JP2014234827A - Seal member, seal member manufacturing method, and seal method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal member difficult to fixedly attach to a sealed member, excellent in slidability, and low in cost.SOLUTION: A seal member 100 according to the present invention is a seal member interposed between a plurality of sealed members 200 and 210 and hermetically sealing a gap between the sealed members 200 and 210. The seal member 100 comprises a mixture containing not less than 80 wt% of thermoplastic elastomer and thermoplastic resin relative to entirety, the thermoplastic elastomer is contained at a rate of not less than 30 wt% and not more than 90 wt%, and a rate of an area by which the thermoplastic elastomer is exposed on a surface in contact with at least one of the plurality of sealed members 200 and 210 is not more than 30%.

Description

  The present invention relates to a sealing member, a manufacturing method thereof, and a sealing method.

  In various devices and apparatuses, a sealing member is frequently used for dust prevention, waterproofing, pressure resistance, and the like. Also, a seal member is used for the same purpose in buildings and containers.

  Generally, a sealing member is used by being compressed by being sandwiched between sealed portions to be sealed, and is required to be made of a material having a small compression set. Therefore, as disclosed in Patent Documents 1 and 2, rubber and elastomer are used as the material for the seal member.

JP 2010-169260 A JP 2003-173671 A

  However, when rubber or elastomer is used as a sealing material, there arises a problem that it adheres to the member to be sealed over time. Further, as used in doors and the like, there is a problem in that the sliding member has a high sliding resistance and easily wears in applications where the member to be sealed may slide relative to the sealing member.

  Patent Document 1 discloses a rubber seal member used in an environment in close contact with a metal in which a coating layer obtained by heat-treating a solution containing perhydropolysilazane and polyorganosilazane on the rubber surface is disclosed. However, it is expensive to form such a coating layer, and depending on the conditions of use, there may be cases where the required level of slidability is not reached.

  This invention is made | formed in view of this point, The place made into the objective is providing the sealing member which is hard to adhere to a to-be-sealed member, is excellent in slidability, and is cheap.

  The seal member of the present invention is a seal member that is sandwiched between a plurality of members to be sealed and seals between the members to be sealed, and is composed of a mixture containing at least 80% by mass of a thermoplastic elastomer and a thermoplastic resin, The thermoplastic elastomer is included in a ratio of 30% by mass or more and 90% by mass or less, and the area ratio where the thermoplastic elastomer is exposed on the surface in contact with at least one of the plurality of members to be sealed is It is characterized by being 30% or less. The thermoplastic resin here is a thermoplastic plastomer which is a concept opposite to a thermoplastic elastomer, and is a thermoplastic polymer compound having an elastic modulus at room temperature of 10 MPa or more. On the other hand, a thermoplastic elastomer is a high molecular compound which is thermoplastic and has an elastic modulus of 1 MPa or more and less than 10 MPa at room temperature. The mixture containing 80% by mass or more of the thermoplastic elastomer and the thermoplastic resin means that 80% by mass or more of the mixture is occupied by both the thermoplastic elastomer and the thermoplastic resin.

  A first manufacturing method of a sealing member of the present invention includes a sealing portion and a non-sealing portion, and is sandwiched between a plurality of sealing members to seal between the sealing members. The sealing portion is the non-sealing portion. A method for producing a seal member, which covers at least a part of the seal member and constitutes a surface with which at least one of the members to be sealed contacts, wherein the thermoplastic elastomer and the thermoplastic resin are 80% by mass or more of the total. A non-seal part forming step of forming the non-seal part with a mixture A containing the thermoplastic elastomer in a proportion of more than 50% by mass and 90% by mass or less, and a thermoplastic elastomer and a thermoplastic resin. And 80% by mass of the total, and the sealing portion is formed by the mixture B having a thermoplastic elastomer content of 50% by mass or less. Characterized in that it comprises a Lumpur portion forming step. In the present application, a portion made of the same material as the material constituting the surface including the surface that contacts the member to be sealed is referred to as a seal portion, and the other portion is referred to as a non-seal portion.

  The second manufacturing method of the sealing member of the present invention includes a sealing portion and a non-sealing portion, and is sealed between the sealing target members by being sandwiched between a plurality of sealing target members, and the sealing portion is the non-sealing portion. A method for producing a seal member, which covers at least a part of the seal member and constitutes a surface with which at least one of the members to be sealed contacts, wherein the thermoplastic elastomer and the thermoplastic resin are 80% by mass or more of the total. A non-seal part forming step of forming the non-seal part with a mixture A containing the thermoplastic elastomer in a proportion of more than 50% by mass and 90% by mass or less, and the seal part by a thermoplastic resin. And a seal part forming step to be formed.

  In a preferred embodiment, the seal portion constitutes only a part of the skin of the seal member.

  In a preferred embodiment, the non-seal portion forming step and the seal portion forming step are performed simultaneously.

