KR20130130271A - A method for preparing meltblown web comprising aerogel - Google Patents

Abstract

The present invention relates to a method for manufacturing meltblown web containing aerogel evenly existing among microfibers which comprise the meltblown web. Provided is a method for manufacturing meltblown web containing aerogel, spraying the aerogel on a resin fiber which is sprayed from a nozzle to a collector; or spraying the aerogel and the resin fiber together from the nozzle by injecting the aerogel into air or steam fluid. Obtained is the meltblown web containing the hydrophobic aerogel which is firmly and evenly combined among the resin fibers when the resin fibers are magnetic coupling after the thermoplastic resin fibers and hydrophobic aerogel are laminated on the collector. The meltblown web shows an even physical property, such as, thermal insulation, heat insulation, adsorption, and/or noise absorption, in general by the micro fibers and hydrophobic aerogel which are evenly integrated.

Description

Method for manufacturing melt blown web containing airgel {A METHOD FOR PREPARING MELTBLOWN WEB COMPRISING AEROGEL}

The present invention relates to a method for producing a melt blown web containing an airgel, and more particularly, by introducing an airgel in the process of manufacturing a meltblown web, an airgel is uniformly and uniformly between the microfibers constituting the meltblown web. The present invention relates to a method for producing a meltblown web containing an airgel which is integrally present.

Meltblown webs are three-dimensional fiber aggregates in which microfibers are bonded to each other to have a web-like structure. Meltblown webs are made by spinning molten thermoplastic or polymer through a spinneret (meltblowing die) formed of many small orifices. The resin melted and extruded into the spinning nozzle is stretched by high temperature and high pressure air which is injected at high speed from both sides of the spinneret in the molten state, and is laminated to the collector with ultrafine fibers and magnetically bonded to form a meltblown web. do.

Since the meltblown web composed of fine fibers is very large and light in specific surface area, it is used in various applications such as various high performance filter materials, wipers, absorbent materials, insulation materials, and sound insulation materials.

Aerogels, on the other hand, have a porosity of 90% or more, a specific surface area of several hundreds to 1000 m 2 / g, and specific gravity of 0.1 to 0.12 g / cm 3. Aerogels having such a nanoporous structure have high light transmittance and very low thermal conductivity, and thus are very efficient super insulating materials.

Korean Patent Laid-Open Publication No. 1999-44531 discloses a method for producing a fiber composite containing an airgel using a mixture of airgel particles, fibers and binders. However, the binder may not only be present as an impurity in the final article, but the aerogels are very light particles and are difficult to mix uniformly with the binder (binder) and the fibrous material. When the airgel particles, the fiber material and the binder are not uniformly mixed, it is difficult to expect uniform physical properties in the resulting fiber composite.

Therefore, there is a need for a method of uniformly complexing an aerogel and a thermoplastic resin fiber without using a separate binder.

One embodiment of the present invention is to provide a method for producing a meltblown web containing an airgel.

Another embodiment of the present invention is to provide a method for producing a meltblown web containing an airgel in which an airgel is evenly and uniformly distributed between the fine fibers of the meltblown web.

According to a first aspect of the present invention,

Melting and extruding the thermoplastic resin;

Applying air or steam of high speed and pressure to the melt-extruded thermoplastic resin to inject the thermoplastic resin from the resin spray nozzle into the collector to the thermoplastic fiber; And

In the method of manufacturing a melt blown web comprising the step of laminating the thermoplastic resin fibers in the collector to form a melt blown web,

Provided is a method of manufacturing a meltblown web containing an airgel in which an airgel is sprayed onto the thermoplastic resin fibers.

According to a second aspect of the present invention,

Melting and extruding the thermoplastic resin;

Applying air or steam of high speed and pressure to the melt-extruded thermoplastic resin to inject the thermoplastic resin from the resin spray nozzle into the collector to the thermoplastic fiber; And

In the method of manufacturing a melt blown web comprising the step of laminating the thermoplastic resin fibers in the collector to form a melt blown web,

Provided is a method of manufacturing a meltblown web containing an airgel in which airgel is injected into high-speed and high-pressure air or steam applied to the melt-extruded thermoplastic resin, and the thermoplastic resin fibers and the airgel are injected together into a collector from a resin spray nozzle. .

