KR101211849B1 - Painting mathod of aluminium water-tank having good durability - Google Patents

Abstract

PURPOSE: A painting method of aluminum water tank with excellent durability is provided to enhance durability, ultraviolet ray resistance, and corrosion resistance of the aluminum water tank exterior material. CONSTITUTION: A painting method of aluminum water tank with excellent durability comprises the following steps: grease removing and drying aluminium exterior material(s20); sanding the aluminum exterior material through sanding rollers installed in the conveyor(s30); coating the aluminum exterior material with 2 liquid type urethane middle coat primer-surface or primer and drying the coated aluminum exterior material at 20-60 deg. Celsius(s40); coating the aluminum exterior material with thermosetting paint in 13-18 micro meters(s60); and heat treating the aluminium exterior material at 60-80 deg. Celsius(s70). The prasurfe includes acrylic resin as a main component and polyisocyanate as a curing agent. The primer includes either vinyl butyral or zinc chromate. [Reference numerals] (S10) Cutting and processing aluminum exterior material; (S20) Grease removing and drying aluminum exterior material; (S30) Surface processing by sanding method; (S40) Coating primer and drying; (S50) Surface processing by sanding method; (S60) Coating thermosetting paint; (S70) Heat treating; (S80) Painting inspection

Description

  Painting mathod of aluminum water-tank having good durability

The present invention relates to a coating method of an aluminum water tank, and more particularly, by coating a material having corrosion resistance, UV fading and stain resistance to an aluminum water tank exterior material, improving durability, UV fading and corrosion resistance, and selecting various colors. This method relates to a coating method of aluminum water tanks.

Generally, 0.5 ~ 1mm thin aluminum is used as the exterior material of the water tank, but aluminum may be excellent in corrosion resistance because the oxide film protects the base material. Color can not be maintained for a certain period of time, and in the beach with a base, it becomes more violent by the formation of hydroxide film, and to restore it, it is necessary to wash by chemical treatment rather than the general cleaning method, but not only economic cost is incurred The process also has a very troublesome problem.

Even if the aluminum plate is coated with a paint such as general paint, the aluminum surface has low porosity and the surface is smooth, causing cracks and sagging, and durability and UV fading and corrosion resistance are not greatly improved.

Even if the exterior is constructed using a panel steel plate, it still has the problem of discoloration by ultraviolet rays, dislocation corrosion between dissimilar metals, restriction of color selection, and vulnerable to external scratches.

The present invention, in order to solve the above problems, by coating a material having corrosion resistance, ultraviolet ray fading and stain resistance to the aluminum water tank casing, thereby improving the durability against scratches occurring during transportation and operation and discoloration and corrosion of the casing In addition to preventing, it is possible to have a variety of color choices to match the surrounding environment can have a luxurious appearance, and furthermore to provide an aluminum water tank painting method that is easy to repair and manage the water tank.

In order to achieve the above object, the present invention is the first step of removing moisture after degreasing the aluminum exterior cut to a predetermined size; A second step of processing the surface of the aluminum exterior material having passed through the first step through a sanding method; A third step of applying the aluminum exterior material having passed through the second step with a prasape or a primer and then drying it; A fourth step of applying the thermosetting paint containing a UV absorber or a plasticizer to the aluminum exterior material having passed through the third step; And heat-treating the aluminum exterior material having undergone the fourth step at 60 to 80.

The prasape may be a urethane-based prasape, and the thermosetting paint may be an amylroyalized, acrylic, urethane or epoxy based.

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According to the present invention, due to the paint coated on the aluminum water tank casing, the durability of the scratches generated during transportation and operation is improved, as well as preventing discoloration and corrosion of the casing, as well as various colors to match the surrounding environment. This allows the selection to have a luxurious appearance, furthermore has the advantage of easy maintenance and management of the water tank.

1 is a painting procedure of the aluminum water tank casing according to an embodiment of the present invention.

Hereinafter, the coating method of the aluminum water tank of the present invention through the preferred embodiment will be described in detail.

1. Cutting aluminum exterior material (S10)

The aluminum plate used as the exterior material of the water tank generally uses a 0.5 to 1.0 mm thin plate, but may be an aluminum plate having an appropriate thickness depending on the situation.

The shape of the water tank is generally cylindrical, but if necessary, may have various shapes such as square, hexahedron, triangular prism. According to this form, the aluminum sheathing material is cut and processed for each part in accordance with a predetermined standard.

2. Degreasing and water removal (S20)

After degreasing using the dedicated degreasing agent M600, the surface is held by air and moisture is removed from the drying chamber.

3. Surface processing step by sanding method (S30)

The surface of aluminum plate cut to a certain size is processed by sanding method (for example, through a sanding roller installed in a conveyor), and other small plate such as engraving is sandpaper or grinding work if needed (# 400 ~ 600 It is recommended to increase the surface area of primer and plate to increase the adhesion rate by more than 30% to secure the strong adhesion of the coating film and to perform the basic work to increase the corrosion resistance and durability of the product.

