder to be 260-280 ℃; and after the melting is finished, extruding the melted melt through a spinneret plate, wherein the length-diameter ratio of the spinneret plate is 8-10:1, drafting at a high speed through hot air flow to form nascent fiber, wherein the temperature of the hot air flow is 240-260 ℃, and the pressure of the hot air flow is 0.8-0.9MPa, cooling the nascent fiber through cold air at the temperature of 20-25 ℃ to form a net, and rolling to obtain the surface layer melt-blown non-woven fabric.
Preparing the intermediate layer melt-blown non-woven fabric, namely blending 100-110 parts by weight of polypropylene chips, 2-4 parts by weight of zinc stearate, 4-6 parts by weight of volcanic rock powder, 6-7 parts by weight of nano tourmaline powder, 2-3 parts by weight of styrene-butadiene-3-chloropropene copolymer and 3-5 parts by weight of nano zeolite powder in a mixer, wherein the rotating speed of the mixer is 280-300rpm, and the mixing time is 7-9 min; then putting the mixture into a double-screw extruder for melting, and setting the temperature of the double-screw extruder to 230-250 ℃; and after the melting is finished, extruding the melted melt through a spinneret plate, wherein the length-diameter ratio of the spinneret plate is 7-9:1, drafting at high speed through hot air flow to form nascent fiber, wherein the temperature of the hot air flow is 230-240 ℃, and the pressure of the hot air flow is 0.6-0.7MPa, cooling the nascent fiber through cold air at the temperature of 20-25 ℃ to form a net, and rolling to obtain the surface layer melt-blown non-woven fabric.
The particle size of the nano tourmaline powder is 90-110 nm.
The particle size of the nano zeolite powder is 50-70 nm.
Preparing fine filter layer melt-blown non-woven fabric, blending 100-110 parts by weight of polypropylene chips, 20-25 parts by weight of polyethylene chips, 3-5 parts by weight of light calcium carbonate and 2-3 parts by weight of magnesium sulfate in a mixer, wherein the rotating speed of the mixer is 240-260rpm, and the mixing time is 5-7 min; then putting the mixture into a double-screw extruder for melting, and setting the temperature of the double-screw extruder to 200-210 ℃; and after the melting is finished, extruding the melted melt through a spinneret plate, wherein the length-diameter ratio of the spinneret plate is 5-7:1, drafting at a high speed through hot air flow to form primary fibers, wherein the temperature of the hot air flow is 220-230 ℃, and the pressure of the hot air flow is 0.5-0.6MPa, cooling the primary fibers through cold air at the temperature of 20-25 ℃ to form a net, and rolling to obtain the fine filter layer melt-blown non-woven fabric.
And the surface layer melt-blown non-woven fabric, the middle layer melt-blown non-woven fabric and the fine filter layer melt-blown non-woven fabric are overlapped together in sequence from top to bottom, and water needling formed by high-pressure fine water flow is utilized to carry out water needling, so that the surface layer melt-blown non-woven fabric, the middle layer melt-blown non-woven fabric and the fine filter layer melt-blown non-woven fabric are combined.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the preparation method of the multilayer melt-blown non-woven fabric, various functional auxiliaries are added into the prepared surface layer melt-blown non-woven fabric, the middle layer melt-blown non-woven fabric and the fine filter layer melt-blown non-woven fabric, so that the production stability can be improved, and the requirements on raw materials are reduced;
(2) according to the preparation method of the multilayer melt-blown non-woven fabric, volcanic rock powder and nano zeolite powder are added in the preparation of the intermediate layer melt-blown non-woven fabric, so that the peculiar smell of the produced melt-blown fabric can be eliminated;
(3) according to the multilayer melt-blown non-woven fabric prepared by the invention, the surface layer melt-blown non-woven fabric, the middle layer melt-blown non-woven fabric and the fine filtration layer melt-blown non-woven fabric are compounded together by using a spunlace technology, so that the toughness of the multilayer melt-blown non-woven fabric can be improved, and the problem of over-hardness or over-brittleness cannot be caused;
(4) according to the multilayer melt-blown non-woven fabric prepared by the invention, the antibacterial property of the multilayer melt-blown non-woven fabric can be improved by adding the nano-silver antibacterial powder in the preparation of the surface layer melt-blown non-woven fabric, and refer to GB/T20944.3-2008' evaluation part 3 of antibacterial property of textiles: the multilayer melt-blown non-woven fabric is tested by an oscillation method to have the bacteriostasis rate on escherichia coli and staphylococcus aureus as high as 99.92% and 99.94% respectively;
(5) the multilayer melt-blown non-woven fabric prepared by the invention has a good filtering effect on particulate matters with various particle sizes by layer-by-layer filtering of the surface layer melt-blown non-woven fabric, the middle layer melt-blown non-woven fabric and the fine filtering layer melt-blown non-woven fabric, and according to the GB 2626-; the filtration resistance was 22Pa when the respiratory flow was 95 liters/min, and the filtration efficiency was 93.7% when the respiratory flow was 95 liters/min.
