JP2002349713A - Seal for refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal for a refrigerator that comprises a rubber molding having appreciable sealing performance, capable of having an appreciable resistance and especially a blister resistance to a chlorofluorocarbon or hydrofluorocarbon refrigerant, and capable of firmly adhering to a metal fitting. SOLUTION: The seal for a refrigerator comprises the rubber molding molded from a rubber composition wherein 10 pts.wt. to 100 pts.wt. of a silane-modified filler are blended with 100 pts.wt. of ethylene propylene rubber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal for a refrigerator which can be used as a seal for preventing refrigerant leakage in the refrigerator.

[0002]

2. Description of the Related Art In refrigerators such as air conditioners and compressors for refrigerators of air conditioners, many refrigerator seals are used as seals for preventing refrigerant leakage. Various types of such refrigerator seals are known. Among them, a vulcanized adhesive is applied to a metal fitting and baked, and an unvulcanized rubber preform is vulcanized and bonded. In addition, a seal in a form manufactured by molding a rubber preform into a rubber molded product is generally known. As the metal fitting, for example, a metal fitting made of a cold-rolled steel sheet and subjected to a chemical conversion treatment is used.

[0003] The rubber molded product in such a refrigerator seal basically has good sealing properties such as excellent hardness, elongation, tensile strength, etc., and small compression set. It is required to have a number of mechanical properties to exhibit. Further, the rubber molded product is required to be less likely to expand due to the refrigerant to be sealed and not to cause blisters and cracks due to contact with the refrigerant. Conventionally, CFC12 (CCl ₂
Although F ₂ ) has been mainly used, destruction of the ozone layer by chlorofluorocarbon has become an environmental problem, and fluorocarbons such as HFC134a (CH ₂ FCF ₃ ), which does not destroy the ozone layer, have been used instead of CFC12. ing. Therefore, a rubber molded product in a refrigerator seal is required to have resistance to a chlorofluorocarbon-based refrigerant such as HFC134a or CFC12.

[0004] Nitrile rubber and hydrogenated nitrile rubber are known as rubber materials used for the above-mentioned refrigerator seals, but problems still remain from the viewpoint of blister resistance. Ethylene-propylene-diene rubber (EPDM) has been studied as a rubber material having relatively good blister resistance, but has poor adhesion to the above-mentioned metal fittings and is still not suitable for use as a rubber molded product for sealing. There's a problem.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide good sealing properties, excellent resistance to CFC-based refrigerants,
In particular, it is an object of the present invention to provide a refrigerator seal provided with a rubber molded product which can have blister resistance and can be firmly bonded to metal fittings.

[0006]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have completed the present invention. The present invention is as follows. (1) A refrigerator seal provided with a rubber molded product obtained by molding a rubber composition containing 10 to 100 parts by weight of a silane-modified filler per 100 parts by weight of ethylene-propylene rubber. (2) The seal for a refrigerator according to the above (1), wherein the silane-modified filler is a silane-modified clay. (3) The seal for a refrigerator according to the above (1) or (2), wherein the silane is at least one of an amino silane, a mercapto silane, and a vinyl silane. (4) The above (1), further comprising a metal fitting which is vulcanized and bonded to the rubber molded product via a vulcanizing adhesive layer.
A seal for a refrigerator according to any one of (1) to (3). (5) The refrigerator seal according to (4), wherein the vulcanized adhesive is a silicone-based vulcanized adhesive. (6) The refrigerator seal according to any one of the above (1) to (5), which is used as a sealing body for preventing leakage of a CFC-based refrigerant.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The seal for refrigerators of the present invention basically includes a rubber molded product obtained by molding an ethylene-propylene rubber containing a predetermined amount of a silane-modified filler. The “ethylene-propylene rubber” in the present invention includes EPM (ethylene-propylene rubber) which is a binary copolymer of ethylene and propylene, and EPDM which is a terpolymer of ethylene, propylene and a diene monomer for crosslinking. (Ethylene-propylene-diene rubber), and mixtures thereof, and other components such as chloroprene rubber, chlorinated polyethylene, butadiene rubber, nitrile rubber, and hydrogenated nitrile rubber within a range that does not impair the properties of the present invention. It shall refer to the mixed mixture. The above-mentioned EPM and EPDM are obtained by ordinary polymerization means, and there is no particular limitation on the means.