  A third manufacturing method of a sealing member of the present invention includes a sealing portion and a non-sealing portion, and is sealed between a plurality of sealed members, and the sealing portion is the non-sealing portion. A method for producing a seal member, which covers at least a part of the seal member and constitutes a surface with which at least one of the members to be sealed contacts, wherein the thermoplastic elastomer and the thermoplastic resin are 80% by mass or more of the total. And the step of preparing a mixture A containing the thermoplastic elastomer in a proportion of more than 50% by mass and 90% by mass or less, and simultaneously forming the non-seal part and the seal part with the mixture A. A simultaneous formation step, wherein in the simultaneous formation step, the ratio of the area where the thermoplastic elastomer is exposed on the surface with which the member to be sealed contacts is 30 Characterized by the following.

  The sealing method of the present invention uses the above-described sealing member, and the sealed member includes a sliding sealed member that slides with the sealing member, and the non-seal portion is included in the sliding sealed member. It is characterized in that sealing is carried out by contacting them.

  The sealing member of the present invention reduces the exposed area of the thermoplastic elastomer on the surface in contact with the member to be sealed, and increases the blending amount of the thermoplastic elastomer in the non-contacting portion. It is difficult to stick and easy to slide.

2 is a schematic cross-sectional view illustrating Embodiment 1. FIG. (A) is typical sectional drawing explaining Embodiment 2, (b) is sectional drawing of a sealing member. FIG. 10 is a schematic cross-sectional view illustrating a modification of the second embodiment. (A) is typical sectional drawing explaining another modification of Embodiment 2, (b) is sectional drawing of a sealing member. (A) is typical sectional drawing explaining Embodiment 3, (b) is sectional drawing of a sealing member. (A) is typical sectional drawing explaining the modification of Embodiment 3, (b) is sectional drawing of a sealing member. (A) is typical sectional drawing explaining another modification of Embodiment 3, (b) is sectional drawing of a sealing member. 10 is a schematic cross-sectional view illustrating Embodiment 4. FIG. FIG. 10 is a schematic cross-sectional view illustrating a modification of the fourth embodiment. 10 is a schematic cross-sectional view illustrating Embodiment 5. FIG. 10 is a schematic cross-sectional view illustrating Embodiment 6. FIG. 10 is a schematic cross-sectional view illustrating Embodiment 7. FIG.

  The feature of the present invention is that a mixture of a thermoplastic resin E having rubber elasticity and a thermoplastic resin P having no rubber elasticity is used as a raw material, and the blending ratio of P is increased in a portion in contact with a member to be sealed. In the non-contact portion, the E blending ratio is increased. As a result, a large amount of P is exposed and a small amount of E is exposed on the seal surface, so that it can be prevented from adhering to the member to be sealed and the slidability with the member to be sealed can be improved. Further, since the body portion excluding the surface has a large amount of E and a small amount of P, it can be elastically deformed to maintain a good sealing property.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following drawings, components having substantially the same function are denoted by the same reference numerals for the sake of brevity.

(Embodiment 1)
As shown in FIG. 1, the sealing member according to the first embodiment is an O-ring having a circular cut surface, and is sandwiched between an upper sliding member to be sealed 200 and a lower sliding member 210 to be sealed. Touching. In the seal member 100 of the present embodiment, the seal portion 104 is formed on the entire surface around the non-seal portion 102 at the center portion, and the upper sliding seal member 200 and the lower sliding seal member are maintained in a sealed state. Used to slide with 210. The upper sliding sealed member 200 and the lower sliding sealed member 210 are made of carbon steel, stainless steel, aluminum (alloy) or other metals, ceramics or other inorganic materials, synthetic resins, etc., but the raw materials are not particularly limited. Not.

  The non-seal portion 102 of the seal member 100 is made of a mixture containing at least 80% by mass of both a thermoplastic elastomer and a thermoplastic resin (resin that is not a thermoplastic elastomer), and the thermoplastic elastomer is more than 50% by mass. It is contained at a ratio of 90% by mass or less. On the other hand, the seal portion 104 is made of a mixture containing 80% by mass or more of both a thermoplastic elastomer and a thermoplastic resin (resin that is not a thermoplastic elastomer), and the thermoplastic elastomer is contained in a proportion of 50% by mass or less. The area ratio at which the thermoplastic elastomer is exposed is 30% or less on the sealing surface, which is the surface in contact with the upper sliding sealed member 200 and the lower sliding sealed member 210. Thus, the sealing member 100 of this embodiment consists of a mixture containing 80 mass% or more of a thermoplastic elastomer and a thermoplastic resin. Moreover, the thermoplastic elastomer is contained in the ratio of 30 mass% or more and 90 mass% or less as the sealing member 100 whole.

  In the seal portion 104, the exposed area ratio of the thermoplastic elastomer on the seal surface is 30% or less, and the exposed area ratio of the thermoplastic resin or filler is 70% or more. The frictional force between the sliding member to be sealed 200 and the lower sliding member to be sealed 210 is small, and the wear resistance is increased. Further, since the non-seal portion 102 corresponding to the core of the seal member 100 contains the thermoplastic resin elastomer in a proportion of more than 50% by mass and 90% by mass or less, the elastomer contained in a large amount reduces the compression set. , The sealing performance becomes high. In addition, the exposed area ratio of the thermoplastic elastomer, the thermoplastic resin, or the like on the seal surface is calculated by observing the surface with a TEM.

