CN111876902A - Melt-blown non-woven fabric electret adding device and adding method thereof - Google Patents
Melt-blown non-woven fabric electret adding device and adding method thereof Download PDFInfo
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- CN111876902A CN111876902A CN202010641213.8A CN202010641213A CN111876902A CN 111876902 A CN111876902 A CN 111876902A CN 202010641213 A CN202010641213 A CN 202010641213A CN 111876902 A CN111876902 A CN 111876902A
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/56—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D1/00—Treatment of filament-forming or like material
- D01D1/06—Feeding liquid to the spinning head
- D01D1/065—Addition and mixing of substances to the spinning solution or to the melt; Homogenising
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/098—Melt spinning methods with simultaneous stretching
- D01D5/0985—Melt spinning methods with simultaneous stretching by means of a flowing gas (e.g. melt-blowing)
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- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
- Filtering Materials (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Nonwoven Fabrics (AREA)
Abstract
The invention discloses a melt-blown non-woven fabric electret adding device and an adding method thereof, the melt-blown non-woven fabric electret adding device comprises a spinneret plate and a receiving device, a melt channel is arranged in the spinneret plate, a triangular block is arranged on the spinneret plate, the bottom edge of the triangular block is fixedly connected with the spinneret plate, spinneret holes are arranged in the triangular block and communicated with the melt channel, air knives are arranged on the left side and the right side of the triangular block, the two air knives are symmetrically distributed in the left-right direction by taking the spinneret holes as the center, a drafting air flow channel is formed between the top of each air knife and the spinneret plate, one side of each air knife is close to the triangular block and is provided with an air outlet, the other side of each air knife is far away from the triangular block, an air gap is formed between one side of each air knife close to the triangular, the spinneret plate is positioned right above the air knife. The invention has the beneficial effects that: the spinneret orifice can not be blocked.
Description
Technical Field
The invention relates to the technical field of melt-blown non-woven fabrics, in particular to a melt-blown non-woven fabric electret adding device and a melt-blown non-woven fabric electret adding method.
Background
The non-woven fabric is prepared with polymer chip with high melt index MFI, and through heating and melting in extruder to form high temperature polymer melt, spraying the melt from the spinneret hole to form fine spinning flow, clamping the high temperature melt flow with high speed hot air flow in two sides, drawing and stretching to form superfine fiber. The fibers are gathered into a net structure on a receiving device, and the fibers are mutually bonded into a non-woven fabric form by utilizing the residual heat of the incompletely cooled melt.
The common melt-blown non-woven fabric has large air resistance, and in order to reduce the air resistance, electret modification is adopted in the industry. The air resistance of the melt-blown fiber non-woven fabric with the electrets is much smaller than that of the common melt-blown non-woven fabric, so that the filtering performance of the melt-blown material is greatly improved, and the addition of the electrets is very important.
The existing electret adding method of melt-blown non-woven fabric is that an electret is firstly mixed and co-extruded with a matrix polymer (such as polypropylene) to form an electret master batch. Melt-blown fiber resin and electret master batch are added into an extruder at the same time for blending and melting, the mixture is sprayed out through a spinneret orifice to form filaments, high-speed hot air flow clamps high-temperature melt fine flow, the high-temperature melt fine flow is drawn and stretched to receive a web, and carriers generated by electric field partial discharge of the fiber web are captured by a charge trap of an electret in the electret master batch under the action of high-voltage static electricity, so that the fibers obtain static electricity, and the melt-blown electret filter non-woven fabric material is obtained. Common electret materials include: tourmaline, silicon dioxide, etc.
There are many disadvantages to existing electret blending addition methods. First, it is difficult to adjust the amount of the additive over a wide range. The electret is generally inorganic material such as tourmaline, and too much tourmaline can reduce the toughness of melt-blown fiber, generate phenomena such as filament breakage and the like, but weaken the filtration efficiency, so the addition amount is not suitable to be too much; if the addition amount of the tourmaline is too small, the electret effect is not good, and the improvement on the filtration efficiency is limited. Secondly, the large-particle-size particles in the inorganic electret material are easy to block the spinneret orifices, so that shutdown maintenance is caused, the production efficiency of melt-blown fibers is reduced, and the cost is increased.
