KR101737018B1 - Method for coating manhole with enamel - Google Patents

Abstract

More particularly, the present invention relates to a method for coating enamel of a menhole, which comprises (a) a heat treatment step, (b) a surface peeling step, (c) a low oil coating step, (d) The present invention relates to an enamel coating method of a menhole including an oil-in-oil coating step.

Description

[0001] METHOD FOR COATING MANHOLE WITH ENAMEL [0002]

The present invention relates to an enamel coating method of a menhole.

The enamel coating is generally coated with a glaze of inorganic vitreous on the metal surface, which can show the strength of the metal, the beautiful color of the enamel, and the corrosion resistance. That is, it is possible to produce a metal which is not only resistant to scratches but also has a beautiful color, excellent abrasion resistance and heat resistance by enamelling the surface of a metal which is generally strong and has excellent thermal conductivity, and which is prone to corrosion and scratches. However, in the case of enamel coating, the surface of the coating is easily broken by physical impact.

As disclosed in Korean Patent Laid-Open Publication No. 2001-0044172, enameled products are widely used for gas ranges, heaters, kitchen utensils, kettle, and frying pans which require heat resistance. However, It is difficult to realize a surface which is smooth and has various colors because the surface is roughened and the hydrogen gas in the product is not sufficiently discharged.

Korean Patent Publication No. 2001-0044172

An object of the present invention is to provide a method for enamel coating of a menhole in which the surface of a menhole having a large weight and a large size is coated with an enamel so that the surface is smooth and various colors can be applied and the gloss can be increased.

(A) heat treating the menthol at a temperature of 850 to 1000 占 폚 for 30 minutes to 2 hours; (b) peeling the surface of the heat-treated material hole with a shot ball; (c) uniformly coating the surface of the surface-peeled manifold to a thickness of 50 to 80 占 퐉, drying and then baking at 780 to 820 占 폚 for 30 minutes to 2 hours; (d) uniformly coating and drying the primary oil on the surface of the menhole coated with the lower oil at a thickness of 200 to 250 탆; And (e) uniformly applying a secondary synthetic oil to the surface of the menhole coated with the primary synthetic oil at 80 to 120 占 퐉, followed by drying and then calcining at 780 to 800 占 폚. to provide.

According to the enamel coating method of the present invention, it is possible to remove the hydrogen gas and the burr on the surface of the menhole, to make the surface of the menhole smooth and high in gloss, It is possible to make a manhole.

Figure 1 is a photograph of the surface of an existing membrane.
Fig. 2 is a photograph of the surface of enamel coated menholes according to Example 1. Fig.

Hereinafter, the present invention will be described in detail.

The present invention relates to a method for enamel coating of a menhole, comprising the steps of: (a) a heat treatment step, (b) a surface peeling step, (c) a low oil coating step, (d) And a coating step.

Specifically, in the heat treatment step (a), since the menhole is thick and heavy compared with a product to which general enamel coating such as kitchen appliances is applied, it is preferable to carry out the calcination at a calcination temperature of 850 to 1000 ° C for 30 minutes to 2 hours The graphite powder remaining on the cast iron surface during the casting process of the menhole is burned and decomposed by the heat treatment step, and only the debris after the combustion is removed, so that the efficiency of the work is improved.

In the step (b) of peeling off the surface of the menhole (b), the surface of the heat treated malehole is peeled off from the surface of the high hardness menthol using a shot ball to remove the burr of the edge portion generated in the casting process of the menhole More preferably a shot ball made of SUS430. At this time, it is preferable that the diameter of the short ball is 0.5 to 0.8 mm. If the above range is satisfied, the unevenness of the surface of the male hole can be gently adjusted and the surface roughness can be increased. Further, in the step of peeling the surface of the mandrel, the weight of the mandrel is about 50 kg, so it is preferable to fix the mandrel using a jig made of stainless steel.

In the step (c) of coating the surface of the surface-peeled manifold, it is preferable to use a special casting oil for casting, and the casting oil preferably includes silicon dioxide (SiO ₂ ). By including the silicon dioxide, it is possible to inhibit the generation of hydrogen gas generated in the menthol itself and to enhance the stability of the surface by the lower oil and the upper oil coating. Specifically, it is preferable that the lower oil is uniformly applied to the surface of the surface-peeled menhole at a thickness of 50 to 80 탆, and the resultant is baked at a temperature of 600 to 780 캜 for 30 minutes to 2 hours, The gas can be completely discharged.

