JPS61257763A - Polishing agent - Google Patents

Abstract

PURPOSE:To improve sharpness of abrasive grains while to prevent cohesion and to prevent dispersion under grinding by adding hydrophilic fiber material into polishing agent employing aqueous dispersion medium. CONSTITUTION:Polishing grains such as artificial diamond powder is employed where the average grain size is selected with correspondence to the purpose. While micro fibril cellulose is employed as hydrophilic fiber material. The diameter is shorter than several (mum) and suitable for catching the abrasive grains in dispersed condition. Since cellulose is sufficiently long when compared with the diameter of fiber, dispersed condition can be maintained in dispersion medium. Consequently, the abrasive grains can be caught even upon application of high shearing force thus to prevent dispersion. Water, alcohol or their compound is employed as aqueous dispersion medium. Consequently sharpness of abrasive grains is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to an abrasive used for polishing, such as lapping.

"Prior Art and its Problems" In precision machining of metals, glass, etc., grinding is performed using an abrasive made by dispersing abrasive grains in a dispersion medium, such as lapping.

Conventionally, such abrasives have average particle diameters of 0.1 to 50 and are made of diamond, carporundum, 7 random, etc.
The silica abrasive grains are dispersed in an oil-based or aqueous dispersion medium.

However, abrasives using an oil-based dispersion medium have a problem in that an oil film is formed on the surface of the abrasive grains, the abrasive grains are not sharp, and the grinding operation takes time.

Furthermore, abrasives using an aqueous dispersion medium have a problem in that abrasive grains precipitate and aggregate during storage, resulting in larger particles.

Furthermore, when these conventional abrasives are used, for example, in lapping, a shearing force is applied between the workpiece and the lapping, and the abrasive grains tend to gradually flow to surrounding areas with lower resistance. As a result, there is a shortage of abrasive grains interposed between the workpiece and the lap, making it impossible to perform the grinding work efficiently.

``Object of the Invention'' The object of the present invention is to provide an abrasive that has good sharpness of abrasive grains, does not agglomerate, and prevents abrasive grains from escaping to the surroundings during grinding. be.

"Structure of the Invention" As a result of intensive research to achieve the above object, the present inventor has discovered that an abrasive with excellent performance can be obtained by adding a hydrophilic fibrous substance to an abrasive using an aqueous dispersion medium. The present invention was completed based on the discovery that the present invention is possible.

That is, the abrasive of the present invention is characterized in that abrasive grains and a hydrophilic fibrous substance are dispersed in an aqueous dispersion medium.

Thus, in the present invention, by adding the hydrophilic fibrous material, the abrasive grains are captured by the hydrophilic fibrous material and maintained in a dispersed state. Moreover, the hydrophilic am-like substance prevents the abrasive grains from escaping to the surrounding area during grinding, thereby increasing the efficiency of the grinding operation. Furthermore, since an aqueous dispersion medium is used, the sharpness of the abrasive grains is improved.

In the present invention, various types of abrasive grains can be used, such as natural diamonds, corundum, spinel emery, garnet, silica, etc., artificial diamonds, cubic poron nitride (C
BN), alundum, carporundum, boron carbide,
Synthetic products such as lanthanum carbide, zirconium carbide, and titanium oxide, as well as cerium oxide, chromium oxide, iron oxide, gold steel sand, silica sand, manganese steel balls, glass peas, walnut powder, iron powder, quartz diatomaceous earth, Specific media for barrel polishing may be used alone or in a mixture thereof. Among these, artificial diamond powder is particularly preferred. In addition,
The average particle size of these abrasive grains may be selected, for example, in the range of 0.1 to 50 μl depending on the purpose.

Although various hydrophilic fibrous materials can be used, microfifurylated cellulose is particularly preferred. Microfifurylated cellulose is natural cellulose that has been physically treated to become finely divided into microfifurils. Specific examples of such microfifurylated cellulose include rMFcJ (trade name, manufactured by Daicel Chemical Industries, Ltd.). Microfifurylated cellulose has a diameter of several micrometers or less, which is convenient for capturing abrasive grains in a dispersed state, and the length of microfifurylated cellulose is sufficient compared to the fiber diameter. Because of its long length, it can maintain its dispersed state in the dispersion medium. Therefore, even if a high shearing force is applied, the abrasive grains can be captured and prevented from scattering to the surroundings. In addition, as the hydrophilic fibrous substance, cotton, regenerated cellulose, polyvinyl formal, etc. can also be used.

Examples of the aqueous dispersion medium include water, alcohol, and mixtures thereof.

