WO2020027356A1 - Wet nonwoven fabric for hydrocarbon trap of gasoline engine air cleaner and method for producing same - Google Patents

Abstract

The present invention relates to a wet nonwoven fabric for a hydrocarbon trap of a gasoline engine air cleaner and a method for producing same and, more specifically, to a wet nonwoven fabric for a hydrocarbon trap of a gasoline engine air cleaner and a method for producing same, in which powdered activated carbon having specific physical properties, pulp, a synthetic fiber of specific properties, and a carbon binder are prepared as basic raw materials, the materials are made into a web-type nonwoven fabric, the web-type nonwoven fabric is formed into a wet nonwoven fabric of a predetermined thickness through compression, and the wet nonwoven fabric is produced as a hydrocarbon trap, and when the hydrocarbon trap is installed in a gasoline engine air cleaner and used, the wet nonwoven fabric may adsorb oil mist such as hydrocarbons contained in evaporated gas generated from a combustion chamber of an engine or fuel of a fuel storage tank, and then desorb same when the engine is running, thereby preventing external leakage of hydrocarbons, which is the main cause of air pollution, and minimizing damage caused by hydrocarbon gas to a passenger in a vehicle.

Description

Wet nonwoven fabric for hydrocarbon trap of gasoline engine air cleaner and its manufacturing method

The present invention relates to a wet nonwoven fabric for a hydrocarbon trap of a gasoline engine air cleaner and a method for manufacturing the same, and more particularly, to select a powder activated carbon having a specific range of meso structure and a synthetic fiber having specific properties and to minimize the use of a carbon binder. By forming a wet nonwoven fabric, the hydrocarbon trap of the gasoline engine air cleaner is used to produce and use the hydrocarbon trap, thereby preventing the release of powdered activated carbon during the vapor adsorption and desorption process such as hydrocarbon gas. A wet nonwoven fabric for hydrocarbon traps.

In general, automobiles generate power by mixing and combusting fuel and air, respectively.

In other words, the fuel stored in the fuel tank of the vehicle passes through various fuel supply devices, is mixed with air from the outside, injected into the cylinder of the engine, and the engine operates while repeating the intake, compression, explosion, and exhaust stroke. And the car is powered accordingly.

As described above, a certain amount of air is required to operate the engine, and the air supply is introduced from the outside of the vehicle.

That is, the air outside the vehicle flows into the air cleaner and moves to the intake manifold through the air intake hose connected to the air cleaner to be supplied to the engine.

At this time, the air cleaner is installed inside the air cleaner to filter the dust and foreign matter contained in the outside air to filter the dust and foreign matter contained in the outside air to supply the air required for the combustion operation of the engine.

The air cleaner has an inlet formed to be coupled to an end of the air intake hose, and a diffuser is connected to the inside of the air cleaner.

On the other hand, hydrocarbon gas in the harmful gas discharged when the vehicle is running or stopped is emitted into the atmosphere and chemically reacts with ozone in the air to cause photochemical smog, and it is an air intake system (air duct, air cleaner, air). Inhalation hoses and throttle bodies) are required to have a device that can adsorb them as a serious harmful gas that leaks into the air, causes problems with copper, plants and humans and causes air pollution.

In other words, as the air intake system as described above, the air cleaner filter mounted on the air cleaner serves to filter foreign matter such as dust contained in the air supplied into the vehicle.

However, since there is no separate filter capable of collecting hydrocarbon gas in the conventional air cleaner, there is a problem in that the conventional air cleaner filter alone cannot collect the hydrocarbon gas contained in the boil-off gas generated in the engine.

In other words, the conventional air cleaner having only the conventional air cleaner filter as described above has a problem in that it is difficult to collect the hydrocarbon gas contained in the boil-off gas generated from the remaining fuel such as an engine, so that the hydrocarbon gas is discharged to the atmosphere. .

In addition, recently, in developed countries such as the United States, as the law on automobile exhaust gas is strengthened, the necessity of supplying a vehicle that satisfies the emission regulations is increasing.

In particular, when the engine is stopped, the restriction on hydrocarbon gas, which is fuel evaporation gas that is evaporated from residual fuel and stays in the engine or intake, is released to the atmosphere through the intake. The number of mandatory sales of installed vehicles is gradually increasing.

Therefore, in order to export vehicles to developed countries, it is necessary to equip the intake system with an efficient hydrocarbon gas collection device.

As a conventional technology for manufacturing a hydrocarbon trap for an air cleaner, Korean Patent Registration No. 10-749608 discloses a first filter layer mounted on an air cleaner cover coupled to an upper part of an air cleaner body equipped with an air cleaner filter, but having a form of a porous foam. The second filter layer is tightly bonded to the upper portion of the first filter layer but formed in a porous foam form in which activated carbon is adsorbed, so that the hydrocarbon gas is desorbed, the second filter layer is tightly bonded to the upper portion of the second filter layer, but is formed in the porous foam form. And a filter assembly having a wire mesh positioned to receive the third and fourth filter layers and the first to fourth filter layers therein, the wire mesh being tightly coupled to the first to fourth filter layers. The outer filter of the fourth filter layer and the wire mesh is fixed to be in close contact with each other by thermal or ultrasonic pressing. It is proposed for hydrocarbon traps.

However, in the case of such a hydrocarbon trap, the vapor adsorption and desorption effect can be expected to some extent, but the manufacturing process is too complicated, the structure is complicated, and the performance was not very good.

In addition, Korean Patent Publication No. 10-2017-0025376 is composed of powdered activated carbon, pulp, and the basic raw materials and additives of dispersing agent, water repellent, humectant, sizing agent, carbon fixing agent, wet nonwoven fabric having a certain thickness through compression process. There is proposed a technique for producing a.

This technique can be evaluated as a significantly improved technology compared to the conventional nonwoven fabric for hydrocarbon traps, but the use of carbon fixing agent, such as the release of activated carbon still occurs, there is a problem of poor quality, limited adsorption capacity and synthesis of activated carbon Since the compatibility with the fiber was not considered, solving the limitations of the adsorption and desorption performance of the vapor and the defect caused by the release of activated carbon became a new challenge.

Similarly, in Japanese Patent Application Laid-Open No. 2000-024426, which is a technique used for the purpose of purifying air, unlike an air cleaner, the adsorbent sheet having granular activated carbon-containing sheet, wherein the granular activated carbon-containing sheet has an average particle diameter of 100 to Provided are an adsorptive sheet comprising 600 µm granular activated carbon, support fibers for contacting and fixing the granular activated carbon, and adhesive fibers mainly contributing to shape retention.

However, this technique proposes an air purifying filter that has good air permeability and excellent dust removal performance for a long time, and is a simple filter structure for the purpose of air purification and dust elimination, and thus it is a hydrocarbon for an air cleaner that requires repeated adsorption and desorption of vapor. Because it is a completely different function from traps, it is not applicable to hydrocarbon trap products.

