JPH0411943A - Production of fuel absorber - Google Patents

Abstract

PURPOSE:To obtain a fuel absorber having superior durability and evaporated fuel capturing ability by allowing an org. high molecular compd. having fuel capturing function to react with a cross-linking agent, coating a carrier with the resulting fine particles of polymer gel and drying the particles. CONSTITUTION:An org. high molecular compd. having fuel capturing function such as PP or PE is dissolved in a solvent such as benzene or toluene and the resulting soln. is added to a soln. contg. a dispersant such as PVA or gelatin under stirring. A reaction is allowed to take place in the presence or a cross- linking agent such as benzoyl peroxide. After the end of the reaction, fine particles 50 of polymer gel are collected, a carrier 55 such as plastics or ceramics is coated with the particles 50 without removing the residual dispersant 52 and the particles 50 are dried to obtain a fuel absorber 5 having superior durability to the cycle of absorption and desorption and superior evaporated fuel capturing ability.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing a fuel absorber used in a fuel evaporation prevention device.

[Prior art]

When fuel is supplied into the fuel tank of an automobile by a refueling gun, a relatively large amount of fuel evaporates.

Additionally, a portion of the fuel in the fuel tank and the float chamber of the carburetor evaporates both when the vehicle is running and when it is stopped.

Therefore, in order to prevent these evaporated fuels from leaking into the atmosphere, canisters (fuel evaporation prevention devices) filled with a fuel absorber are connected to these tanks and the like. This fuel absorber is for capturing evaporated fuel. In addition, evaporated fuel from fuel storage tanks, etc. is not limited to automobiles,
Further, in order to capture leaked fuel liquid, a fuel evaporation prevention device similarly filled with a fuel absorber is used.

Activated carbon has conventionally been used as the fuel absorber. The fuel adsorbed on activated carbon.

Released from activated carbon during purge. Therefore,
Activated carbon is used by repeatedly adsorbing and desorbing fuel (see FIG. 5, which will be described later).

[Problem to be solved]

However, canisters using the activated carbon described above often fail to capture evaporated fuel, and the evaporated fuel ends up being released into the atmosphere.

When the cause of this was investigated, it was found that when activated carbon comes into contact with liquid gasoline, the ability of activated carbon to trap one gas of gasoline is significantly reduced.

Furthermore, what causes activated carbon to come into contact with liquid gasoline?

It turned out that this was because liquid gasoline condensed on the piping connected to the canister and on the wall above the canister came into contact with the activated carbon.

Note that the condensation of gasoline vapor as described above occurs in the surrounding pipes and the space above the canister, especially when the outside temperature is high and the vapor pressure of gasoline in the fuel tank or vaporizer is very high.

In addition, the vapor trapping ability (working capacity) of activated carbon
Another reason for the decline is that among the evaporated fuel molecules adsorbed on activated carbon, small molecules with less than 4 or 5 carbon atoms are easily released during the canister purging process.
Molecules larger than this are difficult to release. Also, therefore, the vapor trapping capacity decreases as the time of use of the canister increases.

It has also been proposed to use organic polymers such as propylene and styrene-butadiene copolymers as fuel absorbers in place of activated carbon (Japanese Patent Laid-Open Nos. 1-67222 and 1227861). However, the fuel absorption capacity of the fuel absorber decreases while repeating a cycle of fuel absorption and desorption (adsorption/desorption cycle).

The reason for this is thought to be as follows. Primary particle strength, 1
Since the bonding force between the primary particles (strength of the secondary particles) is weak, swelling during absorption and contraction during separation occur repeatedly, and furthermore, vibration and the like cause destruction of the primary particles and collapse of the secondary particles. Such fine particles are easily scattered and cause unevenness of the absorbent, resulting in a decrease in absorption capacity. Furthermore, when one particle becomes finer, the porosity decreases, which makes clogging more likely to occur during swelling, and the absorption capacity decreases.

In view of these conventional problems, it is an object of the present invention to provide a method for manufacturing a fuel absorber that has excellent durability against the above-mentioned adsorption/desorption cycle and has an excellent ability to capture evaporated fuel.

