JP2000091150A - Case sheathing type electronic component and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a damage of an electronic component element and a deformation of a case by sealing a water absorbing agent in an urethane resin in a case sheathing type electronic component. SOLUTION: Lead terminals 20 are respectively connected to metal-spraying electrodes 16 of a capacitor element 14 via solders 18. Thereafter, one end sides of the terminal 20 are led out of a case 12, and the element 14 is contained in the case 12. Then, a main agent containing an isocyanate as a material of an urethane resin as a main component, a curing agent containing a polyol as a main component and a silica gel as a water absorbing agent are mixed, filled in the case 12, agitated to react the isocyanate with the polyol to be cured to form the urethane resin. Thereafter, the silica gel is sealed in the urethane resin, and an opening of the case 12 is sealed. It is desirable to fill the silica gel at a blending ratio of 2 to 10 pts.wt. of the silica gel to 100 pts.wt. of the curing agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case exterior electronic component and a method of manufacturing the same, and more particularly, to a case containing electronic components such as a capacitor, which is filled with a resin material to seal a case opening. And a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, in order to improve the heat resistance and mechanical strength of an electronic component element such as a capacitor, the electronic component element such as a capacitor is housed in a case, and then filled with a resin material and cured. A case exterior electronic component having a structure in which a case opening is sealed is widely used.

As the resin material to be filled in the case, urethane resin is widely used because of its low cost and good workability. This is because a mixture of a main component mainly composed of isocyanate, which is a raw material of the urethane resin, and a curing agent mainly composed of polyol at a predetermined mixing ratio is filled in a case containing electronic component elements. By stirring, the isocyanate and the polyol are reacted and cured, and the case is filled with a urethane resin.

[0004]

However, since the above isocyanate is highly reactive with moisture, it is difficult to react with or cure the polyol, or when the case exterior electronic component is placed in a humid environment. The isocyanate may react with moisture to generate carbon dioxide gas. As a result, the gas pressure of the generated carbon dioxide gas causes damage to the electronic component elements housed in the case and deformation of the case. Further, the electronic component element housed in the case is formed by laminating and winding a plurality of metallized films formed by depositing an electrode metal layer on the surface of a dielectric film, and an oil such as silicon oil is provided between the metallized films. In the case of a capacitor element configured by impregnating with water, the gas pressure of carbon dioxide generated by the reaction of isocyanate with moisture causes the oil between the metallized films to be pushed out and leaked out of the case. Was.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to prevent the isocyanate, which is the raw material of the urethane resin, from reacting with water to generate carbon dioxide gas. Accordingly, it is an object of the present invention to provide a case exterior electronic component that does not cause damage to the electronic component element housed in the case or deformation of the case.

[0006]

In order to achieve the above-mentioned object, a case-outside electronic component according to the present invention comprises an electronic component element housed in a case, and a main component mainly composed of isocyanate and a polyol. A case exterior electronic component in which a case opening is sealed by filling a urethane resin formed by curing a curing agent as a main component and sealing a case opening, wherein a water absorbing agent is sealed in the urethane resin. Features.

The amount of the water-absorbing agent sealed in the urethane resin is preferably 2 parts by weight or more and 10 parts by weight or less based on 100 parts by weight of the curing agent. Further, as the water absorbing agent, for example, silica gel corresponds.

Further, according to the method of manufacturing a case exterior electronic component according to the present invention, after the electronic component element is stored in the case,
A main agent containing isocyanate as a main component, a curing agent containing polyol as a main component, and a water-absorbing agent are mixed and filled in a case, and the isocyanate and the polyol are reacted with each other.
Forming a urethane resin by curing,
It is characterized in that a water absorbing agent is sealed in the urethane resin and the case opening is sealed. It is desirable that the water absorbing agent is filled in a mixing ratio of 2 parts by weight or more and 10 parts by weight or less with respect to 100 parts by weight of the curing agent.

