Composite non-woven fabric and article comprising the same

Abstract

Disclose a composite non-woven fabric and an article comprising the same. The non-woven fabric disclosed in the present invention comprises an electrocharged melt-blown non-woven fabric layer and spunbond non-woven fabric layers on one or both sides thereof. Among them, the retention rate of the fine dust prevention performance is greater than or equal to 80%, and the retention rate of the fine dust prevention performance is represented by the following mathematical formula 1: [Mathematical formula 1] Retention rate of fine dust prevention performance (%) = (Fine dust prevention efficiency after accelerated aging treatment) / (Fine dust prevention efficiency before accelerated aging treatment) × 100 In the above formula, the fine dust is an aerosol including sodium chloride dispersed in the air, and the accelerated aging treatment means storing the composite non-woven fabric for 3 days under the temperature condition of 70°C.

Description

Technical Field

[0001] Disclosed is a composite non-woven fabric and an article including the same. More specifically, disclosed is a composite non-woven fabric having excellent mechanical properties and fine dust-proof function, and an article including the same. Background Art

[0002] A fine dust-proof mask is composed of an inner layer, an outer layer, and a filter material for filtering fine dust in a central portion in a multi-layer composite structure.

[0003] Currently, an electret-treated melt-blown non-woven fabric is mainly used as a filter layer. The melt-blown non-woven fabric has low mechanical strength, high flexibility, and poor shape stability. Therefore, when it is subjected to external impact or friction, its structure is likely to be deformed. Therefore, in order to protect the melt-blown non-woven fabric layer and impart shape stability, a non-woven fabric having high mechanical properties such as shape stability and tensile strength is laminated on one or both sides of the melt-blown non-woven fabric layer to form a mask, which is mainly laminated by a spunbond non-woven fabric through an additional lamination process.

[0004] In addition, usually, a spunbond non-woven fabric is used as an inner layer and an outer layer on one or both sides of the electret-treated melt-blown material. Since the filaments of the spunbond non-woven fabric are relatively thick and the pores are relatively large, it only has the function of imparting shape stability without fine dust-proof efficiency. Therefore, only the filter layer located in the center of the multi-layer mask non-woven fabric structure filters fine dust. Therefore, there is a problem that fine dust accumulates on the filter layer and the filtration efficiency decreases with the use time. In particular, in an industrial site where a mask must be worn for a long time, this problem may also affect the respiratory safety of the wearer.

[0005] In addition, the non-woven fabrics used as the inner layer and the outer layer are mainly laminated by ultrasonic welding according to the shape of the mask. Therefore, during the welding process, the structure of the electret-treated melt-blown non-woven fabric in the inner layer changes, which may cause a decrease in filtration performance. Summary of the Invention

[0006] Technical Problem

[0007] One embodiment of the present invention provides a composite non-woven fabric having excellent mechanical properties and fine dust-proof function.

[0008] Another embodiment of the present invention provides an article including the non-woven fabric.

[0009] Technical Solution

[0010] One aspect of the present invention provides a composite non-woven fabric, which includes:

[0011] an electret-treated melt-blown non-woven fabric layer and a spunbond non-woven fabric layer on one or both sides thereof,

[0012] Among them, the anti-fine dust performance retention rate is greater than or equal to 80%, and the anti-fine dust performance retention rate is represented by the following Mathematical Formula 1:

[0013]

Mathematical Formula 1

[0014] Anti-fine dust performance retention rate (%) = (Anti-fine dust efficiency after accelerated aging treatment) / (Anti-fine dust efficiency before accelerated aging treatment) × 100

[0015] In the above formula, the fine dust is an aerosol including sodium chloride dispersed in the air, and the accelerated aging treatment means storing the composite non-woven fabric for 3 days under the temperature condition of 70°C.

[0016] The pressure loss retention rate of the composite non-woven fabric can be greater than or equal to 90%, and the pressure loss retention rate is represented by the following Mathematical Formula 2:

[0017]

Mathematical Formula 2

[0018] Pressure loss retention rate (%) = (Pressure loss after accelerated aging treatment) / (Pressure loss before accelerated aging treatment) × 100

[0019] In the above formula, the pressure loss is measured using an aerosol including sodium chloride dispersed in the air, and the accelerated aging treatment means storing the composite non-woven fabric for 3 days under the temperature condition of 70°C.