Disclosure of Invention
The invention provides a melt-blown non-woven fabric electret adding device and method for overcoming the defect that large-particle-size particles in an inorganic electret material are easy to block a spinneret orifice in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a melt-blown non-woven fabric electret adding device comprises a spinneret plate and a receiving device, wherein a melt channel is arranged in the spinneret plate, a triangular block is arranged on the spinneret plate, the bottom edge of the triangular block is fixedly connected with the spinneret plate, spinneret holes are formed in the triangular block and communicated with the melt channel, air knives are arranged on the left side and the right side of the triangular block, the two air knives are symmetrically distributed in the left-right direction by taking the spinneret holes as the center, a drafting air flow channel is formed between the top of each air knife and the spinneret plate, one side of each air knife is close to the triangular block and provided with an air outlet, the other side of each air knife is far away from the triangular block, an air gap is formed between one side of each air knife close to the triangular block and the side edge of the triangular block, the air outlet is located at the bottom of each air knife and located below the spinneret holes, one end of the drafting air, the receiving device is positioned right below the spinneret orifice and the air knife, and the spinneret plate is positioned right above the air knife.
The spinneret plate is internally provided with a melt channel, the spinneret plate is provided with a triangular block, the bottom edge of the triangular block is fixedly connected with the spinneret plate, a spinneret hole is arranged in the triangular block and is communicated with the melt channel, air knives are arranged on the left side and the right side of the triangular block, the two air knives are symmetrically distributed in the left-right direction by taking the spinneret hole as the center, a drafting air flow channel is formed between the top of each air knife and the spinneret plate, one side of each air knife is close to the triangular block and is provided with an air outlet, the other side of each air knife is far away from the triangular block, an air gap is formed between one side of each air knife close to the triangular block and the side edge of the triangular block, the air outlet is positioned at the bottom of each air knife and is positioned below the spinneret hole, one end of the drafting air flow channel is communicated with the spinneret hole through. Adding the melt-blown fiber resin into an extruder for melting, and spraying the melt-blown fiber resin through a spinneret orifice to form filaments. Meanwhile, the electret is dispersed into aerosol with certain concentration and particle diameter by the aerosol generator, added into the drafting airflow pipeline, clamped with the high-speed hot airflow generated by the hot airflow device together, drawn and stretched to form a superfine fiber shape, and the electret can be attached to the outer surface of the high-temperature melt. And cooling air flow flows out from an air outlet of the air knife to cool the high-temperature melt trickle, so that the high-temperature melt trickle is received by the receiving device and condensed into a web, and a carrier generated by the partial discharge of the electric field is captured by a charge trap of an electret in the electret master batch under the action of a high-voltage electrostatic field of the fiber web, so that the fiber obtains static electricity, and the melt-blown electret filter non-woven fabric is obtained. By the method provided by the invention, the electret material is dispersed on the outer surface of the melt-blown fiber, and a 'shredded coconut bread' type distribution structure is obtained. Whereas the previous method, by electret/fibrous resin blend addition, resulted in a "grape pie" type distribution structure. The electret is added through an air gap, does not pass through a melt channel and cannot block a spinneret orifice, so that the production efficiency is improved, the cost is reduced, and the aim of not blocking the spinneret orifice easily is fulfilled.
Preferably, the draft air flow path forms an obtuse angle with the air gap. The design is convenient for aerosol and high-speed hot air generated by the hot air flow device to be mixed and flow to the end part of the spinneret orifice through the drafting air flow channel and the air gap in sequence, the high-temperature melt trickle is clamped, and the superfine fiber form is formed after the drafting and the stretching, so that the electret can be attached to the outer surface of the high-temperature melt.
Preferably, one end of the melt channel is positioned at the top of the spinneret plate, the other end of the melt channel is positioned at the bottom of the spinneret plate and communicated with the spinneret orifice, and the diameter of one end of the melt channel positioned at the top of the spinneret plate is larger than that of the other end of the melt channel. The design is convenient for melt-blown fiber resin to be added through the large-diameter end of the melt channel after being melted by the extruder, and the small-diameter end of the melt channel flows through the spinneret orifice and is used for ejecting filaments through the spinneret orifice, so that the design is reasonable, and the utilization rate of the melt-blown fiber resin is improved.
