JPH10199771A - Electronic part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To raise the sealing property of an elastic sealer by equipping an electronic part with a bottomed cylindrical metallic case for accommodating the part element impregnated with an electrolyte for drive, and an elastic sealer for sealing the opening of this metallic case, and mixing an unsaturated compound as an elastic sealer and vulcanizing it. SOLUTION: A capacitor element 11 is impregnated with an electrolyte for drive, and besides this capacitor element 11 is accommodated in the metallic case 12 consisting of bottom cylindrical aluminum. An elastic sealer 13 is arranged in the opening of the metallic case 12, and a pair of lead wires 14 drawn out of the capacitor element 11 are drawn out through the through hole of the elastic sealer 13. Then, after arrangement of the elastic sealer 13 in the opening of the metallic case 12, the opening of the metallic case 12 is bent inward to press the elastic sealer 13, and the side of the metallic case 12 is plastically transformed, and the elastic sealer 13 is plugged to the metallic case 12. The elastic sealer 13 is one which has butyl rubber for its main component, and this butyl rubber is vulcanized with a peroxide or a resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component used for various electronic devices.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional aluminum electrolytic capacitor has an anode foil made of an aluminum foil having an anodic oxide film formed on its surface and a cathode foil for current collection with a separator paper interposed therebetween. A driving electrolytic solution is impregnated into the capacitor element 1 formed by winding, and the capacitor element 1 impregnated with the driving electrolytic solution is housed in a metal case 2 made of aluminum having a bottomed cylindrical shape. The pair of lead wires 3 drawn out of the capacitor element 1 is passed through the through hole of the elastic sealing body 4 to draw the lead wire 3 out, and then the opening of the metal case 2 is bent inward to press the elastic sealing body 4. The elastic sealing body 4 is sealed to the metal case 2 by plastically deforming the side surface of the metal case 2.

As a conventional driving electrolyte, an electrolyte using ethylene glycol as a main solvent and an ammonium salt of an organic acid as an electrolyte component is widely used.
Further, as the elastic sealing member 4, styrene-butadiene rubber,
Ethylene propylene rubber has been used.

In recent years, reliability in a wide temperature range has been required, and γ-butyrolactone has been used as a solvent for an electrolytic solution. However, in the conventional ammonium salt of an organic acid, which is an electrolyte component, a quaternary ammonium salt of an organic acid is generally used because the electric conductivity of the electrolytic solution is low. In addition, the so-called butyl rubber such as isobutylene / isoprene rubber having high airtightness has come to be used for the elastic sealing body 4 by changing these electrolytes.

[0005]

The vulcanization methods for butyl rubber include sulfur vulcanization, quinoid vulcanization, resin vulcanization and peroxide vulcanization.

An aluminum electrolytic capacitor is manufactured by combining the elastic sealing member 4 made of butyl rubber having excellent airtightness and a driving electrolyte solution using a quaternary ammonium salt of an organic acid as an electrolyte, and has a life at high temperature. When a test or a life test under high-temperature and high-humidity conditions is performed, it has been found that the sealing property of the elastic sealing body 4 is deteriorated.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a highly reliable electronic component in which an elastic sealing member has excellent sealing properties.

[0008]

In order to achieve the above object, an electronic component according to the present invention comprises a bottomed cylindrical metal case for housing a component element impregnated with a driving electrolyte, and an opening in the metal case. And an elastic sealing body for sealing the portion, wherein the elastic sealing body is formed by compounding an unsaturated compound and vulcanizing the resin. According to this configuration, the sealing property of the elastic sealing body is excellent. It is possible to provide a reliable electronic component.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a metal case having a bottomed cylindrical shape for accommodating a component element impregnated with a driving electrolyte and an opening of the metal case are hermetically sealed. An elastic sealing body, wherein the elastic sealing body is formed by compounding and vulcanizing an unsaturated compound. According to this structure, the sealing property of the elastic sealing body can be improved by compounding the unsaturated compound. Therefore, a highly reliable electronic component can be obtained.

According to a second aspect of the present invention, butyl rubber is used as a main component of the elastic sealing body.

According to a third aspect of the present invention, the unsaturated compound is added in an amount of 0.5 part by weight or more based on 100 parts by weight of the butyl rubber as a main component. If the amount is 0.5 parts by weight or more, a good sealing property of the elastic sealing body can be obtained.

According to a fourth aspect of the present invention, butyl rubber, which is a main component of the elastic sealing member, is vulcanized with a peroxide or a resin. The sealability is further improved as compared with those vulcanized with sulfur.

