KR100731813B1 - A plating way to improve a characteristic of the engineering plastic face - Google Patents

Abstract

A plating method for improving surface characteristics of an engineering plastic resin is provided to obtain a beautiful external form and an electro-magnetic shielding effect by performing plating of an engineering plastic resin excluding ABS and ABS-containing resin by both electroless plating method and electroplating method. A plating method for improving surface characteristics of an engineering plastic resin comprises: an ultrasonic electrolytic degreasing step of removing alien substances covered on the surface of the engineering plastic resin; a solvent treating step of coating the engineering plastic resin passing through the ultrasonic electrolytic degreasing step with the diluted paint after diluting using a diluent a paint obtained by injecting MEK(methyl ethyl ketone), DMF(N,N-dimethyl formamide), XY(xylene), IPA(isopropyl alcohol) and BC(butyl cellosolve) into an agitator, thereby dissolving and liquefying the materials; an electroless-plating step of performing plating of the solvent treated engineering plastic resin, thereby forming a conductive coating film on a surface of the solvent treated engineering plastic resin to enable electroplating to be performed on the electroless-plated engineering plastic resin; an electroplating step of performing plating of the engineering plastic resin passing through the electroless-plating step to impart a peculiar gloss or matt effect of metal itself to the engineering plastic resin and increase corrosion resistance and wear resistance of the engineering plastic resin; and a cleaning and drying step of removing harmful substances of the electroplated engineering plastic resin and drying the harmful substance-removed engineering plastic resin.

Description

A plating way to improve a characteristic of the engineering plastic face}

1 is an exemplary view showing a result of abrasion test of the coating film of the engineering plastic resin according to the present invention with sandpaper,

Figure 2 is an exemplary view showing a result of the wear test of the coating film of the engineering plastic resin according to the present invention with an eraser,

3 is an exemplary view showing a result of closely testing a coating film of an engineering plastic resin according to the present invention;

4 is an exemplary view showing a result of testing the durability of the coating film of the engineering plastic resin according to the present invention;

The present invention relates to a plating method for improving the surface properties of an engineering plastic resin, and more particularly, in the case of plating metal on engineering plastics except for resin products containing a large amount of ABS and ABS, the adhesion of metal plating to the resin It provides a plating method for improving the surface properties of engineering plastic resins to improve the surface properties of the resin and shield electromagnetic waves by using electroless plating methods and electroplating methods together to provide a complete coating of resin products. It is.

In general, metal plating of plastic parts is known to be of significant commercial importance because the desirable properties of both the placemat and the metal combine to provide the respective technical and aesthetic advantages.

Therefore, plating plastics with a shiny metallic surface treatment is more economical in terms of cost and weight than replacing molded plastics with metals, and additionally, the plated surface treatments may be applied between the plastic substrate and the plated metal. It does not undergo pitting and corrosion because no pavanic reaction occurs.

Many methods have been developed to improve the adhesion of metal plating to plastics during plastic plating, and these methods generally use solvents to swell and condition the plastics before plating and then use oxidants to There is a need for a surface processing step of etching the surface, which has been conventionally performed only for a composite resin product containing a large amount of an ABS component that is easily surface-processed.

However, ABS has a problem in that it is weak in heat, and unlike ABS, the use of engineering presticks having not only weather resistance and mechanical strength but also impact resistance is expanding.

In addition, the problem of plastic plating is that the existing electroless plating method is difficult to provide a smooth coating and virtually perfect coating of the metal plating, except the ABS and the resin containing a large amount of ABS. Is that there is.

The present invention has been proposed to solve the conventional problems as described above, the object of which is to improve the adhesion of metal plating to engineering plastic resin except ABS and ABS components, and to provide a complete coating of resin products It is an object of the present invention to provide a plating method for improving the surface characteristics of an engineering plastic resin using a sea plating method and an electroplating method to enable a beautiful appearance and electromagnetic shielding effect.

