JPS594472A - Method and tool for coating - Google Patents

Abstract

PURPOSE:To execute effectively a coating treatment in a waterproofing treatment on a wet surface or flowing water surface, by blowing off the water on the coating surface by air and performing spray coating on the coating surface while expelling the flowing down water by air flow. CONSTITUTION:A coating tool is provided with a spary nozzle 1 for a coating material and an air nozzle 2, and nozzle 1 has the forward end part projected more to the coating surface 3 side than the forward end of the nozzle 2. The forward end of the nozzle 1 is located in the air flow 4 formed by the nozzle 2. In use, the coating material supplied through a force feed pipe 11 for the coating material is atomized by the nozzle 1 to form the flow 5 of the coating material which forms a painted film 6 on the surface 3. On the other hand, the air fed forcibly through a force feed pipe 21 for air is discharged from the nozzle 2 to form the air flow 4 enclosing the flow 5, thereby blowing off the water stuck on the surface 3 and blocking the entry of the flowing down water to the film 6. The progression of the filming is thus assisted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for efficiently applying coating compositions such as paints, adhesives, waterproof film forming materials, etc. The present invention relates to a method for coating and an applicator therefor.

Some kind of waterproofing treatment is often required on the walls of structures such as mountain tunnels, urban tunnels, underground malls, and public ditches, or intermediate structures therebetween. The waterproofing treatment is carried out, for example, by applying a sealant to the wall surface and then attaching a waterproof sheet, or by applying a waterproof film-forming material to the wall surface. However, the Wl fabrication process for such adhesives or waterproof coating materials is usually very difficult. This is because the above-mentioned structures are located underground, so they are usually humid, and their walls are often damp with moisture or have condensation, and what's more, groundwater that springs up can leak onto the walls. This is because it is rare for it to even flow down the river. Even if an adhesive for waterproofing or a waterproof film-forming phase is applied to such a wet or flowing surface, it may be washed away and cannot be applied, or even if it can be applied, the film may blister. I can't get enough floors.

Therefore, in order to perform waterproofing treatment on such flowing water surfaces or wet surfaces by coating, it is necessary to apply V in advance to the spring water part of the wall surface.
After making cuts and filling them with a water-stopping agent to make them waterproof, the wet surfaces are dried using a torch lamp, etc., and then waterproofing is done. In other words, extensive preliminary work was required before waterproofing.

The present invention relates to the above-mentioned wet surface tanning running water surface. The purpose of the present invention is to provide a coating method and an applicator for performing a coating process, such as waterproofing, without requiring any essential preliminary treatment. It is something.

According to the research of the present inventors, when applying to a wet surface or a flowing water surface as described above, the moisture on the coated surface is blown away by air, and the water below the coated surface is removed by air flow. It has been found that this can be carried out efficiently by applying tsuriuta cultivation.

The coating method of the present invention is based on the above-mentioned findings, and
More specifically, when spraying a liquid coating composition,
The method is characterized in that the application is carried out while blowing air around the part of the application surface where the i-cloth composition is currently being sprayed.

Furthermore, the applicator of the present invention was developed to efficiently carry out the above-mentioned coating method of the present invention, and includes a spray nozzle for a liquid coating composition and a spraying of the liquid coating composition from the nozzle. The present invention is characterized in that it includes an air nozzle 1116 arranged so as to be able to form an air flow surrounding the flow of rice grains.

The present invention will be explained in more detail below.

The coating composition used in the coating method of the present invention includes general paints in addition to the above-mentioned adhesives for waterproofing and waterproof coating film forming materials. The method of the present invention can be effectively implemented, for example, on damp exterior walls of general buildings during or after rain.

Coating composition (hereinafter simply referred to as "paint") used in the method of the present invention
If the surface to be coated is a wet surface where moisture or water droplets are temporarily stained, such as with dew condensation, permanent coatings, whether organic solvent-based or water-based, should be used. used. However, considering that some moisture may remain on the coated surface, it is preferable to use a polar organic solvent such as alcohol even when using organic solvent-based wood, and it is better to use a water-based coating material. Yes, a coating film with high surface strength can be obtained. Examples of such water-based paints include water-based emulsion paints and water-soluble resin solutions, including synthetic resin emulsions, natural and synthetic rubber latexes, asphalt emulsions, and the like. Further, the use of these water-based coating materials is particularly preferable from the viewpoint of environmental hygiene when working in closed spaces such as the aforementioned various tunnels, underground/downtown areas, or spaces where good ventilation cannot be expected.

