JPH05148476A - Heat-resistant and oil-resistant sealing member - Google Patents

Abstract

PURPOSE:To obtain the subject sealing member having excellent heat-resistance, oil-resistance and mechanical strength and useful for gasket, etc., by forming a stick-preventing layer to the joining faces of the main body of the sealing member made of an acrylic rubber and a prescribed counter material. CONSTITUTION:A stick-preventing layer 2 is formed on a prescribed part of a gasket main body 1 constituting the main body of the objective sealing member. The gasket main body 1 is made of an acrylic rubber and the stick- preventing layer 2 is made of a silicone resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat and oil resistant seal member.

[0002]

2. Description of the Related Art NBR (acrylonitrile butadiene rubber) material has been conventionally used for oil filter gaskets known as heat and oil resistant members from the viewpoint of oil resistance. However, the gasket made of NBR material currently used has reached the limit of heat resistance due to the rise of the oil temperature accompanying the performance improvement of the engine in recent years and the rise of the ambient temperature accompanying the change of the oil filter attachment position. .. Therefore, a material having excellent heat resistance and oil resistance, which is an alternative to NBR, has been required.

[0003]

Acrylic rubber can be mentioned as a material excellent in both heat resistance and oil resistance. Silicone rubber is also known as a material with excellent heat resistance, but this silicone rubber is inferior in oil resistance to acrylic rubber and has low mechanical strength, so application of acrylic rubber as an oil filter gasket is expected. To be done.

However, acrylic rubber has the property of easily sticking to metals, especially iron-based materials such as cast iron, at high temperatures of about 100 ° C. or higher. Therefore, when the acrylic rubber is used as a gasket material for an oil filter, the acrylic rubber adheres to the engine block as the mating material,
There is a problem that rubber fragments and the like remain on the engine block surface when the filter is replaced.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat and oil resistant seal member which is excellent in heat resistance and oil resistance and which is prevented from sticking to a mating member.

[0006]

A heat and oil resistant seal member according to the present invention comprises a seal member body made of acrylic rubber and at least a mating member formed on a joint surface between the seal member body and a predetermined mating member. And a sticking prevention layer for preventing sticking of

The shape of the seal member body is not particularly limited. The type of acrylic rubber that constitutes the seal member body is not particularly limited, but, for example, a cryogenic acrylic rubber having excellent low temperature characteristics can be used.

The sticking preventive layer prevents the acrylic rubber constituting the seal member main body from sticking to the surface of the metallic counterpart material, and at least the seal member main body intended to prevent the sticking to the counterpart material. It is formed on the joint surface. The sticking prevention layer preferably has a thickness of 3 to 35 μm. If the thickness of the sticking prevention layer is thinner than 3 μm, the sticking prevention effect is poor, and if it is thicker than 35 μm, the productivity of film formation is reduced. Further, it is preferably 5 to 35 μ. This is because if the thickness of the sticking prevention layer is less than 5 μm, the sticking prevention effect can be obtained, but it may not be said to be sufficient in some cases.

The anti-sticking layer can be formed as a film on the surface of the acrylic rubber that constitutes the main body of the seal member, and is not particularly limited as long as it is a material that does not easily stick to a metal member such as cast iron or aluminum alloy. Alternatively, it can be formed of silicone rubber. The anti-sticking layer made of this silicone resin or silicone rubber is
Apply a solution of silicone resin or silicone rubber to a predetermined part of the seal member body, and apply at a temperature of 100 to 200 ° C for 5
It can be formed by firing for 30 minutes.

The silicone resin may be, for example, of the following composition formula (n, m = 1,
2, 3, ...).

[0011]

[Chemical 1]

[0012]

[Chemical 2]

[0013]

[Chemical 3]

The silicone rubber may be of the following composition formula (n =
1, 2, 3, ...).

[0015]

[Chemical 4]

In the above composition formula, X is silanol, hydrogen, alkoxy, amino, carboxyl, alcohol,
Either epoxy or phenyl.

[0017]

In the heat and oil resistant seal member of the present invention, since the seal member body is made of acrylic rubber, heat resistance,
And excellent oil resistance. Further, since the sticking prevention layer is formed on the joint surface with the predetermined mating member, the seal member main body is prevented from coming into contact with the predetermined mating member, and the seal member main body and the predetermined mating member are fixed to each other. Can be reliably prevented.

[0018]

EXAMPLE An example in which the heat and oil resistant seal member of the present invention is applied to an oil filter gasket will be described below.

Oil filter gasket 1 of this embodiment
Reference numeral 0 denotes a ring-shaped overall shape, and an annular thick seal portion 11 that is compressed and sandwiched between the oil filter and the engine block, and an upper portion (in FIG. 1) on the inner edge side of the seal portion 11 are integrally horizontal. From the gasket body 1 which constitutes the seal member body of the present invention, which comprises the annular thin holding portion 12 extending to the inside, and the sticking prevention layer 2 which continuously covers the entire lower surface of the seal portion 11 and the upper side surface of the seal member 11. It is configured. The holding portion 12 of the gasket body 1 is held by the claw portion of the oil filter, the upper surface side of the gasket body 1 contacts the oil filter, and the sticking prevention layer 2 formed on the lower surface side of the seal portion 11 contacts the engine block. ..