According to a third aspect of the present invention,

Melting and extruding the thermoplastic resin;

Applying air or steam of high speed and pressure to the melt-extruded thermoplastic resin to inject the thermoplastic resin from the resin spray nozzle into the collector to the thermoplastic fiber; And

In the method of manufacturing a melt blown web comprising the step of laminating the thermoplastic resin fibers in the collector to form a melt blown web,

The first airgel is injected into the high-speed and high-pressure air or steam applied to the melt-extruded thermoplastic resin, and the thermoplastic resin fiber and the first airgel are sprayed together from the resin spray nozzle to the collector and sprayed from the resin spray nozzle to the collector. A method for producing a meltblown web containing a resin fiber and an airgel in which a second airgel is injected onto the first airgel is provided.

According to a fourth aspect of the present invention,

The thermoplastic resin contains an airgel which is at least one resin selected from the group consisting of polypropylene, polyethylene, ethylene vinyl acetate, polycarbonate, polyphenylene sulfide, polyethylene terephthalate, polyurethane, polyamide, and polyester. A method of making a meltblown web is provided.

According to a fifth aspect of the present invention,

The air or steam is a temperature of 200 ℃ to 380 ℃, the supply pressure is 0.1 kgf / ㎠ To 10 kgf / cm 2 A method for producing a meltblown web containing phosphorus aerogels is provided.

According to a sixth aspect of the present invention,

There is provided a method of producing a meltblown web containing an airgel having a distance from the resin spray nozzle to a collector of 5 cm to 150 cm.

According to a seventh aspect of the present invention,

The airgel is provided with a method for producing a meltblown web containing an airgel which is sprayed at a distance within 50 cm from the resin spray nozzle.

According to an eighth aspect of the present invention,

The airgel injection nozzle is provided with a method for producing a melt blown web containing an airgel located within a height of 20 cm with respect to the horizontal plane of the resin molecule nozzle.

According to a ninth aspect of the present invention,

Provided is a method of manufacturing a meltblown web further comprising providing a protective layer on one or both surfaces of the meltblown web.

According to a tenth aspect of the present invention,

In the melt blown web, the content of the thermoplastic resin fiber and the airgel is provided in a melt blown web having a weight ratio of 1: 0.01 to 1: 1.5.

According to the method of manufacturing a meltblown web according to the present invention, an airgel is injected into a thermoplastic resin fiber injected from the resin spray nozzle to a collector and / or an airgel is introduced into air or steam to collect the thermoplastic resin fiber and the aerogel. By spraying together and laminating on the phase, an aerogel-containing meltblown web in which the thermoplastic resin fibers and the airgel are uniformly and evenly complexed is obtained. Since airgel is a very light material having a specific gravity of 0.1 to 0.12 g / cm 3, there is a problem that cannot be introduced into a meltblown web manufacturing process like a general particulate material. However, in the method according to the present invention, the airgel is prevented from being scattered near the nozzle where the resin fibers are spun, or by introducing the airgel into the air (or the steam supply line), and the melt as a high-temperature and high-pressure spinning material flowing with the resin fibers. Aerogels are efficiently introduced into the blown web. The airgel-containing meltblown web prepared by the method according to the present invention is uniformly and evenly complexed with fine fibers and airgel, so that the uniform physical properties of the meltblown web are uniform, for example, heat insulation, heat retention, adsorption, and / or Blemishes and the like.

1 is a schematic diagram illustrating a manufacturing process of a meltblown web containing an airgel in which an airgel is injected onto a resin fiber injected from a resin spray nozzle according to an embodiment of the present invention.
Figure 2 is a schematic diagram showing the configuration of the apparatus used in the manufacturing process of the melt blown web containing the airgel according to one embodiment of the present invention in which an airgel inlet is connected to a supply line of air or steam.
FIG. 3 is a schematic diagram illustrating a manufacturing process of a meltblown web containing an airgel in which airgel is injected into air or steam and sprayed together with resin fibers and airgel from a resin fiber spray nozzle according to another embodiment of the present invention.
4 shows an airgel in which an airgel is injected onto a resin fiber injected from a nozzle to a collector according to another embodiment of the present invention, and an airgel is injected into air or steam to inject a resin fiber and an airgel together from a resin fiber injection nozzle. It is a schematic drawing which shows the manufacturing process of a meltblown web containing.
5 is a view showing a melt blown web containing an airgel prepared by the method according to one embodiment of the present invention.
6 is a view showing a form provided with a protective layer on both sides of the melt blown web containing the airgel manufactured by the method according to an embodiment of the present invention.