[Means for solving problems]

In the present invention, an organic polymer compound having a fuel trapping function is dissolved in a solvent, and then the solution is added to a separately prepared dispersant-containing solution with stirring, and a crosslinking agent for the organic polymer compound reaction is present. The fuel absorber is characterized in that a reaction is carried out below, and after one reaction is completed, polymer gel fine particles are collected, and the polymer gel fine particles are coated on a carrier with the dispersant remaining, and then dried. It's in the manufacturing method.

What is most noteworthy about the present invention is that an organic polymer compound having a fuel trapping function is reacted in a dispersant solution using a crosslinking agent, and then the polymer gel particles obtained by the reaction are collected. Without removing the dispersant adhering to the cough polymer gel fine particles, or leaving a portion of the dispersant, the polymer gel fine particles are applied to a carrier and dried,
The purpose is to manufacture fuel absorbers.

In the present invention, an organic polymer compound having a fuel trapping function refers to an organic polymer compound having a function of trapping evaporated fuel (including leaked fuel liquid) and capable of crosslinking at least to the extent of forming a gel. . Moreover, the trapping function here refers to the property of being dissolved in or swollen by the fuel.

Moreover, the above-mentioned reaction refers to any chemical reaction including crosslinking and/or polymerization reaction of the above-mentioned organic polymer compound.

These reactions are carried out by suspension polymerization or emulsion polymerization in the presence of the above-mentioned dispersant.

Examples of organic polymer compounds having the above properties include polypropylene, polyethylene, polyisoprene, polybutadiene, and polyisobutylene.

Polystyrene, polynorbornene, polysiloxane, ethylene-propylene-diene copolymer.

Styrene-butadiene copolymer, ethylene-propylene copolymer, isobutylene-isoprene copolymer,
Butadiene-acrylonitrile copolymer, ethylene-
Vinyl acetate copolymer, acrylic polymer, styrene
The isoprene copolymer polyepichlorohydrin is used.

In addition, toluene and benzene are used as solvents when reacting these organic polymer compounds.

Xylene, dimethylbenzene, trimethylhenzene, cyclohexane, pentane 5 Hexane, heptane, methylene chloride, chloroform, carbon tetrachloride trichloroethylene, etc.

Further, the ratio of the organic polymer compound to the solvent is 2 to 50% (weight ratio, the same hereinafter).

The solvent content is preferably 50 to 98%.

Next, as a crosslinking agent, hengeyl peroxide,
Diacyl peroxides such as lauroyl peroxide, hydroperoxides such as 2,4.4-)dimethyl pentyl-2-hydroperoxide, dialkyl peroxides such as dicumyl peroxide, I, 1 Di-t-butyl peroxy-3,3,5
- Peroxyketals such as trimethyl cyclohexane, alkyl peresters such as t-butyl peroxy-neodecanoate, percarbonates such as bis(4-t-butyl cyclohexyl) peroxy dicarbonate, methyl ethyl ketone peroxide There are peroxide-based crosslinking agents such as ketone peroxides.

Also, sulfur, sulfur compounds, and amine compounds.

Commonly used crosslinking agents such as epoxy compounds and carboxy compounds can also be used.

Further, if the two reactions are insufficient, a crosslinking aid is added.

Examples of such crosslinking aids for the above peroxide crosslinking agents include tetrahydrofurfuryl methacrylate, ethylene dimethacrylate, 1,3-butylene dimethacrylate, polyethylene glycol dimethacrylate, and 2-2゜bis( 4-methacryloxy jetoxy phenyl)propane, aluminum methacrylate.

Examples include calcium dimethacrylate, triallyl isocyanurate, diallyl phthalate, divinyl benzene, P-quinone dioxime, 12-polybutadiene, and sulfur. On the other hand, for crosslinking agents other than the above-mentioned peroxide-based crosslinking agents.

A commonly used crosslinking aid is used.

In addition, the crosslinking agent is 1 to 20% of the organic polymer compound,
Similarly, the crosslinking aid is added in an amount of 0 to 20%.

In addition, prior to performing the above reaction, it is preferable that the organic polymer compound solution is deoxidized.
For example, there is a method of bubbling nitrogen gas.Also, there is a method of repeatedly evacuating a container containing a solution and then filling it with N2 gas.This removes dissolved oxygen from one reaction solution. Let it be released.

Next, the above solution is added to a solution containing one dispersant while stirring to prepare a dispersion while heating and keeping at 540 to 55°C. Then, heat until the crosslinking agent is almost completely decomposed.
Continue stirring for one reaction.