In the case exterior electronic component of the present invention, since a water absorbing agent is sealed in the urethane resin, moisture is absorbed by the water absorbing agent. This prevents the isocyanate from reacting with water other than the polyol during the reaction and curing of the isocyanate with the polyol to generate carbon dioxide gas. In addition, even in a humid environment, water is absorbed by the silica gel, so that isocyanate is prevented from reacting with water to generate carbon dioxide.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. FIG. 1 is a partial cross-sectional view of a case exterior electronic component 10 according to the present invention. The case exterior electronic component 10 houses a capacitor element 14 formed by laminating and winding a metallized film in a substantially rectangular parallelepiped case 12 made of an insulating material such as plastic or ceramic. The lead terminals 20, 20 are connected to the metallicon electrodes 16, 16 via solder 18, and the lead terminals 20, 20 are led out of the case 12, and the urethane resin is placed in the case 12.
The basic configuration is that 22 is filled and the case opening is sealed.

The case exterior type electronic component 10 is manufactured by the following method. First, as shown in FIG. 2, a metal such as aluminum or zinc is vapor-deposited on the surface of a tape-shaped dielectric film 24 made of a synthetic resin such as polyethylene terephthalate, polypropylene or polyamide, leaving a margin 26 at one end. Then, a pair of metallized films 30 on each of which an electrode metal layer 28 having a thickness of about 300 to 500 angstroms is formed are stacked so that the margin portions 26 of the respective metallized films 30 are arranged on the opposite side, and are wound up, not shown. The end of the winding is fixed by welding or the like.

Next, after a flattening is performed by applying a predetermined pressure, a metallikon electrode 16 for taking out is formed by spraying an electrode material such as lead, tin or zinc on both end surfaces. After that, silicon oil was applied from both ends (the surface on which the metallikon electrode 16 was formed) to the metallikon electrode by vacuum impregnation.
The capacitor element 14 is formed by impregnating the metal particles by passing through between the 16 metal particles. The impregnation with silicon oil is performed by laminating a pair of metallized films 30, 30.
When air is present between the metallized films 30 and 30 during winding, the air has a lower electric permittivity than the dielectric film 24, so that the air gap becomes a high electric field and partial discharge occurs. Finally, since there is a risk that the capacitor element 14 may be destroyed, the air existing between the metallized films 30 and 30 is externally impregnated with oil by laminating and winding the metallized films 30 and 30. In order to repel.

The lead terminals 2 are connected to the metallikon electrodes 16 of the capacitor element 14 via the solders 18.
Connect 0 and 20 (Fig. 3). Then, lead terminal 2
One end of 0, 20 is led out of the case 12,
The capacitor element is housed in the case 12. Next, 42 parts by weight of a main component (liquid) mainly composed of isocyanate as a raw material of the urethane resin, 100 parts by weight of a curing agent (liquid) mainly composed of polyol, and 2 parts by weight of silica gel as a water absorbing agent were used. When mixed in the mixing ratio and filled in the case 12, and stirred, the isocyanate in the main agent and the polyol in the curing agent react and cure to form a urethane resin, and as a result, silica gel is contained in the urethane resin. While being enclosed, the opening of the case 12 is sealed to complete the case exterior electronic component 10 of the present invention.

Thus, the case exterior type electronic component 10 of the present invention
As described above, as described above, silica gel as a water absorbing agent is sealed in the urethane resin, and as a result, water is absorbed by the silica gel. To generate carbon dioxide gas. Further, even when the case exterior electronic component 10 of the present invention is placed in a humid environment, moisture is absorbed by the silica gel, so that isocyanate is prevented from reacting with moisture to generate carbon dioxide gas. Is done. As a result,
Case 12 is deformed by carbon dioxide gas generated by the reaction of isocyanate with moisture, or the capacitor element
It is possible to prevent the silicon oil impregnated between the metallized films 30, 30 from being pushed out and leaking out of the case 12.

FIG. 4 shows the rejection rate of the case exterior type electronic component 10 that caused oil leakage and deformation of the case 12 after 16 hours at a temperature condition of 100 ° C. and the ratio of silica gel to 100 parts by weight of the curing agent. It is a graph which shows the relationship with a compounding ratio. As shown in the graph, as a result of an experiment conducted by the inventor, it was found that when 2 parts by weight or more of silica gel was added, the reject rate was remarkably reduced. However, on the other hand, if the amount of the silica gel is too large, the quality of the urethane resin is degraded and the cost is increased.
Therefore, it is preferable that the mixing ratio of the silica gel is 2 parts by weight or more and 10 parts by weight or less.

