KR102584561B1 - Non-woven fabric composite and article including the non-woven fabric composite - Google Patents

Abstract

Composite nonwoven fabrics and articles are disclosed. The disclosed composite nonwoven fabric includes a first spunbonded nonwoven fabric layer, a meltblown nonwoven fabric layer, and a second spunbonded nonwoven fabric layer, and at least one of the first spunbonded nonwoven fabric layer and the second spunbonded nonwoven fabric layer is an insect repellent master for nonwoven fabrics. and a batch, wherein the meltblown nonwoven fabric layer is at least partially charged, the insect repellent masterbatch for nonwoven fabrics includes a base resin, an insect repellent component, and a carrier material, and the insect repellent component in the insect repellent masterbatch for nonwoven fabrics is The content is 300 to 500 ppm by weight, and the content of the carrier material is 30,000 to 50,000 ppm by weight.

Description

Non-woven fabric composite and article including the non-woven fabric composite}

Composite nonwoven fabrics and articles are disclosed. More specifically, composite non-woven fabrics and articles that can be used as non-woven fabrics for various purposes such as hygiene, bedding, and agriculture are disclosed, as the inclusion of insect repellent that is harmless to the human body can improve antibacterial properties along with insect repellent and growth inhibition effects.

Conventional non-woven fabrics had satisfactory mechanical strength and fine dust removal function, but lacked insect repellent functionality and antibacterial properties, causing problems with pests approaching them during storage and irritating the skin when contaminated with bacteria.

One embodiment of the present invention provides a composite nonwoven fabric.

Another embodiment of the present invention provides an article comprising the composite nonwoven fabric.

One aspect of the present invention is,

It includes a first spunbond nonwoven fabric layer, a meltblown nonwoven fabric layer, and a second spunbond nonwoven fabric layer,

At least one of the first spunbonded nonwoven fabric layer and the second spunbonded nonwoven fabric layer includes an insect repellent masterbatch for nonwoven fabrics,

The meltblown nonwoven layer is at least partially charged,

The insect repellent masterbatch for non-woven fabrics includes a base resin, an insect repellent ingredient, and a carrier material. In the insect repellent masterbatch for non-woven fabrics, the content of the insect repellent ingredient is 300 to 500 ppm by weight, and the content of the carrier material is 30,000 ppm by weight. Provides composite nonwovens with ~50,000 ppm.

The base resin may include a non-conductive polymer selected from polyolefin, polystyrene, polycarbonate, polyester, polyamide, copolymers thereof, or combinations thereof.

The insect repellent ingredient may include cinnamaldehyde, α-copaene, apiol, oleic acid, or a combination thereof.

The carrier material may include silica, zeolite, kaolin, or combinations thereof.

The insect repellent masterbatch for nonwoven fabrics may have a dispersion index of 0.6 or more and less than 1.0.

The composite nonwoven fabric may include the first spunbond nonwoven fabric layer, the meltblown nonwoven fabric layer, and the second spunbond nonwoven fabric layer in this order.

The first spunbond nonwoven fabric layer and the second spunbond nonwoven fabric layer may each include a plurality of spunbond nonwoven fabric sublayers.

The meltblown nonwoven fabric layer may contain an insect repellent.

The meltblown nonwoven fabric layer may further include at least one non-charged meltblown nonwoven fabric sublayer in addition to at least one charged meltblown nonwoven fabric sublayer.

The composite nonwoven fabric may further include at least one additional layer.

At least one of the first spunbond nonwoven fabric layer and the second spunbond nonwoven fabric layer may include the insect repellent masterbatch for nonwoven fabrics in a ratio of 5 to 20% by weight based on the weight of each.

The composite nonwoven fabric may have a bacteriostatic activity value of 5.0 or more for Staphylococci and a bacteriostatic activity value for pneumococci measured according to the bacteriostatic activity value measurement method (JIS L 1902) of 6.0 or more.

The composite nonwoven fabric has an insect repellent evasion rate of adult mealworms of more than 60% one week after treatment, and can exhibit a sustained performance of more than 40% even two weeks after treatment.

The composite nonwoven fabric may have a skin patch test grade of grade 1 or higher.

The composite nonwoven fabric may have a colorimetric deviation (ΔE ^* ) of 2.0 to 3.0.

The composite nonwoven fabric can exhibit breathability performance of 300 to 700 cm ³ /cm ² /s.

The composite nonwoven fabric has a maximum breaking strength of 40~60N/5cm, at which time the breaking elongation is 40~80%, and the abrasion fluff evaluation grade may be grade 1 or 2.

Another aspect of the present invention is,

An article comprising the composite nonwoven fabric is provided.

The article may be a health or medical article.

The insect repellent masterbatch for non-woven fabrics manufactured according to the manufacturing method of the insect repellent masterbatch for non-woven fabrics according to an embodiment of the present invention contains insect repellent that is harmless to the human body, so that it can have insect repellent and proliferation inhibition effects and also improve antibacterial properties, so it can be used for hygiene, It can be applied to nonwoven fabrics for various purposes such as bedding and agriculture.

1 is a diagram schematically showing a composite nonwoven fabric according to an embodiment of the present invention.
Figure 2 is a diagram schematically showing a composite nonwoven fabric manufacturing apparatus used to continuously manufacture composite nonwoven fabric according to an embodiment of the present invention.

Hereinafter, a composite nonwoven fabric according to an embodiment of the present invention will be described in detail.

As used herein, “liquid insect repellent” refers to an insect repellent in the form of a solution, oil, or suspension.

