Manufacturing method for antibacterial hybrid non-woven fabrics and antibacterial hybrid non-woven fabrics and dust proof garment therefrom

Abstract

The present invention relates to a method for manufacturing a composite nonwoven fabric for manufacturing cleanroom ice suits with excellent mechanical strength, water pressure resistance, and air permeability by laminating and heat calendering a spunbond nonwoven fabric and a meltblown nonwoven fabric to form a composite, and to a composite nonwoven fabric for manufacturing cleanroom ice suits manufactured therefrom.

Description

Technology Field

[0001] The present invention relates to a method for manufacturing an antibacterial composite nonwoven fabric and to an antibacterial composite nonwoven fabric and a dustproof suit manufactured therefrom. More specifically, the invention relates to a method for manufacturing an antibacterial composite nonwoven fabric having excellent mechanical properties, such as antibacterial properties and strength, by laminating and composited a spunbond nonwoven fabric containing a zeolite antibacterial agent and a meltblown nonwoven fabric, and to an antibacterial composite nonwoven fabric and a dustproof suit manufactured therefrom. Background Technology

[0003] The present invention relates to a method for manufacturing an antimicrobial composite nonwoven fabric and to an antimicrobial composite nonwoven fabric and a dustproof suit manufactured therefrom. More specifically, the invention relates to a method for manufacturing a composite nonwoven fabric that exhibits antimicrobial properties by including a zeolite antimicrobial agent in a spunbond nonwoven fabric and a meltblown nonwoven fabric for manufacturing the antimicrobial composite nonwoven fabric, and to an antimicrobial composite nonwoven fabric and a dustproof suit manufactured therefrom. That is, the invention relates to a method for manufacturing an antimicrobial composite nonwoven fabric and an antimicrobial composite nonwoven fabric manufactured therefrom, for manufacturing a dustproof suit that allows a wearer to move comfortably within a cleanroom and has improved control capabilities against salt, moisture, fine particulate dust, etc. generated by the wearer.

[0005] In general, high-tech products require production environments characterized by ultra-precision, high integration, high purity, and sterility to improve product performance and manufacturing yield. These production environments are continuously evolving through the introduction of bio-cleanrooms to prevent biological contamination in fields such as medicine, pharmaceuticals, food, and genetic engineering, as well as industrial cleanrooms to prevent contamination by particles in industries such as semiconductors, electronics, precision machinery, and new materials.

[0007] In particular, cleanrooms used in the semiconductor industry, a high-tech industry, control particles entering the cleanroom by supplying and discharging clean air through filters to continuously remove particles generated inside.

[0009] Among the consumables used in such cleanrooms are dustproof suits worn by workers, and these cleanroom dustproof suits are intended to prevent contamination and damage to the workpiece by particles by blocking various particles generated from the worker's body from leaking to the workpiece.

[0011] Looking at the prior art regarding the above-mentioned cleanroom dustproof suit, Korean Registered Patent Publication No. 10-0663690 discloses a cleanroom nano-web film laminated dustproof fabric in which a non-woven type nano-web film and a fabric are laminated to the dustproof suit, thereby providing a good wearing comfort due to the fabric's lightness, high air permeability and moisture permeability, as well as excellent particle control capability. Additionally, Korean Published Patent Publication No. 10-2002-0029670 discloses a non-woven fabric for manufacturing a reusable cleanroom protective suit made of super-microfilaments having a filament grade of less than 0.2 dtex.

[0013] However, the nonwoven fabric used to manufacture cleanroom dustproof suits according to the prior art described above undergoes post-processing to impart antibacterial properties; however, the antibacterial properties imparted through such post-processing are not sustainable and gradually decrease over time. In other words, antibacterial particles attached to the surface of the nonwoven fabric are easily removed by external friction, making it very difficult to maintain antibacterial properties. Furthermore, cleanroom dustproof suits according to the prior art are manufactured from nonwoven fabric, resulting in weak mechanical strength and an inability to secure rigidity against physical deformation. Additionally, the nonwoven fabric used to manufacture cleanroom dustproof suits according to the prior art is excessively densified to prevent the leakage of antibacterial particles, exhibiting film-like characteristics. Consequently, it exhibits significantly low values ​​for air permeability, making it difficult to expel moisture such as sweat generated from the human body, which leads to the problem of being unable to wear the suit for extended periods. The problem to be solved

[0015] The present invention has been devised to solve the above-mentioned problems and aims to provide a method for manufacturing an antimicrobial composite nonwoven fabric that offers excellent mobility and, in particular, excellent antibacterial properties and mechanical properties, so as to provide a comfortable working environment for workers in a cleanroom, as well as an antimicrobial composite nonwoven fabric and a dustproof suit manufactured therefrom. However, the problems to be solved by the present invention are not limited to those mentioned above, and other unmentioned problems will be clearly understood by a person skilled in the art from the description below. means of solving the problem

[0017] The method for manufacturing an antibacterial composite nonwoven fabric according to the present invention comprises a zinc cation (Zn) through a cation exchange reaction with a sodium cation present in the crystal structure of a zeolite used as a carrier. 2 + A first step (S100) of introducing ) into the zeolite into which the zinc cation has been introduced, and silver cations (Ag) through a cation exchange reaction with sodium cations in the zeolite into which the zinc cation has been introduced. +A second step (S200) of introducing ); a third step (S300) of crushing and classifying a zeolite containing sodium cations, silver cations, and zinc cations by introducing zinc cations and silver cations through the first step (S100) and the second step (S200); a fourth step (S400) of heat-treating the zeolite containing sodium cations, silver cations, and zinc cations crushed and classified in the third step (S300) to produce a zeolite antimicrobial agent; a fifth step (S500) of mixing the zeolite antimicrobial agent produced in the fourth step (S400) with a thermoplastic resin to produce a masterbatch; and a sixth step (S600) of mixing and spinning the masterbatch produced in the fifth step (S500) with the thermoplastic resin to produce a first spunbond nonwoven fabric layer; Step 7 (S700) of manufacturing a first meltblown nonwoven fabric layer on top of the first spunbond nonwoven fabric layer by mixing and spinning the masterbatch manufactured in Step 5 (S500) and the thermoplastic resin; Step 8 (S800) of manufacturing a second meltblown nonwoven fabric layer on top of the first meltblown nonwoven fabric layer by mixing and spinning the masterbatch manufactured in Step 5 (S500) and the thermoplastic resin; Step 9 (S900) of manufacturing a nonwoven fabric laminate by manufacturing a second spunbond nonwoven fabric layer on top of the second meltblown nonwoven fabric layer by mixing and spinning the masterbatch manufactured in Step 5 (S500) and the thermoplastic resin. and a tenth step (S1000) of heat-pressing the nonwoven laminate manufactured in the ninth step (S900) using a calender roll; wherein the nonwoven laminate comprises: a first spunbond nonwoven layer; a first meltblown nonwoven layer provided on top of the first spunbond nonwoven layer; a second meltblown nonwoven layer provided on top of the first meltblown nonwoven layer; and a second spunbond nonwoven layer provided on top of the second meltblown nonwoven layer;It is composed of, wherein the first and second meltblown nonwoven fabric layers are preferably made of polypropylene having a melt index of 1,500 to 2,000 g / 10 min, and the first and second spunbond nonwoven fabric layers are preferably made of polypropylene having a melt index of 30 to 50 g / 10 min.

