KR101736012B1 - Water-repellent film having water vapor permeable path and dehumidifier having the same - Google Patents

Abstract

Water-repellent water-repellent film. The moisture-permeable water-repellent film includes a hydrophobic polymer matrix, nanoparticle clusters provided in the hydrophobic polymer matrix. Each of the nanoparticle clusters has a plurality of nanoparticles, and the nanoparticles have a surface modifier represented by the general formula (3), a surface modifier represented by the general formula (4), and a hydrophilic functional group capable of hydrogen bonding on the surface thereof. A moisture-permeable path is formed in the cluster.

Description

TECHNICAL FIELD [0001] The present invention relates to a water-repellent film having a moisture permeable path and a dehumidifier,

The present invention relates to an inorganic-polymer composite film, and more particularly, to a water-repellent film having a moisture-permeable path.

Water-repellent films that do not pass water molecules have been used in many industries. Particularly, the water-repellent film selectively passing water molecules has been expanded in its application range. Typically, Gore-Atx is a film formed with a high density of holes of several tens of microns in Teflon. It has water-repellent characteristics, but it has moisture permeability that permeates water vapor molecules. It is a portable device ) To various fields.

 However, since the above-mentioned film is permeable to air through the hole for moisture permeation, it can not be used in a field requiring the ability to selectively transmit water vapor without permeating air.

Accordingly, an object of the present invention is to provide a moisture-permeable water-repellent film which selectively transmits water vapor in moist air without permeating water and air in liquid form.

The technical objects of the present invention are not limited to the technical matters mentioned above, and other technical subjects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a moisture-permeable water-repellent film. The moisture-permeable water-repellent film includes a hydrophobic polymer matrix, nanoparticle clusters provided in the hydrophobic polymer matrix. Each of the nanoparticle clusters has a plurality of nanoparticles, and the nanoparticles have a surface modifier represented by the following formula (3), a surface modifier represented by the following formula (4), and a hydrophilic functional group capable of hydrogen bonding on the surface thereof. A moisture-permeable path is formed in the cluster.

(3)

X ₁ and X ₃ are independently hydrogen, an alkyl group having 1 to 2 carbon atoms, a hydroxy group, an alkoxy group having 1 to 2 carbon atoms, or a halo group, b is an integer of 0 or 1, a + b + c is an integer of 3 to 10, T ₁ is a functional group containing a phenyl group at the terminal, and * is a bond to the surface of the nanoparticle.

[Chemical Formula 4]

X ₄ and X ₆ independently represent hydrogen, an alkyl group having 1 to 2 carbon atoms, a hydroxy group, an alkoxy group having 1 to 2 carbon atoms, or a halo group, e is an integer of 0 or 1, d + e + f is an integer of 3 to 10, T ₂ is a functional group having an amine group at the terminal, a functional group containing an epoxy group at the terminal, or an alkyl group having 5 to 15 carbon atoms, ≪ / RTI >

The hydrophilic functional group may be a hydroxyl group (-OH), a carboxy group (-COOH), a thiol group (-SH), or an amine group (-NH2).

T ₁ is an anilinyl group, and T ₂ is an alkylene diamine group having 2 to 3 carbon atoms, a glycidyloxy group, or an alkyl group having 5 to 15 carbon atoms. As an example, T ₁ may be an anilinyl group, T ₂ may be a glycidyloxy group, or an alkyl group having 5 to 15 carbon atoms. Specifically, the surface modifier represented by the above-mentioned general formula (3) is represented by * -O-Si (OCH ₃ ) ₂ - (CH ₂ ) ₃ -T ₁ (wherein T ₂ is an anilinyl group) reformer is _{* -O-Si (OCH 3)} 2 - may be a (CH _{2) 3} -T ₂ (wherein, T ₂ is the time being dilok glycidyl). In another example, the surface modifier represented by the above-mentioned general formula ( ₃ ) is * -O-Si (OCH ₃ ) ₂ - (CH ₂ ) ₃ -T ₁ wherein T ₂ is an anilyl group, The surface modifier may be * -O-Si (OCH ₃ ) ₂ - (CH ₂ ) ₁₅ -CH ₃ .