When the ethylene-propylene rubber used in the present invention has a diene component, the content of the diene component relative to the whole rubber is not particularly limited,
Those having 15% to 20% by weight are preferred. The diene monomer used is not particularly limited. For example, ethylidene norbornene, dicyclopentadiene,
1,4-hexadiene, methyltetrahydroindene,
5-methylene-2-norbornene, 5- (2-methyl-
2-butenyl) -2-norbornene and the like, among which ethylidene norbornene and dicyclopentadiene are preferred from the viewpoint of the vulcanization rate. As the diene monomer, those described above may be used alone, or two or more of the diene monomers may be used from among those described above.

In the present invention, the rubber molded product is ethylene-
10 parts by weight to 100 parts by weight of propylene rubber
It is obtained by molding a composition containing 100 parts by weight, preferably 20 to 50 parts by weight of a silane-modified filler. When the compounding amount of the silane-modified filler is less than 10 parts by weight based on 100 parts by weight of the ethylene-propylene rubber, the adhesiveness of the rubber molded product to the metal fitting when vulcanizing and bonding with a metal fitting described later is performed. Decrease. If the amount of the silane-modified filler exceeds 100 parts by weight based on 100 parts by weight of the ethylene-propylene rubber, the compression set of the rubber molded product becomes large.

The silane-modified filler used in the present invention refers to a filler obtained by modifying the surface of a filler with a silane coupling agent. Examples of the filler include clay, silica (white carbon), and talc, and are not particularly limited, but clay is preferred from the viewpoint of mechanical properties. Clay is mainly composed of hydrated aluminum silicate, and is generally classified into hard clay and soft clay based on the hardness of the kneaded dough when compounded with rubber and the modulus of the vulcanized product. Hard clay and soft clay cannot make a clear line between them, but in general, hard clay has many small particle diameter parts, 80% or more of particles having a particle diameter of 2 μm or less and 50% of soft clay. It is around. In the present invention, it is particularly preferable to use hard clay among clays from the viewpoint of mechanical properties and adhesiveness.

The silane used in the silane-modified filler of the present invention is not particularly limited, and may be at least one selected from conventionally known amino silanes, mercapto silanes, vinyl silanes, chloro silanes, methacryloxy silanes and the like. However, from the viewpoint that the adhesion between the rubber molded product and the metal fitting via the vulcanized adhesive layer described later, particularly the silicone-based vulcanized adhesive layer, can be further strengthened, amino-based silane, mercapto It is preferable to use at least one selected from a system silane and a vinyl silane. The silane-modified filler of the present invention is an amino-based silane,
It is particularly preferable to be realized by a hard clay modified by at least one of a mercapto silane and a vinyl silane.

The silane-modified filler in the present invention comprises:
Commercially available products, for example, ST-301 (manufactured by Shiraishi Calcium), TRANSLINK-37 (manufactured by Tsuchiya Kaolin Industries), ST-309 (manufactured by Shiraishi Calcium), UR-
T (manufactured by Shiraishi Calcium Co., Ltd.) or the like may be used.

The rubber molded article of the present invention as described above has good compression set, hardness, tensile strength and elongation for exhibiting excellent sealing properties. That is, the rubber molded product of the present invention has a compression set of, for example, about 50% to 200% measured in accordance with the measurement method specified in JIS K 6262, and JIS K 5253.
Hardness measured according to the measurement method specified in 7.
About 5 to 85, the tensile strength measured according to the measuring method specified in JIS K6251 is, for example, 15MP.
a to 20 MPa, elongation measured according to the measurement method specified in JIS K6251 is, for example, 15
It is realized at about 0% to 300%.

The refrigerator seal of the present invention preferably further comprises a metal fitting which is vulcanized and bonded to the above-mentioned rubber molded product via a vulcanizing adhesive layer (hereinafter referred to as a rubber according to the present invention). A structure formed by vulcanizing and bonding a molded product and a metal fitting may be referred to as an “oil seal”.) The oil seal of the present invention is formed, for example, by the following method.

First, the above rubber composition is prepared by kneading using a kneading machine such as an intermix, a kneader, a Banbury mixer or an open roll. After the preparation, a rubber preform is formed by using a device such as an extruder, an open roll, a preformer or the like, which is generally widely used in this field, to obtain a rubber preform. The shape and size of the rubber preform are appropriately selected according to the purpose.