Preferably, the hot air flow device is provided with a mixing box, the aerosol generator is provided with a jet orifice, the aerosol generator is communicated with the interior of the mixing box through the jet orifice, one end of the mixing box is respectively communicated with the aerosol generator and the hot air flow device, the other end of the mixing box is communicated with the drafting air flow channel, and the mixing box is internally provided with a flow guide device. The electret is dispersed into aerosol with certain concentration and particle diameter by the aerosol generator, and the aerosol is firstly mixed uniformly with high-speed hot air generated by the hot air device in the mixing box, and is guided by the guide device to be uniformly dispersed into the drafting air flow channel and the air gap, so that the high-temperature melt trickle is clamped, and the mixing and dispersing uniformity of the aerosol and the high-speed hot air is improved.
Preferably, the hot air flow device comprises an air compressor and an air heater, one end of the air heater is connected with the air compressor, the other end of the air heater is connected with the mixing box, and the air compressor is communicated with the inside of the mixing box through the air heater. The air compressor machine produces high-speed air current, and air heater heats high-speed air current and forms high-speed hot gas flow and aerosol and mixes and heat high temperature melt trickle when carrying out the centre gripping, prevents that high temperature melt trickle from cooling and solidifying.
Preferably, one end of the mixing box communicated with the drafting airflow channel is provided with a switching port, one end of the switching port is matched with the mixing box, the other end of the switching port is matched with the drafting airflow channel, the mixing box is communicated with the drafting airflow channel through the switching port, the flow guide device comprises a flow guide impeller and a plurality of flow guide plates, the aerosol generator and the air heater are both positioned on one side of the flow guide impeller, the switching port is positioned on the other side corresponding to the flow guide impeller, the flow guide plates are positioned in the switching port and fixedly connected with the inner side wall of the switching port, the inside of the switching port is divided into a plurality of flow guide cavities with the same volume through the plurality of flow guide plates, the inside of the mixing box is communicated with the drafting airflow channel through the plurality of flow guide cavities, part of the mixing box is curved, and the part of the. The electret is dispersed into aerosol with certain concentration and certain particle diameter by the aerosol generator, the aerosol is firstly preliminarily mixed with high-speed hot air generated by the air compressor through the air heater in the mixing box, and then the aerosol and the high-speed hot air are mixed and guided by the guide impeller, so that the flowing and mixing speed of the aerosol and the high-speed hot air is improved; the mixed air flow enters the part of the mixing box in a curve shape, and the molecules in the mixed air flow change the motion direction after the mixed air flow is collided by the side wall of the mixing box, so that the mixing of the molecules of the mixed air flow is accelerated, the mixed air flow is fully mixed, and the mixing efficiency is improved; and finally, the mixed gas flow is guided into the guide cavity through the guide plate, so that the mixed gas flow is uniformly dispersed into the drafting gas flow channel and the air gap, and the high-temperature melt trickle is clamped, thereby improving the mixing and dispersing uniformity of the aerosol and the high-speed hot gas flow.
The invention also provides a melt-blown non-woven fabric electret adding method, which comprises the following steps:
firstly, melt-blown fiber resin is added into an extruder to be melted, and high-temperature melt spinning trickle is sprayed out through a spinneret orifice, and simultaneously, an electret is dispersed into aerosol with certain concentration and particle diameter through an aerosol generator and added into a drafting airflow channel to be mixed with high-speed hot airflow;
step two, mixing the aerosol with high-speed hot air, then entering an air gap through a drafting air flow channel, blowing out the mixture through compressed air, clamping two sides of the high-temperature melt spinning trickle, and forming a superfine fiber state after traction and stretching;
and step three, attaching the electret particles to the surface of the high-temperature melt of the melt-blown fiber, and cooling to form the melt-blown fiber coated with the electret particles.
The original electret adding mode in the industry is blending, namely, the electret such as tourmaline is physically blended with melt-blown resin. The addition of tourmaline is limited, and the addition is too high (generally not more than 3%), which causes the fiber toughness to be reduced, the filament breakage phenomenon occurs, and the filtering performance is reduced. The method adopts the electret which is added through the drafting airflow channel after the melt-blown resin is formed into fibers, and the electret is sprayed and coated outside the fibers, so that the addition amount of the tourmaline can be greatly increased (more than 8 percent), the electret effect is obviously enhanced, and the aim of not easily blocking a spinneret orifice is fulfilled, thereby improving the production efficiency and reducing the cost; the electret is coated outside the melt-blown fiber, and compared with the blending modification in the fiber matrix, the electret effect on the fiber surface is better, the electrostatic voltage is higher, the electrostatic maintenance is more durable, and the stability of the filtering performance is better.