The nanoparticles containing the surface modifiers and the hydrophilic functional groups may be contained in an amount of 7 to 15 parts by weight based on 100 parts by weight of the hydrophobic polymer in the hydrophobic polymer matrix.

According to an aspect of the present invention, there is provided a method of manufacturing a water-repellent water-repellent film. First, nanoparticles having a hydrophilic functional group on the surface thereof are surface-modified using silane represented by the following formula (1) and silane represented by the following formula (2) to form surface-modified nanoparticles. The surface-modified nanoparticles, the hydrophobic polymer, and the solvent are mixed to form a coating solution. The coating liquid is used to form a film.

[Chemical Formula 1]

In Formula 1, X ₂ is a hydroxyl group, an alkoxy group having 1 to 2, or halo group, and, X ₁ and X ₃ are independently selected from hydrogen, an alkyl group, a hydroxyl group having 1 to 2 carbon atoms, 1 B is an integer of 0 or 1, a + b + c is any integer of 3 to 10, and T ₁ is a functional group containing a phenyl group at the terminal.

(2)

In Formula 2, X ₅ is a hydroxyl group, a carbon number is 1 to an alkoxy group, or a halo group of the 2, X ₄ and X ₆ are independently selected from hydrogen, C 1 -C 2 alkyl group, a hydroxyl group of a carbon number of 1 E is an integer of 0 or 1, d + e + f is any integer of 3 to 10, T ₂ is a functional group having an amine group at the terminal, an epoxy group , Or an alkyl group having 5 to 15 carbon atoms.

In one example, the silane represented by Formula 1 is N- [3-trimethoxysilyl) propyl] aniline, and the silane represented by Formula 2 is (3-glycidyloxypropyl) trimethoxysilane have. In another example, the silane represented by Formula 1 may be N- [3-trimethoxysilyl) propyl] aniline, and the surface modifier represented by Formula 2 may be hexadecyltrimethoxysilane. Meanwhile, the surface-modified nanoparticles may be contained in an amount of 7 to 15 parts by weight based on 100 parts by weight of the hydrophobic polymer.

The solvent may be a mixed solution of toluene and DMF (dimethylformamide). In addition, surface modification of the nanoparticles can be carried out in a mixed solvent of toluene and ethanol.

According to another aspect of the present invention, there is provided a dehumidifying apparatus including the moisture-permeable water-repellent film.

The moisture-permeable water-repellent film according to an embodiment of the present invention may exhibit water repellency due to a hydrophobic polymer matrix, and a moisture-permeation path is formed by hydrogen bonds between hydrophilic functional groups between the clustered nanoparticles, Can be improved.

1 is a schematic view showing a method of manufacturing a water-repellent film according to an embodiment of the present invention.
2 is a cross-sectional view of a water-repellent film according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms.

1 is a schematic view showing a method of manufacturing a water-repellent film according to an embodiment of the present invention. small

Referring to FIG. 1, nanoparticles 21 are provided. The nanoparticles 21 may be metal oxide particles such as silica and titania, for example, inorganic particles having a hydrophilic functional group (Y) on the surface thereof. The nanoparticles 21 may have a diameter of several nanometers to several hundreds of nanometers, for example, a diameter of 5 to 500 nanometers. The hydrophilic functional group (Y) may be, for example, a hydroxyl group (-OH), a carboxyl group (-COOH), a thiol group (-SH), an amine group (-NH2) In one example, the hydrophilic functional group (Y) may be a hydroxyl group (-OH).

The surface of the nanoparticles 21 can be surface-treated using two different types of silanes, that is, a first silane and a second silane.

The first silane may be represented by the following formula (1).

[Chemical Formula 1]

In Formula 1, X ₂ may be a hydroxyl group, an alkoxy group having 1 to 2 carbon atoms, or a halo group, and X ₁ and X ₃ are each independently selected from the group consisting of hydrogen, an alkyl group having 1 to 2 carbon atoms, B is an integer of 0 or 1, and a + b + c may be an integer of 3 to 10. < EMI ID = 1.0 > The halo group may be a chloro group. T ₁ may be an aromatic group, specifically a phenyl group-containing functional group at the terminal. More specifically, T ₁ may be a phenyl group, an anilinyl group, or a phenoxy group.