As described above, in the case of a filter trap for a hydrocarbon trap of an air cleaner that is mounted in a conventional air cleaner, continuous research and development for improving performance or improving a defective rate is required.

{Prior art document}

{Patent Literature}

(Patent Document 001) Korea Patent Registration No. 10-749608

(Patent Document 002) Korean Patent Publication No. 10-2017-0025376

(Patent Document 003) Japanese Patent Laid-Open No. 2000-024426

In order to solve the above problems, the present invention newly configured the characteristics of the wet nonwoven fabric for the hydrocarbon trap of the gasoline engine air cleaner by improving the physical properties and excellent durability, while evaporated gas generated from the fuel of the engine combustion chamber or fuel storage tank An object of the present invention is to remarkably improve the adsorption and desorption performance of oil vapors, such as hydrocarbons contained therein.

Therefore, an object of the present invention is to selectively use activated carbon of a specific physical property and synthetic fibers of a specific physical property and to form a wet nonwoven fabric by mixing a minimum amount of a carbon binder, thereby preventing the release of activated carbon and providing the vapor of the vapor installed in the air cleaner of the gasoline engine. To provide a wet nonwoven fabric for hydrocarbon traps with improved adsorption and desorption performance.

In addition, another object of the present invention is to significantly improve the gas adsorption and desorption capacity of gasoline, to capture the hydrocarbons in the boil-off gas discharged when the vehicle is running or stopped to prevent the outflow of hydrocarbons, the main culprit of air pollution, The present invention provides a wet nonwoven fabric for a hydrocarbon trap of a gasoline engine air cleaner with a new configuration that allows passengers in the vehicle to minimize damage caused by hydrocarbon gas.

In addition, another object of the present invention is for a hydrocarbon trap of a gasoline engine air cleaner of a new configuration for producing a wet nonwoven fabric by mixing activated carbon of a specific physical property, synthetic fibers of a specific physical property, and pulp and carbon binder in a specific ratio and pressing them under heat. It is to provide a method for producing a wet nonwoven fabric.

In order to solve the above problems, the present invention is installed in a gasoline engine air cleaner, the engine captures the hydrocarbons in the boil-off gas generated from the fuel of the combustion chamber or fuel storage tank of the engine when the vehicle is stopped or running the engine In the wet nonwoven fabric for hydrocarbon traps to be recovered to the side to be reburned,

It contains a basic raw material including powdered activated carbon, pulp, synthetic fibers and carbon binder, the powdered activated carbon has an average particle size of 20㎛ ~ 150㎛, meso structure has a range of 45 ~ 90%, the synthetic fiber has a diameter It provides a wet nonwoven fabric for a hydrocarbon trap of a gasoline engine air cleaner, characterized in that it comprises less than 30㎛ and melting point 110 ℃ ~ 270 ℃.

According to a preferred embodiment of the present invention, the synthetic fibers, for example, ultra-fine fibers, ultra-fine fibers, divided yarn or island-in-the-sea yarn; Alternatively, one or more synthetic fibers selected from Sheath / Core or Side by Side type composite melting point fibers selected from PP / PE, PET / PE, PET / PP, or PET / NYLON may be used.

According to a preferred embodiment of the present invention, the basic raw material may be composed of 45 to 80% by weight of the powdered activated carbon, 3 to 13% by weight of pulp, 10 to 30% by weight of synthetic fiber, 3 to 12% by weight of carbon binder. .

According to a preferred embodiment of the present invention, the base material may additionally include one or more additives selected from dispersants, water repellents, carbon fixing agents, dehydration accelerators.

In addition, according to a preferred embodiment of the present invention, the additive is added to the dispersing agent in the content of 0.05 to 2.0% by weight, the water repellent in the content of 0.2 to 1.0% by weight, the carbon fixing agent is 0.05 ~ In an amount of 1.0% by weight, the dehydration accelerator may include any one or more in an amount of 0.05 to 1.0% by weight.

According to a preferred embodiment of the present invention, the wet nonwoven fabric has a weight of 300 to 800 g / m 2 and a thickness of 2.2 to 3.6 mm before the heat compression process (S150), and 300 to 800 g / through the heat compression process (S150). It is preferable to carry out compression molding at a weight of 2 m 2 and a thickness of 0.6 to 1.8 mm.

In addition, the method for producing a wet nonwoven fabric for a hydrocarbon trap of a gasoline engine air cleaner according to the present invention is built in a gasoline engine air cleaner, the evaporation gas generated from the fuel of the engine combustion chamber or fuel storage tank when the vehicle is stopped or running. In the manufacturing method of the wet nonwoven fabric for hydrocarbon traps of a gasoline engine air cleaner which collect | recovers a hydrocarbon or makes it collect | recovers and collects the collected hydrocarbon to an engine side,

Prepare a basic raw material including powdered activated carbon, pulp, synthetic fibers and carbon binder, wherein the powdered activated carbon uses activated carbon having an average particle size in the range of 20 µm to 150 µm and a meso structure in the range of 45 to 90%. Preparing a basic raw material using synthetic fibers having a diameter of 30 μm or less and a melting point of 110 ° C. to 270 ° C. as synthetic fibers;

Undergoing a suspension process (S110) of making the basic material into a suspension;

Forming a base material that has undergone the suspension process (S110) into a web type through a web formation process (S120);

Going through the water discharge step (S130) in the state of the web type;

Drying through the drying process (S140) after the water is discharged; And

After the drying step (S140) and the heat compression molding step through the heat compression step (S150) to form a sheet type or roll type of fabric

It provides a method for producing a wet nonwoven fabric for a hydrocarbon trap of a gasoline engine air cleaner comprising a.

In addition, the present invention includes a hydrocarbon trap of a gasoline engine air cleaner manufactured using the wet nonwoven fabric prepared as described above.

The non-woven fabric for the hydrocarbon trap of the gasoline engine air cleaner according to the present invention and the effects on the hydrocarbon trap using the same will be described.

First, when the wet nonwoven fabric according to the present invention is used to be mounted on the wall or deviewer of the air cleaner housing of the gasoline engine, the durability of the product is excellent and the adsorption and desorption performance of the vapor is remarkably improved.

Second, the wet nonwoven fabric according to the present invention manufactures a wet nonwoven fabric using powdered activated carbon, pulp, synthetic fibers of a specific physical property, and a carbon binder as a basic raw material, thereby preventing separation of the powdered activated carbon and minimizing carbon binder. Since the binder does not block the meso structure of the activated carbon, there is an effect that can significantly improve the performance of Butane Working Capacity (BWC). This effect is achieved by the synergistic effect of selectively using the powdered activated carbon as a specific physical property in the present invention, and selectively using a synthetic fiber of a specific physical property, which is previously unpredictable.