[0019] In addition, in the above 4th step (S400), the heat treatment is performed at 200 to 400 ℃ for 20 to 40 hours, and in the above 6th to 9th steps, the zeolite antimicrobial agent is contained in 1.0 to 5.0 weight% during mixed spinning, the thermoplastic resin is polypropylene, the average particle size of the zeolite antimicrobial agent is 500 to 800 nanometers, the average diameter of the constituent fibers of the first meltblown nonwoven layer and the second meltblown nonwoven layer is 1.5 to 3.0 μm, and the average diameter of the constituent fibers of the first spunbond nonwoven layer and the second spunbond nonwoven layer is 2.0 to 4.5 μm, the temperature of the calender roll in the above 10th step is 130 to 170 ℃, and the progress speed of the laminate is 2 to 10 m / min. The pressure is 50 to 200 N / mm, and the molar ratio of sodium cation : silver cation : zinc cation of the zeolite containing sodium cation, silver cation, and zinc cation prepared in the third step (S300) is 2.3 to 6.3 : 0.03 to 0.07 : 1.8 to 5.8, and the cation exchange reaction in the first step (S100) and the second step (S200) is performed at pH 6 to 9, and the zeolite used as the carrier in the first step (S100) is preferably one or more selected from A-type zeolite, X-type zeolite, and Y-type zeolite.

[0021] In addition, the antimicrobial composite nonwoven fabric according to the present invention can be used in the manufacture of cleanroom dustproof clothing, and the basis weight of the antimicrobial composite nonwoven fabric is 45 to 75 g / m² 2and, the longitudinal tear strength is 10 to 50 N, the transverse tear strength is 5 to 25 N, the water pressure resistance is 300 to 700 mmH2O, and the air permeability is 5 to 70 cm 3 / cm 2 It is / sec, and in particular, it may be desirable to have a 99.9% reduction in bacteriostatic activity. Effects of the invention

[0023] The antimicrobial composite nonwoven fabric according to the present invention has excellent mechanical properties due to heat pressing using a calender roll, and can be usefully used in the manufacture of cleanroom dustproof clothing with excellent mobility. In particular, it has excellent antimicrobial properties that can prevent the proliferation of germs or bacteria, and can maintain these antimicrobial properties continuously while preventing the release of particles. Furthermore, the antimicrobial composite nonwoven fabric according to the present invention has excellent air permeability, allowing for easy ventilation, and can prevent skin rashes and mold growth on the wearer, thereby enabling the manufacture of dustproof clothing that provides high comfort and mobility to the worker. Brief explanation of the drawing

[0025] FIG. 1 is a flowchart of a method for manufacturing an antibacterial composite nonwoven fabric according to the present invention, and FIG. 2 is a schematic diagram of a cation exchange reaction for preparing a zeolite antimicrobial agent according to the present invention, and FIG. 3 is a photograph of a zeolite antibacterial agent according to the present invention, and FIG. 4 is a cross-sectional structural diagram of an antibacterial composite nonwoven fabric according to the present invention, and FIG. 5 is a schematic diagram of a manufacturing apparatus for an antibacterial composite nonwoven fabric according to the present invention, and FIG. 6 is a photograph (a) of an antibacterial composite nonwoven fabric according to the present invention and a photograph (b) of a dustproof suit manufactured using the same. Specific details for implementing the invention

[0026] In this application, terms such as “comprising,” “having,” or “comprising” are intended to specify the existence of the features, numbers, steps, components, parts, or combinations thereof described in the specification, and should not be understood as precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which this invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application. Below, preferred embodiments of the present invention will be described in more detail with reference to the attached drawings. To facilitate overall understanding in describing the present invention, the same reference numerals are used for identical components in the drawings, and redundant descriptions of identical components are omitted.

[0028] Hereinafter, the method for manufacturing an antibacterial composite nonwoven fabric (100) according to the present invention, and the antibacterial composite nonwoven fabric (100) and dustproof suit manufactured therefrom, will be described in detail. FIG. 1 attached to the present invention is a flowchart of the method for manufacturing an antibacterial composite nonwoven fabric (100) according to the present invention, FIG. 2 is a schematic diagram of a cation exchange reaction for manufacturing a zeolite antibacterial agent according to the present invention, FIG. 3 is a photograph of a zeolite antibacterial agent according to the present invention, FIG. 4 is a cross-sectional structural diagram of an antibacterial composite nonwoven fabric according to the present invention, FIG. 5 is a schematic diagram of a manufacturing apparatus for an antibacterial composite nonwoven fabric according to the present invention, and FIG. 6 is a photograph (a) of an antibacterial composite nonwoven fabric according to the present invention and a photograph (b) of a dustproof suit manufactured using the same.

[0030] Below, we will first examine a method for manufacturing an antibacterial composite nonwoven fabric (100) according to the present invention. As shown in FIG. 1, the method for manufacturing an antibacterial composite nonwoven fabric (100) according to the present invention involves a zinc cation (Zn) through a cation exchange reaction with a sodium cation present in the crystal structure of a zeolite used as a carrier. 2 + A first step (S100) of introducing ) into the zeolite into which the zinc cation has been introduced, and silver cations (Ag) through a cation exchange reaction with sodium cations in the zeolite into which the zinc cation has been introduced. +A second step (S200) of introducing ); a third step (S300) of crushing and classifying a zeolite containing sodium cations, silver cations, and zinc cations by introducing zinc cations and silver cations through the first step (S100) and the second step (S200); a fourth step (S400) of heat-treating the zeolite containing sodium cations, silver cations, and zinc cations crushed and classified in the third step (S300) to produce a zeolite antimicrobial agent; a fifth step (S500) of mixing the zeolite antimicrobial agent produced in the fourth step (S400) with a thermoplastic resin to produce a masterbatch; and a sixth step (S600) of mixing and spinning the masterbatch produced in the fifth step (S500) with the thermoplastic resin to produce a first spunbond nonwoven fabric layer (10); A seventh step (S700) of manufacturing a first meltblown nonwoven fabric layer (30) on top of the first spunbond nonwoven fabric layer (10) by mixing and spinning the masterbatch manufactured in the fifth step (S500) and the thermoplastic resin; an eighth step (S800) of manufacturing a second meltblown nonwoven fabric layer (40) on top of the first meltblown nonwoven fabric layer (30) by mixing and spinning the masterbatch manufactured in the fifth step (S500) and the thermoplastic resin; and a ninth step (S900) of manufacturing a nonwoven fabric laminate by manufacturing a second spunbond nonwoven fabric layer (20) on top of the second meltblown nonwoven fabric layer (40) by mixing and spinning the masterbatch manufactured in the fifth step (S500) and the thermoplastic resin. It is preferable to include a 10th step (S1000) of heat-pressing the nonwoven laminate manufactured in the 9th step (S900) using a calender roll.

