阅读说明：本技术 用于车灯的通风构件及其制造方法 (Ventilation member for vehicle lamp and method of manufacturing the same ) 是由 李振源 李映昊 曺俊根 朴景泽 金亨周 沈相烨 曺晟弼 于 2021-03-22 设计创作，主要内容包括：提供了一种用于车灯的通风构件。所述通风构件包括：纳米纤维膜,复合粘附层,其堆叠在纳米纤维膜的一个表面上,以及通风结构,其设置在复合粘附层的中心部分上,并与纳米纤维膜接触。所述复合粘附层包括与纳米纤维膜接触的丙烯酸粘附层,以及设置在丙烯酸粘附层的一个表面上的硅基粘附层。所述丙烯酸粘附层与纳米纤维膜接触,丙烯酸粘附层以30微米或更深的深度渗入到纳米纤维膜中。所述用于车灯的通风构件具有1.0巴或更大的水压抗性。(A ventilation member for a vehicle lamp is provided. The ventilation member includes: the nanofiber membrane includes a nanofiber membrane, a composite adhesive layer stacked on one surface of the nanofiber membrane, and a ventilation structure disposed on a central portion of the composite adhesive layer and in contact with the nanofiber membrane. The composite adhesive layer includes an acrylic adhesive layer in contact with the nanofiber membrane, and a silicon-based adhesive layer disposed on one surface of the acrylic adhesive layer. The acrylic adhesive layer is in contact with the nanofiber membrane, and the acrylic adhesive layer penetrates into the nanofiber membrane to a depth of 30 microns or more. The ventilation member for a vehicle lamp has a water pressure resistance of 1.0 bar or more.)

1. A ventilation member for a vehicle lamp, the ventilation member comprising:

a nanofiber membrane;

a composite adhesive layer stacked on one surface of the nanofiber membrane; and

a venting structure disposed on a central portion of the composite adhesive layer and in contact with the nanofiber membrane,

wherein the composite adhesive layer comprises an acrylic adhesive layer in contact with the nanofiber membrane, and a silicon-based adhesive layer disposed on one surface of the acrylic adhesive layer,

the acrylic adhesive layer is in contact with the nanofiber membrane,

the acrylic adhesion layer penetrates into the nanofiber membrane to a depth of 30 microns or more, an

The ventilation member for a vehicle lamp has a water pressure resistance of 1.0 bar or more.

2. The venting member of claim 1, wherein the nanofiber membrane is manufactured by hot-melting a nanofiber web formed by electrospinning a spinning solution comprising polyvinylidene fluoride.

3. The venting member of claim 1, wherein the nanofiber membrane has a fiber diameter in the range of 50-500 nanometers and a porosity in the range of 10-80%.

4. The venting member of claim 1, wherein the acrylic adhesive layer penetrates into the nanofiber membrane at a depth ranging from 30-80 microns.

5. The venting member of claim 1, wherein the nanofiber membrane has a thickness in the range of 30-150 microns, and

the thickness of the composite adhesive layer ranges from 50 microns to 300 microns.

6. The ventilation member according to claim 1, wherein a thickness ratio between the thickness of the nanofiber membrane and the total thickness of the silicon-based adhesive layer and the acrylic adhesive layer is in a range of 1:0.3-1: 0.8.

7. The ventilation member according to claim 1, wherein a thickness ratio between the silicon-based adhesive layer and the acrylic adhesive layer is in a range of 1:0.5-1: 4.

8. The ventilation member of claim 1, wherein the composite adhesive layer further comprises a carrier layer disposed between the acrylic adhesive layer and the silicon-based adhesive layer.

9. The venting member of claim 1, wherein the composite adhesive layer is formed over an area that occupies 55-80% of the entire area of the one surface of the nanofiber membrane.

10. The venting member of claim 1, wherein the nanofiber membrane has an air permeability of 25 liters/hour or greater and a water vapor permeability of greater than 850 milligrams of water vapor/day at a pressure of 70 millibars.

11. A manufacturing method of a ventilation member for a vehicle lamp, the manufacturing method comprising:

forming a composite adhesive layer by heat laminating the composite adhesive member to one surface of the nanofiber membrane,

wherein the composite adhesive member comprises an acrylic adhesive layer in contact with the nanofiber membrane, and a silicon-based adhesive layer disposed on one surface of the acrylic adhesive layer, and

during the thermal lamination, the acrylic adhesion layer penetrates into the nanofiber membrane to a depth of 30 microns or more.

