KR20100108800A - Composite nonwoven fabric for frotecting automotive surface and preparation method thereof - Google Patents

Abstract

PURPOSE: A complex nonwoven fabric for the paint film protection of a vehicle is provided to effectively protect the vehicle surface from the external moisture or contamination. CONSTITUTION: A complex nonwoven fabric is made of a filament fiber having the average diameter of 10-30um. The fabric is formed between at least two spunbonded which has a weight per a unit area of 10-30gr/m^2 and the spunbonded nonwoven layers. The fabric is made of a filament fiber having the average diameter of 1-5um and includes at least one meltblown nonwoven layer which has a weight per a unit area of 3-15gr/m^2. A first polymer is radiated to the spunbond and a first filament fiber is formed. A second polymer is radiated with a meltblow process and a second filament fiber is formed. A laminated filament fiber is heat-contacted.

Description

Composite non-woven fabric for automobile film protection and its manufacturing method {COMPOSITE NONWOVEN FABRIC FOR FROTECTING AUTOMOTIVE SURFACE AND PREPARATION METHOD THEREOF}

The present invention relates to a composite nonwoven fabric for automobile film protection and a method for manufacturing the same. More specifically, the present invention can effectively protect the vehicle surface from external moisture or contamination during transportation or storage of the vehicle, and exhibits excellent mechanical properties, thereby making it possible to manufacture composite nonwoven fabrics suitable for use in protecting films of automobiles and their manufacture. It is about a method.

It usually takes a while to build and ship a car and deliver it to a customer. During this period, the vehicle may be exposed to various pollutions, scratches or moisture from the outside. In particular, such a phenomenon may be further exacerbated when long-term movement is required, such as when exporting, or when the selling period is long and stored for a long time.

Therefore, it is necessary to effectively protect the surface of the vehicle before delivering the vehicle to the end customer to minimize the effects of contamination, scratches or moisture from the outside. In the past, a method of covering or shielding the fiber covering the entire vehicle surface has been considered to achieve this purpose. However, this method is expensive and disadvantageous in terms of management.

Accordingly, a method of coating a waterproof film on the surface of the vehicle may be considered, but a general waterproof film lacks moisture permeability, and thus, when the vehicle is stored for a long time in a high temperature and high humidity environment, residual moisture between the waterproof film and the automotive coating film may occur. This can damage or discolor the automotive coating.

In addition, in order to suppress such disadvantages, a method of using a fabric such as a fabric or knit fabric having excellent moisture permeability may be considered, but such a fabric or knit fabric is generally poor in water resistance and thus easily penetrates moisture from the outside. It is difficult to effectively protect the automobile coating from the external moisture, and in particular, the external moisture may penetrate during washing of the vehicle before delivery, thereby causing contamination on the surface of the automobile coating.

In order to solve these shortcomings, methods of applying a moisture-permeable and waterproof fabric, nonwoven fabric, or porous film to the surface of the automotive coating film requiring protection have been proposed or applied.

For example, DuPont's tyvek nonwoven fabric is composed mainly of polyethylene and consists of ultrafine fibers. Such a nonwoven fabric is not only excellent in moisture permeability and waterproofness, but also high in strength and thickness, and thus can sufficiently perform a new car protection function against penetration of external pollutants. However, such a nonwoven fabric has a very high manufacturing cost and is very unsuitable to be used for single use such as for automobile film protection.

For this reason, a porous polyethylene film that is relatively inexpensive and exhibits moisture permeability and water resistance is now widely used as a coating material for automobiles. However, such porous polyethylene film has a problem in use due to lack of mechanical properties such as low strength and high elongation because the material is flexible. In other words, when double-sided tape is attached to one side of the porous polyethylene film and adhered to the car paint film, it is often easily stretched or torn even with a slight force, and the film is attached to the car and then loaded into the transport vehicle for high speed. There are also many cases of tearing due to strong winds when moving or storing outdoors.

If such a problem occurs, the pollution of the car is easy to appear, so the quality of the finished car is reduced.