Specifically, the first silane may be selected from the group consisting of N- [3- (trimethoxysilyl) propyl] aniline, 3-phenoxypropyldimethylchlorosilane, 3-phenoxypropylmethyldichlorosilane, 3-phenoxypropyltrichlorosilane, 1-phenyl-1- (methyldichlorosilyl) butane, butane. More specifically, the first silane may be N- [3- (trimethoxysilyl) propyl] aniline.

The second silane may be represented by the following general formula (2).

(2)

In Formula 2, X ₅ is a hydroxyl group, an alkoxy group having 1 to 2, or halo date may, X ₄ and X ₆ is hydrogen, an alkyl group, a hydroxyl group having a carbon number of 1 to 2, regardless of each other, the number of carbon atoms E is an integer of 0 or 1, and d + e + f is an integer of 3 to 10, specifically, an integer of 3 to 6, for example. The halo group may be a chloro group. T ₂ may be a functional group containing an amine group at the terminal, a functional group containing an epoxy group at the terminal, or an alkyl group having 5 to 15 carbon atoms.

When T ₂ is a functional group containing an amine group, the functional group containing an amine group may be an amine group or an alkylenediamine group having 2 to 3 carbon atoms. In this case, the second silane is selected from the group consisting of 3- [2- (2-aminoethylamino) ethylamino] propyltrimethoxysilane, N- [3- (trimethoxysilyl) propyl] ethylenediamine, Propyl) trimethoxysilane. More specifically, the second silane may be N- [3- (trimethoxysilyl) propyl] ethylenediamine.

When T ₂ is a functional group containing an epoxy group, the functional group containing the epoxy group may be an epoxy group, a glycidyl group, or a glycidyloxy group. In this case, the second silane may be selected from the group consisting of 3-epoxypropyltrimethoxysilane, 3-epoxypropyltriethoxysilane, 4-epoxybutyltrimethoxysilane, 4-epoxybutyltriethoxysilane, Lt; / RTI > trimethoxysilane.

When T ₂ is an alkyl group having 5 to 15 carbon atoms, the second silane may be hexadecyltrimethoxysilane.

X ₂ of the first silane and X ₅ of the first silane may form a siloxane bond (25) by reacting with the hydroxy group as one example of the hydrophilic functional group (Y) on the surface of the nanoparticle (21). As a result, on the surface of the nanoparticles 20 surface-modified with the first silane and the second silane, a surface reformer according to the following Chemical Formula 3 and a surface reformer according to Chemical Formula 4 below can be placed.

(3)

In Formula 3, X ₁ , X ₃ , a, b, c, and T ₁ are as defined in Formula 1, and * means bonding to the surface of the nanoparticles.

[Chemical Formula 4]

In Formula 4, X ₄ , X ₆ , d, e, f, and T ₂ are as defined in Formula 2, and * means bonding to the surface of the nanoparticles.

Wherein the first silane to the second silane is both hydrophobic functional groups _{(23) - (CH 2)} a - (NH) b - (CH 2) c - or _{- (CH 2) d - (} NH) e - (CH ₂ ) It can show hydrophobicity by containing _f - in the molecular structure. Also, after the first silane having a relatively large terminal functional group is first reacted with the nanoparticles (21), the second silane having an amine group or an epoxy group or an alkyl group, which is relatively small terminal functional groups, is reacted with the first silane- Due to the steric hindrance caused by the first silane, the second silane reacts with all of the hydrophilic functional groups (Y), specifically the hydroxyl groups (-OH) remaining after reacting with the first silane, The hydrophilic functional group (Y), specifically, the hydroxyl group (-OH) may remain on the surface of the nanoparticle (20) after the surface modification with the second silane. Therefore, the hydrophilic functional group (Y) may be provided simultaneously with the hydrophilic functional group (Y) on the surface of the nanoparticles (21) surface-modified with the first silane and the second silane, and the hydrophilic functional group (Y) Can be formed.