[0020] After the accelerated aging treatment, the anti-fine dust rate of the composite non-woven fabric can be 18% to 99%.

[0021] The charged melt-blown non-woven fabric layer and the spunbond non-woven fabric layer can each independently include a non-conductive polymer, and the non-conductive polymer can include polyolefin, polystyrene, polycarbonate, polyester, polyamide, and their copolymers or their compositions.

[0022] Based on the total weight of 100 parts by weight of the composite non-woven fabric, the content of the charged melt-blown non-woven fabric layer is 3 parts by weight to 50 parts by weight.

[0023] On the other hand, the present invention provides a non-woven fabric laminate.

[0024] An article including the composite non-woven fabric is provided.

[0025] The article can be an anti-fine dust mask, an air purifier filter element, or an air conditioner filter element.

[0026] Advantageous Effects

[0027] The composite non-woven fabric according to an embodiment of the present invention can be used as a material for filtering fine particles in the air.

[0028] In addition, when the composite non-woven fabric is compounded with an electrified melt-blown filter layer that is currently used as a mask filter layer, it can prevent contamination of the filter layer and extend its lifespan. Moreover, due to its excellent morphological stability and the multi-layer structure of the filter layer, the overall performance of the mask and the stability of the fine dust prevention efficiency can be improved.

[0029] In addition, the composite non-woven fabric can be used to prevent various dusts, fine dusts, bacteria, etc. It can be applied not only to masks but also to various household, vehicle, and industrial air conditioners and air purifiers that require air purification. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 FIG. is a schematic diagram showing a composite non-woven fabric manufacturing apparatus for continuously manufacturing a composite non-woven fabric according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] Hereinafter, a composite non-woven fabric according to an embodiment of the present invention will be described in detail.

[0032] In this specification, "non-woven fabric composite" refers to a non-woven fabric in which two or more non-woven fabrics are manufactured through a continuous process and integrated, rather than a non-woven fabric laminate manufactured by separately manufacturing two or more non-woven fabrics and then laminating them additionally. In addition, "composite non-woven fabric" can also be referred to as "monolithic non-woven fabric". The composite non-woven fabric is characterized by having a higher interlayer bonding ability than the non-woven fabric laminate, and more excellent morphological stability and filtration performance.

[0033] In addition, in this specification, "electrified melt-blown non-woven fabric layer" can be a composite non-woven fabric manufactured through a continuous process. Specifically, the "electrified melt-blown non-woven fabric layer" can be manufactured by simultaneously performing "manufacture of melt-blown non-woven fabric" and "electrification treatment" in a sequential or continuous process.

[0034] A composite non-woven fabric according to an embodiment of the present invention includes an electrified melt-blown non-woven fabric layer and a spunbond non-woven fabric layer on one or both sides thereof.

[0035] The plurality of non-woven fabrics included in the composite non-woven fabric can be bonded to each other by heat fusion instead of ultrasonic welding.

[0036] The composite non-woven fabric is characterized by having a fine particle capture function by including an electrified melt-blown non-woven fabric layer. However, the average pore size of existing spunbond-meltblown multi-layer non-woven fabrics is in the range of several μm to dozens of μm, so they hardly have the function of preventing fine particles in the range of 0.1 μm to 0.6 μm.

[0037] In addition, the retention rate of the fine dust-proof performance of the composite non-woven fabric is greater than or equal to 80%, and the retention rate of the fine dust-proof performance is represented by the following Mathematical Formula 1:

[0038]

Mathematical Formula 1

[0039] Retention rate of fine dust-proof performance (%) = (Fine dust-proof efficiency after accelerated aging treatment) / (Fine dust-proof efficiency before accelerated aging treatment) × 100

[0040] In the above formula, the fine dust is an aerosol including sodium chloride dispersed in the air, and the accelerated aging treatment means storing the composite non-woven fabric for 3 days under the temperature condition of 70°C.

[0041] The fact that the retention rate of the fine dust-proof performance is greater than or equal to 80% means that the filtration performance of the composite non-woven fabric can be maintained for a long time.