Accordingly, the present invention is to provide a composite nonwoven fabric suitable for use for protecting the film of the vehicle, as it can effectively protect the vehicle surface from external moisture or contamination during transportation or storage of the vehicle, and exhibits excellent mechanical properties.

The present invention also provides a method for producing a composite nonwoven fabric for protecting a film of the vehicle.

The present invention is composed of filament fibers having an average diameter of 10 to 30㎛, each of two or more spunbond nonwoven layers having a weight per unit area of 10 to 30gr / m ² ; And at least one meltblown nonwoven layer formed between the two or more spunbond nonwoven layers, the filament fibers having an average diameter of 1 to 5 μm, each having a weight per unit area of 3 to 15 gr / m ² . It provides a composite nonwoven fabric for car film protection.

The invention also comprises spunbonding a first polymer to form a first filament fiber having an average diameter of 10 to 30 μm; Meltblown spinning the second polymer to form a second filament fiber having an average diameter of 1 to 5 μm; Stacking them in the form of a web in the order of the first filament fibers, the second filament fibers and the first filament fibers; And thermally bonding the filament fibers laminated in the web form.

In addition, the present invention provides a cover for protecting a film of a vehicle including the composite nonwoven fabric.

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

According to one embodiment of the invention, two or more spunbond nonwoven layers made of filament fibers having an average diameter of 10 to 30 μm, each having a weight per unit area of 10 to 30 gr / m ² ; And at least one meltblown nonwoven layer formed between the two or more spunbond nonwoven layers, the filament fibers having an average diameter of 1 to 5 μm, each having a weight per unit area of 3 to 15 gr / m ² . Provided is a composite nonwoven fabric for car coat protection.

In general, spunbond nonwovens are known to be suitable for high volume manufacturing and exhibit a characteristic high strength and thin structure. However, these spunbond nonwoven fabrics are known to exhibit high strength but lack watertightness because they are not dense in structure.

Meltblown nonwoven fabrics, on the other hand, are composed of ultrafine fibers made of materials such as polypropylene or polyester, and are known to exhibit high water resistance (water resistance) and excellent moisture permeability due to their unique microstructure. However, such a meltblown nonwoven fabric is known to lack mechanical properties such as strength as it is made of a fine fiber structure.

As a result of the experiments of the present inventors, these spunbond nonwoven fabrics and meltblown nonwoven fabrics are alternately laminated so that at least one meltblown nonwoven fabric layer is formed between two or more spunbond nonwoven fabric layers (for example, two layers of spunbond fabrics). It has been found that by providing a composite nonwoven fabric having a single meltblown nonwoven fabric layer between the nonwoven fabric layers), a composite nonwoven fabric exhibiting mechanical properties such as excellent strength with excellent moisture permeability and waterproofness can be obtained.

In particular, by controlling the average diameter of the filament fibers constituting the laminated spunbond nonwoven fabric layer and the meltblown nonwoven fabric layer in a specific range, and by adjusting the weight per unit area of each of these nonwoven fabric layers in a specific range, It has been found that the advantages of the nonwoven layer can be synergistic and result in a composite nonwoven fabric having very good moisture permeability, water resistance and excellent mechanical properties.

Such a composite nonwoven fabric has a significantly lower manufacturing cost than a Tyvek nonwoven fabric and the like, and shows equivalent waterproofness and moisture permeability, and in particular, even when having a relatively low weight, it may exhibit excellent mechanical properties such as strength or elongation.

Thus, such composite nonwovens can solve the disadvantages of those previously considered or used as coating materials for automotive coatings, and can effectively protect the coating surface of automobiles from external contamination, moisture or scratches. Therefore, such a composite nonwoven fabric can be very preferably used for coating film protection of automobiles.