[0032] According to the present invention, the zeolite antimicrobial agent for manufacturing the antimicrobial composite nonwoven fabric (100) can be manufactured through a cation exchange reaction, and it is preferable to include a zeolite as a carrier, a sodium cation introduced into the crystal structure of the zeolite, and a silver cation and a zinc cation introduced through a cation exchange reaction with the sodium cation.

[0033] Typically, the above zeolite is a crystalline aluminosilicate in which tetrahedra of AlO4 and SiO4 are bonded to form sodalite units (β-cages) having eight hexagonal faces and six tetragonal faces. In addition, the zeolite is Na 12 {SiO2AlO2} 12 It has the structure of xH2O.

[0034] The above zeolites come in many varieties and possess adsorption separation and ion exchange capabilities, so they are widely used as catalysts, adsorbents, ion exchange resins, catalyst supports, etc.

[0036] The zeolite for producing the zeolite antimicrobial agent according to the present invention may be any one selected from the group consisting of A-type zeolite, X-type zeolite, Y-type zeolite, P-type zeolite, high-silica zeolite, mordenite, clinoptilolite, cavitrite, and eninoite, but A-type zeolite, X-type zeolite, and Y-type zeolite are particularly preferred.

[0037] The structural formulas and Si / Al ratios of the above-mentioned A-type zeolite, X-type zeolite, and Y-type zeolite are as shown in Table 1 below.

[0039] constitutional formula Si / Al ratio Type A zeolite Na 12 (AlO2) 12 (SiO2) 12 27H2O 1 X-type zeolite Na 86 (AlO2) 86 (SiO2) 106 264H2O 1.2 Y-type zeolite Na 56 (AlO2) 56 (SiO2) 136 53H2O 2.4

[0041] Since the above zeolite forms a negative charge due to aluminum atoms within its structure, cations such as sodium are present to adjust this charge imbalance and neutralize the total charge.

[0043] The zeolite antimicrobial agent according to the present invention comprises sodium cations (Na₂C₆) existing as cations in the skeletal structure of the zeolite used as a carrier, as shown in FIG. 2. + A portion of ) is converted into silver cations (Ag) through a cation exchange reaction + ) and zinc cations (Zn 2 + It can be manufactured by replacing with ).

[0045] That is, the zeolite antimicrobial agent according to the present invention comprises sodium cations, silver cations, and zinc cations, and said sodium cations, silver cations, and zinc cations exist within the zeolite in an ionic bonded state. The zeolite antimicrobial agent leaches silver cations and zinc cations as antimicrobial substances in water, and the silver cations and zinc cations leached into water as described above bind to atomic groups such as thiol groups, amino groups, imidazole groups, and carboxylate groups present in bacteria or microorganisms. It is reported that the binding of silver or zinc cations to these atomic groups disrupts the respiration or electron transfer processes of bacteria or microorganisms, thereby causing the death of bacteria or microorganisms due to respiratory and metabolic disorders. Furthermore, oxygen bound to the zeolite antimicrobial agent or dissolved oxygen in the water is partially oxygenated by the catalytic action of the zeolite antimicrobial agent itself. 2+ , O 2- Alternatively, it is converted into reactive oxygen species such as O. These reactive oxygen species are reported to exert powerful sterilizing effects, such as ozone or hydrogen peroxide.

[0047] In the method for manufacturing an antibacterial composite nonwoven fabric (100) according to the present invention, the first step (S100) is to generate zinc cations (Zn) through a cation exchange reaction with sodium cations present in the crystal structure of the zeolite used as the carrier. 2+ This refers to the step of manufacturing a zeolite into which ) is introduced. In this case, according to the present invention, it is particularly preferable to use any one of the zeolites selected from the group including A-type zeolite, X-type zeolite, and Y-type zeolite.

[0048] As described above, in order to introduce zinc cations into the zeolite structure through a cation exchange reaction with sodium cations present in the zeolite crystal structure, water is introduced into a first reaction vessel equipped with a stirrer and capable of temperature control, and the zeolite is introduced while stirring. At this time, nitric acid is introduced while maintaining the temperature of the first reaction vessel at 30 to 80 ℃ to adjust the pH to 6 to 9.

[0049] In addition, water is introduced into the second reaction vessel, and zinc sulfate is introduced while stirring. It is preferable that the second reaction vessel is also equipped with a stirrer and capable of temperature control. At this time, zinc sulfate is dissolved in the introduced water while maintaining the temperature of the second reaction vessel at 30 to 80°C. The water in which zinc sulfate has been dissolved in the second reaction vessel as described above is slowly introduced into the first reaction vessel.

[0050] As described above, when water in which zinc sulfate is dissolved is introduced into the first reaction vessel and the temperature is maintained at 30 to 80°C while stirring, the sodium cations and zinc cations present in the zeolite are exchanged with each other. At this time, the cation exchange reaction time for exchanging zinc cations and sodium cations to introduce the zinc cations into the structure of the zeolite is preferably 10 to 12 hours.

[0051] After the cation exchange reaction for introducing zinc cations as described above is completed, the zeolite into which the zinc cations have been introduced is produced.

[0053] Afterward, various impurities present in the first and second reaction vessels are removed using distilled water. After removing impurities from the first and second reaction vessels as described above, silver cations are introduced into the zeolite structure into which zinc cations were introduced through the first step (S100) as a second step (S200). In order to introduce silver cations as described above, water is added to the first reaction vessel and the zeolite into which zinc cations were introduced, prepared through the first step (S100), is added while stirring. At this time, nitric acid is added while maintaining the temperature of the first reaction vessel at 30 to 80°C to adjust the pH to 6 to 9.

[0055] In addition, distilled water is added to the second reaction vessel and silver nitrate is added and dissolved while stirring. At this time, the silver nitrate is dissolved while maintaining the temperature of the second reaction vessel at 30 to 80°C. The water in which the silver nitrate is dissolved in the second reaction vessel as described above is slowly added to the first reaction vessel into which the zeolite into which the zinc cation was introduced is added.