The surface treatment of the surface of the nanoparticles 21 using two different kinds of silanes may be performed in the first solvent. Specifically, after the nanoparticles 21 are dispersed in the first solvent to obtain a nanoparticle dispersion, the first silane may be added to the surface to modify the surface, and then the second silane may be added to modify the surface. The first solvent may be a solvent for the mixing of toluene and ethanol. As a result, in the nanoparticle dispersion, the nanoparticles 21 can be uniformly dispersed without agglomeration, and surface modification using silane can proceed uniformly. Thereafter, the surface modified nanoparticles 20 can be obtained by filtering the resultant.

Thereafter, a coating solution 10a containing the surface-modified nanoparticles 20, the hydrophobic polymer, and the second solvent can be prepared. The second solvent may be a mixed solution of toluene and DMF (dimethylformamide). At this time, the hydrophobic polymer may be polyurethane, polyolefin, polycarbonate, or PET (polyethylene terephthalate).

At this time, the surface-modified nanoparticles 20 may be contained in an amount of about 7 to 15 parts by weight, specifically 8 to 12 parts by weight, based on 100 parts by weight of the hydrophobic polymer. In this case, the surface-modified nanoparticles 20 may form a micron-sized cluster in the coating solution 10a. Specifically, when only a hydrophilic functional group is disposed on the surface of the nanoparticles 20, the nanoparticles 20 will not be dispersed at all in the coating liquid 10a, The nanoparticles 20 will be completely dispersed in the coating liquid 10a when only the hydrophobic functional groups 23 are disposed on the surface of the nanoparticles 20a. However, in this embodiment, the surface-modified nanoparticles 20 having the hydrophilic functional group 23 in addition to the hydrophilic functional group on the surface are dispersed to a certain extent by the hydrophobic functional group 23 in the coating liquid 10a However, it is not completely dispersed due to the hydrophilic functional group, and some aggregation occurs due to the hydrophilic functional group to form micron sized clusters. At this time, the hydrophilic functional groups may be bonded by a hydrogen bond to form the nanoparticle cluster.

In the dispersion process for forming the nanoparticle clusters, mechanical dispersion may be performed so that air is not contained in the clusters.

Thereafter, a coating liquid 10a having clusters of the nanoparticles 20 formed thereon may be applied to form a water repellent film.

2 is a cross-sectional view of a water-repellent film according to an embodiment of the present invention.

Referring to FIG. 2, the water-repellent film may have a moisture-permeable path in the hydrophobic polymer matrix 10. Specifically, the clusters of the surface-modified nanoparticles 20 are partially disposed in the hydrophobic polymer matrix 10, so that the entire surface of the water-repellent film can maintain hydrophobicity, so that the water-repellent property, that is, And it is also possible to maintain the mechanical properties of the film even in the case of contact with water or other water vapor.

The nanoparticles 20 have hydrophobic functional groups 23 on its surface as well as hydrogen bonding capable hydrophilic functional groups. Within such clusters, the nanoparticles 20 can be agglomerated by hydrogen bonding between the hydrophilic functional groups on its surface. Such a hydrogen bond can form a moisture permeation path between the nanoparticles 20. [ Also, when the external water vapor is absorbed, the path of the moisture permeation path is increased due to the nature of the hydrogen bond being straightened, so that the water vapor can be discharged more quickly.

Therefore, the water-repellent film according to the present embodiment can exhibit water repellency due to the hydrophobic polymer matrix 10, and the moisture-permeable path is formed by the hydrogen bonding between the hydrophilic functional groups between the clustered nanoparticles 10 . Such a water-repellent film can rapidly discharge water vapor through a moisture-permeable path formed by hydrogen bonding, so that condensation of water vapor on the surface can be prevented. On the other hand, a gas other than the hydrophilic gas, that is, the air, may be difficult to permeate through the moisture-permeable path. In addition, pore formation in the water repellent film can be minimized by performing mechanical dispersion such that no air is contained between the clustered nanoparticles 10 in the manufacturing process. Therefore, the water-repellent film according to the present embodiment is advantageous in that only water vapor, which is a hydrophilic gas, can selectively permeate while suppressing transmission of liquid and air such as water.