Meanwhile, the composite nonwoven fabric includes a spunbond nonwoven layer having a meltblown nonwoven layer interposed therebetween, and the spunbond nonwoven layer includes, for example, polyester filament fibers, polypropylene filament fibers, or polyamides. It can be made of a system filament fiber, or two or more composite filament fibers selected from them. The material of the filament fibers constituting the spunbond nonwoven fabric layer is considering the material of the meltblown nonwoven fabric layer laminated together, the average diameter of the filament fibers constituting each nonwoven fabric layer, or the moisture permeability / water resistance of each nonwoven fabric layer, It may be appropriately selected from the various materials described above. However, the polyester fiber is relatively excellent in strength, and the polypropylene fiber is excellent in hydrophobicity and excellent in terms of waterproofing, the spunbond nonwoven layer is made of polypropylene filament fiber or polyester filament fiber This is preferred.

In addition, the spunbond nonwoven layer included in the composite nonwoven fabric according to one embodiment of the invention is made of filament fibers having an average diameter of 10 to 30㎛, preferably made of filament fibers having an average diameter of 10 to 20㎛ . If the average diameter of the filament fibers is too small to less than 10㎛, the filament fibers are too thin can be cut during the manufacturing process, thereby reducing the physical properties such as strength. On the contrary, when the average diameter of filament fiber becomes large too much, the strength, waterproofness, etc. of the composite nonwoven fabric containing a spunbond nonwoven fabric layer will fall, and it is hard to use it for the coating film protection of automobile.

In addition, the spun-bonded non-woven fabric layer can have a 10 to have the amount of the per unit area of 30gr / m ^2, preferably 10 to weight per unit area of 25gr / m ^2, respectively. If the weight per unit area of the spunbond nonwoven fabric layer is too small, the physical properties such as strength or waterproofness may not be sufficient.On the contrary, if the weight per unit area of the spunbond nonwoven fabric layer is too large, the improvement of some strengths, etc., due to the increase in weight Even if this is not only necessary to protect the coating film of the car, but also the thickness can be excessively thick and the cost of materials can increase.

In addition, the above-described spunbond nonwoven layer is included in at least two so as to be laminated on at least both sides of the meltblown nonwoven layer, wherein the two or more spunbond nonwoven layers are the same material, the same average diameter of the filament fibers and the weight per unit area. Or the like, but each of these materials, the average diameter of the filament fibers or the weight per unit area may be different from each other. The material of each spunbond nonwoven fabric layer, the average diameter of the filament fibers, the weight per unit area, and the like can be obviously selected by those skilled in the art in consideration of the waterproofness, moisture permeability, or mechanical properties required for each of the nonwoven fabric layers.

Meanwhile, the composite nonwoven fabric according to an embodiment of the present invention includes a meltblown nonwoven layer in which at least one is laminated therebetween with the spunbond nonwoven layer described above. Such a meltblown nonwoven layer is, for example, polyester-based filament fibers, polypropylene-based filament fibers, polyurethane-based filament fibers, polyvinyl difluoride (PVDF) -based filament fibers or polymethyl methacrylate (PMMA) -based Filament fibers or two or more composite filament fibers selected from them. The material of the filament fibers constituting the meltblown nonwoven layer is also considering the material of the spunbond nonwoven layer laminated together, the average diameter of the filament fibers constituting each nonwoven layer, or the moisture permeability / water resistance of each nonwoven layer accordingly. It may be appropriately selected from the various materials described above. However, in terms of physical properties such as moisture permeability or waterproofness, the meltblown nonwoven layer is preferably made of polypropylene filament fibers.

In addition, the meltblown nonwoven layer is made of filament fibers having an average diameter of 1 to 5 μm, preferably made of filament fibers having an average diameter of 3 to 5 μm. If the average diameter of the filament fibers is too small to less than 1 μm, the filament fibers may be too thin and not easy to manufacture. On the contrary, if the average diameter of the filament fibers is too large, the strength and waterproofness of the composite nonwoven fabric may be increased. This lowers, so that it is difficult to be preferably used for protecting a coating film of an automobile.

And, the meltblown nonwoven fabric layer has a weight per unit area of from 3 to 15gr / m ^2, and preferably may have a weight per unit area of from 4 to 10gr / m ^2. More specifically, when the average diameter of the filament fibers constituting the meltblown nonwoven layer is 3 μm or less, the weight per unit area of the meltblown nonwoven layer may be 3 to 15 gr / m ² , but the filament fibers When the average diameter is 4 to 5 탆, the weight per unit area of the meltblown nonwoven fabric layer is preferably 4 to 15 gr / m ² .