As the dispersant, polyvinyl alcohol (PVA)
, gelatin, gum tragacanth, gum arabic, starch, methylcellulose, carboxymethylcellulose,
There are polyacrylates, etc. Further, it is preferable that the solution containing the dispersant 1 is also subjected to deoxidation treatment in the same manner as above. Furthermore, water is usually used as the solvent for the solution.

Also.

The concentration of the dispersant in the solution is about 1 to 5%.

After the reaction is completed, when it is cooled, the polymer obtained by the reaction and the solution are separated into upper and lower parts. Therefore.

A cream-like paste is obtained by collecting the upper polymer phase. This is the polymer gel fine particles. The polymer gel fine particles contain a fine particle polymer having a particle size of 10 to 100 μm, a solvent, a dispersant, and the like.

Therefore, the polymer gel particles in the form of fresh cream are applied to the surface of the carrier and then dried. As a result, the solvent is released, a large number of the fine particles of the polymer are attached by the dispersant, and a porous fuel absorber is obtained in which the particles are attached to the surface of the carrier.

The above-mentioned carrier includes a granule, a plate, cloth, and a net.

There are threads, etc. Furthermore, the material of the carrier includes plastics, ceramics, metals, and the like. Further, as a method for applying the polymer gel fine particles to the carrier, there is a dipping method in which the carrier is immersed in the polymer gel fine particles and then pulled up. There is also a method in which the above-mentioned polymer gel particles in the form of fresh cream are diluted with water or a solvent, or applied without dilution onto the surface of a carrier using a spray gun or the like. Furthermore, there is also a roll coater method in which the above-mentioned fresh cream-like polymer gel fine particles are attached to a roll and applied to a carrier.

Further, the fuel absorber is in a state in which the fine particulate polymers are bonded to each other by a dispersant such as PVA remaining on the surface (see FIGS. 1 and 2). The dispersant has a role as a binder. These particles adhere to the carrier in a layered manner, and the particulate polymers are also bonded to each other by a dispersant, forming a porous spatial structure with good fuel absorption.

In addition, when the above-mentioned fresh cream-like polymer gel particles immediately after the 9 reaction are washed with warm water at 50 to 70°C, the 9 dispersion side is
Unreacted organic polymer compound, crosslinking agent.

A finely divided polymer from which the crosslinking aid has been removed is obtained. Therefore,
There is a method in which 1) this washing is interrupted when a small amount of the dispersant remains, and then high □ molecular gel particles are applied onto the carrier and 2 is dried. In this case as well, the dispersant plays the role of a binder, and a fuel absorber with a carrier in which finely divided polymers are bonded to each other is obtained.

In addition to the above method, there is a method of washing using a solvent in which the dispersant is insoluble. In this method, the above-mentioned fresh cream-like polymer gel microparticles are used immediately after the reaction.

By washing with the above solvent, a fine particulate polymer with residual dispersant adhering to one surface is obtained. Then, by applying this onto a carrier in the same manner as above and drying it, it is possible to obtain a fuel absorber with a carrier in which fine particulate polymers are bonded to each other by a dispersant.

An example of a solvent in which the above dispersant is insoluble is toluene.

Examples include ethyl alcohol. In addition, due to the above washing,
Unreacted organic polymer compounds, crosslinking agents, and crosslinking aids are removed, leaving only one dispersant.

Next, it is preferable to further coat the surface of the above fuel absorber with a reactive substance.This coating further increases the strength of the fuel absorber and improves its durability during adsorption and desorption cycles. . In addition, when ensuring the porosity between the particulate polymers is important, it is desirable to limit the capacity of the reactive substance to a certain extent so that these pores are not blocked by the coating.

Such a reactive substance refers to a substance having reactivity such as crosslinking or chain extension. Specifically, it is preferable to use a thermosetting resin such as urethane type, epoxy type, silicone type, or amino type.

Coating methods include a method in which a solution (1 to 50%) of the above-mentioned reactive substance is sprayed onto the surface of the fuel absorber, a method in which the fuel absorber is immersed in the solution, and the like. In addition, as a solvent for this solution, aromatic hydrocarbons,
Aliphatic hydrocarbons, alcohols, ketones, water, etc. are used. Further, the coating layer preferably has flexibility and can follow excessive deformation.