In the method according to one embodiment of the present invention, in order to produce an airgel-containing meltblown web in which the thermoplastic resin fibers and the airgel are integrated, the thermoplastic resin fibers and the airgel are laminated together as a fluid flowing in the collector. As such, the thermoplastic resin fibers and the aerogels are stacked together in a fluid flowing on the collector, so that when the thermoplastic fibers are self-bonded, the aerogels are complexed with the thermoplastic fibers so that the aerogels are uniformly and firmly integrated between the thermoplastic fibers. A meltblown web containing is obtained.

In the meltblown manufacturing method containing the airgel according to the present invention, (1) the airgel is sprayed onto the resin fiber sprayed from the nozzle to the collector so that the thermoplastic resin fibers and the airgel are laminated together in the collector, and / or ( 2) Airgel is introduced into the air or steam, characterized in that the resin fiber and the airgel is injected together from the nozzle. The method of applying the airgel during the manufacturing of the meltblown web according to the present invention can be applied to any manufacturing process of the meltblown web, which is generally known in the art, and the apparatus of the meltblown web manufacturing method in addition to the matters described herein. , Process conditions, resins used, fibers, properties of the meltblown web produced, and the like.

Hereinafter, a method of manufacturing a meltblown web containing an airgel according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a method according to one embodiment of the present invention in which an aerogel is sprayed onto a thermoplastic resin fiber sprayed from a nozzle to a collector and the thermoplastic resin fiber and an aerogel are laminated together on the collector.

As shown in FIG. 1, a thermoplastic resin is introduced into the resin inlet 5 of the extruder 1. As the thermoplastic resin introduced into the resin inlet 5, any thermoplastic resin known to be used in the manufacture of meltblown webs can be used.

The thermoplastic resin introduced into the resin inlet 5 is heated and extruded in a molten state. The extruded thermoplastic resin is pushed into the melt blowing die 2 at the tip of the extruder. The molten resin is injected into the ultrafine fibers by the high speed, high pressure air or steam supplied from the resin injection nozzle 3 at the tip of the die to the resin injection nozzle 3 through the air manifold 6. The thermoplastic resin fibers sprayed from the resin jet nozzle 3 are laminated on the rotating collector 4 to form a meltblown web.

According to the method according to one embodiment of the present invention, an airgel is separately sprayed onto the thermoplastic resin fibers injected by air or steam of high speed and high pressure from the resin jet nozzle 3 to the collector 4.

Specifically, as shown in FIG. 1, a separate airgel supply nozzle 7a and / or provided to face the upper and / or lower portion of the thermoplastic resin fiber injected from the spray nozzle 3 to the collector 4. The airgel is sprayed onto the resin fiber spray flowing through 7b).

In one embodiment of the present invention, the distance from the resin spray nozzle 3 to the collector 4 may be 5 cm to 150 cm. The distance between the resin spray nozzle 3 and the collector 4 is related to the uniformity and density of the meltblown web, and if the distance between the nozzle 3 and the collector 4 is too close, the web may not be sufficiently cooled by the resin fibers. Formation and adhesion of the spun resins are strong to obtain a final product in the form of a film rather than a web of three-dimensional network structure. If the distance is too long to reach the collector in a completely cooled state, the self-adhesive strength is lowered and the physical properties of the meltblown web, in particular, the strength is lowered. Therefore, in consideration of the properties of the meltblown web finally obtained, the distance between the resin spray nozzle 3 and the collector 4 is 5 cm to 150 cm, for example, 10 cm to 100 cm, for example , 10 cm to 50 cm, for example 20 cm to 50 cm.

Although airgel supply nozzles 7a and 7b are shown in FIG. 1, these may optionally be used one or both as needed. The width of the airgel supply nozzles 7a and / or 7 (b) is not particularly limited and may be any variable length, but the resin injection nozzles may be evenly sprayed on one or both surfaces of the sprayed resin spray. It may be provided with a length corresponding to the width of 3).

