JPWO2012161099A1 - Seal member and composite seal member - Google Patents

Abstract

The seal member (11) is used for the battery lid (12) fitted into the housing (13) of the device. The seal member (11) has a compression set (JIS K6262 (ISO 815)) of 5% or less measured under a condition of standing at 70 ° C. for 22 hours at a compression rate of 50 to 80% and a penetration (JIS). K2220 (ISO2137)) is made of a silicone gel molded body having a range of 60 to 130. The sealing member (11) enhances the sealing between the battery lid (12) and the housing (13) to prevent water from entering the battery (111) or the like inside the device, and the battery lid (12) The case (13) is prevented from being deformed or damaged.

Description

  The present invention relates to a sealing member and a composite sealing member for sealing between components such as a casing, a case, and a substrate of an electronic device.

  In recent years, the demand for portable electronic devices such as mobile phones, portable audio players, digital cameras, and digital video cameras has increased. Many functions are added to these portable electronic devices, and the use environment of the portable electronic devices is also expanding. For example, a portable electronic device may be used in a place where it gets wet with water in daily life or leisure. In response to these needs, a waterproof function is added to portable electronic devices in order to prevent water droplets and dust from entering the devices.

  For example, in Patent Documents 1 and 2, an annular seal member made of rubber or thermoplastic elastomer is provided between parts such as a case and a lid that form the housing in order to prevent water droplets and dust from entering the housing. The configuration is described.

  Patent Document 3 discloses a connector that is connected to another electronic device via a cable. The connector is provided with a connector cover to protect it from dust. In this case, in order to add a waterproof function to the connector, a seal member is provided inside the connector cover.

  Furthermore, in the foldable portable terminal disclosed in Patent Document 1, a first casing and a second casing that are divided into two via a hinge part are connected by a flexible printed circuit board. Further, a waterproof function is added around the hinge portion by sandwiching the flexible printed circuit board with the packing.

  On the other hand, as portable electronic devices are becoming smaller and thinner, it is required to reduce the load on the casing by the sealing member in order to prevent deformation and breakage of the casing. For this reason, a low hardness material is used for the seal member.

JP 2005-032752 A JP 2008-288174 A JP 2001-250629 A

  The objective of this invention is providing the sealing member which can suppress the load to components, such as a housing | casing to which a sealing member is attached, having a more excellent waterproof function.

  In order to solve the above-described problems, according to a first aspect of the present invention, there is provided a seal member that is compressed by a first member and a second member to seal between the first member and the second member. The seal member has a compression set of 5% or less measured at 70 ° C. for 22 hours at a compression rate of 50 to 80% in accordance with JIS K6262 (ISO815), and JIS K2220 (ISO2137). It consists of a silicone gel molded body having a penetration of 60 to 130 measured according to the above.

  According to this configuration, the compression set (JIS K6262 (ISO 815)) measured under conditions of standing at 70 ° C. for 22 hours at a compression rate of 50% to 80% is made of a silicone gel molded body having a compression rate of 5% or less. In a state where the seal member is compressed by the first member and the second member, the seal member generates a strong elastic force in a direction opposite to the compression direction and tries to return to the original shape. On the other hand, since the penetration (JIS K2220 (ISO 2137)) of the silicone gel molded body is in the range of 60 to 130, it is extremely flexible compared to the rubber-like elastic body and is necessary for the first member and the second member. No more pressure is applied. Therefore, even if the sealing member is incorporated between the first member and the second member, the first member and the second member are not deformed or damaged. Moreover, the adhesiveness outstanding with respect to the 1st member and the 2nd member can also be exhibited.

  The “first member” and the “second member” mean, for example, a casing, a case component, a lid component, a cover component, a circuit board, an electronic component such as an IC chip, a connector, and a battery in a portable electronic device. . In addition, the first member and the second member may be the same member (relation between the housing and the housing), or different members (relation between the cover component and the battery, the relationship between the cover component and the connector, the case, It may be a relationship between a component and an electronic component).

  In the above sealing member, the silicone gel molded body preferably has self-adhesiveness.