(6) According to the multilayer melt-blown non-woven fabric prepared by the invention, various functional auxiliaries are added into the prepared surface layer melt-blown non-woven fabric, the middle layer melt-blown non-woven fabric and the fine filtration layer melt-blown non-woven fabric, so that the tear resistance of the multilayer melt-blown non-woven fabric can be improved, the bursting strength can reach 497N according to the GB/T14800 and 2010 standard, and the bursting strength can still reach 450N after 100 times of standard washing.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, specific embodiments of the present invention will now be described.
Example 1
A multilayer melt-blown non-woven fabric consists of an upper melt-blown non-woven fabric layer, a middle melt-blown non-woven fabric layer and a lower melt-blown non-woven fabric layer.
A method for preparing a multilayer melt-blown nonwoven fabric, comprising: preparing surface layer melt-blown non-woven fabric, preparing middle layer melt-blown non-woven fabric, preparing fine filter layer melt-blown non-woven fabric and compounding.
The fiber diameter of the surface layer melt-blown non-woven fabric is 2 mu m, and the surface density is 7g/m2The thickness is 0.06 mm; the fiber diameter of the middle layer is 4 μm, and the surface density is 14g/m2The thickness is 0.1 mm; the fiber diameter of the fine filter layer melt-blown non-woven fabric is 7 mu m, and the surface density is 20g/m2The thickness is 0.15 mm.
Preparing a surface layer melt-blown non-woven fabric, namely blending 100 parts by weight of polypropylene slices, 3 parts by weight of graphene oxide powder, 2 parts by weight of styrene-butadiene-3-chloropropene copolymer and 1 part by weight of nano-silver antibacterial powder in a mixer, wherein the rotating speed of the mixer is 300rpm, and the mixing time is 8 min; then putting the mixture into a double-screw extruder for melting, and setting the temperature of the double-screw extruder to be 260 ℃; and after the melting is finished, extruding the melted melt through a spinneret plate, wherein the length-diameter ratio of the spinneret plate is 8:1, drafting at a high speed through hot air flow to form nascent fiber, wherein the temperature of the hot air flow is 240 ℃, the pressure of the hot air flow is 0.8MPa, cooling the nascent fiber through cold air at the temperature of 20 ℃ to form a web, and rolling to obtain the surface layer melt-blown non-woven fabric.
The preparation method comprises the steps of preparing intermediate layer melt-blown non-woven fabric, blending 100 parts by weight of polypropylene slices, 2 parts by weight of zinc stearate, 4 parts by weight of volcanic powder, 6 parts by weight of nano tourmaline powder, 2 parts by weight of styrene-butadiene-3-chloropropene copolymer and 3 parts by weight of nano zeolite powder in a mixer, wherein the rotating speed of the mixer is 280rpm, and the mixing time is 7 min; then putting the mixture into a double-screw extruder for melting, and setting the temperature of the double-screw extruder to 230 ℃; and after the melting is finished, extruding the melted melt through a spinneret plate, wherein the length-diameter ratio of the spinneret plate is 7:1, drafting at a high speed through hot air flow to form nascent fiber, wherein the temperature of the hot air flow is 230 ℃, the pressure of the hot air flow is 0.6MPa, cooling the nascent fiber through cold air at the temperature of 20 ℃ to form a web, and rolling to obtain the surface layer melt-blown non-woven fabric.
The particle size of the nano tourmaline powder is 90 nm.
The particle size of the nano zeolite powder is 50 nm.