The airgel supply nozzles 7a and / or 7b are placed as close to the resin jet nozzle 3 as possible so that the airgel flows and stacks together toward the collector 4 according to the flow force of the high temperature and high pressure resin fiber fluid. It is good to be located. Since the sprayed resin is stretched within about 30 cm and accompanied by rapid cooling, the aerogel is preferably introduced within a distance that can be self-adhesive to the hot resin. In view of this, but not limited to this, the airgel supply nozzles 7a and / or 7b are within a distance of 50 cm, preferably 2 cm to 50 cm, preferably 2 cm to 50 cm from the resin jet nozzle 3, preferably May be located at a distance of 10 cm to 20 cm. For example, when the distance from the resin jet nozzle 3 to the collector 4 is 50 cm or less, the aerogel supply nozzle 7a at any part between the resin jet nozzle 3 and the collector 4. And / or 7b.

The airgel supply nozzles 7a and / or 7b may also be up to about 20 cm high, preferably in the horizontal plane of the resin supply nozzles, for example on a continuous line of fluid flow of the resin fibers so as to prevent scattering as much as possible. It is preferably located at a height of 1 cm to 20 cm.

In another embodiment of the present invention, the airgel may be injected into air or steam, and the resin fibers and the airgel may be sprayed together as a fluid jet from the nozzle and stacked on the collector. Figure 2 of the apparatus used in the manufacturing process of the melt blown web containing the airgel according to one embodiment of the present invention, the airgel inlet (8a), (8b) and (8c) is connected to the air or steam supply line (9) A schematic drawing showing the configuration is shown. In addition, in Figure 3, according to another embodiment of the present invention, the airgel is introduced into the air or steam through the airgel inlet (8a), (8b) and (8c) to the steam supply line (9) to the resin spray nozzle (3) Shows a process for producing a meltblown web containing an airgel in which resin fibers and aerogels are injected together into the collector 4 as a fluid jet.

As shown in Figs. 2 and 3, the air (or steam) supply line 9 is provided with airgel supply units 8a, 8b and / or 8c, and the airgel is an airgel supply unit 8a, Air or steam is introduced into the air or steam supply line 9 through at least one of 8b and 8c and flows with the flowing air or steam to the resin spray nozzle 3 through the air manifold 6. Supplied with. Therefore, the resin fiber and the airgel are injected together into the collector 4 through the resin jet nozzle 3. Although the airgel supply units 8a, 8b and 8c are shown in FIG. 3, these airgel supply units 8a, 8b and 8c are selectively opened or closed as necessary, at least one. The above can be used.

The introduction of the airgel into the airgel supply units 8a, 8b and / or 8c may be introduced by any method known in the art, but is not limited to this, for example, a metering pump Alternatively, the method may be supplied by a screw or supplying a mixture of air or steam fluid.

In another embodiment of the present invention, the airgel is injected into the resin fibers injected from the resin spray nozzle 3 to the collector 4, and at the same time, the resin is applied by applying both types of airgel to the air or steam Fiber and airgel can be applied together to the collector 4. The first airgel is supplied to air or steam through the airgel supply units 8a, 8b and / or 8c in FIG. 4, and the resin spray nozzles are also provided through the airgel injection nozzles 7a and / or 7b. The meltblown web manufacturing process including the resin fiber sprayed from the collector (3) from (3) and the airgel by another embodiment of this invention which injects the 2nd airgel to the 1st airgel is shown. In this embodiment, the aerogel is injected in two ways during the manufacturing process of the melt blown web. That is, the airgel is supplied to the air or steam through the airgel supply units 8a, 8b and / or 8c, and further separates the airgel into the fibers and airgel sprayed from the resin spray nozzle 3 again. Sprayed through the nozzles 7a and / or 7b. In order to distinguish the aerogels introduced in these two ways, for convenience, the aerogels supplied to the air or the steam through the aerogel supply units 8a, 8b and / or 8c are first airgel and the resin spray nozzle 3 The airgel injected through the separate airgel injection nozzles 7a and / or 7b to the fiber and the first airgel injected from the) is called a second airgel.

