JPH111680A - Gasket material - Google Patents

Abstract

(57) [Summary] [Problem] To provide a gasket material that forms an opening and that can exhibit high sealing performance, soundproofing, vibration-proofing, etc., in a layered manner. . SOLUTION: The gasket material (A) is a rubber sheet (3) in which synthetic rubber (1) and cork particles (2) are kneaded.
Is formed, and a nonwoven fabric (2) is arranged on both sides of the rubber sheet (3) via an adhesive, and then vulcanized, and a cork layer (5) is provided as an intermediate layer, and a nonwoven fabric layer (6) is provided on both sides thereof. To form a rubber layer (7) on both outer surfaces. As a result, a gasket material having sufficient hardness and strength can be obtained and also exhibit good compressibility.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket material which is interposed between two members having an opening and seals the members, and more specifically, has a sealing property, a soundproofing property, a vibrationproofing property and the like. It relates to a gasket material which is excellent.

[0002]

2. Description of the Related Art Conventionally, a gasket material which is mounted between members which need to be hermetically sealed to achieve sealing is made of a synthetic rubber material excellent in compressibility and moldability, or formed by pulverizing the synthetic rubber material to an appropriate particle size. Synthetic rubber material containing cork particles formed by kneading the cork particles is used, but with recent engine weight reduction, high heat and high speed, high compressibility, high strength, heat resistance In order to respond to this demand, acrylic rubber, which is disadvantageous in terms of cost and molding but is excellent in material properties, has been widely used, and is currently the mainstream of gasket materials.

[0003]

However, with the downsizing and higher output of the engine, further improvement in compressibility and strength is desired, and gaskets made of high-performance materials are being studied. Under these circumstances, gasket materials that meet the required performance and are superior in price include silicone rubber, fluorosilicone rubber,
Alternatively, fluorine rubber and the like are known, but silicone rubbers have poor engine oil resistance, and fluorine rubbers have disadvantages such as an extreme increase in cost.

[0004] Further, a blend rubber obtained by blending various kinds of acrylic rubber, silicone rubber, fluorine rubber and the like, and a novel rubber material satisfying the above-mentioned requirements such as heat resistance and low price have not yet been developed. . On the other hand, cork material is used as a gasket material with little lateral flow as a compressible material, but it cannot be applied with a large load because it generates settling, and its strength is weak, so it is necessary to mold a thin plate product Can not. An object of the present invention is to eliminate such disadvantages and to provide a gasket material which is excellent in sealing performance and has excellent soundproofing and vibration-proofing properties.

[0005]

The present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the present invention relates to a gasket material (A) used for a gasket for an internal combustion engine or a gasket for a refrigerator. As shown in 2, a rubber sheet (3) is formed by kneading an unvulcanized synthetic rubber (1) and a cork particle (2) pulverized and refined to a particle size of about 5 to 30 mesh.
A nonwoven fabric (4) made of a natural fiber or a synthetic fiber coated with an adhesive is placed on both sides of the formed rubber sheet (3) and vulcanized under pressure and heating conditions. A cork layer (5) is formed, and a nonwoven fabric layer (6) enclosing a rubber material and small cork particles (2) is formed on both sides thereof, and synthetic rubber (1) is exuded on both outer surfaces thereof. It is characterized in that a rubber layer (7) is formed.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The gasket material (A) of the present invention comprises:
As shown in FIG. 2, a rubber sheet (3) obtained by kneading cork particles (2) into a synthetic rubber (1) and a nonwoven fabric (4) coated with an adhesive compatible with the rubber sheet (3) are overlaid on both sides. Then, they are vulcanized and bonded by a press or the like to form a gasket material (A). During this vulcanization bonding, when the rubber sheet (3) is compressed together with the nonwoven fabric (4), the rubber sheet (3) tends to flow into the side of the low density nonwoven fabric (4). Due to the filter action of the complexly intertwined fibers, the movement and outflow are prevented and remain as it is. On the other hand, a part of the synthetic rubber (1) having excellent permeation / permeation power permeates the nonwoven fabric (4) and exudes to the surface side. Vulcanized and cured. Here, a cork-rich cork layer (5) is formed in the center, and a rubber layer (7) is formed by sandwiching the cork layer from both sides with a nonwoven fabric layer (6). In this vulcanization molding, the vulcanization reaction of the synthetic rubber (1) proceeds, and at the same time, a chemical bond is formed with the adhesive applied to the nonwoven fabric (4) to obtain a strongly integrated gasket material (A). By such an action, a stronger bond is formed.