  According to this configuration, since the silicone gel molded body has self-adhesiveness, the sealing member made of the silicone gel molded body can be easily attached to the first member and the second member. In addition, self-adhesive means the property which can be affixed on a 1st member or a 2nd member irrespective of the presence or absence of the pressurization with respect to a sealing member.

  In the above-described seal member, the seal member is preferably made of an annular silicone gel molded body.

  According to this structure, since a silicone gel molded object is cyclic | annular, it can be used similarly to an O-ring, packing, etc. Therefore, high sealing performance can be obtained in a wide range of applications.

  In the above sealing member, the sealing member is preferably composed of at least two or more types of silicone gel molded bodies having different penetrations, and is configured by laminating at least two or more types of silicone gel molded bodies.

  According to this configuration, since at least two or more types of silicone gel molded bodies having different penetrations are laminated, the penetration degree and thickness of each of the plurality of laminated silicone gel molded bodies has waterproof performance. Can be different. Therefore, the handleability of the seal member can be adjusted.

  For example, if a thin silicone gel molded body with a penetration of 60 is laminated on a silicone gel molded body with a penetration of 130, a high flexibility of the silicone gel molded body with a penetration of 130 is imparted to the seal member. Can do. Thereby, the ease of handling by the silicone gel molded object of the relatively hard penetration 60 can be improved, maintaining the followability to the 1st member and the 2nd member of a sealing member.

  In order to solve the above-described problem, according to a second aspect of the present invention, there is provided a composite seal member configured by integrating the above-described seal member and at least one of the first member and the second member. The

  Since the composite seal member is formed by integrating the seal member of the present invention and at least one of the first member and the second member, the process of attaching the seal member to the first member or the second member can be omitted, and workability is improved. Will improve.

  In this case, the first member and / or the second member (hereinafter referred to as “first and second members”) integrated with the seal member may be made of metal or resin.

  When the first and second members are metal, the metal first and second members are inserted into a mold for molding the seal member, and the first and second members are integrated with the seal member by insert molding. can do. That is, since the first and second members are not deformed or discolored by the pressure or heat at the time of molding the seal member, a high-quality composite seal member can be manufactured. Further, since the first and second members are metal, the rigidity of the seal member can be increased even if the first and second members are thin. Therefore, the composite seal member is easier to handle than the seal member alone.

  On the other hand, when the first and second members are resin, the first and second members can be integrated by being bonded or fused to the silicone gel molded body constituting the seal member. Further, since the first and second members are made of resin, the rigidity of the seal member can be increased while suppressing the manufacturing cost. Therefore, the composite seal member is easier to handle than the seal member alone.

  In order to solve the above problems, according to a third aspect of the present invention, there is provided a composite seal member in which the above-described seal member is integrally formed on the surface of a resin film.

  According to this configuration, since the seal member is integrally formed on the surface of the resin film, it becomes easier to handle than the case of the seal member alone. Therefore, it becomes easy to attach the composite seal member to the first member, the second member, or the like.

The perspective view which looked at the battery cover which applied the sealing member which concerns on 1st Embodiment of this invention, and the mobile telephone from which the battery cover was removed from the back. FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. Sectional drawing of the mobile telephone with which the battery cover was attached. Sectional drawing of the battery cover which concerns on the modification of 1st Embodiment. Sectional drawing of the mobile telephone with which the battery cover of FIG. 4 was attached. The perspective view which shows the connector cover of the mobile telephone to which the sealing member which concerns on 2nd Embodiment of this invention is applied. Sectional drawing which shows the connector cover attached to a mobile telephone. The top view which looked at the connector cover which concerns on the modification of 2nd Embodiment from the inner side. FIG. 9 is a cross-sectional view taken along line 9-9 of FIG. The disassembled perspective view which shows the case article to which the sealing member which concerns on 3rd Embodiment of this invention is applied. The fragmentary sectional view which expands and shows a seal structure. Sectional drawing of the seal structure which concerns on the modification of 3rd Embodiment. The top view which shows the sealing component to which the sealing member which concerns on 4th Embodiment of this invention is applied. Sectional drawing which shows the sealing components attached to the opening part of a housing | casing. FIG. 15 is a sectional view taken along line 15-15 in FIG. 13; The perspective view explaining the waterproof test in an Example. Sectional drawing explaining the waterproof test in an Example.