[0042] In addition, the retention rate of the pressure loss of the composite non-woven fabric is greater than or equal to 90%, and the retention rate of the pressure loss is represented by the following Mathematical Formula 2:

[0043]

Mathematical Formula 2

[0044] Retention rate of pressure loss (%) = (Pressure loss after accelerated aging treatment) / (Pressure loss before accelerated aging treatment) × 100

[0045] In the above formula, the pressure loss is measured by using an aerosol including sodium chloride dispersed in the air, and the accelerated aging treatment means storing the composite non-woven fabric for 3 days under the temperature condition of 70°C.

[0046] The fact that the retention rate of the pressure loss is greater than or equal to 90% means that the morphological stability (i.e., structural stability) of the composite non-woven fabric can be maintained for a long time.

[0047] In addition, after the accelerated aging treatment, the fine dust-proof rate of the composite non-woven fabric can be 18% to 99%. When the fine dust-proof rate after the accelerated aging treatment is within the above range, the filtration performance, morphological stability, and production efficiency of the composite non-woven fabric can all be maintained at a high level.

[0048] The electrified melt-blown non-woven fabric layer and the spunbond non-woven fabric layer may independently include a non-conductive polymer.

[0049] The non-conductive polymer may include polyolefin, polystyrene, polycarbonate, polyester, polyamide, and their copolymers or their compositions.

[0050] The polyolefin may include polyethylene, polypropylene, poly-4-methyl-1-pentene, polyvinyl chloride, or their combination.

[0051] The polyester may include polyethylene terephthalate, polylactic acid, or a combination thereof.

[0052] The electrified meltblown nonwoven fabric layer and the spunbond nonwoven fabric layer may each independently further include an additive.

[0053] The additive may include a pigment, a light stabilizer, a primary antioxidant, a secondary antioxidant, a metal deactivator, a hindered amine, a hindered phenol, a fatty acid metal salt, a triester of phosphorous acid, a phosphate, a fluorine-containing compound, a nucleating agent, or a combination thereof.

[0054] Additionally, in one embodiment, the antioxidant may act as a charge enhancer. The charge enhancer preferably includes a thermally stable organic triazine compound, an oligomer, or a combination thereof, and these compounds or oligomers further contain at least one nitrogen atom in addition to the nitrogen in the triazine ring.

[0055] For example, U.S. Patent Nos. 6,268,495, 5,976,208, 5,968,635, 5,919,847, and 5,908,598 disclose charge enhancers aimed at improving electrification characteristics. For example, the charge enhancer may include a hindered amine-based additive, a triazine additive, or a combination thereof.

[0056] As other examples, the charge enhancer may include poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]] (manufactured by BASF, CHIMASSORB 944), a polymer of the reaction product of N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine with 2,4,6-trichloro-1,3,5-triazine and N-butyl-1-butylamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine (manufactured by BASF, CHIMASSORB 2020), or a combination thereof.

[0057] The charge enhancer may be an N-substituted amino aromatic compound, particularly, it may be a triamino-substituted compound, for example, ethylhexyl triazone (2,4,6-trianilino-p-(carbo-2'-ethylhexyl-1'-oxy)-1,3,5-triazine) (manufactured by BASF, UVINUL T-150). Other charge enhancers are known as 2,4,6-tri-(octadecylamino)-triazine of "TSM".

[0058] Based on the total weight of 100 parts by weight of the meltblown nonwoven fabric layer, the content of the charge enhancer may be 0.25 parts by weight to 5 parts by weight. When the content of the charge enhancer is within the above range, a high level of electrification performance desired by the present invention can be obtained, and the spinnability is good, the nonwoven fabric maintains high strength and is advantageous in terms of cost.

[0059] In addition to the above additives, the composite nonwoven fabric may further include known additives such as heat stabilizers, weathering agents, etc.

[0060] Based on the total weight of 100 parts by weight of the composite nonwoven fabric, the content of the electrified meltblown nonwoven fabric layer may be 3 parts by weight to 50 parts by weight. When the content of the electrified meltblown nonwoven fabric layer is within the above range, a composite nonwoven fabric with excellent filtration performance, morphological stability and durability can be obtained.

[0061] The basis weight (mass per unit area) of the composite nonwoven fabric may range from 10 g / m 2 to 500 g / m 2 , for example, from 20 g / m 2 to 100 g / m 2 .

[0062] Hereinafter, a method for manufacturing a composite nonwoven fabric according to an embodiment of the present invention will be described in detail.