Preferably, the electret aerosol concentration is 1-10g/m3Preferably 3g/m3。
Preferably, the electret particles have an average diameter of 0.03 to 3 μm; preferably 0.05-0.5. mu.m.
Preferably, the material used for the electret is tourmaline or fumed silica.
The invention has the beneficial effects that: the adjustable range of the addition amount of the electret material in the fiber is enlarged; the spinneret orifice can not be blocked, so that the production efficiency is improved, and the cost is reduced; the electret is coated outside the melt-blown fiber, and compared with the blending modification in the fiber matrix, the electret effect on the fiber surface is better, the electrostatic voltage is higher, the electrostatic maintenance is more durable, and the stability of the filtering performance is better.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a top plan view of the hot gas flow device and mixing box of FIG. 1;
FIG. 3 is a plot of electret addition versus fiber QF value for examples 1 and 3;
FIG. 4 is a plot of the amount of electret added versus fiber QF value for examples 2 and 4.
In the figure: 1. the spinneret plate comprises a spinneret plate body, a receiving device, a melt channel, a triangular block, a spinneret hole, an air knife, a drafting airflow channel, an air outlet, an air gap, an aerosol generator, a hot airflow device, a mixing box, a jet opening, an air compressor, an air heater, an adapter opening, a diversion impeller, a diversion plate and a diversion cavity, wherein the spinneret plate body comprises 2 parts of a receiving device, 3 parts of a melt channel, 4 parts of a triangular block, 5 parts of a spinneret hole, 6 parts of an air knife, 7 parts of a drafting airflow channel, 8 parts of an air outlet.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
In the embodiment shown in fig. 1, a melt-blown non-woven fabric electret adding device comprises a spinneret plate 1 and a receiving device 2, a melt channel 3 is arranged in the spinneret plate 1, a triangular block 4 is arranged on the spinneret plate 1, the bottom edge of the triangular block 4 is fixedly connected with the spinneret plate 1, a spinneret hole 5 is arranged in the triangular block 4, the spinneret hole 5 is communicated with the melt channel 3, air knives 6 are arranged on the left side and the right side of the triangular block 4, the two air knives 6 are symmetrically distributed in the left-right direction by taking the spinneret hole 5 as the center, a drafting air flow channel 7 is formed between the top of the air knife 6 and the spinneret plate 1, one side of the air knife 6 is close to the triangular block 4 and is provided with an air outlet 8, the other side of the air knife 6 is far away from the triangular block 4, an air gap 9 is formed between one side of the air knife 6 close to the triangular block 4 and the side of the triangular block 4, the other end of the drafting airflow channel 7 is provided with an aerosol generator 10 and a hot airflow device 11, the receiving device 2 is positioned right below the spinneret orifice 5 and the air knife 6, and the spinneret plate 1 is positioned right above the air knife 6. The draft air flow path 7 forms an obtuse angle with the air gap 9. One end of the melt channel 3 is positioned at the top of the spinneret plate 1, the other end of the melt channel 3 is positioned at the bottom of the spinneret plate 1 and communicated with the spinneret orifice 5, and the diameter of one end of the melt channel 3 positioned at the top of the spinneret plate 1 is larger than that of the other end.
As shown in fig. 1, a mixing box 12 is provided on the hot air flow device 11, a jet orifice 13 is provided on the aerosol generator 10, the aerosol generator 10 is communicated with the inside of the mixing box 12 through the jet orifice 13, one end of the mixing box 12 is respectively communicated with the aerosol generator 10 and the hot air flow device 11, the other end of the mixing box 12 is communicated with the drafting air flow channel 7, and a flow guide device is provided in the mixing box 12. The hot air flow device 11 comprises an air compressor 14 and an air heater 15, one end of the air heater 15 is connected with the air compressor 14, the other end of the air heater 15 is connected with the mixing box 12, and the air compressor 14 is communicated with the interior of the mixing box 12 through the air heater 15.
