KR101720642B1 - High-gloss aluminum abrasive chemical composition - Google Patents

Abstract

The present invention relates to a high-gloss aluminum chemical abrasive composition, in which to a chemical abrasive for high-gloss surface of high-strength aluminum products, melamine is added under stirring at room temperature, and the chemical abrasive composition obtained therefrom may be used to perform chemical polishing for 1-3 minutes at 100-110C to perform high-gloss aluminum polishing on high-strength aluminum, wherein the chemical abrasive composition formed by adding melamine under stirring is prepared by adding, at room temperature, 0.3-0.4 wt% of melamine to the following: 80-90 wt% of phosphoric acid; 10-20 wt% of sulphuric acid (H2SO4); 0.15-0.3 wt% of copper nitrate (Cu(NO3)2); 0.01-0.03 wt% of nickel sulfate (NiSO4); and 0.15-0.2 wt% of glycine. The chemical abrasive composition of the present invention, when used to chemically polish the aluminum surface, improves the surface evenness and gloss of the aluminum surface following plating, achieves excellent high-gloss effects, and thus may be used to treat all kinds of aluminum products, including high-strength aluminum, to impart high-gloss effects thereto. Also, the chemical abrasive composition is inexpensive to produce and does not require repeated polishing processes, and therefore has the effects of reducing production time through simplification of production processes and improving productivity, and furthermore, can be applied to various aluminum products to offer high efficiency and high-gloss effects with high reliability.

Description

[0001] High-gloss aluminum abrasive chemical composition [0002]

The present invention relates to a high-gloss aluminum chemical abrasive composition, and more particularly, to a high-gloss aluminum chemical abrasive composition which chemically polishes an aluminum surface to exhibit high gloss of an aluminum surface, To an abrasive composition.

Anodizing is a kind of plating technique which is common to electrolytic plating and the method and equipment, which is also referred to as an aqueous acid method, a direct current sulfuric acid method and an anodic oxidation method, and is one of the recent important plating techniques in which the use and demand of aluminum are gradually increasing.

Anodizing forms a film of aluminum oxide (Al 2 O 3) on the surface of aluminum. When an aluminum component is used as an anode in an electrolytic solution and energized, the aluminum surface is oxidized by oxygen generated in the anode to form a film of aluminum oxide. Is very hard, has high corrosion resistance, and can be dyed with various colors because of its extremely small porosity and fibrous shape. Therefore, it has been practiced to improve the appearance as well as practicality of corrosion resistance and abrasion resistance.

At this time, the higher the purity of aluminum, the more beautiful and lustrous film is formed. There are various kinds of electrolytes used in anodizing, but in Korea, fishery and sulfuric acid are mainly used.

The pretreatment includes mechanical pretreatment, which is physical polishing, and chemical pretreatment. Chemical pretreatment methods include acid cleaning, etching, neutralization (smut removal), and chemical polishing.

Chemical polishing is a process used to polish the product or to remove foreign substances on the surface. It is widely used for exterior materials requiring high gloss. Since the equipment parts are also changing in accordance with the overall flow, For products and small products, always be careful when polishing. Keep proper temperature and keep concentration control according to material to ensure high quality.

The chemical termination of aluminum is a process in which polishing is performed without using an external current, and a process in which the metal surface is dynamically dissolved and smoothed by a chemical reaction.

Electrolytic polishing has a great influence on the polishing state and dimensional change of the high current density region and the low current density region. Therefore, it is difficult to use electrolytic polishing in fields requiring precision workpieces such as LCD parts and semiconductor parts. It can be said to be a kind of magic that solves the problems that have been found.

Thus, the chemical polishing is a process which can be performed without changing the dimensions of the respective parts to be constant and without damaging the function of the product.

However, conventionally used chemical abrasives have problems in that they do not exhibit a uniform polishing effect when applied to aluminum of various materials, and production time due to an increase in process due to repeated use of a chemical abrasive, And lowering of the rate of viability, wasting of materials, and increased cost.

