JP2024511334A - Method for producing insect repellent masterbatch for nonwoven fabric, insect repellent masterbatch for nonwoven fabric, nonwoven fabric and articles thereof - Google Patents

Abstract

A method for producing an insect repellent masterbatch for nonwoven fabrics, an insect repellent masterbatch for nonwoven fabrics, a nonwoven fabric, and an article thereof, the method for producing an insect repellent masterbatch for nonwoven fabrics includes mixing raw materials containing a base resin, a liquid insect repellent, and a carrier substance. and the content of the liquid insect repellent in the raw material is 9,000 to 11,000 ppm on a weight basis, and the content of the carrier substance in the raw material is 30,000 ppm on a weight basis. ~50,000ppm.

Description

The present invention relates to a method for producing an insect repellent masterbatch for nonwoven fabrics, an insect repellent masterbatch for nonwoven fabrics, a nonwoven fabric, and articles thereof, and more particularly, the present invention relates to insect repellent and insect proliferation control by containing an insect repellent that is harmless to the human body. A method for producing an insect repellent masterbatch for nonwoven fabric, which has improved antibacterial properties as well as antibacterial properties, and can produce nonwoven fabrics for various uses such as hygiene, bedding, and agriculture. Regarding goods.

Conventional non-woven fabrics have a satisfactory level of mechanical strength and ability to remove fine dust, but they do not have insect repellent functionality or antibacterial properties, and have the problem of attracting pests and being contaminated by bacteria during storage. In some cases, there was a problem that it irritated the skin.

One embodiment of the present invention provides a method for manufacturing an insect repellent masterbatch for nonwoven fabric.

Another embodiment of the present invention provides an insect repellent masterbatch for nonwoven fabric manufactured by the method for manufacturing an insect repellent masterbatch for nonwoven fabric.

Still another embodiment of the present invention provides a nonwoven fabric including the insect repellent masterbatch for nonwoven fabric.

Yet another embodiment of the present invention provides an article including the nonwoven fabric.

One aspect of the present invention is
mixing raw materials including a base resin, a liquid insect repellent and a carrier material to obtain a raw material mixture;
In the raw material, the content of the liquid insect repellent is 9,000 to 11,000 ppm on a weight basis,
The present invention provides a method for producing an insect repellent masterbatch for nonwoven fabric, wherein the content of the carrier material in the raw material is 30,000 to 50,000 ppm on a weight basis.

The base resin may also include a non-conductive polymer selected from polyolefins, polystyrene, polycarbonates, polyesters, polyamides, copolymers thereof, or combinations thereof.

The insect repellent may also include cinnamaldehyde, α-copaene, apiol, oleic acid, or combinations thereof.

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

Other aspects of the invention include:
An insect repellent masterbatch for nonwoven fabric manufactured by the method for manufacturing an insect repellent masterbatch for nonwoven fabric is provided.

Yet another aspect of the present invention is
Contains a base resin, an insect repellent component and a carrier substance,
The content of the insect repellent component is 300 to 500 ppm on a weight basis,
The content of the carrier material is 30,000 to 50,000 ppm by weight to provide an insect repellent masterbatch for nonwoven fabric.

The insect repellent masterbatch for nonwoven fabric also has a dispersion index of 0.6 or more and less than 1.0.

Yet another aspect of the present invention is
A nonwoven fabric containing the insect repellent masterbatch for nonwoven fabric is provided.

The nonwoven fabric may also contain the insect repellent masterbatch for nonwoven fabric in a proportion of 5 to 20% by weight based on the total weight of the nonwoven fabric.

The nonwoven fabric has a bacteriostatic activity value of 5.0 or more for staphylococci and a bacteriostatic activity value of 6.0 or more for pneumococci, as measured by a bacteriostatic activity measurement method (JIS L 1902).

The non-woven fabric has an insect repellency rate of 60% or more for adult shorthorn beetles one week after treatment, and can exhibit a sustained performance of 40% or more even two weeks after treatment.

The nonwoven fabric also has a skin patch test grade of grade 1 or higher.

The nonwoven fabric also has a color difference meter deviation (ΔE*) of 2.0 to 3.0.

The nonwoven fabric can exhibit air permeability of 300 to 700 cm ³ /cm ² /s.

Yet another aspect of the present invention is
An article including the nonwoven fabric is provided.

The article may also be a health or medical article.

The insect repellent master batch for non-woven fabric manufactured by the method for manufacturing an insect repellent master batch for non-woven fabric according to an embodiment of the present invention contains an insect repellent that is harmless to the human body, and has the effect of repelling insects and suppressing the proliferation of insects, as well as being antibacterial. It also has improved properties and can be applied to non-woven fabrics for various uses such as hygiene, bedding and agriculture.