If the weight per unit area of the spunbond nonwoven fabric layer is too small, the physical properties such as strength and waterproofness may not be sufficient. On the contrary, if the weight per unit area of the spunbond nonwoven fabric layer is too large, the improvement of some properties due to the improvement in weight may be achieved. Even if it is not necessary to protect the coating of automobiles, the cost of materials may increase.

As described above, the composite nonwoven fabric may exhibit physical properties such as waterproofness, moisture permeability, or strength suitable for use for automobile film protection at a weight per unit area of about 24 gr / m ² or more, and preferably of 24 to 60 gr / m ² . It may have a weight per unit area.

The weight per unit area corresponds to 50 to 75% of the porous polyethylene film, which is conventionally used most often for the protection of automotive coatings, and the composite nonwoven fabric is suitable for use in the protection of automotive coatings even at such low weight. It can exhibit various physical properties. Therefore, by using such a composite nonwoven fabric it is possible to provide an economical and environmentally friendly coating film protection cover of a vehicle.

In addition, the composite nonwoven fabric may have an average thickness of 0.10 to 0.30 mm, preferably an average thickness of 0.10 to 0.25 mm. The composite nonwoven fabric may exhibit excellent waterproofness or strength suitable for protecting a film of a vehicle even though it has such a small average thickness. Therefore, the composite nonwoven fabric may have ease of use and may provide an economical film protection cover of a vehicle.

On the other hand, according to another embodiment of the invention, there is provided a method for producing the composite nonwoven fabric described above. Such a method for producing a composite nonwoven fabric includes spunbonding a first polymer to form a first filament fiber having an average diameter of 10 to 30 μm; Meltblown spinning the second polymer to form a second filament fiber having an average diameter of 1 to 5 μm; Stacking them in the form of a web in the order of the first filament fibers, the second filament fibers and the first filament fibers; And thermally bonding the filament fibers laminated in the web form.

By this manufacturing method, a composite nonwoven fabric having the above-described excellent physical properties can be produced by a very simple process of forming filament fibers constituting each nonwoven fabric layer and then laminating and thermally bonding them.

The manufacturing method will be described in each step as follows.

In the above production method, first, the first polymer and the second polymer are spunbonded and meltblown respectively to form a first filament fiber constituting the spunbond nonwoven layer and a second filament fiber constituting the meltblown nonwoven layer. do.

At this time, the types of the first polymer and the second polymer that can be used are as described above for the composite nonwoven fabric. That is, the first polymer made of the spunbond nonwoven fabric material may be one or more kinds of polyester polymer, polypropylene polymer or polyamide polymer, and the second polymer made of the meltblown polymer. May be at least one of a polyester polymer, a polypropylene polymer, a polyurethane polymer, a polyvinyldifluoride (PVDF) polymer, or a polymethyl methacrylate (PMMA) polymer.

In addition, the process of spinning the first polymer and the second polymer to form the first filament fiber and the second filament fiber may be in accordance with the conventional spunbond nonwoven fabric forming process and the meltblown nonwoven fabric forming process, respectively. For example, the first filament fibers forming the spunbond nonwoven fabric layer may be formed by melt spinning the first polymer and then stretching the spun result using an air stretching apparatus. In addition, according to a conventional meltblown nonwoven fabric forming process, the second filament fibers forming the meltblown nonwoven fabric layer may be formed by melting the first polymer and then blowing the molten polymer with hot air.

In the process of forming the first and second filament fibers, the average diameter of the first and second filament fibers is 10 to 30 µm and 1 to 5 µm, respectively, so that the properties of the composite nonwoven fabric are desirable.

On the other hand, after each of the first and second filament fibers is formed by the above-described method, these filament fibers are laminated in the order of the first filament fibers, the second filament fibers, and the first filament fibers. This lamination process proceeds by laminating these filament fibers in the form of a web by the open method according to a conventional nonwoven fabric manufacturing process.