As shown in fig. 1 and fig. 2, an adapter 16 is provided at one end of the mixing box 12 communicating with the drafting airflow channel 7, one end of the adapter 16 matches with the mixing box 12, the other end of the adapter 16 matches with the drafting airflow channel 7, the mixing box 12 communicates with the drafting airflow channel 7 through the adapter 16, the guiding device includes a guiding impeller 17 and a plurality of guiding plates 18, the aerosol generator 10 and the air heater 15 are both located at one side of the guiding impeller 17, the adapter 16 is located at the other side corresponding to the guiding impeller 17, the guiding plates 18 are located in the adapter 16 and fixedly connected with the inner side wall of the adapter 16, the interior of the adapter 16 is divided into a plurality of guiding cavities 19 with the same volume by the plurality of guiding plates 18, the interior of the mixing box 12 communicates with the drafting airflow channel 7 through the plurality of guiding cavities 19, and part of the mixing box 12 is curved, the curved portion of the mixing box 12 is located between the adapter 16 and the inducer 17.
The invention also provides a melt-blown non-woven fabric electret adding method which is characterized by comprising the following steps:
firstly, melt-blown fiber resin is added into an extruder to be melted, high-temperature melt spinning trickle is sprayed out through a spinneret orifice 5, and simultaneously an electret is dispersed into aerosol with certain concentration and certain particle diameter through an aerosol generator 10 and added into a drafting airflow channel 7 to be mixed with high-speed hot airflow;
secondly, the aerosol is mixed with high-speed hot air flow, enters an air gap 9 through a drafting air flow channel 7, is blown out by compressed air, clamps two sides of the high-temperature melt spinning trickle, and forms a superfine fiber state after being drawn and stretched;
and step three, attaching the electret particles to the surface of the high-temperature melt of the melt-blown fiber, and cooling to form the melt-blown fiber coated with the electret particles.
The electret aerosol concentration is 1-10g/m3Preferably 3g/m3。
The average diameter of the electret particles is 0.03-3 μm; preferably 0.05-0.5. mu.m.
The material adopted by the electret is tourmaline or fumed silica.
The comprehensive performance of the electret modified melt-blown fibers is evaluated by the index QF. QF is calculated using the following formula: QF ═ ln (1-efficiency%)/drag. The larger the QF, the better the combination properties of the filter material.
Example 1: the electret material tourmaline and melt index MFI 1500 polypropylene are mixed and co-extruded to form the electret master batch. By meltingThe melt index MFI is 1800 polypropylene particles, melt-blown fiber resin and electret master batch (the adding mass percentage of tourmaline is 0.5-6.2 wt%) are simultaneously added into an extruder for melt blending, the extrusion temperature is 250 ℃, the melt temperature is 255 ℃, the blend is sprayed out through a spinneret orifice to form filaments in a form of a blend, a spinning trickle is formed, the temperature of a spinning box is 255 ℃, high-speed hot air flows on two sides of the spinning box clamp the high-temperature melt trickle, the traction air temperature is 265 ℃, and an ultrafine fiber form is formed after traction and stretching. Gathering into a net structure on a receiving device at a certain speed, and the gram weight is about 30g/m2. The fiber net is under the action of high-voltage static electricity (10kV) to obtain the melt-blown electret filter non-woven fabric material. The efficiency (particle size of the test particles is 0.3 μm, surface wind speed of the test material is 5.3cm/s) and air resistance were tested at a surface wind speed of 5.3 cm/s. And calculating the QF value. The performances of the melt-blown fiber obtained by blending and adding the tourmaline electret described in the embodiment 1 are shown in the following table 1:
TABLE 1
Example 2: gas phase method SiO for electret material2Mixing and co-extruding the mixture with polypropylene with the melt index MFI of 1500 to form the electret master batch. Adopts polypropylene particles with melt index MFI of 1800, melt-blown fiber resin and electret master batch (SiO)20.5-4.3 wt%) and simultaneously adding the mixture into an extruder for melt blending, wherein the extrusion temperature is 250 ℃, the melt temperature is 255 ℃, the mixture is sprayed out through a spinneret orifice to form a filament, the temperature of a spinning box is 255 ℃, high-speed hot air flows are arranged on two sides of the filament to clamp the high-temperature melt filament, the temperature of drawing air is 265 ℃, and the ultra-fine fiber form is formed after drawing and stretching. Gathering into a net structure on a receiving device at a certain speed, and the gram weight is about 30g/m2. The fiber net is under the action of high-voltage static electricity (10kV) to obtain the melt-blown electret filter non-woven fabric material. The efficiency of the test is tested under the condition that the surface wind speed is 5.3cm/s (test)Particle size of the test particles is 0.3 μm, surface wind speed of the test material is 5.3cm/s) and air resistance. And calculating the QF value. The tourmaline is added in the amount of SiO in the final fiber product2Is calculated according to the mass percentage of (1). Using the SiO described in example 22Electret, melt blown fiber properties obtained by the blend addition process are shown in table 2:
