阅读说明：本技术 一种新型熔喷非织造布及其制造方法与生产设备 (Novel melt-blown non-woven fabric and manufacturing method and production equipment thereof ) 是由 杨小燕 杨福兴 杨桂明 伍凯飞 苏建华 于 2020-07-22 设计创作，主要内容包括：本发明公开了一种新型熔喷非织造布及其制造方法与生产设备,所述新型熔喷非织造布的原料按质量百分比包括树脂颗粒94~99%、改性功能型颗粒1~6%；所述改性功能型颗粒按质量分数由100份功能型颗粒、1~4%的分散剂、1~6%的偶联剂组成；将改性功能颗粒与树脂颗粒充分干燥后混合,经过熔融、过滤后分流挤出,在高速空气流下拉伸喷射,在负压存在下黏附在接收装置的表面,随后冷却成型；本发明新型熔喷非织造布断裂强度高,杀菌效果好,制造方法具有工艺简单、熔体流动速率佳、流速分布均匀、熔喷压力大等特点。(The invention discloses a novel melt-blown non-woven fabric and a manufacturing method and production equipment thereof, wherein the raw materials of the novel melt-blown non-woven fabric comprise, by mass, 94-99% of resin particles and 1-6% of modified functional particles; the modified functional particles consist of 100 parts of functional particles, 1-4% of a dispersant and 1-6% of a coupling agent in percentage by mass; fully drying and mixing the modified functional particles and the resin particles, melting, filtering, shunting and extruding, stretching and spraying under high-speed air flow, adhering to the surface of a receiving device in the presence of negative pressure, and then cooling and forming; the novel melt-blown non-woven fabric has the characteristics of high breaking strength, good sterilization effect, simple process, good melt flow rate, uniform flow velocity distribution, high melt-blown pressure and the like.)

1. A novel melt-blown nonwoven fabric is characterized in that: the novel melt-blown non-woven fabric comprises raw materials of resin particles and modified functional particles, wherein the resin particles account for 94-99% by mass, and the corresponding modified functional particles account for 1-6% by mass.

2. A novel meltblown nonwoven as claimed in claim 1, wherein: the resin particles are polypropylene particles or polylactic acid particles, and the modified functional particles comprise 100 parts of functional particles, 1-4% of a dispersing agent and 1-6% of a coupling agent by mass.

3. A novel meltblown nonwoven as claimed in claim 2, wherein: the functional particles are inorganic particles and are one of silicon dioxide, zeolite, titanium oxide, activated carbon, talcum powder, montmorillonite, attapulgite or alumina.

4. A novel meltblown nonwoven as claimed in claim 2, wherein: the dispersing agent is one of polyethylene wax, OP-10 or polyethylene glycol 200.

5. A novel meltblown nonwoven as claimed in claim 2, wherein: the coupling agent is one of a silane coupling agent or a titanate coupling agent, the silane coupling agent is KH550, KH560, KH570 or SI-69, and the titanate coupling agent is CS-101, CS-102 or CS-311.

6. A method for manufacturing a novel melt-blown nonwoven fabric according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:

s01, pre-vacuum-drying the functional particles in a vacuum drying oven at 80 ℃ for 12 hours, adding the functional particles, a dispersing agent and a coupling agent into an ultrasonic reactor with ultrasonic frequency of 25khz, performing ultrasonic modification for 30-50 min, taking out and drying at 80 ℃ for 6-10 hours to obtain modified functional particles;

s02, drying the resin particles in a vacuum drying oven at 80 ℃ for 12 hours in vacuum in advance, adding the resin particles and the modified functional particles into a mixer with the rotating speed of 1500-2000 r/min for mixing, putting the mixture into a screw extruder, and melting in the screw extruder;

s03, filtering, putting into a melt-blowing die, heating to 350-450 ℃ by using pressure and 70-90 kpa of high-pressure air, and adding nano Ag⁺、Cu²⁺Mixing, namely blowing the molten material out of a melt-blowing die;

s04, adhering the novel melt-blown non-woven fabric on a receiving device under the negative pressure of 100-200Mpa, carrying out electrostatic treatment on the novel melt-blown non-woven fabric, and then forming after air cooling for 10-30min to complete the manufacture of the novel melt-blown non-woven fabric.

