KR960002945B1 - Surface coating method for pipe - Google Patents

Abstract

The surface coating method comprises (A) mixing metallic powdery paint and styrene monomer in the weight ratio of 3:1-1:3 and leaving the mixture in the atmosphere for 24 hrs ; (B) preparing a painting liquid by mixing the mixture from (A) with at least one solvent selected from methyl isobutylketone or lacquer in the ratio of 1:10-1:20 ; (C) first coating the outer and inner surfaces of the pipe by dipping in the painting liquid and then second coating the outer surface.

Description

Surface coating method of pipe for laundry drying rack

The present invention relates to a surface coating method of a pipe (Pipe) and a laundry drying rack using the pipe of the method, more specifically, a mixture of a metallic powder coating and a styrene monomer in a weight ratio of 3: 1 to 1: 3 as a solvent The surface coating method of the pipe (Pipe) and the pipe produced by the method characterized in that the first coating to the inner surface of the pipe by dipping (Deeping) the cast iron pipe in the diluted solution, and then the outer surface with a powder coating It relates to a laundry drying rack manufactured in a conventional manner.

Generally, there are many pipes used for laundry drying racks, but cast iron pipes are mainly used due to economical aspects and convenience in manufacturing process.

However, laundry drying racks manufactured using cast iron pipes have a problem in that the laundry is rusted when the laundry is dried because the cast iron is oxidized and rusted.

Conventionally, in order to solve the above problems, the outer surface of the cast iron pipe was used by winding vinyl or painting with a powder coating. However, winding the vinyl has reduced durability due to peeling or tearing of the vinyl, and painting the outer surface with powder coating. In one case, rust did not occur on the outer surface, but rust occurred on the inner surface, and the inner surface of the pipe was not only corroded. Also, the parts with frequent contact on the outer surface were peeled off, resulting in rust.

In particular, since there is a lot of moisture in the laundry, if water flows into the inner surface of the pipe or is outside when it is raining, the inner surface of the pipe is severely corroded, causing rust to flow out, damaging the appearance of the product, and deteriorating durability. there was.

Accordingly, an object of the present invention is to provide a coating method of a pipe for coating not only the outer surface of the pipe but also the inner surface to have an excellent appearance and durability.

Still another object of the present invention is to provide a laundry drying rack made of pipe coated with the coating method of the above object.

In order to achieve the above object as well as another object that can be easily expressed in the present invention, the outer surface and the inner surface of the pipe by dipping (deeping) by diluting with a solvent after mixing the metallic powder coating and styrene monomer (Styrene monomer) After coating the coating (Coating) first, and then the coating of the pipe by the second coating with the powder coating on the outer surface, and then using this to manufacture the laundry drying rack to dry the laundry well without rusting and improve the durability Could.

The present invention will be described in more detail as follows.

Generally, the plastic powder is uniformly adhered to the surface of the coated material by using gas as a dispersion medium without using an aqueous solvent such as an organic solvent or latex paint, which is a conventional paint type, and then the powder layer is melted to form a smooth and uniform film. The powder coating method to be used is widely used because of excellent coating performance, ie weather resistance, abrasion resistance, and impact resistance, but is not used because it is difficult to uniformly apply plastic powder to the inner surface of cast iron pipe.

Therefore, in order to paint the inner surface of the pipe, it is dipped with a general liquid paint, but when dipping it with a general liquid paint, it is also coated on the outer surface, which is why the general liquid paint and the powder paint applied during the second coating with the powder paint are applied. This is poor and the workability becomes bad.

In addition, general liquid paints are calcined at 120 to 150 ℃, whereas powder paints are calcined at 180 to 200 ℃, and then general liquid paint is applied to the surface of the coating when calcined by secondary coating with powder coating after primary coating with general liquid paint. There is a problem that deviates from.

Therefore, in the present invention, the powder coating is applied to the inner surface of the pipe by diluting with a solvent, diluting with a solvent, dipping, and drying naturally, and then coating the outer surface with the powder coating on the outer surface as well as the outer surface as well as the powder coating. As a result, a surface-coated pipe having excellent coating film characteristics was obtained.

First, a pretreatment process is carried out for removing and removing pipes which have been cut to a certain length and processed into a form that can be used for laundry drying racks. The pretreatment process is washed with a pretreatment solution commonly used in the art to which the present invention pertains, preferably a low concentration of alkaline aqueous solution or acid solution, to remove the fines generated during cutting and processing.

