JP2016092013A - Potting composition filling method, and method for manufacturing article with potting composition filled therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a potting composition filling method which enables the prevention or reduction of the occurrence of crack in a potting composition.SOLUTION: A potting composition filling method according to an embodiment disclosed herein comprises the steps of: preparing at least one part, a case having inner walls defining an internal space for housing the at least one part, and a potting composition; putting the at least one part in the internal space of the case; putting at least one dividing material in the internal space of the case; filling the potting composition in a gap between the at least one part and the inner walls of the case; and curing the potting composition. The at least one dividing material is at least partially immersed in the potting composition and serves to divide the potting composition in a depth direction of the potting composition, and disposed to substantially divide an exposed surface of the potting composition into partitions, thereby preventing or reducing the occurrence of a crack in the potting composition after curing the potting composition.SELECTED DRAWING: Figure 4

Description

  The present disclosure relates to a method for filling a potting composition and a method for producing an article filled with the potting composition.

  Potting compositions are used in electronic devices such as battery chargers, battery units in electric vehicles and plug-in hybrid vehicles. The potting composition is filled between electronic parts such as toroidal coils, transformer coils and ferrite cores and the wall of the container to fix the position of the electronic parts in the container and to electrically insulate, protect and waterproof the electronic parts. Contributes to dust prevention.

  Patent Document 1 (Japanese Patent Application Laid-Open No. 2011-124267) states that “a case having a central barrier that divides an internal space into two spaces and two spaces that are partitioned by the central barrier in the case are provided 2 each. The reactor fixed structure characterized by including the reduction | restoration part which comprises two reactors and a central barrier contains the difference of the thermal expansion coefficient of a case and a reactor is described.

  Patent Document 2 (Japanese Patent Application Laid-Open No. 2006-147687) states that “a film capacitor element, a metal terminal connected to an electrode portion of the film capacitor element, and a case for housing them, The metal terminal is sealed in a case with a plurality of layers of epoxy resin composition, and the plurality of layers of epoxy resin composition are arranged in layers, and the wire of the epoxy resin composition disposed in the uppermost layer A film capacitor characterized in that the expansion coefficient is minimized is described.

JP 2011-124267 A JP 2006-147687 A

  Potting compositions used in applications with a wide operating temperature range, such as automobile battery units, generally have a low elastic modulus because they are required to absorb stress resulting from temperature changes. However, depending on the type and composition of the potting composition, the intermolecular cross-linking gradually progresses in a high temperature (for example, 150 ° C.) environment, and the volume of the potting composition shrinks. Cracks due to the occurrence may occur. Further, for example, when a thermal shock is applied in a temperature range of −40 to 120 ° C., thermal stress is generated in the potting composition due to the difference in thermal expansion coefficient between the potting composition and the case and the parts, and the potting composition is cracked. May occur. Cracks frequently occur especially in areas where shrinkage stresses are concentrated, such as at or near the interface between the potting composition and the inner wall of the case filled with it or the parts placed in the case. Or it may occur on the surface and inside of the potting composition away from the vicinity.

  Conventionally, as a potting composition, a composition containing a silicone resin is often used. Silicone resins have the advantage of maintaining low elasticity and stability over a wide temperature range, but are expensive. In recent years, low-elasticity epoxy resins that can be used in potting compositions have been developed, but low-elasticity epoxy resins tend to shrink due to intermolecular crosslinking when placed in a high-temperature environment for a long time. The potting composition that is included is prone to cracking. Since epoxy resins are less expensive than silicone resins, it is desirable to use epoxy resins in potting compositions as alternatives to silicone resins. Further, from the viewpoint of diversification of materials, there is a demand for a technique that can be applied to various types of potting compositions and that prevents the occurrence of cracks in the potting compositions.

  The present disclosure provides a method for filling a potting composition capable of preventing or reducing cracking of the potting composition, and a method for producing an article filled with the potting composition.