[First Embodiment]
Hereinafter, a first embodiment in which a sealing member of the present invention is applied to a battery lid of a mobile phone will be described with reference to FIGS.

  As shown in FIGS. 1 to 3, the mobile phone 110 includes a housing 13 as a second member and a battery lid 12 as a first member attached to and detached from the housing 13. A seal member 11 is provided on the back surface 12 a of the battery lid 12 in order to prevent water from entering the battery 111, electrical connection parts (not shown), and the like in the housing 13. A wall portion 12 b protrudes from the back surface 12 a of the battery lid 12. The wall portion 12 b is formed in an annular shape along the outer edge of the battery lid 12. The seal member 11 is provided so as to surround the outer periphery of the wall portion 12b.

  A mounting portion 12 c is formed on the outer edge of the battery lid 12. A claw portion (not shown) is formed on the back surface 12 a of the battery lid 12. The battery lid 12 is fitted into the housing 13 by the attachment portion 12c and the claw portion. When the battery lid 12 is fitted into the housing 13, the seal member 11 is compressed by the battery lid 12 and the housing 13. This structure prevents water from entering the battery 111 in the mobile phone 110.

  Instead of the above configuration, a composite seal member in which the seal member 11 and the battery lid 12 are integrated may be used. The composite seal member is formed by either molding the seal member 11 or the battery lid 12 and then inserting the molded product into a mold for molding the other of the seal member 11 or the battery lid 12 to perform insert molding. It is manufactured by doing. In this case, the process of attaching the seal member 11 to the battery lid 12 is omitted in the assembly work of the mobile phone 110.

  Note that the first embodiment may be modified as follows.

  In the first embodiment, the annular seal member 11 is provided on the outer periphery of the wall portion 12b protruding from the back surface 12a of the battery lid 12. However, as shown in FIGS. 4 and 5, the annular seal member 14 is replaced with the battery lid. You may affix directly on the back surface 15a of 15.

  An annular seal member 14 is affixed to the back surface 15 a of the battery lid 15. When the battery lid 15 is attached to the housing 16, the sealing member 14 is compressed by the battery lid 15 and the housing 16, and water intrusion into the battery 111 in the mobile phone 110 is prevented.

Moreover, it can replace with said structure and can also use the composite sealing member with which the sealing member 14 and the battery cover 15 were integrated. The composite sealing member is formed by either molding the sealing member 14 or the battery lid 15 and then inserting the molded product into a mold for molding the other of the sealing member 14 or the battery lid 15 to insert molding. It is manufactured by doing. In this case, in the assembling work of the mobile phone 110, the step of attaching the seal member 14 to the battery lid 15 is omitted.
Second Embodiment Hereinafter, a second embodiment in which the sealing member 21 of the present invention is applied to a connector cover 22 of an electronic device (for example, a mobile phone) 210 will be described with reference to FIGS. 6 and 7.

As shown in FIGS. 6 and 7, the mobile phone 210 is provided with a connector cover 22 as a “first member” that protects the connector 211. The seal member 21 is provided inside the connector cover 22. The connector 211 is a part that is connected to another electronic device via a cable or connected to a charger. The mobile phone 210 includes a housing 23 as a “second member”. In the housing 23, a circuit board 212, a connector 211, and the like are accommodated. The housing 23 is provided with an opening 23 a for exposing the connector 211.

  The connector cover 22 includes a cover part 213 that covers the connector 211 and a connection part 214 that extends from the end of the cover part 213. A fixing portion 215 that is fixed inside the housing 23 is provided at the end of the connection portion 214. The connector cover 22 is formed of a thermoplastic elastomer. Since the connector cover 22 has flexibility, it can be easily bent. The cover portion 213 is attached to the housing 23 through the fixing portion 215 so that the opening portion 23a can be opened and closed. An annular protrusion 216 that protrudes toward the connector 211 is provided on the inner surface of the cover part 213. The annular protrusion 216 is fitted along the inner wall of the opening 23a. The connector cover 22 is provided with an annular seal member 21 so as to surround the outer periphery of the annular protrusion 216.