Hereinafter, embodiments of the present invention will be described. FIG. 1 is a sectional view of an aluminum electrolytic capacitor showing an embodiment of the present invention. In FIG. 1, reference numeral 11 denotes a capacitor element, and the capacitor element 11 is an anode foil made of an aluminum foil having an anodic oxide film formed on the surface. And a cathode foil for current collection wound with a separator paper interposed therebetween. The capacitor element 11 is impregnated with a driving electrolyte, and the capacitor element 11 is housed in a metal case 12 made of aluminum having a bottomed cylindrical shape.

Reference numeral 13 denotes an elastic sealing member provided at an opening of the metal case 12. A pair of lead wires 14 drawn from the capacitor element 11 is drawn out to the outside through a through hole provided in the elastic sealing member 13. I have. After disposing the elastic sealing body 13 in the opening of the metal case 12, the opening of the metal case 12 is bent inward to form the elastic sealing body 1.
3 is pressed and the side surface of the metal case 12 is plastically deformed to seal the elastic sealing body 13 to the metal case 12.

The elastic sealing body 13 contains butyl rubber as a main component, and the butyl rubber is vulcanized with a peroxide or a resin.

The peroxide-cured butyl rubber preferably contains an additive selected from the group consisting of a vulcanizing agent, carbon black, a filler and a metal oxide.

Examples of the vulcanizing agent include benzoyl peroxide, dicumyl peroxide, and 2,5-dimethyl-
2,5 bis (t-butylperoxy) hexane and the like, and this vulcanizing agent is mixed with 0.5 to 10 parts by weight with respect to 100 parts of butyl rubber, and 0 to 100 parts by weight of carbon black is preferable. Is 0 to 60 parts by weight, a filler is 0 to 200 parts by weight, preferably 0 to 150 parts by weight,
It is characterized in that a rubber composition containing at least 0.5 part by weight of an unsaturated compound is vulcanized.

The rubber composition described above may contain a crosslinking assistant, a softener, an antioxidant and the like.

The resin vulcanized butyl rubber preferably contains an additive selected from the group consisting of a vulcanizing agent, carbon black, a filler and a vulcanizing activator.

Examples of the vulcanizing agent include alkylphenol formaldehyde resins, and 0.5 to 20 parts by weight of the vulcanizing agent is mixed with 100 parts by weight of butyl rubber. Preferably 0 to 60 parts by weight, the filler is 0 to 200 parts by weight,
Preferably, a rubber composition containing 0 to 150 parts by weight and an unsaturated compound in an amount of 0.5 part by weight or more is vulcanized and molded.

The rubber composition described above may contain a crosslinking aid, a softener, an antioxidant and the like.

In the embodiment of the present invention, polybutadiene and butyl acrylate are used as the unsaturated compound. However, if the amount of the unsaturated compound is 0.5 parts by weight or more with respect to 100 parts of butyl rubber, other compounds are used. (Unsaturated polymers such as styrene butadiene, isoprene, acrylonitrile butadiene, and ethylene propylene terpolymer, unsaturated monomers such as divinylbenzene and styrene, and compounds having a vinyl group). Further, in the embodiment of the present invention, butyl rubber such as isobutylene and isoprene is used as a main component of the elastic sealing body 13, but other fluorine-based rubber, ethylene propylene rubber, styrene butadiene rubber, acrylic rubber, urethane rubber, Any of natural rubber and thermoplastic elastomer may be used as a main component of the elastic sealing body 13.

Next, specific embodiments of the present invention and comparative examples will be described. Hereinafter, "part" indicates "part by weight".

Comparative Example 1 Isobutylene, isoprene,
100 parts polycerbutyl XL-10000 (trade name: Bayer) as a three-component copolymer of divinylbenzene, 100 parts clay as filler, 50 parts carbon black, 0.5 part stearic acid as a processing aid, vulcanization 0.5 parts of magnesium oxide was kneaded with two rolls as an auxiliary agent, and then dicumyl peroxide was added as a vulcanizing agent.
Then, vulcanization molding was performed by a heating press to prepare a peroxide-vulcanized butyl rubber.

(Comparative Example 2) JSR regular butyl 268 (trade name: isobutylene / isoprene copolymer)
100 parts of clay, 100 parts of carbon black, 50 parts of carbon black, 0.5 part of stearic acid as a processing aid, and 5 parts of zinc oxide as a vulcanization aid are kneaded with 100 parts of 100 parts by two rolls. Thereafter, 10 parts of an alkylphenol formaldehyde resin was added as a vulcanizing agent, and vulcanization molding was performed by a hot press to produce a resin vulcanized butyl rubber.