A Korean Patent Registration No. 10-1273973, which has been initiated to solve such a problem, is available. This is a chemical polishing agent composed of phosphoric acid, a polishing agent, a stabilizer, a smoothing agent and sulfuric acid, and has been used as an advantage of being excellent in gloss effect when applied to aluminum.

However, such a conventional chemical abrasive for polish of aluminum has recently been explodingly increasing in demand for aluminum due to the development of small household appliances such as smart phones. In order to improve the durability of products due to this increase, application of high strength aluminum 6013 is generally And the conventional polishing compound is used so that the disadvantage of the high strength aluminum is that the gloss efficiency is inferior to the conventional one in order to have a superior gloss efficiency compared to the conventional one.

As a result, aluminum products have been pouring exponentially from small household appliances to large home appliances, and now it is spread widely in various industrial fields such as leisure, so that it is possible to improve the quality of products through aluminum, And the demand for chemical abrasives for polishing aluminum is demanded in all industrial fields.

However, the conventional chemical abrasives disclosed in Patent No. 10-1273973, which is disclosed for high gloss, are also somewhat limited as chemical abrasives having such high efficiency and excellent gloss effect, and gloss can be applied to various aluminum as described above, When applied to parts such as aluminum 6013, the polishing is not polished by the required gloss, and therefore, there is a demand for an aluminum high-gloss chemical polishing agent which can exhibit high gloss even in high strength aluminum.

In other words, the chemical abrasive disclosed in Japanese Patent No. 10-273973 can be obtained through Sodium Sulfate Anhydrous, which is a silicate of silicate, which is a synonym of the 10-water flame of sodium sulfate added to enhance the final aluminum smoothness and to exhibit high gloss. In order to achieve a high gloss, in consideration of the fact that the gum is formed by sulfuric acid, there is a problem that the added sulfuric acid causes a decrease in gloss due to the role of the initial addition of anhydrous gum. As described above, when applied to high-strength aluminum, it is impossible to increase the polishing efficiency, and a chemical polishing agent for polishing the surface of aluminum having high strength with high gloss is desperately required.

1) Korean Patent Registration No. 10-1273973, registered on June 05, 2013.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method for improving the smoothness of aluminum by chemically polishing the aluminum surface, , A high-gloss aluminum chemical abrasive composition capable of excellently treating the gloss of aluminum products ranging from high-strength aluminum to all aluminum products with high gloss.

In addition, the present invention is capable of shortening the manufacturing time and improving the productivity by simplifying the manufacturing process because it is low in manufacturing cost and does not require repetitive polishing process, and it is possible to provide a high- Another object of the present invention is to provide such a high-gloss aluminum chemical abrasive composition.

In order to achieve the above object, the high-gloss aluminum chemical abrasive composition according to the present invention is characterized in that aluminum is used as a chemical abrasive composition, melamine is added and stirred at room temperature in a chemical abrasive for high surface gloss of aluminum product with high strength, melamine is added and stirred The polishing pad is chemically polished at 100 to 110 ° C for 1 to 3 minutes using the chemical abrasive composition thus prepared, so that high-gloss aluminum polishing of aluminum having improved strength can be performed.

The composition of the chemical abrasive composition formed by mixing and stirring the melamine comprises 80 to 90% by weight of phosphoric acid (H3PO4), 10 to 20% by weight of sulfuric acid (H2SO4) and 0.15 to 0.3% of copper nitrate (Cu (NO3) 0.01 to 0.03% by weight of nickel sulfate (NiSO4), 0.15 to 0.2% by weight of glycine, and 0.3 to 0.4% by weight of melamine.

The present invention relates to a method for improving the gloss of an aluminum product by chemically polishing an aluminum surface to improve the smoothness of the aluminum surface, And it is possible to improve the productivity by shortening the manufacturing time by simplifying the manufacturing process and it is possible to secure high reliability of the various aluminum products High efficiency and high gloss can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a gloss comparative photograph of an embodiment of a high-gloss aluminum chemical abrasive composition according to the present invention. FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below, but may be embodied in various forms.

In the present specification, the present embodiment is provided to complete the disclosure of the present invention and to fully disclose the scope of the invention to a person having ordinary skill in the art to which the present invention belongs. And the present invention is only defined by the scope of the claims. Accordingly, in some embodiments, well known components, well known operations, and well-known techniques are not specifically described to avoid an undesirable interpretation of the present invention.