12. The manufacturing method according to claim 11, wherein the heat fusion is performed at a temperature in the range of 120 ℃ to 140 ℃.

13. The manufacturing method according to claim 11, wherein the nanofiber membrane is formed by forming a nanofiber web formed by electrospinning a spinning solution containing polyvinylidene fluoride and thermally melting the nanofiber web.

14. The method of manufacturing of claim 13, wherein the thermal lamination is performed at a temperature in a range of 60-150 ℃.

Technical Field

Exemplary embodiments of the present disclosure relate to a ventilation member for a vehicle lamp and a method of manufacturing the same.

Background

The lamp has an open structure that can be ventilated to cope with an increase in temperature and air pressure inside the lamp when the lamp is turned on. Therefore, condensation may occur in the lamp due to the difference in temperature and humidity between the outside and the inside of the lamp.

When condensation that occurs repeatedly in the lamp is not solved, lamp performance may be impaired, or electrical insulation of the lamp may be weakened, thereby adversely affecting safety of occupants in the vehicle. Thus, the vehicle lamp has a ventilation member, such as a ventilation patch, connected thereto. The ventilation member serves to prevent condensation, maintain pressure balance between the inside and the outside of the lamp, and prevent the entry of external impurities or moisture. For example, a ventilation member such as a ventilation patch may be attached to a ventilation structure provided on one side of the vehicle lamp.

However, such ventilation members in the related art are insufficient in adhesion to the vehicle lamp and have low durability and water pressure resistance. Therefore, external moisture can easily penetrate into the ventilation member even under low water pressure, thereby reducing durability and performance of the lamp.

Korean patent application No. 10-1812784 (patented at 27.12.2017 entitled "waterproof and ventilated seat and method for manufacturing the same") discloses background art related to the present disclosure.

Disclosure of Invention

An object of the present disclosure is to provide a ventilation member for a vehicle lamp, which has excellent durability and water pressure resistance due to excellent adhesion between a lamp material and a nanofiber membrane.

Another object of the present disclosure is to provide a ventilation member for a vehicle lamp, which has excellent water resistance, dust resistance, and air permeability.

It is still another object of the present disclosure to provide a method of manufacturing the ventilation member for a vehicle lamp described above.

One aspect of the present disclosure relates to a vent member for a vehicle lamp. The ventilation member may include: a nanofiber membrane; a composite adhesive layer stacked on one surface of the nanofiber membrane; and a venting structure disposed on a central portion of the composite adhesive layer and in contact with the nanofiber membrane. The composite adhesive layer may include an acrylic adhesive layer in contact with the nanofiber membrane, and a silicon-based adhesive layer disposed on one surface of the acrylic adhesive layer. The acrylic adhesive layer may be in contact with the nanofiber membrane, the acrylic adhesive layer penetrating into the nanofiber membrane to a depth of 30 microns or more. The ventilation member for the vehicle lamp may have a water pressure resistance of 1.0 bar or more.

In one embodiment, the nanofiber membrane may be manufactured by hot-melting a nanofiber web formed by electrospinning a spinning solution comprising polyvinylidene fluoride.

In one embodiment, the nanofiber membrane may have a fiber diameter in the range of 50 nanometers to 500 nanometers and a porosity in the range of 10% to 80%.

In one embodiment, the acrylic adhesive layer may penetrate into the nanofiber membrane at a depth of 30 microns to 80 microns.

In one embodiment, the nanofiber membrane may have a thickness in the range of 30 microns to 150 microns. The thickness of the composite adhesive layer may range from 50 microns to 300 microns.

In one embodiment, the thickness of the nanofiber membrane and the thickness ratio between the total thickness of the silicon-based adhesive layer and the acrylic adhesive layer may be in the range of 1:0.3 to 1: 0.8.

In one embodiment, the thickness ratio between the silicon-based adhesion layer and the acrylic adhesion layer may be in the range of 1:0.5 to 1: 4.

In one embodiment, the composite adhesive layer may further comprise a carrier layer disposed between the acrylic adhesive layer and the silicon-based adhesive layer.

In one embodiment, the composite adhesive layer may be formed in a region occupying 55% -80% of the entire area of one surface of the nanofiber membrane.

In a particular embodiment, the nanofiber membrane may have an air permeability of 25 liters/hour or greater and a water vapor permeability of greater than 850 milligrams of water vapor/day at a pressure of 70 millibars.