TABLE 2
Example 3: adding polypropylene particles with melt index MFI of 1800 into an extruder for melt extrusion, wherein the extrusion temperature is 250 ℃, the melt temperature is 255 ℃, and the polypropylene particles are sprayed out through a spinneret orifice to form filaments, so that a spinning fine flow is formed, and the temperature of a spinning box is 255 ℃. The tourmaline powder is dispersed into a concentration of 1-10g/m by aerosol generator3And aerosol with the average particle diameter of 0.1 mu m is added into a drawing airflow pipeline, the temperature of drawing air is 265 ℃, tourmaline entering air gaps of a melt-blown assembly is blown out along with high-speed hot air flow at two sides of the spinning trickle. The electret is attached to the high-temperature melt. The spinning stream is drawn and stretched by high-speed airflow to form an ultrafine fiber form. Gathering into a net structure on a receiving device at a certain speed, and the gram weight is about 30g/m2. The fiber net is under the action of high-voltage static electricity (10kV) to obtain the melt-blown electret filter non-woven fabric material. The efficiency (particle size of the test particles is 0.3 μm, surface wind speed of the test material is 5.3cm/s) and air resistance were tested at a surface wind speed of 5.3 cm/s. And calculating the QF value. The addition amount of tourmaline is calculated by the mass percentage of actual tourmaline in the final fiber product. The performances of the melt-blown fiber obtained by the addition method of the tourmaline electret described in the embodiment 3 are shown in the table 3:
TABLE 3
Example 4: adding polypropylene particles with melt index MFI of 1800 into an extruder for melt extrusion, wherein the extrusion temperature is 250 ℃, the melt temperature is 255 ℃, and the polypropylene particles are sprayed out through a spinneret orifice to form filaments, so that a spinning fine flow is formed, and the temperature of a spinning box is 255 ℃. Gas phase method of SiO2The powder is dispersed into 2-10g/m concentration by aerosol generator3And aerosol with the average particle diameter of 0.08 mu m is added into a drafting airflow pipeline, the temperature of the drafting airflow is 265 ℃, and the aerosol enters tourmaline of the air gap of the melt-blown assembly and is blown out along with high-speed hot airflow at two sides of the spinning trickle. The electret is attached to the high-temperature melt. The spinning stream is drawn and stretched by high-speed airflow to form an ultrafine fiber form. Gathering into a net structure on a receiving device at a certain speed, and the gram weight is about 30g/m2. The fiber net is under the action of high-voltage static electricity (10kV) to obtain the melt-blown electret filter non-woven fabric material. The efficiency (particle size of the test particles is 0.3 μm, surface wind speed of the test material is 5.3cm/s) and air resistance were tested at a surface wind speed of 5.3 cm/s. And calculating the QF value. Gas phase SiO2In an amount corresponding to the actual SiO in the final fiber product2Is calculated according to the mass percentage of (1). The SiO described in example 4 was used2Electret, melt blown fiber properties obtained by the addition process according to the invention are shown in table 4:
TABLE 4
As shown in fig. 3, in comparative example 1 and example 3, tourmaline is used as the electret material, the blending method and the method according to the present invention are respectively used, and the QF value of the fiber obtained by the adding method according to the present invention is greater than the QF value of the fiber obtained by the blending method under the condition of different electret adding amounts. Meanwhile, the blending method is adopted, the addition amount of the tourmaline is limited, and is too high (generally not more than 3%), so that the fiber toughness is reduced, the filament breakage phenomenon occurs, and the filtering performance is reduced. By adopting the method, the addition of the tourmaline can be greatly increased (up to more than 8 percent), and the electret effect is obviously enhanced.
As shown in FIG. 4, in both comparative example 2 and example 4, SiO was used as the electret material2The blending method and the method related to the invention are respectively adopted, and under the condition of different electret adding amounts, the QF value of the fiber obtained by adopting the adding method related to the invention is larger than that of the fiber obtained by adopting the blending method. While using a blending process, SiO2The addition amount of the tourmaline is limited, the addition amount is too high, the fiber toughness is reduced, the filament breakage phenomenon is caused, and the filtering performance is reduced on the contrary.