The obtained rubber preform is vulcanized and bonded to metal fittings using a vulcanizing adhesive. The metal fittings are not particularly limited as long as they are commonly used.For example, a cold-rolled steel sheet, a mild steel sheet, or an aluminum sheet is appropriately processed into a shape and size according to the purpose using a metal press or the like. A metal fitting that has been subjected to a surface treatment by, for example, a chemical conversion coating treatment is used. The chemical conversion film treatment is not particularly limited, and is, for example, a zinc phosphate-based film treatment, a zinc calcium phosphate-based film treatment, a manganese phosphate-based film treatment commonly used in the art.
Phosphate film treatment such as iron phosphate film treatment can be mentioned, and among them, zinc phosphate film treatment or zinc calcium phosphate film treatment is particularly preferable.

Examples of the vulcanized adhesive include a silicone vulcanized adhesive, a phenolic vulcanized adhesive, a chlorinated polymer vulcanized adhesive and the like, and are not particularly limited. It is particularly preferable to use a silicone-based vulcanizing adhesive from the viewpoint of more strongly vulcanizing and bonding.

The silicone-based vulcanizing adhesive used in the present invention may be a heat-curing type silicone-based adhesive which is vulcanized by heating, or may be a room temperature vulcanized by mixing a curing agent or vulcanizing with air moisture. It may be in a form (also referred to as RTV silicone or the like), and conventionally known various ones can be suitably used. For example, an oligomer obtained by reacting a silane coupling agent and having an amino group as a functional group, An adhesive having a vinyl group or the like is preferably used.

The vulcanized adhesive is, for example, applied and baked on a chemical conversion film of metal fittings. The application and baking of the vulcanized adhesive is carried out by using a device usually widely used in the art, the application is carried out by dipping in a dipping bath or by using a spray, and the baking is carried out by using an oven. Done. Thus, a vulcanized adhesive layer is formed on the surface of the metal fitting in a semi-cured state.

[0020] The metal fitting and the rubber preform are vulcanized and bonded via a silicone-based vulcanizing adhesive layer, and the rubber preform is formed into a rubber molded product. Can be obtained. Vulcanization is performed using an injection molding machine, compression molding machine, vulcanizing press, etc.
It is performed by heating at 5 ° C to 215 ° C for 1 minute to 20 minutes. Further, secondary vulcanization may be performed if necessary. The secondary vulcanization is performed by heating at 165 ° C. to 215 ° C. for 0.2 hours to 2 hours using an injection molding machine, a compression molding machine, a vulcanizing press or the like. The oil seal manufactured through such secondary vulcanization has more improved blister resistance of the rubber molded product than the oil seal manufactured without secondary vulcanization. The oil seal of the present invention may not necessarily be formed through secondary vulcanization, but is preferably formed through secondary vulcanization.

The oil seal of the present invention obtained as described above is different from a conventional oil seal using a rubber composition containing no silane-modified filler in that the rubber molded product and the silicone-based vulcanizing adhesive are used. The adhesion between the layers is stronger. In such an oil seal, peeling of the interface between the rubber molded product and the adhesive layer by the chlorofluorocarbon-based refrigerant, which will be described later, is unlikely to occur, and therefore, peeling between the rubber molded product and the metal fitting and generation of blisters of the rubber molded product occur. In addition, destruction of the rubber molded product can be reliably prevented.

Further, conventionally, a phenol resin-based adhesive has been generally used for vulcanization bonding between a metal fitting and a rubber molded product, but an adhesive layer using the phenol resin-based adhesive slides with a mating member. In some cases, swarf is generated from the adhesive layer, and the swarf of the adhesive layer is mixed into the object to be sealed. In the oil seal of a particularly preferred embodiment of the present invention, in which a metal fitting and a rubber molded product are vulcanized and bonded via a silicone-based vulcanized adhesive layer, even if the adhesive layer slides with a mating member, There is also an advantage that chips are not generated.

The oil seal of the present invention is used in a refrigerator.
Oil seal used for sealing fluid
Suitable sealing objects that can be sealed by
System refrigerant. Freon of the oil seal of the present invention
As one of the usage examples of sealing the system refrigerant, for example,
Compressor for refrigerators using chlorofluorocarbon refrigerant as refrigerant
The use as a sealing body for preventing refrigerant leakage in
No. In the present specification, “CFC-based refrigerant”
Is, for example, HFC134a (hydrofluorocarbon
, CH_TwoFCF_Three), HFC32 (CH_TwoF_Two), HFC
125 (CHF _TwoCF_Three), HFC143a (C_TwoH
_ThreeF_Three) And other hydrocarbons and mixtures thereof,
And CFC12 (CCl_TwoF_Two) Etc.
Shall refer to quality. The above “refrigerator” is an air conditioner
It shall include the conditioner machine.