  When the opening 23 a is closed by the connector cover 22, the seal member 21 is compressed by the annular protrusion 216 and the inner wall of the opening 23 a, and water intrusion into the connector 211 and the circuit board 212 is prevented.

  Note that the second embodiment may be modified as follows.

In the second embodiment, the annular seal member 21 is provided on the connector cover 22. However, as shown in FIGS. 8 and 9, a sheet-like seal member 31 may be attached to the inner surface of the connector cover 32. In this case, the connector cover 32 is provided with an annular protrusion 316 as in the second embodiment. The seal member 31 is formed so as to cover the annular protrusion 316. When the opening 23 a is closed by the connector cover 32, the seal member 31 on the inner side surface 313 a of the cover 313 is compressed by the cover 313, the connector 211, and the housing 23, and the connector 211 and the circuit board 212 are connected. Infiltration of water is prevented.
[Third Embodiment]
Hereinafter, a third embodiment in which the composite seal member 45 of the present invention is applied to a seal member 41 integrated with a resin film 44 will be described with reference to FIG.

  As shown in FIG. 10, the seal member 41 is compressed by a lower case 42 as a “first member” and an upper case 43 as a “second member” constituting the case article. Seal between 43. The composite seal member 45 is formed in a rectangular ring shape that coincides with the outer peripheral edges of the cases 42 and 43. As shown in FIG. 11, the seal member 41 has an annular raised portion 41a and a flat portion 41b. The cross-sectional shape of the annular raised portion 41a is an ellipse. The flat portion 41b is a portion formed thinner than the annular ridge 41a on the inner edge side of the annular ridge 41a. The resin film 44 is integrally formed with the seal member 41. The inner peripheral edge portion of the resin film 44 extends inward from the flat portion 41b. On the other hand, the outer peripheral edge portion of the resin film 44 is embedded in the annular raised portion 41a. The cross-sectional shape of the annular raised portion 41a may be a circle, a rounded rectangle, a rounded triangle, or the like.

  The resin film 44 is thinner than the seal member 41. As a material of the resin film 44, for example, PE, PP, PET, PBT, PC, PEN, PI, PMMA and the like are used. The thickness of the resin film 44 is, for example, 50 μm to 300 μm. By integrating the resin film 44 with the seal member 41 made of a silicone gel molded body, the handleability of the seal member 41 can be improved. Moreover, the sealing member 41 and the resin film 44 can be easily integrated with an adhesive, a primer, or the like. Moreover, you may integrate the sealing member 41 and the resin film 44 by the self-adhesiveness which the sealing member 41 has. Alternatively, the resin film 44 may be inserted into a mold for molding the seal member 41, and the seal member 41 may be integrally formed with the resin film 44 by insert molding. When the sealing member 41 and the resin film 44 are integrally formed, it is preferable to use a resin film having excellent heat resistance such as PI, PEN, PET, PBT.

  As shown in FIG. 10, the resin film 44 is formed in a rectangular shape. The corner portions of the resin film 44 are formed wider than the width of other portions. One insertion hole 44 a is formed at each corner of the resin film 44. The insertion hole 44a is formed to correspond to the attachment hole 42c of the lower case 42. An attachment shaft (not shown) of the upper case 43 passes through the insertion hole 44 a of the resin film 44 and enters the attachment hole 42 c of the lower case 42. In this state, the upper and lower cases 43 and 42 are coupled to each other by fitting or screwing.

  As shown in FIG. 11, the lower case 42 has a groove 42a into which the annular ridge 41a is fitted. The composite seal member 45 is attached to the lower case 42 by fitting the annular ridge 41a into the groove 42a. The annular protruding portion 41a protrudes above the upper surface 42b of the lower case 42 in a state where the annular protruding portion 41a is mounted in the groove portion 42a.

  By joining the upper case 43 to the lower case 42 to which the composite seal member 45 is mounted, the seal member 41 is compressed by the lower case 42 and the upper case 43, and the space between the cases 42 and 43 is sealed. Intrusion of water into the case article is prevented.

  Note that the third embodiment may be modified as follows.