  The thermoplastic elastomer in the present embodiment is a high molecular compound that is thermoplastic and has an elastic modulus of 1 MPa or more and less than 10 MPa at room temperature, and specifically, styrene (SBC), olefin (TPO), vinyl chloride ( TPVC), urethane (PU), ester (TPEE), amide (TPAE) and the like. One kind of thermoplastic elastomer may be selected and used from these, or a blend of a plurality of thermoplastic elastomers may be used.

  The thermoplastic resin in the present embodiment is a thermoplastic plastomer that is a concept opposite to a thermoplastic elastomer, and is a thermoplastic synthetic resin having an elastic modulus at room temperature of 10 MPa or more, specifically, an ABS resin, Polypropylene (PP), polyethylene (PE), polystyrene (PS), acrylic resin (PMMA), polyethylene terephthalate (PET), polyphenylene ether (PPE), polyamide (PA), polycarbonate (PC), polyacetal (POM), polybutylene Examples include terephthalate (PBT), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), liquid crystal polymer (LCP), fluororesin, and urethane resin. One type of thermoplastic resin may be selected and used from these, or a blend of a plurality of thermoplastic resins may be used.

  In the present embodiment, fillers such as inorganic or organic powders and fibers, and additives such as plasticizers and anti-aging agents may be added to the seal member 100.

  Next, the manufacturing method of the sealing member 100 of this embodiment is demonstrated.

  First, the material of the seal part 104 and the material of the non-seal part 102 are prepared. The material of the seal portion 104 is made of a mixture containing 80% by mass or more of a thermoplastic elastomer and a thermoplastic resin, and the thermoplastic elastomer is contained in a proportion of 50% by mass or less. The material of the non-seal part 102 consists of a mixture containing 80 mass% or more of a thermoplastic elastomer and a thermoplastic resin, and the thermoplastic elastomer is contained in a proportion of more than 50 mass% and 90 mass% or less.

  Using these materials, it is manufactured by an injection molding technique called so-called two-color molding. Specifically, first, the material of the non-seal part 102 is injection-molded into a first mold to produce only the non-seal part 102. Next, the non-seal part 102 is put in the second mold, and the seal member 100 is produced by coating the material of the seal part 104 around the periphery by injection molding. If the material on the surface of the second mold is a material having a higher affinity for the thermoplastic resin than the thermoplastic elastomer, the thermoplastic resin is more concentrated on the surface of the seal portion 104 than the thermoplastic elastomer. Thus, the surface area ratio can be different from the composition ratio of the seal portion 104. That is, even if the thermoplastic elastomer is 50% by mass in the composition ratio of the seal portion 104, the area ratio of the elastomer exposed on the surface can be 30%.

  As another manufacturing method, there is a method of simultaneously manufacturing the seal portion 104 and the non-seal portion 102. For example, the sealing member of this embodiment is prepared by using a method in which the material of the above-described sealing portion 104 and the material of the non-sealing portion 102 are prepared and injection-molded into one mold using separate injectors. 100 may be manufactured. At this time, if the material on the surface of the mold is a material having a higher affinity for the thermoplastic resin than the thermoplastic elastomer, the same effect as the above-described area ratio effect can be obtained.

  Furthermore, there is a method in which the seal portion 104 and the non-seal portion 102 are simultaneously manufactured by utilizing the difference in solidification temperature between the thermoplastic resin and the thermoplastic elastomer. The solidification temperature is a temperature at which a molten thermoplastic resin or thermoplastic elastomer starts to solidify due to loss of fluidity. In this case, only one type of material obtained by mixing a thermoplastic resin, a thermoplastic elastomer, and, if necessary, an additive can be used. For example, when the solidification temperature of a thermoplastic elastomer is lower than that of a thermoplastic resin, the mold is cooled so as to be lower than the solidification temperature of the thermoplastic elastomer. Therefore, when the molten material is injected into the mold, the mold First, the thermoplastic resin begins to solidify on the inner surface. Therefore, the area ratio of the thermoplastic resin on the surface of the seal portion 104 is larger than the mixing ratio of the thermoplastic resin in the material. Specifically, the material to be injected is composed of a mixture containing 80% by mass or more of a thermoplastic elastomer and a thermoplastic resin, and the thermoplastic elastomer is contained in this material in a proportion of more than 50% by mass and 90% by mass or less. Although it is included, the ratio of the area where the thermoplastic elastomer is exposed on the surface of the seal portion 104 after injection molding is 30% or less.

  The difference in the mixing ratio of the thermoplastic resin and the thermoplastic elastomer of the material and the area ratio of the thermoplastic resin and the thermoplastic elastomer appearing on the surface of the seal portion 104 are the types of the thermoplastic resin and the thermoplastic elastomer, and the respective solidifications. It depends on many parameters such as temperature, additives, mixing ratio, injection method, mold shape, mold temperature, etc. If these parameters are not designed precisely, the mixing ratio and area ratio will be greatly different. Absent.