In the melt blown web apparatus used in the method in which the airgel is introduced into the air or steam supply line 9, the distance between the resin spray nozzle 3 and the collector 4 is 5 cm to 150 cm, eg For example, it may be 10 cm to 100 cm, for example 10 cm to 50 cm, for example 20 cm to 50 cm.

According to another embodiment of the present invention, the present invention is not limited thereto. For example, the thermoplastic resin fibers may be discharged at 0.01 g / hole / min to 2.5 g / hole / min. The discharge amount of the resin and / or the temperature of the air (or steam), etc. are factors that affect the thickness and distribution of the fibers constituting the meltblown web, and accordingly, the thickness of the fibers radiated through the orifice of the nozzle varies. Therefore, in consideration of this, it is preferable that the thermoplastic resin fibers are discharged at 0.01 g / hole / min to 2.5 g / hole / min.

According to another embodiment of the present invention, in consideration of the content of the airgel that can be attached to the resin fiber, the content ratio of the resin fiber and the airgel in the melt blown web is 1: 0.01 to 1: 1.5 ratio, Specifically, it is preferable to add an airgel so that the resin fibers may be 40% by weight to 99% by weight and the airgel is 1% by weight to 60% by weight based on the total weight of the meltblown web. Although not limited to this, the content of the airgel in the meltblown web is determined by the amount of airgel discharged through the airgel injection nozzles 7a and / or 7b or the airgel supply units 8a, 8b and / or ( 8c) can be adjusted by adjusting the amount of airgel injected.

According to another embodiment of the invention, the air or steam fluid is a temperature of 200 ℃ to 380 ℃ and supply pressure 0.1-10kgf / ㎠ It is preferable to supply. The manufacturing process parameters of the ultra-fine melt blown web are the extrusion temperature of the resin, the discharge amount, the temperature and pressure of the supplied air (or steam), and the temperature of the air or steam in terms of sufficient stretching and prevention of trimming of the discharged resin. 200 ° C to 380 ° C and supply pressure of 0.1 kgf / cm 2 To 10 kgf / cm 2 .

As the thermoplastic resin, any resin known to be used for manufacturing a meltblown web may be used. For example, but not limited to, polypropylene, polyethylene, ethylene vinyl acetate, polycarbonate, polyphenylene sulfide At least one resin selected from the group consisting of fides, polyethylene terephthalates, polyurethanes, polyamides, and polyesters.

The extrusion temperature of the resin is not particularly limited, and may vary depending on the melt index and melting point of the resin used, and may be applied in a range known in the art to an extrusion temperature used in the art.

The airgel may be any airgel generally known, and is not particularly limited. For example, hydrogels and / or hydrophobic airgels may be used as the airgel.

For example, methods for preparing aerogels are generally known and described in RK Colloid Chemistry of Silica and Silicates 1954, chapter 6; CJ Brinker, GW Scherer, Sol-Gel Science, 1990, Chaps 2 and 3, and the like.

Although not limited thereto, water glass or metal alkoxide may be used as the precursor of the airgel. When water glass is used as the aerogel precursor, it requires a pretreatment process to remove the salt, which is a general one. As the metal alkoxide, those having 1 to 6 carbon atoms in each alkyl group, preferably 1 to 4 carbon atoms, may be used. Such compounds are not particularly limited thereto, but tetraethoxysilane (TEOS) and tetrameth Toxysilane (TMOS), tetra-n-propoxysilane, aluminum isopropoxide, aluminum-sec-butoxide, cerium isopropoxide, hafnium tert-butoxide, magnesium aluminum isopropoxide, yttrium isopropoxide At least one selected from the group consisting of cations, titanium isopropoxide and zirconium isopropoxide may be used alone or in combination. In particular, tetraethoxysilane (TEOS) comprising silane is the most preferred metal alkoxide.

Hydrophobic airgels are hydrogels that are hydrophobically surface treated to prevent water absorption in the air, and the hydrophobic surface treatment can be performed by any method known in the art. Although not particularly limited thereto, for example, a silylated airgel or the like can be used.

