JPH03131A - Impregnating method for liquid chemical by vacuum and pressurization and device utilized therefor - Google Patents

Abstract

PURPOSE:To efficiently impregnate the porous material with the necessary minimum amount of liquid chemical by repeatedly spraying this liquid chemical toward the porous material from the upper part thereof and performing impregnating treatment. CONSTITUTION:The porous material is charged into a treatment tank 20 fitted with an opening and closing cover. This treatment tank 20 is sealed and the inside thereof is evacuated by a vacuum pump 37. Liquid chemical 25 in a storage tank 24 is supplied into the evacuated tank 20. Then a circulation pump 29 is actuated and the liquid chemical is sprayed toward the porous material from the upper part thereof by a spraying means 23. Compressed air is supplied into the tank 20 completed with spraying of liquid chemical via a pressure controlling path 32 to pressurize the inside of the tank 20 at the prescribed pressure. The liquid chemical 25 which is stuck and remains on the surface of the porous material is forcedly penetrated into the insides of the gaps. As a results, the porous material is impregnated with the necessary minimum amount of liquid chemical.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of impregnating a porous material such as wood, cardboard, casting, ceramics, etc. with a chemical solution to modify the porous material, and an apparatus used therefor. It is related to.

[Conventional technology]

BACKGROUND ART Recently, it has been widely practiced to impregnate porous materials such as wood, cardboard, castings, and ceramics with chemical solutions to modify the porous materials. For example, low-cost, soft wood or cardboard can be impregnated with a resin solution to increase its strength and used for furniture, fittings, wall materials, etc., or castings or bricks can be impregnated with a resin solution to make the structure denser and crack the structure. Efforts are being made to make it more difficult. Furthermore, by impregnating the impregnated material with a chemical solution with special medicinal properties instead of a resin solution, it is also possible to improve the storage stability of the impregnated object and to improve its performance such as waterproofness and conductivity.

For example, an apparatus shown in FIG. 5 is used for impregnating such a porous material with a chemical solution. This device includes a processing tank 2 sealed by an opening/closing lid 1, an inner tank 3 loaded into the processing tank 2, and a vacuum pump 6 communicated with the processing tank 2 through a pipe 5 with a pressure reducing valve 4. , and a pressurizing means (not shown) communicated by a pipe 8 with a pressurizing valve 7.

Further, reference numeral 10 denotes a chemical solution storage tank for supplying an impregnating chemical solution into the processing tank 2, which is communicated with the processing tank 2 via a pipe 12 with an on-off valve 11. Then, this inner tank 3 is filled with a porous material 13 such as wood and loaded into the processing tank 2,
After the processing tank 2 is sealed with the opening/closing lid 2, the vacuum pump 6 is first operated, and then the pressure reducing valve 4 is opened to reduce the pressure and evacuate the inside of the processing tank 2. As a result, air, moisture, etc. contained in the porous voids of the porous material 13 are removed. Next, the pressure reducing valve 4 is closed, the vacuum pump 6 is stopped, and the opening/closing valve 11 is opened while maintaining the vacuum state, and the chemical liquid in the chemical liquid storage tank 10 is supplied into the processing tank 2 and stored up to the position shown by the chain line A in the figure. Porous material 13 is immersed in a chemical solution. Then, while closing the on-off valve 11, the pressurizing valve 7 is opened to pressurize the inside of the processing tank 2. As a result, the pores of the porous material 13 are forcibly impregnated with the chemical solution. Impregnation of the porous material 13 can be carried out in this way.

[Problem that the invention seeks to solve]

However, in the impregnation method as described above, the entire porous material 13 is immersed in the chemical solution, which requires a large amount of the chemical solution, which is not economical. Therefore, it has been proposed that the chemical solution removed from the treatment tank 2 be collected and reused in the storage tank 10, but this is because the chemical solution is contaminated by substances eluted from the porous material during the pressure impregnation process. Since the quality of the impregnated products using this recovered chemical solution is inferior, the chemical solution cannot be used repeatedly.

The present invention was made in view of the above circumstances, and aims to provide an impregnation method that requires only the minimum necessary amount of chemical solution when impregnating a porous material, and an apparatus used therefor. .