  According to one embodiment of the present disclosure, providing one or more components, a case having an inner wall defining an interior space for accommodating the components, and a potting composition; and placing the components in the interior space of the case Disposing one or more partition members in the internal space of the case, filling the potting composition in a gap between the part and the inner wall of the case, and the potting composition A potting composition filling method comprising: dipping the potting composition at least partially in the potting composition to partially partition the potting composition in a depth direction; and Arranged to substantially partition the exposed surface of the potting composition into a plurality of compartments, whereby after the potting composition is cured The contact surface of the potting composition and the component and the inner wall of the case, to prevent or reduce the occurrence of cracks in the surface and interior of the potting composition, filling method of the potting composition.

  According to another embodiment of the present disclosure, providing one or more parts, a case having an inner wall defining an interior space for accommodating the parts, and a potting composition; and placing the parts in the interior space of the case Arranging in the interior space of the case, filling the potting composition in a gap between the part and the inner wall of the case, and the potting composition Curing the article to form an article filled with the potting composition, wherein the partition material is at least partially in the potting composition. So that the potting composition is partially partitioned in the depth direction and the exposed surface of the potting composition is substantially divided into a plurality of compartments. This prevents the occurrence of cracks in the contact surface between the potting composition and the part and the inner wall of the case, the surface of the potting composition and the interior thereof after the potting composition is cured, or A method of manufacturing an article filled with a potting composition that mitigates is provided.

  According to the filling method of the present disclosure, the potting composition is cured by partially partitioning the potting composition in the depth direction with the partition material and substantially partitioning the exposed surface of the potting composition into a plurality of sections. Later, it is possible to prevent or reduce the occurrence of cracks in the contact surface between the potting composition and the inner wall of the part and the case, the surface of the potting composition, and the inside thereof.

  According to the manufacturing method of the present disclosure, the partition material partially partitions the potting composition in the depth direction, so that the potting composition is distributed throughout the intended filling region in the case without disturbing the flow of the potting composition. Can be made. In addition, since the partition material can be placed in contact with or above the component, there are few restrictions on the shape and position of the partition material. Therefore, the method of the present disclosure can be applied to cases and parts having various shapes.

  The above description should not be construed as disclosing all embodiments of the present invention and all advantages related to the present invention.

FIG. 6 is a top view of an article in which components are arranged in an internal space of a case according to an embodiment of the present disclosure. It is sectional drawing along the II line of the article | item of FIG. FIG. 6 is a top view of an article in which components and a partition member are arranged in an internal space of a case according to an embodiment of the present disclosure. FIG. 3 is a cross-sectional view of one embodiment of the article of FIG. 2 taken along line II-II. FIG. 3 is a cross-sectional view of another embodiment of the article of FIG. 2 taken along line II-II. FIG. 6 is a top view of an article according to another embodiment of the present disclosure in which components and a partition material are arranged in an internal space of a case. 1 is a top view of an article filled with a potting composition, according to one embodiment of the present disclosure. FIG. It is sectional drawing along the III-III line of the article | item of FIG. It is a photograph of the case and partition material which were used in preliminary experiment examples 1 and 2. It is a cross-sectional schematic diagram along the IV-IV line of the photograph of the preliminary experiment example 1 of FIG. It is a photograph which shows the high temperature aging test result of preliminary experiment examples 1-3. It is a partition pattern of the potting composition by the partition material used in the preliminary experiment example. It is a partition pattern of the potting composition by the partition material used in the preliminary experiment example. It is a partition pattern of the potting composition by the partition material used in the preliminary experiment example. It is a partition pattern of the potting composition by the partition material used in the preliminary experiment example. It is a partition pattern of the potting composition by the partition material used in the preliminary experiment example.

  Hereinafter, the present invention will be described in more detail with reference to the drawings for the purpose of illustrating typical embodiments of the present invention, but the present invention is not limited to these embodiments. In the drawings, elements denoted by the same reference numerals have the same or equivalent configurations unless otherwise specified, and description thereof will not be repeated.

  In the present disclosure, a “potting composition” is defined as a composition used for the purpose of covering at least a part of the surface of an object of interest and / or fixing the position of the object relative to another object. The material, shape and arrangement of other objects surrounding the composition or on which the potting composition is placed may vary.

  In the present disclosure, “immersion depth” refers to the distance from the exposed surface of the potting composition to the deepest position of the part immersed in the potting composition of the partition material.