Like reference numerals refer to like elements throughout the specification. And, the terms used (hereafter) used herein are intended to illustrate the embodiments and are not intended to limit the invention in any way. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. Also, components and acts referred to as " comprising (or comprising) " do not exclude the presence or addition of one or more other components and operations.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless they are defined.

Hereinafter, technical features of the high-gloss aluminum chemical abrasive composition according to the present invention will be described in detail with reference to examples and accompanying drawings.

The high-gloss aluminum chemical polishing composition according to the present invention is characterized in that melamine is added and stirred at a room temperature to a chemical abrasive for high-gloss surface of a high-strength aluminum product and melamine is added thereto at a temperature of 100 to 110 ° C (H3PO4) in an amount of 80 to 90% by weight, sulfuric acid (H3PO4) in an organic solvent at room temperature, and a chemical polishing agent for polishing the surface of the chemical abrasive composition 0.1 to 0.3 wt% of nickel nitrate (Cu (NO3) 2), 0.01 to 0.03 wt% of nickel sulfate (NiSO4), 0.15 to 0.2 wt% of glycine, 0.3 to 0.4 wt% of melamine, Is added and stirred.

The phosphoric acid is contained in an amount of 80 to 90% by weight. The property of phosphoric acid is colorless and odorless and has a high viscosity. When the concentration is high, it is easy to crystallize. Here, the melting point of phosphoric acid is 42.35 ° C, specific gravity is 1.834, deliquescence is present, and 542g is dissolved in 100g of water at 20 ° C. It is nonvolatile and becomes pyrophosphoric acid or polyphosphoric acid when heated, and becomes metaphosphoric acid when heated. It also melts in alcohol. A metal surface treatment agent for removing the rust, chemical polishing, a method for forming a coating film and an electrolytic polishing, or an organic chemical catalyst such as dehydration, condensation polymerization, isomerization and the like, as well as a dyeing industry or a phosphate It is widely used for manufacturing raw materials, food processing and medicine.

In the present invention, phosphoric acid is used as a main component of a chemical polishing composition for aluminum having an excellent gloss improving effect, and serves to chemically polish the surface of aluminum subjected to mechanical polishing.

The sulfuric acid is contained in an amount of 10 to 20% by weight, and sulfuric acid is a colorless viscous liquid such as oil. Crystallize in winter. The melting point is 10.4 캜 and the specific gravity is 1.84 (15 캜). Many minerals and organic matter are melted. When heated, they decompose at 290 ℃ and generate sulfur trioxide. The boiling starts at 317 ° C to give an azeotropic mixture (98.54% aqueous solution). Such sulfuric acid is used as a drying agent and dehydrating agent, and is used for rust removal of iron due to strong oxidizing action.

Accordingly, sulfuric acid in the present invention is mixed with phosphoric acid and functions as a foreign substance removal and oxidation polishing of the aluminum surface through the mechanical polishing process through the oxidizing action.

[0028] As the polishing agent, 0.15 to 0.3 wt% of copper nitrate (Cu (NO3) 2) and 0.01 to 0.03 wt% of nickel sulfate (NiSO4) are contained, and the nitric acid copper molecular weight is 187.56, (II) is known. At 20.5 deg. C or lower, paraffin, 20.5-24.5 deg. Hexahydrate, and 24.5 deg. C or higher trihydrate. Both hexahydrate and trihydrate are blue crystals with deliquescent properties. They are easily soluble in water and ethanol, and when nitric acid and dinitrogen monoxide are added to the trihydrate, white or greenish white anhydrides are obtained.

When the content of nitric acid is less than 0.15% by weight or exceeds 0.3% by weight, the effect of improving the luster of the aluminum surface can be obtained. .

Nickel sulfate (NiSO4) is included in the brightener to control the balance of gloss. 0.01 to 0.03% by weight is contained according to the content of the above-mentioned nitric acid copper, and when it is less than 0.01% by weight or exceeds 0.03% by weight, the gloss of the aluminum surface also deteriorates.

