JPS62227476A - Application of anti-corrosive agent - Google Patents

Abstract

PURPOSE:To prevent the flowing-down of paint at the time of working, by mixing a foaming agent with an anti-corrosive agent sprayed along with compressed air. CONSTITUTION:An anti-corrosive agent A consisting of a solid component such as petroleum sulfonate, lanolin metal salt, oil or wax and a solvent component such as toluene or xylene and compounded with anti-corrosive pigment and a plasticizer etc. if necessary is mixed with a foaming agent such as propane, LPG or azobisisobutyronitrite to fill a tank or cylinder 1. At the time of painting, the resulting mixture is sprayed to the surface of an article to be painted simultaneously with compressed air or in a state mixed with compressed air immediately before painting. Whereupon, the foaming agent in the paint sprayed to the surface of the article to be painted is evaporated and a large number of air bubbles of the anti-corrosive agent are generated by the action of the surface tension of said foaming agent to be adhered to the surface of the article to be painted and, therefore, the dripping of the paint is suppressed by high holding force possessed by the air bubbles.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to anti-rust coatings that play a major role in the maintenance of vehicles and ships, and more specifically to anti-rust coatings for metal products that require anti-rust and anti-corrosion properties. The invention relates to a method of applying the agent.

(Conventional technology) Various methods have been known for applying rust preventive agents, but industrially, they have been widely used for the purpose of saving manpower, speeding up the painting process, and making the painting process easier to manage. Although it depends on the type of object to be painted, spray painting has been most widely used.

Generally, as shown in FIG. 3, the rust preventive agent At is placed in a tank 18 as it is, and a pressure of 30 to 100 kg/- is applied to spray the rust preventive agent At in an appropriate spray pattern. The so-called airless spray method sprays from the nozzle 6 of the spray gun 17, or the rust preventive agent in the paint tank 18 is mixed with pressurized air inside the mixer in the middle of the flow path or inside the spray gun ahead of it and sprayed. This was carried out either by a so-called air mix method or by an air spray method.

(Problems to be Solved by the Invention) However, in such conventional application methods, there is a limit to the viscosity setting of the rust preventive agent prepared for spraying, so the rust preventive agent tends to drip off after application. There were drawbacks. This becomes more noticeable as a large amount of rust preventive agent is applied in order to achieve a long-term rust prevention effect, and the rust preventive agent applied over a long period of time from the application process to the drying process becomes more noticeable. There was dripping, operational and environmental problems.

In recent years, to deal with this problem, the viscosity is low during flow,
Attempts have been made to develop so-called chicken-tropic waxes, which increase in viscosity when stationary, and hot wax materials, which can be sprayed with a low viscosity at high temperatures and become highly viscous when the temperature drops after adhering to the object to be coated. However, nothing that is fully satisfactory has yet been provided.

The present invention is intended to solve the above-mentioned problems, and its purpose is to provide a rust preventive that does not cause the rust preventive to drip during and after the application of the rust preventive. The object of the present invention is to provide a method for applying the same.

(Means for solving the problem) The present inventor has already proposed in Japanese Patent Application No. 60-287195, etc., a method of spraying a mixture of a rust preventive agent and a foaming agent ( However, the present invention is an invention that further improves the solution, and sprays a mixed solution of rust preventive agent and foaming agent using the same air mix method or air spray method as in the past. This is what I decided to add.

That is, the method of applying the rust preventive agent of the present invention involves spraying a mixture of a rust preventive agent and a foaming agent together with pressurized air onto the surface of the object to be coated, or mixing the mixture with air and producing a mixed gas liquid. It is characterized by being sprayed onto the surface of the object to be coated, and has a round shape so that foaming progresses on the surface of the object to be coated.

Here, the rust preventive agent is applied for the purpose of rust prevention treatment, and those conventionally applied for this purpose can be used as they are. Rust inhibitors are mainly petroleum sulfonates,
Solid components such as synthetic sulfonates, lanolin metal salts, oils, microwaxes, petrolatum, and waxes are used to form a rust-preventing coating, and solvent components (e.g. toluene, medium Shiren)
Consists of. In addition, the rust preventive agent contains a rust preventive pigment such as zinc oxide, lead oxide, zinc chromate, etc. as a solid component, and in addition, a plasticizer, a thickener, a hardening agent, etc. are often appropriately selected and mixed.

The foaming agent may be any foaming agent as long as it is compatible with the rust preventive agent, such as propane, petroleum ether, liquefied petroleum gas (LP), etc.
G) Volatile blowing agents such as liquefied natural gas (LNG), chlorofluorocarbon gas, and carbon dioxide, and decomposable blowing agents that generate smoke gas through chemical change such as azobisinobutyronitrile and ammonium carbonate. Can be used.

The mixture of rust preventive agent and foaming agent used in the present invention must be prepared in advance with a rust preventive agent, a foaming agent, and JJ! Depending on the situation, other additives may be mixed and filled into a suitable container such as a tank or bomb. The mixing ratio of the rust preventive agent, foaming agent, and additives to be added as necessary should be determined to form a good rust preventive film and provide a suitable ratio for workability, taking into consideration the foaming state and foam sustainability. Bye.

As additives, surfactants that adjust the foaming state and foam persistence of the blowing agent, such as fatty acid amine salts, sulfosuccinic acid-based arion surfactants, and polyoxyethylene-based nonionic surfactants, can be used. It is advisable to select the most suitable one according to the condition and purpose of the article to which the rusting agent is applied.