  A potting composition filling method according to one embodiment of the present disclosure includes providing one or more parts, a case having an inner wall defining an interior space for housing the parts, and a potting composition; Placing in the interior space, placing one or more dividers in the interior space of the case, filling the potting composition into the gap between the part and the inner wall of the case, and curing the potting composition Including. The partitioning material is disposed so as to be at least partially immersed in the potting composition, partially partition the potting composition in the depth direction, and substantially partition the exposed surface of the potting composition into a plurality of compartments; After the potting composition is cured, the occurrence of cracks on the contact surface between the potting composition and the inner wall of the part and the case, the surface of the potting composition, and the interior thereof is prevented or reduced.

  Cracking of the potting composition is caused by volumetric shrinkage due to progress of intermolecular crosslinking in a high temperature environment after filling and curing, or thermal stress generated by thermal shock. The present inventors at least partially immerse the partition material in the potting composition, partially partition the potting composition in the depth direction, and substantially expose the exposed surface of the potting composition into a plurality of compartments. It has been found that the occurrence of cracks in the potting composition can be prevented or reduced after the potting composition is cured by disposing the potting composition. Although not wishing to be bound by theory, it is possible to prevent the occurrence of cracks in the potting composition by reducing the shrinkage distance of the surface of the potting composition by dividing the surface of the potting composition into a plurality of compartments with a partition material. Presumed to contribute to mitigation.

  Examples of components housed in the case include smoothing capacitors, film capacitors, in-vehicle chargers, non-contact chargers, DC-DC converters, ECUs, reactor devices, coils such as toroidal coils, and electronic components such as IC substrates. It is done.

  The case generally has one or more openings that are used for part placement and filling of the potting composition. Examples of materials for the case include metals with high heat stability such as aluminum, stainless steel and magnesium, non-metals such as ceramic, polyester, polycarbonate, polyamide, polyimide, polybutylene terephthalate, polyphenylene sulfide, polyarylate, polyamideimide, poly Resins such as ether imide can be used. The case may have any shape having an internal space of a predetermined volume that can accommodate the parts and can be filled with the potting composition, for example, a rectangular parallelepiped having an opening, a cube, a cylinder, etc., and the bottom surface is indefinite. A tray shape or a box shape may be sufficient.

  As the potting composition, a one-component or two-component resin composition containing an epoxy resin, a silicone resin, a urethane resin, or the like can be used.

  In one embodiment, a two-part epoxy potting composition comprising a main agent and a curing agent is used as the potting composition. Although the two-component epoxy potting composition tends to undergo intermolecular crosslinking in a high temperature environment and tends to cause cracking due to volume shrinkage depending on the composition, it has durability in a high temperature and / or high humidity environment. Due to the high and low cost, the method of the present disclosure can provide particularly significant benefits. The two-pack type epoxy potting composition is a composition containing a polyfunctional epoxy resin, a polyfunctional amino compound, an inorganic filler, and a non-reactive diluent as necessary, and is generally a polyfunctional epoxy resin. Is contained in the main agent, and a polyfunctional amino compound is contained in the curing agent.

  According to the method of the present invention, one or more parts are arranged in the internal space of the case. FIG. 1 is a top view of an article in which components are arranged in an internal space of a case according to an embodiment of the present disclosure, and FIG. 1A is a cross-sectional view taken along line II of the article. In these drawings, the component 1 is arranged in the internal space of the case 2.

  In FIG. 1, a ring-shaped toroidal coil is shown as the component 1, but various other components can be arranged. The part may be secured to the case prior to filling and curing the potting composition by various means, such as a coupling member such as a bolt, an adhesive such as an epoxy adhesive, and is secured by the cured potting composition. May be. In FIG. 1, the component 1 is arranged at the center of the bottom surface of the case 2, but the component can be arranged at an arbitrary position in the internal space of the case. For example, the side part of the component may be in contact with the inner wall of the case.

  In FIG. 1A, the component 1 is disposed in contact with the bottom surface of the case 2, but other components, an adhesive, a potting composition, and the like may exist between the component and the bottom surface of the case.