Further, the thickness of the coating is preferably 0.1 to 500 μm. If it is less than 0.1 μm, the strength will not be improved much, and if it exceeds 500 μm, the fuel trapping ability of the fuel absorber may be significantly reduced.

Further, it is preferable that the above coating is applied in the same manner to the fuel absorber manufactured from the polymer gel fine particles washed with warm water, and also to the fuel absorber manufactured from the polymer gel fine particles washed with a dispersant-insoluble solvent. .

Furthermore, the fuel absorber obtained as described above has basically the same shape as the carrier, but it can also be shaped into a desired shape, such as a honeycomb shape, a plate shape, a film shape, etc. However, if the thickness of the particulate polymer layer increases, only one surface will swell, and absorption will not proceed to the inside, which may reduce absorption capacity. Therefore, it is preferable that the thickness of the fine particulate polymer layer on the carrier is 5 mm or less.
(absorption), but is insoluble in fuel. Therefore, by purging the captured fuel, it can be regenerated and its use can be repeated.

Note that the fuel absorber of the present invention can be used not only for automobile canisters but also for various fuel evaporation prevention devices such as boiler fuel tanks.

In addition, the porous fuel absorber obtained in the present invention is
Fine particles of an organic polymer compound having a fuel-trapping function are bonded to each other by a binder to form a spatial structure filled with pores, and are attached to a carrier.

What should be noted in this invention is that the absorber, which is constructed using a carrier as a skeleton, has high strength against impacts, etc., and there is no risk of uneven distribution within the fuel absorption chamber, and furthermore, the fuel absorption efficiency of the particles that constitutes a spatial structure that is filled with pores is high. is a high point.

[Action and effect]

In the present invention, the fuel absorber obtained by the above manufacturing method consists of a carrier and a fine particle polymer layer provided in a layered manner on the surface of the carrier. Since the fine particulate polymer layer (5) is based on the organic polymer compound, it has a high ability to trap evaporated fuel. This high trapping ability is based on the ability of this organic polymer compound to absorb fuel such as gasoline and swell. This is because the above-mentioned existing polymer compound has a high affinity with the evaporated fuel.

In addition, since the fuel absorber has a carrier as a skeleton,
Its overall strength is high. Furthermore, since the fine particle polymer layer is provided on the surface of the carrier, pores are formed between the fine particle polymers.

The ratio of surface area to volume of the particulate polymer is large. Therefore, the fuel absorption capacity per unit weight of the particulate polymer is high.

Further, the fuel absorber is obtained by reacting the organic polymer compound with a crosslinking agent7, and the dispersant used in this reaction is used as it is as a binder for the fuel absorber. Therefore, there is no need to separately add or mix a binder when producing a fuel absorber.

Furthermore, in the fuel absorber according to the present invention, the fine particulate polymers are bonded to each other by the dispersant, so that the overall strength is improved. Therefore, it has excellent durability against the adsorption/desorption cycle of fuel capture and release. Further, when coating as described above, the -layer strength is improved.

Further, since the organic polymer compounds are chemically bonded to each other through a reaction, the obtained fuel absorber has a three-dimensional structure. Therefore, the whole structure is highly flexible and has a high fuel capture ability.

Note that the fuel absorber, which has swelled due to absorbing evaporated fuel, releases the trapped fuel during the process of purging the inside of the fuel evaporation prevention device, restores its evaporative fuel absorption ability, and can be used continuously. can.

As described above, according to the present invention, it is possible to provide a method for manufacturing a fuel absorber that has excellent durability against fuel adsorption/desorption cycles and has excellent evaporated fuel trapping ability.

〔Example〕

First Embodiment This is an embodiment of the present invention. The method for manufacturing the fuel absorber will be explained.

First, as an organic polymer compound with a fuel capture function,
Ethylene-Propylene-Ethylidene Norbornene Polymer (Japan Synthetic Rubber EP33. Ethylene-Propylene-
Diene copolymer) was dissolved in toluene to make a 10% (weight ratio, same hereinafter) solution (solution amount: 800 g).

To this solution, 20 parts of benzoyl peroxide as a crosslinking agent was added and dissolved in terms of pure product (100%) based on 100 parts (parts by weight, same hereinafter) of the polymer. Furthermore, 20 parts of divinylbenzene as a crosslinking aid was added and dissolved in 100 parts of the polymer. N2 gas was bubbled through the polymer solution prepared in this way to perform deoxidation treatment to remove dissolved oxygen in the solution.