Also, in this specification, “dispersion index” refers to a value obtained by dividing the discharge amount by the input amount when spinning the insect repellent masterbatch for nonwoven fabrics through a spinning nozzle.

In addition, in this specification, "non-woven fabric composite" refers to not a non-woven fabric laminate manufactured by individually manufacturing two or more types of non-woven fabrics and then going through a separate laminating (lamination) post-process, but two or more types of non-woven fabrics as one It refers to a nonwoven fabric manufactured through a continuous process in each device and integrated. Therefore, in this specification, “composite non-woven fabric” may also be referred to as “monolithic non-woven fabric.” The composite nonwoven fabric has the characteristics of strong interlayer bonding, excellent shape stability, and filtration performance compared to the nonwoven fabric laminate.

Additionally, in this specification, the “charged meltblown nonwoven fabric layer” or “charged meltblown nonwoven fabric sublayer” may be manufactured through a continuous process. Specifically, the “charged meltblown nonwoven fabric layer” or “charged meltblown nonwoven fabric sublayer” is manufactured by sequentially or simultaneously performing “manufacture of meltblown nonwoven fabric” and “charged treatment” in a continuous process. It may have happened.

In addition, in this specification, "charged" means a state in which an electric charge is semi-permanently imparted to the nonwoven fibers to form an electrostatic field between adjacent fibers, and the charged nonwoven fabric has less charge than the uncharged nonwoven fabric. It has the characteristics of high density and fine dust removal efficiency.

In addition, in this specification, "tensile strength" refers to MD obtained by stretching a test piece with a width of 5 cm (grip spacing of 10 cm during evaluation) under the condition of a tensile speed of 500 mm/min according to KSK 0520 through a tensile strength stretcher (Instron). The tensile strength in each mechanical direction was measured.

In addition, in this specification, “stiffness” refers to 16 samples (25 mm The length of the sample was measured in mm from the point where it bends to the point where it touches the inclined surface.

In addition, in this specification, “fine dust transmittance”, “fine dust removal efficiency” and “pressure loss” were evaluated for the composite nonwoven fabric after production and before use by the following method:

(1) Measuring device: TSI's TSI-8130 model was used.

(2) Aerosol formation: The measuring device evaporated the water in the sodium chloride aqueous solution mist generated from the fine aerosol generating device to form sodium chloride aerosol dispersed in the air. The average particle diameter of sodium chloride particles in the formed sodium chloride aerosol was 0.3㎛, and the concentration of sodium chloride in the aerosol was 18.5mg/m ³ .

(3) Evaluation of fine dust transmission rate: The penetration surface velocity of the aerosol was 16 cm/sec, and the evaluation area of the nonwoven fabric was 100 cm ² . The transmittance of the aerosol particles was recorded as the fine dust transmittance.

(4) Evaluation of aerosol removal efficiency: The permeation velocity of the aerosol was 16 cm/sec, and the evaluation area of the nonwoven fabric was 100 cm ² . The aerosol removal efficiency was recorded as fine dust removal efficiency.

(5) Pressure loss evaluation: The permeation velocity of the aerosol was 16 cm/sec, and the evaluation area of the nonwoven fabric was 100 cm ² .

The composite nonwoven fabric according to one embodiment of the present invention includes a first spunbond nonwoven fabric layer, a meltblown nonwoven fabric layer, and a second spunbond nonwoven fabric layer.

At least one of the first spunbond nonwoven fabric layer and the second spunbond nonwoven fabric layer includes an insect repellent masterbatch for nonwoven fabrics.

The insect repellent masterbatch for non-woven fabrics includes a base resin, an insect repellent ingredient, and a carrier material. In the insect repellent masterbatch for non-woven fabrics, the content of the insect repellent ingredient is 300 to 500 ppm by weight, and the content of the carrier material is 30,000 ppm by weight. It is ~50,000ppm. If the content of the insect repellent ingredient and the content of the carrier material are within the above range, both the insect repellent performance and the dispersion index of the insect repellent masterbatch for nonwoven fabrics may be excellent. If at least one of the content of the insect repellent ingredient and the content of the carrier material is outside the above range, at least one of the insect repellent performance and dispersion index of the insect repellent masterbatch for nonwoven fabrics may be inferior.

Hereinafter, a method for manufacturing an insect repellent masterbatch for nonwoven fabrics according to an embodiment of the present invention will be described in detail.

The method for producing an insect repellent masterbatch for nonwoven fabrics according to an embodiment of the present invention includes the step (S10) of mixing raw materials including a base resin, a liquid insect repellent, and a carrier material to obtain a raw material mixture.

The content of the liquid insect repellent in the raw materials is 9,000 to 11,000 ppm by weight, and the content of the carrier material in the raw materials is 30,000 to 50,000 ppm by weight.

If the content of the liquid insect repellent and the content of the carrier material are within the above ranges, an insect repellent masterbatch for non-woven fabrics with excellent insect repellent performance and dispersion index can be obtained. If at least one of the content of the liquid insect repellent and the content of the carrier material is outside the above range, an insect repellent masterbatch for non-woven fabrics that is inferior in at least one of the insect repellent performance and the dispersion index may be obtained.

The base resin may include a non-conductive polymer selected from polyolefin, polystyrene, polycarbonate, polyester, polyamide, copolymers thereof, or combinations thereof.

The polyolefin may include polyethylene, polypropylene, poly-4-methyl-1-pentene, polyvinyl chloride, or a combination thereof.

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

The liquid insect repellent may be a natural insect repellent extracted from plants. For example, the liquid insect repellent may have a solid content of 3 to 5% by weight.