The present invention is not limited to the above embodiment, but can be appropriately modified without departing from the spirit of the present invention. For example, in the above description, a capacitor element manufactured by laminating and winding a metallized film is illustrated, but the present invention is also applicable to a capacitor element manufactured by laminating a plurality of metallized films without going through a winding step. It is possible. Also,
The present invention is also applicable to a capacitor element manufactured by alternately laminating dielectric films and metal electrode foils, or laminating and winding.

Further, the electronic component elements housed in the case are not limited to the capacitor elements, but include all electronic component elements such as surge absorbing elements and resistors.

[0018]

In the case-equipped electronic component according to the present invention, since the water-absorbing agent is encapsulated in the urethane resin, the isocyanate reacts with moisture other than the polyol during the reaction and curing of the isocyanate and the polyol. In addition to preventing carbon dioxide gas from being generated, the isocyanate is prevented from reacting with moisture to generate carbon dioxide gas even when placed in a humid environment.

As a result, the case is deformed by the carbon dioxide gas generated by the reaction of the isocyanate with the moisture, or the electronic component element housed in the case is impregnated with oil such as silicon oil between the metallized films. Even in the case of a capacitor element configured as described above, it is possible to prevent oil from being pushed out and leaking out of the case.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a case exterior electronic component according to the present invention.

FIG. 2 is a perspective view showing a process of forming a capacitor element by laminating and winding a pair of metallized films.

FIG. 3 is a perspective view of a capacitor element.

FIG. 4 is a graph showing a relationship between a defective rate of the case exterior type electronic component and a mixing ratio of silica gel.

[Explanation of symbols]

 10 Case exterior type electronic parts 12 Case 14 Capacitor element 16 Metallicon electrode 20 Lead terminal 22 Urethane resin

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[Procedure amendment]

[Submission date] August 27, 1999 (1999.8.2
7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

Patent application title: Case exterior type electronic component and method of manufacturing the same

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case exterior electronic component and a method of manufacturing the same, and more particularly, to a case containing electronic components such as a capacitor, which is filled with a resin material to seal a case opening. And a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, in order to improve the heat resistance and mechanical strength of an electronic component element such as a capacitor, the electronic component element such as a capacitor is housed in a case, and then filled with a resin material and cured. A case exterior electronic component having a structure in which a case opening is sealed is widely used.

As the resin material to be filled in the case, urethane resin is widely used because of its low cost and good workability. This is because a mixture of a main component mainly composed of isocyanate, which is a raw material of the urethane resin, and a curing agent mainly composed of polyol at a predetermined mixing ratio is filled in a case containing electronic component elements. The isocyanate and the polyol are reacted and cured by stirring, and the case is filled with a urethane resin.

[0004]

However, since the above isocyanate is highly reactive with moisture, it is difficult to react with or cure the polyol, or when the case exterior electronic component is placed in a humid environment. The isocyanate may react with moisture to generate carbon dioxide gas. As a result, the gas pressure of the generated carbon dioxide gas causes damage to the electronic component elements housed in the case and deformation of the case. Further, the electronic component element housed in the case is formed by laminating and winding a plurality of metallized films formed by depositing an electrode metal layer on the surface of a dielectric film, and an oil such as silicon oil is provided between the metallized films. In the case of a capacitor element configured by impregnating with water, the gas pressure of carbon dioxide generated by the reaction of isocyanate with moisture causes the oil between the metallized films to be pushed out and leaked out of the case. Was.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to prevent the isocyanate, which is the raw material of the urethane resin, from reacting with water to generate carbon dioxide gas. Accordingly, it is an object of the present invention to provide a case exterior electronic component that does not cause damage to the electronic component element housed in the case or deformation of the case.

[0006]

In order to achieve the above-mentioned object, a case-outside electronic component according to the present invention comprises an electronic component element housed in a case, and a main component mainly composed of isocyanate and a polyol. A case exterior electronic component in which a case opening is sealed by filling a urethane resin formed by curing a curing agent as a main component, wherein the urethane resin contains 100 parts by weight of the curing agent Against
Silica gel at a blending ratio of 2 to 10 parts by weight
It is characterized by being enclosed .