7. The production equipment of the novel melt-blown non-woven fabric according to claim 1, characterized in that: comprises a melt-blowing unit and a receiving unit;

the melt-blowing unit comprises a double-screw extruder (1), a filtering device (2), a flow divider (3), a melt-blowing die (4), an air supply device (5) and an air heater (6); the double-screw extruder (1) is used for melting and conveying raw materials, and the splitter (3) is used for splitting the molten raw materials filtered by the filtering device (2) and supplying the split molten raw materials to the melt-blowing die (4); the air supply device (5) and the air heater (6) are used for stretching and spraying the melted raw materials, and the air heater (6) is connected with the air supply device (5) and the melting die (4);

the receiving unit is used for receiving and processing the melt-blown fabric; the novel melt-blown non-woven fabric winding device comprises a receiving device (8) and a winding device (9), wherein the receiving device (8) is positioned behind a nozzle of a melt-blown die (4) and used for receiving a molten raw material and cooling the molten raw material into the novel melt-blown non-woven fabric, and the winding device (9) is positioned above the receiving device and used for winding the melt-blown non-woven fabric after cooling forming into a bundle.

8. The production equipment of the novel melt-blown non-woven fabric according to claim 7, characterized in that: the double-screw extruder (1) is provided with 6 barrels which are connected in sequence, the temperature of each section is 210 ℃, 230 ℃, 240 ℃, 245 ℃, 250 ℃ and 245 ℃, the rotating speed of a screw is 100r/min, and the length-diameter ratio of the barrels is 15-20.

9. The production equipment of the novel melt-blown non-woven fabric according to claim 7, characterized in that: the melt-blown unit is also provided with a spraying device (7) for adding nano Ag into the air heater (6)⁺、Cu²⁺(ii) a The receiving device (8) is internally provided with an electrostatic treatment device (10), and the voltage of the electrostatic treatment device (10) is 10-60 ten thousand volts.

10. The production equipment of the novel melt-blown non-woven fabric according to claim 7, characterized in that: the length-diameter ratio of each flow passage hole of the flow divider (3) is 20; the melt-blowing die (4) is provided with 200 spinneret orifices with the diameter of 0.3-0.5 mm.

Technical Field

The invention relates to the technical field of woven nonwovens, in particular to a novel melt-blown nonwoven fabric and a manufacturing method and production equipment thereof.

Background

Meltblown nonwoven is one of the polymer spunlaid nonwovens, which originated in the early century. At that time, the U.S. naval laboratory developed a filter material with ultrafine filtration for the collection of radioactive particles in the upper atmosphere with government support. This process is a prototype of modern melt blown nonwoven process technology. Companies have also begun to study meltblown nonwoven technology and have received a series of patents in the middle of the century.

The melt-blown process principle is that polymer melt is extruded from a die head spinneret orifice to form melt trickle, heated stretching air is blown out from air ducts on two sides of the die head spinneret orifice at high speed, namely air gaps, so that the polymer melt trickle is stretched. Cooling air is supplemented from two sides at a certain position below the die head to cool and crystallize the fibers, and in addition, a spraying device can be arranged below the cooling air device to further rapidly cool the fibers. A vacuum suction device is arranged below the web forming curtain of the receiving device, so that the superfine fibers formed by high-speed air flow drawing are uniformly collected on the web forming curtain or a roller of the receiving device and become the melt-blown non-woven material by self-bonding or other reinforcement methods.

At present, polypropylene is used as a raw material in the melt-blowing method for the most part. When polypropylene is used as the raw material, the melt index of the raw material is required to be as high as possible in order to allow the melt stream to be well drawn during the hot gas stream blowing process. In addition to the widely used polypropylene, polyphthalamines, polylactic acid, polyethylene, PBT, ethylene copolymers and some thermoplastic elastomer materials have also been used in melt blown nonwoven production to develop products meeting different performance requirements.

Most of domestic equipment uses the technology and equipment manufacture used in early foreign countries for reference, but in the existing equipment (including auxiliary equipment) manufacturing team, the technical personnel who can really contact the prototype of the foreign equipment and really know the prototype of the foreign equipment are few, and because the process principle is not innovated, the original technology is not deeply understood, so that the domestic equipment has great gap with the foreign equipment in the aspects of main economic and technical indexes such as process principle, equipment design, product level and the like.