[0056] As described above, after introducing water in which silver nitrate is dissolved into the first reaction vessel, if the temperature is maintained at 30 to 80°C while stirring, the sodium cations and silver cations remaining in the zeolite into which the zinc cations have been introduced are exchanged with each other. At this time, the cation exchange reaction time for exchanging silver cations and sodium cations to introduce the silver cations into the structure of the zeolite is preferably 4 to 6 hours.

[0058] As described above, when the exchange reaction of silver cations is completed as the second step (S200), the introduced silver cations and zinc cations are present in the zeolite, and some unreacted sodium cations remain.

[0059] After the second step (S200) is completed as described above, the zeolite into which zinc cations and silver cations have been introduced is collected and dehydrated and dried.

[0061] According to the present invention, when the pH of the first reaction vessel is adjusted to 6 to 9 in the first step (S100) and the second step (S200), H in the aqueous solution + Ions and OH - Ions can be formed more easily than in water, and by acting as catalysts for cation exchange, they increase the reaction rate. Accordingly, the cation exchange reaction can proceed smoothly in the first step (S100) and the second step (S200).

[0062] As described above, during the zinc cation exchange reaction in the first step (S100) and the silver cation exchange reaction in the second step (S200), the molar ratio of sodium cations, silver cations, and zinc cations can be controlled to 2.3–6.3 : 0.03–0.07 : 1.8–5.8 through reaction conditions such as the temperature, pH, and reaction time of the reaction vessel.

[0064] That is, for the zeolite prepared by exchanging silver cations and zinc cations with sodium cations as described above, it is preferable that the molar ratio of sodium cation : silver cation : zinc cation is 2.3 to 6.3 : 0.03 to 0.07 : 1.8 to 5.8 as the composition ratio of cations provided within the structure of the zeolite.

[0065] By configuring the molar ratio of cations as described above, the molecular structural formula of the zeolite antibacterial agent according to the present invention is Na2 .3~6.3 Ag0 .03∼0.07 Zn1 .8∼5.8 {SiO2·AlO2} 12· It is equal to xH2O. By configuring the molar ratio of cations as described above, it is possible to manufacture a zeolite antibacterial agent with the best antibacterial effect.

[0066] In addition, the antibacterial activity of the zeolite antibacterial agent can be maximized when the molar ratio of the sodium cation : silver cation : zinc cation is 2.3 to 6.3 : 0.03 to 0.07 : 1.8 to 5.8. Also, if the ratio falls outside the above range, the antibacterial activity may decrease, and there may be problems such as the cation exchange reaction not proceeding smoothly or the waste of expensive silver cations.

[0068] Afterwards, a third step (S300) of crushing and classifying the dried zeolite antibacterial agent as described above is performed. The third step (S300) refers to a step of crushing and classifying the zeolite antibacterial agent to control the particle size of the zeolite antibacterial agent.

[0070] When moisture is present, the above-mentioned zeolite antimicrobial agent clumps together due to mutual attraction and has an average particle size of 1 μm or more. As described above, when the average particle size is 1 μm or more, the particle size is large, resulting in poor dispersibility and making it unsuitable for melt spinning by mixing with a thermoplastic resin.

[0071] The coarsening or aggregation of such zeolites inevitably reduces excellent effects such as antibacterial properties, lowers the physical properties of the antibacterial composite nonwoven fabric (100) being manufactured, that is, the performance of the polymer, and particularly makes it impossible to manufacture it in the form of fibers or films.

[0073] Therefore, in order to use the zeolite prepared as described above as a zeolite antibacterial agent in the present invention, as a third step (S300), it undergoes a grinding and classification process to have an average particle size of 500 to 800 nm.

[0075] According to the present invention, in the third step (S300), the grinding process can be performed using any one of a grinder selected from an air jet mill, a ball mill, a rod mill, and an attrition mill, and the classification can be performed using any one of a classifier selected from an air classifier and a wet cyclone.

[0076] That is, the zeolite antimicrobial agent produced through the first step (S100) and the second step (S200) can be used by grinding and classifying as needed, and the average particle size of the zeolite antimicrobial agent is 500 to 800 nm, which is superior in terms of usability.

[0078] The grinding process for grinding the zeolite antimicrobial agent aggregated after dehydration according to the present invention is particularly preferably performed by an air jet mill and can be carried out by mutual collision and friction of the aggregated zeolite antimicrobial agents.

[0079] The above air jet mill achieves pulverization by injecting high-pressure compressed air from a nozzle into aggregated zeolite antimicrobial agents supplied to a grinding chamber, through mutual collisions and friction between the zeolite antimicrobial agents.

[0080] At this time, zeolite antimicrobial agents ground to a size smaller than a certain threshold are discharged to the outside through the classification chamber, while those larger than a certain threshold are fed back into the grinding chamber for re-grinding. Accordingly, the aggregated zeolite can be continuously ground.

[0082] The zeolite crushed as described above is classified to obtain only the zeolite antimicrobial agent having an average particle size of 500 to 800 nanometers. According to the present invention, it is preferable to use an air classifier for the classification process. The zeolite having the above-mentioned size range is obtained, and the remaining zeolite is recirculated to the crushing process.

[0084] As described above, the zeolite that has been crushed and classified through the third step (S300) then undergoes a fourth step (S400) of heat treatment.

[0085] As an embodiment, the above fourth step (S400) is preferably performed on the zeolite crushed and classified in the above third step (S300) at 200 to 400°C for 20 to 40 hours.

[0086] Typically, ground and classified zeolites do not aggregate when dried, but they aggregate in the presence of moisture, causing an increase in average particle size. Therefore, aggregation is prevented by removing the moisture present in the zeolite through the heat treatment described above.

[0088] As described above, by heat treatment through the fourth step (S400), the manufacture of the zeolite antibacterial agent according to the present invention can be completed as shown in FIG. 3.

[0090] Subsequently, as a fifth step (S500), a masterbatch is prepared by mixing the zeolite antibacterial agent prepared in the fourth step (S400) with a thermoplastic resin. In the fifth step (S500), the zeolite antibacterial agent prepared in the fourth step (S400) can be fed into an extruder together with the thermoplastic resin to be mixed and extruded to produce a masterbatch. At this time, the extrusion conditions may be changed depending on the type of thermoplastic resin, and since this can be adjusted by a person skilled in the art according to the type of thermoplastic resin, it is not limited; however, it is preferable to prepare the masterbatch while heating to the melting temperature of the thermoplastic resin. The thermoplastic resin is not particularly limited, but specifically, for example, polypropylene may be used. It may be preferable for the masterbatch to be prepared in the form of chips.