[0063] The method for manufacturing a composite nonwoven fabric according to an embodiment of the present invention may include the following steps: S10, continuously forming a spunbond nonwoven fabric layer; and S20, continuously forming a meltblown nonwoven fabric layer on the spunbond nonwoven fabric layer.

[0064] The step S10 of continuously forming the spunbond nonwoven fabric layer may be to form fiber yarns by melt-extruding, cooling and stretching a thermoplastic non-conductive polymer, and then laminating the fiber yarns on a mesh belt for webforming.

[0065] The step S20 of continuously forming the meltblown nonwoven fabric layer may be to form fiber yarns by melting and extruding, hot air stretching, and cooling a thermoplastic non-conductive polymer and an electrification property improver, and then laminating the fiber yarns onto the spunbond that is meshed through the step S10 of continuously forming the spunbond nonwoven fabric layer for meshing.

[0066] Specifically, the step S20 of continuously forming the meltblown nonwoven fabric layer may include: S20-1, continuously forming free fibers from a non-conductive polymer; S20-2, continuously spinning the free fibers; S20-3, continuously spraying a polar solvent (e.g., water) onto the free fibers to continuously electrify the free fibers; and S20-4, continuously laminating the free fibers to continuously form a meltblown nonwoven fabric.

[0067] The step S20-3 of continuously electrifying the free fibers may be performed by continuously spraying the polar solvent and a gas (e.g., air).

[0068] Hereinafter, the different properties or remarkable effects of the step S20-3 of continuously electrifying the free fibers compared with the prior art will be described in detail.

[0069] (1) Generally, in the industrial field, the following methods are mainly applicable to manufacture electrified meltblown nonwoven fabrics. The methods capable of performing electrification treatment in the meltblown process are, as shown in U.S. Registered Patent No. 6,375,886, a method of performing electrification treatment through the friction between a polar solvent and a filament being melt-spun, and as shown in U.S. Registered Patent No. 6,969,484, a method of immersing the meltblown nonwoven fabric in a polar solvent and then water seeps into the nonwoven fabric through a water absorption device, thereby performing electrification treatment through the friction between water and the nonwoven fabric. As described above, the electrification treatment method using a polar solvent requires an additional subsequent process of drying the polar solvent after the electrification treatment, so in principle, it is impossible to laminate or composite nonwoven fabrics through a continuous process. The disclosures of U.S. Registered Patent Nos. 6,375,886 and 6,969,484 are incorporated herein by reference in their entirety.

[0070] (2) U.S. Registered Patent No. 5,227,172 discloses a method of applying a high potential difference between a meltblown die and a collector, thereby making the melt-spun resin filamentize and being inductively electrified by the surrounding electric field. Through this method, an electrified meltblown nonwoven fabric can be obtained without additional post-processing. However, the nonwoven fabric inductively electrified through the potential difference will have a phenomenon that the electrification treatment efficiency drops due to heat or a sudden change in the surrounding environment, so it is difficult to be used for items such as anti-dust masks that need to be stored for a long time during the sales process or air purifier filters that require a long service life. The disclosure of U.S. Registered Patent No. 5,227,172 is incorporated herein by reference in its entirety.

[0071] The present inventor has developed an electrification treatment device that sprays a polar solvent and air together in the form of a two-fluid onto a meltblown nonwoven fabric layer, thereby rubbing polar solvent particles that obtain sufficient kinetic energy through a small spraying amount onto filaments being melt-spun to achieve a high-efficiency triboelectrification effect. The device is characterized in that the air heated within the DCD (Die to collector distance) range due to the small spraying amount is sufficiently heated and evaporated, so that no additional drying equipment is required. Due to this characteristic, the compounding of nonwoven fabrics can be achieved by continuous lamination in combination with the nonwoven fabric manufacturing process.

[0072] The nonwoven fabric obtained by subjecting the meltblown nonwoven fabric to an electrification treatment is in a continuous polarized state such that negative charges and positive charges exist semi-permanently, and this nonwoven fabric is called an electret nonwoven fabric.

[0073] As described above, the method for manufacturing the composite nonwoven fabric may not include an additional drying step to remove the polar solvent sprayed in the free fiber continuous electrification step S20-3.

[0074] In addition, as described above, the polar solvent continuously sprayed in the free fiber continuous electrification step S20-3 can be continuously heated and evaporated by heated air within the DCD (Die to collector distance) range of the composite nonwoven fabric manufacturing equipment.