Chinese patent CN 201710648132.9 discloses a modified polypropylene master batch, melt-blown fabric, a preparation method and application thereof, wherein the modified polypropylene master batch is mainly prepared from the following components: 77-90% of polypropylene, 5-20% of graphene material and 1-5% of auxiliary agent by weight percentage; the graphene material comprises any one or combination of more of graphene, graphene oxide and graphene derivatives; the auxiliary agent comprises any one or more of a coupling agent, a dispersing agent and an antioxidant, and preferably comprises the coupling agent, the dispersing agent and the antioxidant. When the modified polypropylene master batch is used for manufacturing the melt-blown fabric, the antibacterial property and the electrification property can be improved, and the filtering efficiency and the dust holding capacity of the melt-blown fabric can be improved.

Chinese patent CN 201210544735.1 discloses a tourmaline electret polylactic acid melt-blown non-woven fabric and a preparation method thereof, wherein tourmaline modified polylactic acid melt-blown superfine fiber with the fiber diameter range of 1-10 μm comprises polylactic acid, tourmaline (similar to the functional particles of the application) and an auxiliary agent, the mass of the tourmaline is 1-3% of that of the polylactic acid, the auxiliary agent comprises a coupling agent, a dispersing agent and a diluting agent, the coupling agent accounts for 2-3% of the mass of the tourmaline, the dispersing agent accounts for 1-3% of the mass of the tourmaline, and the diluting agent accounts for 3 times of the mass of the coupling agent. The invention has good filtering effect, no toxicity, no harm and environmental protection, but both the filtering effect and the environmental protection have the defects of complex manufacturing process, slow melt flow rate, uneven flow velocity distribution and the like.

Disclosure of Invention

The technical purpose is as follows: aiming at the defects of the existing melt-blown non-woven fabric, the invention discloses a novel melt-blown non-woven fabric which is simple in manufacturing process, good in melt flow rate, uniform in flow velocity distribution and high in melt-blown pressure, and a manufacturing method and production equipment thereof.

The technical scheme is as follows: in order to achieve the technical purpose, the invention adopts the following technical scheme:

the novel melt-blown non-woven fabric comprises, by mass, 94-99% of resin particles and 1-6% of modified functional particles.

Preferably, the resin particles are polypropylene particles or polylactic acid particles.

Preferably, the modified functional particles consist of 100 parts of functional particles, 1-4% of dispersant by mass and 1-6% of coupling agent by mass; adding the three components into an ultrasonic reactor with ultrasonic frequency of 25khz, carrying out ultrasonic modification for 30-50 min, and then drying at 80 ℃ for 6-10 h to obtain the modified functional particles.

Preferably, the functional particles refer to inorganic particles, and specifically include one of silica, zeolite, titanium oxide, activated carbon, talc, montmorillonite, attapulgite or alumina.

Preferably, the coupling agent is a silane coupling agent or a titanate coupling agent; the silane coupling agent is one of KH550, KH560, KH570 or SI-69, and the titanate coupling agent is one of CS-101, CS-102 or CS-311.

Preferably, the dispersant is polyethylene wax, OP-10 or polyethylene glycol 200.

The production equipment of the novel melt-blown non-woven fabric comprises a melt-blown unit and a receiving unit, wherein the melt-blown unit comprises a double-screw extruder, a filtering device, a flow divider, a melt-blown die, an air supply device and an air heater, the filtering device is used for filtering molten materials at the outlet of the double-screw extruder, and the flow divider is used for dividing the molten materials into a melt-blown die; the air heater is connected with an air supply device and the melting die.

Preferably, the double-screw extruder is provided with 6 machine barrels which are communicated in sequence and used for melting raw materials, and the length-diameter ratio of the machine barrels is 15-20; according to the melt flowing direction, the cylinder temperature is 210 ℃, 230 ℃, 240 ℃, 245 ℃, 250 ℃ and 245 ℃ in sequence, a feed inlet is arranged above the double-screw extruder, the rotating speed of the screw is 100r/min, the raw materials are fully melted, and the production quality is improved.

