KR890002899B1 - Fluore resin coating method of copper's articles - Google Patents

Abstract

The method comprises (i) electroplating Ni onto copper articles, (ii) sand blasting twice, (iii) spraying 2:1 adhesiveacid mixt. and hardening for 18min at 320±10 deg.C, (iv) spraycoating pigment (fluorocarbon resin) and drying for 1min in the ambient, and (v) painting brightener onto the coated articles and drying for 18-20min at 430±10 deg.C.

Description

Flour Resin Coating Method for Copper Products

The present invention relates to a method of coating a fluororesin on a copper product.

Generally, fluorocarbon polymers refer to synthetic resins obtained by polymerization of fluorine-containing olefins. In particular, fluorocarbon polymers are polytetrafluoroethylene prepared by emulsion polymerization of tetrafluoroethylene. Such as [CF ₂ CF ₂ ] n is very resistant to chemicals, has excellent electrical properties, is stable even at 325 ° C, and has no characteristics of thermoplastic and has a small coefficient of friction. It is widely used as an insulating material and a coating material.

Fluorine resin having the above characteristics has been applied to kitchen utensils that are closely related to our lives in recent years. For example, when the fluororesin is coated on a fryer for general cooking, the fluororesin is used for cooking. There is no change in the resin itself even when heat is applied, and foods that are cooked are not burned well and are not pressed.

However, most kitchen utensils have many products coated with the fluororesin on a base metal made of iron (Fe) or aluminum (Al), but have much better electrical and thermal conductivity than iron or aluminum. Since the product coated with the fluororesin on copper products having good processability and corrosion resistance has not been developed yet, there is a relatively large loss of thermal energy when using products using electricity or other heating means, especially kitchen products. Difficult to process and easily corroded when used for a long time there were many problems.

In addition, in the case of coating fluorine resin on iron or aluminum in the related art, the base metal is formed relatively thick to prevent bending of the base metal during heating (particularly 0.8 mm or more in case of using copper, which has a thickness of 2 mm or more). And, accordingly, there was a problem that the factors of difficulty and manufacturing cost of each hole.

Accordingly, the present invention improves the conventional defects as described above, and is excellent in electrical and thermal conductivity, flexible and malleable, easy to process, and also a coating method for coating a fluororesin on the surface of a copper product having high corrosion resistance. The purpose is to provide.

Hereinafter, the present invention will be described in detail.

The present invention provides a first process of performing nickel electroplating as a pretreatment on a surface of a copper product to be coated, and a second process of sandblasting the coated surface twice, an adhesive and an acid ( acid) is mixed with a spray and then fired at 320 ± 10 ° C. for 18 minutes, a fourth process of spray coating a pigment pigment, which is a fluororesin, with a spray, and then naturally drying for about 1 minute. It is a method of coating a fluororesin on a copper product by applying a polish to cotton and sequentially performing a fifth step of drying for about 18-20 minutes at a temperature of 430 ± 10 ° C. in a drying furnace.

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

In one embodiment of the present invention, a coating made of copper having excellent electrical and thermal conductivity and a fluorine resin, ULTRALCN (manufactured by ICI, UK), is used to make a "Copperion". .

First, one surface of the copper plate to be coated is degreased with an alkali degreasing agent to remove the oil component attached to the copper surface.Then, the surface is washed with dilute sulfuric acid and neutralized with water. Wash again several times to clean the coated surface of the copper product to be coated.

Then, nickel (Ni) electroplating is performed on the surface, wherein the nickel bath conditions are as follows.

Nickel Sulfate (NiSO ₄ 7H ₂ O) 300g / l

Nickel Chloride (NiCl ₂ 6H ₂ O) 60 g / l

Boric acid (H ₃ BO ₃ ) 38g / l

pH 2.5 to 5.5

Temperature 50 ℃

Cathode Current Density 5.4A / dm ²

Bipolar Nickel (Ni)

Soak the copper surface to be coated in the bath for about 6 minutes to form a nickel layer of about 3 ~ 5μ, and then repeatedly wash the surface coated with the nickel layer three times with water and then dry with an electric heater Let's do it. (First process)

Thus, sandblasting is performed twice on the surface coated with 3 ~ 5μ nickel layer, the first process with 180 carpenters and the second with 260 carpenters. Carpenter at this time indicates the size of the grain of sand, the larger the value means that the size of the grain of sand, that is, the unit representing the amount of grain of sand of the same size in a certain area. (Second process)

When the uneven portion is formed on the copper surface to be coated by sandblasting as described above, the coating is performed three times as follows.

The first one is a primer coating, and the adhesive and acid are mixed at a ratio of 2: 1, and then sprayed with a spray and fired at 320 ± 10 ° C for 18 minutes, but the film formed at this time is about 8 ~ 10μ. To form. (Third process)

The second is a middle coating, which is coated with a pigment of a suitable color pigment, which is a fluororesin, on the surface of the first coat, and then air-dried for about 1 minute. (Fourth process)

The third is a top coating, and after applying a varnish for the purpose of protecting the film formed by the primary and secondary coating, and dried in a drying furnace at a temperature of 430 ℃ for 18 to 20 minutes. (5th process)

In this way, when the coating is performed on the copper surface on which the uneven portion is formed three times, a coating having a total thickness of about 25 to 30 μ is formed. If the total thickness of the coating is 30 μ or more, cracks may occur.

As described above, according to the present invention, if the coating is made of copper, which has excellent electrical and thermal conductivity, is excellent in workability and corrosion resistance, and has excellent durability and electrical properties as well as coating a fluororesin which does not exhibit thermoplasticity, In addition, it is possible to conveniently use a variety of copper products used for a variety of other uses, especially in the cooking utensils such as frying pans by coating the fluorine resin using the copper product coating method according to the present invention localizes the loss of thermal energy In addition, the manufacturing cost of the product is also reduced.

Claims (5)

The first step of performing nickel electroplating on the copper surface to be coated, and the second step of sandblasting the plated surface twice, the surface by mixing an adhesive and an acid A third step of firing for about 18 minutes at 320 ± 10 ° C., followed by spraying with an eda spray, followed by a fourth step of spray coating a pigment pigment, which is a fluororesin, with a spray, followed by air drying for about 1 minute; and A fluororesin coating method for a copper product, comprising a fifth step of applying a varnish to the film formed by the fourth step and drying it for 18 to 20 minutes at a temperature of 430 ± 10 ° C. in a drying furnace. The method of claim 1, wherein the nickel electroplating is performed by forming a nickel plated layer having a thickness of 3 to 5 mu. The method of claim 1, wherein the adhesive and the acid are mixed at a ratio of 2: 1. The method according to claim 1, wherein a film of 8 to 10 mu is formed in the third step. The method according to claim 1, wherein a film of 18 to 22 mu is formed in the fourth step.