The present invention for achieving the object as described above and to solve the conventional problems is to improve the surface properties of engineering plastic resin products except ABS and a resin containing a large amount of ABS, using the engineering plastic resin Ultrasonic electrolytic degreasing step to remove foreign substances such as contaminants, fingerprints, oils and fats on the surface, and to maintain the surface state that can be plated by applying a paint diluted with a diluent to the engineering plastic resin from which the foreign substances were removed Solvent treatment step, and the electroless plating step so that the electroplating is possible by plating so that a conductive film is formed on the surface of the solvent-treated engineering plastic resin, the electroless plating step of the engineering plastic resin of the metal-specific gloss or matte Endowed with corrosion resistance and abrasion Composed of a washing and drying steps that by electroplating step of coating so that the property is increased, the removal of harmful substances in the electroplated engineering plastic resin and dried.

By removing the foreign substances on the surface of the engineering plastic resin using alcohol, the coating effect of the solvent treatment step is very excellent.

Meanwhile, the solvent treatment step includes MEK (Methyl Ethyl Ketone: Methyl Ethyl Ketone), DMF (NN-Dimethly Formamide), XY (Xylnen: Xylene), and IPA Iso-Prapyl Alcohol (isoprafil alcohol) and BC (Butyl Cellosolve: butyl cellosolve) are put together in a stirrer to dissolve and liquefy the paint with diluent.

At this time, the paint is composed of MEK 30 ~ 35wt%, DMF 42 ~ 47wt%, XY 12 ~ 15wt%, IPA 2 ~ 5wt%, BC 2 ~ 5wt% and mixed and dissolved in the stirrer for 2 hours to liquefy the diluent Diluted to apply to the engineering plastic resin, by mixing in the above ratio is to improve the adhesion between the surface material and the plating.

On the other hand, the electroless plating step, the etching step of immersing the solvent-treated engineering plastics in the treatment solution mixed with chromium oxide and sulfuric acid and washed with water to etch the plating film has a strong adhesion, and the etched engineering plastic resin 10% A neutralization step of immersing in hydrochloric acid mixed at a concentration and maintaining at 25 to 35 ° C. for 30 to 60 seconds, followed by washing with water to neutralize the chromium oxide and sulfuric acid to prevent unplating during electroless plating; A first active step of immersing the engineering plastic resin in a treatment solution in which a tin (Sn) and a paradium salt are mixed in a 10: 1 mixture with a catalyst and hydrochloric acid for 1 to 3 minutes, followed by washing with water to form a catalyst layer; The engineering plastic resin in the active stage was immersed in sulfuric acid solution for 1 to 3 minutes, washed with water, and then immersed in sodium hydroxide solution for 30 seconds, and washed with water to activate the catalyst layer. It is composed of a second active step to enable the precipitation of the chemical plating, and a nickel plating step of immersing the engineering plastic resin passed through the active step in the chemical nickel plating solution and washing it with water to form a conductive film.

Here, the treatment solution of the etching step is chromium oxide (Cr0 ₃ ) 55 ~ 60vol% and sulfuric acid (H ₂ SO ₄ ) 15 ~ 25vol% is mixed and the remainder is made of water, while the treatment solution is 65 ~ 75 ℃ The engineering plastic resin is immersed for 5 to 30 seconds and washed with water to make the plated film have a strong adhesion to the resin.

The treatment liquid of the first active step is a mixture of 7.5vol% of catalyst (catalyst), 10vol% hydrochloric acid (HCL) and the rest is made of water, the first active step of maintaining the engineering plastic resin at 20 ~ 30 ℃ It is immersed in the treatment solution for 1 to 3 minutes and washed with water to precipitate a catalyst on the surface of the engineering plastic to activate the surface of the engineering plastic to form an electroless plating film.

Here, the catalyst is a mixture of tin (Sn) and palladium salt in 10: 1.

