JPS63256367A - Abrasive material - Google Patents

Abstract

PURPOSE:To obtain a high grade sheet like abrasive material with high quality by adhering micro-fiber crystal selected from a specific group on a sheet like base material and forming a polishing surface with the use of the top thereof. CONSTITUTION:Micro-fiber crystal, which is selected from a group of silicon carbide, silicon nitride, potassium titanate, aluminum oxide and zirconium oxide, is adhered on a sheet like base material. The micro-fiber crystal is formed with the top of the micro-fiber crystal. The micro-fiber like crystal is manufactured by an electro-static planting method, wherein static electricity is electrified on the base material on which the micro-fiber crystal is scattered and adhered. In this case, the micro-fiber like crystal is oriented in the piled state with the one top side downward by the polarity thereof as so to be adhered on the based material while holding the piled state.

Description

DETAILED DESCRIPTION OF THE INVENTION (rg: field of application on beams) The present invention relates to an abrasive material, and more particularly to micro-t! A. This invention relates to a sheet suitable for extremely high-precision finishing polishing, in which the polishing surface is formed from the top of m-shaped crystals, and to a polished material.

(Prior art) Conventionally, sheet-like abrasive materials are made by fixing abrasive grains in a thin layer onto a sheet-like base material made of cloth, special paper, etc. with excellent dimensional stability and strength. It has been known. When polishing, it is common to use these polishing cloths or abrasive cloths to manually rub and abrade the surface of the object to be polished. The abrasive grains used in this sheet-like abrasive material are mainly fine powders such as silicon carbide (8iC) and aluminum oxide (Alton), which are fixed onto cloth, paper, or a special film as a base material. . The fixing method is to spread abrasive grains on a thin layer of adhesive resin applied to a base material such as cloth, paper, or film, fix the abrasive grains in a single layer, and then harden the resin. let

Furthermore, as for the base material, cloth or paper can be used as a base material for low-count materials, and metal materials, wood, stone, and plastics can be used for sheet-like abrasive materials manufactured using high-count materials such as 400 or higher. , used for surface grinding and polishing of glass, etc. Once the abrasive grains fixed to the surface fall off, that's the end of its life.

The conventional sheet-like abrasives mentioned above are manufactured by the method described above, so those with relatively low counts can be easily manufactured, but those with high counts can be produced by spreading the abrasive grains uniformly and evenly on the base material. It is difficult to obtain a single layer by spraying, and therefore it is difficult to obtain a good quality product. Moreover, high-count abrasive grains such as 4.0
Even if it is No. 00, its average particle size is 3μ,
If a single layer is formed with this, the surface of action will be extremely limited and it will not be possible to obtain a good quality product. Even higher count io, oo
.

This tendency is even more remarkable if the number corresponds to the number 20,000.

(Problems to be Solved by the Invention) The present inventors have completed the present invention as a result of intensive research in view of the problems that existing sheet-like abrasive materials have. An object of the present invention is to provide a sheet-like abrasive material suitable for precision polishing, in which a polishing surface is formed by the tops of the fibrous crystals.

(Yuan, Ya & Ka91 Tatemetsu Ito) The purpose of the above is to prepare a sheet-like base material with micro-fine crystals selected from the group of silicon carbide, silicon nitride, potassium titanate, aluminum oxide, and zirconium oxide. This is achieved by a polishing material in which the fibrous crystals are fixed to each other and a polishing surface is formed by the tops of the fibrous crystals.

The microfibrous crystals as used in the present invention refer to needle-shaped single crystals, such as ARJ whiskers, grown by high-temperature gas phase reactions. , fine XJA ft1A-like crystals made of zirconium oxide are applied, but silicon carbide, silicon nitride and aluminum oxide are particularly preferred.

These minute yjl & pongee crystals are all commercially available.
Moreover, it can be easily manufactured by a known manufacturing method.

For example, in the case of small fibrous crystals imitating silicon oxide, it is obtained by supplying a silicon component and a carbon component in a gas phase into a high-temperature reaction tube to grow a β-type SIC single crystal.
It has a similar shape, and its diameter and length can be controlled by appropriately selecting reaction conditions.