[0092] After manufacturing the masterbatch in the above 5th step (S500), the composite nonwoven fabric is manufactured using an antibacterial composite nonwoven fabric manufacturing device (200) as shown in FIG. 5 in the 6th step (S600) to the 9th step (S900). That is, in the method for manufacturing the antibacterial composite nonwoven fabric (100) according to the present invention, the 6th step (S600) refers to the step of manufacturing the first spunbond nonwoven fabric layer (10).

[0093] The first spunbond nonwoven fabric layer (10) can be manufactured by melt spinning a mixture of the masterbatch produced in the fifth step and a thermoplastic resin, namely polypropylene, so that the melt index is 30 to 50 g / 10 min. The production of the first spunbond nonwoven fabric layer (10) is achieved by mixing and spinning the masterbatch and polypropylene as described above to form a web on a moving conveyor belt (260) and bonding it by thermal or mechanical means to form the first spunbond nonwoven fabric layer (10).

[0094] According to the present invention, the first spunbond nonwoven fabric layer (10) may be manufactured by melt spinning a mixture of a masterbatch produced in the fifth step and polypropylene, with a melt index of 30 to 50 g / 10 min, and the diameter of the fibers constituting the first spunbond nonwoven fabric layer (10) may preferably be 2.0 to 4.5 μm.

[0096] After manufacturing the first spunbond nonwoven fabric layer (10) through the 6th step (S600) as described above, the 7th step involves forming a first meltblown nonwoven fabric layer (30) on top of the first spunbond nonwoven fabric layer (10). According to the present invention, the first meltblown nonwoven fabric layer (30) can be manufactured by melt spinning a thermoplastic resin, namely polypropylene, mixed with the masterbatch manufactured in the 5th step, such that the melt index is 1,500 to 2,000 g / 10 min. At this time, it may be preferable that the diameter of the fibers constituting the first meltblown nonwoven fabric layer (30) be 1.5 to 3.0 μm.

[0098] After manufacturing the first meltblown nonwoven fabric layer (30) on top of the first spunbond nonwoven fabric layer (10) through the above 7th step (S700), the 8th step (S800) is performed to form the second meltblown nonwoven fabric layer (40) on top of the first meltblown nonwoven fabric layer (30). At this time, the second meltblown nonwoven fabric layer (40) is manufactured by melt spinning a thermoplastic resin, namely polypropylene, mixed with the masterbatch manufactured in the above 5th step in the same way as the first meltblown nonwoven fabric layer (30), so that the melt index is 1,500 to 2,000 g / 10 min, and can be manufactured with the same fiber diameter.

[0100] After manufacturing a second meltblown nonwoven fabric layer (40) on top of the first meltblown nonwoven fabric layer (30) through the above eighth step (S800), a ninth step (S900) is performed to form a second spunbond nonwoven fabric layer (20) on top of the second meltblown nonwoven fabric layer (40). The second spunbond nonwoven fabric layer (20) manufactured through the above ninth step (S900) can be manufactured in the same way as the first spunbond nonwoven fabric layer (10) manufactured in the sixth step (S100).

[0102] The first and second spunbond nonwoven fabric layers (10, 20) and the first and second meltblown nonwoven fabric layers (30, 40) formed through the above 6th step (S600) to 9th step (S900) can be formed by mixing and spinning a masterbatch and a thermoplastic resin, i.e., polypropylene, through a spunbond spinning unit and a meltblown spinning unit, respectively, and discharging them onto the upper part of the conveyor belt (260), as shown in FIG. 5. That is, as shown in FIG. 5, the first spunbond nonwoven fabric layer (10) and the first spunbond nonwoven fabric layer (20) can be formed by melting the masterbatch and the thermoplastic resin through the first spunbond spinning unit (210) and the second spunbond spinning unit (220), respectively, and discharging them onto the upper part of the conveyor belt (260). In addition, the first meltblown nonwoven fabric layer (30) and the second meltblown nonwoven fabric layer (40) can be formed by melting the masterbatch and the thermoplastic resin by the first meltblown spinning unit (230) and the second meltblown spinning unit (240), respectively, and discharging them onto the upper part of the conveyor belt (260).

[0103] In addition, when manufacturing the first and second spunbond nonwoven layers (10, 20) and the first and second meltblown nonwoven layers (30, 40) by mixing and spinning in steps 6 (S600) to 9 (S900), it may be most desirable to contain 1.0 to 5.0 weight% of a zeolite antimicrobial agent in terms of exhibiting antimicrobial properties.

[0104] At this time, it may be preferable that the distance between the first spunbond spinning section (210) and the second spunbond spinning section (220) forming the spunbond nonwoven fabric layer, the first meltblown spinning section (230) and the second meltblown spinning section (240) forming the meltblown nonwoven fabric layer, and the conveyor belt (260) be 300 to 750 mm. That is, if the distance between the first and second spunbond spinning sections (210, 220) and the first and second meltblown spinning sections (230, 240) and the conveyor belt (260) is less than 300 mm, the pressure of the molten polypropylene resin being extruded is excessive, so the fiber density of the nonwoven fabric layer formed becomes too dense, and a decrease in bulkiness and air permeability is expected, and if it exceeds 750 mm, there is a possibility that the nonwoven fabric forming ability will decrease.

[0106] With reference to FIG. 5, the 6th step (S600) to the 9th step (S900) according to the present invention is described. The antibacterial composite nonwoven fabric manufacturing device (200) according to the present invention comprises a conveyor belt (260) that rotates by a driving roller (250), and a first spunbond spinning section (210), a first meltblown spinning section (230), a second meltblown spinning section (240), and a second spunbond spinning section (220) provided on the upper part of the conveyor belt (260). A pair of calender rolls, consisting of an upper calender roll (270) and a lower calender roll (275), are provided at the rear of the conveyor belt (260).

[0108] That is, the first spunbond filament (215) melt-spun from the first spunbond spinning unit (210) is stacked on the conveyor belt (260) to form the first spunbond nonwoven fabric layer (10) and moves along the conveyor belt (260). At this time, the conveyor belt (260) is rotated by drive rollers (250) provided on both sides as shown in FIG. 5 to transport the first spunbond nonwoven fabric layer (10).

[0109] As described above, a first meltblown filament (235) melt-spun by a first meltblown spinning unit (230) is laminated on the upper part of the first spunbond nonwoven fabric layer (10) transported along the conveyor belt (260) to form a first meltblown nonwoven fabric layer (30) as shown in FIG. 5.

[0111] As described above, the first meltblown nonwoven fabric layer (30) laminated on top of the first spunbond nonwoven fabric layer (10) moves together on the conveyor belt (260), and subsequently, the second meltblown filament (245) is melt-spun from the second meltblown spinning unit (240) to form the second meltblown nonwoven fabric layer (40).