  In the third embodiment, the composite sealing member 45 is formed by integrating the sealing member 41 with the resin film 44. However, as shown in FIG. 12, the annular sealing member 46 is a lower case as a “first member”. 47 may be attached directly. In this case, the seal member 46 is integrally formed with the lower case 47. As shown in FIG. 12, the seal member 46 is compressed by a lower case 47 constituting the case article and an upper case 48 as a second member to seal between the cases 47 and 48.

  The seal member 46 is formed in a rectangular ring shape that coincides with the outer peripheral edges of the cases 47 and 48. The cross-sectional shape of the annular raised portion 46a may be a circle, a rounded rectangle, a rounded triangle, or the like other than an ellipse. The annular raised portion 46a protrudes above the upper surface 47b of the lower case 47 in a state where the annular raised portion 46a is mounted in the groove portion 47a.

By connecting the upper case 48 to the lower case 47 to which the seal member 46 is attached, the seal member 46 is compressed by the lower case 47 and the upper case 48, and the case 47, 48 is sealed to form a case. Intrusion of water into the article is prevented.
[Fourth Embodiment]
Hereinafter, a fourth embodiment in which the sealing member 62 of the present invention is applied to a sealing component 61 that closes the opening 611 of the electronic device 610 will be described with reference to FIGS. 14 to 16.

  As shown in FIG. 14, the sealing component 61 is attached to the electronic device 610 so as to cover the wiring 612 exposed from the opening 611. The sealing component 61 is made of a metal plate or the like. A plate-like seal member 62 is fixed to the lower surface of the sealing component 61. The sealing component 61 and the housing 63 are respectively formed with holes into which screws 64 for fixing the sealing component 61 and the housing 63 are inserted.

  By assembling the sealing component 61 (first member) on which the seal member 62 is mounted to the housing 63 (second member) using a screw 64 or the like, the opening 611 and the wiring 612 of the housing 63 are connected. Sealing by the seal member 62 prevents water from entering the housing.

  Hereinafter, the above embodiments may be modified as follows.

  In the third embodiment, the seal member 41 is integrated with the resin film 44 to form the composite seal member 45, but the seal members 11, 14, 21, 31, and 62 in other embodiments are also integrated with the resin film. Thus, a composite seal member may be formed.

  In each of the above embodiments, at least one of the first member and the second member may be integrated with the seal member. In this case, the first and second members integrated with the seal member may be formed of metal or resin. Further, the first and second members may be integrated using a primer or an adhesive.

  When the first and second members are metal, the first and second members made of metal are inserted into a mold for molding the seal member, and the first and second members are integrated with the seal member by insert molding. be able to. That is, the first and second members are not deformed or discolored depending on the pressure or heat at the time of molding the seal member, so that a high-quality composite seal member can be manufactured. Further, since the first and second members are metal, the rigidity of the seal member can be increased even if the first and second members are thin. Therefore, the composite seal member is easier to handle than the seal member alone.

  On the other hand, when the first and second members are resin, the first and second members can be integrated by being bonded or fused to the silicone gel molded body constituting the seal member. Moreover, since the first and second members are made of resin, the rigidity of the sealing member can be increased while suppressing the manufacturing cost. Therefore, the composite seal member is easier to handle than the seal member alone.

  In the third embodiment, the sealing member may be a composite sealing member integrated with a metal plate or a resin plate instead of the composite sealing member 45 integrated with the resin film 44. Also with this configuration, the handleability of the seal member can be improved. Further, a metal plate or a resin plate integrated with the seal member may be a part of the first member or the second member, or may be joined to the first and second members. By doing so, even if it is difficult to attach the seal member because the shapes of the first and second members are complicated, it is possible to cope with it.

  Next, features of the sealing member of the present invention will be described.

  The seal member of the present invention is compressed by the first member and the second member, and seals between the first member and the second member. The seal member is made of a silicone gel molded body.

  The silicone gel molded body has a characteristic that the compression set measured according to JIS K6262 (ISO815) which is a Japanese industrial standard is 5% or less. Here, the compression set is a compression set measured at a compression rate in the range of 50% to 80% under conditions of standing at 70 ° C. for 22 hours. In particular, the numerical range of 50% to 80% compression rate is not meaningful. That is, it means that the compression set has a characteristic that the compression set is 5% or less even in the range of 50 to 80% where the compression amount is large.