Underground tunnels, etc. in each of the buildings mentioned above: For coated surfaces where water runs down, such as walls of structures or exterior walls of buildings during rain, use a coating material 7 that can quickly form a scaly film. is preferred. This is because paints that form a slow film may be washed away by the water that flows down again when the application process is stopped, that is, the air spraying on the coated surface is stopped, making it difficult to form a homogeneous continuous film. This is because.

Preferred examples of such a coating film 44 that can be quickly formed include a coating film-forming main agent consisting of an aqueous emulsion including the aforementioned synthetic resin emulsion, synthetic or natural rubber latex, and asphalt emulsion; Combinations with coagulating or gelling agents that destroy the dispersion stability of these aqueous emulsions and promote coagulation of emulsion particles are included. The principle used for promoting coagulation by destroying emulsions is based on the colloid table IM.
Neutralization of potential, pH neutralization, and stabilization by anionic surfactants The cationic surfactants in emulsions are stabilized by mixing with emulsions stabilized by these, resulting in stability breakdown, salting out, and acid precipitation. As a technique for providing a coating material that forms a film quickly using such a principle, there is a technology disclosed in Tokuko Sho≠≠-, No. 2,279', tJ-29.
! No. 3, same! 17-. 20ItJ issue, JP-A-Sho≠7-3
≠jt No. 37, same j! -/4'ri No. 31.3, same, t
4-3♂t3ri issue, same j&-jt3/lgu issue, same j7-
jri r77, same 77-/! No. 17, 37-/11
No. 77, same! 17-1.337/No. 17-1.337/ are known. Any of these techniques can be used in the present invention. More specifically, as a coagulant that acts as a film-forming promoter for a film-forming main agent consisting of an aqueous emulsion coating material as described above, a cationic surfactant for an anionic emulsion or a cationic emulsion, - 1) Anionic surfactant for f-ionic emulsions or anionic emulsions; primary ammo-1 such as lauryltrimethylammonium chloride, stearyltrimethylammonium chloride, distearyldimethylammonium chloride, alkylbenzyldimethylammonium chloride F, etc.
Inorganic salts such as calcium chloride, alum, clay sulfate, sodium silicate, potassium silicate, ammonium sulfate, and ammonium chloride are used.

When applying a paint consisting of a combination of the emulsion and coagulant described above, gelation occurs instantaneously due to the combination of the two, so the emulsion and coagulant should be sprayed separately and then mixed in an atomized state. It is preferable to apply the coating to the coating surface at the same time. When used as a two-component coating material in this way, the ratio of the two depends on the respective 441f and concentration, but
In general, if the coagulant is an inorganic salt or the like, 0.2 to IO parts by weight per 100 M parts of the solid content of the emulsion, and if the coagulant is an oppositely charged emulsion, SO to 20 parts by weight.
A range of 0 parts by weight (solid content) is appropriate.

According to the present invention, when spraying the coating material described above, the paint blower on the coated surface blows air around the area. The coating material can be sprayed using a conventionally known air spray gun, airless spray gun, or the like. On this occasion,
For blowing air, use a separately prepared air nozzle of / or - or more.
By keeping the spray gun at an appropriate relative position to the paint spray gun, the paint can be sprayed around the area to which the coating material is being sprayed in such a way as to blow away moisture adhering to the coating surface and to block moisture from approaching the area to which the coating material is being sprayed. However, in order to easily implement the coating method of the present invention, it is more preferable to use an applicator in which the relative positions of the coating material spray nozzle and the air nozzle are fixed at an ideal position. Both coatings of the invention are used.

): Figure α1 is a conceptual layout diagram of the nozzle tip in the usage state of the most basic embodiment of the applicator of the present invention, and this applicator is suitable for coating material I! It has one mist nozzle l and one air nozzle, and the tip of the paint jetting nozzle protrudes toward the coating surface 3 side compared to the tip of the air nozzle, and the paint is sprayed into the air flow μ formed by the nitrogen nozzle. The tip of the material spray nozzle is positioned.

When using the above applicator, the coating material supplied through the coating 44 pressure pipe // is atomized by the nozzle / to form a coating material jet flow j, which forms a coating film t on the coating surface 3. do. On the other hand, the air pumped through the air pressure pipe, 2/ is sent to the nozzle! A stream of nitrogen gas is discharged and surrounds the coating material stream J, which blows away the additional water on the coated surface 3 and improves the adhesion of the mineral to the cloth surface. This prevents flowing water from entering the coating film t formed at the same time, thereby aiding the progress of film formation.