Further, according to the method for manufacturing a case exterior electronic component according to the present invention, after the electronic component element is stored in the case,
A main agent mainly composed of isocyanate, a curing agent mainly composed of polyol, and 2 parts by weight based on 100 parts by weight of the curing agent.
Filled into the case by mixing a silica gel proportion of 10 parts by weight or less or more parts by weight, and the isocyanate and the polyol urethane resin is formed by reacting and curing, Te following, silica gel in the urethane resin And the case opening is sealed.

[0008] In the case exterior electronic component of the present invention, since silica gel is sealed in the urethane resin, moisture is absorbed by the silica gel . This prevents the isocyanate from reacting with water other than the polyol during the reaction and curing of the isocyanate with the polyol to generate carbon dioxide gas. In addition, even in a humid environment, water is absorbed by the silica gel, so that isocyanate is prevented from reacting with water to generate carbon dioxide.

[0009] The mixing ratio of the above silica gel is
When the amount is 2 parts by weight or more with respect to 0 parts by weight, oil leakage is prevented.
Of the case exterior type electronic parts
The yield of non-defective products can be significantly reduced.
By lowering the weight part, the quality of the urethane resin deteriorates.
And high cost can be prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. FIG. 1 is a partial cross-sectional view of a case exterior electronic component 10 according to the present invention. The case exterior electronic component 10 houses a capacitor element 14 formed by laminating and winding a metallized film in a substantially rectangular parallelepiped case 12 made of an insulating material such as plastic or ceramic. The lead terminals 20, 20 are connected to the metallicon electrodes 16, 16 via solder 18, and the lead terminals 20, 20 are led out of the case 12, and the urethane resin is placed in the case 12.
The basic configuration is that 22 is filled and the case opening is sealed.

The case exterior type electronic component 10 is manufactured by the following method. First, as shown in FIG. 2, a metal such as aluminum or zinc is vapor-deposited on the surface of a tape-shaped dielectric film 24 made of a synthetic resin such as polyethylene terephthalate, polypropylene or polyamide, leaving a margin 26 at one end. Then, a pair of metallized films 30 on each of which an electrode metal layer 28 having a thickness of about 300 to 500 angstroms is formed are stacked so that the margin portions 26 of the respective metallized films 30 are arranged on the opposite side, and are wound up, not shown. The end of the winding is fixed by welding or the like.

Next, after a flattening is performed by applying a predetermined pressure, a metallikon electrode 16 for taking out is formed by spraying an electrode material such as lead, tin or zinc on both end surfaces. After that, silicon oil was applied from both ends (the surface on which the metallikon electrode 16 was formed) to the metallikon electrode by vacuum impregnation.
The capacitor element 14 is formed by impregnating the metal particles by passing through between the 16 metal particles. The impregnation with silicon oil is performed by laminating a pair of metallized films 30, 30.
When air is present between the metallized films 30 and 30 during winding, the air has a lower electric permittivity than the dielectric film 24, so that the air gap becomes a high electric field and partial discharge occurs. Finally, since there is a risk that the capacitor element 14 may be destroyed, the air existing between the metallized films 30 and 30 is externally impregnated with oil by laminating and winding the metallized films 30 and 30. In order to repel.

The lead terminals 2 are connected to the metallikon electrodes 16 of the capacitor element 14 via the solders 18.
Connect 0 and 20 (Fig. 3). Then, lead terminal 2
One end of 0, 20 is led out of the case 12,
The capacitor element is housed in the case 12. Next, 42 parts by weight of a main component (liquid) mainly composed of isocyanate as a raw material of the urethane resin, 100 parts by weight of a curing agent (liquid) mainly composed of polyol, and 2 parts by weight of silica gel as a water absorbing agent were used. When mixed in the mixing ratio and filled in the case 12, and stirred, the isocyanate in the main agent and the polyol in the curing agent react and cure to form a urethane resin, and as a result, silica gel is contained in the urethane resin. The case 12 is sealed and the opening of the case 12 is sealed to complete the case exterior electronic component 10 of the present invention.

Thus, the case exterior type electronic component 10 of the present invention
As described above, as described above, silica gel as a water absorbing agent is sealed in the urethane resin, and as a result, water is absorbed by the silica gel. To generate carbon dioxide gas. Further, even when the case exterior electronic component 10 of the present invention is placed in a humid environment, moisture is absorbed by the silica gel, so that isocyanate is prevented from reacting with moisture to generate carbon dioxide gas. Is done. As a result,
Case 12 is deformed by carbon dioxide gas generated by the reaction of isocyanate with moisture, or the capacitor element
It is possible to prevent the silicon oil impregnated between the metallized films 30, 30 from being pushed out and leaking out of the case 12.

