JPH0660262B2 - Method for treating porous body and apparatus for treating porous body - Google Patents

Description

The present invention relates to a method for treating a porous body having continuous pores such as filter paper, non-woven fabric, knitted fabric, sintered body and foam.
The porous body is mainly used as a filter.

[Conventional problem]

Porous bodies having continuous pores such as filter paper, non-woven fabric, knitted fabric, sintered body, and foamed body are mainly used as filters. The pore diameter of the continuous pores of the porous body is generally 5 μm or more. In industry and the like, there is a growing need to carry out finer filtration, and a porous body having continuous pores with a fine pore size of 1 μm or less, further 0.1 μm or less is required. However, it is extremely difficult to reduce the pore size of the continuous pores of these porous bodies. For example, in the case of fibrous materials such as filter paper, non-woven fabric, knitted fabric, etc., the diameter of the fiber to be used can be made small, but there is a limit to making the diameter of the fiber small. Can be reduced, but there is also a limit to reducing the particle size. Further, in the foam, it is extremely difficult to control the diameter of the continuous pores. Therefore, in the fine filtration, the present situation is to use a porous body having fine continuous pores made of special fibrin derivative or plastic which is unavoidably expensive.

[Means for Solving the Problems]

The present invention, as a means for solving the above conventional problems,
The porous body (1) having continuous pores (2) is mixed with mist droplets (3) of a liquid polymer precursor to force gas to pass therethrough, and the porous body
The polymer precursor is applied by spreading the fog droplets (3) on the wall surface (2) A of the continuous pores (2) A of (1) by the pressure of the gas, and then polymerized to give a polymer. By providing a method for treating a porous body (1), which reduces the pore size of the continuous pores (2) and makes the pores uniform.
A processing chamber in which (1) is installed, a blowing means (12) communicating with the processing chamber, and atomization of a polymer precursor inserted on the blowing means (12) communication side of the porous body (1) A treatment device for a porous body (1) comprising means (13) is provided.

The porous body (1) having continuous pores (2) used in the present invention is, as described above, a filter paper, a non-woven fabric, a fiber material such as a knitted fabric, a particle solidified body such as a sintered body, an inorganic or organic material. It is a foam.

The polymer precursor used in the present invention is methyl methacrylate, ethyl methacrylate, methyl acrylate,
Monomers such as ethyl acrylate, acrylic acid salts, methacrylamide, acrylamide, styrene, acrylonitrile, vinyl chloride, vinylidene chloride, vinyl acetate and other vinyl monomers and methylolmelamine, methylated methylolurea and other aminoplast monomers. And prepolymers such as oligomers of the above monomers, phenol prepolymers, epoxy prepolymers, and urethane prepolymers.

The above-mentioned polymer precursor is a liquid one as it is, or a solvent such as toluene, xylol, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone, methanol, ethanol, trichloroethylene, n-hexane, water, etc., alone or in combination of two or more kinds. It is used as a solution dissolved in a mixed solvent. The above examples are not meant to limit the invention and a wide range of polymer precursors and solvents are used in the invention.

Furthermore, a polymerization initiator, a curing agent, a sensitizer, etc. may be added to the above-mentioned polymer precursor, and a plasticizer, a dye, or a treating agent such as a deodorant, a reducing agent or an oxidizing agent may be mixed depending on the purpose. .

In the present invention, air, nitrogen, preferably an inert gas such as argon is passed through the porous body (1) having continuous pores (2), and the gas (spray (13) or the like of the polymer precursor is sprayed to the gas (13). Mix 3).

In this way, the wall surface (2) A of the continuous pores (2) of the porous body (1)
A polymer precursor is applied to the polymer precursor, and the polymer precursor is made into a polymer by a polymerizing means such as heating, light irradiation, and water contact.

[Action]

The operation of the present invention will be described with reference to FIGS. In the figure, (1) is a porous body and (2) is continuous pores of the porous body (1). Gas is forced to pass through the porous body (1) in the direction of the arrow as shown in FIG. When the polymer precursor mist droplets (3) are mixed with the gas, the mist droplets (3) form continuous pores of the porous body (1).
Although it adheres to the inlet of (2), it is pushed by the gas transmission pressure and spreads into the continuous pores (2) as shown in FIG.
A liquid film is formed on the wall surface (2) A (for example, in the case of a filter paper, the peripheral wall surface of the pulp fibers constituting the filter paper). After that, when the liquid film of the polymer precursor is polymerized by the polymerizing means to form a polymer, the wall surface (2) A of the continuous pores (2) of the porous body (1) is a polymer layer as shown in FIG. The diameter of the continuous pores (2) of the porous body (1) is reduced by being covered with (5), and the thickness of the polymer layer (5) is the mixing amount of the mist droplets (3) with respect to the gas or the mist droplets.
Since the amount of gas mixed with (3) can be adjusted, the diameter of the continuous pores (2) can be reduced to a desired diameter. And the pore diameter of the continuous pores (2) of the porous body (1) generally varies, but the large pore diameter of the continuous pores (2) has a small gas passage resistance, so the fog droplets (3) are preferentially mixed. As a result of the passage of gas, the continuous pores (2) with a large pore size are
(2) A liquid film is formed on A. Thus, the diameter of the continuous pores (2) is reduced and the variations are made uniform.

〔The invention's effect〕

Therefore, in the present invention, it is possible to extremely easily reduce the pore size of the continuous pores of the porous body to a predetermined diameter by the polymer layer and make it uniform, and it is possible to provide the porous body for microfiltration at a very low cost. . In addition, the porous body is reinforced by the polymer layer and improves chemical resistance and deodorizing action,
It can also provide a desalting action, an ion exchange action, and the like.