The application process of the present invention is preferably carried out in a manner corresponding to FIG. 1, as shown in FIG. That is, in the example shown in FIG. 2, the paint spray nozzles in the example shown in FIG.
2 and a film-forming accelerator spray nozzle located in the center/
It is divided into b. In addition, the air nozzles are a pair of nozzles 28 arranged at points symmetrical positions with nozzle /b as the center.
It is divided into ゜, 2b.

When using the head cloth shown in FIG. 2, the film-forming main agent (preferably the aforementioned water-based emulsion paint) that is pumped through the film-forming main agent pressure-feeding pipe //a is transferred to the nozzle /a1.
．． The film-forming accelerator (preferably the above-mentioned emulsion coagulant) sprayed by /a2 and forcedly fed by pipe //b is atomized by nozzle lb, and both are mixed to form a coating material spray stream. ! is sprayed onto the fabric surface 3 in a state that allows rapid coating film formation due to gelation etc.
form.

On the other hand, the Nozzle pumped by Hibuco/Nozzleco a,
, 2b is discharged, and the desired airflow ta expands and spreads to the coating surface 3.
Removes adhering water on the surface and prevents sewage from entering the coating.

The nozzle arrangement in this example is lll-111 in Figure 1.
As shown in Figure 3 as a layout diagram taken from the surface, 2b
It is also possible to make the columns orthogonal. Nitrogen flow a, ≠ b and coating material near the coating surface 3 in both examples] Tribute flow j
The expansion is shown in Fig. 3 and V by imaginary lines and dotted lines, respectively.
The coating shown in Fig.b and λ, which is also shown in the figure, is different from that shown in Fig. 1 because the tips of the air nozzles 2a and jb are coated. , /a2
By installing it on the same surface as /b etc. or in a position very close to the application surface 3, the effect of removing layered water and the removal of water on the application surface 3 can be improved. And coating material 1
The influence of the air flow on the spray mist flow j can be reduced compared to that shown in FIG. 1, and the application operation becomes easier. In addition, the applicator in this example can use two-component paint and can quickly form a coating film, so it can also be applied to the surface of running water! Having one point is the same as mentioned above.

Note that the number of air nozzles can be three or more, and in this case, as shown in FIG.
In particular, it is preferable to provide air nozzles as shown in 2c, 2d, and je at approximately symmetrical positions on the virtual circle 7 centered at /b). Although not particularly shown, even when using a single air nozzle as shown in Figure 1, it is possible to use two or more coating material spray nozzles to create an applicator that can use a two-component coating material. Of course it is possible.

There is no particular limitation on the shape of the air outlet of the air nozzle 2, -2a Hja +..., and a straight pipe or a straight pipe modified to have a flat or rectangular cross section may also be suitably used.

In addition, the air pressure and air flow rate when carrying out the coating method of the present invention using the above-mentioned applicator should be appropriately determined according to the type of nozzle used within a range that provides the desired effect of removing attached water and preventing intrusion of flowing water. Bye.

As described above, according to the present invention, when applying a coating material to a wet or running water surface, air is simultaneously blown around the application area to remove adhering water and prevent the intrusion of running water. By preventing this, a coating method and a coating for that purpose are provided that can easily form a healthy coating film without complicated pretreatment. In addition, by using an aqueous two-component coating material consisting of a combination of an aqueous emulsion and a setting accelerator, it can be applied to the walls of underground structures such as various tunnels and underground malls for waterproofing. It becomes possible to easily and safely carry out the coating work, which has been extremely difficult in the past.

The present invention will be explained in more detail below using Examples and Comparative Examples.

Example A flexible board (JIS A-j1103) of approximately 10 x 10 an was propped up at an angle of approximately 7 to σ using a coating device having the nozzle arrangement shown in Figures 2 and 3. The coating was carried out on the coating surface on which water was allowed to flow down at a flow rate of 320 and 16≠Occ/min over a distance of approximately j to 7 cm rl at the center thereof.

As a coating material, acrylic t* 2-functional tylhexyl SOM
weight parts, butyl acrylate 50 parts by weight, emulsifier (sodium lauryl sulfate) 1 part by weight, potassium persulfate 0 μ weight part,
A two-component composition consisting of a combination of an acrylic resin emulsion produced by polymerizing 0.1 parts by weight of trisodium phosphate and 10 parts by weight of water at 70°C for ≠ hours and a gelling agent (aqueous CaCl solution). Use this as a nozzle/a□
, /a2 in a weight ratio of approximately 2:/ in total 11
Mixed (fogged) at a flow rate of 7 minutes.