In conclusion, the comprehensive performance of the filter material of the adding method is superior to that of the filter material of the blending method. The method adopts the electret which is added through the drafting airflow channel after the melt-blown resin is formed into fiber, and the electret is sprayed and coated outside the fiber, so that the addition of tourmaline can be greatly improved, the electret effect is obviously enhanced, and the aim of not easily blocking a spinneret orifice is fulfilled, thereby improving the production efficiency and reducing the cost; the electret is coated outside the melt-blown fiber, and compared with the blending modification in the fiber matrix, the electret effect on the fiber surface is better, the electrostatic voltage is higher, the electrostatic maintenance is more durable, and the stability of the filtering performance is better.
Claims (10)
1. A melt-blown non-woven fabric electret adding device is characterized by comprising a spinneret plate (1) and a receiving device (2), wherein a melt channel (3) is arranged in the spinneret plate (1), a triangular block (4) is arranged on the spinneret plate (1), the bottom edge of the triangular block (4) is fixedly connected with the spinneret plate (1), spinneret holes (5) are arranged in the triangular block (4), the spinneret holes (5) are communicated with the melt channel (3), air knives (6) are arranged on the left side and the right side of the triangular block (4), the two air knives (6) are symmetrically distributed left and right by taking the spinneret holes (5) as centers, a drafting air flow channel (7) is formed between the top of each air knife (6) and the spinneret plate (1), one side of each air knife (6) is close to the triangular block (4) and is provided with an air outlet (8), and the other side of each air knife (6) is far, an air gap (9) is formed between one side, close to the triangular block (4), of the air knife (6) and the side edge of the triangular block (4), the air outlet (8) is located at the bottom of the air knife (6) and located below the spinneret orifice (5), one end of the drafting airflow channel (7) is communicated with the spinneret orifice (5) through the air gap (9), an aerosol generator (10) and a hot air flow device (11) are arranged at the other end of the drafting airflow channel (7), the receiving device (2) is located under the spinneret orifice (5) and the air knife (6), and the spinneret plate (1) is located over the air knife (6).
2. The electret adding device of the melt-blown non-woven fabric according to claim 1, wherein an included angle formed by the drafting airflow channel (7) and the air gap (9) is an obtuse angle.
3. The melt-blown non-woven fabric electret adding device according to claim 1 or 2, wherein one end of the melt channel (3) is positioned at the top of the spinneret plate (1), the other end of the melt channel (3) is positioned at the bottom of the spinneret plate (1) and is communicated with the spinneret orifice (5), and the diameter of one end of the melt channel (3) positioned at the top of the spinneret plate (1) is larger than that of the other end.
4. The electret adding device of the melt-blown non-woven fabric according to claim 1, wherein a mixing box (12) is arranged on the hot air flow device (11), a jet orifice (13) is arranged on the aerosol generator (10), the aerosol generator (10) is communicated with the inside of the mixing box (12) through the jet orifice (13), one end of the mixing box (12) is respectively communicated with the aerosol generator (10) and the hot air flow device (11), the other end of the mixing box (12) is communicated with the drafting air flow channel (7), and a flow guide device is arranged in the mixing box (12).
5. The electret adding device of the melt-blown non-woven fabric according to claim 4, wherein the hot air flow device (11) comprises an air compressor (14) and an air heater (15), one end of the air heater (15) is connected with the air compressor (14), the other end of the air heater (15) is connected with the mixing box (12), and the air compressor (14) is communicated with the inside of the mixing box (12) through the air heater (15).
6. The melt-blown non-woven fabric electret adding device according to claim 5, wherein an adapter port (16) is arranged at one end of the mixing box (12) communicated with the drafting airflow channel (7), one end of the adapter port (16) is matched with the mixing box (12), the other end of the adapter port (16) is matched with the drafting airflow channel (7), the mixing box (12) is communicated with the drafting airflow channel (7) through the adapter port (16), the flow guide device comprises a flow guide impeller (17) and a plurality of flow guide plates (18), the aerosol generator (10) and the air heater (15) are both positioned at one side of the flow guide impeller (17), the adapter port (16) is positioned at the other side corresponding to the flow guide impeller (17), and the flow guide plates (18) are positioned in the adapter port (16) and fixedly connected with the inner side wall of the adapter port (16), the inside of switching mouth (16) is separated into a plurality of water conservancy diversion chamber (19) of the same volume through a plurality of water conservancy diversion chamber (18), the inside of mixing box (12) is linked together through a plurality of water conservancy diversion chamber (19) and draft airflow channel (7), the partial shape of mixing box (12) is the curve type, the part that the shape of mixing box (12) is the curve type is located between switching mouth (16) and water conservancy diversion impeller (17).