Hydrophobization of the surface of the airgel is a silylation treatment, in which the formula R ¹ _{4- n} -SiX _n or R ³ Si-O-SiR ⁴ , where n is 1 to 3 and R ¹ is C ₁ -C ₁₀ , preferably Is C ₁ -C ₅ alkyl or C ₆ or C ₁₀ aromatic group, heteroaromatic group or hydrogen, X is a halogen element selected from F, Cl, Br, I, preferably Cl or C ₁ -C ₁₀ , preferably an alkoxy group of C ₁ -C ₅ , or an aromatic alkoxy group, a heteroaromatic alkoxy group, R ³ and R ⁴ may be the same or different from each other, C ₁ -C ₁₀ alkyl or C ₆ or C ₁₀ Aromatic groups, heteroaromatic groups, or groups each consisting of hydrogen), and the like.

Specific examples of the silylating agent include, but are not limited to, hexamethyldisilane, ethyltrimethoxysilane, ethyltriethoxysilane, triethylethoxysilane, trimethylethoxysilane, methyltrimethoxysilane, and methoxytrimethyl Silane, trimethylchlorosilane, triethylchlorosilane, and the like.

The ultrafine fibers generally have a thickness of 0.1 μm to 20 μm, preferably 0.1 μm to 10 μm, and the airgel has a particle size of 0.1 μm to 200 μm in consideration of the formation of a composite meltblown web with the ultrafine fibers. desirable.

The content of the thermoplastic resin fiber and the airgel in the meltblown web containing the airgel may be controlled by adjusting the spraying speed and / or the spraying amount of the thermoplastic resin fiber and the airgel. The content of aerogels and thermoplastic fibers in the final meltblown web was found to be 1: 0.01 to 1: 1.5 in the meltblown web due to aerogel adhesion to the fibers and reduced dust generation. It may be in the weight ratio, preferably 1: 0.01 to 1: 1 weight ratio, more preferably 1: 0.05 to 1: 1 weight ratio range.

The thickness of the meltblown web containing the airgel can be controlled by the spray rate, spray amount and / or rotational speed of the ultrafine fibers and / or airgel. As the collector 4, a rotating drum, a moving belt, or the like may be used. The meltblown web obtained by the method of the present invention has a thickness of approximately 0.1 mm to 20 mm and a basis weight (base weight) of 10-2000 gsm (gram per square meter (g / m 2), depending on the application, such as insulation, heat insulation, sound absorbing material, etc. If used, it may be 30-600 gsm depending on the density, thickness and application method, but is not limited thereto.

Furthermore, in another embodiment of the present invention, the method for producing a meltblown web according to the present invention may further include providing a protective layer on one or both surfaces of the resulting meltblown web. The protective layer may be provided on one side or both sides of the meltblown web in order to improve tensile strength and / or wear strength of the meltblown web and / or prevent the airgel particles from falling off. The protective layer may be nonwoven, film or paper, which may be attached to one or both sides of the meltblown web by an adhesive and / or resin. The protective layer may be a nonwoven fabric, fabric or knitted fabric of natural or synthetic fibers. The nonwoven fabric is not limited thereto, but may be, for example, spunbond, spunlace, flashbond needle punching, chemical bonding, wet or dry, or meltblown. The natural fiber may be cotton, hemp, wool or rayon fiber. The synthetic fibers may be polypropylene, polyethylene, ethylene vinyl acetate, polycarbonate, polyphenylene sulfide, polyethylene terephthalate, polyurethane, polyamide, polyester, polyaramid, polybenzimidazole (PBI), polybenzoxazole It may be at least one kind of synthetic fiber selected from the group consisting of (PBO). The nonwoven fabric used as the protective layer may have a thickness of about 0.1 mm to 2 mm and / or a basis weight of about 10 gsm to about 1000 gsm in terms of supplementing strength by the protective layer and / or preventing separation of the airgel.

The film may be a film of a single layer or a multilayer structure prepared by blowing a thermoplastic resin and a Ti-die method. The film is for example selected from the group consisting of, but not limited to, polypropylene, polyethylene, ethylenevinylacetate, polycarbonate, polyphenylene sulfide, polyethylene terephthalate, polyurethane, polyamide, and polyester It may be a film of at least one kind of resin. The thickness of the film may be 0.1 mm to 2 mm in terms of strength supplementation by the protective layer and / or preventing separation of the airgel.