〔Example〕

The present invention will be described with reference to an embodiment shown in FIG.
Reference numeral 1) is a guide cylinder having a processing chamber formed therein, a blower (12) which is a blower is arranged at the root end of the guide cylinder (11), and a spray gun (atomizing means) is provided in the middle. 13) is inserted, and the clip (14) is attached to the tip,
The porous body (1) is supported by (14). Then, the blower (12) is operated to blow air through the porous body (1) as shown by the arrow, and the spray gun (13) mixes the mist droplets (3) of the polymer precursor into the air. In this way, fog droplets are formed on the porous body (1).
When the air mixed with (3) is passed through, the wall surface (2) A of the continuous pores (2) of the porous body (1) is processed by the process shown in FIGS. 1 to 3.
A polymer layer (5) is formed on the surface.

For example, the following is adopted as the porous body (1).

Filter Paper Polyester Nonwoven Fabric Alumina Sintered Body Polyurethane Foam Body As the polymer precursor, for example, the following ones are adopted.

(a) Urethane prepolymer 50 parts by weight Methyl ethyl ketone 50 〃 (b) Methylol melamine 25 parts by weight Curing agent 0.5 〃 Methanol 60 〃 Water 14.5 〃 (c) Ethyl methacrylate 80 parts by weight Ethyl acetate 20 〃 Azobisisobuty Ronitrile 0.3 〃 (d) Erislit tetramethacrylate 30 parts by weight Sensitizer 0.3 〃 Methyl ethyl ketone 70 〃 (e) Sodium acrylate 30 parts by weight Starch 10 parts by weight NN Methylenebisacrylamide 0.3 〃 Ammonium Perth Fate 0.3 〃 Water 60 〃 The above polymer precursor is added to the wall of the continuous pores (2) of the porous body (1)
(2) After applying to A, (a) is dried and then contacted with water,
(b) is heated at 70 ℃ for 20 minutes, (c) is a gas mixed with mist drops of aniline at room temperature, (d) is irradiated with ultraviolet rays after drying, (e) is at 80 ℃ for 10 minutes Each is polymerized by heating. The polymer layer (e) has a water absorbing property and is used as a water absorbing layer.

In the above embodiment, the porous body (1) also has an area of 1 m ² and a pore size of 6
When a filter paper having μ continuous pores (2) is used and the polymer precursor (a) is used, the pore size of the continuous pores of the filter paper is reduced by the treatment of the present invention as shown in the table below.

When a filter paper is used as the porous body (1) in the present invention, a supporter (21) as shown in FIG. 5 is usually used. The supporter (21) comprises a porous cylinder (22) and flanges (23) and (24) formed at both ends of the porous cylinder (22). The supporter (21) has a filter paper (1) folded and folded as shown in FIG.
Is supported, and a plug (25) is fitted to one end of the porous cylindrical body (22) of the supporter (21). Therefore, according to the treatment method of the present invention, as shown in FIG. 7, the filter paper (1) which is a porous body is supported.
It may be carried out while being supported by (21). That is, filter paper (1)
A plurality of supporters (21) supporting the above are housed in a chamber (31) having a processing chamber formed therein, and the open ends of the supporters (21) are connected to a communication port (33) of a support plate (32) of the chamber (31). ) And a suction path (34) communicating with the suction side of the blower pump (35) which is a blowing means, and a ventilation path connected to the bottom of the chamber (31) and communicating with the discharge side of the blower pump (35) (36) is connected to the side surface of the chamber (31), and a spray gun (37) of a polymer precursor, which is an atomizing means, is inserted in the air passage (36).

When the blower pump (35) is operated in the above structure, the air in the chamber (31) flows into the supporter (21) through the filter paper (1) supported by the supporter (21) and the suction path (34).
The air is sucked into the absorption side of the blower pump (35) through the air blower, is discharged from the blower side, and is blown into the chamber (31) through the blower path (36). In this way, air is passed through the filter paper (1) into the chamber (31), the suction path (34), the blower pump (35), and the blower path (36).
Spray the polymer precursor from the spray gun (37) of the air flow path (36) to spray the polymer precursor (3)
Is mixed with the air. Thus, after applying the polymer precursor to the wall surface (2) A of the continuous pores (2) of the filter paper (1) by the mechanism shown in FIGS. 1 to 3, the polymer layer is formed by a predetermined polymerizing means. To be done.

[Brief description of drawings]

1 to 3 are explanatory views of the polymer layer forming process,
FIG. 1 shows a state in which fog droplets are attached, FIG. 2 shows a state in which a liquid film is formed, FIG. 3 shows a state in which a polymer layer is formed, and FIG. 4 is an explanatory view of an embodiment of an apparatus used in the present invention, and FIG. FIG. 6 is a perspective view of a filter paper supporter, FIG. 6 is a perspective view of the supporter with a filter paper attached, and FIG. 7 is an explanatory view when the treatment of the present invention is performed on the supporter with a filter paper attached. In the figure, (1) ... porous body, (2) ... continuous pores, (2) A ... wall surface, (3) ... fog, (5) ... polymer layer (12), (35) ... … Blower means (blower) (13), (37) …… Atomizing means (spray gun)

Claims (2)

[Claims] 1. A gas in which mist droplets of a liquid polymer precursor are mixed is forced to pass through a porous body having continuous pores, and the mist droplets are caused to flow on the wall surface of the continuous pores of the porous body by the feeding pressure of the gas. A method for treating a porous body, which comprises applying the polymer precursor by spreading and then polymerizing the polymer to reduce the diameter of the continuous pores and make the pores uniform. 2. A processing chamber in which a porous body is installed, an air blowing unit that communicates with the processing chamber, and a polymer precursor atomizing unit that is inserted into the air blowing unit connecting side of the porous body. Of porous material