  In the manufacturing method of the present embodiment, it is possible to easily and inexpensively manufacture a sealing member that is difficult to adhere to the member to be sealed, has excellent slidability, and is inexpensive.

(Embodiment 2)
The seal member according to the second embodiment is different in structure from the seal member 100 according to the first embodiment, and the member to be sealed is also partially different. Specifically, the seal member of this embodiment is an O-ring having the structure shown in FIG. 2, and an upper sliding sealed member 200 existing on the upper side and a lower non-sliding sealed member 310 existing on the lower side. Is in contact with both. That is, the lower sealed member is different from that of the first embodiment. Further, the seal member 110 of the present embodiment is different from that of the first embodiment in that the seal portion 114 exists only on the upper surface of the O-ring as shown in FIG.

  In the present embodiment, the upper sealed member slides with respect to the seal member 110, the lower sealed member does not slide, and the sealing portion 114 is provided only on the upper surface that contacts the upper sliding sealed member 200. Provided. The seal member 110 includes a non-seal portion 112 other than the seal portion 114 which is the upper skin of the O-ring. The non-seal portion 112 is in contact with the lower non-slidable sealed member 310.

  As in the first embodiment, the non-seal portion 112 is made of a mixture containing 80% by mass or more of a thermoplastic elastomer and a thermoplastic resin, and the thermoplastic elastomer has a ratio of more than 50% by mass and 90% by mass or less. Included. On the other hand, the seal portion 114 is made of a mixture containing 80% by mass or more of a thermoplastic elastomer and a thermoplastic resin, and the thermoplastic elastomer is contained in a proportion of 50% by mass or less. The ratio of the area where the thermoplastic elastomer is exposed is 30% or less on the sealing surface, which is the contact surface. As described above, the seal member 110 of the present embodiment is made of a mixture containing 80% by mass or more of a thermoplastic elastomer and a thermoplastic resin. Moreover, the thermoplastic elastomer is contained in the ratio of 30 mass% or more and 90 mass% or less as the whole sealing member 110.

  In the present embodiment, the raw material of the seal member 110 is the same as that of the first embodiment. The manufacturing method is the same as that in the first embodiment. In addition, the exposed area ratio of the thermoplastic elastomer may be larger than 30% on the contact surface with respect to the lower non-slidable member 310, but it is not necessary to consider wear because they do not slide with each other. The other effects are the same as those of the first embodiment, and the second embodiment also has the same effects.

-Modification 1-
A sealing member according to Modification 1 of Embodiment 2 is shown in FIG. The seal member 120 according to the modified example 1 is different from the seal member 110 in that the seal portion 124 is also provided on the lower surface side of the seal member 110 according to the second embodiment described with reference to FIG. is there. In other words, the seal member 120 of this modification is provided with the seal portions 124 on both the upper and lower surfaces of the non-seal portion 122 rich in the thermoplastic elastomer content. The lower sealed member is a lower sliding sealed member 210 that slides relative to the seal member 120.

  In this modification, the raw material of the seal member 120 is the same as that of the first embodiment. The manufacturing method is the same as that in the first embodiment. The same effects as those of the first embodiment are also exhibited in this modification.

-Modification 2-
A seal member according to Modification 2 of Embodiment 2 is shown in FIG. In the seal member 130 according to the second modification, the seal member 110 according to the second embodiment described above with reference to FIG. The inner non-slidable sealed member 330 is placed inside the circumference of the O-ring, and the outer sliding sealed member 220 is placed outside and seals between them. The point provided only on the right side surface of the drawing is different from the seal member 110. In other words, the sealing member 130 of this modification is provided with the sealing portion 134 on the side surface facing the outside of the non-sealing portion 132 rich in the thermoplastic elastomer content. Examples of the two sealed members 220 and 330 according to the present modification include a columnar piston placed inside a cylindrical cylinder.

  In this modification, the raw material of the seal member 130 is the same as that of the first embodiment. The manufacturing method is the same as that in the first embodiment. In addition, the same effect as that of the second embodiment which is not a modification is also exhibited in this modification.

(Embodiment 3)
The seal member according to the third embodiment is different in structure from the seal member 100 according to the first embodiment. Specifically, the seal member of the present embodiment has a U-shaped cross section structure shown in FIG. 5, and the U-shaped open portion (opening portion) is sandwiched between the two sealed members 220 and 230. It is designed to be sealed by receiving pressure so that it becomes narrow. The seal member 500 has a ring shape in which a groove having a U-shaped section faces an opening upward and a side surface is continuous in a circular shape. It is provided around. The seal portion 504 has a triangular cross section. In addition, a spring is inserted as a holding member 506 on the U-shaped inner surface side of the non-seal portion 502.

