JP3101155B2 - Abrasive rubber sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-like abrasive rubber, and more particularly, to a sheet-like abrasive rubber which can be easily applied to an object having a complicated shape and has an excellent service life.

[0002]

2. Description of the Related Art Abrasive materials in finishing processes such as corners of machines and instruments, cavities of molds for molding plastics and rubbers, entire surfaces of plastic models and tools, and inner surfaces of long pipes and the like. Of these, abrasive paper is most often used.

[0003]

In the conventional polishing cloth, when polishing a corner portion of a machine or apparatus, the polishing paper must be folded along the corner portion. If it is continued, it will be cut at that part, and each time you must bend other parts and continue polishing, it is uneconomical, and when polishing inside the cavity of the mold for molding plastics, rubber, etc. If the outer surface is a complicated curved surface, it is hard, so it is difficult to adjust to the curved surface and it is difficult to perform sufficient polishing. Since the surface is more three-dimensional and more complicated than the inside, it is more difficult to grind.When polishing the inner surface of a long pipe, etc., it is done with a grinder with a long handle, but the tip of the Portion corresponding to the grinding grindstone, when mounted, for example, the base portion, has a drawback of such hard paste because of the rigidity. In addition, abrasive cloths and the like also have disadvantages such as poor water resistance, easy removal of particles, and inability to be formed into a three-dimensional product. SUMMARY OF THE INVENTION An object of the present invention is to overcome all the drawbacks of the conventional abrasive paper as described above.

[0004]

According to the present invention, a sample in which fibers are contained in a rubber matrix is subjected to an Akron abrasion tester and subjected to 1,000 rotations at a load of 2.72 kg and a tilt angle of 15-1000.
The fibers protruding from the matrix surface should be made of a fiber that does not bend or deform the fiber tip, and the tensile modulus E [kgf / mm ² ] of the fiber and the diameter d [mm] of the fiber are ≧
1 × 10 ³ and d ≦ 0.1, and the front end of the fiber protrudes from the matrix surface on the sheet surface and is 1 / mm ^2.
It is characterized by a sheet-like abrasive rubber distributed at an average density of × 10 ⁴ / (E · d) or more.

In carrying out the present invention, the fibers include glass fibers, metal fibers, ceramic fibers, aromatic amide fibers, and whisker fibers. The fibers are used as short fibers of at most 5 mm or less, generally 3 mm or less, so that they can be easily mixed with rubber and synthetic resin. If necessary, treatment to improve the adhesion to the matrix rubber or synthetic resin. Is applied.

[0006] as rubber, polyisoprene rubber, natural
Rubber, polybutadiene rubber, styrene butadiene copolymer
Rubber, acrylonitrile butadiene copolymer rubber, butyl
Rubber, ethylene propylene copolymer rubber, polychloroprene
Rubber or the like is used.

When oil is applied to the polished surface as in a machine / apparatus, etc., acrylonitrile-butadiene copolymer
Rubber and polychloroprene rubber are preferred. When polishing a high-heat surface, acrylonitrile-butadiene copolymer rubber or ethylene propylene copolymer rubber is preferred. It is preferable to use butyl rubber and ethylene propylene copolymer rubber so as not to cause cracks.

A thickness of 1 to 30 mm is used. If the thickness is less than 1 mm, the service life is short, and slicing is difficult due to the production method, and if it exceeds 30 mm, complete vulcanization is difficult. Therefore, it is ideally in the range of 1.5 to 25 mm. The hardness is a type A durometer having a hardness of 45 to 85 according to JIS K6253, and if the hardness is less than 45, the service life is short, and if the hardness exceeds 85, the elasticity is lost.
Therefore, it is ideally in the range of 50 to 70 HS (A).

[0009] The tensile modulus of the fiber is glass fiber,
Aramid fiber, etc. is about 10 ³ to 10 ⁴ kgf / mm ² , alumina fiber 10 ⁴ kgf / mm ² units, alumina whisker fiber 10 ⁵
Since the weight is ² kgf / mm and a highly elastic material is used, a sufficient polishing action is exhibited. However, the diameter of the fiber is less than 0.1 mm in order to obtain a fine and smooth polished surface.