The thickness of such a water-repellent film may have a micrometer size, and may be several to several hundreds of micrometers, specifically, 1 to 100 micrometers. The water-repellent film may be a water-repellent water-repellent membrane used in a dehumidifying device or a cooling device.

Hereinafter, preferred examples will be given to facilitate understanding of the present invention. It should be understood, however, that the following examples are for the purpose of promoting understanding of the present invention and are not intended to limit the scope of the present invention.

Inorganic-polymer composite film Production Example 1

A silica dispersion was prepared by mixing 10 g of hydrophilic silica nanoparticles, 600 g of toluene and 60 g of ethanol in a 1 L double jacketed reaction vessel. A circulator was attached to the reaction vessel, and the solution was dispersed for 30 minutes using a 130 W horn type ultrasonic machine while maintaining the temperature of the solution at 70 占 폚. To the silica dispersion, 2.1 g of N- [3-trimethoxysilyl) propyl] aniline (TMSA) was added and sonicated for about 30 minutes with stirring to obtain 0.9 g (Trimethoxysilyl) propyl] ethylenediamine, TMDA) was further added to the surface of the silica, and the surface of the silica was modified by ultrasonication for 2 hours. The TMSA and TMDA-modified silica (TMSA / TMDA-Silica) dispersion was washed by filtration to remove unreacted silane. The washed TMSA / TMDA-silica was dispersed in toluene containing 10 wt% ethanol.

To a 100 ml beaker were mixed 3 g of TMSA / TMDA-silica dispersed in 15 g toluene and 15 g of DMF (dimethylformamide). 30 g of hydrophobic polyurethane was added to the silica solution, stirred for 30 minutes, and treated with a homogenizer for 10 minutes to prepare a coating solution. The coating solution was coated on a release film and dried in a hot air oven at 120 캜 for about 1 hour to prepare a silica-polyurethane film having a thickness of about 30 탆.

Inorganic-Polymer Composite Film Production Example 2

An inorganic-polymer composite film was prepared in the same manner as in Preparation Example 1 of the inorganic-polymer composite film except that 1.5 g of TMSA / TMDA-silica was used instead of 3 g of TMSA / TMDA-silica.

Inorganic-Polymer Composite Film Production Example 3

Except that 0.9 g of hexadecyltrimethoxysilane (HDTS) was used instead of 0.9 g of N- [3- (trimethoxysilyl) propyl] ethylenediamine (TMDA). An inorganic-polymer composite film was prepared in the same manner as in Production Example 1. [

Inorganic-polymer composite film Production Example 4

0.9 g of (3-glycidyloxypropyl) trimethoxysilane (GTMS) was used instead of 0.9 g of N- [3- (trimethoxysilyl) propyl] ethylenediamine (TMDA) An inorganic-polymer composite film was prepared in the same manner as in Preparation Example 1 of the inorganic-polymer composite film.

Inorganic-polymer composite film Production Example 5

Instead of modifying the silica surface with 2.1 g N- [3-trimethoxysilyl) propyl] aniline (TMSA) and 0.9 g N- [3- (trimethoxysilyl) propyl] ethylenediamine (TMDA) Except that TMSA-silica (TMSA-silica) modified with TMSA, obtained by modifying the silica surface by ultrasonication for 2 hours with stirring, was added to the silica dispersion in an amount of 3 g of TMSA, An inorganic-polymer composite film was prepared in the same manner as in Production Example 1 of Film.

Comparative Example

A mixed solution of 30 g of hydrophobic polyurethane and 30 g of DMF was prepared in a 100 ml beaker. The solution was coated on a PET release film and dried in a hot air oven at 120 캜 for about 1 hour to prepare a polyurethane film having a thickness of about 30 탆.

Example of moisture permeability measurement

One of the films according to Experimental Examples 1 to 5 and Comparative Example was mounted in a moisture-permeable cup conforming to the standard of ASTM-F1249 and stored in a hot-air oven at 60 DEG C or normal pressure or in a vacuum oven at 30 DEG C and 0.26 atm for 1 hour After storage for 24 hours, the weight was measured. The weight change was obtained from the measured weight and the moisture permeability was calculated using this.