Next, the metal component paint and the styrene monomer were mixed in a ratio of 3: 1 to 1: 3 (weight ratio) and allowed to stand at room temperature for 24 hours, and then the mixture and the solvent were mixed in a ratio of 1:10 to 1:20 (weight ratio). After preparing a liquid dipping liquid having a concentration of the coating component (metallic powder coating + styrene monomer) of about 5%, the pretreated pipe is dipped.

Metallic powder coating is commonly used in the technical field of the present invention, and the main component of the metallic powder coating resin is low density polyethylene, vinyl chloride resin, cellulose acetbutyrate, polyamide, epoxy resin, polyester, chlorinated polyether, Fluorine resins and the like are mainly used, but meltable resins such as ethylene vinyl acetate copolymer resin, polystyrene, polymethyl methacrylate, polycarbonate, polypropylene, diarylphthalate resin, polyacetal resin may also be used.

The styrene monomer is mixed to improve the adhesion of the metallic powder coating, and the metallic powder coating and the styrene monomer are also mixed in a ratio of 3: 1 to 1: 3 (weight ratio).

If the styrene monomer is used at 25wt% or less, the adhesion of the metal component paint is weak and the dipping process cannot be performed. If it is used at 75wt% or more, the amount of the metal component paint is reduced and the thickness of the coating film produced is thin. There is a disadvantage in that a uniform and uniform coating film is not obtained.

Solvents that can be used in the present invention include methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), diisobutyl ketone (DIBK), toluene, methyl cellosonb, lacquer, etc., methyl isobutyl ketone and lacquer Is particularly preferred.

The mixing ratio of the solvent and the coating component is preferably 10: 1 to 20: 1, and when the coating component is less than 10: 1, the adhesion of the coating component to the surface of the coating is lowered. There is a problem that an uneven coating film is obtained.

Therefore, it is effective to make the coating component into a concentration of about 5%.

The dipping method can be used in all the conventional methods used in the art to which the present invention belongs, but in the present invention, the pipe is transferred to the conveyor, but a dipping tank is formed in the middle so that the pipe is dipping while passing through the dipping tank. At this time, the conveyor conveyance speed was carried out at a speed of 3m / min and the thickness of the coating film was 5 ~ 10㎛ dry thickness. In addition, the conveyor used a conventional "u" type conveyor doping system.

After dipping in the above-described manner, the film is naturally dried at room temperature for about 3 minutes, and then the primary surface is coated as well as the outer surface, and then the outer surface is subjected to secondary coating using ordinary powder coating, and then at a temperature of 180 to 200 ° C. Sintering gave a surface treated pipe.

By using this to manufacture a laundry drying rack in a conventional manner it was possible to obtain a product excellent in durability and appearance.

The following examples further illustrate the invention but do not limit the scope of the invention.

Example 1

Metallic powder paint (DAK Ink Paint Co., Ltd., 074KU almond) and styrene monomer were mixed at 1: 1 (weight ratio) and left at room temperature for 24 hours, and then the mixture and MIBK (methyl isobutyl ketone) were 1: Mixing at 15 (weight ratio) to prepare a coating solution of 5% concentration.

On the other hand, the pipe is cut and processed to the required size and shape, washed with 5% NaOH solution to remove the oil, and then dipped in the paint solution prepared above.

Dipping was carried out while conveying the conveyor at a speed of 3 m / min in a conventional "u" type conveyor dipping system so as to have a dry thickness of 10 m.

After dipping in the above-described manner, the mixture is naturally dried at room temperature for 3 minutes, and then the outer surface is powder-coated with a conventional powder coating (DK Ink Co., Ltd., 074KU Almond) to obtain a pipe with surface treatment.

The pipe was manufactured to the laundry drying rack of the desired form.

As a result of measuring the number of days of drying the laundry and rust generation while leaving the laundry drying rack of the present invention and the laundry drying rack made of pipes coated only with the outer surface, and the laundry drying rack wrapped with vinyl under natural conditions, The product was 10 times more durable.

Claims (1)

The metallic powder coating and the styrene monomer are mixed in a ratio of 3: 1 to 1: 3 (weight ratio), and are left to stand for 24 hours, followed by one solvent selected from the group consisting of methyl isobutyl ketone or lacquer and the like: The pipe for laundry drying rack, characterized in that the outer surface and the inner surface of the pipe are first coated by dipping the pipe into a coating liquid mixed in a range of 10 to 1:20, and then the outer surface is coated with powder coating. Surface coating method.