[Means for solving problems]

In order to achieve the above object, the present invention provides a method for impregnating a porous material with a chemical solution, the method comprising: loading the porous material into a treatment tank with an openable lid; a loading step of sealing the treatment tank and reducing the pressure inside the treatment tank; and supplying a chemical solution into the depressurized tank and sprinkling the chemical solution from above the porous material toward the porous material. The first gist is a vacuum pressure impregnation method for a chemical solution, which comprises a chemical solution watering step and a pressurizing step of pressurizing the inside of the tank after the chemical solution watering. a chemical circulation means for circulating the chemical; a water sprinkling means provided above the treatment tank for sprinkling the circulating chemical toward the porous material; and a depressurization means for reducing the pressure inside the treatment tank; The second aspect is a vacuum pressure impregnation device for a chemical solution, which includes a pressurizing means for pressurizing the inside of a processing tank.

[Effect]

That is, according to the present invention, the impregnation treatment is performed by sprinkling the chemical solution from above the porous material instead of immersing the entire porous material in the chemical solution. , it is possible to perform impregnation treatment with the minimum amount of chemical solution required, resulting in significant cost reductions.

Next, the present invention will be explained in detail based on examples.

〔Example〕

FIG. 1 shows an embodiment of the impregnation treatment apparatus of the present invention. In the figure, reference numeral 20 is a horizontal cylindrical processing tank, and the inner tank 2
1 is loaded. Reference numeral 22 denotes inner tank mounting guides provided at predetermined intervals. Further, 23 is a water spraying means for spraying an impregnating chemical solution from above the loaded inner tank 21 toward the porous material, and as shown in FIG. 23a, and a header pipe 23b for uniformly supplying the chemical liquid 25 into the tray 23a. Reference numeral 24 denotes a chemical liquid storage tank for introducing a chemical liquid into the processing tank 20, in which a predetermined amount of chemical liquid 25 is stored in advance. The chemical solution 25 in the chemical solution storage tank 24 is introduced into the processing tank 20 via the flow path 30 using the differential pressure, is supplied to the header pipe 23b by the circulation pump 29, and overflows from the pores of the tray 23b. The water is sprayed downward in a uniformly dispersed state. Note that the surplus of the chemical solution 25 sprinkled from the tray 23a flows down to the lower part of the processing tank 20, passes through the recovery path 31, and is repeatedly sprayed from the tray 23a.

On the other hand, a pressure regulating passage 32 is connected to the upper part of the processing tank 20 via a pressure reducing valve 35. Cooling trap 36 and vacuum pump 3
A pressure reduction path 38 provided with a pressure reduction path 7 is connected to a pressure reduction path 41 that is opened and closed by a pressure valve 39 and communicated with compressed air supply means (not shown) such as a compressor. The pressure adjustment path 32 also includes a pressure gauge 42. Safety valve 43. Pressure switch 44, gauge gate valve 45. '$i pressure gauge 46. A pressure reducing switch 47 is provided.

Note that, as the inner tank 21 loaded into the processing tank 20, a frame body is used to restrain the contents so that the contents do not fall apart, as shown in FIG. 3, for example. This inner tank 21 is filled with a predetermined porous material 50, such as a square lumber, and loaded into the processing tank 20. It should be noted that since the hollow of the square timber extends vertically inside the timber, it is preferable to stand it vertically and fill it into the inner tank 21.

Using the above apparatus, for example, the porous material 5 is prepared as follows.
0 impregnation treatment can be performed. That is, first, a predetermined amount of the chemical liquid 25 is supplied into the chemical liquid storage tank 24 . Next, the inner tank 21 filled with the porous material 50 is loaded into the processing tank 20, and the lid is closed to seal it. And the pressure adjustment path 32
After operating the vacuum pump 37 connected to the vacuum pump 37 and opening the pressure reducing valve 35 to create a vacuum in the processing tank 20 of about 10 to 100 Torr and maintaining it for a predetermined period of time, the pressure reducing valve 35 is closed to stop the vacuum pump 37 and the opening/closing valve 26 is opened and the chemical solution 25 is introduced into the processing tank 20 from the chemical solution storage tank 24 . After the introduction, the on-off valve 26 is closed, the circulation pump 29 is operated, the chemical solution 25 is sent to the header vibe 23b via the recovery path 31 and the flow path 30, and the chemical solution 25 is sent from the tray 23a to the inner tank 23.
Sprinkle water towards 1. As a result, the chemical solution 25 is almost evenly spread over the surface of the porous material 50 in the inner tank 21.