  The sealed members are an inner sliding sealed member 230 existing inside the circumferentially-structured sealing member 500, and an outer sliding sealed member 220 existing outside.

  In the present embodiment, the raw materials of the seal portion 504 and the non-seal portion 502 of the seal member 500 are the same as those in the first embodiment. The material of the holding member 506 is metal, synthetic resin, or the like. Further, the manufacturing method is the same as that of the first embodiment, and the holding member 506 may be attached after the seal part 504 and the non-seal part 502 are manufactured, or from the beginning when the non-seal part 504 is manufactured. It may be attached. Further, the same effects as those of the first embodiment are obtained.

-Modification 1-
A sealing member according to Modification 1 of Embodiment 3 is shown in FIG. In the seal member 510 according to the first modification, the seal member 500 according to the third embodiment described above with reference to FIG. 5 is sandwiched between the members to be sealed from the inside and outside of the circumference, and therefore the seal portion 504 is provided on the inner and outer surfaces. On the other hand, the seal member 514 is provided on the upper and lower sides of the circumference to perform the seal, which is different from the seal member 500. That is, the sealing member 510 of this modification has the same U shape as the sealing member 500 described above, but the U-shaped opening faces the outside of the circumference and the U-shaped bottom faces the inside of the circumference. ing. The upper sealed member is the upper sliding sealed member 200, and the lower sealed member is the lower non-sliding sealed member 310.

  In this modification, the raw materials of the seal part 514 and the non-seal part 512 of the seal member 510 are the same as those in the first embodiment. The material of the holding member 516 is a metal or a synthetic resin. The manufacturing method is the same as that of the sealing member 500 described above. The effect is also the same as that of the sealing member 500 described above.

-Modification 2-
A seal member according to Modification 2 of Embodiment 3 is shown in FIG. In the seal member 520 according to the second modification, the seal member 500 according to the third embodiment described above with reference to FIG. 5 is sandwiched between the members to be sealed from the inside and outside of the circumference, and therefore the seal portion 504 is provided on the inner and outer surfaces. On the other hand, the seal portion 524 is provided on the upper and lower sides of the circumference to perform the seal, which is different from the seal member 500. The seal member 510 according to the first modification is different from the seal member 510 in the opening direction of the U-shaped section. And the direction in which the bottom faces is opposite. Further, the member to be sealed is the same as that of the first modification, the upper member to be sealed is the upper sliding member to be sealed 200, and the lower member to be sealed is the lower non-sliding member 310 to be sealed.

  In this modification, the raw materials of the seal portion 524 and the non-seal portion 522 of the seal member 520 are the same as those in the first embodiment. The material of the holding member 526 is metal, synthetic resin, or the like. The manufacturing method is the same as that of the sealing member 500 described above. The effect is also the same as that of the sealing member 500 described above.

(Embodiment 4)
The seal member according to the fourth embodiment is different in shape from the seal member 100 according to the first embodiment. Specifically, the seal member of this embodiment is an O-ring having a rectangular cross section having the cross-sectional structure shown in FIG. 8, an upper sliding member 200 to be sealed on the upper side, and a lower non-sliding on the lower side. It is sandwiched between the sealed member 350 and is in contact with both. That is, the cross-sectional shape is different from that of the seal member 100 of the first embodiment, and the seal member 600 is entirely covered with the seal portion 604 around the non-sealed portion 602 having a rectangular cross section. The lower non-slidable sealed member 350 includes a recess into which a part of the seal member 600 is fitted.

  In the present embodiment, a part of the seal member 600 fits into the recess of the lower non-slidable member 350 and the upper slide member 200 slides relative to the seal member 600. The position to be fixed and sealed to the lower non-sliding sealed member 350 does not change.

  As in the first embodiment, the non-seal portion 602 is made of a mixture containing 80% by mass or more of a thermoplastic elastomer and a thermoplastic resin thermoplastic, and the thermoplastic elastomer has a ratio of more than 50% by mass and 90% by mass or less. Included. On the other hand, the seal portion 604 is made of a mixture containing at least 80% by mass of a thermoplastic elastomer and a thermoplastic resin, and the thermoplastic elastomer is contained at a rate of 50% by mass or less. The ratio of the area where the thermoplastic elastomer is exposed is 30% or less on the sealing surface, which is the contact surface. As described above, the seal member 600 according to the present embodiment is made of a mixture containing 80% by mass or more of a thermoplastic elastomer and a thermoplastic resin. Moreover, the thermoplastic elastomer is contained in the sealing member 600 as a whole at a ratio of 30% by mass to 90% by mass.

  In the present embodiment, the raw materials of the seal portion 604 and the non-seal portion 602 of the seal member 600 are the same as those in the first embodiment. The manufacturing method is the same as that in the first embodiment. The same effects as those of the first embodiment are also exhibited in the fourth embodiment.

-Modification-
FIG. 9 shows a seal member according to a modification of the fourth embodiment. In the seal member 610 according to the modification, in the seal member 600 according to the fourth embodiment described above with reference to FIG. 8, the seal portion 614 is provided only on the upper surface of the non-seal portion 612 that contacts the upper sliding member 200 to be sealed. This is different from the seal member 600.