Preparing fine filter layer melt-blown non-woven fabric, blending 100 parts by weight of polypropylene slices, 20 parts by weight of polyethylene slices, 3 parts by weight of light calcium carbonate and 2 parts by weight of magnesium sulfate in a mixer, wherein the rotating speed of the mixer is 240rpm, and the mixing time is 5 min; then putting the mixture into a double-screw extruder for melting, and setting the temperature of the double-screw extruder to be 200 ℃; and after the melting is finished, extruding the melted melt through a spinneret plate, wherein the length-diameter ratio of the spinneret plate is 5:1, drafting at a high speed through hot air flow to form primary fibers, wherein the temperature of the hot air flow is 220 ℃, the pressure of the hot air flow is 0.5MPa, cooling the primary fibers through cold air at the temperature of 20 ℃ to form a web, and rolling to obtain the fine filter layer melt-blown non-woven fabric.
And the surface layer melt-blown non-woven fabric, the middle layer melt-blown non-woven fabric and the fine filter layer melt-blown non-woven fabric are overlapped together in sequence from top to bottom, and water needling formed by high-pressure fine water flow is utilized to carry out water needling, so that the surface layer melt-blown non-woven fabric, the middle layer melt-blown non-woven fabric and the fine filter layer melt-blown non-woven fabric are combined.
Reference is made to GB/T20944.3-2008 < evaluation of antibacterial properties of textiles section 3: the multilayer melt-blown nonwoven fabric of the embodiment is tested by an oscillation method to have 99.98% of inhibition rate on escherichia coli and 99.94% of inhibition rate on staphylococcus aureus; referring to GB 2626-2006 standard, when the respiratory flow is 35L/min, the filtration resistance is 9Pa, and when the respiratory flow is 35L/min, the filtration efficiency is 99.1%; when the respiratory flow is 95 liters/minute, the filtration resistance is 20Pa, and when the respiratory flow is 95 liters/minute, the filtration efficiency is 93.9 percent; referring to GB/T14800-.
Example 2
A multilayer melt-blown non-woven fabric consists of an upper melt-blown non-woven fabric layer, a middle melt-blown non-woven fabric layer and a lower melt-blown non-woven fabric layer.
A method for preparing a multilayer melt-blown nonwoven fabric, comprising: preparing surface layer melt-blown non-woven fabric, preparing middle layer melt-blown non-woven fabric, preparing fine filter layer melt-blown non-woven fabric and compounding.
The fiber diameter of the surface layer melt-blown non-woven fabric is 2 mu m, and the surface density is 8g/m2The thickness is 0.07 mm; the fiber diameter of the middle layer is 5 μm, and the surface density is 15g/m2The thickness is 0.11 mm; the fiber diameter of the fine filter layer melt-blown non-woven fabric is 8 mu m, and the surface density is 22g/m2And the thickness is 0.16 mm.
Preparing a surface layer melt-blown non-woven fabric, namely blending 105 parts by weight of polypropylene slices, 4 parts by weight of graphene oxide powder, 2 parts by weight of styrene-butadiene-3-chloropropene copolymer and 2 parts by weight of nano-silver antibacterial powder in a mixer, wherein the rotating speed of the mixer is 320rpm, and the mixing time is 9 min; then putting the mixture into a double-screw extruder for melting, and setting the temperature of the double-screw extruder to be 270 ℃; and after the melting is finished, extruding the melted melt through a spinneret plate, wherein the length-diameter ratio of the spinneret plate is 9:1, drafting at a high speed through hot air flow to form nascent fiber, wherein the temperature of the hot air flow is 250 ℃, the pressure of the hot air flow is 0.8MPa, cooling the nascent fiber through cold air at the temperature of 22 ℃ to form a web, and rolling to obtain the surface layer melt-blown non-woven fabric.