The liquid insect repellent may include cinnamaldehyde, α-copaene, apiol, oleic acid, or a combination thereof. Therefore, in the insect repellent masterbatch for nonwoven fabrics, the insect repellent ingredient may also include cinnamaldehyde, α-copaene, apiol, oleic acid, or a combination thereof.

The carrier material may serve as a bridge between the liquid insect repellent and the base resin and at the same time increase the dispersion index of the insect repellent masterbatch for nonwoven fabrics.

Additionally, the carrier material may include silica, zeolite, kaolin, or a combination thereof.

In addition, the method of manufacturing the insect repellent masterbatch for nonwoven fabrics may further include the step (S20) of extruding the raw material mixture into pellets after the step (S10).

The insect repellent ingredient may be the residue of the liquid insect repellent described above. Therefore, the insect repellent ingredient may include cinnamaldehyde, α-copaene, apiol, oleic acid, or a combination thereof.

In addition, the insect repellent masterbatch for nonwoven fabrics may have a dispersion index of 0.6 or more and less than 1.0. If the dispersion index of the insect repellent masterbatch for non-woven fabrics is less than 0.6, when attempting to manufacture non-woven fabric by adding the insect repellent master batch for non-woven fabrics, spinning becomes impossible due to increased extruder and die pressure, making it difficult to use the insect repellent master batch for non-woven fabrics. It becomes impossible. In addition, if the insect repellent masterbatch for nonwoven fabrics does not contain the carrier material, its dispersion index becomes 1.0, and if it contains even a small amount of the carrier material, its dispersion index becomes less than 1.0.

The composite nonwoven fabric has insect repellent and antibacterial functions.

The composite nonwoven fabric may include a first spunbond nonwoven fabric layer, a meltblown nonwoven fabric layer, and a second spunbond nonwoven fabric layer. Specifically, the composite nonwoven fabric may include a first spunbonded nonwoven fabric layer, a meltblown nonwoven fabric layer, and a second spunbonded nonwoven fabric layer that are each manufactured in a continuous process in one device and integrated with each other.

At least one of the first spunbond nonwoven fabric layer and the second spunbond nonwoven fabric layer may include the insect repellent masterbatch for nonwoven fabrics.

The meltblown nonwoven fabric layer may be at least partially charged.

Additionally, the meltblown nonwoven fabric layer may include an insect repellent. For example, the meltblown nonwoven fabric layer may include an insect repellent masterbatch for nonwoven fabrics.

The composite nonwoven fabric is characterized by having a fine particle collection function by including a meltblown nonwoven fabric layer that is at least partially charged. However, since conventional spunbond-meltblown multilayer nonwoven fabrics have average pores of several to tens of micrometers (㎛), they have little ability to remove fine particles of 0.1 to 0.6㎛.

In addition, the composite nonwoven fabric has a QF factor of 0.15 to 0.90, expressed by Equation 1 below:

[Equation 1]

QF factor = -ln (fine dust transmittance/pressure loss)

In the above formula, the symbol “ln” means natural logarithm.

For example, the QF factor may be 0.20 to 0.90, 0.25 to 0.90, 0.30 to 0.90, 0.35 to 0.90, 0.40 to 0.90, 0.50 to 0.90, 0.60 to 0.90, 0.70 to 0.90, or 0.8 to 0.90.

The higher the QF factor, the higher the filtration performance.

The composite nonwoven fabric may have a tensile strength in the MD direction of 0.1 to 0.3 kgf/5 cm/gsm, 0.15 to 0.3 kgf/5 cm/gsm, 0.20 to 0.3 kgf/5 cm/gsm, or 0.25 to 0.30 kgf/5 cm/gsm. Here, gsm is an abbreviation for g/m ² and means the weight per unit area of the composite nonwoven fabric.

Additionally, the composite nonwoven fabric may have a MD direction stiffness of 20 mm or more, 25 mm or more, 30 mm or more, or 35 mm or more.

Additionally, the composite nonwoven fabric may have a CD direction stiffness of 10 mm or more, 15 mm or more, 20 mm or more, 25 mm or more, or 30 mm or more.

In addition, the composite nonwoven fabric has a fine dust removal efficiency of 20 to 99.9%, 30 to 99.9%, 40 to 99.9%, 50 to 99.9%, 60 to 99.9%, 70 to 99.9%, 80 to 99.9%, or 90 to 99.9%. It can be.

In addition, the composite nonwoven fabric has a pressure loss of 0.80~12mmH ₂ O, 1.0~10mmH ₂ O, 1.5~8mmH ₂ O, 2.0~6mmH ₂ O, 2.5~7mmH ₂ O, 3.0~6mmH ₂ O, 3.5~5mmH ₂ O Or it may be 4.0~5mmH ₂ O.

The composite nonwoven fabric may include the first spunbond nonwoven fabric layer, the meltblown nonwoven fabric layer, and the second spunbond nonwoven fabric layer in this order. However, the present invention is not limited to this, and the composite nonwoven fabric may include the first spunbond nonwoven fabric layer, the meltblown nonwoven fabric layer, and the second spunbond nonwoven fabric layer in a different order.

The first spunbond nonwoven fabric layer and the second spunbond nonwoven fabric layer may each include a plurality of spunbond nonwoven fabric sublayers. Specifically, the first spunbonded nonwoven fabric layer and the second spunbonded nonwoven fabric layer may each include a plurality of spunbonded nonwoven fabric sublayers that are each manufactured in a continuous process in one device and integrated with each other.