A part of the water is impregnated into the porous material 50, and the rest flows down from the bottom, passes through the recovery path 31° and the flow path 30, and is sprayed with water from the tray 23a. By repeating this for a predetermined period of time, the chemical solution 25 gradually permeates into the porous material 50. In this state, the pressure valve 39 connected to the pressure adjustment path 32 is opened and compressed air is supplied into the processing tank 20 to pressurize the inside of the tank 20 to a predetermined pressure. Due to this pressurization, the chemical solution 25 adhering to and remaining on the surface of the porous material 50 is forcibly penetrated into the voids, and the surplus flows downward. Next, the release valve 34 provided in the pressure adjustment path 32 is opened to return the inside of the treatment tank 20 to normal pressure, and then the opening/closing lid is opened and the inner tank 21 is taken out, and the porous material 50 subjected to the impregnation treatment is can be obtained.

As described above, according to the above-mentioned apparatus, the minimum necessary amount of the chemical solution 25 set in advance is repeatedly sprayed and impregnated into the porous fLy+ (material 50) in the inner tank 20, which is different from the conventional method. Compared to this, the amount of chemical liquid used can be significantly reduced.Therefore, the cost of the chemical liquid 25 can be significantly reduced.

In addition, examples of the porous material 50 include porous materials that have shape-retaining properties themselves, such as wood, cardboard, casting, roof tiles, bricks, and bamboo materials. The shape of the inner tank 21 and the method of engagement between the inner tank 21 and the processing tank 20 are not limited to those in the above embodiments, but can be appropriately designed in accordance with the shape of the porous material 50 and the like. Alternatively, if the porous material 50 is a log, a large casting, or the like, there is no particular need to use the inner tank 21, and the porous material 50 may be loaded into the processing tank 20 in an exposed state.

Further, the chemical solution 25 for the impregnation treatment may be any chemical as long as it is used in conventional impregnation treatment, and is not particularly limited. For example, when the purpose is to dye wood, it is impregnated with a predetermined dyeing solution. Furthermore, when the purpose is to strengthen wood or cardboard, prepolymers such as acrylic resin or unsaturated polyester resin are used.

Furthermore, the water sprinkling means 23 for the chemical liquid 25 is not limited to the combination of the header pipe 23b and the top-open tray 23a, and any suitable showering means may be used. For example, as shown in FIG. 4, water may be sprinkled using a hollow header portion 23d with holes formed in the bottom surface 23c.

In addition, in the above embodiment, by regulating the amount of chemical solution to be circulated and the circulation time, it is possible to impregnate the target object with the chemical solution to a predetermined depth. It also has the advantage of being able to control the thickness of the impregnated layer.

〔Effect of the invention〕

As described above, according to the present invention, since the impregnation treatment is performed by repeatedly spraying water onto the porous material from above, the impregnation treatment can be efficiently performed using the minimum necessary amount of chemical solution. Therefore, the cost of the chemical solution can be kept low, and a relatively inexpensive impregnated product can be provided.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an embodiment of the present invention, Fig. 2 is a sectional view of the main part thereof, Fig. 3 is a sectional view showing the state in which the inner tank is filled with porous material, and Fig. 4 is FIG. 5, a perspective view of a main part of another embodiment, shows a conventional impregnation treatment apparatus. 20... Processing tank 21... Inner tank 23... Watering means 23a... Tray 23b... Header pipe
24...Medical solution storage tank 25...Medical solution 29...Circulation pump 30...Circulation path 31...Recovery path 35...
・Pressure reducing valve 37...Vacuum pump 39...Pressurizing valve Patent applicant Hisaka Seisakusho Co., Ltd. Agent Patent attorney Yukihiko Nishifuji fJ2 figure f43 figure

Claims (2)

[Claims] (1) A method of impregnating a porous material with a chemical solution, which includes a loading step of loading the porous material into a processing tank with an openable lid, and a depressurization step of sealing the processing tank and reducing the pressure inside the processing tank. A chemical watering step of supplying a chemical into the depressurized tank and spraying the chemical toward the porous material from above the porous material, and a pressurizing step of pressurizing the inside of the tank after watering the chemical. Features: Vacuum pressure impregnation method for chemical liquids. (2) A treatment tank with an openable lid into which porous material is loaded, a chemical storage tank, a chemical circulation means for circulating the chemical, and a chemical circulation means provided above the treatment tank to direct the circulating chemical to the porous material. A vacuum pressurization impregnation device for a chemical liquid, characterized in that it comprises a water sprinkling means for sprinkling water, a depressurizing means for reducing the pressure inside the processing tank, and a pressurizing means for pressurizing the inside of the processing tank.