[0075] The method for manufacturing the composite nonwoven fabric may further include step S30 of continuously forming another spunbond nonwoven fabric layer on the meltblown nonwoven fabric layer.

[0076] After the continuous formation step S20 of the meltblown nonwoven fabric layer or the continuous formation step S30 of the another spunbond nonwoven fabric layer, the method for manufacturing the composite nonwoven fabric layer may further include S40 of continuously thermally bonding each spunbond nonwoven fabric layer to one or both sides of the meltblown nonwoven fabric layer.

[0077] Next, an article according to an embodiment of the present invention will be described in detail.

[0078] An article according to an embodiment of the present invention includes the above-mentioned nonwoven fabric laminate.

[0079] The article may be a fine dust mask, an air purifier filter element, or an air conditioner filter element.

[0080] Next, the present invention will be further described in detail through examples. These examples are only for further specifically describing the present invention, and the scope of the present invention is not limited thereto.

[0081] Example 1: Manufacturing composite nonwoven fabric

[0082] An isotactic polypropylene (LG Chem, H7900) with a melt index (MI) of 34 g / 10 min was used as the polymer for forming the spunbond nonwoven fabric layer (SB), and a resin (LG Chem, H7910) with a melt flow rate (MFR) of 1000 g / 10 min was used as the polymer for forming the meltblown nonwoven fabric layer (MB). Additionally, 0.5 wt% of a hindered amine light stabilizer, Chimasorb 944, was added to the polymer for forming the meltblown nonwoven fabric layer (MB). Then, as Figure 1 shown, a spunbond-meltblown-spunbond (SMS) composite nonwoven fabric was continuously manufactured using a composite nonwoven fabric manufacturing apparatus. Specifically, the meltblown nonwoven fabric layer (MB) was continuously electrified by contacting water with air through a two-fluid nozzle in the composite nonwoven fabric manufacturing apparatus, and then laminated on top of the spunbond nonwoven fabric layer (SB), and another spunbond nonwoven fabric layer (SB) was laminated on top of the meltblown nonwoven fabric layer (MB). Finally, an SMS nonwoven fabric laminate was obtained. Then, the SMS nonwoven fabric laminate was formed into a composite nonwoven fabric by a hot pressing process between a roll with an embossed pattern and a smooth roll. Among them, the total basis weight of the SMS composite nonwoven fabric was adjusted to 100 gsm (g / m 2 ²), and the basis weight of the meltblown nonwoven fabric layer (MB) was adjusted to 22 gsm.

[0083] Example 2: Manufacturing composite nonwoven fabric

[0084] The total basis weight of the SMS composite nonwoven fabric was adjusted to 80 gsm, and the basis weight of the meltblown nonwoven fabric layer (MB) was adjusted to 30 gsm. Except for this, the SMS composite nonwoven fabric was manufactured in the same manner as in Example 1.

[0085] Example 3: Manufacturing composite nonwoven fabric

[0086] The total basis weight of the SMS composite nonwoven fabric was adjusted to 61 gsm, and the basis weight of the meltblown nonwoven fabric layer (MB) was adjusted to 15 gsm. Except for this, the SMS composite nonwoven fabric was manufactured in the same manner as in Example 1.

[0087] Example 4: Manufacturing composite nonwoven fabric

[0088] The total basis weight of the SMS composite nonwoven fabric was adjusted to 55 gsm, and the basis weight of the meltblown nonwoven fabric layer (MB) was adjusted to 13 gsm. Except for this, the SMS composite nonwoven fabric was manufactured in the same manner as in Example 1.

[0089] Example 5: Manufacturing composite nonwoven fabric

[0090] The total basis weight of the SMS composite nonwoven fabric was adjusted to 50 gsm, and the basis weight of the meltblown nonwoven fabric layer (MB) was adjusted to 25 gsm. Except for this, the SMS composite nonwoven fabric was manufactured in the same manner as in Example 1.

[0091] Example 6: Manufacturing composite nonwoven fabric

[0092] The total basis weight of the SMS composite nonwoven fabric was adjusted to 35 gsm, and the basis weight of the meltblown nonwoven fabric layer (MB) was adjusted to 12 gsm. Except for this, the SMS composite nonwoven fabric was manufactured in the same manner as in Example 1.