The meltblown nonwoven fabric layer may include at least one charged meltblown nonwoven fabric sublayer. Specifically, the meltblown nonwoven fabric layer includes only one charged meltblown nonwoven fabric sublayer, or a plurality of charged meltblown nonwoven fabric sublayers each manufactured in a continuous process in one device and integrated with each other. may include.

The meltblown nonwoven fabric layer may further include at least one non-charged meltblown nonwoven fabric sublayer in addition to at least one charged meltblown nonwoven fabric sublayer. Specifically, the meltblown nonwoven fabric layer includes only one non-charged meltblown nonwoven fabric sublayer in addition to at least one charged meltblown nonwoven fabric sublayer, or is each manufactured in a continuous process in one device. It may further include a plurality of non-charged meltblown nonwoven fabric sub-layers integrated with each other.

At least one spunbond nonwoven fabric, at least one charged meltblown nonwoven fabric, and/or at least one uncharged meltblown nonwoven fabric included in the composite nonwoven fabric may each independently contain a non-conductive polymer. .

The non-conductive polymer may be the same as the non-conductive polymer included in the base resin of the insect repellent masterbatch for non-woven fabrics.

Each of the spunbond nonwoven fabrics, each charged meltblown nonwoven fabric, and/or each uncharged meltblown nonwoven fabric may further include additives independently of each other.

The additives include pigments, light stabilizers, primary antioxidants, secondary antioxidants, metal deactivators, hindered amines, hindered phenols, fatty acid metal salts, triester phosphites, phosphates, fluorine-containing compounds, nucleating agents (nucleant), or these. It may include a combination of .

Additionally, in one embodiment, antioxidants may function as charge increasers. Possible charge increasing agents include heat stable organic triazine compounds, oligomers or combinations thereof, wherein these compounds or oligomers further contain at least one nitrogen atom in addition to the nitrogen in the triazine ring.

For example, charge increasing agents for improving charging characteristics are disclosed in U.S. Patent Nos. 6,268,495, 5,976,208, 5,968,635, 5,919,847, and 5,908,598. For example, the charge increaser may include a hindered amine-based additive, a triazine additive, or a combination thereof.

As another example, the charge increasing agent is poly[((6-(1,1,3,3,-tetramethylbutyl)imino-1,3,5-triazine-2,4-diyl)((2 ,2,6,6,-tetramethyl-4-piperidyl)imino)hexamethylene ((2,2,6,6,-tetramethyl-4-piperidyl)imino)] (manufactured by BASF, CHIMASSORB 944), (1,6-hexanediamine,N,N'-bis(2,2,6,6-tetramethyl-4-with 2,4,6-trichloro-1,3,5-triazine) piperidinyl) -polymer, N-butyl-1-butanamine, reaction product with N-butyl-2,2,6,6-tetramethyl-4-piperidinamine) (manufactured by BASF, CHIMASSORB 2020) or It may include combinations of these.

The charge increasing agent is an N-substituted amino aromatic compound, especially a tri-amino substituted compound, such as 2,4,6-trianilino-p-(carbo-2'-ethylhexyl-1'-oxy)- It may be 1,3,5-triazine (UVINUL T-150 manufactured by BASF). Another charge increasing agent is 2,4,6-tris-(octadecylamino)-triazine, also known as tristearyl melamine (“TSM”).

The content of the charge increaser may be 0.25 to 5 parts by weight based on 100 parts by weight of each charged meltblown nonwoven fabric. If the content of the charge increaser is within the above range, not only can the high level of charging performance targeted by the present invention be obtained, but the spinnability is good, the strength of the nonwoven fabric is maintained high, and it is also advantageous in terms of cost.

In addition to the above additives, the composite nonwoven fabric may further include generally known additives such as heat stabilizers and weathering agents.

The total content of the charged meltblown nonwoven fabric in the composite nonwoven fabric may be 3 to 50 parts by weight based on 100 parts by weight of the total weight of the composite nonwoven fabric. If the total content of the charged meltblown nonwoven fabric is within the above range, a composite nonwoven fabric with excellent filtration performance, shape stability, and durability can be obtained.

The composite nonwoven fabric may have a basis weight (mass per unit area) of 10 to 500 g/m ² , for example, 20 to 100 g/m ² .

A plurality of nonwoven fabrics included in the composite nonwoven fabric may be integrated (i.e., combined) with each other by thermal fusion rather than ultrasonic fusion.

The composite nonwoven fabric may further include at least one additional layer.

As an example, each of the additional layers may include one or more separate nonwoven fabrics that are neither spunbond nor meltblown nonwoven.

As another example, each of the additional layers may include one or more layers made of a material other than non-woven fabric.

At least one of the first spunbonded nonwoven fabric layer and the second spunbonded nonwoven fabric layer includes the insect repellent masterbatch for nonwoven fabrics in an amount of 5 to 20% by weight based on the weight of each. If the content of the non-woven insect repellent masterbatch in each non-woven fabric is within the above range, the radioactivity, insect repellent effect, skin patch test grade, breathability performance, mechanical strength, and abrasion fluff evaluation grade are all excellent, and the colorimetric deviation (ΔE*) Nonwoven fabric with an appropriate level can be obtained.

In addition, the composite nonwoven fabric may have a bacteriostatic activity value of 5.0 or more for Staphylococci and a bacteriostatic activity value for pneumococci measured according to the bacteriostatic activity value measurement method (JIS L 1902) of 6.0 or more.