Another aspect of the present disclosure relates to a method of manufacturing a ventilation member for a vehicle lamp. The method of manufacturing may include forming a composite adhesive layer by heat laminating a composite adhesive member to one surface of the nanofiber membrane. The composite adhesive member may include an acrylic adhesive layer in contact with the nanofiber membrane, and a silicon-based adhesive layer disposed on one surface of the acrylic adhesive layer. The acrylic adhesion layer may penetrate into the nanofiber membrane at a depth of 30 microns or more during the thermal lamination process.

In one embodiment, the heat staking may be performed at a temperature in the range of 120 ℃ to 140 ℃.

In one embodiment, the nanofiber membrane may be formed by forming a nanofiber web formed by electrospinning a spinning solution comprising polyvinylidene fluoride and hot melting the nanofiber web.

In one embodiment, the heat fusing may be performed at a temperature in the range of 60 ℃ to 150 ℃.

The ventilation member for a vehicle lamp according to the present disclosure may have excellent adhesion between a lamp material and a nanofiber membrane, have excellent durability and water pressure resistance, and have excellent water resistance, dust resistance, and air permeability.

Drawings

FIG. 1 illustrates a cross-sectional view of a vent member for a vehicle lamp according to an embodiment of the present disclosure;

FIG. 2 illustrates a plan view of a vent member for a vehicle lamp according to an embodiment of the present disclosure;

FIG. 3 illustrates a method of measuring water pressure resistance of a vent member for a vehicle lamp according to an embodiment of the present disclosure;

fig. 4 shows an SEM image of a nanofiber membrane according to example 1 of the present disclosure;

fig. 5 shows an SEM image of the penetration depth of the acrylic adhesive layer according to comparative example 1 in the nanofiber membrane;

fig. 6 shows an image of a ventilation member for a vehicle lamp according to example 1; and

fig. 7 shows an image of a ventilation member for a vehicle lamp attached to the vehicle lamp according to example 1.

Detailed Description

In the following description of the present disclosure, a detailed description of related well-known techniques and configurations will be omitted where it is determined that the subject matter of the present disclosure may thus become rather unclear.

Further, terms used herein are defined in consideration of their functions in the present disclosure, but may vary according to the intention or practice of a user or operator. Therefore, throughout the specification, terms should be defined based on the description.

The term "(meth) acrylic acid" as used herein may refer to at least one of "acrylic acid" and "methacrylic acid".

Ventilation member for vehicle lamp

One aspect of the present disclosure relates to a vent member for a vehicle lamp. Fig. 1 shows a cross-sectional view of a ventilation member for a vehicle lamp according to an embodiment of the present disclosure, and fig. 2 shows a plan view of the ventilation member for a vehicle lamp according to an embodiment of the present disclosure.

Referring to fig. 1 and 2, a ventilation member 100 for a vehicle lamp may include: a nanofiber membrane 10; a composite adhesive layer 20 stacked on one surface of the nanofiber membrane 10; and a ventilation structure 30 disposed on a central portion of the composite adhesive layer 20 and contacting the nanofiber membrane 10.

In a particular embodiment, the longitudinal cross-section of the nanofiber membrane 10 may have a circular, rectangular, or polygonal shape.

In a particular embodiment, the composite adhesive layer 20 includes an acrylic adhesive layer 22 in contact with the nanofiber membrane 10, and a silicon-based adhesive layer 26 disposed on one surface of the acrylic adhesive layer 22. The acrylic adhesive layer 22 penetrates into the nanofiber membrane 10 to a depth of 30 microns or more. In a particular embodiment, a silicon-based adhesive layer 26 may be attached to the surface on which the lamp is mounted.

In one embodiment, the acrylic adhesion layer may include an alkyl (meth) acrylate. For example, the alkyl (meth) acrylate may include one or more of methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, ethylhexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, nonyl (meth) acrylate, decyl (meth) acrylate, lauryl (meth) acrylate, and dodecyl (meth) acrylate. When the acrylic adhesive layer includes one or more of the above-mentioned compounds, the acrylic adhesive layer may be easily penetrated into the nanofiber membrane, and the ventilation member may have excellent durability.

For example, the acrylic adhesive layer may be formed using an adhesive composition including methyl (meth) acrylate.

In one embodiment, the silicon-based adhesive layer may include one or more of an epoxy silane compound, an aminosilane compound, a vinyl silane compound, a halosilane compound, a (meth) acryloxysilane compound, and an isocyanate silane compound. When the silicon-based adhesive layer contains one or more of the above-mentioned compounds, the silicon-based adhesive layer has excellent adhesion to the vehicular lamp member.