  According to the method of the present disclosure, one or a plurality of partition members are arranged in the internal space of the case. FIG. 2 is a top view of an article in which components and a partition member are arranged in the internal space of the case according to an embodiment of the present disclosure. In FIG. 2, one partition member 3 is arranged across the part 1.

  2A and 2B show cross-sectional views of several embodiments along line II-II of the article of FIG. In FIG. 2A and 2B, the partition material 3 is arrange | positioned spaced apart from the bottom face of the case 2, and when a potting composition is filled up, a potting composition is partially partitioned in the depth direction. The partition material 3 may be brought into contact with the component 1 as shown in FIG. 2A, or may be arranged above the component 1 as shown in FIG. 2B. A partition material may be arrange | positioned before filling with a potting composition, and may be arrange | positioned after filling with a potting composition.

  There may be one or more partition members. FIG. 3 is a top view of an article in which components and a partition material are arranged in the internal space of the case according to another embodiment of the present disclosure, and the partition materials 31 and 32 are arranged in the internal space of the case 2.

  The partition member may be disposed above or above the component as shown in FIG. 2, or may be disposed so as not to overlap the component as viewed from above as shown in FIG.

  The partition material may be linear when viewed from above as shown in FIGS. 2 and 3, potting composition such as curved line, wavy line, bent wavy line consisting of straight line, lattice, circle, triangle, irregular shape, etc. It may have any shape as long as it can partition an object. The width when viewed from the top of the partitioning material is only required to have sufficient rigidity to partition the potting composition, and can be, for example, about 1 to 2 mm.

  The partition material is a material that is stable at a temperature at which the potting composition is exposed during curing and use (for example, a temperature range of −40 to 150 ° C.) and has a rigidity that can retain a shape when the potting composition contracts. Can be formed. Materials used for the partition material include, for example, metals such as aluminum and stainless steel, and acrylic resin, polyamide, polyimide, polypropylene, vinylidene chloride resin, polycarbonate, acetal resin, polyethylene terephthalate, polybutylene terephthalate, polyphenylene sulfide, unsaturated Examples thereof include polyesters such as polyester resin, plastics such as fluorine resin, phenol resin, melamine resin, polyurethane, and epoxy resin.

  According to the method of the present invention, the potting composition is filled in the gap between the part and the inner wall of the case. FIG. 4 is a top view of an article filled with a potting composition, according to one embodiment of the present disclosure, and FIG. 4A is a cross-sectional view of the article along the line III-III. In these figures, the part 1 exposed in FIG. 2 is completely embedded by the potting composition 4, but the part may be partially exposed. Examples of the portion exposed from the potting composition include, but are not limited to, a terminal portion of a coil, a terminal of a component such as a capacitor, and a reactor.

  In FIG. 4, the exposed surface of the potting composition 4 indicates the occurrence of cracks in the contact surface between the potting composition 4 and the inner wall of the part 1 and the case 2, and the surface of the potting composition 4 and the interior after the potting composition 4 is cured. In order to prevent or reduce the above, the partition material 3 is substantially divided into two sections.

  In some embodiments, on the exposed surface of the potting composition, the minimum distance between the divider and the inner wall of the case, the minimum distance between the dividers, and the portion of the divider and part exposed from the potting composition. The minimum distance is about 10 mm or less, about 5 mm or less, or about 2 mm or less.

  In FIG. 4, the partition member is in contact with the inner wall of the case, but the partition member and the inner wall of the case may be separated by a distance of about 10 mm or less, about 5 mm or less, or about 2 mm or less. Similarly, in FIG. 4, the partition member does not have a separated portion, but the partition members may be separated by a distance of about 10 mm or less, about 5 mm or less, or about 2 mm or less. Although not shown in FIG. 4, the exposed surface of the potting composition is such that a portion of the part exposed from the potting composition is interposed between the partition material and the inner wall of the case and / or between the partition materials. May be partitioned. At this time, the part exposed from the potting composition of the part may be in contact with the partition material, and the distance between the part exposed from the potting composition of the part and the part is about 10 mm or less, about 5 mm or less, or about 2 mm. They may be separated by the following distance.