7. A melt-blown non-woven fabric electret adding method is characterized by comprising the following steps:
firstly, melt-blown fiber resin is added into an extruder to be melted, high-temperature melt spinning trickle is sprayed out through a spinneret orifice (5), and simultaneously, an electret is dispersed into aerosol with certain concentration and certain particle diameter through an aerosol generator (10) and added into a drafting airflow channel (7) to be mixed with high-speed hot air;
secondly, the aerosol is mixed with high-speed hot air flow, enters an air gap (9) through a drafting air flow channel (7), is blown out by compressed air, clamps two sides of the high-temperature melt spinning trickle, and forms a superfine fiber state after being dragged and stretched;
and step three, attaching the electret particles to the surface of the high-temperature melt of the melt-blown fiber, and cooling to form the melt-blown fiber coated with the electret particles.
8. The method as claimed in claim 7, wherein the electret aerosol concentration is 1-10g/m3Preferably 3g/m3。
9. The method as claimed in claim 7, wherein the electret particles have an average diameter of 0.03-3 μm; preferably 0.05-0.5. mu.m.
10. The method for adding the electret of the melt-blown non-woven fabric according to claim 7, wherein the electret is made of tourmaline or fumed silica.
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| CN202010641213.8A CN111876902A (en) | 2020-07-06 | 2020-07-06 | Melt-blown non-woven fabric electret adding device and adding method thereof |
| PCT/CN2020/114599 WO2022007181A1 (en) | 2020-07-06 | 2020-09-10 | Melt-blown nonwoven fabric electret adding device and adding method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010641213.8A CN111876902A (en) | 2020-07-06 | 2020-07-06 | Melt-blown non-woven fabric electret adding device and adding method thereof |
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| CN111876902A true CN111876902A (en) | 2020-11-03 |
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| WO (1) | WO2022007181A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113417076A (en) * | 2021-06-23 | 2021-09-21 | 海南欣龙无纺股份有限公司 | Wormwood finishing melt-blown fabric and preparation method and application thereof |
| CN115029803A (en) * | 2022-07-26 | 2022-09-09 | 北京化工大学 | Novel melt-blown machine shower nozzle structure |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115559023B (en) * | 2022-08-25 | 2024-03-15 | 易高碳材料控股(深圳)有限公司 | Spinning component and method for preparing superfine-diameter asphalt-based carbon fiber by using same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS62263361A (en) * | 1986-05-09 | 1987-11-16 | 東レ株式会社 | Production of nonwoven fabric |
| CN100491620C (en) * | 2007-03-06 | 2009-05-27 | 天津工业大学 | Production and production equipment for functional micro granule modified melt-jetting non-woven cloth |
| CN105297288A (en) * | 2015-11-12 | 2016-02-03 | 江阴金港无纺布有限公司 | Preparation device for melt-blown non-woven fabric |
| CN105908376A (en) * | 2016-03-09 | 2016-08-31 | 海宁市卫太生物科技有限公司 | Environment-friendly antibacterial melt-blown non-woven fabric and preparation method thereof |
| CN212426370U (en) * | 2020-07-06 | 2021-01-29 | 浙江宸唯环保科技股份有限公司 | Melt-blown non-woven fabric electret adds device |
-
2020
- 2020-07-06 CN CN202010641213.8A patent/CN111876902A/en active Pending
- 2020-09-10 WO PCT/CN2020/114599 patent/WO2022007181A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113417076A (en) * | 2021-06-23 | 2021-09-21 | 海南欣龙无纺股份有限公司 | Wormwood finishing melt-blown fabric and preparation method and application thereof |
| CN115029803A (en) * | 2022-07-26 | 2022-09-09 | 北京化工大学 | Novel melt-blown machine shower nozzle structure |
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| WO2022007181A1 (en) | 2022-01-13 |
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