Air permeability measurement example

One of the films according to Experimental Examples 1 to 5 was mounted at the inlet of the low-pressure vessel having 0.8 atmospheric pressure at room temperature, and the change in pressure inside the vessel was measured for 3 days.

Table 1 below shows the moisture permeability and dry air permeability for the films according to Experimental Examples 1 to 5 and Comparative Examples.

In film
For 100 parts by weight of the polymer
Silica weight part Surface modifier
Water vapor permeability (g / m ² / hr) Air permeability
(Pressure change) Condition: 60 캜, atmospheric pressure Conditions: 38 DEG C, 0.26 atmosphere Experimental Example 1 10 TMSA / TMDA 83.8 - ± 0.02 atm Experimental Example 2 5 TMSA / TMDA 52.1 - Experimental Example 3 10 TMSA / HDTS 115.9 - Experimental Example 4 10 TMSA / GTMS 101.1 135.4 Experimental Example 5 10 TMDA 53.7 87.3 Comparative Example 1 - - 8.3 -

Referring to Table 1, it can be seen that the films according to Experimental Examples 1 to 5 and Comparative Example 1 exhibited almost no air permeation because the pressure change in the vessel was ± 0.02 atm.

In the case of the moisture permeability, it can be seen that the polyurethane film containing no silica (Comparative Example 1) is hardly breathable. On the other hand, the composite films (Experimental Examples 1, 3 and 4) containing silica with surface modified with two silanes as compared to the composite film containing silica and surface-modified with a single silane (Experimental Example 5) showed an improved moisture permeability . However, even when the surface was modified with two silanes, the water vapor permeability was lower than that of the composite film surface-modified with single silane (Experimental Example 5) in the case where the weight ratio of silica to 100 parts by weight of the polymer was only 5 (Experimental Example 3). From these results, it can be understood that it is preferable to use at least 7 parts by weight or more of silica relative to 100 parts by weight of the polymer in order to produce a composite film using silica modified with two silanes.

In addition, the two silica-modified silica-modified surfaces exhibited better moisture permeability compared to TMSA / HDTS (Experimental Example 3) and TMSA / GTMS (Experimental Example 4) Respectively.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the present invention is not limited to the disclosed exemplary embodiments, and various changes and modifications may be made by those skilled in the art without departing from the scope and spirit of the invention. Change is possible.

Claims (17)

Hydrophobic polymer matrix;
Nanoparticle clusters comprising a plurality of nanoparticles provided in the hydrophobic polymer matrix,
Wherein the nanoparticle has a surface modifier represented by the following formula (3), a surface modifier represented by the following formula (4), and a hydrophilic functional group capable of hydrogen bonding,
A moisture-permeable water-repellent film having a moisture-permeable path formed in the cluster:
(3)

In Formula 3,
X ₁ and X ₃ independently represent hydrogen, an alkyl group having 1 to 2 carbon atoms, a hydroxy group, an alkoxy group having 1 to 2 carbon atoms, or a halo group,
b is an integer of 0 or 1, a + b + c is any integer of 3 to 10,
T ₁ is a functional group containing a phenyl group at the terminal, * is a bond to the surface of the nanoparticle,
[Chemical Formula 4]

