JPH0659620B2 - Policing compound - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing compound used for mirror-finishing stainless steel or the like, and more specifically, it has an excellent polishing rate and the finish of an object to be polished. A polishing compound with a good surface.

Conventional techniques and problems to be solved by the invention Conventionally, in order to polish the surface of a mirror-finished or electroless nickel-phosphorus plating film such as stainless steel,
A compound is used in which an oxidizer such as nitric acid, nitrates, peroxides, chloric acid, oxyacid salts, peroxoic acid salts, and sulfuric acid is added to a slurry composed of abrasive grains such as alumina and water. However, the compounds containing these oxidizing agents can accelerate the polishing rate, but cannot always give a satisfactory polishing surface, and the smoothness of the finished surface is deteriorated especially when used for a long time. However, there is a problem in that the gloss also decreases and the surface condition becomes inferior.

The present invention has been made in view of the above circumstances and has a high polishing rate when mirror-finishing stainless steel or an electroless nickel-phosphorus plating film, and has a good gloss even when used for a long time, and has a smooth surface. The object is to provide a polishing compound that gives a good finished surface.

Means and Actions for Solving the Problems As a result of intensive studies to achieve the above object, the present inventors have found that hydrogen peroxide is added to a slurry containing abrasive grains and water,
When an oxidizing agent selected from nitric acid and nitrate is added, and further a sulfate selected from zinc sulfate and cobalt sulfate is added, the polishing rate can be increased.
It stably gives an excellent finished surface to the object to be polished for a long time, so that it has a good gloss on the surface of stainless steel, stepless nickel-phosphorus plating film, etc.
The present inventors have completed the present invention by finding that they can be finished smoothly.

Therefore, the present invention provides a polishing compound containing abrasive grains and water, which comprises a oxidizer selected from hydrogen peroxide, nitric acid and nitrate, and a sulfate compound selected from zinc sulfate and cobalt sulfate. It is provided.

Hereinafter, the present invention will be described in more detail.

The polishing compound of the present invention comprises abrasive grains, water, hydrogen peroxide, nitric acid and nitrate as an oxidizing agent, and cobalt sulfate or zinc sulfate as a non-oxidizing salt. It has a high speed and is capable of excellently finishing the surface of an object to be polished for a long period of time, and is suitably used as a polishing compound for various wet polishing methods.

In this case, as the abrasive grains, calcium carbonate, clay powder,
Kaolin, silica, bentonite, alumina, chromium oxide, iron oxide, red iron oxide, emery powder, tripoly powder, diatomaceous earth, titanium oxide, zircon, white alundum, alundum, green carborundum, carborundum,
It is possible to use one or a mixture of two or more of natural and synthetic abrasives such as garnet and diamond. Of these, alumina and white alundum are preferably used when polishing the electroless nickel-phosphorus plating film surface. The content of the abrasive grains is preferably 2 to 30% (weight%, hereinafter the same), and particularly 8 to 15% of the entire polishing compound in order to enhance the polishing power. Further, the grain size of the abrasive grains can be variously selected according to the purpose of polishing, but when the surface of the object to be polished is mirror-finished, a grain size of 2 μm or less is preferably used.

Further, as the oxidizer, hydrogen peroxide, nitric acid, A (NO
_{3) 3),} using a mixture of _{Zn (NO 3) 2, Ni} (NO 3) 1 , two or more of _2, such as nitrates.

The content of these oxidizing agents is preferably 0.1 to 30%, particularly 0.3 to 10% of the total polishing compound.

The polishing compound of the present invention is one in which zinc sulfate or cobalt sulfate is further added, and the effect of adding these sulfates is to stably disperse the abrasive grains, stabilize the polishing compound, and reduce the polishing rate even after long-term use. This means that a stable and good finished surface of the object to be polished is provided without doing so, and even if sulfuric acid is added, such an effect cannot be obtained.

Here, zinc sulfate and cobalt sulfate have various hydrated structures, but any form of hydrate may be used, and ZnSO ₄
6H ₂ O and CoSo ₄ · 7H ₂ O are preferably used. Further, the compounding amount thereof is 1 to 35 g / as an anhydride of sulfate in the whole polishing compound, and particularly 3 to
15 g / content is preferable, and if it is less than 1 g /, the effect of improving the finished surface may not be obtained,
If it is more than 35 g / g, the surface condition of the finished surface may be deteriorated.

It should be noted that the polishing compound of the present invention may be added with various additives effective for imparting gloss to the surface of the object to be polished and improving the surface condition, for example, if necessary, a surfactant, etc. Can be added and compounded.

EFFECTS OF THE INVENTION The polishing compound according to the present invention is one which stabilizes the polishing compound, has a high polishing speed, and keeps the finished surface of the object to be polished to be glossy, smooth and excellent even when used for a long time. .

Hereinafter, the present invention will be described with reference to Examples and Comparative Examples.
The present invention is not limited to the examples below.

[Example 1, Comparative Example 1] Three types of polishing compounds having the compositions shown in Table 1 were prepared, and a polishing contest was conducted using the following equipment and conditions. The results are shown in Table 2.

Polishing test equipment and conditions Polishing machine: 9B-5LP (manufactured by Speedfam) Pad: Polyurethane pad Rotation speed: 60 rpm Surface pressure: 100 g / cm ² Compound supply: 50 m / min Polishing time: 3 min Work: 3.5 inch aluminum The disk surface was electrolessly nickel-phosphorus plated. 1 charge 10 sheets. The surface roughness of the polished work was evaluated using Surfcom 550A (manufactured by Tokyo Seimitsu Co., Ltd.) as a measuring device.

The polishing performance was measured by measuring the roughness of the work surface when the polishing was performed 10 times, 30 times and 50 times, and the roughness of each polishing compound was compared.

In addition, the surface state is a microscope, and scratches, protrusions,
It is a result of examining uniformity (grinding).

[Example 2 and Comparative Example 2] Three types of polishing compounds having the compositions shown in Table 3 were prepared, and a polishing test was conducted in the same manner as in Example 1. The results are shown in Table 4.

[Examples 3 and Comparative Example 3] Three types of polishing compounds having the compositions shown in Table 5 were prepared, and a polishing test was conducted in the same manner as in Example 1. The results are shown in Table 6.

[Example 4, Comparative Example 4] Three types of polishing compounds having the compositions shown in Table 7 were prepared, and a polishing test was conducted in the same manner as in Example 1. The results are shown in Table 8.

[Experimental Example] The polishing power of 100 g of alumina to which 875 m of water was added and 16 g of various sulfates shown in Table 9 (without oxidizing agent) was measured. The polishing measurement conditions were the same as those in the above-mentioned Examples and Comparative Examples, but the number of polishing was 10 times.
The results are shown in Table 9.

From the results in Table 9, it was confirmed that zinc sulfate and cobalt sulfate have high polishing power (fast polishing rate).

In this case, this system is a system containing no oxidizing agent, and zinc sulfate and cobalt sulfate have a poor appearance in a system containing no such oxidizing agent, but as is clear from the above examples,
It is recognized that by using a complexing agent in combination with zinc sulfate and cobalt sulfate, it is possible to improve the surface condition and gloss and to give a polished object having a good appearance.

Claims (2)

[Claims] 1. A polishing compound containing abrasive grains and water, comprising an oxidizer selected from hydrogen peroxide, nitric acid and nitrate, and a sulfate selected from zinc sulfate and cobalt sulfate. A polishing compound that does. 2. The polishing compound according to claim 1, wherein the amount of the sulfate compound as an anhydrous salt is 1 to 35 g / the total amount of the polishing compound.