[0093] Example 7: Manufacturing composite nonwoven fabric

[0094] The total basis weight of the SMS composite nonwoven fabric was adjusted to 35 gsm, and the basis weight of the meltblown nonwoven fabric layer (MB) was adjusted to 8 gsm. Except for this, the SMS composite nonwoven fabric was manufactured in the same manner as in Example 1.

[0095] Example 8: Manufacturing composite nonwoven fabric

[0096] The total basis weight of the SMS composite nonwoven fabric was adjusted to 20 gsm, and the basis weight of the meltblown nonwoven fabric layer (MB) was adjusted to 3 gsm. Except for this, the SMS composite nonwoven fabric was manufactured in the same manner as in Example 1.

[0097] Comparative Example 1: Manufacturing single meltblown nonwoven fabric

[0098] A meltblown single nonwoven fabric was manufactured in the same manner as in Example 2, except that the spunbond nonwoven fabric layer (SB) was omitted.

[0099] Comparative Example 2: Manufacturing composite nonwoven fabric

[0100] An SMS composite nonwoven fabric was manufactured in the same manner as in Example 3, except that the meltblown nonwoven fabric layer (MB) was not electrified.

[0101] Comparative Example 3: Manufacturing single meltblown nonwoven fabric

[0102] A meltblown single nonwoven fabric was manufactured in the same manner as in Example 3, except that the spunbond nonwoven fabric layer (SB) was omitted.

[0103] Comparative Example 4: Manufacturing composite nonwoven fabric

[0104] An SMS composite nonwoven fabric was manufactured in the same manner as in Example 7, except that the meltblown nonwoven fabric layer (MB) was not electrified.

[0105] Comparative Example 5: Manufacturing composite nonwoven fabric

[0106] An SMS composite nonwoven fabric was manufactured in the same manner as in Example 8, except that the meltblown nonwoven fabric layer (MB) was not electrified.

[0107] Comparative Example 6: Manufacturing nonwoven fabric laminate

[0108] Two spunbond nonwoven fabric layers (SB) and one meltblown nonwoven fabric layer (MB) were manufactured separately and then laminated to each other to manufacture an SMS nonwoven fabric laminate. Among them, the meltblown nonwoven fabric layer (MB) was electrified by the electrification treatment method disclosed in U.S. Registered Patent No. 6,375,886. In addition, the total basis weight of the SMS nonwoven fabric laminate was adjusted to 100 gsm (g / m 2 ), which is the same as that in Example 1. Among them, the basis weight of the meltblown nonwoven fabric layer (MB) was adjusted to 22 gsm.

[0109] Reference Example 1: Manufacturing nonwoven fabric laminate

[0110] An SMS composite nonwoven fabric was manufactured in the same manner as in Example 1, except that the meltblown nonwoven fabric layer (MB) was electrified by the electrification treatment method disclosed in U.S. Registered Patent No. 5,227,172.

[0111] Evaluation Example: Evaluating physical properties of nonwoven fabric

[0112] The fine dust prevention performance retention rate and pressure loss retention rate of each nonwoven fabric manufactured in Examples 1 to 8, Comparative Examples 1 to 6, and Reference Example 1 were evaluated by the following method, and the results are shown in Table 1 below.

[0113] (1) Detection equipment: Model TSI-8130 of TSI Incorporated was used.

[0114] (2) Formation of aerosol: The sodium chloride aqueous solution and air were brought into contact through the detection equipment and then the water was evaporated to form an aerosol including sodium chloride dispersed in the air with an average particle size of 0.3 μm and a sodium chloride particle concentration of 18.5 mg / m 3 .

[0115] (3) Evaluation of aerosol prevention efficiency: The seepage flow rate of the aerosol was 95 L / min, and the evaluation area of the nonwoven fabric was 100 cm 2 .

[0116] (4) Evaluation of pressure loss: The seepage flow rate of the aerosol was 30 L / min, and the evaluation area of the nonwoven fabric was 100 cm 2 .

[0117] (5) Accelerated aging treatment: The nonwoven fabric was stored in an oven at 70 °C for 3 days.

[0118] (6) Evaluate the anti-aerosol efficiency and pressure loss before and after the accelerated aging treatment.

[0119] (7) Calculate the fine dust performance retention rate and pressure loss retention rate according to the mathematical formula 1 or the mathematical formula 2.