In the second active step, sulfuric acid (H ₂ SO ₄ ) solution is provided to maintain a temperature of 40 ~ 50 ℃ as a concentration of 15%, the sodium hydroxide (NaOH) solution is 40 ~ 50 as a concentration of 10% To maintain a temperature of < RTI ID = 0.0 >

By immersing in a sulfuric acid solution and sodium hydroxide solution and washing with water, it is activated to the catalyst layer formed on the surface of the engineering plastic resin to enable the deposition of chemical plating.

In addition, the lower nickel plating step is immersed in a chemical nickel plating solution of 25 ~ 30 ℃ 5 to 8 minutes and then washed with water to create a conductive film on the surface of the engineering plastic resin to enable electroplating and to coat a stable metal film In order to perform, the chemical nickel plating solution is made of 20vol% nickel plating solution the rest.

On the other hand, the electroplating step, the electrolytic plating step of the electrolytic copper on the surface of the engineering plastic resin of the electroless plating step to ductility, adhesion and gloss, the treatment liquid containing nickel as the main raw material in the engineering plastic resin of the lactic acid copper step Chromium to prevent the nickel plating film from discoloring in the engineering plastic resin of the electronickel plating step, which is coated with a predetermined current density to make it glossy or matte, increase scratch resistance, and provide corrosion resistance. A chromium plating step of providing a wear resistance by plating a treatment liquid as a main raw material at a predetermined current density.

In the copper lactate step, copper sulfate (CuSO ₄ ㆍ 5H ₂ O) 20vol%, sulfuric acid (H ₂ SO ₄ ) 6vol%, copper plating polisher 0.1vol%, building polisher 1vol% is mixed with the rest of the engineering plastic resin It is immersed in the treatment liquid for 10 to 20 minutes under conditions of current density of 3 to 4 A / dm ² and a temperature of 20 to 30 ° C, followed by washing with water.

By plating copper lactic acid as described above, the surface of the engineering plastic has ductility and adhesion, bright gloss and electromagnetic waves are shielded.

The electro-nickel (Ni) plating step is an engineering plastic resin subjected to the lactic acid copper plating step nickel sulfate (NiSO ₄ ㆍ 6H ₂ O) 24 ~ 32vol%, nickel chloride (NiCL ₂ ㆍ 6H ₂ O) 4 ~ 5vol%, boric acid (3BO ₃ ) 3 to 5 vol%, polish agent 0.32 to 0.55 vol% is mixed and the remainder is immersed for 5 to 15 minutes under the condition of current density 4 ~ 5A / dm ² , temperature 50 ~ 55 ℃ in water treatment solution It consists of washing with water.

In addition, the electroplating (Ni) plating step, the engineering plastic resin subjected to the lactic acid copper plating step of nickel sulfate (NiSO ₄ ㆍ 6H ₂ O) 46 ~ 50vol%, nickel chloride (NiCL ₂ · 6H ₂ O) 2.5 ~ 4.0vol %, Boric acid (3BO ₃ ) 3.7 ~ 4.5vol%, polisher 2.1 ~ 3.1vol% are mixed and the remainder is 5 ~ 10 minutes under the condition of current density 3 ~ 5A / dm ² , temperature 50 ~ 55 ℃ Soaking and then rinsing.

Thus, by completing the electro-nickel plating on the engineering plastic resin completed with lactic acid copper plating, the decorative effect on the plastic resin product can be exhibited. Also, the matte plating prevents fingerprints and scratches when the product is touched by hand. It will be possible.

In the chromium plating step, chromium oxide (CrO ₃ ) 20 to 30 vol% and sulfuric acid (H ₂ SO ₄ ) 0.07 to 0.15 vol% are mixed with the engineering plastic resin of the electronickel plating step, and the remainder is a current in a treatment liquid made of water. It is composed by immersing for 2 ~ 5 minutes in the condition of density of 8 ~ 32A / dm ² and temperature of 38 ~ 52 ℃ and washing with water.The chromium plating gives abrasion resistance to the surface of engineering plastic resin and gives chrome metal luster. Will be.