The preparation method comprises the following steps of preparing intermediate layer melt-blown non-woven fabric, blending 105 parts by weight of polypropylene slices, 3 parts by weight of zinc stearate, 5 parts by weight of volcanic rock powder, 6 parts by weight of nano tourmaline powder, 2 parts by weight of styrene-butadiene-3-chloropropene copolymer and 4 parts by weight of nano zeolite powder in a mixer, wherein the rotating speed of the mixer is 290rpm, and the mixing time is 8 min; then putting the mixture into a double-screw extruder for melting, and setting the temperature of the double-screw extruder to 240 ℃; and after the melting is finished, extruding the melted melt through a spinneret plate, wherein the length-diameter ratio of the spinneret plate is 8:1, drafting at a high speed through hot air flow to form nascent fiber, wherein the temperature of the hot air flow is 235 ℃, the pressure of the hot air flow is 0.6MPa, cooling the nascent fiber through cold air at the temperature of 22 ℃ to form a web, and rolling to obtain the surface layer melt-blown non-woven fabric.
The particle size of the nano tourmaline powder is 100 nm.
The particle size of the nano zeolite powder is 60 nm.
Preparing fine filter layer melt-blown non-woven fabric, blending 105 parts by weight of polypropylene slices, 22 parts by weight of polyethylene slices, 4 parts by weight of light calcium carbonate and 2 parts by weight of magnesium sulfate in a mixer, wherein the rotating speed of the mixer is 250rpm, and the mixing time is 6 min; then putting the mixture into a double-screw extruder for melting, and setting the temperature of the double-screw extruder to be 205 ℃; and after the melting is finished, extruding the melted melt through a spinneret plate, wherein the length-diameter ratio of the spinneret plate is 6:1, drafting at a high speed through hot air flow to form primary fibers, wherein the temperature of the hot air flow is 225 ℃, the pressure of the hot air flow is 0.5MPa, cooling the primary fibers through cold air at the temperature of 22 ℃ to form a web, and rolling to obtain the fine filter layer melt-blown non-woven fabric.
And the surface layer melt-blown non-woven fabric, the middle layer melt-blown non-woven fabric and the fine filter layer melt-blown non-woven fabric are overlapped together in sequence from top to bottom, and water needling formed by high-pressure fine water flow is utilized to carry out water needling, so that the surface layer melt-blown non-woven fabric, the middle layer melt-blown non-woven fabric and the fine filter layer melt-blown non-woven fabric are combined.
Reference is made to GB/T20944.3-2008 < evaluation of antibacterial properties of textiles section 3: the multilayer melt-blown nonwoven fabric of the embodiment is tested by an oscillation method to have 99.92% of inhibition rate on escherichia coli and 99.95% of inhibition rate on staphylococcus aureus; referring to GB 2626-2006 standard, when the respiratory flow is 35L/min, the filtration resistance is 10Pa, and when the respiratory flow is 35L/min, the filtration efficiency is 99.3%; when the respiratory flow is 95 liters/minute, the filtration resistance is 20Pa, and when the respiratory flow is 95 liters/minute, the filtration efficiency is 93.7 percent; according to the GB/T14800-2010 standard, the bursting strength can reach 497N, and after 100 times of standard washing, the bursting strength can still reach 457N.
Example 3
A multilayer melt-blown non-woven fabric consists of an upper melt-blown non-woven fabric layer, a middle melt-blown non-woven fabric layer and a lower melt-blown non-woven fabric layer.
A method for preparing a multilayer melt-blown nonwoven fabric, comprising: preparing surface layer melt-blown non-woven fabric, preparing middle layer melt-blown non-woven fabric, preparing fine filter layer melt-blown non-woven fabric and compounding.
The fiber diameter of the surface layer melt-blown non-woven fabric is 3 mu m, and the surface density is 9g/m2The thickness is 0.08 mm; the fiber diameter of the middle layer is 6 μm, and the surface density is 16g/m2The thickness is 0.12 mm; the fiber diameter of the fine filter layer melt-blown non-woven fabric is 9 mu m, and the surface density is 23g/m2And the thickness is 0.17 mm.
Preparing a surface layer melt-blown non-woven fabric, namely blending 110 parts by weight of polypropylene slices, 5 parts by weight of graphene oxide powder, 3 parts by weight of styrene-butadiene-3-chloropropene copolymer and 2 parts by weight of nano-silver antibacterial powder in a mixer, wherein the rotating speed of the mixer is 350rpm, and the mixing time is 10 min; then putting the mixture into a double-screw extruder for melting, and setting the temperature of the double-screw extruder to 280 ℃; and after the melting is finished, extruding the melted melt through a spinneret plate, wherein the length-diameter ratio of the spinneret plate is 10:1, drafting at a high speed through hot air flow to form nascent fiber, wherein the temperature of the hot air flow is 260 ℃, the pressure of the hot air flow is 0.9MPa, cooling the nascent fiber through cold air at the temperature of 25 ℃ to form a web, and rolling to obtain the surface layer melt-blown non-woven fabric.