The rubber molded product in the oil seal of the present invention has excellent hardness, tensile strength and elongation as described above,
It has small compression set and good sealing properties. The rubber molded product is less likely to generate blisters and cracks even when it comes into contact with a CFC-based refrigerant, and furthermore, a CFC-based refrigerant which is a refrigerant and a polyalkylene glycol which is a refrigerating machine oil commonly used in a refrigerator compressor. Excellent resistance to mixtures with. Further, compared with the case where the rubber molded product does not contain a silane-modified filler, the adhesion between the rubber molded product and the vulcanized adhesive layer, particularly the silicone-based vulcanized adhesive layer, is stronger. The peeling of the bonding interface is unlikely to occur.

Further, the refrigerator seal of the present invention may be composed of only the above rubber molded product (hereinafter, referred to as the rubber molded product).
In the present invention, a structure composed of only a rubber molded product may be referred to as a “sealant”. ). In the case of forming a sealing material, the above rubber composition is kneaded using a kneader such as a conventionally known intermix, kneader, or Banbury mixer or an open roll, and then an injection molding machine, a compression molding machine, and an extruder. It can be obtained by molding into a desired shape using a molding machine or the like. The shape of the sealing material is not particularly limited, and may be appropriately selected depending on the purpose, such as an O-ring, a packing, and a lip seal (shaft seal). Also, the size of the sealing material is not particularly limited, and is appropriately selected according to the purpose.
It is preferable to perform vulcanization on a rubber molded product as a sealing material, and the vulcanization is performed, for example, at 170 ° C. to 200 ° C. for 3 minutes to
It is preferable that the primary vulcanization is performed for 15 minutes, and then the secondary vulcanization is performed at 160 to 200 ° C. for 0.5 to 1.5 hours.

The sealing material of the present invention has the same effect as that of the rubber molded product of the oil seal described above, except for the effect of strengthening the adhesion. Such a sealing material is not particularly limited as an object to be sealed as in the case of the above-described oil seal, but can be suitably used as a sealing body for preventing leakage of a CFC-based refrigerant in a refrigerator compressor.

The rubber composition of the present invention contains preferably 10 to 100 parts by weight, more preferably 20 to 50 parts by weight, of carbon black based on 100 parts by weight of the ethylene-propylene rubber. You. If the compounding amount of the carbon black is less than 10 parts by weight based on 100 parts by weight of the ethylene-propylene rubber, it is not preferable because the sealing function tends to be poor due to too soft. If the compounding amount of the carbon black exceeds 150 parts by weight based on 100 parts by weight of the ethylene-propylene rubber, the compression set tends to increase, which is not preferable.

The carbon black is not particularly limited as long as it is generally used for rubber. Examples of carbon black include HAF carbon black, M
AF carbon black, FEF carbon black, SR
Furnace black, such as F carbon black and GPF carbon black, and thermal black, such as FT carbon black and MT carbon black. These carbon blacks are used alone or in combination of two or more. Among them, furnace blacks such as SRF carbon black, FEF carbon black and GPF carbon black are used from the viewpoint of abrasion resistance and workability. Is preferred.

In the rubber composition of the present invention, preferably 1 to 100 parts by weight of the ethylene-propylene rubber is used.
The organic peroxide is blended in an amount of 10 to 10 parts by weight, more preferably 2 to 8 parts by weight. When the compounding amount of the organic peroxide is less than 1 part by weight, for example, the sealing material using the rubber composition has low mechanical strength such as large compression set, low tensile strength, and large elongation. There is a problem that passes. Also, ethylene-propylene rubber 10
It is meaningless to blend the organic peroxide in an amount exceeding 10 parts by weight with respect to 0 parts by weight, because the effect is not seen.

The organic peroxide used in the present invention can be used without any particular limitation as long as it is generally used as a crosslinking agent in rubber. Examples of the organic peroxide include o-methylbenzoyl peroxide, bis (3,5,5-trimethylhexanoyl) peroxide, lauroyl peroxide, benzoyl peroxide, t-butylperoxypivalate, and t-butylperoxypivalate. Butylperoxy-2-ethylhexanoate, t-butylperoxyisobutyrate, dicumyl peroxide, 1,3-bis (t-butylperoxyisopropyl) benzene, 2,5-dimethyl-2,5- Di (t-butylperoxy) hexane, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3,
Di-t-butyl peroxide and the like.