  Referring to FIG. 4A, the partition material 3 is at least partially immersed in the potting composition 4 at the immersion depth d to partially partition the potting composition in the depth direction. This allows the potting composition to be distributed throughout the intended filling area in the case without disturbing the flow of the potting composition. In some embodiments, the immersion depth d is about 1 mm or more, about 2 mm or more, about 5 mm or more, or about 10 mm or more. In some embodiments, the immersion depth d is less than the depth D of the potting composition. That is, the partition member 3 is separated from the bottom surface of the case. However, a part of the partition material 3 may be in contact with the bottom surface of the case and / or a part to the extent that the flow of the potting composition is not hindered.

  In some embodiments, the divider may partition the potting composition in a direction substantially perpendicular to the exposed surface of the potting composition.

  On the exposed surface of the potting composition, the number of sections substantially partitioned by the partition material can be appropriately determined according to the area of the exposed surface, the position of the part exposed from the potting composition of the part, and the like. For example, the number of sections can be an integer of 2 or more, 3 or more, or 4 or more, 20 or less, 12 or less, or 8 or less.

On the exposed surface of the potting composition, the area of each section substantially partitioned by the partition material is, for example, about 100 mm ² or more, or about 400 mm ² or more, about 2000 mm ² or less, 2500 mm ² or less, 3000 mm ² or less, 3500 mm ^2. Below, it can be 4000 mm ² or less, 4500 mm ² or less, or 5000 mm ² or less. When the partition material and the inner wall of the case, the partition materials, and / or the parts exposed from the potting composition of the partition material and the parts are separated, each partition is defined by a virtual straight line that determines the minimum distance between these elements. The area of each section is determined as being divided.

  According to the method of the present invention, the potting composition is cured by, for example, room temperature curing, heat curing, visible light curing, ultraviolet curing or the like. If necessary, the upper part of the case may be covered with a lid before or after the potting composition is cured. The case may be covered with a lid simultaneously with partitioning the potting composition using a partition material integrated with the lid.

  According to another embodiment of the present disclosure, an article filled with a potting composition can be produced by the method described above.

  The method of the present disclosure typically includes an electronic device such as a smoothing capacitor, a film capacitor, an in-vehicle charger, a non-contact charger, a DC-DC converter, an ECU, a reactor device, a coil, and an IC substrate disposed in a case. It can be suitably used in applications where parts are sealed with a potting composition.

  In the following examples, specific embodiments of the present disclosure are illustrated, but the present invention is not limited thereto. All parts and percentages are by weight unless otherwise specified.

  The materials used as components of the potting composition in this example are shown in Table 1 below.

<Preliminary Experiment Examples 1-3>
<Case and partition material>
As a case, a rectangular tray-shaped aluminum case (wall thickness 2 mm) having an outer dimension of 96 mm × width 66 mm × height 30 mm was used. As the partition material, a polyamide plate having a thickness of 2 mm cut into a predetermined shape was used. When the partition material was installed in the case, the potting composition was partitioned by the thickness of the partition material.

<Potting composition>
As the potting composition, a two-component epoxy potting composition having the following composition was used. The main agent was obtained by putting the materials listed in Table 2 into a container, stirring with a planetary mixer to prepare a uniform dispersion, and degassing the resulting dispersion while stirring in a vacuum. . The curing agent was obtained by stirring the materials listed in Table 3 in a separate container under nitrogen to prevent the amine component from absorbing carbon dioxide. The main agent and the curing agent were mixed at a mass ratio of 100: 12.6 using a stirring deaerator at 2000 rpm for 1 minute and deaerated for 1 minute.

<Arrangement of partition material>
As shown in FIG. 5, the partition material cut into a trapezoid was placed in the case. The exposed surface of the potting composition after pouring the potting composition into the case was partitioned into a plurality of compartments as shown in FIG. 7B (preliminary experimental example 1) and FIG. 7C (preliminary experimental example 2). A gap s of 5 mm is maintained between the case bottom and the partition material (see FIG. 5A), and the gap allows the potting composition to freely flow between the compartments. As understood from the schematic cross-sectional view of FIG. 5A, both ends of each partition member having a tapered shape were supported by the upper ends of the edges of the case. In preliminary experimental example 3, no partition material was arranged.