1 is a diagram schematically illustrating a composite nonwoven fabric including a nonwoven fabric according to an embodiment of the present invention; FIG. 1 is a diagram schematically illustrating a composite nonwoven fabric manufacturing apparatus used to continuously manufacture a composite nonwoven fabric including a nonwoven fabric according to an embodiment of the present invention; FIG.

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

As used herein, "liquid insect repellent" means an insect repellent in the form of a solution, oil, or suspension.

Furthermore, in this specification, the term "dispersion index" refers to the value obtained by dividing the discharge amount by the input amount when an insect repellent masterbatch for nonwoven fabric is spun through a spinning nozzle. .

In addition, in this specification, "non-woven fabric composite" refers to a non-woven fabric laminate produced by separately producing two or more types of non-woven fabrics and then going through a separate post-lamination process. It refers to a nonwoven fabric in which two or more types of nonwoven fabrics are manufactured and integrated through continuous processes in one device, rather than a body. Therefore, in this specification, "composite non-woven fabric" is also referred to as "monolithic non-woven fabric". The composite nonwoven fabric has stronger interlayer bonding than the nonwoven fabric laminate, and has excellent shape stability and filtration performance.

Further, in this specification, the "electrostatically charged meltblown nonwoven fabric layer" or the "electrostatically charged meltblown nonwoven fabric sublayer" is also produced by a continuous process. Specifically, the "electrostatically charged meltblown nonwoven fabric layer" or the "electrostatically charged meltblown nonwoven fabric sublayer" is produced by performing "manufacturing of the meltblown nonwoven fabric" and "charging treatment" sequentially or simultaneously in a continuous process. It is also something that is manufactured by doing.

In addition, in this specification, "charged" means a state in which an electric charge is semi-permanently imparted to the nonwoven fibers and an electrostatic field can be formed between adjacent fibers. Nonwoven fabrics are characterized by higher charge density and fine dust removal efficiency than nonwoven fabrics that have not been subjected to charging treatment.

In this specification, "tensile strength" refers to the condition that a 5 cm wide test piece (grip spacing at the time of evaluation is 10 cm) is subjected to a tensile strength elongation tester (Instron) based on KSK 0520 at a tensile speed of 500 mm/min. The tensile strength in the MD direction (mechanical direction) was measured.

In addition, in this specification, "bending resistance" is based on the measurement standard WSP 90.1, collecting 16 samples (25 mm x 150 mm) in the MD and CD directions, placing the samples on a bending resistance measuring device, The specimen was pushed in the direction of the slope until it touched the slope, and the sample length from the point of bending to the point where it touched the slope was measured in mm.

In addition, in this specification, "fine dust transmittance", "fine dust removal efficiency", and "pressure loss" were evaluated for the composite nonwoven fabric by the following method after production and before use:
(1) Measuring device: TSI-8130 model manufactured by TSI was used.
(2) Formation of aerosol: The measuring device evaporated the water in the aqueous sodium chloride solution mist generated by the fine aerosol generator to form a sodium chloride aerosol dispersed in the air. In the formed sodium chloride aerosol, the average particle size of the sodium chloride particles is 0.3 μm, and the sodium chloride concentration in the aerosol is 18.5 mg/m ³ .
(3) Fine dust transmittance evaluation: The permeation 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 fine dust transmittance.
(4) Evaluation of aerosol removal efficiency: The surface velocity of aerosol permeation 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 surface velocity of the aerosol was 16 cm/sec, and the evaluated area of the nonwoven fabric was 100 cm ² .

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

In the raw material, the content of the liquid insect repellent is 9,000 to 11,000 ppm on a weight basis, and in the raw material, the content of the carrier substance is 30,000 to 50,000 ppm on a weight basis. .

If the content of the liquid insect repellent and the content of the carrier material are each within the above ranges, an insect repellent masterbatch for nonwoven fabric having 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 are outside the above ranges, an insect repellent masterbatch for nonwoven fabric that is inferior in at least one of insect repellent performance and dispersion index will be obtained. .

The base resin may also include a non-conductive polymer selected from polyolefins, polystyrene, polycarbonates, polyesters, polyamides, copolymers thereof, or combinations thereof.

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

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

The liquid insect repellent is also 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 also include cinnamaldehyde, α-copaene, apiol, oleic acid, or combinations thereof.

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

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

In addition, the method for producing the insect repellent masterbatch for nonwoven fabrics further includes a step (S20) of extruding and pelletizing the raw material mixture after the step (S10).