Third, the wet nonwoven fabric according to the present invention significantly improves the gas adsorption and desorption capacity of gasoline, and captures hydrocarbons in the boil-off gas discharged when the vehicle is running or stopped, thereby preventing the outflow of hydrocarbons, which is the main cause of air pollution. In addition, there is an effect that the passengers in the vehicle can minimize the damage caused by the hydrocarbon gas.

Fourth, the wet nonwoven fabric according to the present invention can be further improved when the dispersant, water repellent, carbon fixing agent, dehydration accelerator is used as an additive, the production of a wet nonwoven fabric and a hydrocarbon trap using the same superior quality compared to the conventional It has a useful effect.

Fifth, the wet nonwoven fabric according to the present invention is produced by compressing it to a volume of about 1/2 after being manufactured in a basic structure, thereby minimizing the volume and mounted on the housing wall or deviewer to lower the pressure loss than the conventional bent type. As it saves fuel economy and is very advantageous when applied to hydrocarbon traps, and is formed of wet non-woven fabric of constant thickness, it is applied to hydrocarbon traps and used in the engine air cleaner housing when installed in the engine air cleaner housing. There is an effect that is maximized.

1 is a block diagram showing a manufacturing process of a wet nonwoven fabric for a hydrocarbon trap of a gasoline engine air cleaner according to the present invention.

Figure 2a is a photograph showing the distribution state by pore size of the activated carbon structure according to the present invention,

Figure 2b is a partially enlarged photograph of the pore structure of the activated carbon according to the present invention,

Figure 2c is a graph showing the pore volume change rate according to the distribution of meso structure and micro structure pores of activated carbon according to the present invention.

3 is a diagram illustrating a cross-sectional structure of a preferred fiber to be applied as a synthetic fiber according to the present invention, conceptually illustrating various shapes of a composite melting point fiber of Sheath / Core or Side by Side type.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to a method of manufacturing a wet nonwoven fabric for hydrocarbon traps and a hydrocarbon nonwoven fabric for hydrocarbon traps produced by the gasoline engine air cleaner according to the present invention in detail as an embodiment.

1 is a block diagram showing a manufacturing process of a wet nonwoven fabric for a hydrocarbon trap of a gasoline engine air cleaner according to the present invention.

Referring to FIG. 1, there is illustrated a method of manufacturing a non-woven fabric for a hydrocarbon trap of a gasoline engine air cleaner according to a preferred embodiment of the present invention, which is built in an air cleaner to store fuel of an engine when the vehicle is stopped or running. Step by step is a method for producing a wet nonwoven fabric that captures hydrocarbons in the boil-off gas generated from the fuel of the tank or recovers the collected hydrocarbons to the engine.

Figure 2a is a photograph showing the meso structure distribution state of the activated carbon structure according to the present invention, Figure 2b is a partially enlarged picture of the pore structure of the activated carbon according to the present invention, Figure 2c is a meso structure of the activated carbon according to the present invention It is a graph showing the pore volume change rate according to the distribution of pore size.

Referring to Figure 2a to 2c, the more the distribution of the meso (Meso) structure as an activated carbon component according to a preferred embodiment of the present invention is advantageous because it can be used repeatedly in the adsorption-desorption-desorption-desorption iteration process.

3 is a view conceptually illustrating various shapes of a composite melting point fiber of Sheath / core or Side by Side type suitable for application to a synthetic fiber according to the present invention.

Referring to FIG. 3, when synthetic fibers and composite melting point fibers having a diameter of 30 μm or less are used as the synthetic fibers according to the present invention, the activated carbon between the fibers is isolated and attached to the powdered activated carbon and the activated carbon is separated from the activated carbon. It was confirmed that activated carbon is combined with synthetic fibers to lower the carbon binder content.

In addition, the wet nonwoven fabric for the hydrocarbon trap of the gasoline engine air cleaner manufactured by the method for producing a hydrocarbon trap for the hydrocarbon trap of the gasoline engine air cleaner according to the present invention is built in the air cleaner, but by ultrasonic welding on the housing of the air cleaner It can be fixed.

Here, the wet nonwoven fabric for the hydrocarbon trap of the gasoline engine air cleaner according to the present invention may include a basic raw material composed of powdered activated carbon, pulp, synthetic fibers and a carbon binder. In addition, it may further include one or more additives selected from dispersants, water repellents, carbon fixatives, dehydration accelerators.

On the other hand, in order to manufacture a wet nonwoven fabric through a suspension process (S110) of mixing the basic raw materials and additives as necessary to make a suspension, and then formed in a web type through a web formation process (S120), the state of the web type After passing through the water discharge step (S130) to dry through the drying step (S140), and after the drying step (S140) through a heat compression process (S150) to heat compression molding to form a sheet type or roll type fabric This can be done.

According to a preferred embodiment of the present invention, in the most preferred composition, the basic raw material contains 45 to 80% by weight of powdered activated carbon, 3 to 13% by weight of pulp, 10 to 30% by weight of synthetic fibers, and 3 to 12% by weight of carbon binder. Used as a%.

In addition, the additive additionally added to the base material is preferably 0.05 to 0.2% by weight of dispersant, 0.2 to 1.0% by weight of water repellent, 0.05 to 1.0% by weight of carbon fixing agent, 0.05 to 1.0 weight of dehydrating agent with respect to the total wet nonwoven fabric composition. It may consist of a composition of%.

According to a preferred embodiment of the present invention, the powdered activated carbon is preferably used having an average particle size of 20㎛ ~ 150㎛ range. If the particle size is too small, the adsorption efficiency is low and dust is severe in the manufacturing process, which is not preferable. In addition, if the particle size is too large, the overall adsorption effect may be lowered, and activated carbon powder may be released when used in a manufacturing process or as a trap.

In addition, when the activated carbon particle size is smaller than 20 μm, the activated carbon in the wire suction process for removing water from the wet nonwoven suspension is largely drawn out with the water. When there are too many activated carbons having a size of 20 μm, the suction pressure becomes too high. As a result, a wet nonwoven fabric may not be manufactured.

When activated carbon having an average particle size larger than 150 μm is used for the HC TRAP, when activated carbon particles are mixed in the engine when vibration occurs after being installed in the engine air cleaner, it may adversely affect the engine.

In other words, a small amount of activated carbon requires a low butane adsorption capacity, an increased filtration area, and a small space in the engine air cleaner housing, thus requiring a large amount of activated carbon. It is poor in adhesion and difficult to work with a flat or circular engine air cleaner housing structure.