The protective layer may be applied to one or both sides of the meltblown web by any method generally known in the art, but is not limited thereto, for example, one side of the meltblown web to be provided with a protective layer. Alternatively, the adhesive may be coated on both sides, and a nonwoven material, a film, or paper may be coated. Specifically, a coating method generally known in the art such as roll-to-roll coating and spray coating may be used. As the adhesive, an acrylic, polyvinyl alcohol, urethane, or ethylene vinyl acetate adhesive may be used.

Figure 5 shows a side view of a meltblown web containing an airgel prepared by the method according to one embodiment of the present invention. The meltblown web produced by the method according to one embodiment of the present invention is present in a uniform and firmly integrated state of the airgel 32 between the fibers 31, as shown in FIG.

6 shows a side view of the meltblown web provided with the protective layer 33 on both sides of the meltblown web. By the protective layer 33, not only the strength of the meltblown web is improved, but also the escape of potential airgel particles is prevented.

Meltblown web prepared by the method according to the embodiment of the present invention exhibits excellent thermal insulation, thermal insulation, adsorptivity, and / or flawability in the meltblown web. Therefore, it is suitable to use for various uses, such as a material of various high performance filters, a wiper, an adsorption | suction material, a heat insulating material, and a soundproofing material.

Hereinafter, the present invention will be described in more detail with reference to Examples. The following examples merely illustrate the invention and do not limit the invention.

Example  One

The meltblown web containing the airgel was manufactured using the meltblown nonwoven fabric manufacturing equipment shown in FIG. A polypropylene (PP) resin having a melt index (Melt Index, MI) 400 was supplied to the resin inlet 5 of the extruder 1. The injected PP resin was heated to about 290 ° C. while melting through the extruder 1. The molten PP resin was supplied to the resin spray nozzle 3 through a gear pump (not shown). The molten resin fiber supplied to the resin spray nozzle 3 is about 50 cm away from the tip of the resin spray nozzle 3 through high-speed, high-pressure air (temperature 300 ° C., pressure 2 kgf / cm 2 to 4 kgf / cm 2). The resin was injected into the collector 4 located at a discharge amount of 0.15-0.20 g / hole / min.

On the other hand, from about 13 g / min of hydrophobic airgel powder having a particle size of about 60 to 80 µm from the airgel injection nozzles 7a and 7b located at a distance of about 5 cm and a height of 2 cm from the resin supply nozzle 3 to Spraying in an amount of 18 g / min.

As the PP resin fiber and the airgel are laminated to the collector 4 by high speed and high pressure gas and naturally cooled in the collector 4, the airgel and the PP fiber are uniformly and firmly mixed as shown in FIG. Meltblown webs containing were formed.

The prepared melt blown web has a thickness of about 10 mm, a basis weight of about 80 g / m 2 (gsm), and a fiber diameter of about 1 μm to 15 μm and an airgel content of 15 wt% in the melt blown web and PP. The content of the resin fiber was 85% by weight. In addition, the prepared meltblown web exhibited excellent thermal insulation with a thermal conductivity of 30 mW / mK or less.

Example  2

Meltblown webs were manufactured using the meltblown nonwoven fabric manufacturing equipment shown in FIGS. 2 and 3. A PP resin having a melt index (Melt Index, MI) 1500 was supplied to the resin inlet 5 of the extruder 1. The injected PP resin was heated to about 250 ° C. to 280 ° C. while melting through the extruder 1. The molten resin was supplied to the injection nozzle 3 through a gear pump (not shown). Meanwhile, hydrophilic airgel powder having a particle size of about 60 to 80 탆 was supplied to the air supply line 9 through the airgel supply units 8a, 8b, and 8c. Thus, the airgel powder was supplied to the air manifold ( 6) was supplied with air. Airgel was supplied to the airgel supply unit at 18 g / min to 24 g / min.

The resin fiber supplied to the injection nozzle 3 and the airgel powder supplied to the air supply line 9 are resin injection nozzles through high speed and high pressure air (temperature 320 ° C., pressure 5 kgf / cm 2 to 8 kgf / cm 2). It was injected at a discharge amount of 0.15-0.20 g / hole / min to the collector 4 located at a distance of about 50 cm from the tip of (3).

As the PP resin fiber and the airgel are laminated to the collector 4 by high speed and high pressure gas and naturally cooled, the airgel 32 and the PP fiber 31 are uniformly and firmly mixed as shown in FIG. 5. Meltblown webs containing were formed.