  Moreover, the penetration of the silicone gel molded body is in the range of 60 to 130. Here, as specified in JIS K6249, the penetration is a value measured under a 25 ° C. condition by a consistency test using a ¼ cone according to JIS K2220 (ISO 2137). It shows that a silicone gel molded object is so soft that a penetration is large. As an index of softness (hardness), there is hardness defined by JIS K6253 (ISO7619) in addition to the above. However, in this case, the hardness of the silicone gel molded body shows a value of almost zero as an index according to type E defined by JIS K6253 (ISO7619).

  Excellent waterproof effect is exhibited even if only one of the two properties of the compression set of the silicone gel molded body is 5% or less and the penetration is in the range of 60 to 130 is satisfied. Not. That is, it is meaningful to have both of the above characteristics instead of either one.

  That is, since the compression set of the silicone gel molded body which is the seal member of the present invention is 5% or less, the seal member is compressed by the first member and the second member, and is in the direction opposite to the compression direction. It produces a strong elastic force and tries to return to its original shape. Moreover, since the penetration of the silicone gel molded body is in the range of 60 to 130, the sealing member is very soft and easily adheres to the first member and the second member, and the first member and the second member Does not cause deformation or damage. Further, since the compression set is 5% or less, the dimensional stability is excellent, and problems such as molding defects are hardly caused.

  If the penetration is less than 60, there is a possibility that the compression load for obtaining the compression rate (about 30%) necessary for forming the sealed structure may increase, and the first member or the second member may be deformed or damaged. May occur. On the other hand, when the penetration exceeds 130, it becomes difficult to handle the seal member, and it becomes difficult to use it at the opening and closing part.

  The silicone gel molded body has a tensile fracture strength specified by JIS K6251 (ISO37) of 0.05 MPa to 0.15 MPa, and a tensile fracture elongation specified by JIS K6251 (ISO37) of 230 to 400%. It is in. Since it has such physical properties, the silicone gel molded body has shape retention and can be molded into a three-dimensional shape. For example, in a case where two sheets of the same sealing member are prepared and an electronic component such as an IC chip, a connector, or a flexible circuit board is sandwiched between them, the sealing member is not simply formed flat. And can be three-dimensionally formed in accordance with the shape of the electronic component.

  The silicone gel molded body can have self-adhesiveness. In this case, the seal member made of the silicone gel molded body can be easily attached to the first and second members. As long as it is a silicone gel molded body having a penetration of 60 to 130, the seal member can have self-adhesiveness unless a non-adhesive treatment is performed. If non-adhesive treatment is performed, a seal member having no self-adhesiveness can be obtained. Examples of the non-adhesion treatment include coating with a thin film, coating with a coating film, and coating with powder.

  The silicone gel molded body is made of, for example, a two-component addition reaction curable organopolysiloxane. As the two-component addition reaction curable organopolysiloxane, an organopolysiloxane having a vinyl group is used as the A material, and an organopolysiloxane having an Si—H group is used as the B material. The silicone gel molded body is formed by filling an organopolysiloxane mixed with two liquids into a mold and then heating and curing. Furthermore, you may press with a press machine and shape | mold a silicone gel molded object. Moreover, you may shape | mold a silicone gel molded object by extrusion molding or injection molding (LIM: Liquid Injection olding).

  The shape and size of the seal member made of the silicone gel molded body are set according to the shape and size of the electronic device to which the seal member is attached, the first member, and the second member, respectively.

  The waterproof performance of the seal member satisfies IPX8 in the protection class (IP code) defined in JIS C0920 (international standard IEC / EN60529), which is one of the standards regarding the waterproofness of electronic devices. When the electronic device satisfies IPX8, which is a stricter condition than IPX7, even if the electronic device is submerged for a long time, water intrusion into the electronic device can be avoided.