[0120] [Table 1]

[0121]

[0122]

[0123] Referring to Table 1 above, the composite nonwoven fabrics manufactured in Examples 1 to 8 showed a fine dust performance retention rate and a pressure loss retention rate of greater than or equal to 80% respectively, and a fine dust rate (i.e., anti-aerosol rate) of greater than or equal to 18% after the accelerated aging treatment.

[0124] However, the nonwoven fabrics manufactured in Comparative Examples 1 and 3 showed a pressure loss retention rate of greater than or equal to 90%, and the fine dust rate after the accelerated aging treatment was also greater than or equal to 18%, but the fine dust performance retention rate was less than 80%.

[0125] In addition, the nonwoven fabrics manufactured in Comparative Examples 2, 4, and 5 showed a fine dust performance retention rate of greater than or equal to 80%, and the pressure loss retention rate was also greater than or equal to 90%, but the fine dust rate after the accelerated aging treatment was less than 18%.

[0126] In addition, the nonwoven fabric manufactured in Comparative Example 6 showed a pressure loss retention rate of greater than or equal to 90%, and the fine dust rate after the accelerated aging treatment was also greater than or equal to 18%, but the fine dust performance retention rate was less than 80%.

[0127] In addition, the nonwoven fabric manufactured in Reference Example 1 showed a pressure loss retention rate of greater than or equal to 90%, and the fine dust rate after the accelerated aging treatment was also greater than or equal to 18%, but the fine dust performance retention rate was less than 80%.

[0128] Although the present invention has been described with reference to the accompanying drawings and embodiments, this is only exemplary, and those skilled in the art can understand that various modifications and equivalent other embodiments can be made therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical concept of the appended claims.

Claims

1. A composite non-woven fabric, which comprises: a melt-blown non-woven fabric layer and spunbond non-woven fabric layers on both sides thereof, wherein the composite non-woven fabric refers to a single-piece non-woven fabric prepared, in which two or more non-woven fabrics are manufactured through a continuous process and integrated into one body, rather than a non-woven fabric laminate made by separately manufacturing two or more non-woven fabrics and then laminating them additionally, wherein the melt-blown non-woven fabric layer is electrified, that is, in the composite non-woven fabric manufacturing equipment, it is continuously electrified by contacting water together with air through a two-fluid nozzle to form an electrified melt-blown non-woven fabric layer, wherein the microdust-proof performance retention rate of the composite non-woven fabric is greater than or equal to 80%, and the microdust-proof performance retention rate is represented by the following Mathematical Formula 1: 【Mathematical Formula 1】 Microdust-proof performance retention rate (%) = (Microdust-proof efficiency after accelerated aging treatment) / (Microdust-proof efficiency before accelerated aging treatment) × 100 In the above formula, the microdust is an aerosol including sodium chloride dispersed in the air, and the accelerated aging treatment means storing the composite non-woven fabric for 3 days under the temperature condition of 70°C.

2. The composite non-woven fabric according to claim 1, wherein, the pressure loss retention rate of the composite non-woven fabric is greater than or equal to 90%, and the pressure loss retention rate is represented by the following Mathematical Formula 2: 【Mathematical Formula 2】 Pressure loss retention rate (%) = (Pressure loss after accelerated aging treatment) / (Pressure loss before accelerated aging treatment) × 100 In the above formula, the pressure loss is measured using an aerosol including sodium chloride dispersed in the air, and the accelerated aging treatment means storing the composite non-woven fabric for 3 days under the temperature condition of 70°C.

3. The composite non-woven fabric according to claim 1, wherein, its microdust-proof rate after the accelerated aging treatment is 18% to 99%.

4. The composite non-woven fabric according to claim 1, wherein, the electrified melt-blown non-woven fabric layer and the spunbond non-woven fabric layer each independently include a non-conductive polymer, and the non-conductive polymer includes polyolefin, polystyrene, polycarbonate, polyester, polyamide, and their copolymers or their compositions.

5. The composite non-woven fabric according to claim 1, wherein, based on the total weight of 100 parts by weight of the composite non-woven fabric, the content of the electrified melt-blown non-woven fabric layer is 3 parts by weight to 50 parts by weight.

6. An article, which comprises: the composite non-woven fabric according to any one of claims 1 to 5.

7. The article according to claim 6, wherein, the article is a microdust-proof mask, an air purifier filter element, or an air conditioner filter element.

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