The diameter of the fiber has a great influence on the bending stiffness. If the fiber does not bend when sliding against the polished surface, the polished surface is smooth, and if it is hard, the polishing properties are poor. Therefore, the diameter of the fiber is preferably 0.1 mm or less, and although it depends on the polished surface, it is generally 0.1 mm.
The fiber density should be increased to less than 05mm. For fibers having a tensile modulus of 10 ⁴ kgf / mm ^2, the fiber density per 1 mm ² needs to be 1000 or more when the fiber diameter is about 1 μm and 100 or more when the fiber diameter is about 10 μm.

More specifically, the tensile modulus of the fiber E [kgf / mm
² ] and the fiber density in relation to the diameter d [mm] is 1 × 10 ⁴ /
It has been found that a polishing effect is exhibited when the value is equal to or more than the value of (E · d). When two or more kinds of fibers are mixed, the value of Ex is obtained by using a weighted average of the value of Ex for each fiber at a mixing ratio. When the fiber cross section is not circular, the diameter of a circle having an equivalent cross sectional area is defined as d of the fiber.

In the abrasive rubber of the present invention, the fibers protrude from the matrix surface under the above-mentioned conditions, and exhibit an abrasive effect. In order to maintain the polishing effect during use, it is desirable that the permanent deformation of the fiber is not so large. That is, it is necessary to use a fiber that does not deform or break into a state in which the protruding portion bends from the matrix surface of the fiber due to permanent deformation, or the tip is separated, in order to maintain the polishing effect. Tests and determinations are made in an analogous manner to field tests for selecting such fibers.

That is, according to the present invention, a 2 mm thick, 11 mm wide sample adjusted so that the fibers protrude from the surface of the matrix has a diameter of 60 mm having a mounting hole at the center, and a thickness of 12 mm.
A sample was attached to an Akron abrasion tester, wound on a cylindrical portion of an aluminum circular sheet, and attached to an Akron abrasion tester. After rotating 1,000 times at a load of 2.72 kg (6 pounds) and a tilt angle of 15 °, the sample surface was observed with a microscope. Select and use a fiber that does not cause deformation such as bending of the protruding portion of the fiber or loosening of the tip.

[0014]

[Example] Rubber compounding natural rubber 70 parts by weight Styrene butadiene copolymer rubber 30 {Zinc Hua No. 3 5} stearic acid 1} Vulcanization accelerator DM 1 {Vulcanization accelerator TS 0.1} White carbon 40 parts by weight Petroleum softener 5 ５ Antiaging agent D 1 〃 Glass fiber 50 ガ ラ ス

Glass fiber diameter 13 mm Strand length 3 mm Surface treatment agent Acrylic silane Ignition loss 0.7% Tensile strength 150 kgf / mm ² Maximum elongation 4% Tensile strength elastic modulus E 7 × 10 kgf / mm ²

According to the above-mentioned rubber compounding, a sheet-like ground rubber having a thickness of 1.5 mm was prepared by kneading, vulcanizing, slicing, etc., so that the glass fibers were perpendicular to the surface of the rubber matrix. Here, the protruding fiber density by the unit is 16
00. The sheet-like abrasive rubber thus obtained and an abrasive cloth AA1000 as a comparative example were polished 30 times in close contact with a 30 ° acute-angled polypropylene molded article in dry and wet conditions.

Although the sheet-like abrasive rubber of the present invention did not have any folds even when dry and wet, a smooth polished surface was obtained, but the abrasive cloth of the comparative example had folds and was difficult to work. There was not enough polishing work. In the former, the fibers did not come off, but in the latter, the particles came off, especially when wet.

[0018]

[Effect] No break occurs even if polishing is repeated many times, that is, it can be applied to any surface regardless of shape and material, and can be freely attached to complicated surfaces, and obtains smooth polishing. A self-renewable abrasive material was obtained. Also, it was excellent in water resistance and the fiber was hard to come off. Furthermore, although not directly related to the gist of the present invention, it can be easily formed into a self-contained shape as desired.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B24D 11/00 B24D 3/02

Claims (1)

(57) [Claims] 1. A sample in which a fiber is contained in a rubber matrix is applied to an Akron abrasion tester to apply a load of 2.72 kg and a tilt angle.
When the fiber that protrudes from the matrix surface does not bend or deform at the fiber tip when rotated 1000 at 15-, use a fiber that has a tensile modulus of elasticity E (kgf / mm ² ) and a fiber diameter d. [Mm] is ≧ 1 × 10 ³ and d ≦ 0.1, and the tip of the fiber protrudes from the matrix surface on the sheet surface and is distributed at an average density of 1 × 10 ⁴ / (E · d) or more per 1 mm ^2. Abrasive rubber sheet.