<Filling and curing of potting composition>
The potting composition was poured into one compartment in the case that had been preheated to 60 ° C. The potting composition flowed smoothly from one compartment to the other. The pouring process was completed within 30 seconds. The partition material was immersed from the surface of the potting composition at a depth of 20 mm. The minimum distance between the partition member and the case inner wall on the exposed surface of the potting composition was 0 mm. After pouring the potting composition, the case was placed in a convection oven and the potting composition was cured at 125 ° C. for 90 minutes.

<High temperature aging test>
The case containing the cured potting composition was stored and aged in a convection oven at 150 ° C., and the appearance was visually evaluated.

<Result>
Table 4 shows the partition pattern of the partition material, the immersion depth, the distance and material from the bottom surface, the area and number of compartments, and the results of the high temperature aging test. In Preliminary Experimental Examples 1 and 2, the potting composition did not crack even after the 168 hour high temperature aging test. On the other hand, in Preliminary Experimental Example 3, cracks occurred in the potting composition in 96 hours. The appearance after the high temperature aging test is shown in FIG.

<Preliminary Experimental Examples 4 to 13>
<Case and partition material>
As a case, a rectangular tray-shaped aluminum case (wall thickness 2 mm) having an outer dimension of 96 mm × width 66 mm × height 30 mm was used. As the partition material, a 2 mm thick acrylic plate, polyamide plate, or polypropylene plate cut out in a predetermined shape was used. When the partition material was installed in the case, the potting composition was partitioned by the thickness of the partition material.

<Potting composition>
Prepared in the same manner as in Preliminary Experimental Examples 1-3.

<Arrangement of partition material>
The partition material was arrange | positioned in a case so that the exposed surface of the potting composition after pouring a potting composition into a case might be divided into a some division like FIG. For Preliminary Experimental Examples 4 to 10, as in Preliminary Experimental Examples 1 and 2, both ends of each trapezoidal partition member have a tapered shape, and are supported by the upper edge of the edge of the case. Partially partitioned in the depth direction from the exposed surface. For Preliminary Experimental Example 11, the partition material was brought into contact with the bottom surface of the case, and the entire potting composition was partitioned in the depth direction of the potting composition. For Preliminary Experimental Example 12, after preparing a partition material having the shape shown in FIG. 7E and filling the case with the potting composition, the partition material was exposed to the potting composition so that the partition material was positioned at the center of the case. Placed on the surface. In preliminary experiment example 13, no partition material was arranged.

<Filling and curing of potting composition>
The potting composition was poured into one compartment in the case that had been preheated to 60 ° C. The potting composition flowed smoothly from one compartment to the other. The pouring process was completed within 30 seconds. As shown in Table 5, the partition material was immersed at a depth of 1 mm to 10 mm or deeper than the surface of the potting composition. The minimum distance between the partition material and the case inner wall on the exposed surface of the potting composition was 0 mm in FIGS. 7A to 7C and 10 mm in FIG. 7D. For the partition pattern such as a lattice shape as shown in FIG. 7E, an insertion clearance necessary for arranging the partition member in the case was secured between the case inner wall and the outer frame of the partition member. The partition pattern of FIG. 7E is obtained by dividing the exposed surface of the potting composition into 12 parts. After pouring the potting composition, the case was placed in a convection oven and the potting composition was cured at 125 ° C. for 90 minutes.

<High temperature aging test>
The case containing the cured potting composition was stored and aged in a convection oven at 150 ° C., and the appearance was visually evaluated. Appearance was ranked according to the following criteria.
A: Cracks do not occur from the start of the test to 14 days B: Cracks occur from 7 to 13 days from the start of the test C: Cracks occur from 5 to 6 days from the start of the test D: Cracks within 4 days from the start of the test Occurs

<Result>
Table 5 shows the partition pattern of the partition material, the immersion depth and the material, the area and the number of the sections, and the results of the high temperature aging test.