For example, a silicon-based adhesion layer may be formed using an adhesion composition including dichlorodimethylsilane.

Referring to fig. 1, a release layer 40 may be disposed on one surface of silicon-based adhesion layer 26 to prevent silicon-based adhesion layer 26 from being contaminated or to prevent adhesion of silicon-based adhesion layer 26 from being weakened.

In one embodiment, the composite adhesive layer area may comprise 55% to 80% of the total area of one surface of the nanofiber membrane. In this case, the adhesion between the nanofiber membrane and the composite adhesive layer is excellent, and the ventilation member according to the present disclosure may have excellent durability and water pressure resistance. For example, the area of the composite adhesive layer may be 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, or 80% of the total area of one surface of the nanofiber membrane.

In one embodiment, the nanofiber membrane may be fabricated by hot melting a nanofiber web formed by electrospinning a spinning solution comprising polyvinylidene fluoride (PVDF).

The spinning solution may include PVDF and a solvent. When the electrospun nanofiber web is hot-melted, the nanofiber membrane forms a three-dimensional (3D) multilayer structure. Accordingly, the nanofiber membrane may have excellent durability, air permeability, and water pressure resistance. In addition, when water permeates into the nanofiber membrane, each layer of the nanofiber web may block the permeation of water, and thus the nanofiber membrane may have excellent water pressure resistance properties.

In one embodiment, the nanofiber membrane 10 may have a fiber diameter in the range of 50 nanometers to 500 nanometers and a porosity in the range of 10% to 80%. In this case, the nanofiber membrane 10 may have excellent air permeability and durability, prevent a pressure difference between the inside and the outside of the vehicle lamp, and prevent water from leaking through the nanofiber membrane due to its excellent water pressure resistance.

In one embodiment, the acrylic adhesion layer penetrates into the nanofiber membrane to a depth of 30 microns or more.

The term "permeate" as used herein means that the components of the acrylic adhesive layer are fused by thermal lamination to permeate into the spaces between the pores of the nanofiber membrane.

When the acrylic adhesive layer penetrates into the nanofiber membrane at a depth of less than 30 microns, the adhesion between the nanofiber membrane and the acrylic adhesive layer is weakened. Accordingly, the ventilation member according to the present disclosure may not obtain a desired level of durability and water pressure resistance. For example, the acrylic adhesive layer may penetrate into the nanofiber membrane at a depth ranging from 30 microns to 80 microns. For example, the acrylic adhesive layer may penetrate into the nanofiber membrane at a depth of 30 microns, 31 microns, 32 microns, 33 microns, 34 microns, 35 microns, 36 microns, 37 microns, 38 microns, 39 microns, 40 microns, 41 microns, 42 microns, 43 microns, 44 microns, 45 microns, 46 microns, 47 microns, 48 microns, 49 microns, 50 microns, 51 microns, 52 microns, 53 microns, 54 microns, 55 microns, 56 microns, 57 microns, 58 microns, 59 microns, 60 microns, 61 microns, 62 microns, 63 microns, 64 microns, 65 microns, 66 microns, 67 microns, 68 microns, 69 microns, 70 microns, 71 microns, 72 microns, 73 microns, 74 microns, 75 microns, 76 microns, 77 microns, 78 microns, 79 microns, or 80 microns.

In one embodiment, the nanofiber membrane may have a thickness in the range of 30 microns to 150 microns. Within this thickness range, the nanofiber membrane may have excellent durability and water pressure resistance.

In one embodiment, the thickness of the composite adhesive layer may range from 50 microns to 300 microns. Within this thickness range, the composite adhesive layer may have excellent durability and water pressure resistance.

Referring to fig. 1, the composite adhesive layer 20 may further include a carrier layer 24 disposed between the acrylic adhesive layer 22 and the silicon-based adhesive layer 26. In one embodiment, the carrier layer 24 may comprise polyethylene terephthalate. When the carrier layer is provided, the durability and the water pressure resistance of the composite adhesive layer can be increased.