The preparation method comprises the steps of preparing a middle-layer melt-blown non-woven fabric, blending 110 parts by weight of polypropylene slices, 4 parts by weight of zinc stearate, 6 parts by weight of volcanic rock powder, 7 parts by weight of nano tourmaline powder, 3 parts by weight of styrene-butadiene-3-chloropropene copolymer and 5 parts by weight of nano zeolite powder in a mixer, wherein the rotating speed of the mixer is 300rpm, and the mixing time is 9 min; then putting the mixture into a double-screw extruder for melting, and setting the temperature of the double-screw extruder to be 250 ℃; and after the melting is finished, extruding the melted melt through a spinneret plate, wherein the length-diameter ratio of the spinneret plate is 9:1, drafting at high speed through hot air flow to form nascent fiber, wherein the temperature of the hot air flow is 240 ℃, the pressure of the hot air flow is 0.7MPa, cooling the nascent fiber through cold air at 25 ℃ to form a web, and rolling to obtain the surface layer melt-blown non-woven fabric.
The particle size of the nano tourmaline powder is 110 nm.
The particle size of the nano zeolite powder is 70 nm.
Preparing fine filter layer melt-blown non-woven fabric, blending 110 parts by weight of polypropylene slices, 25 parts by weight of polyethylene slices, 5 parts by weight of light calcium carbonate and 3 parts by weight of magnesium sulfate in a mixer, wherein the rotating speed of the mixer is 260rpm, and the mixing time is 7 min; then putting the mixture into a double-screw extruder for melting, and setting the temperature of the double-screw extruder to 210 ℃; and after the melting is finished, extruding the melted melt through a spinneret plate, wherein the length-diameter ratio of the spinneret plate is 7:1, drafting at a high speed through hot air flow to form primary fibers, wherein the temperature of the hot air flow is 230 ℃, the pressure of the hot air flow is 0.6MPa, cooling the primary fibers through cold air at the temperature of 25 ℃, forming a net, and rolling to obtain the fine filter layer melt-blown non-woven fabric.
And the surface layer melt-blown non-woven fabric, the middle layer melt-blown non-woven fabric and the fine filter layer melt-blown non-woven fabric are overlapped together in sequence from top to bottom, and water needling formed by high-pressure fine water flow is utilized to carry out water needling, so that the surface layer melt-blown non-woven fabric, the middle layer melt-blown non-woven fabric and the fine filter layer melt-blown non-woven fabric are combined.
Reference is made to GB/T20944.3-2008 < evaluation of antibacterial properties of textiles section 3: the multilayer melt-blown nonwoven fabric of the embodiment is tested by an oscillation method to have 99.92% of inhibition rate on escherichia coli and 99.98% of inhibition rate on staphylococcus aureus; referring to GB 2626-2006 standard, when the respiratory flow is 35L/min, the filtration resistance is 10Pa, and when the respiratory flow is 35L/min, the filtration efficiency is 98.9%; when the respiratory flow is 95 liters/minute, the filtration resistance is 22Pa, and when the respiratory flow is 95 liters/minute, the filtration efficiency is 93.7 percent; referring to GB/T14800-.
All percentages used in the present invention are mass percentages unless otherwise indicated.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A multilayer melt-blown non-woven fabric is characterized by consisting of an upper melt-blown non-woven fabric layer, a middle melt-blown non-woven fabric layer and a lower melt-blown non-woven fabric layer.
2. A method for preparing a multilayer melt-blown nonwoven fabric is characterized by comprising the following steps: preparing surface layer melt-blown non-woven fabric, preparing middle layer melt-blown non-woven fabric, preparing fine filter layer melt-blown non-woven fabric and compounding.
3. The method for preparing multilayer melt-blown nonwoven fabric according to claim 2, wherein the fiber diameter of the top layer melt-blown nonwoven fabric is 2 to 3 μm, and the surface density is 7 to 9g/m2The thickness is 0.06-0.08 mm; the fiber diameter of the middle layer is 4-6 μm, and the surface density is 14-16g/m2The thickness is 0.1-0.12 mm; the fiber diameter of the fine filter layer melt-blown non-woven fabric is 7-9 μm, and the surface density is 20-23g/m2The thickness is 0.15-0.17 mm.