On the other hand, polyvinyl alcohol (PVA) as a dispersant (polymerization degree 500, saponification degree 86.5) was placed in a pressure-resistant container.
Prepare a 1% aqueous solution of ~89 mol%) (solution volume 220
Then, a dispersion stirrer was fixed on the top of the pressure container and the container was sealed.Next, after evacuating the inside of the pressure container, the operation of filling with N2 gas was performed three times, and the PV
Deoxygenation treatment was performed to remove dissolved oxygen in the A aqueous solution.

Thereafter, the deoxidized polymer solution was poured into a PVA aqueous solution in a pressure-resistant container and stirred at high speed using the dispersion stirrer to prepare a dispersion.

Further, after the polymer solution had finished flowing in, the inside of the pressure-resistant container was subjected to deoxidation treatment in the same manner as described above, and stirring was continued for 15 minutes.

Next, the dispersion stirrer was replaced with a simple propeller stirrer, and the reaction solution in the pressure-resistant container was stirred at 120 to 300 rpm while increasing the temperature to 92°C. After reaching 92°C, the above stirring was continued for another 6 hours, and then a 20% toluene solution on the antioxidant side (polymerization inhibitor) was added to the reaction solution to stop the 9 reactions.

After the reaction was completed, the pressure container was cooled with ice water and left at room temperature for 3 hours. As a result, fresh cream-like polymer gel particles are separated into the upper layer and an aqueous solution is separated into the lower layer. Therefore, the upper layer of polymer gel particles is collected.

Thereafter, the polymer gel fine particles were applied to the surface of the carrier as they were without washing.

As the carrier, a nylon fiber body having a diameter of about 0.5 strands was used. Further, the above coating is carried out by immersing the carrier in a bath of the fresh cream-like polymer gel particles.

This was done by the pulling method. Further, the whole was then dried by air-drying at room temperature. Due to this.

A fibrous fuel absorbent with a carrier having a diameter of about 0.7 mm was obtained. This fuel absorber is designated as sample N11l.

As shown in the model in FIG. 1, the fuel absorber manufactured in this manner consists of a fine particulate polymer 50 produced by the crosslinking reaction of the organic polymer compound, and a dispersing agent attached around the fine particulate polymer 50. It consists of PVA 52 and a carrier 55 supporting them. That is, the PVA 52 acts as a binder to bond each particulate polymer 50 to the surface of the carrier 55, thereby forming the fuel absorber 5.

Also, regarding the fine particulate polymer on the above carrier.

Photographing the particle state using a scanning electron microscope (magnification 9
The results are shown in Figure 2.

In the same figure, the fine spherical objects represent the fine particulate polymer in a dry state. Then, on the surface of the fine polymer particles, P
It is attached so that it is coated with VA.

Second Example 100g of the fresh cream-like polymer gel fine particles produced in the first example above was collected and soaked in 60°C hot water with 0.
It was washed at 22. Then, the fine polymer gel particles with PVA still remaining were obtained.Next, the fine polymer gel particles were applied to a carrier in the same manner as in the first example, and dried to obtain a fuel absorber. .

The rest was the same as in the first example. This fuel absorber is designated as sample N112.

Furthermore, when scanning electron micrographs were taken of the fuel absorber in the same manner as in the first example (as shown in the diagram), PVA remained in some places on the surface of the finely divided polymer and between the finely divided polymers. It was attached.

Third Example 100 g of the creamy polymer gel fine particles produced in the first example were collected and washed with 0.41 g of isopropyl alcohol solvent in which the dispersant was insoluble.

As a result, the unreacted organic polymer compound, crosslinking agent, and crosslinking aid were washed away, and PVA as a dispersant remained on the surface of the finely divided polymer. Thereafter, it was applied to a carrier in the same manner as in the first example and dried to form a fuel absorber. The rest was the same as in the first example. This fuel absorber was used as sample Nα3.
shall be.

Even in this fuel absorber, on the surface of the fine polymer particles,
PVA remained to cover it.

Fourth Example The fuel absorber obtained in the first example was further coated with a reactive substance.