  In the present modification, the raw materials of the seal part 614 and the non-seal part 612 of the seal member 610 are the same as those in the first embodiment. The manufacturing method is the same as that in the first embodiment. Further, the exposed area ratio of the thermoplastic elastomer may be larger than 30% on the contact surface with respect to the lower non-slidable member 350, but it is not necessary to consider wear because they do not slide with each other. Other effects are the same as those of the first embodiment with respect to this modification.

(Embodiment 5)
The seal member according to the fifth embodiment is different in shape and structure from the seal member 100 according to the first embodiment. Specifically, the seal member of the present embodiment is an O-ring having a cross-section having a cross-sectional structure shown in FIG. 10, and an upper sliding member 200 to be sealed on the upper side and a lower sliding surface on the lower side. It is sandwiched between the member to be sealed 210 and is in contact with both. In contact with the sealed members 200 and 210 are two protruding arms each having a cross shape. That is, the cross-sectional shape is different from that of the seal member 100 of the first embodiment, and the seal member 700 is provided with a seal portion 704 at the tip of each arm of the non-sealed portion 702 having a cross-shaped cross section.

  As in the first embodiment, the non-seal portion 702 is made of a mixture containing 80% by mass or more of a thermoplastic elastomer and a thermoplastic resin thermoplastic, and the thermoplastic elastomer has a ratio of more than 50% by mass and 90% by mass or less. Included. On the other hand, the seal portion 704 is made of a mixture containing at least 80% by mass of a thermoplastic elastomer and a thermoplastic resin, and the thermoplastic elastomer is contained at a rate of 50% by mass or less. The area ratio at which the thermoplastic elastomer is exposed on the sealing surface which is the surface in contact with the lower sliding member to be sealed 210 is 30% or less. As described above, the seal member 700 of the present embodiment is made of a mixture containing at least 80% by mass of a thermoplastic elastomer and a thermoplastic resin. Moreover, the thermoplastic elastomer is contained in the sealing member 700 as a whole at a ratio of 30% by mass to 90% by mass.

  In the present embodiment, the raw materials of the seal portion 704 and the non-seal portion 702 of the seal member 700 are the same as those in the first embodiment. The manufacturing method is the same as that in the first embodiment. The same effects as those of the first embodiment are also exhibited in the fifth embodiment.

(Embodiment 6)
The seal member according to the sixth embodiment is different in shape and structure from the seal member 100 according to the first embodiment. Specifically, the seal member of the present embodiment is an O-ring having a Y-shaped cross section having the cross-sectional structure shown in FIG. 11, and includes an inner sliding seal member 230 existing inside the circumference of the O-ring and an outer side. It is sandwiched between the existing non-sliding sealed member 320 and is in contact with both. Two Y-shaped protruding arms are in contact with the sealed members 230 and 320. That is, the cross-sectional shape is different from that of the seal member 100 of the first embodiment, and the seal member 710 of the present embodiment is provided with a seal portion 714 at the tip portions of the two arms of the non-sealed portion 712 having a Y-shaped cross section. Yes.

  As in the first embodiment, the non-seal portion 712 is made of a mixture containing 80% by mass or more of a thermoplastic elastomer and a thermoplastic resin thermoplastic, and the thermoplastic elastomer has a ratio of more than 50% by mass and 90% by mass or less. Included. On the other hand, the seal portion 714 is made of a mixture containing at least 80% by mass of a thermoplastic elastomer and a thermoplastic resin, and the thermoplastic elastomer is contained at a rate of 50% by mass or less, and is in contact with the members to be sealed 230 and 320. The ratio of the area where the thermoplastic elastomer is exposed is 30% or less on the sealing surface which is the surface to be processed. As described above, the seal member 710 of the present embodiment is made of a mixture containing at least 80% by mass of a thermoplastic elastomer and a thermoplastic resin. Moreover, the thermoplastic elastomer is contained in the ratio of 30 mass% or more and 90 mass% or less as the sealing member 710 whole.

  In the present embodiment, the raw materials of the seal part 714 and the non-seal part 712 of the seal member 710 are the same as those in the first embodiment. The manufacturing method is the same as that in the first embodiment. The same effects as those of the first embodiment are also exhibited in the sixth embodiment.

(Embodiment 7)
The seal member according to the seventh embodiment is different in shape and structure from the seal member 100 according to the first embodiment. Specifically, the seal member of this embodiment is an O-ring having a U-shaped cross section having the cross-sectional structure shown in FIG. And is in contact with both of them. The seal member 800 of the present embodiment has a shape in which the U-shaped opening faces upward and the upward groove is connected one round. The outer surfaces of the two side walls are in contact with the sealed members 230 and 220. That is, the cross-sectional shape is different from the seal member 100 of the first embodiment, and the seal member 800 of the present embodiment is provided with the seal portion 804 on the outer surface portion of the two side walls of the non-seal portion 802 having a U-shaped cross section. Yes.

