JPS5817134A - Composite rubber material - Google Patents

Abstract

PURPOSE:To provide an inexpensive composite rubber material suitable as a sealing material for gasket, etc. and having excellent mechanical strength, sealing properties, etc., by dispersing a short synthetic fiber in rubber, shaping the mixture into grains and then agglomerating the grains. CONSTITUTION:5-40% short synthetic fiber 4 such as a polyamide fiber or a polyester fiber is dispersed in rubber in an unvulcanized state. The mixture is shaped into grains 2, for example, by extruding it into a rod by an extruder and then cutting it in grains. The grains 2 are agglomerated, for example, by vulcanization-molding the grains 2 into a sheet, to obtain the desired composite material. At the boundary between two grains 2 bonded to one another in the resulting composite material, a reticulate protrusion 3' is formed by a layer of a high rubber content which has leached out of the grains 2 during vulcanization-molding. An excellent sealing effect can be obtd. by this protrusion when the material is applied as a sealing material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to composite rubber materials, and particularly to materials suitable as sealing materials such as gaskets and packings.

For example, regarding gasket materials, rubber materials such as natural dimm and synthetic rubber have traditionally been used on their own, but they are only applicable in extremely ridged areas (atmospheres). However, recently, various composite materials that combine rubber materials and other materials are being investigated. By the way, one example is a commonly used joined sheet whose surface is coated with a rubber material as an elastic body in a lattice pattern by offset printing or the like to improve sealing performance. However, with such products, there are problems such as peeling of the coating and leakage of the coating.

9. Disadvantage of the pot, which does not provide a high level of sealing performance. Another drawback is that the bonded sheet made of asbestos or the like as a base material adheres to the mating surface, making it impossible to reuse it. Therefore, at present, there is no composite rubber material that is a combination of rubber material and other materials that is suitable for use as a gasket material. In other words, the mechanical strength is stronger than that of rubber alone, there is no plastic deformation, it can be reused, it seals with low clamping surface pressure, and has good sealing performance, especially against gas.
There has not been a composite rubber material that is easy to use, inexpensive, and economical.

The present invention provides a composite rubber material that eliminates the above-mentioned drawbacks.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

No. 1 #A shows a partial perspective view of the composite rubber material according to the present invention in the form of a sheet. and the second
The figure is an enlarged view of the surface of the sheet-shaped composite rubber material shown in FIG. 1.

l is a sheet made of composite rubber ρ, 2 is 1llII~
Grain 3 having a vertical size of about 5 m in diameter is a mesh-like grain boundary. The sheet 1 made of composite rubber has a composition structure in which a large number of grains 2 are aggregated as one piece. The particles 2 are made of rubber 5 in which short fibers 4 made of synthetic resin fibers are dispersed and blended. The means for obtaining 2 tons of these particles is to mix and disperse short fibers 4 in an unvulcanized rubber 5 in a weight ratio of 5 to 40%. The short fibers 4 preferably have a fiber diameter of up to about 50 microns and a fiber length of 0.11a1 to 51al+, and are conveniently blended into the rubber 5 in an unvulcanized state.

Furthermore, the short fibers 4 are preferably made of synthetic resin fiber material, and if other inorganic fibers are used, the composition of the rubber 5 on the left is as follows.
The most preferable materials are aramid fibers (polyamide fibers) and polyester fibers, which have amino groups that easily form ionic bonds with the carboxyl groups of rubber 5. The rubber container may be any synthetic rubber.The particles 2 thus obtained have a diameter of 1
It may be spherical with a radius of 5 to 5 cm, or square with a square of 1W to 5 cm.
It may also be obtained by cutting into rods at appropriate intervals using an extruder.

Particles 2f thus obtained: A large number of particles are collected.

However, in this state, the rubber 5Fi of particle 2 is in an unvulcanized state. And a large number of grains 2 are collected.

It is obtained by vulcanization molding into a desired shape.

In the case of FIG. 1, the material is vulcanized into a sheet.

Then, during vulcanization molding, the joint boundary part of grain 2 is
A mesh-like particle boundary portion 3 is formed by the layer having a high rubber ratio flowing out from inside the particle 2 . 3 shows a cross section of the sheet 1 shown in FIG. 1, and FIG. 4 is a partially enlarged view of FIG. 3. As shown in FIGS. 3 and 4, the mesh-like grain boundary portion 3 is three-dimensionally formed along the outer surface of the grain 2o, and is then formed on the surface of the sheet 1, that is, the molding 111i! A mesh-like raised portion 31 is also formed along the periphery of the grain 2 on the surface.

In the present invention, the mesh-like raised portion 3' formed on the surface exhibits an excellent sealing effect when used as a gasket material, for example. In other words, this mesh-like raised portion 31 allows 411
It's a hand. Grinding (to fill in the grooves and scratches on the surface of flanges, etc.) serves the purpose of maintaining excellent sealing performance.

As detailed above, the composite rubber material according to the present invention is made up of a large number of rubber grains in which short fibers are dispersed and blended together, so there are problems with peeling of rubber and problems with composite rubber. It completely eliminates the internal S permeability of gases and the like, which are easily exposed to gas, and eliminates the need for the various technical line layers mentioned above.

Of course, the present invention particularly prefers P material as a sealing material, but it is not limited thereto, and can be used depending on the purpose of use of the material.

[Brief explanation of the drawing]

The drawings all show embodiments according to the present invention, and the 1st vA
is a partial perspective view of a sheet-shaped composite rubber material, FIG. 2 is an enlarged surface view of FIG. 1, and FIG. 3 is a sectional view of FIG. 1.
FIG. 4 is a one-minute enlarged view of FIG. 3. l... Sheet 2... Grain 3... Grain boundary 3... Raised portion 4. ......Short fiber 5...Rubber Applicant Nippon Biller Industries Co., Ltd.

Claims (1)

[Claims] (1) A composite rubber material made of a large number of grains with a diameter of about 1 m to 5 mm, each of which is a composite made of Go A in which short fibers of synthetic resin fibers are dispersed. rubber material.