In addition to these, thickeners such as methylcellulose, ethylcellulose, and starch, dispersants, rust preventives, and the like may be added and mixed.

The blending ratio of each component is not particularly limited, but for example, 0.2 to 20% by weight of abrasive grains, 0.0% of hydrophilic FaIa-like material
It is preferable that the amount is 4 to 20% by weight, with the remainder being an aqueous dispersion medium.

Moreover, the fiber diameter of the hydrophilic fibrous material is preferably 0.2 to 5 times the average particle diameter of the abrasive grains. Fj & fiber diameter is 0.
If the fiber diameter is less than 2 times, the effect of capturing abrasive grains is not sufficient, and if the fiber diameter exceeds 5 times, the polishing efficiency tends to decrease.

"Embodiments of the Invention" An aqueous dispersion containing 1% by weight of microfifurylated cellulose "MFC" (trade name, manufactured by Daicel Chemical Industries, Ltd.) with a solid content of 20 @ Ai, an average particle size of 31 L, a single crystal of intestines First, 1 g of diamond powder was mixed, and then 20 afL of an aqueous solution containing 0.1% by weight of "Metrose" (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) as a thickener was added to this mixed solution. Furthermore, add 80 ran of water to this mixture,
Finally, 2.4++ JL of rust preventive was added to obtain an abrasive.

When this abrasive was allowed to stand still for a long period of time, the abrasive grains settled, but when it was shaken a little, it immediately became a uniform suspension, and no aggregates were formed in the container.

The conditions under which a polishing test was conducted using this abrasive were as follows: Work material: Ferrite (5m+a x 5mm, thickness 0.
8+a+s) Surface plate rotation speed; 400 rpm, weight 7
50 kg/cm'' condition: 2 sprays at the initial stage, lO
After 5 minutes, 1+sJl was injected every 5 minutes.

As a result, the amount of lapping after 20 minutes of polishing was 0.180 +
It was am.

On the other hand, when a similar test was conducted using a commercially available abrasive (containing the same amount of the same single crystal diamond powder), the lapping amount after 20 minutes of polishing was 0.049 a.
It was m.

As described above, the abrasive of the present invention exhibited significantly higher polishing ability than the conventional abrasive containing the same amount of abrasive grains.

"Effects of the Invention" As explained above, according to the present invention, since the abrasive grains are captured by the hydrophilic fibrous material and the dispersed state is maintained,
The abrasive grains do not aggregate even after long-term storage, and the hydrophilic fibrous material prevents the abrasive grains from scattering outside the area of high shear force during grinding, keeping them under high shear force. Therefore, grinding work efficiency can be improved. Furthermore, since an aqueous dispersion medium is used, the sharpness of the abrasive grains is good.

Patent Applicant: Daicel Chemical Industries, Ltd. Agent: Makoto Seiryo Patent Attorney: Shigedo Matsui Patent Attorney: Kunio Miura Procedural Amendment (Shima) 6 July 8, 1985 Michibe Uga, Commissioner of the Patent Office
Display of use 1.1 month 1985 patent application No. 98982
2) Name of the invention (abrasive) and 3. Relationship with the case of the person making the amendment Patent applicant
TaMo Representative: Kubo 1) Mi Fumi (1 other person) 114, Agent L\ 1'1, ``In addition,...
I can explain. "The hydrophilic ram-like substance that can be used in the present invention includes not only microphyllized cellulose but also microscopically fibrous materials, such as lint, litter, wood bulbs, etc. , regenerated cellulose, microcrystalline cellose, polyvinyl formal, silk, chitin, tosan, keratin, collagen, cationized cellose, etc. can be used.In addition, lint, phosphorus-1 wood pulp, and regenerated cellulose are made using these materials rather than the raw materials. The one that has been subjected to beating treatment is suitable for the ladle of the present invention.''

that's all

Claims (5)

[Claims] (1) An abrasive comprising abrasive grains and a hydrophilic fibrous substance dispersed in an aqueous dispersion medium. (2) The abrasive according to claim 1, wherein the abrasive grains are diamond powder. (3) The abrasive according to claim 1 or 2, wherein the hydrophilic fibrous material is microfifurylated cellulose. (4) In any one of claims 1 to 3, the abrasive grains are 0.2 to 20% by weight, the hydrophilic fibrous material is 0.04 to 20% by weight, and the remainder is the aqueous An abrasive consisting of a dispersion medium. (5) In any one of claims 1 to 4, the polishing wherein the fiber diameter of the hydrophilic fibrous material is 0.2 to 5 times the average particle diameter of the abrasive grains. agent.