JPS5942060A - Method and device for producing coated film - Google Patents

Abstract

PURPOSE:To provide a device which applies a coated film free from blushing and dewing in the stage of forming the coated film of an org. solvent coating compsn. or the like by providing a means for shielding wind around the coated film after dip coating and a means for diluting an evaporating solvent around the coated film right after the coating. CONSTITUTION:A substrate 1 which is, for example, an Al cylinder having a closed upper part and an open lower part, is dipped in a non-setting type coating compsn. 2 such as an org. solvent coating compsn., a latex coating compsn. or the like in a dip coating vessel 3. The substrate 1 coated thereon with the coating compsn. 2 is pulled from the vessel 3, and is positioned in a cylindrical means 5 etc. for shielding wind constituted of a cylindrical cover etc. and is provided with a port 6 for diluting the concn. increased by evaporation of the solvent in the bottom part. As a result, the solvent vapor which is heavier generally than air is mae to escape through the port 6 to accelerate the drying of the coated film. It is also possible to provide to part not only in the lower part of the means 5 but in the upper part as well.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a process immediately after forming HHi on a coated film by a dip coating method or the like.

In general, latex-based coating compositions such as paints using organic solvents (residual solvent-based coating compositions or aqueous polymer emulsified dispersions) are coated with a cooling medium applied to the object to be coated. It also has the property of not gelling.

These coating compositions include electrophotographic compositions containing photosensitive components such as zinc oxide, cadmium sulfide, and diazo compounds; electrophotographic compositions containing organic photoconductive polymers such as polyvinylcarbazole and polyvinyl anthracene; A photosensitive composition containing an organic halogen compound, a diazo compound, etc. as a photosensitive component, a pressure-sensitive paper containing microcapsules or protective particles), a composition for coatings, a composition for a magnetic tape, etc. Are known.

Such a coating composition is heated after being applied to the object to be coated. A method of drying with I+ has been carried out, but rapidly sending heated air immediately after coating is required to satisfy conditions such as film thickness uniformity, Table I67 flatness), and H properties. However, the state of the coating film immediately after coating is extremely unstable, as the coating solution does not evaporate and remains in the coating film in small amounts. It becomes. For this reason, if the coating film was directly introduced into the air immediately after application, the organic solvent in the coating film would rapidly evaporate, causing whitening and dew condensation on the coating film, which was undesirable. Conventionally, as a method to solve such drawbacks, as described in JP-A No. 50-75041, the object to be coated is thoroughly probed using a coating container, and the coating is dried to %% immediately after coating. A method is known in which this is carried out in a sufficiently high solvent atmosphere, that is, by making the evaporation rate of the 7'3 medium sufficiently close.

However, this method has a disadvantage in that it requires a slow pulling speed compared to the dip coating method, and is not suitable for high-speed mass production of photoreceptors.

The object of the present invention is to form a coating film of an organic solvent-based coating composition or a latex-based coating composition without causing any whitening or caking phenomena, and to coat it with ≦oil. An object of the present invention is to provide a method for manufacturing a coating film and its installation.

Another object of the present invention is to provide a method and apparatus for producing a coating film having a uniform thickness using an organic solvent-based coating composition or a latex-based coating composition.

In order to speed up the drying of the film, it is possible to blow the solvent X + 3 air with dill, but the method of applying air causes the above-mentioned defects. Therefore, the present invention is devised to speed up the drying process by preventing the paint film from being exposed to direct wind. That is, by providing a wind shielding means around the basin film so that the wind does not hit the coating film after dipping (& coating), and by providing an evaporative solvent dilution means around the m-antinopan immediately after coating,
The aforementioned objectives are achieved.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a sectional view of an apparatus used in the manufacturing method of the present invention.

In FIG. 1, the object 1 to be coated may be a cylindrical substrate such as an aluminum O-cylinder with a closed top and an open bottom.