The gasket body 1 is made of a cryogenic acrylic rubber. The sticking prevention layer 2 is made of a silicone resin. The sticking prevention layer 2 was formed as follows. First, the following composition formula (n = 1,
2,3, ...) silicone resin with solvent (toluene)
To prepare a solution in which a silane coupling agent or the like as a reaction catalyst was mixed.

[0021]

[Chemical 5]

By spraying the solution through the nozzle while rotating the gasket body 1, the solution was applied to a predetermined portion of the seal portion 11 of the gasket body 1.
Then, by baking at 175 ° C. for 10 minutes, the silicone resin and the acrylic rubber were caused to undergo a condensation reaction to form a sticking prevention layer 2 having a thickness of 5 μm on a predetermined portion of the seal portion 11 of the gasket body 1.

Since the gasket body 1 of the gasket 10 of this embodiment is made of acrylic rubber, it has excellent heat resistance and oil resistance. Further, since the sticking prevention layer 2 made of silicone resin is formed on the joint surface with the engine block, the acrylic rubber is prevented from coming into contact with the engine block, and the sticking of the acrylic rubber and the engine block is surely prevented. be able to.

Further, in the gasket 10 of this embodiment, the sticking prevention layer 2 is formed only on the joint surface of the gasket body 1 with the engine block, and the sticking prevention layer is not formed on the joint surface with the oil filter. Therefore, the gasket 10 is prevented from being fixed to the engine block and is easily fixed to the oil filter. Therefore, when the oil filter is replaced, the gasket 10 is fixedly held on the oil filter, and the fragments of the acrylic rubber forming the gasket body 1 are not fixed and remain on the engine block.
The gasket 10 can be easily peeled off from the engine block.

Furthermore, since the acrylic rubber forming the gasket body 1 and the silicone resin forming the sticking prevention layer 2 are chemically bonded by a condensation reaction, the gasket body 1 and the sticking prevention layer 2 can be separated from each other. It is prevented. (Evaluation) As shown in FIG. 2, the oil filter 20 to which the gasket 10 for the oil filter of the above embodiment is attached.
Was mounted on the engine block 30 of the vehicle, and the adhesion force between the gasket 10 and the engine block 30 was measured after running the monitor (running distance 20000 to 25000 km). This was done by pulling the gasket 10 only with a spring and measuring the maximum load (g) until the gasket 10 was peeled off from the engine block 30 as a fixing force. This fixing force was measured for nine gaskets having the same structure. The results are shown in Table 1 as sample numbers 1 to 9 of each sample. For comparison,
The adhesion strength was similarly measured for four gaskets of the comparative example formed in the same manner as in the above-mentioned example except that the adhesion prevention layer 2 was not formed. The results are shown in Table 1 with the sample numbers of the samples being 10 to 13.

The gasket 10 is the oil filter 2
Claw portion 21a formed on the bottom surface portion 21 made of iron constituting 0
Is held by. Further, the oil filter 20 is
A central discharge hole 22 screwed into a central cylinder portion 31 on the side of the engine block 30 made of cast iron, a suction port 23 for sucking oil from the engine block 30 side, and a rubber valve member for preventing backflow of oil from the suction port 23. 24 and a filter portion 25 for cleaning oil. The oil cleaned by the filter part 25 is sent to the engine block 30 side through the inside of the central tubular part 31.

[0027]

[Table 1] From the results shown in Table 1, as compared with the gasket of the comparative example in which the anti-sticking layer is not formed, the gasket 10 of the present example in which the anti-sticking layer 2 made of a silicone resin is formed on the joint surface with the engine block 30. It can be seen that the fixing force with the engine block 30 is very small.

Similar results were obtained when the gasket body 1 was made of another acrylic rubber and the sticking prevention layer 2 was made of another silicone resin or silicone rubber. The anti-sticking layer made of silicone resin or silicone rubber has an anti-sticking effect not only on the cast iron mating material as in the above-mentioned embodiment but also on the non-ferrous mating material such as aluminum alloy.

In the above embodiment, the heat and oil resistant seal member of the present invention is applied to the gasket for the oil filter. However, the heat and oil resistant seal member of the present invention is
The present invention can be applied to a site where heat resistance and oil resistance are required, and where inconvenience arises when rubber adheres to a mating material, such as an O-ring used for piping in an engine room requiring maintenance.

[0030]

As described above in detail, the heat and oil resistant seal member of the present invention is excellent in heat resistance and oil resistance because the seal member body is made of acrylic rubber, and also has high mechanical strength. Further, since the sticking prevention layer is formed at a predetermined portion of the seal member main body, sticking to the mating member is reliably prevented.

Therefore, the heat and oil resistant seal member of the present invention is required to have heat resistance and oil resistance, and moreover, it can be reliably applied to a site where inconvenience occurs if rubber adheres to the mating material.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a left half of an oil filter gasket of this embodiment.

FIG. 2 is a partial cross-sectional view showing the relationship between the oil filter gasket of this embodiment, the oil filter, and the engine block.

[Explanation of symbols]

Reference numeral 1 is a gasket main body that forms the main body of the seal member, and 2 is a sticking prevention layer.

Claims (1)

[Claims] 1. A seal member main body made of acrylic rubber, and a sticking prevention layer which is formed at least on a joint surface of the seal member main body with a predetermined mating member to prevent sticking to the mating member. A heat and oil resistant seal member characterized by the following.