In the present invention, the pulp is used, and the pulp facilitates the transport in the media moisture state due to the strong hydrogen bond, and serves to attach a lot of fine powdered activated carbon to the flat pulp structure. Therefore, if the amount of the pulp used is too small, the activated carbon adhesion efficiency is low. If the excess pulp is too excessive, the activated carbon adheres well, but a lot of vacuum pressure is generated in the water discharge process and the water cannot be discharged, thereby inhibiting the overall adsorption and desorption effect. There is concern.

According to a preferred embodiment of the present invention, pulp may be generally NBK (CANFOR Pulp and Paper Company), but is not necessarily limited thereto.

In addition, according to a preferred embodiment of the present invention, the powder activated carbon as described above is used in the particle size range 20㎛ ~ 150㎛, preferably, the specific surface area is preferably 1,000 ~ 3,000 m 2 / g per 1g. Even more preferred is preferably 2.000 to 3,000 m 2 / g per gram. If the specific surface area is too small, there is a problem that it is difficult to manufacture a wet nonwoven fabric because an excessive amount of activated carbon should be used and it should be included up to two times more. In addition, if the specific surface area is greater than 3,000 m2 / g per 1g, the apparent density increases and the volume of activated carbon increases to make the wet nonwoven fabric so that the mixing ratio of the ultrafine fibers or the content of the synthetic fibers must be excessively increased to 30% or more. It is not preferable because the temperature and pressure must be further increased in the heat compression process of the nonwoven fabric.

Microfiber is a thread having a thickness of less than 1 denier (5㎛). In general, microfiber is a very soft and soft touch. It is a fine fiber of up to 0.001 denier depending on the spun fiber. It can be made of fibers and is usually used as artificial suede that requires softness, or as a cloth for cleaning lenses such as glasses.

In the present invention, the term 'melting point microfibers' refers to fibers made of microfiber yarns, microfiber yarns, decomposed yarns and island-in-the-sea yarns having a melting point of 110-270 ° C and a diameter of 30 μm or less. If it is a synthetic fiber satisfying such melting point and thickness, it can be used without particular limitation.

Although the powdered activated carbon used in the present invention should have a specific surface area as described above, in the present invention, the pore structure of the powdered activated carbon is preferably specified. In the present invention, the meso structure in the pore structure of the activated carbon is 45 to 90%. Range, more preferably 60-90%. If the meso structure of the powdered activated carbon is less than this range, the adsorption amount of the vapor is drastically lowered. If the amount of the activated carbon is too low, the production of activated carbon is difficult to manufacture the activated carbon, which is uneconomical but does not increase the adsorption amount any more. There is a risk of remaining without desorption.

Here, the meso structure means that the pore size of activated carbon is in the range of 2 nm to 50 nm, and the adsorption-desorption-adsorption-desorption repetition of oil vapor is remarkable due to the use of powdered activated carbon having such a meso structure in a specific range. It can be improved.

In this regard, the distribution of meso structure in the pore structure of activated carbon is illustrated in FIG. 2A, where the micro structure or meso structure is considered in consideration of the fact that the activated carbon repeats adsorption-desorption-adsorption-desorption. The distribution of mesostructures is more important in the present invention.

In particular, as shown in Figure 2c, it can be seen that the distribution of meso structure in the activated carbon has a significant meaning, this graph is a specific surface area measurement (BET) method of the micro (Meso) pore structure for the activated carbon The experimental results are shown. In the graph of FIG. 2C, the dotted line means the micro pore structure, and the solid line means the meso pore structure. Therefore, it was confirmed that activated carbon in which the meso structure of the solid line shown vertically is distributed at 45-90% belonging to the range corresponding to the hydrocarbon trap (HC TRAP) has an excellent adsorption and desorption effect.

According to the present invention, the content of this meso structure of the powdered activated carbon is not absolutely proportional to the specific surface area. Even if the specific surface area is small, the content of the meso structure may be high depending on the formation rate of the macro structure of the pores larger than the meso structure or the micro structure smaller than the meso structure. May be included. The meso structure content and macro or micro structure content of the powdered activated carbon may be changed in various ways depending on the raw material of the activated carbon and the manufacturing process and manufacturing conditions of the activated carbon.

Therefore, in the present invention, powdered activated carbon containing 45-90% of the total amount of such meso structure in the powdered activated carbon used as the basic raw material should be used, and the overall composition of the basic raw materials such as pulp and carbon binder and the use of specific synthetic fibers, which are other mixed components, As a result, a synergistic effect on the adsorption and desorption effect of oil vapor can be expected.

In addition, the higher the activated carbon specific surface area and meso structure, the better the adsorption and desorption performance of butane, and when the specific surface area is narrow and the meso structure is developed, the activated carbon requires more weight than 90%, thus producing activated carbon containing more than 90% of the meso structure. The method is ineffective because it is uneconomical for the purpose of the present invention.

Therefore, the present invention uses a powder activated carbon in the range of 20㎛ ~ 150㎛ average particle size as described above, the specific surface area is provided in the specific surface area range of 1,000 ~ 3,000㎡ / g per 1g and at the same time 45 ~ 90% of the structure of activated carbon By constructing a wet nonwoven fabric comprising a meso structure in the range, when used in a hydrocarbon trap, the hydrocarbons contained in the boil-off gas generated from the fuel in the combustion chamber or fuel storage tank of the engine when the engine is stopped when the vehicle is stopped Regardless of the size, it can be more efficiently collected and easily detached with respect to the overall size.

As such, the boil-off gas generated in the engine stop state is generated from fuel remaining around the fuel injector after the engine stops, or fuel such as the combustion chamber and fuel storage tank of the engine, and the gas includes hydrocarbon gas. It is necessary to collect such hydrocarbon gas. According to the present invention, when the wet nonwoven fabric for hydrocarbon traps manufactured using a powder activated carbon containing 45-90% of the meso structure having a particle size in the range of 20 μm to 150 μm is used, Regardless of the size of, the overall size can be collected more efficiently.

According to the present invention, the distribution of the average particle size and meso structure of the powdered activated carbon is a very important factor for the vapor absorption performance of the whole wet nonwoven fabric and the quality of the hydrocarbon trap. In particular, there is an important meaning because it is also a condition for expecting the synergistic effect on the overall quality and the adsorption and desorption effect of the vapor together with the selective properties of the synthetic fibers described later.

According to a preferred embodiment of the present invention, as the synthetic fibers, synthetic fibers having a diameter of 30 μm or less, more preferably 10 μm or less and a melting point of 110 ° C. to 270 ° C. are preferably used. If the diameter is too large or the melting point is not limited to the above range, when the wet nonwoven fabric is manufactured and applied to a hydrocarbon trap, activated carbon particles are released or heat-compressed so that the compression of the activated carbon particles is not performed and the activated carbon particles are released. It is difficult to expect subsumption effects such as prevention, so the desired quality cannot be expected.