(Embodiment 1) As a ternary copolymer of isobutylene, isoprene and divinylbenzene, polytherbutyl XL-10000 (trade name: Bayer) 100
100 parts of clay, 50 parts of carbon black, 0.5 part of stearic acid as a processing aid,
0.5 parts of magnesium oxide as a vulcanization aid and 0.5 parts of syndiotactic 1,2-polybutadiene (Nippon Synthetic Rubber Co., Ltd.) as an unsaturated compound are kneaded with two rolls, and then dicumyl is used as a vulcanizing agent. Two parts of peroxide were added and vulcanization molding was performed by a heat press to prepare a peroxide-vulcanized butyl rubber.

(Embodiment 2) As a ternary copolymer of isobutylene, isoprene and divinylbenzene, polytherbutyl XL-10000 (trade name: Bayer) 100
100 parts of clay, 50 parts of carbon black, 0.5 part of stearic acid as a processing aid,
0.5 parts of magnesium oxide as a vulcanization aid and 5 parts of syndiotactic 1,2-polybutadiene (Nippon Synthetic Rubber Co., Ltd.) as an unsaturated compound are kneaded with two rolls,
Thereafter, 2 parts of dicumyl peroxide was added as a vulcanizing agent, and the mixture was vulcanized and molded by a hot press to prepare a peroxide-vulcanized butyl rubber.

(Embodiment 3) 100 parts of clay, 50 parts of carbon black as a filler, and 100 parts of JSR regular butyl 268 (trade name: Nippon Synthetic Rubber Co., Ltd.) as an isobutylene / isoprene copolymer 0.5 parts of stearic acid, 5 parts of zinc oxide as a vulcanization aid, and syndiotactic 1, as an unsaturated compound.
0.5 parts of 2-polybutadiene (Nippon Synthetic Rubber Co., Ltd.) is kneaded with two rolls, and then 10 parts of an alkylphenol formaldehyde resin (Sumitomo Chemical Co., Ltd.) is added as a vulcanizing agent, and vulcanization molding is performed with a hot press. Resin vulcanized butyl rubber was produced.

(Embodiment 4) 100 parts of JSR Regular Butyl 268 (trade name: Nippon Synthetic Rubber Co., Ltd.) as a copolymer of isobutylene and isoprene, 100 parts of clay as filler, 50 parts of carbon black, and processing aid 0.5 parts of stearic acid, 5 parts of zinc oxide as a vulcanization aid, and syndiotactic 1, as an unsaturated compound.
2 parts of 2-polybutadiene (Nippon Synthetic Rubber Co., Ltd.)
Knead with this roll, and then add 10 parts of alkylphenol formaldehyde resin (Sumitomo Chemical Co., Ltd.) as a vulcanizing agent.
Then, vulcanization molding was performed by a heating press to prepare a resin vulcanized butyl rubber.

(Embodiment 5) As a three-component copolymer of isobutylene, isoprene and divinylbenzene, polytherbutyl XL-10000 (trade name: Bayer) 100
100 parts of clay, 50 parts of carbon black, 0.5 part of stearic acid as a processing aid,
0.5 parts of magnesium oxide as a vulcanization aid and 0.5 parts of butyl acrylate as an unsaturated compound are kneaded with two rolls, and then 2 parts of dicumyl peroxide is added as a vulcanizing agent and vulcanized by a heating press. Molding was performed to produce a peroxide-cured butyl rubber.

(Embodiment 6) As a ternary copolymer of isobutylene, isoprene and divinylbenzene, polytherbutyl XL-10000 (trade name: Bayer) 100
100 parts of clay, 50 parts of carbon black, 0.5 part of stearic acid as a processing aid,
0.5 parts of magnesium oxide as a vulcanization aid and 5 parts of butyl acrylate as an unsaturated compound are kneaded with two rolls,
Thereafter, 2 parts of dicumyl peroxide was added as a vulcanizing agent, and the mixture was vulcanized and molded by a hot press to prepare a peroxide-vulcanized butyl rubber.

(Embodiment 7) 100 parts of clay, 50 parts of carbon black and 50 parts of processing aid as a filler with respect to 100 parts of JSR regular butyl 268 (trade name: Nippon Synthetic Rubber Co., Ltd.) as an isobutylene / isoprene copolymer 0.5 parts of stearic acid, 5 parts of zinc oxide as a vulcanization aid, 0.5 parts of butyl acrylate as an unsaturated compound
Part is kneaded with two rolls, and then alkylphenol formaldehyde resin (Sumitomo Chemical Co., Ltd.) as a vulcanizing agent
Was added and vulcanization-molded by a hot press to prepare a resin-vulcanized butyl rubber.