4. Step after applying with a prasape or primer (S40)

Prasape prevents rust from forming on aluminum plates and improves adhesion to subsequent paints. The praserfe is preferably a urethane-based praserfe, and the urethane-based praserfe includes a two-component urethane middle paint having an acrylic resin as a main component and a polyisocyanate as a curing agent. Such urethane-based prasapes are preferable in the case where the water-retaining area is large or the prasape should be coated as a whole.

In addition, the primer is usually a paint for metal pretreatment coating, and the metal surface subjected to the carrying process is very active and easy to be rusted, so when the primer is applied, temporary rust can be prevented. The primer is required to have good adhesion to the channel and abundantly quick-drying properties and less adverse effects on cutting and welding. Primer types include long- or short-width etch primers and thick film-type inorganic or organic zinc rich primers. One example of an applicable primer of the present invention includes a vinyl butyral zinc chromate component, and more specifically, a wash primer.

The primer coating works using an air gun and the number of coating is preferably 2 to 3 times, and the fresh time is preferably 1 to 2 times 10 to 20 minutes apart.

When the Prasape or Primer paint work is finished in the drying room at 20 to 60 ℃ 10 minutes to 8 hours, it can be adjusted to the appropriate temperature and time according to the external temperature and humidity.

After the drying process, the surface crack test is carried out. If cracks occur, the cracks are polished and the primer coating process is performed again.

5. step of painting the thermosetting paint (S50)

Thermosetting paint is a coating material which hardens by crosslinking reaction by catalyst and heating, and changes the initial polymerization product into high molecular weight to form a continuous coating film, and it does not melt even when the heated paint is reheated at a predetermined temperature or less.

In the present invention, the thermosetting paint may be an amiroyalkyd based, acrylic, urethane or epoxy based, and the urethane based paint may be an acryl urethane paint.

Preferably, the thermosetting paint includes a UV absorber and a plasticizer. The UV absorber absorbs ultraviolet light that affects the aging of the coating film from the surface layer of the coating film, thereby preventing aging such as reduction in appearance glossiness and discoloration of the coating film. Provides flexibility to the coating, improves its bendability and impact resistance, and further improves the aging resistance, cold resistance and light resistance of the coating.

In addition, hydroxy aluminum (titanium hydroxide) and titanium dioxide (titanium dioxide) are added as needed.

The thermosetting paint is coated using an air gun, and the number of coating is preferably about 2 to 3 times, and the fresh time is preferably 1 to 2 times 5 minutes and 2 to 3 times 7 minutes. At this time, the ratio of the thinner and the curing agent thinner is 2: 1: 0.5, and the volume ratio is set as standard.

6. Heat treatment at 60 to 80 ℃ step (S60)

Through the heat treatment process, the thermosetting paint is hardened. If it is lower than 60 ° C., the surface may be easily scratched or the coating may be damaged. If the temperature is higher than 80 ° C., the surface of the coating together with cracks may be lost or stained. Air can expand through heat and penetrate the paint surface).

After the heat treatment, it is preferable to dry naturally for 1 to 2 days at room temperature after cooling.

7. Painting inspection (S70)

When the water tank aluminum exterior material is coated, the coating surface is inspected. The surface thickness is measured after checking whether there is no foreign matter on the surface and whether it is smooth or uniform in color. The thickness measurement is performed by vernier calipers or It is measured using a micrometer, and the thickness of the coating film is preferably 13 to 18 µm.

If there is a bad surface, use a special polishing pad (e.g. 3M # 1500) to even out the surface and then use the compound to restore the disappeared luster. If problems such as color imbalance and undercoat thickness occur, it is better to repaint.

In general, water tanks may be equipped with installation devices such as water level regulators and chlorine injectors.They may damage the aesthetics by exposing the wires or connectors of these devices, so that they can be opened or closed to accommodate wires or connectors. It is desirable to install the cover on the side of the body in the same material and color as the exterior material.

As described above, the present invention has been described through the step-by-step description according to an embodiment of the present invention, but the scope of the present invention is not limited to the embodiments, and those skilled in the art to which the present invention pertains are essential in the art. It goes without saying that the detailed description of the present invention and the scope of implementation of other forms of embodiments are within the scope.

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Claims (4)

A first step of removing moisture by degreasing the aluminum exterior material cut to a predetermined size and carrying a surface;
A second step of processing the surface by a sanding method through the sanding roller installed in the conveyor through the aluminum exterior material having passed the first step;
After applying the aluminum exterior material, which has undergone the second step, with a primer containing an acrylic resin and polyisocyanate as a hardener, a two-component urethane intermediate paint, a praserpe or a vinylbural resin, or a zinc chromate component, the temperature is 20 to 60 ° C. Drying in a third step;
A third step of coating the thermosetting paint having a volume ratio of 2: 1: 0.5 of the main body, the curing agent, and the thinner, including the ultraviolet absorber, the plasticizer, the hydroxyaluminum, and the titanium dioxide, to the thickness of 2 to 1: 1 to the thickness of 13 to 18 μm. Step 4; And
Heat-treating the aluminum exterior material subjected to the fourth step at 60 to 80 ° C .;
Painting method of the aluminum water tank comprising a. delete delete delete

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