Another aspect of the present invention provides an insect repellent masterbatch for nonwoven fabric manufactured by the method for manufacturing an insect repellent masterbatch for nonwoven fabric.

Yet another aspect of the present invention comprises a base resin, an insect repellent component, and a carrier material, the content of the insect repellent component is 300 to 500 ppm on a weight basis, and the content of the carrier material is on a weight basis, An insect repellent masterbatch for nonwoven fabrics having a concentration of 30,000 to 50,000 ppm is provided. If the content of the insect repellent component and the content of the carrier material are each within the above ranges, it is possible to obtain an insect repellent masterbatch for nonwoven fabrics having excellent insect repellent performance and dispersion index. If at least one of the content of the insect repellent component and the content of the carrier substance are out of the above ranges, an insect repellent masterbatch for nonwoven fabric that is inferior in at least one of insect repellent performance and dispersion index will be obtained. .

The insect repellent component is also the residue of the liquid insect repellent described above.

Further, the insect repellent masterbatch for nonwoven fabric has a dispersion index of 0.6 or more and less than 1.0. If the dispersion index of the insect repellent masterbatch for nonwoven fabric is less than 0.6, when attempting to produce a nonwoven fabric by adding the insect repellent masterbatch for nonwoven fabric, spinning becomes impossible due to the pressure increase in the extruder and die. Therefore, it becomes impossible to use the insect repellent masterbatch for nonwoven fabrics. Furthermore, if the insect repellent masterbatch for nonwoven fabric does not contain the carrier material, its dispersion index will be 1.0, and if it contains even a small amount, its dispersion index will be less than 1.0.

Another embodiment of the present invention provides a nonwoven fabric including the insect repellent masterbatch for nonwoven fabric.

The nonwoven fabric may also contain the insect repellent masterbatch for nonwoven fabric in a proportion of 5 to 20% by weight based on the total weight of the nonwoven fabric. In the nonwoven fabric, if the content of the insect repellent masterbatch for nonwoven fabric is within the above range, there will be no improvement in spinnability, insect repellent effect, skin patch test grade, air permeability performance, mechanical strength, and abrasion and fuzz evaluation grade. A nonwoven fabric having a color difference meter deviation (ΔE*) at an appropriate level can be obtained.

In addition, the nonwoven fabric has a bacteriostatic activity value of 5.0 or more for staphylococci and a bacteriostatic activity value of 6.0 or more for pneumococci as measured by the bacteriostatic activity measurement method (JIS L 1902). be.

In addition, the nonwoven fabric has an insect repellency rate of 60% or more for adult shorthorn beetles one week after treatment, and can exhibit a sustained performance of 40% or more even two weeks after treatment.

Further, the nonwoven fabric has a skin patch test grade of grade 1 or higher.

Further, the nonwoven fabric also has a color difference meter deviation (ΔE*) of 2.0 to 3.0. The color difference meter deviation (ΔE*) is effective in terms of quality control. Specifically, in order to confirm whether the insect repellent content is appropriate, qualitative and quantitative analyzes can be carried out, but this is inefficient in terms of time and cost; This can be easily solved by measuring the deviation (ΔE*). That is, if the color difference meter deviation (ΔE*) of the nonwoven fabric is 2.0 to 3.0, it is proof that the insect repellent content is appropriate. In addition, if the nonwoven fabric has a color difference deviation (ΔE*) of 2.0 to 3.0, it will exhibit a slight brown color, but the color difference difference (ΔE*) of organic cotton and natural pulp *) is at the 2.0 level, which has the advantage of being able to appeal to consumers the sense of organic farming.

Further, the nonwoven fabric can exhibit air permeability of 300 to 700 cm ³ /cm ² /s.

The nonwoven fabric has a maximum breaking strength of 40 to 60 N/5 cm, a breaking elongation of 40 to 80%, and an abrasion and fuzz evaluation grade of 1st or 2nd grade.

Two or more nonwoven fabrics may be laminated and integrated, or one or more nonwoven fabrics of a different type may be laminated and integrated to form a composite nonwoven fabric.

The composite nonwoven fabric has an insect repellent function and an antibacterial function.

The composite nonwoven fabric also includes a first spunbond nonwoven fabric layer, a meltblown nonwoven fabric layer, and a second spunbond nonwoven fabric layer. Specifically, the composite nonwoven fabric also includes a first spunbond nonwoven layer, a meltblown nonwoven fabric layer, and a second spunbond nonwoven fabric layer, each of which is manufactured in a continuous process using one device and integrated with each other. .

At least one of the first spunbond nonwoven fabric layer and the second spunbond nonwoven fabric layer also contains the insect repellent masterbatch for nonwoven fabric.