Preferably, the air pressure of the air supply device is 70-90 kpa, and the air heater heats the air to 350-450 ℃; a spraying device is arranged beside the air heater, and the nano Ag sprayed by the spraying device⁺、Cu²⁺The antibacterial agent is mixed with air in an air heater, so that the antibacterial treatment of the novel melt-blown non-woven fabric is improved, the antibacterial effect of the product is improved, and the sterilization rate reaches 99.8%.

Preferably, an electrostatic treatment device is further arranged in the receiving device, the voltage of the electrostatic treatment device is 10-60 ten thousand volts, and the electrostatic adsorption performance is improved.

Preferably, the flow divider is provided with two flow passage holes which are respectively connected with a melting port die, and the length-diameter ratio of the flow passage holes is 20, so that the flowing uniformity of the melt is ensured, and the outflow of the melt has certain pressure; 200 spinneret orifices with the diameter of 0.3-0.5 mm are formed at the end part of the melting neck ring mold.

The manufacturing method of the novel melt-blown non-woven fabric comprises the following steps:

s01, carrying out vacuum drying on resin particles in a vacuum drying oven at 80 ℃ for 12 hours in advance, adding the resin particles with the mass fraction of 94-99% and the modified functional particles with the mass fraction of 1-6% into a mixer with the rotating speed of 1500-2000 r/min, uniformly mixing, filling the mixture into a hopper of a double-screw extruder, melting in the screw extruder, and filtering out large particle structures through a filter.

S02, respectively flowing the raw materials after melting and filtering the raw materials through the flow passage holes of the flow dividerFeeding into two melting dies, heating with air heater by air supplied from air supply device, and spraying with nanometer Ag⁺、Cu²⁺After mixing, the molten material is blown out of the melt die orifice.

S03, the receiving device receives the molten material sprayed from the melting die, the built-in electrostatic treatment device carries out electrostatic treatment on the material, the material is made into the novel melt-blown non-woven fabric after being cooled by air for 10-30min, and the winding device winds up the cooled novel melt-blown non-woven fabric.

Has the advantages that: the novel melt-blown non-woven fabric and the manufacturing method and production equipment thereof provided by the invention have the following beneficial effects:

1. the manufacturing process is simple, the melt flow rate is good, the flow velocity distribution is uniform, and the melt-blowing pressure is high;

2. the flow divider is divided into two groups of melt-blown production lines, so that the melt-blown production efficiency is greatly improved, and the length-diameter ratio L/D of each flow passage hole is 20, so that the flowing uniformity of the melt can be ensured, and the melt can flow out with certain pressure;

3. a spraying device is respectively arranged beside the air heater and can be added with nano Ag⁺、Cu²⁺The materials are used for the antibacterial treatment of the melt-blown non-woven fabric, so that the antibacterial effect of the product is improved;

4. a high-voltage electrostatic treatment device is arranged below the winding device, and 10 ten thousand volts of voltage is applied to electrostatic treatment, so that the electrostatic adsorption performance of the material is greatly improved;

5. the width deviation of the melt-blown non-woven fabric product produced by the equipment and the method is controlled within +/-2 mm, the transverse breaking strength is 12.5N, the longitudinal breaking strength is 18.6N, and the longitudinal and transverse breaking elongation is 36.4%.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

FIG. 1 is a schematic structural diagram of a manufacturing apparatus for a novel melt-blown nonwoven fabric of the present invention;

FIG. 2 is a comparative graph of performance testing of a novel meltblown nonwoven made in accordance with an embodiment of the present invention;

wherein, the device comprises a 1-double screw extruder, a 2-filtering device, a 3-flow divider, a 4-melt blowing die, a 5-air supply device, a 6-air heater, a 7-spraying device, an 8-receiving device, a 9-winding device and a 10-electrostatic treatment device.

Detailed Description

The present invention will be more clearly and completely described below by way of examples and with reference to the accompanying drawings, but the present invention is not limited thereto.