The rubber composition of the present invention may optionally contain, if necessary, conventionally known crosslinking aids, antioxidants, lubricants and the like. Examples of the crosslinking aid include a conventionally known maleimide-based crosslinking aid, sulfur, liquid polybutadiene,
An allyl-based crosslinking assistant, a methacrylate-based crosslinking assistant, and the like can be suitably used. Examples of the maleimide-based crosslinking aid include N, N-m-phenylenedimaleimide, and examples of the allyl-based crosslinking aid include triallyl cyanurate, diallyl phthalate, and tetraallyloxyethane. Can be Examples of the methacrylate-based crosslinking aid include, for example, ethylene glycol methacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, and trimethylolpropene trimethacrylate. If necessary, the crosslinking aid is used alone or in combination of two or more of the above, and is usually added in an amount of 0.5 to 5 parts by weight based on 100 parts by weight of the ethylene-propylene rubber.

As the anti-aging agent, for example, 2,2,4
Amine-ketone antioxidants such as -trimethyl-1,2-dihydroquinoline polymer, 4,4 '-(α, α-dimethylbenzyl) diphenylamine, N, N'-di-2
-Aromatic secondary amine antioxidants such as naphthyl-p-phenylenediamine; monophenol antioxidants such as 2,6-di-tert-butyl-4-methylphenol; zinc of 2-mercaptobenzimidazole Salt, 2
-Benzimidazole antioxidants such as mercaptobenzimidazole. These antioxidants are used alone or in combination of two or more of the above. Usually, 0.5 to 5 parts by weight is blended with respect to 100 parts by weight of the ethylene-propylene rubber.

As the lubricant, for example, conventionally known lubricants such as paraffin and hydrocarbon resin-based, fatty acid-based, fatty acid amide-based, fatty acid ester-based, and fatty alcohol-based lubricants are suitably used. Examples of the paraffin and hydrocarbon resin system include paraffin wax, microcrystalline wax, liquid paraffin, paraffin-based synthetic wax, polyethylene wax, composite wax, montan wax, and the like. Examples of fatty acids include stearic acid, hardened oil, hydroxystearic acid, and the like. Examples of fatty acid amides include stearoamide, oxystearoamide, oleylamide, laurylamide, behenamide, stearyl oleylamide, and the like. Examples of the fatty acid ester include n-butyl stearate, polyhydric alcohol fatty acid ester, saturated fatty acid ester, and ester-based synthetic wax. Examples of fatty alcohols include higher alcohols and higher alcohol esters. The lubricant may not necessarily be blended, but when blended, is used alone or in combination of two or more of the above, and is usually 0.1 to 100 parts by weight of ethylene-propylene rubber. Parts by weight to 1
It is blended by weight.

In addition, the refrigerator seal of the present invention may be used for sealing a carbon dioxide refrigerant, which has recently been studied as a refrigerant that can be substituted for a CFC-based refrigerant in a compressor of a refrigerator from the viewpoint of environmental problems. Good.

[0035]

The present invention will be described in detail with reference to the following examples, but the present invention is not limited to the following examples. Example 1 A hard clay (ST-301, manufactured by Shiraishi Calcium Co., Ltd.) containing an ethylene-propylene rubber EPDM (ethylidene norbornene (diene) content: 17% by weight) and an amino-based silane as a silane-modified filler. A rubber composition was prepared by using FEF carbon black as the carbon black and kneading with an open roll at the following compounding ratio. (Blending ratio of rubber composition) Ethylene-propylene rubber 100 parts by weight Silane modified filler 30 parts by weight Carbon black 40 parts by weight Organic peroxide 6 parts by weight The organic peroxide is 2,5-dimethyl- 2,5
-Di (t-butylperoxy) hexane was used. This rubber composition was preformed into a shape close to a rubber molded product without vulcanization. An adhesive is applied and baked to a metal fitting made of a zinc phosphate coating on an aluminum plate, and each of the rubber preforms is brought into contact with the metal to cure by vulcanization and bonded in a mold at 175 ° C.
After compression molding for one minute, a sample of a refrigerator seal (oil seal) including a rubber molded product was produced. As the adhesive, a silicone-based vulcanizing adhesive (Chemrock AP133,
Road Far East Co.) was used.

Example 2 A sample of a refrigerator seal was prepared in the same manner as in Example 1 except that the amount of the silane-modified filler was 20 parts by weight and the amount of the carbon black was 50 parts by weight.