The meltblown nonwoven layer is also at least partially electrically charged.

Moreover, the melt-blown nonwoven fabric layer also contains an insect repellent. For example, the melt-blown nonwoven fabric layer may also include the insect repellent masterbatch for nonwoven fabrics.

The composite nonwoven fabric is characterized in that it has a fine particle collection function by including a meltblown nonwoven fabric layer that has been at least partially charged. However, conventional spunbond/meltblown multilayer nonwoven fabrics have average pores on the order of several to several tens of μm, and therefore have almost no ability to remove fine particles on the 0.1 to 0.6 μm level.

Further, the composite nonwoven fabric has a QF factor of 0.15 to 0.90 as expressed by the following formula 1:

[Formula 1]
QF factor=-ln (fine dust transmittance/pressure loss)

In Equation 1, the symbol "ln" means a natural logarithm.

For example, the QF factor is 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 ~0.90, 0.60-0.90, 0.70-0.90 or even 0.8-0.90.

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

The composite nonwoven fabric has a MD direction tensile strength 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 0.3 kgf/5 cm/gsm. It is also 0.30kgf/5cm/gsm. Here, gsm is an abbreviation for g/m ² and means the weight per unit area of the composite nonwoven fabric.

Further, the composite nonwoven fabric has a bending resistance in the MD direction of 20 mm or more, 25 mm or more, 30 mm or more, or 35 mm or more.

Further, the composite nonwoven fabric has a bending resistance in the CD direction of 10 mm or more, 15 mm or more, 20 mm or more, 25 mm or more, or 30 mm or more.

Further, 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%, and 70 to 99.9%. Also 99.9%, 80-99.9% or 90-99.9%.

In addition, the composite nonwoven fabric has a pressure loss of 0.80 to 12 mm H ₂ O, 1.0 to 10 mm H ₂ O, 1.5 to 8 mm H ₂ O, 2.0 to 6 mm H ₂ O, and 2.5 to 7 mm H ₂ O. , 3.0-6 mm H ₂ O, 3.5-5 mm H ₂ O or 4.0-5 mm H ₂ O.

The composite nonwoven fabric may also include the first spunbond nonwoven fabric layer, the meltblown nonwoven fabric layer, and the second spunbond nonwoven fabric layer in that order. However, the present invention is not limited thereto, 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 other orders.

The first spunbond nonwoven fabric layer and the second spunbond nonwoven fabric layer each include a plurality of spunbond nonwoven sublayers. Specifically, the first spunbond nonwoven fabric layer and the second spunbond nonwoven fabric layer each include a plurality of spunbond nonwoven fabric sublayers that are each manufactured by a continuous process in one apparatus and are integrated with each other. There is also.

The meltblown nonwoven fabric layer also includes at least one electrostatically charged meltblown nonwoven sublayer. In particular, the meltblown nonwoven layer may include only one electrostatically charged meltblown nonwoven sublayer, or may include a plurality of electrostatically treated meltblown nonwoven fabric layers, each fabricated by a sequential process and integrated with each other in one apparatus. It may also include a meltblown nonwoven sublayer.

In addition to the at least one electrically charged meltblown nonwoven fabric sublayer, the meltblown nonwoven fabric layer may further include at least one meltblown nonwoven fabric sublayer that is not electrically charged. Specifically, the meltblown nonwoven layer may include, in addition to at least one charged meltblown nonwoven sublayer, only one uncharged meltblown nonwoven sublayer; It may further include a plurality of uncharged meltblown nonwoven sublayers manufactured by a continuous process and integrated with each other.

At least one spunbond nonwoven fabric, at least one electrically charged meltblown nonwoven fabric, and/or at least one nonelectrostatic meltblown nonwoven fabric included in the composite nonwoven fabric are each independently composed of a nonconductive polymer. It also includes.

The non-conductive polymer is also the same as the non-conductive polymer included in the base resin of the insect repellent masterbatch for non-woven fabric.

Each of the spunbond nonwoven fabrics, each of the charged melt-blown nonwoven fabrics, and/or each of the non-charged meltblown nonwoven fabrics each independently further contains an additive.

The additives include pigments, light stabilizers, primary antioxidants, secondary antioxidants, metal deactivators, hindered amines, hindered phenols, fatty acid metal salts, triester phosphites, phosphates, and fluorine-containing compounds. , a nucleant, or a combination thereof.

Also, in one embodiment, the antioxidant can function as a charge enhancer. Possible charge increasing agents include thermostable organic triazine compounds, oligomers, or combinations thereof, which compounds or oligomers further contain at least one nitrogen atom other than the nitrogen in the triazine ring.