In addition, the composite nonwoven fabric has an insect repellent rate of more than 60% for adult mealworms one week after treatment, and can exhibit a sustained performance of more than 40% even two weeks after treatment.

Additionally, the composite nonwoven fabric may have a skin patch test grade of grade 1 or higher.

Additionally, the composite nonwoven fabric may have a colorimetric deviation (ΔE*) of 2.0 to 3.0. The colorimetric deviation (ΔE*) has effectiveness in terms of quality control. Specifically, qualitative and quantitative analysis can be performed to check whether the insect repellent content is appropriate, but this is time-consuming and cost-inefficient, and this can be easily solved by measuring colorimetric deviation (ΔE*). In other words, if the color difference (ΔE*) of the composite nonwoven fabric is 2.0 to 3.0, it is evidence that the insect repellent content is appropriate. In addition, if the color difference (ΔE*) of the composite nonwoven fabric is 2.0 to 3.0, it appears slightly brown, but the color difference (ΔE*) of organic cotton and natural pulp is at the level of 2.0, giving consumers an organic feeling. There is also the advantage of appealing to .

In addition, the composite nonwoven fabric can exhibit breathability performance of 300 to 700 cm ³ /cm ² /s.

The composite nonwoven fabric has a maximum breaking strength of 40~60N/5cm, at which time the breaking elongation is 40~80%, and the abrasion fluff evaluation grade may be grade 1 or 2.

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

A method of manufacturing a composite nonwoven fabric according to an embodiment of the present invention includes the step of continuously forming a spunbond nonwoven fabric layer (S100) and the step of continuously forming a meltblown nonwoven fabric layer on the spunbond nonwoven fabric layer (S200). do.

The spunbond nonwoven fabric layer continuous forming step (S100) involves forming fiber yarns by melt-extruding, cooling, and stretching a mixture of a thermoplastic non-conductive polymer and the above-described insect repellent masterbatch for nonwoven fabrics, and then placing the fiber yarns on a screen belt. It may be web forming by stacking.

In the meltblown nonwoven layer continuous forming step (S200), a thermoplastic non-conductive polymer (charging performance improver can be added) is melt-extruded, hot-air stretched, and cooled to form a fiber yarn, and then the fiber yarn is added to the spunbond nonwoven fabric layer. In the continuous forming step (S100), the web may be formed by laminating it on the web-formed spunbond.

Specifically, the meltblown nonwoven layer continuous forming step (S200) is a step of continuously forming free fibers with a non-conductive polymer (or a combination of a non-conductive polymer and the above-described insect repellent masterbatch for nonwoven fabrics) (S200-1), Continuously spinning the free fibers (S200-2), continuously spraying a polar solvent (for example, water) on the free fibers to continuously charge the free fibers (S200-3), and It may include a step (S200-4) of continuously forming a meltblown nonwoven fabric by continuously integrating free fibers.

The free fiber continuous charging treatment step (S200-3) may be performed by continuously spraying the polar solvent together with gas (eg, air).

Hereinafter, it will be described in detail that the free fiber continuous charging treatment step (S200-3) has a different or significant effect compared to the prior art.

(1) Generally, methods that can be used for charging during the meltblown process include charging through friction between a polar solvent and the melt-spinning filament as shown in U.S. Patent No. 6,375,886, and charging as shown in U.S. Patent No. 6,969,484. A method of immersing a meltblown nonwoven fabric in a polar solvent, allowing water to pass through the nonwoven fabric using a suction device, and then charging through friction between the water and the nonwoven fabric is mainly applied in the industry to produce a charged meltblown nonwoven fabric. . In this way, the charging method using a polar solvent requires a separate post-process of drying the polar solvent after the charging treatment, and therefore, it is fundamentally impossible to laminate or composite nonwoven fabrics in a continuous process. U.S. Patent No. 6,375,886 and U.S. Patent No. 6,969,484 are hereby incorporated by reference in their entirety.

(2) U.S. Patent No. 5,227,172 describes a method of applying a high potential difference between a meltblown die and a collector to cause the melt-spun resin to filament and be inductively charged by the surrounding electric field. Disclosed is that this method can obtain a charged meltblown nonwoven fabric without separate post-processing. However, the non-woven fabric treated with induction charging by potential difference shows a phenomenon in which the charging efficiency decreases rapidly depending on heat or the surrounding environment, so it requires long-term storage during the sales process, such as a fine dust removal mask, or is used as an air purifier filter. Likewise, it has the disadvantage of being difficult to apply in applications where long-term service life must be guaranteed. U.S. Patent No. 5,227,172 is hereby incorporated by reference in its entirety.

The present inventors sprayed a polar solvent in the form of a double fluid with air on the meltblown nonwoven fabric layer, allowing polar solvent particles with sufficient kinetic energy to rub against the filament being melt-spun with a small spray amount to achieve a highly efficient triboelectric effect. A charging treatment device has been developed to enable charging, and the characteristic of this charging processing device is that it does not require separate drying equipment because it is sufficiently heated and evaporated by heated air within the DCD (Die to collector distance) section due to the small spray amount. Due to these characteristics, the charging treatment device has the characteristic of being able to composite non-woven fabrics through continuous lamination in combination with the non-woven fabric manufacturing process.

The nonwoven fabric obtained by electrifying the meltblown nonwoven fabric is continuously polarized so that negative and positive charges exist semipermanently, and such nonwoven fabric is called an electret nonwoven fabric.

As described above, the method of manufacturing the composite nonwoven fabric may not include a separate drying step to remove the polar solvent sprayed in the free fiber continuous charging treatment step (S200-3).