2 is a non-set coating composition such as an organic solvent-based coating composition or a latex-based coating composition; 3 is a dip coating container; 4 is a coating container lid; and near the center is an opening 1 into which the object to be coated can be inserted.
-1 copy/dos have -C. 5 is a plastic film,
It is a wind shielding means formed by a cylindrical cover made of stainless steel, aluminum, etc. An opening is provided near the bottom of this wind shielding means to dilute the concentration of the evaporated solvent.
It is provided. The opening 6 can function as an evaporative solvent diluting means, but the evaporative solvent diluting means 6 shown in FIGS. 2(, L) and (b) can also be used. FIG. 2 (&) shows a configuration in which legs 7 are provided at the bottom of the wind shielding means 5. When this is placed on the coating container lid 4 shown in FIG.
An opening may be formed therebetween, and such opening may be used as an evaporative solvent dilution means.

When this happens, it can function as an evaporative solvent dilution means.

In general, the solvent vapor is heavier than air or the drying process is further prevented in the wind shielding means, so that it can work more effectively. The method of the present invention is particularly preferable in the case of a dip coating method, but it can also be applied in the case of a knife coating method, a roll coating method, a calendar coating method, an extrusion coating method, a gravure coating method, etc. coating method,
It can also be used in spray coating methods.

The film may be heated to the extent that it does not adversely affect the film.

The coating film produced in this way is then rapidly dried and solidified, but even though the coating film is pulled out of the coating container at high speed, it is difficult to form a uniform film thickness. Moreover, phenomena such as whitening and dew condensation do not occur.

In addition, according to the method of the present invention, by providing a cover having U11 holes around the object to be coated, the drying of the coating film can be carried out smoothly and a coated surface with a clean finish can be obtained. Became.

Next, embodiments of the present invention will be described, but it goes without saying that the coating method of the present invention is not limited to ItC.

Example 1 A cylindrical aluminum substrate measuring 8 o φ x 300 mm with a closed upper end and an open lower end was used as a coated fabric, and a polyamide resin layer was provided on this by the method described below.

Copolymerized nylon (product name: Ami 2) as polyamide resin
4 parts of this (same except for the lower part by weight) were dissolved in 60 parts of methanol and 66 parts of toluene. The container was made of stainless steel (16oφ x 4ooIII+1 mm), covered with a lid with a 90φ hole, and coated in the manner shown in FIG. 1.

First, when the substrate was pulled up at a speed of 100 n/min without the cover attached, a phenomenon was observed where the methanol suddenly dried and condensation formed on the surface when the substrate rose from the lid, causing the coating film to deteriorate. It turned white.

Therefore, we processed the polyester film to 100φX
When I made a 200mm cover and attached it to the top of the lid and applied the coating, the rapid evaporation of methanol was suppressed and a clean coating was obtained, but the pulling speed was changed to 20On+u.
When the substrate was raised to +/min and pulled up, the paint film was still cracked when the substrate was lifted from the cover, and it was found that the paint film was drying in spots due to natural wind.

As a wind shielding means, 8 holes 6 of 10φ as shown in Fig. 6 are installed.
When the coating was applied by pulling up the C substrate at a rate of 200 tnm/minute using the proprietary cover, the solvent vapor quickly dried through the holes, resulting in a clean coating.

A good coating film was obtained by providing the U groove having an opening [j in this manner.

[Brief explanation of drawings]

Figure 1 is a sectional view of the apparatus used in the method of the present invention, Figure 2 (
B), $4≠(b), and FIG. 6 is an exploded view of the wind shielding means used in the method of the present invention. 1...see object to be coated 2-...-Ifls
, Fabric composition 6... Soaked? &! /Application container 4・
...In the coating container ψ5...Wind shielding means 6
...hole 7 ...foot 8
...444th Tokken Applicant Canon Co., Ltd. Agent Patent Attorney Masaru Marushima - 381 2nd Portion (Q) (b) 1st Participant

Claims (2)

[Claims] (1) A method for producing a coating film, which comprises applying a coating composition to an object to be coated, and then placing the coating film in a diluted evaporation solvent under a wind-shielded environment. (2) having a dip coating container and a wind shielding means provided thereon;
An apparatus for producing a coating film, characterized in that the wind blocking means is equipped with an evaporative solvent diluting means.