(Embodiment 8) 100 parts of clay, 50 parts of carbon black as filler and 100 parts of JSR regular butyl 268 (trade name: Nippon Synthetic Rubber Co., Ltd.) as isobutylene / isoprene copolymer 0.5 parts of stearic acid, 5 parts of zinc oxide as a vulcanization aid, and 5 parts of butyl acrylate as an unsaturated compound are kneaded with two rolls, and then an alkylphenol formaldehyde resin (Sumitomo Chemical Co., Ltd.) is used as a vulcanizing agent.
0 parts were added and vulcanization molding was performed by a heat press to produce a resin vulcanized butyl rubber.

Table 1 shows that aluminum electrolytic capacitors were produced by using the butyl rubbers produced in Comparative Examples 1 and 2 and Embodiments 1 to 8 of the present invention as an elastic sealing member. 20 each
105 ° C for 1000 hours, 105 ° C for 2000 hours,
It shows the number of defective seals when a life test was performed in a high-temperature environment of 105 ° C. for 3,000 hours and 105 ° C. for 4,000 hours. As the driving electrolyte, a solution prepared by dissolving 25 parts of tetramethylammonium phthalate as a quaternary ammonium of an organic acid in 100 parts of γ-butyrolactone was used.

[0035]

[Table 1]

Table 2 shows that aluminum electrolytic capacitors were constructed by using the butyl rubbers prepared in Comparative Examples 1 and 2 and Embodiments 1 to 8 of the present invention as elastic sealing members. 20 each
85 ° C relative humidity 90% 1000 hours, 85 ° C relative humidity 90% 2500 hours, 85 ° C relative humidity 90% 500
It shows the number of defective seals when a life test was performed in a high-temperature, high-humidity environment of 0 hours, 85 ° C., and 90% relative humidity of 7,500 hours. As the driving electrolyte, a solution prepared by dissolving 25 parts of tetramethylammonium phthalate as a quaternary ammonium of an organic acid in 100 parts of γ-butyrolactone was used in the same manner as shown in the above (Table 1).

[0037]

[Table 2]

As apparent from (Table 1) and (Table 2),
The aluminum electrolytic capacitor formed by using the butyl rubber manufactured in Embodiments 1 to 8 of the present invention as an elastic sealing body is an aluminum electrolytic capacitor formed by using the butyl rubber manufactured in Comparative Examples 1 and 2 as an elastic sealing body. Thus, the number of defective seals can be greatly reduced, and a highly reliable aluminum electrolytic capacitor can be obtained.

In the first to eighth embodiments of the present invention, the amount of the unsaturated compound compounded in the butyl rubber is 0.5 parts by weight or 5 parts by weight based on 100 parts by weight of the butyl rubber which is the main component of the elastic sealing member. As is clear from (Table 1) and (Table 2), when the amount of the unsaturated compound is 0.5 parts by weight or more, the sealing property of the elastic sealing body is not particularly problematic, Good ones can be obtained.

The elastic sealing member made of butyl rubber manufactured in the first to eighth embodiments of the present invention can be applied to other electronic components such as an electric double layer capacitor other than the aluminum electrolytic capacitor.

[0041]

As described above, the electronic component of the present invention has a bottomed cylindrical metal case for housing a component element impregnated with a driving electrolyte, and an elastic sealing member for sealing the opening of the metal case. And an elastic sealing body is formed by blending an unsaturated compound with the elastic sealing body and vulcanizing the same. According to this configuration, the sealing property of the unsaturated compound can be improved, and It is possible to obtain an electrical component having high performance.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing a conventional aluminum electrolytic capacitor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Component element (capacitor element) 12 Metal case 13 Elastic sealing body

Claims (4)

[Claims] A bottomed cylindrical metal case for accommodating a component element impregnated with a driving electrolyte, and an elastic sealing body for sealing an opening of the metal case, wherein the elastic sealing body is unsaturated. An electronic component using a compound formed by compounding and vulcanizing. 2. The electronic component according to claim 1, wherein butyl rubber is used as a main component of the elastic sealing body. 3. The electronic component according to claim 2, wherein the unsaturated compound is compounded in an amount of 0.5 part by weight or more based on 100 parts by weight of butyl rubber as a main component. 4. The electronic component according to claim 2, wherein butyl rubber as a main component of the elastic sealing member is vulcanized with a peroxide or a resin.