According to a preferred embodiment of the present invention, such synthetic fibers include at least one selected from, for example, ultrafine fibers, ultrafine fibers, split yarns, islands-in-the-sea yarns or melting points of 110 ° C. to 270 ° C. and between sheath / core or side-by-side ( Side by Side) composite melting point fibers of one or more of PP / PE, PET / PE, PET / PP, PET / NYLON can be used.

PP is polypropylene, PE is polyethylene, PET is polyethylene terephthalate, respectively.

In this regard, FIG. 3 shows various types of composite melting point fibers of Sheath / Core or Side by Side type. Here, a case in which the fiber diameter is 10 μm is illustrated, and the cross-sectional structure of the composite melting point fiber is conceptually displayed. The synthetic fibers usable in the present invention are not limited thereto, and composite melting point fibers composed of other similar forms or other similar components may be used.

In addition, according to the present invention, the synthetic fiber can be used as long as the diameter and melting point, which are the above conditions, fall within the above ranges.

The reason for using such synthetic fibers in the present invention is to prevent the separation of powdered activated carbon used together and to minimize the use of a carbon binder, so that the carbon binder does not block the Meso structure of the activated carbon to improve the performance of the BWC. In addition, in order for the powdered activated carbon used in the present invention to stably exist in the nonwoven fabric in an attached or enclosed state, the selective feature of the synthetic fiber according to the present invention has an important meaning, and thus the adsorption and desorption effect is remarkably increased. It can be increased, and because it exhibits a stable activated carbon inclusion effect, a synergistic effect with powdered activated carbon can be expected.

Thus, in the present invention, by using the specific synthetic fibers as described above, it is possible to achieve the surprising effect of preventing the release of activated carbon, controlling the thickness of the heat compression process, and smoothing the ultrasonic welding of the engine air cleaner.

According to a preferred embodiment of the present invention, the specific synthetic fibers can be used in a composition of 10 to 30% by weight, if the amount is too small, there is a problem that can not be enough to apply activated carbon, if too large The activated carbon content per unit volume is so small that it is difficult to expect an improvement in the adsorption and desorption effect.

According to a preferred embodiment of the present invention, in the case of using the melting point microfibers in the synthetic fibers, a water repellent having good dispersibility in the melting point microfibers is used to improve the dispersibility of the melting point microfibers and to prevent water inflow of the powdered activated carbon. It is preferable to use a water repellent, in which the water repellent used does not block the pore structure of activated carbon, it is preferable to use a water repellent that minimizes the inhibition of water absorption.

In addition, in the present invention, a carbon binder is used, which is used to prevent the powdered activated carbon from adhering to the synthetic fiber to be fixed and detached. For example, the carbon binder may be acrylic resin, polyvinylacetate, or the like. ), Polyvinyl alcohol (PVA, Polyvinyl alchol) resin or powder, starch (CMC), phenol resin (Phenol resin), vinyl acetate (EVA) resin or powder, polyethylene (PE) powder may be used.

In the present invention, when the carbon binder is used too little, the release of activated carbon particles may occur, and when used too much, the pores of the activated carbon may be blocked and the adsorption efficiency may be greatly reduced.

The present invention is preferably to minimize the content of such a carbon binder, the reason is that it is prepared in a composition that can minimize the amount of the carbon binder by using the powdered activated carbon and synthetic fibers selected as having a specific physical property as described above Is now possible.

According to a preferred embodiment of the present invention, in addition to the basic raw material as an additive can be used as a dispersant 0.05 ~ 0.2% by weight relative to the total wet nonwoven composition, for example, modified starch (modified starch) can be used as a dispersant, Dispersants may be used. Moreover, as a water repellent used as an additive, normal water repellents, such as a silane type, a siloxane type, and a silicon type | system | group, can be used in 0.2 to 1.0 weight%.

In addition, according to a preferred embodiment of the present invention, a carbon fixing agent and a dehydration accelerator may be used as an additional component in order to suppress the activated carbon loss rate and enhance the adsorption and desorption effect, and as the carbon fixing agent, an amine polymer such as 1,2-ethanediamine, etc. Can be preferably used. Such carbon fixatives may be used at 0.05-1.0% by weight relative to the total wet nonwoven composition. If the amount is too small, there is no addition effect, and even if excessively used, the adsorption and desorption effect may be inhibited.

In addition, as a dehydration accelerator that can be used as an additive, an amide system such as polyacrylamide may be used, and the content thereof may be used at 0.05-1.0 wt%. In this case, too little amount can be expected to promote dehydration, and too much amount may inhibit the adsorption and desorption effect.

 According to a preferred embodiment of the present invention, the method for producing a wet nonwoven fabric for a hydrocarbon trap of a gasoline engine air cleaner according to the present invention as described above through the heat compression process (S150) through a rolling roller of the sheet type or roll type Molded into a fabric, but the weight of 300 ~ 800g / ㎡, 2.2 ~ 3.6mm thickness immediately before the heat compression process (S150), the weight of 300 ~ 800g / ㎡ through the heat compression process (S150), 0.6 ~ It is desirable to be press molded to a thickness of 1.8 mm. This means that there is no change in weight and the compression is such that there is a volume reduction of about 1/2 through heat compression. If there is too much pressing, there is a problem that the adsorption and desorption effect can be reduced.

On the other hand, the method for producing a wet nonwoven fabric for a hydrocarbon trap of a gasoline engine air cleaner according to the present invention is a dry nonwoven fabric made of synthetic fibers in close contact with the sheet-type or roll-type synthesis through the heat compression process (S150) It may be to be molded into a nonwoven fabric.

According to a preferred embodiment of the present invention, the dry nonwoven fabric is in close contact with any one surface of the wet nonwoven fabric for the hydrocarbon trap of the gasoline engine air cleaner as described above, the sheet type or roll type through the heat compression process (S150) It may be molded into a synthetic non-woven fabric, in this case it can be configured to be built in the air cleaner, it is possible to be more stably fusion fixed by ultrasonic welding on the housing of the air cleaner.

According to a preferred embodiment of the present invention, considering the activated carbon loss rate and butane capacity efficiency (BWC) of the wet nonwoven fabric for hydrocarbon traps completed from the suspension process (S110) to the drying process (S140), the meso structure as described above is a specific range Preference is given to using powdered activated carbon of certain physical properties.

In addition, in the case of the gasoline engine air cleaner, since the engine may be damaged when 200 μm particles are introduced into the engine, the powder activated carbon uses powder activated carbon in the range of 20 to 150 μm, and the mesh in the suspension process (S110). In the process of suctioning water through the net, it is preferable to additionally use a carbon fixing agent in order to reduce the powdered activated carbon loss rate with the powdered activated carbon to escape with the water. As such, the additives additionally used in the present invention may contribute to partially further improving the physical properties of the wet nonwoven fabric.