For example, charge increasing agents for the purpose of improving charging characteristics are disclosed in U.S. Patent Nos. 6,268,495, 5,976,208, 5,968,635, 5,919,847 and It is disclosed in the same No. 5,908,598. For example, the charge increasing agent may include a hindered amine-based additive, a triazine additive, or a combination thereof.

As another example, the charge increaser 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)] (CHIMASSORB 944 (manufactured by BASF)), (2,4 , 1,6-hexanediamine with ,6-trichloro-1,3,5-triazine, N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl) polymer, N-butyl -1-butanamine, a reaction product with N-butyl-2,2,6,6-tetramethyl-4-piperidinamine) (CHIMASSORB 2020 (manufactured by BASF)), or a combination thereof.

The charge increaser may be an N-substituted amino aromatic compound, in particular a tri-amino substituted compound, such as 2,4,6-trianilino-p-(carbo-2'-ethylhexyl-1'-oxy). )-1,3,5-triazine (UVINUL T-150 (manufactured by BASF)). Other charge increasing agents include 2,4,6-tris-(octadecylamino)-triazine, also known as tristearylmelamine ("TSM").

The content of the charge increasing agent is also 0.25 to 5 parts by weight per 100 parts by weight of the total weight of each charged melt-blown nonwoven fabric. If the content of the charge increasing agent is within the above range, not only can the high level of charging performance targeted by the present invention be obtained, but also the spinnability is good, the strength of the nonwoven fabric is maintained high, and the cost is reduced. It is also advantageous from the side.

In addition to the additives, the composite nonwoven fabric may further include commonly known additives such as a heat stabilizer and a weathering agent.

In the composite nonwoven fabric, the total content of the charged melt-blown nonwoven fabric is 3 to 50 parts by weight based on 100 parts by weight of the composite nonwoven fabric. If the total content of the electrically charged melt-blown 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 also has a basis weight (mass per unit area) of 10 to 500 g/m ² , for example, 20 to 100 g/m ² .

The plurality of nonwoven fabrics included in the composite nonwoven fabric are also integrated (i.e., bonded) to 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 distinct nonwovens that are neither spunbond nor meltblown nonwovens.

As another example, each of the additional layers may include one or more layers of other materials instead of nonwoven fabric.

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

A method for manufacturing a composite nonwoven fabric according to an embodiment of the present invention includes the steps of continuously forming spunbond nonwoven fabric layers (S100), and continuously forming meltblown nonwoven fabric layers on the spunbond nonwoven fabric layers (S200). )including.

The spunbond nonwoven fabric layer continuous forming step (S100) involves melt extruding, cooling and stretching a blend of a thermoplastic non-conductive polymer and the above-mentioned insect repellent masterbatch for nonwoven fabric to form fiber filaments. After forming, the fiber yarn is laminated on a screen belt to form a web.

In the melt-blown nonwoven fabric layer continuous formation step (S200), a thermoplastic non-conductive polymer (a charging performance improver can be added) is melt-extruded, hot-air stretched, and cooled to form a fiber filament, and then, The fiber filament is also laminated onto the spunbond web formed into a web in the spunbond nonwoven fabric layer continuous formation step (S100).

Specifically, in the melt-blown nonwoven fabric layer continuous formation step (S200), free fibers are (S200-1), continuously spinning the free fibers (S200-2), continuously spraying a polar solvent (for example, water) onto the free fibers, It also includes a step of continuously charging the fibers (S200-3), and a step of continuously accumulating the free fibers to continuously form a meltblown nonwoven fabric (S200-4).

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

Hereinafter, it will be explained in detail that the free fiber continuous charging step (S200-3) is different or has a remarkable effect compared to the conventional technology.

(1) In general, charging can be performed during the melt-blowing process through friction between a polar solvent and filaments being melt-spun, as in US Patent No. 6,375,886. In addition, as in U.S. Patent No. 6,969,484, a melt-blown nonwoven fabric is immersed in a polar solvent, and a suction device is used to allow water to pass through between the nonwoven fabrics, so that the water and the nonwoven fabric are separated. The method of charging through friction is mainly applied in industry to produce charged melt-blown nonwoven fabrics. In this way, the charging method using a polar solvent requires a separate post-process of drying the polar solvent after the charging process, and therefore it is basically a continuous process to laminate or composite nonwoven fabrics. It is technically impossible. No. 6,375,886 and No. 6,969,484 are incorporated herein by reference in their entirety.