That is, first, a polyurethane adhesive (Nippon Polyurethane Kogyo ■, Nipporan 3124/Coronate L = 100 parts/10 parts) as a reactive substance was mixed in toluene to form a 20% solution to form a homogeneous solution.

Thereafter, the fuel absorber obtained in Example 1 was immersed in the solution for 2 minutes, taken out, and placed in a hot air circulation constant temperature bath at 60°C for 7 minutes.
The polyurethane adhesive on the two surfaces was left to stand for 0 hours to harden.

This resulted in a fuel absorber coated with one reactive substance. This fuel absorber is designated as sample size 4.

As shown schematically in FIG. 3, this coated fuel absorber has a main body portion made up of fine polymer particles 50 bonded to each other by PVA 52 on the surface.

a coating layer 6 covering the main body portion;

It consists of a carrier 55 carrying these.

Further, FIG. 4 shows a scanning electron micrograph (magnification: 72 times) similar to that of the first example, regarding the state of particles on the surface of the coated fuel absorber.

As can be seen from FIG. 4, in the coated fuel absorber, the periphery of the fine particulate polymer is coated with a reactive substance (compared with FIG. 2).

Fifth Embodiment This is shown in the second embodiment. A fuel absorber obtained by washing fine polymer gel particles with hot water was coated in the same manner as in the fourth example. A coated fuel absorber was thus obtained. This fuel absorber is designated as sample No. 5.

Sixth Embodiment This is shown in the third embodiment. A fuel absorber obtained by washing fine polymer gel particles with a dispersant-insoluble solvent was coated in the same manner as in the fourth example.

A coated fuel absorber was thus obtained. This fuel absorber is designated as sample Nα6.

Seventh Example Sample Nos. 1 to 6 obtained in the above first to sixth examples
The characteristics of the fuel absorber were measured.

That is, first, regarding the fuel adsorption/desorption cycle durability, each fuel absorber was placed in a 100-mesh stainless wire mesh container, and these were immersed in toluene for 24 hours. Then, a load was applied from above to the fuel absorber immediately after it was taken out, and the load (gf) at the time of pulverization was measured.

As for the fuel capture ability of the fuel absorber, first about 0.2 g of each sample (including about 0.1 g of carrier) is placed in a wire mesh container (weight: ■) similar to the above and weighed. One weight at this time is assumed to be W. and.

Each sample is immersed together with a wire mesh container in toluene as a fuel, taken out at intervals shown in Table 1, and the weight y of each sample is weighed. Then, by the formula below, the fuel absorption rate (%
) was calculated.

W-■ The measurement results are shown in Table 1.

For comparison, fresh cream-like polymer gel particles were collected in Example 1 and thoroughly washed with warm water. Then, in a state in which no PVA remained, this was applied onto a carrier and dried to obtain a fuel absorber. This is designated as sample NaCl.

The measurement results are also shown in Table 1.

As can be seen from Table 1, the fuel absorbers according to the present invention (sample floors 1 to 6) all exhibit higher crushing loads than the comparative sample NctC1. This is because each particulate polymer is bonded by PVA, which is the 9-dispersion side, and the fuel absorbent body as a whole has high strength.

In addition, sample floor 2 has less PVA than Nα1 and 3, so the 2 intensity is slightly lower. In addition, samples Nα4 to Nα6 are coated samples on samples Nos. 1 to 3,
It can be seen that the coating significantly improves the strength of the fuel absorber.

Therefore, the fuel absorber of the present invention exhibits excellent durability against fuel adsorption and desorption cycles. Also.

Regarding fuel capture performance, it can be seen that it exhibits high absorption.

Furthermore, since the fuel absorber of the present invention has a carrier as a skeleton in the center, its overall strength is high.

Furthermore, since the fine particulate polymer having fuel absorption capacity is provided only on the surface of the carrier, the fuel absorption capacity per unit weight is high.

On the other hand, comparative sample C1 in which PVA was completely removed by washing
Although the absorbance is very high, the fine particulate polymer is PV
Because they are not joined by A.

The crushing load during fuel absorption is quite low. Therefore, the durability of the adsorption/desorption cycle is poor.

Eighth Embodiment An example in which the fuel absorber of the present invention is used in an automobile canister will be explained with reference to FIG.

As shown in the figure, this canister 1 includes a main body 10 that is a container that accommodates a fuel absorber, and an absorption chamber 2 in the main body 10.
The fuel absorber 20 is filled with a fuel absorber 20.