On the other hand, the washing and drying step is immersed for 1 to 2 minutes in 100% pure water (H ₂ 0) of 20 ~ 30 ℃ in order to completely remove the chromium oxide of the engineering plastic resin and washed by washing with water, It is completed by circular dehydration and drying to completely remove the moisture of the engineering plastic resin.

Referring to the test for the wear, adhesion, durability of the plating film of the engineering plastic resin plating is completed as described above through the embodiment as follows.

<Example 1>

As shown in FIG. 1, the coating film of the engineering plastic resin completed with plating was subjected to abrasion test 130 times with a load of 500 g / cm ² using 800 Cw sand paper, and the thickness of the coating film was 13.04 μm in nickel and 0.34 μm in chromium.

The resin layer of the engineering plastic did not appear even after the abrasion test was performed under the above conditions.

<Example 2>

As shown in FIG. 2, 200 times of wear tests were performed using an eraser coated film of engineering plastic resin at a load of 500 g / cm ² , and the thickness of the coating film was 13.04 μm in nickel and 0.34 μm in chromium.

As a result of performing the abrasion test under the above conditions, the resin layer of the engineering plastic did not appear even after 200 abrasion tests.

<Example 3>

As shown in FIG. 3, the plated shape of the engineering plastic resin plated as shown in FIG. 3 was pulled using a tape, but there was no peeling phenomenon.

<Example 4>

As shown in FIG. 4, after forming a scratch using a metal material on the coating film of the engineering plastic resin completed with plating, the restoring force was confirmed by rubbing two or three times using a hand. The thickness of the coating film was 13.04 μm in nickel and 0.34 μm in chrome. to be.

The durability test was performed under the above conditions, and the scratched part was restored.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

The effect of the present invention can be expected by the configuration and action as described above, after the electroless plating process on the surface of the PDA, mobile phone, notebook, etc., engineering plastic resin products except ABS and ABS-rich resin, nickel and chromium It is possible to show the effect of decorating the outer surface of the product with a gloss or matte by electroplating method, and excellent surface strength, wear resistance, heat resistance is improved not only to improve the resin surface but also to shield electromagnetic waves to be.

Claims (12)