The coating method of the present invention is a method of applying a conventionally known air mix method or air spray method to apply the foamed or semi-foamed material to, for example, the outer surface of a plate-shaped body or the inner surface of a bag-like structure.

The flow rate of the pressurized air used here and the mixing ratio with the rust preventive agent/foaming agent mixture may be determined in consideration of the properties of the rust preventive agent and the foaming agent.

(Function) The coating method of the present invention is based on the method proposed by the present inventor in which a rust preventive agent mixed with a foaming agent is sprayed. Therefore, when the foaming agent is sprayed onto the surface of the object to be painted, it evaporates and many bubbles of the rust preventive agent are generated and attached to the surface of the object due to the action of surface tension. The rust preventive agent is difficult to flow and its dripping is suppressed.

Furthermore, in the method of the present invention, since the foaming agent and the like are mixed and contacted with air before spraying, foaming progresses more smoothly than in the above-mentioned method, and the degree of foaming increases significantly, resulting in a bag-like shape. The rust preventive agent is better spread on the inner surface of the object, and dripping of the rust preventive agent is more effectively suppressed by the holding power of the air bubbles. Since the viscosity of the applied rust preventive agent increases during the defoaming process, a rust preventive film can be formed without dripping during or after the coating process.

Note that the foam generated after application may be allowed to defoam naturally, but if there is no risk of the applied rust preventive agent dripping, it may be forcibly defoamed as necessary. Foaming can be eliminated by placing the object to be coated in a drying oven or by blowing hot air on it, making use of viscosity reduction and bubble expansion and bursting.

(Example) Examples of the present invention will be described below based on the drawings. However, the present invention is in no way limited to the following examples.

Example 1 As shown in FIG.
00 parts and LPG blowing agent B2O parts are filled into a pressure-resistant cylinder 1, and after adjusting the internal pressure of the cylinder by a conventional method, they are thoroughly mixed. The cock 3 of the cylinder 1 and the paint inlet of the air spray gun 5 are connected by a paint hose 4. In the figure, 2 indicates a pressure meter. On the other hand, the primary side air piping 7 and the air inlet of the air spray gun 5 are connected to an air hose 8, which includes a ball pulp 9, an air filter 10, a mist separator L/-ta 11. Connected via air regulator 12 and reverse valve 13.

Then, the mixture of the rust preventive agent and the foaming agent B is simultaneously sprayed with air onto the surface of the object to be coated through the nozzle 6 of the gun 5 to apply the rust preventive agent.

Therefore, when spray painting was performed on various objects to be painted, and the painting workability and dripping condition were investigated, it was found that the conventional airless spray method had a 4/aI of 30 to 100.
In contrast, the coating method of Example 1 requires a coating pressure of 1 to 5 kt/ffl and a low air atomization pressure of about % of the coating pressure to achieve sufficiently smooth coating. Moreover, compared to the conventional airless spray method, it was confirmed that it is possible to apply a rust preventive agent 2 to 3 times thicker as long as dripping does not occur.

Embodiment 2 As shown in FIG. 2, a paint hose 4 and an air hose 8 are connected by a connection 14 through check valves 13 and 15, respectively, and this and an airless spray gun 17 are connected to the hose 1.
6, connection is made via the status mixer 15. The same rust preventive agent, foaming agent B, and other components as in Example 1 were used.

Then, the mixture of rust preventive agent A and foaming agent B and air are mixed in the mixer 15, and this mixed gas liquid is passed through the nozzle 6 of the gun 17.
Spray onto the object to be painted.

When the coating workability and dripping characteristics in the method of Example 2 were investigated, the same results as in Example 1 were obtained.

(Effects of the Invention) As explained above, the method of applying a rust preventive agent of the present invention allows foaming to progress smoothly on the surface of the object to be coated through air contact before spraying. The adhesion of the rust agent is further improved, the yield rate is increased, and the amount of rust preventive agent used is reduced. At the same time, the foamed state is maintained for a longer period of time. There is almost no occurrence of dripping #)
Tmm mounting performance is significantly improved.

In addition, the coating method of the present invention can coat the coating at once without the need for double coating including a drying step, even when coating thickly in order to enhance the rust prevention effect by improving the dripping property. This also leads to reductions in work space and capital investment.

The present invention is significant in that it provides a coating method that reduces dripping properties without making any changes to the rust-preventing material and without reducing its rust-preventing effect.

Furthermore, since the method of the present invention allows coating under low pressure conditions, no equipment for high pressure coating is required, making it a safe installation method and reducing investment costs.

Furthermore, since rust preventive agents, foaming agents, etc. can be filled in convenient containers such as aerosol cans, they can be applied not only during the production of the product, but also by the purchaser of the product as needed. is also possible.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing one embodiment of the rust preventive coating method of the present invention, Fig. 2 is a schematic diagram showing another embodiment of the present invention method, and Fig. 3 is a conventional rust preventive coating method. FIG. 2 is a diagram illustrating the method. In the diagram, 1...Pressure cylinder 4...Paint hose 5...
・Air spray gun 7...Primary side air piping 8・
... Air hose 15 ... Status mixer 17 ... Airless spray gun A ... Rust preventive agent B ... Foaming agent fang 1 diagram fang 2 diagram

Claims (1)

[Claims] The method is characterized in that a mixture of a rust preventive agent and a foaming agent is simultaneously sprayed onto the surface of the object to be painted together with pressurized air, or the mixture is mixed with air and the mixed gas liquid is sprayed onto the surface of the object to be painted. How to apply rust preventive agent.