The main body 10 has a cylindrical shape, and a lid 11 is provided at the upper end of the main body 10.
and a bottom plate 12 provided on the bottom surface. In addition, a second introduction pipe 14 with a tip 141 inserted into the lid 11 up to the vicinity of the center of the absorption chamber 2. The first introduction pipe 13 inserted in the same way
．． and fix the purge pipe 16.

The first introduction pipe 13 communicates with the space above the carburetor float chamber 81, and the second introduction pipe 14 communicates with the fuel tank 82. Further, the purge pipe 16 communicates with a purge port 85. Further, a purge air pipe 15 is opened at the bottom Fi12. Each of the above pipes has a valve 131, 142, 151, 161, respectively.

Further, in one main body 1O, a perforated plate 17 is provided below the absorption chamber 2, and a perforated plate 18 is provided above it.

Further, the perforated plate 17 is pressed upward by a spring 101, and the perforated plate 18 is pressed downward by a spring 102. In addition, in the same figure, 8 is gasoline.

Therefore, the capture of evaporated fuel by this canister l is
As mentioned above, the carburetor float chamber 81 or the fuel tank 8
Gasoline vapor evaporated in step 2 enters the absorption chamber 2 in the canister 1 through the first or second introduction pipe 13, 14, contacts the fuel absorber 20, and is absorbed therein. During this absorption, the valves 131, 142 of the introduction pipe 13, 14 are open, and the valve 161 of the purge pipe 16 and the valve 151 of the purge air pipe 15 are closed.

The above absorption occurs when the fuel absorber 20 traps gasoline and swells.

When these fuel absorbers have absorbed a large amount of gasoline vapor, the fuel absorbers are regenerated. After repeated use, the lid If is removed and replaced with a new fuel absorber.

The above reproduction is based on the above answer 131, 142, 151.16.
1 is opened and closed by supplying air from the purge air pipe 15 in the opposite manner to the time of absorption. and,
Upper purge pipe] Purge exhaust gas from 6 to purge boat 8
Discharge to 5. At this time, the introduced air serves to separate the gasoline absorbed by the fuel absorber and discharge it as described above.

By carrying out the adsorption/desorption cycle of absorption and regeneration as described above, the fuel absorber can be used repeatedly and gasoline vapor as y-generated fuel can be captured with high efficiency.

[Brief explanation of drawings]

FIGS. 1 and 2 show the first embodiment, and FIG.
The figure is a scanning electron micrograph showing the particle structure of the finely divided polymer after drying, and Figures 3 and 4 show the fourth example.
Fig. 3 is an explanation of the bonding state of fine particulate polymer in the fuel absorber, Fig. 4 is a scanning electron micrograph showing the particle structure in the fuel absorber after coating, and Fig. 50 is an 8th
It is an explanatory view of a canister in an example. 110. Canister 200. absorption chamber, 20. ,,Fuel absorber. 510. fuel absorber. 50, , Fine particulate polymer 52, , PVA 693. coating layer. 891. gasoline

Claims (6)

[Claims] (1) An organic polymer compound having a fuel capture function is dissolved in a solvent, and then the solution is added to a separately prepared dispersant-containing solution with stirring, and in the presence of a crosslinking agent for organic polymer compound reaction. After the reaction is completed, the polymer gel particles are collected, and the polymer gel particles are coated on a carrier with the dispersant remaining, and then dried. Method. (2) In the first claim, the polymer gel fine particles contain 50
A method for producing a fuel absorber, which comprises washing with warm water at ~70°C until a small amount of the dispersant remains, and then applying the dispersant to a carrier and drying it. (3) Manufacturing the fuel absorber according to claim 1, characterized in that the polymer gel particles are washed with a solvent in which the dispersant is insoluble, and then applied to a carrier with the dispersant remaining and dried. Method. (4) A method for producing a fuel absorber according to any one of claims 1 to 3, characterized in that the carrier is a granular body, a plate-like body, a cloth, a net, or a thread. (5) A method for manufacturing a fuel absorber according to any one of claims 1 to 3, further comprising coating with a reactive substance after drying. (6) In the fifth claim, the reactive substance is urethane-based,
A method for producing a fuel absorber characterized by using an epoxy-based or silicone-based thermosetting resin.