An acrylic adhesive was used on both surfaces of the melt blown web prepared above, and a polypropylene nonwoven fabric having a basis weight of 20 gsm and a thickness of 0.19 mm prepared by a spunbond method was adhered.

In this embodiment, a meltblown web provided with the protective layer 33 as shown in Fig. 6 was obtained. The prepared melt blown web has a thickness of about 1 mm, a basis weight of about 120 g / m 2, a fiber diameter of about 1 μm to 15 μm, and an airgel content of 20 wt% in the melt blown web and PP resin fiber. The content of was 80% by weight. In addition, the prepared meltblown web exhibited excellent thermal insulation with a thermal conductivity of 30 mW / mK or less.

1 ... extruder 2 ... melt blowing die
3 ... resin spray nozzle 4 ... collector
5 ... Resin input 6 ... Air (or steam) manifold
7a, 7b ... Airgel Injection Nozzles 8a, 8b, 8c ... Airgel Supply Unit
9 ... Air (or Steam) Supply Line 10 ... Air (or Steam) Supply Line
31 ... Resin Fiber 32 ... Aerogel
33 ... protective layer

Claims (10)

Melting and extruding the thermoplastic resin;
Applying air or steam of high speed and pressure to the melt-extruded thermoplastic resin to inject the thermoplastic resin from the resin spray nozzle into the collector to the thermoplastic fiber; And
In the method of manufacturing a melt blown web comprising the step of laminating the thermoplastic resin fibers in the collector to form a melt blown web,
Method for producing a melt blown web containing an airgel in which an airgel is sprayed onto the thermoplastic resin fibers.
Melting and extruding the thermoplastic resin;
Applying air or steam of high speed and pressure to the melt-extruded thermoplastic resin to inject the thermoplastic resin from the resin spray nozzle into the collector to the thermoplastic fiber; And
In the method of manufacturing a melt blown web comprising the step of laminating the thermoplastic resin fibers in the collector to form a melt blown web,
Airgel is injected into the high-speed and high-pressure air or steam applied to the melt-extruded thermoplastic resin, the method of producing a melt blown web containing an airgel is injected from the resin injection nozzle with the thermoplastic resin fibers and aerogel to the collector.
Melting and extruding the thermoplastic resin;
Applying air or steam of high speed and pressure to the melt-extruded thermoplastic resin to inject the thermoplastic resin from the resin spray nozzle into the collector to the thermoplastic fiber; And
In the method of manufacturing a melt blown web comprising the step of laminating the thermoplastic resin fibers in the collector to form a melt blown web,
The first airgel is injected into the high-speed and high-pressure air or steam applied to the melt-extruded thermoplastic resin, and the thermoplastic resin fiber and the first airgel are sprayed together from the resin spray nozzle to the collector and sprayed from the resin spray nozzle to the collector. A method for producing a meltblown web containing a resin fiber and an airgel in which a second airgel is injected onto the first airgel.
The method of claim 1, wherein the thermoplastic resin is polypropylene, polyethylene, ethylene vinyl acetate, polycarbonate, polyphenylene sulfide, polyethylene terephthalate, polyurethane, polyamide, and polyester. A method for producing a meltblown web containing an airgel which is at least one resin selected from the group consisting of.
The air or steam of claim 1, wherein the air or steam has a temperature of 200 ° C. to 380 ° C. and a supply pressure of 0.1 kgf / cm 2. To 10 kgf / cm 2 Method for producing a meltblown web containing phosphorus airgel.
The method for producing a meltblown web according to any one of claims 1 to 3, wherein the distance between the collector and the collector from the resin jet nozzle is 5 cm to 150 cm.
4. The method of claim 1 or 3, wherein the airgel contains an airgel sprayed at a distance of 50 cm or less from the resin spray nozzle.
4. The method of claim 1 or 3, wherein the airgel jetting nozzle comprises an airgel located at a height of 20 cm or less with respect to the horizontal plane of the resin molecule nozzle.
The method according to any one of claims 1 to 3, further comprising providing a protective layer on one or both surfaces of the meltblown web.
The method of any one of claims 1 to 3, wherein the content of the thermoplastic resin fibers and the airgel in the meltblown web is 1: 0.01 to 1: 1.5 weight ratio.

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