4. The method for preparing the multilayer melt-blown non-woven fabric according to claim 2, wherein the preparation of the surface layer melt-blown non-woven fabric comprises the steps of blending 100-110 parts by weight of polypropylene chips, 3-5 parts by weight of graphene oxide powder, 2-3 parts by weight of styrene-butadiene-3-chloropropene copolymer and 1-2 parts by weight of nano silver antibacterial powder in a mixer, wherein the rotating speed of the mixer is 300-350rpm, and the mixing time is 8-10 min; then putting the mixture into a double-screw extruder for melting, and setting the temperature of the double-screw extruder to be 260-280 ℃; and after the melting is finished, extruding the melted melt through a spinneret plate, wherein the length-diameter ratio of the spinneret plate is 8-10:1, drafting at a high speed through hot air flow to form nascent fiber, wherein the temperature of the hot air flow is 240-260 ℃, and the pressure of the hot air flow is 0.8-0.9MPa, cooling the nascent fiber through cold air at the temperature of 20-25 ℃ to form a net, and rolling to obtain the surface layer melt-blown non-woven fabric.
5. The preparation method of the multilayer melt-blown non-woven fabric according to claim 2, wherein the preparation of the intermediate layer melt-blown non-woven fabric comprises the steps of blending 100-110 parts by weight of polypropylene chips, 2-4 parts by weight of zinc stearate, 4-6 parts by weight of volcanic powder, 6-7 parts by weight of nano tourmaline powder, 2-3 parts by weight of styrene-butadiene-3-chloropropene copolymer and 3-5 parts by weight of nano zeolite powder in a mixer, wherein the rotation speed of the mixer is 280-300rpm, and the mixing time is 7-9 min; then putting the mixture into a double-screw extruder for melting, and setting the temperature of the double-screw extruder to 230-250 ℃; and after the melting is finished, extruding the melted melt through a spinneret plate, wherein the length-diameter ratio of the spinneret plate is 7-9:1, drafting at high speed through hot air flow to form nascent fiber, wherein the temperature of the hot air flow is 230-240 ℃, and the pressure of the hot air flow is 0.6-0.7MPa, cooling the nascent fiber through cold air at the temperature of 20-25 ℃ to form a net, and rolling to obtain the surface layer melt-blown non-woven fabric.
6. The method for preparing multilayer melt-blown nonwoven fabric according to claim 5, wherein the particle size of the nano tourmaline powder is 90-110 nm.
7. The method of claim 5, wherein the particle size of the nano zeolite powder is 50-70 nm.
8. The method for preparing the multilayer melt-blown non-woven fabric according to claim 2, wherein the fine-filtration layer melt-blown non-woven fabric is prepared by blending 100-110 parts by weight of polypropylene chips, 20-25 parts by weight of polyethylene chips, 3-5 parts by weight of light calcium carbonate and 2-3 parts by weight of magnesium sulfate in a mixer, wherein the rotation speed of the mixer is 240-260rpm, and the mixing time is 5-7 min; then putting the mixture into a double-screw extruder for melting, and setting the temperature of the double-screw extruder to 200-210 ℃; and after the melting is finished, extruding the melted melt through a spinneret plate, wherein the length-diameter ratio of the spinneret plate is 5-7:1, drafting at a high speed through hot air flow to form primary fibers, wherein the temperature of the hot air flow is 220-230 ℃, and the pressure of the hot air flow is 0.5-0.6MPa, cooling the primary fibers through cold air at the temperature of 20-25 ℃ to form a net, and rolling to obtain the fine filter layer melt-blown non-woven fabric.
9. The method for preparing a multilayer melt-blown nonwoven fabric according to claim 2, wherein the surface layer melt-blown nonwoven fabric, the middle layer melt-blown nonwoven fabric and the fine layer melt-blown nonwoven fabric are laminated together in the order from top to bottom, and the three are subjected to water jet by a water needle formed by high-pressure fine water flow to be compounded together to form the multilayer melt-blown nonwoven fabric.
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