  As in the first embodiment, the non-seal portion 802 is made of a mixture containing 80% by mass or more of a thermoplastic elastomer and a thermoplastic resin thermoplastic, and the thermoplastic elastomer is in a proportion of more than 50% by mass and 90% by mass or less. Included. On the other hand, the seal part 804 is made of a mixture containing 80% by mass or more of a thermoplastic elastomer and a thermoplastic resin, and the thermoplastic elastomer is contained in a ratio of 50% by mass or less and is in contact with the members to be sealed 230 and 220. The ratio of the area where the thermoplastic elastomer is exposed is 30% or less on the sealing surface which is the surface to be processed. As described above, the seal member 800 of the present embodiment is made of a mixture containing 80% by mass or more of a thermoplastic elastomer and a thermoplastic resin. Moreover, the thermoplastic elastomer is contained in the sealing member 800 as a whole at a ratio of 30% by mass to 90% by mass.

  In the present embodiment, the raw materials of the seal portion 804 and the non-seal portion 802 of the seal member 800 are the same as those in the first embodiment. The manufacturing method is the same as that in the first embodiment. The same effects as those of the first embodiment are also exhibited in the seventh embodiment.

(Embodiment 8)
The seal member manufacturing method according to the eighth embodiment has the same shape as that of the first embodiment and the same manufacturing procedure as that of the first embodiment. However, the material of the seal portion includes a thermoplastic elastomer. Only the absence is different from the first embodiment. The manufacturing method of the sealing member of this embodiment is as follows.

  First, a material for the seal part and a material for the non-seal part are prepared. The material of the seal portion is made of a thermoplastic resin. The material of the non-seal portion is made of a mixture containing 80% by mass or more of a thermoplastic elastomer and a thermoplastic resin, and the thermoplastic elastomer is contained in a proportion of more than 50% by mass and 90% by mass or less. As the thermoplastic resin and the thermoplastic elastomer, those described in Embodiment 1 can be used.

  Using these materials, it is manufactured by an injection molding technique called so-called two-color molding. Specifically, first, the material of the non-seal part is injection-molded into a first mold to produce only the non-seal part. Next, a non-seal part is put in the second mold, and the seal member is covered with the material of the seal part by injection molding to produce a seal member.

  The same effects as those of the first embodiment can be obtained in the seal member and the manufacturing method thereof according to the eighth embodiment. Moreover, the thermoplastic elastomer is contained in the ratio of 30 mass% or more and 90 mass% or less as the whole sealing member.

<Evaluation by sample>
Samples were prepared and evaluated as characteristics as seal members. The types of characteristics and their evaluation methods are as follows.

  Static friction coefficient: Evaluation was made using a sheet having a thickness of 2 mm (consisting of only the material of the seal portion). As a sealing member, it is necessary to be less than 0.5, and less than 0.5 was set as (circle) and 0.5 or more was set as x.

  Coefficient of dynamic friction: Evaluation was performed using a sheet having a thickness of 2 mm (consisting only of the material of the seal portion). The sealing member needs to be less than 0.2, and less than 0.2 is marked with ◯ and 0.2 or more is marked with ×.

  Abrasion amount: Evaluation was made by modifying a Taber tester described in JIS K 7204 (Abrasion test method using plastic wear wheel). Specifically, the Taber testing machine rotates the sample by pressing the wear wheel against the sample, but instead of the wear wheel, the tip surface of a metal (S45C) pin (φ8, surface roughness Ra 1.0) is used. A load of 0.5 MPa was applied and pressed against the sample, and the sample was rotated (rotation speed: 1.25 rotations / second, total rotation speed: 10,000 rotations), and the worn weight was measured. The sample was evaluated using a sheet having a thickness of 2 mm (consisting only of the material of the seal portion). Since the abrasion resistance is high when the worn weight is less than 5 mg, it was evaluated as ◯. Abrasion amount of 5 mg or more was marked as x.

  Compression set: Using a cylindrical sample of 30 mmφ × 15 mm height (10 mm high non-seal part is arranged at the center in the height direction, and seal parts are arranged 2.5 mm each on both sides thereof) Evaluation was performed by applying stress in the height direction. The sealing member is required to be less than 30%, and less than 30% is indicated by ◯, and 30% or more is indicated by ×.

  100% modulus: Using a sample of a 1 mm thick sheet formed by hot pressing so that the thickness ratio of the seal part / non-seal part / seal part is 1/4/1, and the shape of a JIS No. 4 dumbbell specimen. evaluated. The seal member needs to be larger than 15 MPa, and more than 15 MPa is indicated by ◯, and 15 MPa or less is indicated by ×.

  The composition in the seal part, the type of thermoplastic elastomer, the kind of thermoplastic resin, the kind and amount of additive, and the composition in the non-seal part, the kind of thermoplastic elastomer, the kind of thermoplastic resin, the kind and amount of additive Tables 1 and 2 show the changed samples and their evaluations.