[0007]

Examples of the synthetic rubber (1) of the gasket material (A) of the present invention include nitrile rubber, acrylic rubber, styrene butadiene rubber, chlorobutadiene rubber, butyl rubber, silicone rubber, and fluorine rubber. Next, as the cork grain (2), natural cork bark was put into a crusher and crushed finely.
It is used after being refined to a particle size of about 30 mesh, and has the characteristics that it is lightweight, has strong elasticity and high compression recovery force, and is excellent in heat insulation, vibration absorption, and sound insulation. I have. In addition, as the nonwoven fabric (4),
Examples thereof include synthetic fibers such as polyester fiber, polyamide fiber, polypropylene fiber, acrylic fiber, and aramid fiber, and glass fiber, ceramic fiber, and carbon fiber. The thickness is about 10 to 200 μm, and the weight is about 20.
１００100 g / m ² , tensile strength about 1-10 kg / c
m ² is used.

The present invention provides a gasket material (A) comprising a rubber sheet (3) obtained by kneading cork particles (2) into a synthetic rubber (1) shown in FIG. 1 and a plurality of nonwoven fabrics (4) coated with an adhesive. When vulcanizing and integrating them, depending on the type of rubber material used, for example, a temperature of 15
If vulcanization molding is carried out under the conditions of 0 ° C. to 250 ° C., a tightening pressure of 0.5 to 40 kg / cm ² , and a pressing and heating time of 1 to 60 minutes, a cork layer which is clearly formed into a layer ( 5) A gasket material (A) comprising the nonwoven fabric layer (6) and the rubber layer (7) is obtained.

In the present invention, as described above, the surface is covered with the rubber layer (7) due to the exudation of the inner synthetic rubber, but the hardness is relatively high due to the connection between the synthetic rubber (1) and the nonwoven fabric (4). It forms a layer with high strength that does not cause cross-flow, and has satisfactory compressibility of the middle cork layer (5),
And, due to the good adhesion of the rubber layer located on the surface side, high sealing performance capable of withstanding severe sealing conditions is exhibited.

The following Table 1 shows a comparison of characteristics between the gasket material of the present invention and a conventional rubber material containing cork particles.

[0011]

According to the present invention, a rubber material is mixed with a cork material to form a multi-layered non-woven fabric (4).
The characteristic of the cork material, which is small in lateral flow at the time of compression, and the good resilience that immediately restores to the basic shape when the compression load of the rubber material is removed, and the nonwoven fabric (4) and the synthetic rubber (1) are entangled. This improves mechanical properties such as tensile strength. With this high mechanical strength, the tightening surface pressure can be increased, and the sealing performance is dramatically improved. In addition, high mechanical strength enables the formation of a thin gasket material.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 A gasket material 1 synthetic rubber 2 cork grain 3 rubber sheet 4 nonwoven fabric 5 cork layer 6 nonwoven fabric layer 7 rubber layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08L 97/00 C08L 97/00 F16J 15/00 F16J 15/00 B // B29K 19:00 105: 08

Claims (1)

[Claims] 1. A rubber sheet is formed by kneading unvulcanized synthetic rubber and cork particles purified to a particle size of about 5 to 30 mesh, and a nonwoven fabric coated with an adhesive is placed on both sides of the formed rubber sheet. Vulcanization molding under pressure and heating conditions, a cork-rich cork layer in the middle layer, a non-woven fabric layer containing rubber material and small-grain cork particles on both sides, and a composite on both outer surfaces A gasket material comprising a rubber layer formed by leaching rubber.