Example 3 A sample of a seal for a refrigerator was prepared in the same manner as in Example 1, except that the amount of the silane-modified filler was 20 parts by weight and the amount of the carbon black was 50 parts by weight.

Example 4 A sample of a refrigerator seal was prepared in the same manner as in Example 1 except that a hard clay containing mercaptosilane (ST-309, manufactured by Shiraishi Calcium Co.) was used as a silane-modified filler. did.

Comparative Example 1 A refrigerator seal sample was prepared in the same manner as in Example 1, except that the amount of the silane-modified filler was 5 parts by weight and the amount of the carbon black was 5 parts by weight.

Comparative Example 2 Example 1 was repeated except that the amount of the silane-modified filler was changed to 105 parts by weight and the amount of the carbon black was changed to 105 parts by weight.
A sample of a refrigerator seal was prepared in the same manner as described above.

Comparative Example 3 A refrigerator was used in the same manner as in Example 1 except that a non-silane-modified clay (ST-KE, manufactured by Shiraishi Calcium Co., Ltd.) was used instead of the silane-modified filler. A seal sample was prepared.

Comparative Example 4 A refrigerator seal sample was prepared in the same manner as in Example 1 except that hydrogenated nitrile rubber (HNBR) was used as the rubber material instead of EPDM.

Performance Test 1 (Adhesion) For each of the oil seal samples obtained in Examples 1 to 4 and Comparative Examples 1 to 4, the rubber molded part was peeled off with pliers, and the peeled surface was used for an oil seal. It was investigated whether the surface of the bracket was exposed.も の indicates that the metal surface was not exposed, and x indicates that the metal surface was exposed.

Performance Test 2 (Blister Resistance) Each sample of the oil seals obtained in Examples 1 to 4 and Comparative Examples 1 to 4 was subjected to a CFC-based refrigerant (CFC 134).
Blister resistance to a) was observed. Each sample was immersed in each of the above refrigerants in a sealed container and allowed to stand at 25 ° C. for 70 hours. Then, each sample was taken out and allowed to stand at 150 ° C. for 1 hour. The rubber molded product was evaluated as "O" when there was no crack, and as "X" when the rubber product was cracked.

Performance Test 3 (Permanent Compression Set) Each of the rubber compositions used in Examples 1 to 4 and Comparative Examples 1 to 4 was molded and vulcanized to give a rubber molded product (sealant).
Of each sample was obtained. JIS K for each sample
According to a measuring method in accordance with 6262, compression was performed at a compression rate of 25% in an environment of 150 ° C. for 70 hours, and compression set was measured. A sample having a compression set of 20% or less was evaluated as ○, and a sample having a compression set exceeding 20% was evaluated as ×.

Performance Test 4 (Hardness) For each sample of the rubber molded product obtained in the same manner as in Performance Test 3, the hardness was measured using a type A durometer according to a measuring method in accordance with JIS K5253. When the hardness was within 80 ± 5, the result was ○, and when the hardness was outside 80 ± 5, the result was ×. Table 1 shows the results of performance tests 1 to 4.
Shown in

[0047]

[Table 1]

[0048]

As is apparent from the above description, according to the present invention, it is possible to have good sealing properties, excellent resistance to Freon-based refrigerants, in particular, blister resistance, and to have a strong connection with metal fittings. The present invention can provide a seal for a refrigerator including a rubber molded product that can be adhered to a refrigerator.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Nobuo Keigami 663 Minoshima, Arita City, Wakayama Prefecture F-term in Mishima Works, Mitsubishi Cable Industries, Ltd. AH17 CA07 CB02 CD03 4J002 BB151 DJ036 FB096 FB106 FB146 FB156 FD016 GJ02

Claims (6)

[Claims] 1. A refrigerator seal comprising a rubber molded product obtained by molding a rubber composition containing 10 to 100 parts by weight of a silane-modified filler per 100 parts by weight of an ethylene-propylene rubber. 2. The refrigerator seal according to claim 1, wherein the silane-modified filler is a silane-modified clay. 3. The seal for a refrigerator according to claim 1, wherein the silane is at least one of an amino silane, a mercapto silane, and a vinyl silane. 4. The seal for a refrigerator according to claim 1, further comprising a metal fitting which is vulcanized and bonded to said rubber molded product via a vulcanizing adhesive layer. 5. The seal for a refrigerator according to claim 4, wherein the vulcanized adhesive is a silicone-based vulcanized adhesive. 6. The seal for a refrigerator according to claim 1, which is used as a sealing body for preventing leakage of a CFC-based refrigerant.