  Among the samples, A1 to A19 are samples according to the example, and B1 to B5 are samples according to the comparative example. As shown in Tables 1 and 2, the samples according to the examples satisfy the necessary characteristic values in all of the dynamic friction coefficient, the static friction coefficient, the wear amount, the compression set, and the 100% modulus, but the samples according to the comparative examples. Is not suitable as a seal member because any of the characteristic values does not reach a required value.

(Other embodiments)
The above-described embodiment is an exemplification of the present invention, and the present invention is not limited to these examples, and these examples may be combined or partially replaced with known techniques, common techniques, and known techniques. Also, modified inventions easily conceived by those skilled in the art are included in the present invention.

  The shape of the seal member is not limited to the shape described in the above embodiment. In addition to the shape of the O-ring, any shape such as a linear shape or a planar shape may be used.

  The boundary between the seal part and the non-seal part may be clear or not. For example, when the seal portion has a structure in which the composition ratio of the thermoplastic elastomer and the thermoplastic resin changes in the thickness direction, the boundary between the seal portion and the non-seal portion can be unclear.

  As described above, the method for manufacturing a seal member according to the present invention can easily manufacture a seal member having excellent wear resistance, and is useful as a method for manufacturing a seal member used for a sliding portion. .

100 Seal member 102 Non-seal part 104 Seal part 110 Seal member 112 Non-seal part 114 Seal part 120 Seal member 122 Non-seal part 124 Seal part 130 Seal member 132 Non-seal part 134 Seal part 200 Upper side sliding sealed member 210 Lower side Sliding sealed member 220 Outer sliding sealed member 230 Inner sliding sealed member 310 Lower non-sliding sealed member 320 Outer non-sliding sealed member 330 Inner non-sliding sealed member 350 Lower non-sliding Sealed member 500 Seal member 502 Non-seal part 504 Seal part 510 Seal member 512 Non-seal part 514 Seal part 520 Seal member 522 Non-seal part 524 Seal part 600 Seal member 602 Non-seal part 604 Seal part 610 Seal member 612 Non-seal part 614 Seal 700 Seal Material 702 non-sealing portion 704 seals 710 seal member 712 non-sealing portion 714 seals 800 seal member 802 non-sealing portion 804 sealing portion

Claims (7)

A sealing member that is sandwiched between a plurality of sealed members to seal between the sealed members,
It consists of a mixture containing at least 80% by mass of thermoplastic elastomer and thermoplastic resin,
The thermoplastic elastomer is contained in a proportion of 30% by mass to 90% by mass,
A sealing member in which at least one of the plurality of members to be sealed comes into contact with an area ratio of 30% or less where the thermoplastic elastomer is exposed. A seal part and a non-seal part, and sandwiched between a plurality of seal target members to seal between the seal target members, wherein the seal part covers at least a part of the non-seal part and A method for producing a seal member, comprising at least one of the surfaces in contact with the seal member,
The non-seal portion is formed by the mixture A containing 80% by mass or more of the thermoplastic elastomer and the thermoplastic resin and containing the thermoplastic elastomer in a proportion of more than 50% by mass and 90% by mass or less. A non-seal portion forming step;
A seal part forming step that includes 80% by mass or more of the thermoplastic elastomer and the thermoplastic resin and that forms the seal part with the mixture B in which the content ratio of the thermoplastic elastomer is 50% by mass or less. Manufacturing method of member. A seal part and a non-seal part, and sandwiched between a plurality of seal target members to seal between the seal target members, wherein the seal part covers at least a part of the non-seal part and A method for producing a seal member, comprising at least one of the surfaces in contact with the seal member,
The non-seal portion is formed by the mixture A containing 80% by mass or more of the thermoplastic elastomer and the thermoplastic resin and containing the thermoplastic elastomer in a proportion of more than 50% by mass and 90% by mass or less. A non-seal portion forming step;
And a sealing part forming step of forming the sealing part with a thermoplastic resin.   The said sealing part is a manufacturing method of the sealing member described in Claim 3 which comprises only a part of skin of the said sealing member.   The method for manufacturing a seal member according to claim 2, wherein the non-seal portion forming step and the seal portion forming step are performed simultaneously. A seal part and a non-seal part, and sandwiched between a plurality of seal target members to seal between the seal target members, wherein the seal part covers at least a part of the non-seal part and A method for producing a seal member, comprising at least one of the surfaces in contact with the seal member,
A step of preparing a mixture A containing a thermoplastic elastomer and a thermoplastic resin in an amount of 80% by mass or more of the total, and the thermoplastic elastomer being contained in a proportion of more than 50% by mass and 90% by mass or less;
A simultaneous forming step of simultaneously forming the non-seal part and the seal part with the mixture A,
In the simultaneous forming step, the ratio of the area where the thermoplastic elastomer is exposed on the surface with which the member to be sealed contacts is 30% or less. A sealing method using the sealing member according to claim 1,
The sealed member includes a sliding sealed member that slides with the seal member,
A sealing method in which sealing is performed by bringing the non-seal portion into contact with the sliding member to be sealed.

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