In the step (d) of coating the surface of the menhole coated with the low-boiling oil on the surface of the primary intermediate oil, it is preferable to use the high-gloss casting glaze as the opaque glaze for casting only in order to increase the surface roughness of the menhole, It is more preferable that the primary oil contains titanium dioxide (TiO ₂ ). In addition, the primary synthetic oil serves to enhance the color reproduction ability of the secondary synthetic oil.

It is preferable to uniformly coat the primary oil at a thickness of 200 to 250 탆, dry it, and then coat the primary oil, and it is more preferable to dry the primary oil at 140 to 160 캜 for 30 minutes. When the above-described range is satisfied, it is possible to produce a smooth surface having a high degree of gloss and a smooth surface.

In the step (e) of coating the surface of the menhole coated with the primary oil on the secondary oil coating, it is preferable to use a clear glaze as the transparent glaze for casting in order to increase the impact resistance of the secondary oil. Can exhibit abrasion resistance such as glass, and can apply various colors to the surface of the menhole. Specifically, it is preferable that the secondary oil is uniformly applied on the surface of the primary oil-coated menhole, followed by drying, followed by firing at 780 to 800 ° C., It is more preferable to dry it for a minute.

Hereinafter, the present invention will be described in detail with reference to examples.

However, the following examples are illustrative of the present invention, and the present invention is not limited to the following examples.

< Example  1>

1. Heat treatment

In order to apply enamel to the material, the material was calcined at 900 ℃ for 1 hour and heat treated to remove the hydrogen gas inside the cast iron through the heat treatment of the menhole.

2. Surface peeling

The heat-treated male holes were fixed using a stainless steel jig and the surface of the mandrel was peeled off using a stainless steel (SUS430) short ball having a diameter of 0.6 mm for surface peeling, and the burrs generated in the menthol casting process were removed. .

3. Harvest  coating

The surface of the above-mentioned surface-removed member was coated with a special mirror for casting (Pemco Co., Belgium) in a thickness of 50 to 80 탆, dried, and fired at a temperature of 780 캜 for 1 hour, Lt; / RTI &gt;

4. First Xuyu  coating

On the surface of the above-mentioned low-gloss coating, a high-gloss glaze for high gloss casting (WR3701, Pemco, Belgium) was applied in a uniform thickness of 200 탆 and dried to coat the surface of the menhole with the primary synthetic oil.

5. Secondary Xuyu  coating

A secondary oil-free clear glaze (RF2531, Pemco, Belgium) was applied to the surface of the primary oil-coated menhole at a thickness of 100 탆 and dried to coat the surface of the secondary hole with the secondary oil, Respectively.

< Comparative Example  1>

1. Heat treatment

The resultant was annealed at 800 ° C for 1 hour.

2. Surface peeling

The heat-treated material was fixed using a stainless steel jig and the surface of the mandrel was peeled off using a steel ball having a diameter of 1.0 mm for surface separation.

3. Coating

On the surface of the peeled surface of the above-mentioned surface-removed male hole, a special mirror for casting (Pemco, Belgium) was applied in a thickness of 50 to 80 탆, dried and then baked at 790 캜 for 8 minutes. Then, a glaze for high gloss casting (WR3701, Pemco Co., Belgium) was coated and dried at a thickness of 120 탆 to prepare an enamel coated menhole.

In the case of Comparative Example 1, hydrogen gas in the inside of the menhole was not sufficiently removed, bubbles due to the gas spouting were generated, the surface was not smooth and the gloss was low. On the other hand, in Example 1, The hydrogen gas and the burr of the edge portion are removed to form a smooth surface and various colors of high gloss are applied.

Claims (5)

(a) heat treating the menhole at a temperature of 850 to 1000 占 폚 for 30 minutes to 2 hours;
(b) peeling the surface of the heat-treated material hole with a shot ball;
(c) uniformly coating the surface of the surface-peeled manifold to a thickness of 50 to 80 占 퐉, drying and then baking at 780 to 820 占 폚 for 30 minutes to 2 hours;
(d) uniformly coating and drying the primary oil on the surface of the menhole coated with the lower oil at a thickness of 200 to 250 탆; And
(e) uniformly applying a secondary intermediate oil to the surface of the menhole coated with the primary oil at a rate of 80 to 120 占 퐉, followed by drying and then calcining at 780 to 800 占 폚. The enamel coating method of claim 1, wherein the diameter of the shot ball is 0.5 to 0.8 mm. The method of claim 1, wherein the lower oil comprises silicon dioxide. The method of claim 1, wherein the primary oily phase comprises titanium dioxide. The method of claim 1, wherein the secondary oil is a clear glaze.

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