  Further, the sealing member of the present invention may be constituted by laminating at least two kinds of silicone gel molded bodies having different penetrations. For example, if a thin silicone gel molded body with a penetration of 60 is laminated on a silicone gel molded body with a penetration of 130, a high flexibility of the silicone gel molded body with a penetration of 130 is imparted to the seal member. Can do. Thereby, the ease of handling by the silicone gel molded body having a relatively hard penetration of 60 can be imparted to the seal member while maintaining the followability of the seal member to the first and second members. That is, by having different penetration and thickness for each of the laminated silicone gel molded bodies while having waterproof performance, the handleability of the sealing member alone can be improved.

  Next, the sealing member of the present invention will be further described using examples.

  An organopolysiloxane having a vinyl group (hereinafter referred to as “A material”) is used as the A material, and an organopolysiloxane having an Si—H group (hereinafter referred to as “B material”) is used as the B material. And a two-component addition reaction curable organopolysiloxane composition (hereinafter referred to as a “silicone composition”) prepared by blending parts B and B in parts by weight of Table 1. Then, using a vacuum defoamer, the two-component addition reaction type silicone composition was stirred and mixed so as not to generate bubbles. As the silicone composition, silicone compositions manufactured by Asahi Kasei Wacker Silicone Co., Ltd., Toray Dow Corning Co., Ltd., and Momentive Co., Ltd. can be used. Materials A and B were procured from the above manufacturers, and materials were selected and blended so as to obtain the desired penetration and compression set. For example, trade names 613A (A material) and 613B (B material) manufactured by Asahi Kasei Wacker Silicone Co., Ltd. can be used. In samples 1 to 7 in Table 1, the same A material and B material were used, and only the blending ratio of the A material and B material was changed. In the sample 8, unlike the materials A and B in the samples 1 to 7, the material was selected so that the compression set exceeded 10%. Next, the prepared silicone composition was filled in a mold having a predetermined shape and cured under conditions of 110 ° C. for 10 minutes to produce a silicone gel molded body.

シール部材を製造する前に、予め測定規格に準じた形状のシリコーンゲル成形体を成形し、以下の項目を測定した。

Before producing the sealing member, a silicone gel molded body having a shape conforming to the measurement standard was molded in advance, and the following items were measured.

[Penetration]
As specified in JIS K6249, the penetration was measured under a 25 ° C. condition by a consistency test using a ¼ cone according to JIS K2220 (ISO 2137). The results are shown in the “Penetration” column of Table 1.

(Compression set)
In accordance with JIS K6262 (ISO815), compression set was measured under the condition of being left at 70 ° C. for 22 hours for compression ratios of 50%, 60%, 70% and 80%, respectively. The results are shown in the “compression set” column of Table 1. The numbers in parentheses in the “compression set” column indicate the compression rate conditions.

[Tensile test]
Based on JIS K6251 (ISO37), the tensile fracture strength and the tensile fracture elongation were respectively measured under 25 ° C conditions. The results are shown in the “Tensile Fracture Strength” column and “Tensile Fracture Elongation” column of Table 1.

[Manufacture of seal members and waterproof test]
In order to use the silicone composition in a waterproof test, the sealing member 51 was manufactured by forming into an annular disk shape. For each sample, an annular disk-shaped sealing member 51 having a thickness of 1.0 mm, an outer diameter of 39 mm, and an inner diameter of 21 mm (in other words, a width of 9 mm) was manufactured.

  As shown in FIGS. 16 and 17, the seal member 51 is disposed on the lower resin plate 52 as a “first member”, and the cobalt chloride paper P is disposed on the inner peripheral side of the seal member 51. Cobalt chloride paper P changes color when it contacts water. An upper resin plate 53 as a “second member” is superposed on the lower resin plate 52, and bolts 54 are inserted into holes 52 a of the lower resin plate 52 and holes 53 a of the upper resin plate 53 via steel washers 55. Insert the nut 56 and screw the nut 56 onto the tip of the bolt 54. Thus, a jig in which the seal member 51 was sandwiched at a predetermined compression rate was produced. Here, the compression rate was set to 10%, 20%, and 30% by changing the thickness of the washer 55. For example, an acrylic plate is used as the resin plate.