(2) U.S. Patent No. 5,227,172 applies a high potential difference between a melt-blown die and a collector, and while the melt-spun resin is filamentized, it is induced by an ambient electric field. Although a method of making the fabric electrically charged is disclosed, the method can obtain a electrically charged meltblown nonwoven fabric without any additional post-processing. However, nonwoven fabrics treated with induction charging using a potential difference exhibit a phenomenon in which the charging efficiency drops sharply due to heat or the surrounding environment, so they require long-term storage during the sales process, such as masks for removing fine dust. However, it has the disadvantage that it is difficult to apply in applications where a long service life must be guaranteed, such as filters for air purifiers. No. 5,227,172 is incorporated herein by reference in its entirety.

The present inventors injected a polar solvent together with air in a two-fluid form onto a melt-blown nonwoven fabric layer, and with a small injection amount, the polar solvent particles with sufficient kinetic energy were rubbed against the filament being melt-spun. , has developed a charging processing device that has a highly efficient triboelectric charging effect, and such a charging processing device can sufficiently charge the heated air within the DCD (die to collector distance) section with a small injection amount. It is characterized by the fact that it is heated and evaporated, so there is no need for separate drying equipment. Due to such characteristics, the charging processing device can be combined with a nonwoven fabric manufacturing process and can compose nonwoven fabrics through continuous lamination.

The nonwoven fabric obtained by charging the melt-blown nonwoven fabric is permanently polarized so that negative charges and positive charges exist semi-permanently, and such a nonwoven fabric is called an electret nonwoven fabric. To tell.

As described above, the method for manufacturing the composite nonwoven fabric does not include a separate drying step for removing the polar solvent sprayed in the free fiber continuous charging step (S200-3).

Further, as described above, the polar solvent continuously injected in the free fiber continuous charging treatment step (S200-3) is caused by heated air within the DCD (die to collector distance) section of the composite nonwoven fabric manufacturing apparatus. , can be continuously heated and evaporated.

The method for manufacturing the composite nonwoven fabric further includes the step of continuously forming another spunbond nonwoven fabric layer on the meltblown nonwoven fabric layer (S300) in the same manner as the step of continuously forming the spunbond nonwoven fabric layer (S100). There are also things.

The method for producing the composite nonwoven fabric includes, after the step of continuously forming the meltblown nonwoven fabric layer (S200) or the step of continuously forming the other spunbond nonwoven fabric layer (S300), applying each of the spunbond layers to one or both sides of the meltblown nonwoven fabric layer. The method further includes a step (S40) of continuously thermocompressing the nonwoven fabric layers.

FIG. 1 is a diagram schematically illustrating a composite nonwoven fabric 10 including a nonwoven fabric according to an embodiment of the present invention.

A composite nonwoven fabric 10 according to an 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 .

At least one of the first spunbond nonwoven fabric layer 11, the meltblown nonwoven fabric layer 12, and the second spunbond nonwoven fabric layer 13 is a nonwoven fabric according to an embodiment of the present invention (i.e., a nonwoven fabric containing an insect repellent masterbatch for nonwoven fabric). There is also.

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

Yet another aspect of the present invention provides an article comprising the nonwoven fabric or the composite nonwoven fabric.

The article may also be a health or medical article.

Hereinafter, the present invention will be explained in more detail through Examples. The present Examples are provided to further specifically explain the present invention, 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: Propylene homopolymer (H7700 (LG Chem. As a liquid insect repellent, cinnamaldehyde, α-copaene, apiol and oleic acid were mixed in a ratio of 20:8:7:9 on a weight basis. An insect repellent masterbatch was prepared using a melt-kneading method 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 substance in the raw materials consisting of the base resin, the liquid insect repellent, and the carrier material. (based on weight) are shown in Table 1 below.

In addition, in the insect repellent masterbatches manufactured in Examples 1-1 to 1-3 and Comparative Examples 1-1 to 1-4, the content of the insect repellent component (weight basis) and the content of the carrier substance (weight basis) are shown in Table 2 below.