In addition, as described above, the polar solvent continuously sprayed in the free fiber continuous charging treatment step (S200-3) is continuously heated by heated air within the DCD (Die to collector distance) section of the composite nonwoven fabric manufacturing device. may evaporate.

The method of manufacturing the composite nonwoven fabric may further include the step of continuously forming another spunbond nonwoven fabric layer on the meltblown nonwoven fabric layer in the same manner as the continuous forming step of the spunbond nonwoven fabric layer (S100) (S300). .

The method of manufacturing the composite nonwoven fabric includes forming each spunbond on one or both sides of the meltblown nonwoven fabric layer after the continuous forming step of the meltblown nonwoven fabric layer (S200) or the step of continuously forming another spunbond nonwoven fabric layer (S300). A step (S40) of continuously thermally compressing the nonwoven fabric layer may be further included.

Figure 1 is a diagram schematically showing a composite nonwoven fabric 10 according to an embodiment of the present invention.

The composite nonwoven fabric 10 according to one embodiment of the present invention includes a first spunbond nonwoven fabric layer 11, a meltblown nonwoven fabric layer 12, and a second spunbond nonwoven fabric layer 13.

Additionally, composite nonwoven fabrics having various structures and/or configurations can be manufactured by modifying the manufacturing method of the composite nonwoven fabric.

Another aspect of the present invention provides an article comprising the composite nonwoven fabric.

The article may be a health or medical article.

Hereinafter, the present invention will be described in more detail through examples. These examples are intended to illustrate the present invention in more detail, and the scope of the present invention is not limited to these examples.

Examples 1-1 to 1-3 and Comparative Examples 1-1 to 1-4: Preparation of insect repellent masterbatch

As the base resin, propylene homopolymer (LG Chemical, H7700) with a melt index (MI) of 34g/10min is used, and as liquid insect repellent, cinnamaldehyde, α-copaene, apiol, and oleic acid are used. It was mixed at a ratio of 20:8:7:9 by weight, and an insect repellent masterbatch was prepared by melt-mixing using silica as a carrier material. In Examples 1-1 to 1-3 and Comparative Examples 1-1 to 1-4, the content of the liquid insect repellent (by weight) and the content of the carrier material (by weight) in the raw materials consisting of the base resin, the liquid insect repellent and the carrier material. are shown in Table 1 below.

Example Comparative example 1-1 1-2 1-3 1-1 1-2 1-3 1-4 Content of liquid insect repellent (ppm) 9,000 10,000 11,000 9,000 8,000 11,000 12,000 Carrier content (ppm) 30,000 40,000 50,000 20,000 30,000 60,000 50,000

In addition, the content of the insect repellent ingredient (by weight) and the content of the carrier material (by weight) in the insect repellent master batches prepared in Examples 1-1 to 1-3 and Comparative Examples 1-1 to 1-4 are shown in Table 2 below. Each is shown.

Example Comparative example 1-1 1-2 1-3 1-1 1-2 1-3 1-4 Content of insect repellent ingredients (ppm) 300 400 500 300 200 500 600 Carrier content (ppm) 30,000 40,000 50,000 20,000 30,000 60,000 50,000

Examples 2-1 to 2-5 and Comparative Examples 2-1 to 2-6: Production of composite nonwoven fabric

As the polymer for forming the spunbond nonwoven layer (SB), propylene homopolymer (LG Chemical, H7700) with a melt index (MI) of 34 g/10 min was used, and as the polymer for forming the meltblown nonwoven layer (MB), melt flow was used. A resin (LG Chemical, H7910) with an index (MFR) of 1000 g/10 min was used. In addition, the polymer for forming the spunbond nonwoven layer (SB) includes any one of the insect repellent masterbatches prepared in Examples 1-1 to 1-3 and Comparative Examples 1-1 to 1-4 based on its total weight. It was added according to the ratio in Table 3. In addition, Chimassorb 944, a hindered amine light stabilizer, was added to the polymer for forming the meltblown nonwoven layer (MB) at an amount of 0.5 wt%. Afterwards, a spunbond-meltblown-spunbond (SMS) type composite nonwoven fabric was continuously manufactured using the composite nonwoven fabric manufacturing apparatus as shown in Figure 1. Specifically, the meltblown nonwoven fabric layer (MB) is continuously charged by contacting water with air through a two-fluid nozzle in the composite nonwoven fabric manufacturing apparatus, and then laminated on the top of the spunbond nonwoven fabric layer (SB), Another spunbond nonwoven fabric layer (SB) is laminated on top of the meltblown nonwoven fabric layer (MB). As a result, an SMS nonwoven laminate was obtained. Thereafter, the SMS nonwoven fabric laminate was manufactured in the form of a single composite nonwoven fabric through a heat compression process between a roll on which an embossed pattern was formed and a roll without irregularities. Here, the total basis weight of the SMS composite nonwoven fabric was adjusted to 100gsm (g/m ² ), and the basis weight of the meltblown nonwoven layer (MB) was adjusted to 22gsm.

Insect repellent masterbatch used Example Comparative example 2-1 2-2 2-3 2-1 2-2 2-3 2-4 2-5 2-6 type Example 1-1 Example 1-2 Example 1-3 Comparative Example 1-1 Comparative Example 1-2 Comparative Example 1-3 Comparative Example 1-4 Example 1-1 Example 1-3 Added amount
(weight%) 20 13 5 20 20 5 5 25 One

Evaluation Example 1: Evaluation of dispersion index of insect repellent masterbatch

The dispersion index of the insect repellent masterbatch prepared in Examples 1-1 to 1-3 and Comparative Examples 1-1 to 1-4 was evaluated, and the results are shown in Table 4 below.