  In accordance with JIS C0920 (IPX8), a jig having a compression rate of each sample as shown in Table 1 was immersed in water at a water depth of 1.8 m and 25 ° C. to perform a waterproof test. And after leaving for 30 minutes, the presence or absence of discoloration of the cobalt chloride paper was confirmed, and the presence or absence of water immersion was confirmed. “10%”, “20%”, and “30%” in the “Waterproof Test” column of Table 1 represent the compression ratio of the seal member 51. In the waterproof test, “OK” represents that the cobalt chloride paper was not discolored, and “NG” represents that the cobalt chloride paper was discolored.

  In the sealing members of Samples 2 to 6, water was prevented from entering the sealing member under all conditions of the waterproof test, and a result was obtained that the waterproof member had excellent waterproof performance. This is presumably because the compression set was 5% or less within the compression rate range of 50% to 80% and the penetration was within the range of 60 to 130.

  On the other hand, in the sealing member of Sample 1, in a waterproof test with a compression rate of 30%, it was confirmed that the part of the sealing member was inundated. This is considered to be because the penetration was as high as 150, very flexible, and the tensile fracture strength was low.

  In the seal member of Sample 7, since the penetration was as low as 48, the compression load at a compression rate of 30% was higher than that of other samples. Therefore, the load on the first and second members is increased, and the thinner the first and second members are as the device is made thinner, the higher the possibility of deformation and breakage. In the seal member of sample 8, the compression set was 17 to 20%, which was higher than those of samples 2 to 6. For this reason, water immersion was confirmed in each waterproof test with a compression rate of 10% and 20%.

In order to solve the above-described problems, according to a first aspect of the present invention, there is provided a seal member that is compressed by a first member and a second member to seal between the first member and the second member. The seal member has a compression set of 5% or less measured at 70 ° C. for 22 hours at a compression rate of 50 to 80% in accordance with JIS K6262 (ISO815), and JIS K2220 (ISO2137). It consists of a silicone gel molded body having a penetration of 62 to 130 measured according to the above.

According to this configuration, the compression set (JIS K6262 (ISO 815)) measured under conditions of standing at 70 ° C. for 22 hours at a compression rate of 50% to 80% is made of a silicone gel molded body having a compression rate of 5% or less. In a state where the seal member is compressed by the first member and the second member, the seal member generates a strong elastic force in a direction opposite to the compression direction and tries to return to the original shape. On the other hand, since the penetration (JIS K2220 (ISO 2137)) of the silicone gel molded body is in the range of 62 to 130, it is extremely flexible compared to the rubber-like elastic body and is necessary for the first member and the second member. No more pressure is applied. Therefore, even if the sealing member is incorporated between the first member and the second member, the first member and the second member are not deformed or damaged. Moreover, the adhesiveness outstanding with respect to the 1st member and the 2nd member can also be exhibited.

According to this configuration, since the seal member is integrally formed on the surface of the resin film, it becomes easier to handle than the case of the seal member alone. Therefore, it becomes easy to attach the composite seal member to the first member, the second member, or the like.
In the above sealing member, the first member and the second member are any of a housing, a case part, a lid part, a cover part, a circuit board, an IC chip, a connector, and a battery, and are made of metal or resin. Is preferred.

Claims (6)

A seal member that is compressed by the first member and the second member to seal between the first member and the second member;
According to JIS K6220 (ISO 2137), the compression set measured at 70 ° C. for 22 hours at a compression rate of 50 to 80% according to JIS K6262 (ISO 815) is 5% or less, and according to JIS K2220 (ISO 2137). A sealing member comprising a silicone gel molded body having a measured penetration of 60 to 130. The seal member according to claim 1,
A sealing member, wherein the silicone gel molded body has self-adhesiveness. The seal member according to claim 1 or 2,
The seal member is made of a silicone gel molded body having an annular shape. In the sealing member according to any one of claims 1 to 3,
The seal member is composed of at least two or more types of the silicone gel molded bodies having different penetrations, and is configured by laminating the at least two or more types of silicone gel molded bodies. 5. A composite seal member comprising the seal member according to claim 1 and at least one of the first member and the second member integrated with each other. A composite seal member, wherein the seal member according to any one of claims 1 to 4 is integrally formed on a surface of a resin film.

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