<Example 1 and Comparative Example 1>
<Case, partition material and parts>
As a case, a rectangular tray-shaped aluminum case (wall thickness: 2 mm) having an external dimension of 110 mm × width 80 mm × height 45 mm was used. As the partition material, a 2 mm thick acrylic plate cut out was used. When the partition material was installed in the case, the potting composition part was partitioned by the thickness of the partition material. A toroidal coil having a diameter of 40 mm and a height of 30 mm was used as a part.

<Potting composition>
It was prepared in the same manner as in Preliminary Experimental Examples 1 to 3.

<Placement of parts>
In Example 1 and Comparative Example 1, as shown in FIG. 1, the toroidal coil was disposed at the center of the bottom surface of the aluminum case.

<Arrangement of partition material>
In Example 1, the partition material was arranged in the case so that the exposed surface of the potting composition after pouring the potting composition into the case was partitioned into two compartments as shown in FIG. 7B. The partition material was supported in contact with the upper surface of the toroidal coil. In Comparative Example 1, no partition material was arranged.

<Filling and curing of potting composition>
The potting composition was poured into one compartment in the case that had been heated to 60 ° C. in advance, and the case was completely filled with the potting composition. The potting composition flowed smoothly from one compartment to the other. The pouring process was completed within 30 seconds. The part toroidal coil was completely embedded in the potting composition. The partition material was immersed at an immersion depth of 10 mm from the surface of the potting composition. The minimum distance between the partition member and the case inner wall on the exposed surface of the potting composition was 0 mm. After pouring, the case was placed in a convection oven and the potting composition was cured at 125 ° C. for 90 minutes.

<High temperature aging test>
The case containing the cured potting composition was stored and aged in a convection oven at 160 ° C., and the appearance was visually evaluated. The appearance after 120 hours of the high temperature aging test was ranked according to the following criteria.
A: No crack B: Crack present, crack depth less than 10 mm C: Crack present, crack depth 10 mm or greater and less than 40 mm D: Crack present, crack depth 40 mm or greater (crack reaches the bottom of the case)

<Result>
Table 6 shows the partition pattern of the partition material, the immersion depth and the material, the area and the number of the sections, and the results of the high temperature aging test.

1 Part 2 Case 3, 31, 32 Partition material 4 Potting composition d Immersion depth D Depth of potting composition s Gap between case bottom and partition material

Claims (4)

Providing one or more parts, a case having an inner wall defining an interior space for housing the parts, and a potting composition;
Placing the component in the internal space of the case;
Arranging one or more partition members in the internal space of the case;
Filling the potting composition into a gap between the part and the inner wall of the case;
Curing the potting composition, filling the potting composition,
The partition material is at least partially immersed in the potting composition to partially partition the potting composition in the depth direction, and substantially partition the exposed surface of the potting composition into a plurality of compartments. This prevents or reduces the occurrence of cracks in the contact surface between the potting composition and the part and the inner wall of the case, the surface of the potting composition, and the interior after the potting composition is cured. And filling method of potting composition.   On the exposed surface of the potting composition, the minimum distance between the partition material and the inner wall of the case, the minimum distance between the partition materials, and the portion between the partition material and the part exposed from the potting composition of the part. The potting composition filling method according to claim 1, wherein the minimum distance is 10 mm or less. Providing one or more parts, a case having an inner wall defining an interior space for housing the parts, and a potting composition;
Placing the component in the internal space of the case;
Arranging one or more partition members in the internal space of the case;
Filling the potting composition into a gap between the part and the inner wall of the case;
Curing the potting composition to form an article filled with the potting composition, comprising the steps of:
The partition material is at least partially immersed in the potting composition to partially partition the potting composition in the depth direction, and substantially partition the exposed surface of the potting composition into a plurality of compartments. This prevents or reduces the occurrence of cracks in the contact surface between the potting composition and the part and the inner wall of the case, the surface of the potting composition, and the interior after the potting composition is cured. A method for producing an article filled with a potting composition.   On the exposed surface of the potting composition, the minimum distance between the partition material and the inner wall of the case, the minimum distance between the partition materials, and the portion between the partition material and the part exposed from the potting composition of the part. The method for producing an article filled with the potting composition according to claim 3, wherein the minimum distance is 10 mm or less.