In plating engineering plastic resins except for resins containing a large amount of ABS and ABS, An ultrasonic electrolytic degreasing step of removing foreign matter from the surface of the engineering plastic resin; MEK (Methyl Ethyl Ketone), DMF (NN-Dimethly Formamide), XY (Xylnen: Xylene), and IPA (Iso-Prapyl Alcohol: Iso) in the engineering plastic resin Solvent processing step of diluting and applying a diluent material to the liquefied paint) and BC (Butyl Cellosolve: Butyl Cellosolve) together in a stirrer; An electroless plating step of plating to form a conductive film on the surface of the solvent-treated engineering plastic resin to enable electroplating; An electroplating step of imparting metal-specific gloss or matte to the engineering plastic resin of the electroless plating step and plating to increase corrosion resistance and abrasion resistance; A washing and drying step of removing and drying the harmful substances of the electroplated engineering plastic resin; Plating method for improving the surface properties of the engineering plastic resin, characterized in that consisting of. The method of claim 1, The coating method of the solvent treatment step is MEK30 ~ 35wt%, DMF42 ~ 47wt%, XY12 ~ 15wt%, IPA2 ~ 5wt%, BC2 ~ 5wt% Plating method for improving the surface properties of the engineering plastic resin. The method of claim 1, The electroless plating step, the etching step of immersing the solvent-treated engineering plastics in the treatment solution mixed with chromium oxide and sulfuric acid for 5-30 seconds, washed with water; A neutralization step of immersing the etched engineering plastic resin in a 10% concentration and immersing in hydrochloric acid maintaining 25 to 35 ° C. for 30 to 60 seconds and then washing with water; The neutralized engineered plastic resin was immersed in a catalyst in which tin (Sn) and a paradium salt were mixed at 10: 1 and a treatment solution in which hydrochloric acid was mixed with the catalyst for 1 to 3 minutes, and washed with water to form a catalyst layer. 1 active step; A second active step of immersing the engineering plastic resin of the first active step in a sulfuric acid solution for 1 to 3 minutes and then rinsing in sodium hydroxide solution for 30 seconds and then washing with water; Haji nickel plating step of immersing the engineering plastic resin passed through the active step in the chemical nickel plating solution for 5-8 minutes and washed with water; Plating method for improving the surface properties of the engineering plastic resin, characterized in that consisting of. The method of claim 3, wherein The treatment liquid of the etching step is mixed with chromium oxide (Cr0 ₃ ) 55 ~ 60vol% and sulfuric acid (H ₂ SO ₄ ) 15 ~ 25vol%, the remainder is made of water and engineering characterized in that to maintain a temperature of 65 ~ 75 ℃ Plating method for improving the surface properties of plastic resins. The method of claim 3, wherein The treating solution of the first active step is 7.5 vol% of the catalyst, 10 vol% of hydrochloric acid and the rest is made of water, the plating method for improving the surface properties of the engineering plastic resin, characterized in that to maintain a temperature of 20 ~ 30 ℃. The method of claim 3, wherein The sulfuric acid solution of the second active step is provided at a concentration of 15% and maintains a temperature of 40 ~ 50 ℃, sodium hydroxide solution is provided at a concentration of 10% and engineering plastics, characterized in that maintained at a temperature of 40 ~ 50 ℃ Plating method to improve the surface properties of the resin. The method of claim 3, wherein The plating process for improving the surface properties of the engineering plastic resin, characterized in that the chemical nickel plating solution of the nickel plating step is made of 20vol% of nickel plating solution and the remainder of water and maintaining a temperature of 25 ~ 30 ℃. The method of claim 1, The electroplating step, the lactic acid copper step of electroplating lactic acid copper on the surface of the engineering plastic resin of the electroless plating step; An electric nickel plating step of plating a processing liquid containing nickel as a main raw material on the engineering plastic resin of the copper lactate step; A chromium plating step of plating a treatment liquid containing chromium as a main raw material to prevent discoloration of the nickel plating film on the engineering plastic resin of the electric nickel plating step; Plating method for improving the surface properties of the engineering plastic resin, characterized in that consisting of. The method of claim 8, In the copper lactate step, 20 vol% copper sulfate, 6 vol% sulfuric acid, 0.1 vol% copper plating polisher, and 1 vol% building glaze are mixed, and the current density is 3-4 A / dm ² , Plating method for improving the surface properties of the engineering plastic resin, characterized in that immersed for 10 to 20 minutes in a condition of temperature 20 ~ 30 ℃ and washed with water. The method of claim 8, In the electro-nickel plating step, the engineering plastic resin is mixed with nickel sulfate 24-32 vol%, nickel chloride 4-5 vol%, boric acid 3-5 vol%, polisher 0.32-0.55 vol%, and the remainder is a current density in a treatment liquid consisting of water. Plating method for improving the surface properties of the engineering plastic resin, characterized in that immersed for 5 to 15 minutes at a condition of 4 ~ 5A / dm ² , temperature 50 ~ 55 ℃ and washed with water. The method of claim 8, In the electronickel plating step, the engineering plastic resin is mixed with nickel sulfate of 50 to 50 vol%, nickel chloride 2.5 to 4 vol%, boric acid 3.7 to 4.5 vol%, polisher 0.21 to 0.31 vol%, and the remainder of the current density in a treatment liquid consisting of water. Plating method for improving the surface properties of the engineering plastic resin, characterized in that immersed for 5 to 10 minutes in a condition of 3 ~ 5A / dm ² , temperature 50 ~ 55 ℃. The method of claim 8, In the chromium plating step, the engineering plastic resin is mixed with 20 to 30 vol% chromium oxide and 0.07 to 0.15 vol% sulfuric acid, and the remainder is water at a current density of 8 to 32 A / dm ² and a temperature of 38 to 52 ° C. Plating method for improving the surface properties of the engineering plastic resin, characterized in that immersed for 2 to 5 minutes and washed with water.

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