In addition, as the base material applied to the present invention, any fabric, paper, film, etc. can be used, but a synthetic resin film is preferable because it has excellent surface flatness and flexibility, and has thin and homogeneous physical properties. Furthermore, in consideration of dimensional stability, water resistance, heat resistance, etc., biaxially stretched polyethylene terephthalate films are particularly preferred.

What is important in the present invention is that the fine fibrous crystals are fixed substantially perpendicularly to the surface of the base material, and the tops of the fine fibrous crystals form the polished surface.

The shape of the fine fibrous crystals applied to the present invention varies depending on the type of the object to be polished, the degree of finishing, etc. Generally, the fine fibrous crystals with a length of d and slender have an abrasive grain count (JI8) in the cross-sectional direction.
-6001') approximately 6,000 to 10,000 #
It has properties equivalent to those of an extremely high-count material, and has a length approximately 10 times the cross-sectional diameter. Since the abrasive material according to the present invention uses fine fibrous crystals having an upper grip 'R, it has a longer length and thickness in the vertical direction than an abrasive material to which granular abrasive grains are applied. It is softer to the touch and can be applied to soft objects to be polished such as plastics, and precision finishing of plastics, which was previously difficult, is also possible. It also has the advantage that as it is used, the tips of the microfibrous crystals break off to a small extent, resulting in an extremely long life as an abrasive.

The abrasive material according to the present invention can be manufactured, for example, by the following method.

That is, it is generally referred to as electrostatic flocking method, in which the base material is charged with static electricity, and 5 fine fibrous crystals are scattered and attached thereto, but in this case, the fine fibrous crystals are The brush is oriented in a nape-like manner with one top facing down, and is fixed in this state because it tends to stand up like a brush on the base material.

Fabric, paper, and film can be used as the base material, and there are no particular restrictions, but in reality, since the abrasive grains are fine, there is a problem if the base material surface has many undulations. It is preferable to use a film with excellent flatness. These films have excellent dimensional stability,
It is more preferable to use a film that has excellent flexibility, and specifically, it is particularly preferable to use a biaxially stretched film.

(Effects of the Invention) The abrasive material according to the present invention is different from various conventional coated abrasive papers. That is, while conventional coated abrasive paper has extremely short life because abrasive grains are arranged on the base material, the abrasive material according to the present invention can be expected to have a long life to some extent.

In addition, microfibrous crystals have a small cross-sectional diameter of 10.00
Since it is easy to obtain something equivalent to No. 0, conventionally,
A coated abrasive paper, which has been relatively difficult to obtain, can be easily obtained, and particularly because of its slight silane property, extremely favorable results can be obtained for surface finish polishing of soft objects to be polished such as plastics.

The present invention will be specifically described below with reference to Examples.

(Example) Using SiO whiskers with an average cross-sectional diameter of 1.2μ and an average length of 15μ as an abrasive material, a thin film of thermosetting urethane resin as an adhesive was applied to the surface of a biaxially stretched polyester film.
The fibers were electrostatically flocked onto the base material coated with O, and fixed by heat treatment. (2) The product that was produced had a very densely raised form of 8iC whiskers, and the whiskers were relatively firmly fixed and did not fall off easily.

With this product, Tori μ (polymethyl methacrylate)
As a result of dry hand polishing the surface of the resin flat plate,
A surface close to that of a bell surface was obtained.

Surface roughness measurement result Ra -0,0012Rmay
= 0.015, and no particularly deep streaks were observed.

Furthermore, as a result of similar polishing using the same spot, 8
I made a skewer that can be used twice. After 8 times, the eyes closed and could not be used as an abrasive.

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Claims (3)

[Claims] (1) fixing at least one kind of microfibrous crystals selected from the group of silicon carbide, silicon nitride, potassium titanate, aluminum oxide, and zirconium oxide to a sheet-like base material;
An abrasive material having an abrasive surface formed by the tops of the fibrous crystals. (2) Claim No. 1 in which the microfibrous crystals are made of silicon carbide, silicon nitride, or aluminum oxide.
) The abrasive material described in section 2. (3) The abrasive material according to claim (1) or (2), wherein the sheet-like base material is a biaxially stretched polyethylene terephthalate film.