Referring to fig. 1, the thickness of the nanofiber layer and the thickness ratio between the total thicknesses of the silicon-based adhesive layer and the acrylic adhesive layer may be in the range of 1:0.3 to 1: 0.8. Here, the thickness of the acrylic adhesive layer does not include a portion of the acrylic adhesive layer penetrating into the nanofiber membrane. In this thickness ratio range, the adhesion to the lamp surface and the adhesion to the nanofiber film are excellent, and the deterioration of the properties such as water resistance and water pressure resistance to the vehicle lamp member due to temperature and humidity changes can be minimized. For example, the thickness ratio may be in the range of 1:0.5 to 1: 0.8. Here, the thickness of the acrylic adhesive layer does not include a portion of the acrylic adhesive layer penetrating into the nanofiber membrane.

In one embodiment, the thickness ratio between the silicon-based adhesion layer and the acrylic adhesion layer may be in the range of 1:0.5 to 1: 4. In this thickness ratio range, both the adhesion to the lamp surface and the adhesion to the nanofiber membrane are excellent, and thus the water resistance and the water pressure resistance of the ventilation member may be excellent.

Here, the thickness of the acrylic adhesive layer does not include a portion of the acrylic adhesive layer penetrating into the nanofiber membrane.

For example, the thickness ratio between the silicon-based adhesive layer and the acrylic adhesive layer may be in the range of 1:0.5 to 1: 3.

In one embodiment, the thickness of the carrier layer 24 may be in the range of 10 microns to 100 microns. Within this thickness range, the durability and hydraulic resistance of the composite adhesive layer can be increased.

In one embodiment, the nanofiber membrane may have an air permeability of 25 liters/hour or greater and a Moisture Vapor Transmission Rate (MVTR) of greater than 850 milligrams of water vapor/day at a pressure of 70 millibars. For example, the nanofiber membrane may have a gas permeability in the range of 25 to 50 liters/hour and a water vapor permeability of 860 to 2000 milligrams of water vapor/day at a pressure of 70 millibars.

In one embodiment, the hydraulic resistance of the nanofiber membrane and the composite adhesive layer is 1.0 bar or greater. When the hydraulic resistance is less than 1.0 bar, the hydraulic resistance expected in the present disclosure may not be obtained. For example, the hydraulic resistance may be in the range of 1.0 bar to 8.0 bar. For example, the hydraulic resistance may be 1 bar, 2 bar, 3 bar, 4 bar, 5 bar, 6 bar, 7 bar or 8 bar.

Fig. 3 illustrates a method of measuring water pressure resistance of a ventilation member for a vehicle lamp according to an embodiment of the present disclosure. Referring to fig. 3, the method of measuring the water pressure resistance may be performed by: a measuring module 200 having a volume of 10 cubic centimeters and provided with a hole having a diameter of 1.5 centimeters on the upper surface thereof was prepared, the measuring module 200 was injected with water, a nanofiber membrane was attached to the hole, and the pressure at which the nanofiber membrane was torn or the composite adhesive layer of the patch was broken and water was leaked was measured when the water pressure was increased by applying air pressure to the measuring module.

The measurement module used may be formed of a material including PC-ABS or PC. When the hydraulic resistance is less than 1.0 bar, the hydraulic resistance expected in the present disclosure may not be obtained. For example, the hydraulic resistance may be in the range of 1.0 bar to 8.0 bar. For example, the hydraulic resistance may be 1 bar, 2 bar, 3 bar, 4 bar, 5 bar, 6 bar, 7 bar or 8 bar.

Method for manufacturing ventilation member for vehicle lamp

Another aspect of the present disclosure relates to a method of manufacturing a ventilation member for a vehicle lamp. In one embodiment, a method of manufacturing a ventilation member for a vehicle lamp may include the step of forming a composite adhesive layer by heat laminating a composite adhesive member onto one surface of a nanofiber membrane.

The composite adhesive member includes an acrylic adhesive layer in contact with the nanofiber membrane, and a silicon-based adhesive layer formed on one surface of the acrylic adhesive layer. During thermal lamination, the acrylic adhesion layer penetrates into the nanofiber membrane to a depth of 30 microns or more. When the penetration depth is less than 30 μm, the water pressure resistance and durability of the ventilation member may be impaired.

In a particular embodiment, the thermal lamination may be performed at a temperature in the range of 120 ℃ to 140 ℃. When the thermal lamination is performed under this condition, at least a portion of the acrylic adhesive layer may penetrate into the nanofiber membrane, thereby improving the hydraulic pressure resistance and durability of the ventilation member. For example, the thermal lamination may be performed at a rate in the range of 1 meter/minute to 10 meters/minute at a temperature in the range of 120 ℃ to 140 ℃.

In a particular embodiment, the nanofiber membrane may be formed by the steps of forming a nanofiber web by a step of electrospinning a spinning solution comprising polyvinylidene fluoride (PVDF) and thermally melting the nanofiber web.