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 fabric layer (SB), propylene having a melting index (MI) of 34 g/10 min was used. A homopolymer (H7700 (manufactured by LG Chemicals)) was used, and as the polymer for forming the melt-blown nonwoven fabric layer (MB), a resin (H7910 (manufactured by LG Chemicals) with a melt flow index (MFR) of 1,000 g/10 min was used. )It was used. In addition, based on the total weight of the polymer for forming the spunbond nonwoven fabric layer (SB), insect repellents manufactured in Examples 1-1 to 1-3 and Comparative Examples 1-1 to 1-4 were used. One of the masterbatches was added according to the ratio shown in Table 3 below. Furthermore, Chimassorb 944, a hindered amine light stabilizer, was added to the melt-blown nonwoven fabric layer (MB) forming polymer at a content of 0.5 wt%. Thereafter, a composite nonwoven fabric in the form of spunbond/meltblown spunbond (SMS) was continuously manufactured using a composite nonwoven fabric manufacturing apparatus as shown in FIG. 1 . Specifically, the melt-blown nonwoven fabric layer (MB) is subjected to a continuous charging treatment by contacting air and water through a two-fluid nozzle in the composite nonwoven fabric manufacturing apparatus, and then the spunbond nonwoven fabric layer (SB ), and another spunbond nonwoven fabric layer (SB) is laminated on top of the meltblown nonwoven fabric layer (MB). As a result, an SMS nonwoven fabric laminate was obtained. Thereafter, the SMS nonwoven fabric laminate was manufactured into a single composite nonwoven fabric through a thermocompression bonding process between a roll with an embossed pattern and a smooth roll. Here, the overall basis weight of the SMS composite nonwoven fabric was adjusted to 100 gsm (g/m ² ), and the basis weight of the melt blown nonwoven fabric layer (MB) was adjusted to 22 gsm.

Evaluation Example 1: Evaluation of dispersion index of insect repellent masterbatches The dispersion index of the insect repellent masterbatches manufactured in Examples 1-1 to 1-3 and Comparative Examples 1-1 to 1-4 was evaluated, and the results were are shown in Table 4 below.

Evaluation Example 2: Evaluation of Physical Properties of Composite Nonwoven Fabrics The physical properties of the composite nonwoven fabrics produced in Examples 2-1 to 2-5 and Comparative Examples 2-1 to 2-6 were evaluated in the following manner. The results are shown in Table 5 below.

(1) Spinnability: It was observed whether the nonwoven web broke or not, and if it did not break, it was recorded as "good."

(2) Bacteriostatic activity value: The bacteriostatic activity value measurement method involves inoculating bacteria (i.e., Staphylococcus or Streptococcus pneumoniae) (i.e., using a test sample to completely absorb the test bacterial solution), and This is a method of culturing for a period of time and confirming the number of bacteria before culture and the number of bacteria after culture. The bacteriostatic activity value is measured by the following method: In other words, when the number of bacteria after culturing in the unprocessed control group is C, and the number of bacteria after culturing in the insect repellent treated product is B, the bacteriostatic activity value The activity value is calculated using Formula 2 below. Here, the unprocessed control group and the processed product are the same as each other in that they have a structure including three layers in that order: a first spunbond nonwoven fabric layer, a meltblown nonwoven fabric layer, and a second spunbond nonwoven fabric layer. The unprocessed control group was not treated with insect repellent treatment, whereas the processed products were treated with insect repellent treatment.

[Formula 2]
Bacteriostatic activity value = Log (C/B)

(3) Insect-repellent rate and persistence performance of adult Coccinella japonica: The insect repellent rate of adult Coccinella japonica is expressed as a percentage (%) of the number of viable Coccinella japonica in the processed product compared to the number of viable Coccinella in the unprocessed control group. This indicates the repellency performance of insect-repellent treated products. Here, the unprocessed control group and the processed product are the same as each other in that they have a structure including three layers in that order: a first spunbond nonwoven fabric layer, a meltblown nonwoven fabric layer, and a second spunbond nonwoven fabric layer. The processed products are different from each other in that the unprocessed control group is not treated with insect repellent, while the processed product is treated with insect repellent. The insect repellency rate of the adult Aspergillus japonica is measured by the following method: First, put a medium for the erectus elegans adult in a petri dish (large) 1, place a petri dish (small) 1 in the center; 1 contains the unprocessed control group and the sample for induction. Thereafter, put a medium for adult A. japonica in a petri dish (large) 2, place a petri dish (small) 2 in the center, and place an insect repellent treated product and a sample for attraction in the petri dish (small) 2. Thereafter, they are placed in an airtight container, and after 24 hours, Petri dish (small) 1 and Petri dish (small) 2 are taken out and the number of surviving mites in each is confirmed. Finally, the insect repellency rate of the adult shorthorn beetle is calculated using the following formula 3.

[Formula 3]
Insect repellency rate (%) of adult Coccinella flora = (Number of Coccinella floccus in petri dish (small) 1 - Coconut flora water in Petri dish (small) 2) / Number of Coconut floccus in petri dish (small) 1 x 100

In Equation 3 above, the term "surviving brown fleas" means an adult brown fleas that responds to external stimuli.