Example Comparative example 1-1 1-2 1-3 1-1 1-2 1-3 1-4 dispersion index 0.80 0.90 0.95 0.50 0.95 0.40 0.45

Evaluation Example 2: Evaluation of physical properties of composite nonwoven fabric

The physical properties of the composite nonwoven fabrics prepared in Examples 2-1 to 2-5 and Comparative Examples 2-1 to 2-6 were evaluated by the following method, and the results are shown in Table 5 below.

(1) Radioactivity: Observe whether the nonwoven web was broken, and if it was not broken, it was recorded as “good.”

(2) Bacteriostatic activity value: The bacteriostatic activity measurement method involves inoculating bacteria (i.e., staphylococcus or pneumococcus) (i.e., allowing the test sample to completely absorb the test bacterial solution) and culturing for 18 hours to determine the number of bacteria before and after incubation. Here's how to check. The bacteriostatic activity value is measured in the following manner: that is, when the number of bacteria after culturing of the unprocessed control group is C, and the number of bacteria after culturing the insect repellent treated product is B, the bacteriostatic activity value is calculated according to Equation 2 below. . Here, the unprocessed control and the processed product are identical to each other in that they have a composition including three layers of a first spunbond nonwoven fabric layer, a meltblown nonwoven fabric layer, and a second spunbond nonwoven fabric layer in this order, and the unprocessed control is They are different in that the processed products are treated to repel insects, while the processed products are not treated to repel insects.

[Equation 2]

Bacteriostatic activity value = Log(C/B)

(3) Insect evasion rate and sustained performance of adult mealworms: The insect repellent evasion rate of adult mealworms is expressed as a percentage (%) of the number of surviving mealworms in the processed product relative to the number of surviving mealworms in the unprocessed control group. Indicates the repellent performance of processed products. Here, the unprocessed control and the processed product are identical to each other in that they have a composition including three layers of a first spunbond nonwoven fabric layer, a meltblown nonwoven fabric layer, and a second spunbond nonwoven fabric layer in this order, and the unprocessed control is They are different in that the processed products are treated to repel insects, while the processed products are not treated to repel insects. The insect repellent evasion rate of the adult mealworms is measured in the following way: First, put adult mealworm medium in petri dish (large) 1, pile petri dish (small) 1 in the center, and fill petri dish (small) 1 with unprocessed control and Place bait for bait. Afterwards, put mealworm adult medium in Chalet (large) 2, pile Chalet (small) 2 in the center, and place processed insect repellent products and bait feed in Chalet (small) 2. Afterwards, place them in an airtight container, and after 24 hours, take out Chalet (small) 1 and Shalet (small) 2 and check the number of surviving mites in each. Finally, the insect repellent evasion rate of adult mealworms is calculated according to Equation 3 below.

[Equation 3]

Insect evasion rate of adult mealworms (%) = (Number of mealworms in Chalet (small) 1 - Number of mealworms in Chalet (small) 2) / Number of mealworms in Chalet (small) 1 × 100

In Equation 3 above, surviving mealworms refer to adult mealworms that show a response to stimulation from the outside.

(3) Skin patch test grade: The skin test measurement method is as follows:

① Sample preparation: 5cm x 5cm size per sample

② Attach the sample between the human wrist and elbow and aging it for 24 hours

③ Remove the sample after 24 hours and check for changes in the skin.

- Grade 1: Same as initial skin

- Grade 2: Slight blushing

- Grade 3: More than half of the body is flushed.

- Grade 4: Redness in all areas

(4) Colorimeter deviation (ΔE ^* ): The skin test measurement method is as follows: The colorimeter deviation (ΔE ^* ) of the composite nonwoven fabric was measured using a colorimeter (CM3700D, Minolta).

(5) Air permeability performance: Using the FX3300 air permeability meter, the air permeability (ventilation rate) was measured under the measurement area and pressure after installing the sample in the KSK 0507 method.

(6) Breaking strength and elongation at break: Using a tensile strength tester (Instron) measuring equipment, a test piece with a width of 5 cm was stretched according to the KSK 0520 method under the conditions of a spacing between grips of 10 cm and a tensile speed of 500 mm/min to measure the breaking strength. and elongation at break were measured.

(7) Abrasion fluff: fluff was measured by rubbing a 15cm piece several times using the KSK 0504 method using a Martindale 404 measuring device.

Example Comparative example 2-1 2-2 2-3 2-1 2-2 2-3 2-4 2-5 2-6 radioactive Good Good Good radiation
Impossible Good radiation
Impossible radiation
Impossible Good Good Bacteriostatic activity value of Staphylococcus aureus 6.0 5.7 5.2 measurement
Impossible 2.0 measurement
Impossible measurement
Impossible 1.5 2.0 Bacteriostatic activity value of pneumococcus 6.8 6.4 6.1 Not measurable 1.5 measurement
Impossible measurement
Impossible 1.6 1.8 Insect repellent evasion rate of adult mealworms (1 week after treatment) 75% 70% 65% Not measurable 25% measurement
Impossible measurement
Impossible 20% 15% Insect repellent evasion rate of adult mealworms (2 weeks after treatment) 55% 48% 42% Not measurable 30% measurement
Impossible measurement
Impossible 25% 20% Skin patch test grade 1st grade 1st grade 1st grade Not measurable 1st grade measurement
Impossible measurement
Impossible 1st grade 1st grade Colorimetric deviation (ΔE ^* ) 2.8 2.4 2.2 Not measurable 1.5 measurement
Impossible measurement
Impossible 3.5 1.5 Breathability performance (cm ³ /cm ² /s) 350 420 410 Not measurable 450 measurement
Impossible measurement
Impossible 430 450 Maximum breaking strength (N/5cm) 55 60 57 measurement
Impossible 55 measurement
Impossible measurement
Impossible 62 60 Elongation at break (%) 50 55 53 measurement
Impossible 60 measurement
Impossible measurement
Impossible 55 57 Abrasion fluff evaluation 1st grade 1st grade 1st grade Not measurable 1st grade measurement
Impossible measurement
Impossible 1st grade 1st grade