In a particular embodiment, the heat fusing may be performed at a temperature in the range of 60 ℃ to 150 ℃. Under this condition, a nanofiber membrane having a three-dimensional (3D) multilayer structure can be easily formed.

Hereinafter, the configuration and operation of the present disclosure will be described in more detail with reference to preferred examples of the present disclosure. It should be noted, however, that these examples are presented as preferred examples of the present disclosure and should not be considered as limiting the present disclosure in any way. What is not described herein can be fully and technically foreseen by the person skilled in the art and therefore the description thereof is omitted here.

Examples and comparative examples

Example 1

The nanofiber membrane (water pressure resistance of 5 bar, and 70 mbar pressure, air permeability of 25 l/hr or more, MVTR over 850 mg/day) has a circular longitudinal section, thickness of 100 μm, as shown in fig. 4, and is manufactured by forming a nanofiber web, which is formed by electrospinning a spinning solution comprising PVDF, and hot-melting the nanofiber web at a temperature in the range of 60 ℃ -150 ℃.

Thereafter, the manufacturing of the ventilation member for the vehicle lamp is performed by: preparing a composite adhesive member in which an acrylic adhesive layer (including methyl (meth) acrylate), a support layer formed of PET, and a silicon-based adhesive layer (including dichlorodimethylsilane) are sequentially stacked, forming the composite adhesive layer by thermally laminating the composite adhesive member to one surface of a nanofiber membrane at a rate of 1 m/min to 10 m/min in a temperature range of 120 ℃ to 140 ℃, and forming a venting structure located at a central portion of the composite adhesive layer and in contact with the nanofiber membrane. During thermal lamination, the acrylic adhesion layer penetrated into the nanofiber membrane at a depth of 30 microns. The composite adhesive layer was formed from an acrylic adhesive layer having a thickness of 30 microns (excluding the portion that penetrated into the nanofiber membrane), a support layer formed from PET having a thickness of 50 microns, and a silicon-based adhesive layer having a thickness of 40 microns.

Fig. 6 shows an image of a ventilation member for a vehicle lamp according to example 1, and fig. 7 shows an image of a ventilation member for a vehicle lamp attached to a vehicle lamp according to example 1.

The penetration depth of the acrylic adhesion layer was measured by Scanning Electron Microscope (SEM). In addition, the area of the formed composite adhesive layer occupied 68.7% of the total area of one surface of the nanofiber membrane.

Examples 2 and 3 and comparative example

The ventilation member was manufactured by the same method as example 1, except that the ventilation member was manufactured by heat laminating the penetrated thickness of the acrylic adhesive layer as shown in table 1.

Measurement of Water pressure resistance: a measurement module 200 having a capacity of 10 cubic centimeters and formed with a hole of 1.5 cm diameter on the upper surface thereof was injected with water, each of the vent patches according to examples and comparative examples was brought into contact with the hole, and the silicon-based adhesive layer of the vent patch was attached to the measurement module by pressing the peripheral portion of the vent patch using a jig and holding the vent patch in this position at room temperature for 30 minutes. Then, while increasing the water pressure by applying the air pressure into the measurement module, the air pressure (water pressure resistance) that leaks as the nanofiber membrane is torn or the composite adhesive layer of the patch is broken is measured. The results are shown in Table 1 below.

TABLE 1

Fig. 5 shows an SEM image of the penetration depth of the acrylic adhesive layer according to the comparative example in the nanofiber membrane. As can be understood by referring to the results of fig. 5 and table 1, in the comparative example, the penetration depth of the acrylic adhesive layer was smaller than that of the acrylic adhesive layer according to the present disclosure, and the hydraulic pressure resistance was greatly reduced to 0.7 bar.

On the contrary, it can be known that, in examples 1 to 3, the water pressure resistance of each ventilation member is 1 bar or more, and therefore the ventilation member has excellent water resistance and water pressure resistance, and can be suitably used for a ventilation member for a vehicle lamp.

The foregoing disclosure has been described in detail with reference to specific embodiments thereof. It will be understood by those skilled in the art to which the disclosure relates that the present disclosure may be embodied in modified forms without departing from essential characteristics thereof. Accordingly, the above-described embodiments disclosed herein are to be considered illustrative and not restrictive. It is intended that the scope of the disclosure be defined not by the above description but by the appended claims along with all differences which fall within the meaning and range of equivalency of the claims.