(3) Skin patch test grade: The skin test measurement method is as follows:
(i) Sample preparation: 5cm x 5cm size per sample (ii) Attach the sample between the human wrist and elbow and aging for 24 hours
(iii) After 24 hours, remove the sample and check for changes in the skin - Grade 1: Same as the initial skin - Grade 2: Slight flushing - Grade 3: More than half of the area is flushed - Grade 4: Flushing of all areas

(4) Color difference meter deviation (ΔE*): The skin test measurement method is as follows: Color difference meter deviation (ΔE*) of the composite nonwoven fabric was measured using a color difference meter ((CM3700D (manufactured by Minolta)). .

(5) Air permeability performance: Using the FX3300 air permeability measuring instrument, measure the air permeability (air permeability) under the measurement area and measurement pressure after placing the sample on the measuring instrument according to the KSK 0507 method. did.

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

(7) Abrasion and fluffing: A 15 cm piece was rubbed several times using the Martindale 404 measuring equipment and the fluffing was measured according to the KSK 0504 method.

Referring to Table 5 above, the composite nonwoven fabrics prepared in Examples 2-1 to 2-3 had excellent spinnability, insect repellent effect, skin patch test grade, air permeability performance, mechanical strength, and abrasion and fuzz evaluation. It has been shown that the grade is excellent and the color difference meter deviation (ΔE*) is at an appropriate level.

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

Furthermore, the composite nonwoven fabrics produced in Comparative Examples 2-2, 2-5, and 2-6 were shown to have poor insect repellent effects. In particular, the composite nonwoven fabric manufactured in Comparative Example 2-5 has a color difference meter deviation (ΔE*) that is out of the appropriate level, and cannot appeal to consumers as an organic farming sensation.

Although the present invention has been described with reference to drawings and embodiments, these are merely illustrative and a person of ordinary skill in the art will appreciate that various modifications and variations may be made therefrom. It will be appreciated that other and equivalent implementations are possible. Therefore, the true technical protection scope of the present invention is determined by the technical idea of the claims.

Claims (16)

mixing raw materials including a base resin, a liquid insect repellent and a carrier material to obtain a raw material mixture;
In the raw material, the content of the liquid insect repellent is 9,000 to 11,000 ppm on a weight basis,
The method for producing an insect repellent masterbatch for nonwoven fabric, wherein the content of the carrier material in the raw material is 30,000 to 50,000 ppm on a weight basis. The insect repellent master for nonwoven fabric according to claim 1, wherein the base resin comprises a non-conductive polymer selected from polyolefin, polystyrene, polycarbonate, polyester, polyamide, copolymers thereof, or combinations thereof. How to make batches. The method for producing an insect repellent masterbatch for nonwoven fabric according to claim 1, wherein the liquid insect repellent comprises cinnamaldehyde, α-copaene, apiol, oleic acid, or a combination thereof. The method for producing an insect repellent masterbatch for nonwoven fabric according to claim 1, wherein the carrier material comprises silica, zeolite, kaolin, or a combination thereof. An insect repellent masterbatch for nonwoven fabrics produced by the method for manufacturing an insect repellent masterbatch for nonwoven fabrics according to any one of claims 1 to 4. Contains a base resin, an insect repellent component and a carrier substance,
The content of the insect repellent component is 300 to 500 ppm on a weight basis,
In the insect repellent masterbatch for nonwoven fabric, the content of the carrier material is 30,000 to 50,000 ppm on a weight basis. The insect repellent masterbatch for nonwoven fabrics according to claim 6, wherein the insect repellent masterbatch for nonwoven fabrics has a dispersion index of 0.6 or more and less than 1.0. A nonwoven fabric comprising the insect repellent masterbatch for nonwoven fabric according to claim 7. The nonwoven fabric according to claim 8, wherein the nonwoven fabric contains the insect repellent masterbatch for nonwoven fabric in a proportion of 5 to 20% by weight based on the total weight of the nonwoven fabric. The nonwoven fabric has a bacteriostatic activity value of 5.0 or more for staphylococci and a bacteriostatic activity value of 6.0 or more for pneumococci, as measured by a bacteriostatic activity measurement method (JIS L 1902). The nonwoven fabric according to claim 8. 9. The nonwoven fabric has an insect repellency rate of 60% or more for adult shorthorn beetles one week after treatment, and exhibits a sustained performance of 40% or more even two weeks after treatment. Nonwoven fabric as described. The nonwoven fabric according to claim 8, wherein the nonwoven fabric has a skin patch test grade of grade 1 or higher. The nonwoven fabric according to claim 8, wherein the nonwoven fabric has a color difference meter deviation (ΔE*) of 2.0 to 3.0. The nonwoven fabric according to claim 8, wherein the nonwoven fabric exhibits air permeability of 300 to 700 cm ³ /cm ² /s. An article comprising the nonwoven fabric according to claim 14. 16. The article according to claim 15, wherein the article is a health or medical article.

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