[0112] After forming the second meltblown nonwoven fabric layer (40) as described above, the fabric is moved along the conveyor belt (260) to the second spunbond spinning section (220), and then the second spunbond filament (225) is melt-spun at the second spunbond spinning section (220) to form the second spunbond nonwoven fabric layer (20), thereby manufacturing a nonwoven fabric laminate.

[0114] As described above, the nonwoven laminate (280) comprising the first and second spunbond nonwoven layers (10, 20) and the first and second meltblown nonwoven layers (30, 40) manufactured through steps 6 (S600) to 9 (S900) may preferably be composed of: a first spunbond nonwoven layer (10); a first meltblown nonwoven layer (30) provided on top of the first spunbond nonwoven layer (10); a second meltblown nonwoven layer (40) provided on top of the first meltblown nonwoven layer (30); and a second spunbond nonwoven layer (20) provided on top of the second meltblown nonwoven layer (40), as shown in FIG. 4.

[0116] Afterwards, as the 10th step (S1000), the nonwoven laminate (280) manufactured in the 9th step (S900) is subjected to heat pressing using a calender roll. In the 10th step (S1000), the nonwoven laminate (280) is transferred to a pair of upper calender rolls (270) and lower calender rolls (275) maintained at 130 to 170°C, and then the laminate (280) is subjected to heat pressing using the upper calender rolls (270) and lower calender rolls (275) to form a thermally bonded antibacterial composite nonwoven fabric (100).

[0117] In the above 10th step, the temperature of the upper calender roll (270) and the lower calender roll (275) may be 130 to 170 ℃, the speed of the nonwoven laminate (280) may be 2 to 10 m / min, and the pressure of the upper calender roll (270) and the lower calender roll (275) may preferably be 50 to 200 N / mm.

[0119] The heat pressing of the nonwoven laminate performed in the above 10th step (S1000) can be performed to impart mechanical strength, water pressure resistance, and air permeability to the antibacterial composite nonwoven fabric (100).

[0120] That is, the above nonwoven fabric laminate (280) is inserted between the upper calender roll (270) and the lower calender roll (275) and heat-pressurized. At this time, the temperature of the upper calender roll (270) and the lower calender roll (275) may be 130 to 170 ℃, and the pressure may preferably be 50 to 200 N / mm. If the temperature of the upper calender roll (270) and the lower calender roll (275) is less than 130 ℃ or the pressure is less than 50 N / mm, the adhesion between the first and second spunbond nonwoven fabric layers (10, 20) and the first and second meltblown nonwoven fabric layers (30, 40) constituting the above laminate (280) may be poor. Conversely, if the temperature of the upper calender roll (270) and the lower calender roll (275) exceeds 170 ℃ or the pressure exceeds 200 N / mm, the first and second spunbond nonwoven layers (10, 20) and the first and second meltblown nonwoven layers (30, 40) constituting the laminate (280) melt and bond, resulting in poor air permeability.

[0121] Accordingly, in step 10 (S1000), the temperature of the upper calender roll (270) and the lower calender roll (275) may be 130 to 170 ℃, and the pressure may be 50 to 200 N / mm.

[0122] In addition, the progress speed of the nonwoven laminate (280) in the above 10th step (S1000) is 2 to 10 m / min, and if it is less than 2 m / min, productivity is reduced, and if it exceeds 10 m / min, the adhesion of the nonwoven laminate (280) may be poor.

[0124] The above nonwoven laminate (280) is thermally bonded by passing through the upper calender roll (270) and the lower calender roll (275) through the 10th step (S1000) to produce an antibacterial composite nonwoven fabric (100) according to the present invention as shown in FIG. 6 (a).

[0126] The present invention will be examined in more detail below through examples. However, the present invention is not limited to the following examples.

[0128] <Example 1>

[0130] As a first step (S100), water was introduced into a first reaction vessel and a type A zeolite was introduced while stirring, and nitric acid was introduced while maintaining the temperature of the first reaction vessel at 45°C to adjust the pH to 6. Additionally, zinc sulfate was introduced into a second reaction vessel while stirring, and zinc sulfate was dissolved in the introduced water while maintaining the temperature at 45°C, after which the water in which zinc sulfate was dissolved in the second reaction vessel was slowly introduced into the first reaction vessel. Sodium cations and zinc cations present in the zeolite were exchanged for 12 hours while maintaining the temperature of the first reaction vessel at 50°C.

[0132] Subsequently, as a second step (S200), water was introduced into the first reaction vessel and, while stirring, the zeolite into which zinc cations were introduced in the first step (S100) was introduced. At this time, nitric acid was added while maintaining the temperature of the first reaction vessel at 45°C to adjust the pH to 6. Additionally, distilled water was introduced into the second reaction vessel and, while stirring, silver nitrate was added and dissolved, and then the silver nitrate was dissolved while maintaining the temperature of the second reaction vessel at 45°C. As described above, the water in which silver nitrate was dissolved in the second reaction vessel was slowly introduced into the first reaction vessel into which the zeolite into which zinc cations were introduced, and the temperature of the first reaction vessel was maintained at 45°C for 5 hours so that the sodium cations and silver cations remaining in the zeolite into which zinc cations were introduced exchanged with each other, thereby introducing the silver cations into the structure of the zeolite to produce a zeolite antibacterial agent.

[0133] The above zeolite antimicrobial agent was dehydrated and dried to produce a zeolite antimicrobial agent having a molar ratio of sodium cation, silver cation, and zinc cation of 3.5:0.05:4.5. Subsequently, as a third step (S300), the zeolite antimicrobial agent was crushed and classified, and as a fourth step, heat-treated at 350°C for 30 hours to produce a zeolite antimicrobial agent having an average particle size of 800 nm.

[0135] After performing Step 4 by heat-treating the zeolite antimicrobial agent prepared as described above at 400°C for 20 hours, a masterbatch was prepared by mixing the zeolite antimicrobial agent prepared as described above with polypropylene resin as Step 5 (S500). Then, the masterbatch prepared as described above was mixed with polypropylene and melt-spun using a composite nonwoven fabric manufacturing device (200) as shown in FIG. 5 to produce a first spunbond nonwoven fabric layer (10) containing 1.0 wt% of the zeolite antimicrobial agent (Step 6). At this time, the melt index of the mixture of the masterbatch and polypropylene is 35 g / 10 min, and the average diameter of the constituent fibers of the first spunbond nonwoven fabric layer (10) is 2.0 μm.

[0137] Subsequently, as a seventh step, the masterbatch prepared in the fifth step (S500) and polypropylene were mixed and spun to produce a first meltblown nonwoven layer (30) on top of the first spunbond nonwoven layer (10), wherein the masterbatch prepared in the fifth step (S500) and polypropylene were mixed and spun, and the first meltblown nonwoven layer (30) contained 1.0 weight% of a zeolite antimicrobial agent and the average diameter of the constituent fibers was 1.5 μm. At this time, the melt index of the mixture of the masterbatch and polypropylene is 1,500 g / 10 min.