Referring to Table 5, the composite nonwoven fabrics prepared in Examples 2-1 to 2-3 are excellent in radioactivity, insect repellent effect, skin patch test grade, breathability performance, mechanical strength, and abrasion fluff evaluation grade, and have excellent colorimetric deviation ( ΔE ^* ) was found to be at an appropriate level.

However, in Comparative Examples 2-1, 2-3, and 2-4, nonwoven fabric could not be manufactured because spinning itself was impossible.

In addition, the composite nonwoven fabrics prepared in Comparative Examples 2-2, 2-5, and 2-6 were found to have poor insect repellent effect. In particular, the composite nonwoven fabric manufactured in Comparative Example 2-5 cannot appeal an organic feeling to consumers because the color difference (ΔE ^* ) is outside the appropriate level.

The present invention has been described with reference to the drawings and examples, but these are merely illustrative, and those skilled in the art will understand that various modifications and equivalent implementations can be made therefrom. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

10: Composite nonwoven fabric 11: First spunbond nonwoven fabric layer
12: Meltblown nonwoven layer 13: Second spunbond nonwoven layer

Claims (19)

It includes a first spunbond nonwoven fabric layer, a meltblown nonwoven fabric layer, and a second spunbond nonwoven fabric layer,
At least one of the first spunbonded nonwoven fabric layer and the second spunbonded nonwoven fabric layer includes an insect repellent masterbatch for nonwoven fabrics,
The meltblown nonwoven fabric layer is at least partially charged,
The insect repellent masterbatch for non-woven fabrics includes a base resin, an insect repellent ingredient, and a carrier material. In the insect repellent masterbatch for non-woven fabrics, the content of the insect repellent ingredient is 300 to 500 ppm by weight, and the content of the carrier material is 30,000 ppm by weight. ~50,000 ppm,
A composite nonwoven fabric in which at least one of the first spunbonded nonwoven fabric layer and the second spunbonded nonwoven fabric layer includes the insect repellent masterbatch for nonwoven fabrics in an amount of 5 to 20% by weight based on the weight of each. According to paragraph 1,
The base resin is a composite nonwoven fabric comprising a non-conductive polymer selected from polyolefin, polystyrene, polycarbonate, polyester, polyamide, copolymers thereof, or combinations thereof. According to paragraph 1,
The insect repellent component is a composite nonwoven fabric containing cinnamaldehyde, α-copaene, apiol, oleic acid, or a combination thereof. According to paragraph 1,
The carrier material is a composite nonwoven fabric comprising silica, zeolite, kaolin, or a combination thereof. According to paragraph 1,
The insect repellent masterbatch for non-woven fabrics is a composite non-woven fabric with a dispersion index of 0.6 or more and less than 1.0. According to paragraph 1,
The composite nonwoven fabric includes the first spunbond nonwoven fabric layer, the meltblown nonwoven fabric layer, and the second spunbond nonwoven fabric layer in this order. According to clause 6,
The first spunbonded nonwoven fabric layer and the second spunbonded nonwoven fabric layer each include a plurality of spunbonded nonwoven fabric sublayers. According to paragraph 1,
The meltblown nonwoven fabric layer is a composite nonwoven fabric containing an insect repellent. According to paragraph 1,
The meltblown nonwoven fabric layer is a composite nonwoven fabric further comprising at least one non-charged meltblown nonwoven fabric sublayer in addition to at least one charged meltblown nonwoven fabric sublayer. According to paragraph 1,
Composite nonwoven fabric further comprising at least one additional layer. delete According to paragraph 1,
The composite nonwoven fabric has a bacteriostatic activity value of Staphylococcus aureus of 5.0 or more and a pneumococcus bacteriostatic activity value of 6.0 or more as measured according to the bacteriostatic activity value measurement method (JIS L 1902). According to paragraph 1,
The composite nonwoven fabric has an insect repellent evasion rate of adult mealworms of more than 60% one week after treatment, and exhibits a continuous performance of more than 40% even two weeks after treatment. According to paragraph 1,
The composite nonwoven fabric is a composite nonwoven fabric with a skin patch test grade of 1 or higher. According to paragraph 1,
The composite nonwoven fabric is a composite nonwoven fabric with a color difference deviation (ΔE ^* ) of 2.0 to 3.0. According to paragraph 1,
The composite nonwoven fabric is a composite nonwoven fabric that exhibits breathability performance of 300 to 700 cm ³ /cm ² /s. According to paragraph 1,
The composite nonwoven fabric has a maximum breaking strength of 40~60N/5cm, an elongation at break of 40~80%, and an abrasion fluff evaluation grade of 1st or 2nd grade. An article comprising the composite nonwoven fabric according to any one of claims 1 to 10 and 12 to 17. According to clause 18,
The above goods are health or medical goods.