FIG. 4 shows the rejection rate of the case exterior type electronic component 10 that caused oil leakage and deformation of the case 12 after 16 hours at a temperature condition of 100 ° C. and the ratio of silica gel to 100 parts by weight of the curing agent. It is a graph which shows the relationship with a compounding ratio. As shown in the graph, as a result of an experiment conducted by the inventor, it was found that when 2 parts by weight or more of silica gel was added, the reject rate was remarkably reduced. However, on the other hand, if the amount of the silica gel is too large, the quality of the urethane resin is degraded and the cost is increased.
Therefore, it is preferable that the mixing ratio of the silica gel is 2 parts by weight or more and 10 parts by weight or less.

The present invention is not limited to the above embodiment, but can be appropriately modified without departing from the spirit of the present invention. For example, in the above description, a capacitor element manufactured by laminating and winding a metallized film is illustrated, but the present invention is also applicable to a capacitor element manufactured by laminating a plurality of metallized films without going through a winding step. It is possible. Also,
The present invention is also applicable to a capacitor element manufactured by alternately laminating dielectric films and metal electrode foils, or laminating and winding.

Further, the electronic component elements housed in the case are not limited to the capacitor elements, but include all electronic component elements such as surge absorbing elements and resistors.

[0018]

According to the present invention, since the silica gel is encapsulated in the urethane resin, the isocyanate reacts with water other than the polyol during the reaction and curing of the isocyanate and the polyol. The generation of carbon dioxide is prevented, and the isocyanate is prevented from reacting with moisture to generate carbon dioxide even when placed in a humid environment.

[0019] This result, carbon dioxide isocyanate is generated reacts with water, casing or deformed, or the electronic component element housed inside the casing, impregnated with oil silicone oil or the like between the metallized film Even in the case of a capacitor element configured as described above, it is possible to prevent oil from being pushed out and leaking out of the case. The above
The mixing ratio of Rica gel is 2 parts per 100 parts by weight of the curing agent.
By setting the weight part or more, oil leakage, deformation of the case, etc.
Rejection rate of case-outside electronic components
Be reduced to 10 parts by weight or less.
As a result, the quality of urethane resin deteriorates and the cost increases.
Can be prevented.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a case exterior electronic component according to the present invention.

FIG. 2 is a perspective view showing a process of forming a capacitor element by laminating and winding a pair of metallized films.

FIG. 3 is a perspective view of a capacitor element.

FIG. 4 is a graph showing a relationship between a defective rate of the case exterior type electronic component and a mixing ratio of silica gel.

[Description of Signs] 10 Case-outer type electronic component 12 Case 14 Capacitor element 16 Metallicon electrode 20 Lead terminal 22 Urethane resin

Claims (6)

[Claims] An electronic component element is housed in a case, and a urethane resin formed by curing a main component containing isocyanate as a main component and a curing agent containing polyol as a main component is filled to form a case opening. A case exterior electronic component comprising a sealed case, wherein a water absorbing agent is sealed in the urethane resin. 2. The water-absorbing agent encapsulated in the urethane resin is used in an amount of 2 to 10 parts by weight based on 100 parts by weight of the curing agent.
The case exterior electronic component according to claim 1, wherein the content is not more than part by weight. 3. The case-equipped electronic component according to claim 1, wherein the water-absorbing agent is silica gel. 4. After storing the electronic component element in the case,
A main agent containing isocyanate as a main component, a curing agent containing polyol as a main component, and a water-absorbing agent are mixed and filled in a case, and the isocyanate and the polyol are reacted with each other.
Forming a urethane resin by curing,
A method for manufacturing a case exterior electronic component, wherein a water absorbing agent is sealed in a urethane resin and a case opening is sealed. 5. The case-equipped electronic component according to claim 4, wherein the water-absorbing agent is filled in an amount of 2 to 10 parts by weight based on 100 parts by weight of the curing agent. Production method. 6. The method according to claim 4, wherein the water-absorbing agent is silica gel.