Then, after laminating the filament fibers in the form of a web, the filament fibers are thermally bonded to form a composite nonwoven fabric, the composite nonwoven fabric comprising a second filament fiber between a spunbond nonwoven layer composed of first filament fibers. Meltblown nonwoven layer consisting of a may be formed structure.

In the thermal bonding step, the filament fibers may be pressurized with a high-temperature / high pressure calender roll or emboss roll, for example, an emboss roll of 150 to 200 ° C. according to a general nonwoven fabric manufacturing process. .

Through the above-described method, the composite nonwoven fabric according to the embodiment of the present invention can be manufactured in a simplified process, and the composite nonwoven fabric has various properties such as excellent waterproofness, moisture permeability, or strength that can be preferably used as a material for protecting a film of automobiles. Indicates. Therefore, such a composite nonwoven fabric can be applied very favorably to the coating film protection cover of an automobile.

As described above, according to the present invention, a composite nonwoven fabric can be provided that exhibits mechanical properties such as excellent strength and elongation, with excellent waterproofness and moisture permeability, without having a high manufacturing cost. In particular, such composite nonwovens can exhibit excellent mechanical properties even under low weight.

Therefore, the composite nonwoven fabric can be used to effectively protect the vehicle coating film surface from external moisture, contamination, scratches, and the like, and exhibits mechanical properties such as high strength even at low weight, thereby greatly improving ease of use.

In addition, such a composite non-woven fabric has a relatively low manufacturing cost and the amount of material used is reduced, thereby making it possible to provide an economical and environmentally friendly automotive film protection cover.

Hereinafter, the configuration and effects of the invention will be described in more detail with reference to specific examples and comparative examples in order to help understanding of the invention. However, the following examples are only intended to more clearly understand the invention, and are not limited to the following examples of the invention.

Examples 1-5

The first filament fibers were formed by melting and spinning a polypropylene chip having a melt index (M.I.) of 34 at a melting temperature of 228 ° C. The process of forming the first filament fiber was performed according to the filament forming process of a conventional spunbond nonwoven fabric.

A polypropylene chip having a melt index (M.I.) of 900 was melted at a melting temperature of 260 ° C. and blown with hot air to form a second filament fiber. The process of forming the second filament fiber was performed according to the filament forming process of a conventional meltblown nonwoven fabric.

Average diameters of the first and second filament fibers formed as described above are summarized in Table 1 below.

In the order of the first filament fiber, the second filament fiber and the first filament fiber, these filament fibers were laminated in the form of a web by the open-loop method. To this end, the spunbond nonwoven fabric and the meltblown nonwoven fabric manufacturing equipment were arranged in the advancing direction, respectively, and the filament forming process was carried out. .

Thereafter, the filament fibers laminated in the web form were thermally bonded by using an embossing roll (160 ° C.) having an adhesion ratio of 14%, and the resultant was wound on a winder to prepare composite nonwoven fabrics of Examples 1 to 5. .

Comparative Example 1

Polyethylene breathable film, which was previously mainly used as a material for protecting a film of automobiles, was prepared at a weight of 95 gr / m ² per unit area to make Comparative Example 1.

Comparative Example 2

DuPont Tyvek nonwoven fabric having a weight of 45 gr / m ² per unit area was obtained and used as Comparative Example 2.

Comparative Example 3

Without adding the meltblown nonwoven fabric layer, only the two spunbond nonwoven fabric layers were formed, and the nonwoven fabric of the comparative example 3 was produced. At this time, each spunbond nonwoven layer was formed in the same manner as in Example 1 except that the spunbond nonwoven fabric layer was made of filament fibers having an average diameter shown in Table 1 and had a weight per unit area of Table 1 below.

Comparative Examples 4 and 5

The composite nonwoven fabrics of Comparative Examples 4 and 5 were prepared in the same manner as in Example 1 except that the average diameter of the filament fibers constituting each nonwoven fabric layer or the weight per unit area of each nonwoven fabric layer was changed as shown in Table 1 below. .