The glycine is contained in an amount of 0.15 to 0.2 wt%, and serves to maintain the stability of the mixture of phosphoric acid, sulfuric acid, a polishing agent and sulfuric acid. If less than 0.15% by weight of the glycine is added, the stability of the mixture is lowered and the reaction is slowed down, thereby lowering the gloss of the aluminum surface. If the content of glycine exceeds 0.2 wt%, the amount of the mixture to be added is reduced, and the polishing effect and gloss effect of the chemical abrasive composition for aluminum, which is also excellent in the effect of improving the gloss, are lowered.

The melamine is mixed with 0.3 to 0.4% by weight. The melamine is generally a heterocyclic amine having an organic base and a trimer of cyanamide. 66% of the mass is made of nitrogen, and when mixed with resin, it has fire-proof property. Melamine is a colorless columnar crystal (recrystallized from water). Melting point 347 ° C (decomposition). It dissolves in hot water and does not dissolve in cold water, hot ethanol. There is sublimation. When heated with formalin, it polymerizes to form a resin. In addition, melamine is used for water-repellent processing of plastics, cloth, paper and the like. Resin, which is made from natural resin, is mixed with melamine, formaldehyde, and preservative. It is used to shine the product.

Therefore, in the present invention, the smoothness of the aluminum surface is improved through the melamine to improve the gloss. That is, melamine acts on the surface of the aluminum surface obtained by chemical polishing of melamine, so that the smoothness of the surface of the aluminum product can be enhanced, and the gloss of the aluminum surface can be further increased through the gloss or light of the melamine itself.

When the content of the melamine is less than 0.3% by weight, the smoothness of the aluminum surface is lowered. When the content of the melamine exceeds 0.4% by weight, the content of the previously mixed mixture is decreased, And the polishing effect is also lowered.

(H3PO4), sulfuric acid (H2SO4) and aluminum nitrate (Cu (NO3) 2) as a brightener at room temperature, as described above, 0.1 to 0.3% by weight of nickel sulfate, 0.01 to 0.03% by weight of nickel sulfate (NiSO4), 0.15 to 0.2% by weight of glycine and 0.3 to 0.4% by weight of melamine.

The mechanically polished aluminum was immersed in the high-gloss aluminum chemical abrasive composition prepared by mixing and stirring the melamine as described above at 100 to 110 ° C for 1 minute to 3 minutes, washed by washing twice in general, and the surface was cleanly dried , The gloss of the aluminum surface is improved.

Hereinafter, comparative examples of the high-gloss aluminum chemical abrasive composition according to the present invention will be described.

≪ Example 1 >

85% by weight of phosphoric acid was added to a heating device equipped with a ribbon mixer, 15% by weight of nitric acid was added thereto and mixed by stirring. Thereafter, as shown in FIG. 1, Was immersed for 1 minute, washed 2 times with water, washed, dried and visually observed.

≪ Example 2 >

15% by weight of nitric acid and 5% by weight of acetic acid were added and mixed with stirring. Thereafter, the mixture was heated and maintained at 100 DEG C, As shown in the figure, the aluminum-6013 specimen having been mechanically polished was immersed for 1 minute, rinsed twice, washed, dried and visually observed.

≪ Example 3 >

In the same manner as in Example 1, 60 wt% of phosphoric acid was added, 15 wt% of nitric acid and 25 wt% of sulfuric acid were added, and the mixture was stirred and mixed. As shown in the figure, the aluminum-6013 specimen having been mechanically polished was immersed for 1 minute, rinsed twice, washed, dried and visually observed.

<Example 4>

Except that 70% by weight of phosphoric acid was added, 5% by weight of nitric acid and 25% by weight of sulfuric acid were added, and 2% by weight of nickel sulfate or nitric acid copper was selected and mixed by stirring. As shown in Fig. 1, the aluminum-6013 specimen having been mechanically polished was immersed for 1 minute, washed twice with water, dried, and visually observed after heating and holding at 100 占 폚, as shown in Fig.