In addition, according to a preferred embodiment of the present invention, the heat compression process (S150) is a raw material mixed with the additives listed above when activated carbon, pulp, synthetic fibers, carbon binders or additional components are used after the fabric is dried Since these components are not completely combined, it is necessary to prevent the raw materials used to manufacture the wet nonwoven fabric from being desorbed in the process of being installed and used in the gasoline engine air cleaner. For this purpose, it is preferable to perform a heat compression process. However, if the thickness of the fabric is thick after heat compression, it is preferable to minimize the thickness by performing a heat compression process because the pressure loss of the flow path is increased to increase fuel consumption.

As an example according to the present invention, in the fabric of the raw material through the suspension and the web forming process using the basic raw material of the present invention, if it is by the Hanji method is less related to the dehydration time, in the mechanical continuous line Because of the limitation of suction, you can manufacture with fabric by increasing suction capacity. In addition, as another preferred example, there are cases where it is practically preferable to manufacture and combine the two plies in reality.

In addition, it is preferable that both the paper and the mechanical method are pressed using a multi-stage press.

In this case, according to a preferred embodiment of the present invention in the heat compression process usually at least 1/2 of the initial thickness should be reduced and the basic is limited to reduce the thickness even with the suction process is a synthetic fiber in a specific condition according to the present invention Use may yield desirable results. For example, melting point microfibers or the like and synthetic fibers selectively used in the present invention exemplified above may be preferably used. In order to prevent the release of activated carbon during the fabrication process, the hot pressing process is performed at a temperature of 150 ° C. to 260 ° C. and 30N / It is preferable to crimp under high pressure conditions of cm <2> -300N / cm <2>.

As such, the wet nonwoven fabric for hydrocarbon traps of a gasoline engine air cleaner manufactured by the manufacturing method as described above captures hydrocarbons in the boil-off gas generated from fuel of the combustion chamber or fuel storage tank of the engine when the vehicle stops or runs. By recovering the collected hydrocarbon to the engine side to be re-burned, it can be applied to a hydrocarbon trap attached to the engine air cleaner such as a car for oil adsorption and desorption in a conventional manner.

The present invention therefore comprises a hydrocarbon trap for a gasoline engine air cleaner comprising a wet nonwoven fabric for a hydrocarbon trap according to the present invention as described above.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited by Examples.

Here, the activated carbon performance test of activated carbon of powder activated carbon (Experimental Example 1), the suspension process (S110) to the drying process (S140) for the air cleaner applying the wet nonwoven fabric prepared in Examples and Comparative Examples, the wet nonwoven fabric for hydrocarbon trap Butane working capacity efficiency (BWC) of the wet nonwoven fabric for hydrocarbon traps in which the manufacturing process was completed from the test (Experimental Example 2) and the suspension process (S110) to the heat compression process (S150). The BWC performance test (Experimental Example 3), ultrasonic fusion (Experimental Example 4), etc., which have been examined will be described step by step.

Preparation Example 1-6, Preparation Example 1-4

To prepare a powder activated carbon used to produce a wet nonwoven fabric for a hydrocarbon trap of a gasoline engine air cleaner in the configuration as shown in Table 1.

Experimental Example 1: Activated carbon performance test of powdered activated carbon

In order to perform adsorption and desorption performance test on the powdered activated carbon prepared in Preparation Examples and Comparative Examples, baking at 110 ° C. for 3 hours before testing, using a standard jig for testing, and 500 ml of activated carbon at room temperature (25 ° C. ± 2 ° C.) ℃, 1atm), 50 ± 5% RH, 250cc / min of N ₂ gas and 250cc / min of Butane Gas, measured until saturation after loading and purging to 25.5L / min to the minimum mass Purging, and the results are shown in Table 1 below.

division	Meso Structure (%)	Specific surface area (㎡ / g)	BWC mass / Carbon mass	BWC adsorption / desorption efficiency (%)
Preparation Example 1	88.1	2,500	0.23	95.81
Preparation Example 2	80.0	2,393	0.22	93.79
Preparation Example 3	75.3	2,100	0.19	89.00
Preparation Example 4	54.0	1,800	0.18	84.80
Preparation Example 5	45.3	1,500	0.17	83.10
Preparation Example 6	80.0	1,800	0.19	85.12
Comparative Example 1	92.1	2,500	0.23	93.90
Comparative Example 2	30.2	1,500	0.09	45.21
Comparative Example 3	25.5	1,100	0.05	36.60
Comparative Example 4	50.5	800	0.11	57.36

Referring to the activated carbon performance test (Experimental Example 1) of the powdered activated carbon as described above, the higher the specific carbon surface area and the meso structure content, the higher the adsorption performance of butane gas, and the lower the content of the meso structure, butane. It was found that the adsorption performance of the gas was reduced. In addition, when considering the adsorption and desorption performance in the wet nonwoven fabric composition, it was found that the larger the specific surface area of the powdered activated carbon, the larger the meso structure than the specific surface area dominates the adsorption and desorption performance.

That is, the higher the butane gas collection weight (g) per 1g of activated carbon, the better the collection performance.

For reference, it is ideal that the sum of the adsorption efficiency and the desorption efficiency is close to 99% since it is mounted on the gasoline engine air cleaner and is adsorbed when the vehicle is stopped, and desorbed during operation and used semi-permanently until the end of the vehicle.

If the adsorption and desorption performance is low, butane (Butane) gas is trapped inside the activated carbon, so it is not completely desorbed. But for semi-permanent use, butane gas is completely desorbed and adsorbed again. Trap) has its limits.

Moreover, the higher the meso structure and the specific surface area, the higher the butane adsorption capacity and the higher the adsorption and desorption performance. However, when the meso structure is more than 90%, it was confirmed that it is difficult to expect substantially more adsorption and desorption performance. In the above experimental results, rather than considering other uneconomical problems in the production of activated carbon containing more than 90% mesostructure in the powdered activated carbon may lead to disadvantageous results.

In addition, since it needs to be used semi-permanently as a hydrocarbon trap (HC Trap) car parts attached to the air cleaner of an automobile, adsorption and desorption are continuously performed.

In other words, the adsorption and desorption efficiency is ideally 100% because the adsorption is carried out when the engine is stopped and butane is sucked back into the engine due to the inflow of engine air during operation. However, activated carbon having a 100% meso structure in activated carbon production and structure is impossible.

In particular, when the meso structure of the powdered activated carbon is more than 90%, the effect is not so much improved, but rather it is economically difficult to manufacture and the manufacturing cost is high, so it is preferable to use activated carbon having a meso structure of 90% or less. It was confirmed.