[0139] In the eighth step, a second meltblown nonwoven fabric layer (40) is manufactured under the same conditions as in the seventh step, wherein the second meltblown nonwoven fabric layer (40) is formed on top of the first meltblown nonwoven fabric layer (30). In addition, in the ninth step, a second spunbond nonwoven fabric layer (20) is manufactured on top of the second meltblown nonwoven fabric layer (40), wherein the second spunbond nonwoven fabric layer (20) is manufactured under the same conditions as the first spunbond nonwoven fabric layer (10) to manufacture a nonwoven fabric laminate.

[0140] Subsequently, in the 10th step, the nonwoven laminate was heat-pressed with a pressure of 200 N / mm using a calender roll maintained at 150 ℃, and at this time, the nonwoven laminate was moved at a speed of 10 m / min to produce a test specimen of the antibacterial composite nonwoven fabric (100) according to <Example 1>.

[0142] <Example 2>

[0144] <Example 2> is prepared by manufacturing a test specimen in the same manner as <Example 1>, but by manufacturing first and second spunbond nonwoven layers (10, 20) and first and second meltblown nonwoven layers (30, 40) containing 3.0 wt% of the zeolite antimicrobial agent, thereby preparing a test specimen of the antimicrobial composite nonwoven fabric (100) according to <Example 2>. At this time, the average diameter of the fibers constituting the first and second spunbond nonwoven layers (10, 20) is 3.0 μm, and the average diameter of the fibers constituting the first and second meltblown nonwoven layers (30, 40) is 2.0 μm.

[0146] <Example 3>

[0148] <Example 3> is prepared by manufacturing a test specimen in the same manner as <Example 1>, but by manufacturing first and second spunbond nonwoven layers (10, 20) and first and second meltblown nonwoven layers (30, 40) containing 5.0 wt% of the zeolite antimicrobial agent, thereby preparing a test specimen of the antimicrobial composite nonwoven fabric (100) according to <Example 3>. At this time, the average diameter of the fibers constituting the first and second spunbond nonwoven layers (10, 20) is 4.5 μm, and the average diameter of the fibers constituting the first and second meltblown nonwoven layers (30, 40) is 3.0 μm.

[0151] <Comparative Example 1>

[0153] <Comparative Example 1> was prepared by manufacturing a test specimen in the same manner as <Example 1>, but by manufacturing a first and second spunbond nonwoven fabric layer (10, 20) and a first and second meltblown nonwoven fabric layer (30, 40) containing 0.5 weight% of the zeolite antimicrobial agent, thereby preparing a test specimen of the antimicrobial composite nonwoven fabric (100) according to <Comparative Example 1>.

[0155] <Comparative Example 2>

[0157] <Comparative Example 2> was prepared in the same manner as <Example 1>, but by preparing first and second spunbond nonwoven layers (10, 20) and first and second meltblown nonwoven layers (30, 40) containing 7 weight% of the zeolite antimicrobial agent, a test specimen of the antimicrobial composite nonwoven fabric (100) according to <Comparative Example 2> was prepared.

[0159] In addition, the physical properties of the test specimens of Examples 1-3 and Comparative Examples 1-2, namely basis weight, tear strength, air permeability, water pressure resistance, and antibacterial properties, were evaluated in the following manner, and the results are shown in Table 2.

[0161] 1) Basis of Weight

[0163] Ten test specimens were taken from the test specimens of Examples 1-3 and Comparative Examples 1-2 by cutting them into widths of 100 mm × lengths of 100 mm, the basis weight was measured, and the average value was calculated.

[0165] 2) Tear strength

[0167] The tear strength of the test specimens of Examples 1-3 and Comparative Examples 1-2 was measured in the machine direction (MD) and transverse direction (TD), and the measurement method was based on ASTM D 5733 (Standard Test Method for Tearing Strength of Nonwoven Fabrics by the Trapezoid Procedure).

[0169] 3) Air permeability

[0171] The air permeability of the test specimens of Examples 1-3 and Comparative Examples 1-2 above was measured at a pressure difference of 125 Pa in accordance with JIS L 1096 (Method for testing the texture of woven and knitted materials).

[0173] 4) Internal water pressure

[0175] The test specimens of Examples 1-3 and Comparative Examples 1-2 were cut to a size of 150 mm in width and 150 mm in length, and water pressure was applied for a certain period of time and at a certain pressure using a water pressure device (FX3000) to measure the water pressure at the point when water droplets began to penetrate the nonwoven fabric as the water pressure.

[0177] 5) Antibacterial properties

[0179] The antibacterial properties of the test specimens in Examples 1-3 and Comparative Examples 1-2 were tested in accordance with KS K 0693 (Test method for antibacterial properties of textile materials), and the bacteriostatic reduction rate (%) was evaluated by the following formula (1). The strain used was Staphylococcus aureus ATCC 6538, which is a major causative agent of food poisoning.

[0181]

[0183] Here, M b : Indicates the number of viable cells after 18 hours of incubation of the control specimen, M c : Indicates the number of viable cells after 18 hours of incubation of the test specimen.

[0185] Basis weight (g / m²) 2 ) Tear strength (N) Air permeability (cm²) 3 / cm 2 / sec) Internal water pressure (mmH2O) Average reduction rate (%) Machine direction width direction Example 1 45 10 5 5 300 99.9 Example 2 55 30 12 42 520 99.9 Example 3 75 50 25 70 700 99.9 Comparative Example 1 47 10 4 6 295 83.6 Comparative Example 2 48 12 6 6 302 99.9

[0187] Referring to Table 2 above, the basis weight of the test specimens of Examples 1 to 3 according to the present invention is 45 to 75 g / m² 2 It indicates, and furthermore, it can be seen that the tear strength measured according to ASTM D 5733 is 10 to 50 N in the machine direction and 5 to 25 N in the width direction. In addition, the air permeability measured according to JIS L 1096 is 5 to 70 cm 3 / cm 2 It can be confirmed that it indicates / sec and the water pressure is 300 to 700 mmH2O. In addition, it can be seen that the water pressure of the test specimens of Examples 1 to 3 according to the present invention is 300 to 700 mmH2O.

[0188] It can be seen that the basis weight, tear strength, air permeability, and water pressure resistance of the test specimens of Comparative Examples 1 and 2 show measurement results similar to those of the test specimen of Example 1.