&Lt; Example 5 >

Except that 53 wt% of phosphoric acid was added, 4.5 wt% of nitric acid and 41.6 wt% of sulfuric acid were added, and 0.4 wt% of boric acid and 0.5 wt% of nitric acid copper were added and stirred and mixed, As shown in Fig. 1, the aluminum-6013 specimen having been mechanically polished was immersed for 1 minute, washed twice with water, dried, and visually observed after heating and holding at 100 占 폚, as shown in Fig.

&Lt; Example 6 >

90% by weight of phosphoric acid was first added, and 15% by weight of sulfuric acid, 0.2% by weight of nitric acid copper, 0.02% by weight of nickel sulfate, 0.2% by weight of glycine and 0.3% Thereafter, as shown in Fig. 1, the aluminum-6013 specimen having been subjected to mechanical polishing was immersed for one minute in a state where the temperature was maintained at 100 占 폚, and then washed twice with water, dried, Respectively.

Here, the aluminum 6013 has the properties of the aluminum alloy described in Table 1 below.

Alloy name
Nominal Compositon (%)
Cu

Si
Mn
Mg
Zn
Fe
Cr
Ni
Ti
6013

0.9
0.25
0.35
0.95
-
-
-
-
-

The high-gloss aluminum chemical abrasive composition prepared in Examples 1 to 6 was immersed in the high-gloss aluminum chemical abrasive composition heated and maintained at 100 ° C for 1 minute using the aluminum 6013 sample piece as described above, After washing 2 times with water, it was dried and then visually checked for smoothness and gloss.

Here, the aluminum 6013 specimen of Example 1 having phosphoric acid and nitric acid and the aluminum 6013 specimen of Example 6 were compared with each other. As a result, the gloss of the specimen of Example 6 was excellent, and the specimen of Example 2 with acetic acid added to phosphoric acid and nitric acid And Example 6 were compared with each other. As a result, the gloss of Example 2 was better than that of Example 1, but the gloss of Example 6 specimen was excellent when Examples 2 and 6 were compared.

Further, a comparison between Example 3 and Example 6 in which sulfuric acid was added to phosphoric acid and nitric acid showed that the gloss of the specimen was excellent and the amount of nitric acid was reduced, and nickel sulfate (copper nitrate) was added. And Example 6 were compared with each other. As a result, the luster of the specimen of Example 4 was better than that of the specimen of Example 3, but the luster of the specimen of Example 6 was excellent when the specimen of Example 4 and the specimen of Example 6 were compared.

In addition, when the amount of sulfuric acid in phosphoric acid and nitric acid was increased and boric acid and copper nitrate were added, the specimen of Example 5 and the specimen of Example 6 were compared with each other. As a result, the specimen of Example 4 was brighter than that of Example 5, Example 6 Excellent gloss of the specimen was observed. From the results, it was confirmed that the specimen was produced through Example 6, which is made of phosphoric acid, sulfuric acid, a polish agent (nitric acid copper, nickel sulfate), a stabilizer (glycine) and a smoothing agent The surface smoothness and gloss of the aluminum 6013 specimen impregnated with the high - gloss aluminum chemical abrasive composition showed the best.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. Various changes and modifications may be made by those skilled in the art, The present invention is not limited thereto.

Claims (2)

Aluminum in a chemical abrasive composition,
Melamine is added and stirred at room temperature to a chemical abrasive for high-gloss aluminum surface of high-strength aluminum product, and chemical polishing is performed at 100 to 110 ° C for 1 to 3 minutes using the chemical abrasive composition prepared by stirring and mixing the melamine, Wherein the chemical abrasive composition is prepared by mixing and stirring the melamine with high strength to improve the strength of aluminum, wherein the chemical abrasive composition comprises 80 to 90% by weight of phosphoric acid (H3PO4), 10 to 20% by weight of sulfuric acid (H2SO4) Wherein 0.1 to 0.3% by weight of copper nitrate (Cu (NO3) 2), 0.01 to 0.03% by weight of nickel sulfate (NiSO4) and 0.15 to 0.2% by weight of glycine and 0.3 to 0.4% by weight of melamine are added and stirred. A chemical abrasive composition of aluminum.
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