Example 1-4

Powder activated carbon prepared in Preparation Example 2 90㎛ particle size 340g / ㎡, pulp 15g / ㎡, 110 ℃ melting point microfine fiber (10㎛) 80g / ㎡, water repellent 1.3g / ㎡, carbon binder (Ashland Hercopuls ^TM 125) 45g / M², non-woven fabric support 20g / ㎡ using the same basic raw materials and additives, after the suspension process (S110) to make it into a suspension was formed into a web type through a web formation process (S120), the state of the web type After the water discharge step (S130) in and dried through a drying step (S140), where Example 1-4 each contains a base material, using some of the additives, carbon fixing agent or dehydration accelerator, used here SY Chem (SY CHEM Co., Ltd. SB-50N) was used as the carbon fixing agent, and SY Chem (SY CHEM Co., Ltd. C-100) was used as the dehydration accelerator. In this manner, a wet nonwoven fabric for a hydrocarbon trap of a gasoline engine air cleaner was manufactured as an air cleaner in the configuration shown in Table 2 below.

Experimental Example 2: Activated carbon loss rate test of the wet nonwoven fabric for hydrocarbon trap completed from the suspension process (S110) to the drying process (S140)

Activated carbon loss was measured by the method of weight difference before and after the input of the fabric produced in Example 1-4, and the results are shown in Table 2 below.

division	Example 1	Example 2	Example 3	Example 4
	Carbon Fixer 0.6% + Dehydration Accelerator 0.5%	Carbon fixer 0% + Dehydration accelerator 0%	Carbon fixer 0.8%	Dehydration accelerator 0.5%
Dehydration time (sec)	4.5	6.8	5.40	5.2
Fabric weight (g / ㎡)	500.4	510.4	506.2	520.1
Loss weight (g / ㎡)	14.96	68.68	45.9	29.92
Activated Carbon Loss Rate (%)	4.4	20.2	13.5	8.8

Example 5-8, Comparative Example 1-2

After manufacturing the fabric by the method prepared in the same manner as in Example 2, through the heat compression process (S150) to heat compression molding the prepared fabric to 30N / ㎠ ~ 160N / ㎠ at 150 ℃ ~ 230 ℃ conditions The wet nonwoven fabric was manufactured through a process of molding into a fabric, but the wet nonwoven fabric for the hydrocarbon trap of the gasoline engine air cleaner was manufactured as the air cleaner as shown in Table 3 below.

As a comparative example, a wet nonwoven fabric was fabricated by varying the meso structure content of activated carbon and by varying the content of the activated carbon and the fabric thickness.

Experimental Example 3: BWC performance test examining the butane working capacity efficiency (BWC) of the wet nonwoven fabric for hydrocarbon traps, in which the manufacturing process was completed from the suspension process (S110) to the heat compression process (S150).

For the fabrics prepared in Examples 5-8 and Comparative Examples 1-2, the BWC (Butane Working Capacity) performance test, using a standard jig for 3 hours at 110 ± 5 ℃ in a forced circulation oven before the test, the fabric Aspirate dry clean air at 0.031m2, stabilize 28.5 ± 0.5 l / min, and finish when the mass change date is less than 0.1g / 10min, and loading is completed. Aspirate at ml / min, finish / weigh when mass change rate is less than 0.01g / 10min, and purging suck dry dry air at 42l / min, type and weight when mass change rate is less than 0.01g / 10min Measured and repeated three times as an average value, the results are shown in Table 3.

division	Example 5	Comparative Example 1	Example 6	Example 7	Example 8	Comparative Example 2
Fabric weight (g / ㎡)	500	500	550	550	550	330
Fabric thickness (mm)	1.4	1.4	1.6	1.6	2.6	0.7
Activated Carbon Weight (g / ㎡)	340 (68%)	340 (68%)	340 (61.8%)	300 (54.5%)	300 (54.5%)	214.5 (65%)
Specific surface area (㎡ / g)	2,390	1,501	2,389	2,395	2,393	2,396
Meso Structure (%)	80	30	80	80	80	80
Test filtration area (m 2 )	0.031
BWC (g)	3.45	1.52	3.33	3.01	3.04	1.78

Analyzing the above experimental results, when considering the experimental results of Experimental Example 1 presented above as a preparation example, BWC performance test results remarkably when the selected meso structure of the powdered activated carbon is used in a predetermined range It was confirmed to exhibit excellent properties.

In addition, since the heat compression process (S150) is not completely bonded after the activated carbon, pulp, synthetic fibers, carbon binders and additives are dried, a normal gasoline engine inflow flow rate of 2.8m 3 / min can be used, and the gasoline engine air It is confirmed that it is desirable to minimize the thickness by performing a heat compression process because it is mounted on the cleaner to prevent the raw material from being detached, and if the thickness is thick, the pressure loss of the flow path is increased to increase fuel consumption.

Example 9, Comparative Example 3-6

The same activated carbon as in Example 2 is used, and as the synthetic fibers, those having a diameter of 30 μm or less or a melting point of 110 ° C. are used as the melting point microfine fibers. Fibers of different physical properties) were used, but each of the wet nonwoven fabrics was prepared under the conditions shown in Table 4 below.

Experimental Example 4; Ultrasonic welding test

Physical properties were confirmed to evaluate whether the HC TRAP fabric can be used semi-permanently by the detachment force adhesion test of the engine air cleaner housing and the HC TRAP fabric through the ultrasonic fusion test of the wet nonwoven fabric of Example 9 and Comparative Examples 3-6. The test was carried out by the automotive standard ESIR detachment test method, and the ultrasonic welding strength was measured as the fabric weight and fabric thickness were changed. The results are shown in Table 4 below.

division	Example 9	Comparative Example 3	Comparative Example 4	Comparative Example 5	Comparative Example 6
Synthetic fiber	Melting Point 110 ℃ Ultrafine Fiber 10㎛80g / m 2	Melting Point 90 ℃ Ultrafine Fiber 10㎛45g / m 2	Melting Point 280 ℃ Ultrafine Fiber 10㎛80g / m 2	Normal fiber 35㎛80g / m 2	Inorganic Fiber 30㎛80g / m 2
Fabric weight (g / ㎡)	500	465	500	500	500
Fabric thickness (mm)	1.4	1.3	1.8	2.4	2.8
Activated Carbon Weight (g / ㎡)	340 (68%)
Ultrasonic Welding Strength (kgf / Φ35mm)	8.0	5.2	4.3	2.0	0.5

In the above experiments, it was confirmed that the melting point ultrafine fiber of the corresponding range (Example 9) as the synthetic fiber exhibited significantly superior fusion characteristics than the other case (Comparative Example 3-6). These results demonstrate that the effect of preventing the release of powdered activated carbon in the wet nonwoven fabric is excellent, and thus, the reliability of the product is excellent, so that the application of the hydrocarbon trap to the vapor trap is also improved for a long time.