[0189] In particular, in the case of the test specimens of Examples 1 to 3, the antibacterial activity, i.e., the bacteriostatic reduction rate, is 99.9%, while in the case of the test specimen of Comparative Example 1 containing 0.5% by weight of a zeolite antibacterial agent, the bacteriostatic reduction rate (%) is 83.6%. In addition, in the case of the test specimen of Comparative Example 2 containing 7% by weight of a zeolite antibacterial agent, the bacteriostatic reduction rate (%) is 99.9%, which is the same as that of the test specimens of Examples 1 to 3.

[0191] That is, the antibacterial composite nonwoven fabric (100) according to the present invention has excellent mechanical strength through calendering, which can improve the mechanical strength of the cleanroom dustproof suit being manufactured. In addition, since it has excellent water pressure resistance and air permeability, air can freely enter and exit, allowing for ventilation, while water, liquids, or contaminants do not seep inside, thus preventing contamination caused by the penetration of bacteria. In particular, it can be seen that when containing 1.0 to 5.0 weight% of a zeolite antibacterial agent, the bacteriostatic reduction rate is 99.9%, indicating excellent antibacterial properties. In addition, in the case of the test specimen of Comparative Example 1 containing 0.5 weight% of a zeolite antibacterial agent, the bacteriostatic reduction rate is 83.6%, indicating that the zeolite antibacterial agent must be included in an amount of 1.0 weight% or more. In addition, since the test specimen of Comparative Example 2 containing 7.0 weight% of a zeolite antibacterial agent has a bacteriostatic reduction rate of 99.9%, it can be seen that the zeolite antibacterial agent exhibits sufficient antibacterial activity when included in an amount of 1.0 to 5.0 weight%.

[0193] The antibacterial composite nonwoven fabric (100) according to the present invention exhibits excellent antibacterial properties without an additional coating process, and has excellent mechanical strength, air permeability, and water pressure resistance, so it has the effect of enabling the manufacture of a cleanroom dustproof suit such as Fig. 6 (b), which can provide a high level of comfort and mobility to the worker.

[0195] The present invention has been described with reference to the experimental examples illustrated in the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative experimental examples are possible therefrom. Furthermore, those skilled in the art will understand that the present invention can be easily modified into other specific forms without altering the technical spirit or essential features of the invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive, and the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims. Explanation of the symbols

[0197] 10: 1st spunbond nonwoven layer 20: 2nd spunbond nonwoven layer 30: 1st meltblown nonwoven layer 40: 2nd meltblown nonwoven layer 100: Antibacterial composite nonwoven fabric 200 : Antimicrobial composite nonwoven fabric manufacturing device

Claims

Claim 1 A method for manufacturing an antimicrobial composite nonwoven fabric, wherein zinc cations (Zn) are ionized through a cation exchange reaction with sodium cations present within the crystal structure of a zeolite used as a carrier. 2 + A first step (S100) of introducing ) into the zeolite into which the zinc cation has been introduced, and silver cations (Ag) through a cation exchange reaction with sodium cations in the zeolite into which the zinc cation has been introduced. + A second step (S200) of introducing ); a third step (S300) of crushing and classifying a zeolite containing sodium cations, silver cations, and zinc cations by introducing zinc cations and silver cations through the first step (S100) and the second step (S200); a fourth step (S400) of heat-treating the zeolite containing sodium cations, silver cations, and zinc cations crushed and classified in the third step (S300) to produce a zeolite antibacterial agent; and a fifth step (S500) of mixing the zeolite antibacterial agent produced in the fourth step (S400) with a thermoplastic resin to produce a masterbatch; Step 6 (S600) of manufacturing a first spunbond nonwoven fabric layer by mixing and spinning the masterbatch manufactured in Step 5 (S500) and a thermoplastic resin; Step 7 (S700) of manufacturing a first meltblown nonwoven fabric layer on top of the first spunbond nonwoven fabric layer by mixing and spinning the masterbatch manufactured in Step 5 (S500) and a thermoplastic resin; Step 8 (S800) of manufacturing a second meltblown nonwoven fabric layer on top of the first meltblown nonwoven fabric layer by mixing and spinning the masterbatch manufactured in Step 5 (S500) and a thermoplastic resin; and Step 9 of manufacturing a nonwoven fabric laminate by manufacturing a second spunbond nonwoven fabric layer on top of the second meltblown nonwoven fabric layer by mixing and spinning the masterbatch manufactured in Step 5 (S500) and a thermoplastic resin. A method for manufacturing an antibacterial composite nonwoven fabric, comprising: a step (S900); and a tenth step (S1000) of heat-pressing the nonwoven fabric laminate manufactured in the ninth step (S900) using a calender roll. Claim 2 A method for manufacturing an antibacterial composite nonwoven fabric according to claim 1, wherein the nonwoven fabric laminate comprises: a first spunbond nonwoven fabric layer; a first meltblown nonwoven fabric layer provided on top of the first spunbond nonwoven fabric layer; a second meltblown nonwoven fabric layer provided on top of the first meltblown nonwoven fabric layer; and a second spunbond nonwoven fabric layer provided on top of the second meltblown nonwoven fabric layer. Claim 3 A method for manufacturing an antibacterial composite nonwoven fabric according to claim 1, characterized in that the heat treatment in the fourth step (S400) is performed at 200 to 400 ℃ for 20 to 40 hours. Claim 4 A method for manufacturing an antibacterial composite nonwoven fabric according to claim 1, characterized in that it contains 1.0 to 5.0 weight% of a zeolite antibacterial agent during mixed spinning in steps 6 to 9. Claim 5 A method for manufacturing an antibacterial composite nonwoven fabric according to claim 1, characterized in that the thermoplastic resin is polypropylene. Claim 6 A method for manufacturing an antibacterial composite nonwoven fabric according to claim 1, characterized in that the average particle size of the zeolite antibacterial agent is 500 to 800 nanometers. Claim 7 A method for manufacturing an antibacterial composite nonwoven fabric according to claim 1, characterized in that the average diameter of the constituent fibers of the first meltblown nonwoven fabric layer and the second meltblown nonwoven fabric layer is 1.5 to 3.0 μm, and the average diameter of the constituent fibers of the first spunbond nonwoven fabric layer and the second spunbond nonwoven fabric layer is 2.0 to 4.5 μm. Claim 8 A method for manufacturing an antibacterial composite nonwoven fabric according to claim 1, characterized in that, in the 10th step, the temperature of the calender roll is 130 to 170 ℃, the progress speed of the laminate is 2 to 10 m / min, and the pressure is 50 to 200 N / mm. Claim 9 An antibacterial composite nonwoven fabric manufactured through the method for manufacturing an antibacterial composite nonwoven fabric of any one of claims 1 to 8. Claim 10 The antibacterial composite nonwoven fabric of claim 9, characterized in that the antibacterial composite nonwoven fabric is for manufacturing cleanroom dustproof clothing.

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