The air nozzles a, , 2b of the applicator are used by deforming the tip of a copper tube whose inner diameter is ≠ dragon, and transforming it into a rectangular cross section with /, ≠ 朋
Air was blown onto the coated surface at an air pressure of A+'-j vertical uG.

The applicator is nozzle-2a, /al, /b
, /a2+ and Jb are arranged approximately in series with a distance of about 2α, and the tips of the nozzles 2a and - protrude about 3 cm toward the coating surface side compared to the other nozzle tips. During coating, these nozzle rows are held approximately horizontally, and the coating material nozzles /a1. C2. /b to coating surface 3
The distance to the applicator and the moving speed of the applicator were changed for each test, and the applicator was moved horizontally while holding the applicator, and the width was approx./3-
:), 0m% thickness about 1! Oμm (as dry coating thickness)
A coating film was formed.

The results of the coating test were as shown in the table below.

Table 7 Measurements were made of the upper half of the approximately vertically elongated structure shown in Figures 3 and 3 on the coated surface that can be blown away when air is blown onto the coated surface. is the diameter of the horizontal part, and ( is the vertical radius above the horizontal part.

In addition, the symbol "i" in the "Appearance" section means the following conditions.

○: There is no evidence that the paint film has flowed, and it is good. ■: The paint film has some flowing parts, but it forms a continuous paint film, and there is almost no problem with the appearance. Δ: The drainage effect is good. is insufficient, and a flow state remains on the paint film. The appearance of the paint film deteriorates slightly.

Further, on the flexible board with different flow patterns of flowing water, tests were conducted on the drainage effect using the applicator and varying the air pressure and the distance to the application surface. The results were as shown in Table-C.

Comparative Example A test similar to that of the above example was conducted using the applicator of the above example, but without exhaled air.

At this time, the running water is at two levels: 3.20 and /1≠Occ/min, and the distance to the coating surface is ), QCm,
The lateral movement speed of the applicator was tsm/min.

As a result, in any case of current flow, film formation of the emulsion coating film in the area where the water was flowing did not progress sufficiently and easily ran off, making it impossible to form a coating film.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1 and 2 are 'conceptual layout diagrams of the distal end of an applicator according to an embodiment of the present invention in a state of use,'respectively;
Figures 3 and μ show the nozzle arrangement and coating fJ near the coating surface when viewed from a plane almost parallel to the coating surface.
FIG. 5 is a diagram showing a state in which the air flow and the air flow are expanded. FIG. 5 is another nozzle arrangement diagram viewed from a plane parallel to the missing cloth surface. C... Coating 4J nozzle (/a, /a2... Nozzle for spinning the main agent for coating film formation, /b... Nozzle for spraying film-forming accelerator), 2 +' 2 a, λb... air nozzle,
3... Application surface, g, g a, μb... air flow, !
...Nuri Io + t (4th flow, t...Anointing film. Applicant's agent Kiyoshi Moromata Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Prisoner C

Claims (1)

[Scope of Claims] l. A coating method characterized in that the liquid coating composition is applied while blowing air around the portion of the coating surface where the coating composition is actually applied. . The method of item 1 above, wherein the two-component coating composition is an aqueous two-component composition comprising a combination of an aqueous emulsion including a synthetic resin emulsion, a natural and synthetic rubber latex, and an asphalt emulsion, and a coagulant for the emulsion. . 3. An applicator comprising: a spray nozzle for a liquid coating composition; and an airflow nozzle arranged so as to be able to form an air flow surrounding the spray IPJt& of the liquid coating composition from the nozzle. The liquid coating composition utakatsu nozzle tip is made to protrude toward the surface of the violet cloth compared to the tip of the air nozzle, and the tip of the spray nozzle is positioned in a rush of air formed by a single air nozzle. Top applicator. 3. The applicator according to item 3 above, which has two or more air nozzles arranged at substantially symmetrical positions in a virtual circle with the center of the nozzle tip for spraying the liquid coating composition. t. The jet edge nozzle for the liquid coating composition is composed of a nozzle for spraying a film-forming agent and a nozzle for spraying a film-forming accelerator. Applicator for any of the above.