As described above, according to the wet nonwoven fabric for hydrocarbon trap of the gasoline engine air cleaner according to the present invention, the basic raw materials of powdered activated carbon, pulp, synthetic fiber, and carbon binder are used, and if necessary, a dispersant, a water repellent, a carbon fixing agent, and dehydration are additionally used. Evaporated gas generated from the fuel in the combustion chamber of the engine or fuel storage tank while the engine is stopped when the vehicle is stopped. The hydrocarbon contained in the trap is collected on one side of the wet nonwoven fabric for the hydrocarbon trap, and the hydrocarbon trapped on the wet nonwoven fabric for the hydrocarbon trap is recovered to the engine by the negative pressure when the engine is stopped while the engine is running while the vehicle is running, and replayed in the engine. Can be consumed.

In addition, it is composed of powdered activated carbon, pulp, synthetic fiber, basic raw materials and additives of dispersing agent, water repellent, carbon fixing agent, and dehydration accelerator of carbon binder, and formed into a wet nonwoven fabric having a certain thickness through the compression process, so that the vehicle can be driven or stopped. By trapping hydrocarbons in the boil-off gas discharged to the outside to prevent the outflow of hydrocarbons, the main cause of air pollution, the passengers in the vehicle can minimize the damage caused by the hydrocarbon gas.

Although specific embodiments of the present invention have been described in detail above, the present invention is not limited thereto, and the present invention can be variously modified by those skilled in the art to which the present invention pertains. Is included in the scope of the present invention.

Claims (10)

1. The wet nonwoven fabric for the hydrocarbon trap of the gasoline engine air cleaner is installed in the gasoline engine air cleaner, and the hydrocarbons in the boil-off gas generated from the fuel in the combustion chamber of the engine or the fuel storage tank when the vehicle is stopped or the engine is collected or the collected hydrocarbons are collected. In the wet nonwoven fabric for hydrocarbon traps to be recovered to the side to be reburned,

   Powdered activated carbon, pulp, synthetic fibers, containing a basic raw material including a carbon binder, the powdered activated carbon is an average particle size of 20㎛ ~ 150㎛ range, the meso structure is contained in the range of 45 ~ 90%, the synthetic fiber The wet nonwoven fabric for a hydrocarbon trap of the gasoline engine air cleaner characterized by including a diameter of 30 micrometers or less and melting | fusing point of 110 degreeC-270 degreeC.
2. The method of claim 1, wherein the synthetic fibers are ultra-fine fibers, ultra-fine fibers, split yarn or island-in-the-sea yarn; Or a hydrocarbon trap of a gasoline engine air cleaner comprising one or more synthetic fibers selected from Sheath / Core or Side by Side type composite melting point fibers selected from PP / PE, PET / PE, PET / PP or PET / NYLON. Wet Nonwovens.
3. The gasoline according to claim 1, wherein the basic raw material comprises 45 to 80% by weight of the powdered activated carbon, 3 to 13% by weight of the pulp, 10 to 30% by weight of synthetic fibers, and 3 to 12% by weight of the carbon binder. Wet nonwoven fabric for hydrocarbon traps in engine air cleaners.
4. The method according to claim 3, in addition to the base material, the dispersant is contained in the content of 0.05 to 2.0% by weight, the water repellent is in the amount of 0.2 to 1.0% by weight, the carbon fixing agent is in the content of 0.05 to 1.0% by weight, and dewatering The accelerator is a wet nonwoven fabric for a hydrocarbon trap of a gasoline engine air cleaner, characterized in that it comprises any one or more in an amount of 0.05 to 1.0% by weight.
5. The wet nonwoven fabric for a hydrocarbon trap of a gasoline engine air cleaner according to claim 1, wherein the powdered activated carbon has a specific surface area of 1,000 to 3,000 m 2 / g.
6. Gasoline engine air installed in the gasoline engine air cleaner, which collects hydrocarbons in the boil-off gas generated from the combustion chamber of the engine or fuel in the fuel storage tank or recovers the collected hydrocarbons to the engine side when the vehicle is stopped or running. In the method for producing a wet nonwoven fabric for a hydrocarbon trap of a cleaner,

   Prepare a basic raw material including powdered activated carbon, pulp, synthetic fibers, and carbon binders, wherein the powdered activated carbon uses activated carbon having an average particle size in the range of 20 μm to 150 μm and a meso structure in the range of 45 to 90%. Preparing a basic raw material using synthetic fibers having a diameter of 30 μm or less and melting points of 110 ° C. to 270 ° C. as synthetic fibers;

   Undergoing a suspension process of making the basic raw material into a suspension;

   Forming a base material that has undergone the suspension process into a web type through a web formation process;

   Undergoing a water discharge process in the web type state;

   Drying through the drying process after the water is discharged; And

   After the drying process, the step of forming a sheet or roll-type fabric through a heat compression process to heat compression molding

   Method for producing a wet nonwoven fabric for a hydrocarbon trap of a gasoline engine air cleaner comprising a.
7. The method according to claim 6, wherein the synthetic fibers are ultra-fine fibers, ultra-fine fibers, split yarn or island-in-the-sea yarn; Or a hydrocarbon trap of a gasoline engine air cleaner comprising at least one synthetic fiber selected from a composite melting point fiber of Sheath / Core or Side by Side type selected from PP / PE, PET / PE, PET / PP or PET / NYLON. Method of producing a wet nonwoven fabric.
8. The gasoline according to claim 6, wherein the basic raw material comprises 45 to 80% by weight of the powdered activated carbon, 3 to 13% by weight of the pulp, 10 to 30% by weight of synthetic fibers, and 3 to 12% by weight of the carbon binder. Method for producing a wet nonwoven fabric for a hydrocarbon trap of an engine air cleaner.
9. The method according to claim 7, wherein in addition to the basic raw material, the dispersant is contained in an amount of 0.05 to 2.0% by weight, the water repellent is in an amount of 0.2 to 1.0% by weight, and the carbon fixing agent is in an amount of 0.05 to 1.0% by weight, based on the total nonwoven fabric. The accelerator is a method for producing a wet nonwoven fabric for a hydrocarbon trap of a gasoline engine air cleaner, characterized in that it comprises any one or more in an amount of 0.05 to 1.0% by weight.
10. The method of claim 6, wherein the heat compression process is compression-molded to a weight of 300 ~ 800g / ㎡, weight of 0.6 ~ 1.8mm through a heat compression process for a weight of 300 ~ 800g / ㎡, thickness of 2.2 ~ 3.6mm The manufacturing method of the wet nonwoven fabric for hydrocarbon traps of the gasoline engine air cleaner which consists of these.

Images