In Formula 4,
X ₄ and X ₆ independently represent hydrogen, an alkyl group having 1 to 2 carbon atoms, a hydroxy group, an alkoxy group having 1 to 2 carbon atoms, or a halo group,
e is an integer of 0 or 1, d + e + f is an integer of 3 to 10,
T ₂ is a functional group having an amine group at the terminal, a functional group containing an epoxy group at the terminal, or an alkyl group having 5 to 15 carbon atoms, and * means bonding to the surface of the nanoparticle. The method according to claim 1,
Wherein the hydrophilic functional group is a hydroxyl group (-OH), a carboxyl group (-COOH), a thiol group (-SH), or an amine group (-NH2). The method according to claim 1,
T ₁ is an anilinyl group, and T ₂ is an alkylenediamine group having 2 to 3 carbon atoms, a glycidyloxy group, or an alkyl group having 5 to 15 carbon atoms. The method of claim 3,
T ₁ is an anilinyl group, T ₂ is a glycidyloxy group, or an alkyl group having 5 to 15 carbon atoms. 5. The method of claim 4,
Wherein the surface modifier represented by Formula 3 is represented by * -O-Si (OCH ₃ ) ₂ - (CH ₂ ) ₃ -T ₁ (wherein T ₂ is an anilyl group) -O-Si (OCH ₃ ) ₂ - (CH ₂ ) ₃ -T ₂ (wherein T ₂ is a glycidyloxy group). 5. The method of claim 4,
Wherein the surface modifier represented by Formula 3 is represented by * -O-Si (OCH ₃ ) ₂ - (CH ₂ ) ₃ -T ₁ (wherein T ₂ is an anilyl group) _{-O-Si (OCH 3) 2} - (CH 2) 15 -CH 3 a moisture-permeable water-repellent film. The method according to claim 1,
Wherein the nanoparticles containing the surface modifiers and the hydrophilic functional groups are contained in an amount of 7 to 15 parts by weight based on 100 parts by weight of the hydrophobic polymer in the hydrophobic polymer matrix. Surface-modifying nanoparticles having a hydrophilic functional group on the surface by using a silane represented by the following formula (1) and a silane represented by the following formula (2) to form surface-modified nanoparticles;
Mixing the surface-modified nanoparticles, the hydrophobic polymer, and the solvent to form a coating liquid;
And forming a film by using the coating liquid.
[Chemical Formula 1]

In Formula 1,
X ₂ is a hydroxyl group, an alkoxy group having 1 to 2 carbon atoms, or a halo group,
X ₁ and X ₃ independently represent hydrogen, an alkyl group having 1 to 2 carbon atoms, a hydroxy group, an alkoxy group having 1 to 2 carbon atoms, or a halo group,
b is an integer of 0 or 1, a + b + c is any integer of 3 to 10,
T ₁ is a functional group containing a phenyl group at the terminal,
(2)

In Formula 2,
X ₅ is a hydroxyl group, an alkoxy group having 1 to 2 carbon atoms, or a halo group,
X ₄ and X ₆ independently represent hydrogen, an alkyl group having 1 to 2 carbon atoms, a hydroxy group, an alkoxy group having 1 to 2 carbon atoms, or a halo group,
e is an integer of 0 or 1, d + e + f is an integer of 3 to 10,
T ₂ is a functional group containing an amine group at the terminal, a functional group containing an epoxy group at the terminal, or an alkyl group having 5 to 15 carbon atoms. 9. The method of claim 8,
Wherein the hydrophilic functional group is a hydroxyl group (-OH), a carboxyl group (-COOH), a thiol group (-SH), or an amine group (-NH2). 9. The method of claim 8,
T ₁ is an anilinyl group, and T ₂ is an alkylenediamine group having 2 to 3 carbon atoms, a glycidyloxy group, or an alkyl group having 5 to 15 carbon atoms. 11. The method of claim 10,
T ₁ is an anilinyl group, and T ₂ is a glycidyloxy group or an alkyl group having 5 to 15 carbon atoms. 12. The method of claim 11,
Wherein the silane represented by Formula 1 is N- [3-trimethoxysilyl) propyl] aniline, and the silane represented by Formula 2 is (3-glycidyloxypropyl) trimethoxysilane . 12. The method of claim 11,
Wherein the silane represented by Formula 1 is N- [3-trimethoxysilyl) propyl] aniline, and the surface modifier represented by Formula 2 is hexadecyltrimethoxysilane. 9. The method of claim 8,
Wherein the surface-modified nanoparticles are contained in an amount of 7 to 15 parts by weight based on 100 parts by weight of the hydrophobic polymer. 9. The method of claim 8,
Wherein the solvent is a mixed solution of toluene and DMF (dimethylformamide). 9. The method of claim 8,
Wherein the surface modification of the nanoparticles is performed in a mixed solvent of toluene and ethanol. A dehumidifying device comprising the moisture-permeable water-repellent film of claim 1.

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