Experimental Example (Measurement of Properties)

For the nonwoven fabric (composite nonwoven fabric, nonwoven fabric or porous film) according to the above Examples and Comparative Examples, the physical properties were measured by the following method, and the results of the physical properties are summarized in Table 2 below.

1) Average filament fiber diameter (D): Cut the cross section of the nonwoven fabric (or composite nonwoven fabric), take 20 spots with an electron microscope, find 100 fiber diameters, calculate the average, and average the filament fibers that form each nonwoven fabric layer. The diameter was derived.

2) Water pressure measurement standard: ISO 811 (Low water pressure method, = KS K 0591)

The water pressure was measured according to KS K 0591 (Water Resistance Test Method of Fabric-Low Water Pressure Method). That is, a cylindrical cylinder capable of applying hydraulic pressure was mounted on the top of the funnel on which the test piece having a diameter of 11.4 cm was fixed. At this time, the test piece was fixed so that the resin layer might contact the funnel. While supplying water continuously to the cylindrical cylinder at a speed of 1 cm / sec, the water pressure when water droplets were seen at three places on the back of the test piece was measured in centimeters, and the water pressure at this time was taken as the internal pressure.

3) Water vapor permeability measurement standard: JIS L 1099 (calcium chloride method, 38 ℃, 90% RH)

The specimen was placed in the center and water and dried calcium chloride were prepared on both specimens. At this time, the weight of calcium chloride was 30 g (Upright method). The sample was placed in a thermostat for 1 hour and then weighed. The sample was then weighed again at 38 ° C. and 90% RH for 1 hour. At this time, the moisture permeability was calculated by converting the increased sample weight.

4) Tensile strength and elongation: JIS L 1906 (cut strip)

5) Tear strength: JIS L 1906 (single tongue)

6) Bursting strength: JIS L 1906 (mullen burst)

7) Breathability (ccs): ASTM D737 Framing Method (125 Pa)

TABLE 1

division Spunbond Nonwoven Layer (Upper) Meltblown Nonwoven Layer Spunbond nonwoven fabric layer (lower layer) Weight per unit area (gr / m ² ) Thickness (mm) Weight per Unit Area (gr / m ² ) / Average Diameter of Filament Fibers (μm) Example 1 20/15 10/3 20/15 50 0.22 Example 2 20/18 10/5 20/18 50 0.23 Example 3 11/10 3/3 11/10 25 0.12 Example 4 10/18 5/4 10/18 25 0.13 Example 5 22/20 6/5 22/20 50 0.24 Comparative Example 1 Porous polyethylene film 95 0.10 Comparative Example 2 Tyvek nonwoven 45 0.14 Comparative Example 3 25/20 - 25/20 50 0.22 Comparative Example 4 20/15 10/6 20/15 50 0.22 Comparative Example 5 12/10 2/3 13/10 25 0.12

TABLE 2

division The tensile strength
(N / 5cm)
MD / CD Elongation
(%)
MD / CD Phosphorus strength
(Kgf)
MD Bursting strength
(kPa) Water pressure
(mmH ₂ O) Breathable
(g / m ² · day) Aeration
(ccs) Example 1 160/120 75/78 2.2 560 90 110 26 Example 2 164/122 74/77 2.3 575 50 140 38 Example 3 38/21 74/78 0.6 220 40 160 46 Example 4 34/17 62/65 0.6 223 35 170 48 Example 5 174/131 79/83 2.5 610 45 160 32 Comparative Example 1 4.2 / 2.3 46/170 0.2 / 0.4 500 140 35 Not ventilated Comparative Example 2 45/40 10/13 1.1 / 0.8 600 110 80 Not ventilated Comparative Example 3 167/131 76/77 2.5 620 zero 200 40 Comparative Example 4 161/122 78/78 2.2 560 20 115 48 Comparative Example 5 39/23 65/63 0.6 225 18 170 56

Referring to Tables 1 and 2 above, Example 1 having a laminated structure of a spunbond nonwoven fabric layer / meltblown nonwoven fabric layer / spunbond nonwoven fabric layer, each nonwoven fabric layer having a weight per predetermined unit area and an average diameter of filament fibers The composite nonwoven fabric of 5 to 5 has excellent mechanical properties, such as high strength and low elongation, in comparison with the porous film of Comparative Example 1, which is conventionally mainly used as a coating material for automobiles. It is confirmed that it has a characteristic. In addition, the composite nonwoven fabrics of Examples 1 to 5 are equivalent to or better than Comparative Example 1 in terms of water pressure (water resistance) and moisture permeability, and thus can be very preferably used as a material for protecting the coating film surface of an automobile from external contamination or moisture. It is confirmed.