A novel melt-blown non-woven fabric comprises the following raw materials in percentage by mass: 94-99% of resin particles and 1-6% of modified functional particles; the resin particles are polypropylene particles or polylactic acid particles, the modified functional particles consist of 100 parts of functional particles, 1-4% of dispersing agent and 1-6% of coupling agent according to mass fraction, and the functional particles are inorganic particles, and specifically are one of silicon dioxide, zeolite, titanium oxide, activated carbon, talcum powder, montmorillonite, attapulgite or alumina; the coupling agent is a silane coupling agent or a titanate coupling agent, the silane coupling agent is one of KH550, KH560, KH570 or SI-69, and the titanate coupling agent is one of CS-101, CS-102 or CS-311; the dispersing agent is polyethylene wax, OP-10 or polyethylene glycol 200.

As shown in fig. 1, the production equipment of the novel melt-blown non-woven fabric comprises a melt-blowing unit and a receiving unit, wherein the melt-blowing unit comprises a double-screw extruder 1, a filtering device 2 fixed at the outlet of the double-screw extruder 1, a splitter 3 and a melt-blowing die 4 connected behind the splitter 3, the receiving unit comprises a receiving device 8 and a winding device 9 fixed above the receiving device, and an electrostatic treatment device 10 is arranged in the receiving device 8.

The double-screw extruder 1 is provided with six barrels which are communicated in sequence and have the length-diameter ratio of 15-20 and are used for melting, and according to the flow direction of raw material melting, the temperatures of the barrels are 210 ℃, 230 ℃, 240 ℃, 245 ℃, 250 ℃ and 245 ℃ in sequence, and the rotating speed of screws is 100 r/min; the flow divider 3 is provided with two flow passage holes with the length-diameter ratio of 20, so that the flowing uniformity of a melt is ensured, the outflow of the melt is ensured to have certain pressure, the end parts of the flow passage holes are respectively connected with a melt-blowing port die 4, and 200 spinneret holes with the diameter of 0.3-0.5 mm are arranged on the spraying end surface of each melt-blowing port die 4.

Two ends of an air heater 6 are respectively communicated with an air supply device 5 and a melt-blowing port die 4, the air pressure provided by the air supply device 5 is 70-90 kpa, and the air heater 6 can heat air to 350-450 ℃; the spraying device 7 is used for adding the nano Ag into the air heater 6⁺、Cu²⁺And carrying out antibacterial treatment on the novel melt-blown non-woven fabric.

The receiving device 8 receives the molten raw material blown out from the spinneret orifice of the melt-blowing mouth die 4, and the molten raw material is cooled for 10-30min by air, and meanwhile, the electrostatic treatment device 10 performs electrostatic treatment on the cloth to improve the electrostatic adsorption performance; after the production of the novel melt-blown nonwoven fabric is completed, the novel melt-blown nonwoven fabric is rolled up by a winding device 9.

The manufacturing method of the novel melt-blown non-woven fabric comprises the following steps:

s01, pre-vacuum-drying the functional particles in a vacuum drying oven at 80 ℃ for 12 hours, adding the functional particles, a dispersing agent and a coupling agent into an ultrasonic reactor with ultrasonic frequency of 25khz, performing ultrasonic modification for 30-50 min, taking out and drying at 80 ℃ for 6-10 hours to obtain modified functional particles;

s02, drying the resin particles in a vacuum drying oven at 80 ℃ for 12 hours in vacuum in advance, adding the resin particles and the modified functional particles into a mixer with the rotating speed of 1500-2000 r/min for mixing, filling the mixture into a hopper of a double-screw extruder (1), and melting in the screw extruder (1);

s03, filtering by the filtering device (2), shunting to two melt-blowing mouth dies (4) by the shunt (3) for extrusion, providing high-pressure air with the pressure of 70-90 kpa by the air supply device (5), heating to 350-450 ℃ by the air heater, and spraying the nano Ag with the spraying device (7)⁺、Cu²⁺Mixing, namely blowing the molten material out of a spinneret orifice of a melting die (4) to a receiving device (8);

s04, adhering the novel melt-blown non-woven fabric to the surface of a receiving device (8) under the negative pressure of 100-200Mpa, performing electrostatic treatment on the novel melt-blown non-woven fabric by adopting 10 ten thousand volts by using an electrostatic treatment device (10), then performing air cooling for 10-30min, forming, and rolling up the cooled novel melt-blown non-woven fabric by using a winding device (9).