JPS61264183A - Copper surface coloring agent - Google Patents

Abstract

PURPOSE:To obtain a Cu surface coloring agent causing no discoloration by air oxidation by adding an emulsifier to chemicals for coloring Cu by a chemical reaction with the Cu, a film forming agent for forming a protective surface film and a brightener so as to prepare a paste. CONSTITUTION:A film forming agent for forming a protective surface film and a brightener are dissolved by 20-30% in 20-25% naphtha as a solvent, 3-5% emulsifier is added, and they are heated to 80-85 deg.C. After 40-45% hot water is added, an emulsion is prepd. by mixing them by stirring. About 5% K2S is added to the emulsion in accordance with color to be developed, 1-3% stearic acid is further added so as to provide viscosity and to improve uniformity in the quality of the resulting coloring agent, and 1-3% triethanolamine is added so as to keep the wettability. They are then mixed to prepare the paste. The surface of a Cu article to be colored is polished or cleaned by pickling or other method and the resulting coloring agent is applied to the surface of a Cu article to color the surface.

Description

[Detailed description of the invention] 1. Purpose of the invention The present invention relates to various crafts and interior appliances.

This invention relates to a copper surface coloring agent used to color the surface of copper products such as household goods.

Conventionally, this method is used to color the surface of copper products.

There are two methods: a wet method in which a colored film is formed by immersing the product in a bath containing dissolved chemicals depending on the desired color tone, and heating or energizing it to form a colored film; The dry method involves applying a paste of antimony sulfide to the surface of a copper product, and after drying, polishing the surface with a mixed powder of antimony pentasulfide and graphite to form a colored layer.
It was commonly used.

However, in the case of the wet method, sufficient knowledge is required for its management, such as adjusting the bathtub to the optimal conditions for film formation, and it also requires a huge amount of money for work site conditions and treatment of waste liquid. Was. In addition, in the case of the dry method, there is a waste of time in applying a paste-like chemical to the surface and leaving it until it dries, and powder scatters during work because the chemical has to be brushed. In addition, antimony pentasulfide was an extremely expensive chemical.

In addition to the above-mentioned drawbacks, conventional manufacturing methods, especially those using sulfides as chemicals, cause the colored surface of the copper to deteriorate rapidly in the atmosphere, making it impossible to preserve it for long periods of time. Spraying with Utsuka etc. had the disadvantage that the colored surface had to be painted to prevent it from coming into contact with the atmosphere.

Therefore, the emergence of a new coloring agent that can easily color the surface of copper products without requiring special knowledge and that can completely prevent the colored surface from discoloration due to air oxidation has been awaited. It is.

Therefore, it is an object of the present invention to provide a new coloring agent intended to eliminate the drawbacks of such conventional coloring methods.

2. Structure of the Invention The coloring agent of the present invention contains (a) potassium sulfide as the core chemical for coloring, (b) as a surface protective film forming agent to prevent discoloration of the colored copper surface after coloring, and ( C) As a polishing agent for the surface, it is made by kneading candle wax and other waxes, oils and fats, and (d) an emulsifier (surfactant) into a paste.

An example of the constituent components of the colorant and its manufacturing method are as follows.

20-30% of surface protection film forming agent and brightening agent.

Dissolved in 20-25% naphtha used as a solvent.

Add 3-5% emulsifier to this, heat it to 80-85C, add 40-45% hot water and mix with stirring, then add potassium sulfide in an appropriate amount suitable for color development (usually 5% Add before or after).

In addition, for the purpose of uniformizing and improving the quality of the colorant,
Stearic acid is added to give it stickiness, and triethanolamine is added to keep it wet.
It is best to add about 3%.

Therefore, when using this coloring agent, the copper surface of the product to be colored must be polished or cleaned by acid washing, etc., and then the coloring agent of the present invention is applied thereto and then polished. Rub it in with a cloth until you get the desired color. After rubbing and coloring, the colorant contains a protective film-forming agent, which prevents the colored surface from coming into contact with the atmosphere and prevents the colored surface from deteriorating in the atmosphere. However, if necessary, a transparent lacquer can be applied on the colored surface, but this lacquering can be done at some time after the coloring, unlike in the conventional process, so that the coloring and lacquering can be done at the same time. The steps can be performed separately in time.

4. Effects of the Invention As described above, the present invention provides a copper surface coloring agent which is made by kneading together a chemical that colors through a chemical reaction with copper and a wax for forming a protective film and polishing into a paste using an emulsifier. Therefore, any number of people can easily color copper surfaces without requiring any specialized knowledge or skill, and the drawbacks of conventional coloring methods can be wiped out. In addition, since it is in a paste form, it is now possible to color the copper surface part in the desired color according to the customer's request even after the on-site installation work is completed during interior decoration work. It has become possible to do things that were impossible with the coloring method, and the effect is extremely large.

Furthermore, the coloring agent of the present invention is characterized in that by changing the chemical agent that is the core of coloring, it is possible to color metals other than copper ingots.

Claims (1)

[Claims] A copper surface coloring agent characterized by comprising a paste-like composition of a chemical agent, a surface protective film-forming agent, and a brightening agent that causes a chemical reaction with copper to cause coloring, and an emulsifier.