In addition, even in comparison with Comparative Example 2, the composite nonwoven fabric of Examples 1 to 5 exhibits excellent mechanical properties compared to Comparative Example 2 having a very high manufacturing cost, and equivalent or rather excellent water resistance and moisture permeability, such an example It is confirmed that the composite nonwoven fabric of 1 to 5 can be provided at low cost to provide a film protective cover for automobiles having excellent physical properties.

And, when comparing Examples 1 to 5 and Comparative Examples 3 to 5, made of only a spunbond nonwoven fabric (Comparative Example 3), or when the average diameter of the filament fibers according to the present invention or the weight range per unit area of each nonwoven fabric layer (Comparative Examples 4 and 5) It is confirmed that the surface of the automobile coating film cannot be effectively protected from moisture or the like due to a significant decrease in water resistance (water pressure) or strength. In contrast, the composite nonwoven fabrics of Examples 1 to 5 exhibit excellent waterproofness, moisture permeability, and mechanical properties, and thus, it is confirmed that the composite nonwoven fabric can be very preferably used as a material for protecting a film of automobiles.

Claims (10)

At least two spunbond nonwoven layers, each consisting of filament fibers having an average diameter of 10 to 30 μm, each having a weight per unit area of 10 to 30 gr / m ² ; And Formed between the two or more spunbond nonwoven layers, comprising filament fibers having an average diameter of 1 to 5 μm, each comprising one or more meltblown nonwoven layers having a weight per unit area of 3 to 15 gr / m ² . Composite nonwoven fabric for automotive film protection. The composite nonwoven fabric of claim 1, wherein the spunbond nonwoven layer comprises one or more filament fibers selected from the group consisting of polyester filament fibers, polypropylene filament fibers, and polyamide filament fibers. The method of claim 1, wherein the meltblown nonwoven layer is polyester filament fiber, polypropylene filament fiber, polyurethane filament fiber, polyvinyl difluoride (PVDF) filament fiber and polymethyl methacrylate (PMMA) A composite nonwoven fabric comprising at least one filament fiber selected from the group consisting of filament fibers. The composite nonwoven of claim 1 having a weight per unit area of 24 to 60 gr / m ² . The composite nonwoven fabric of claim 1, having an average thickness of 0.10 to 0.30 mm. The composite nonwoven fabric of claim 1, wherein the meltblown nonwoven layer consists of filament fibers having an average diameter of 4 to 5 μm, each having a weight per unit area of 4 to 15 gr / m ² . Spunbonding the first polymer to form a first filament fiber having an average diameter of 10 to 30 μm; Meltblown spinning the second polymer to form a second filament fiber having an average diameter of 1 to 5 μm; Stacking them in the form of a web in the order of the first filament fibers, the second filament fibers and the first filament fibers; And The method of manufacturing a composite nonwoven fabric of claim 1 comprising thermally bonding the filament fibers laminated in the web form. The method of claim 7, wherein the first polymer is at least one selected from the group consisting of polyester-based polymers, polypropylene-based polymers and polyamide-based polymers, The second polymer is a composite nonwoven fabric selected from the group consisting of polyester polymers, polypropylene polymers, polyurethane polymers, polyvinyl difluoride (PVDF) polymers and polymethyl methacrylate (PMMA) polymers Method of preparation. 8. The method of claim 7, wherein the thermal bonding step comprises pressing the filament fibers with an emboss roll of 150 to 200 ° C. The coating film protection cover of a vehicle comprising the composite nonwoven fabric of claim 1.