WO2023127568A1 - Élément d'étanchéité et raccord - Google Patents

Élément d'étanchéité et raccord Download PDF

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Publication number
WO2023127568A1
WO2023127568A1 PCT/JP2022/046533 JP2022046533W WO2023127568A1 WO 2023127568 A1 WO2023127568 A1 WO 2023127568A1 JP 2022046533 W JP2022046533 W JP 2022046533W WO 2023127568 A1 WO2023127568 A1 WO 2023127568A1
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WO
WIPO (PCT)
Prior art keywords
mass
parts
rubber
sample
sealing member
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PCT/JP2022/046533
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English (en)
Japanese (ja)
Inventor
卓也 山下
辰雄 平林
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株式会社オートネットワーク技術研究所
住友電装株式会社
住友電気工業株式会社
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Application filed by 株式会社オートネットワーク技術研究所, 住友電装株式会社, 住友電気工業株式会社 filed Critical 株式会社オートネットワーク技術研究所
Publication of WO2023127568A1 publication Critical patent/WO2023127568A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases

Definitions

  • the present disclosure relates to seal members and connectors.
  • This application claims priority based on Japanese Patent Application No. 2021-215256 filed in Japan on December 28, 2021, and incorporates all the content described in the Japanese application.
  • Patent Literature 1 and Patent Literature 2 disclose connectors attached to panels. This connector is connected to a mating connector while attached to the panel.
  • the panel is, for example, an automobile door panel. Mounting holes are provided in the panel.
  • the connector and the mating connector are arranged with the panel sandwiched therebetween and fitted through the mounting hole.
  • the connector includes a housing, terminal fittings accommodated in the housing, and a panel seal member attached to the housing.
  • a panel seal member is positioned at the end of the housing opening to contact the panel when the connector is mounted to the panel.
  • the panel seal member is elastically sandwiched between the housing and the panel to provide a liquid-tight seal between the housing and the panel.
  • the panel seal member is a rubber seal member made of, for example, silicone rubber.
  • Patent Document 3 discloses a thermoplastic elastomer composition having a thermoplastic phase (T) and an elastomer phase (EL).
  • the elastomeric phase is rubber.
  • the thermoplastic phase includes thermoplastics (TP) and thermoplastic elastomers (TPE).
  • Thermoplastics are polyesters, polyamides or polyurethanes.
  • Thermoplastic elastomers are copolyester-based, polyamide-based or polyurethane-based TPEs.
  • the thermoplastic elastomer composition may contain a cross-linking agent for cross-linking the elastomeric phase.
  • the seal member of the present disclosure is consisting of an elastomer composition comprising a thermoplastic elastomer and an antiplasticizer;
  • the content of the antiplasticizer is 0.1 parts by mass or more and 15 parts by mass or less with respect to 100 parts by mass of the thermoplastic elastomer
  • the thermoplastic elastomer comprises rubber, thermoplastic polyester and a cross-linking agent,
  • the content of the thermoplastic polyester is 10 parts by mass or more and 70 parts by mass or less with respect to 100 parts by mass of rubber,
  • the content of the cross-linking agent is 0.1 parts by mass or more and 3 parts by mass or less with respect to 100 parts by mass of rubber.
  • FIG. 1 is a schematic diagram of a thermoplastic elastomer contained in an elastomer composition that constitutes a seal member according to an embodiment.
  • FIG. 2 is a diagram showing an example of a structural formula of a terphenyl compound used as an antiplasticizer in an elastomer composition that constitutes a seal member according to an embodiment.
  • FIG. 3 is a diagram showing another example of a structural formula of a terphenyl compound used as an antiplasticizer in the elastomer composition that constitutes the sealing member according to the embodiment.
  • FIG. 4 is a diagram showing still another example of a structural formula of a terphenyl compound used as an antiplasticizer in the elastomer composition that constitutes the seal member according to the embodiment.
  • FIG. 1 is a schematic diagram of a thermoplastic elastomer contained in an elastomer composition that constitutes a seal member according to an embodiment.
  • FIG. 2 is a diagram showing an example of a structural formula of
  • FIG. 5 is a diagram showing an example of a structural formula of a biphenyl compound used as an antiplasticizer in an elastomer composition that constitutes a sealing member according to an embodiment.
  • FIG. 6 is a diagram showing another example of a structural formula of a biphenyl compound used as an antiplasticizer in the elastomer composition that constitutes the sealing member according to the embodiment.
  • FIG. 7 is a schematic diagram showing a molten state of an elastomer composition that constitutes a sealing member according to an embodiment.
  • FIG. 8 is a schematic diagram showing a solidified state of the elastomer composition that constitutes the sealing member according to the embodiment.
  • FIG. 9 is a schematic diagram showing an attached state of the connector according to the embodiment.
  • FIG. 10 is a schematic perspective view of a housing included in the connector according to the embodiment, viewed from the front side.
  • 11 is a schematic perspective view of the housing shown in FIG. 10 as seen from the rear side.
  • 12 is a cross-sectional view taken along line XII-XII of FIG. 10.
  • FIG. 13 is a cross-sectional view showing the state of the seal member when the connector according to the embodiment is attached to the object.
  • FIG. 14 is a schematic diagram showing electric wires and terminal fittings in a cable with a connector provided with the connector according to the embodiment.
  • the sealing member is required to have excellent elastic properties from the viewpoint of ensuring sealing performance by elastic deformation of the sealing member. Specifically, the seal member is required to have a low compression set.
  • the material of the sealing member is typically rubber such as silicone rubber. Rubber is flexible and has a low compression set. However, rubber has poor moldability. Therefore, the use of thermoplastic elastomers has been studied as a substitute material for rubber.
  • thermoplastic elastomer is a composition containing rubber and a thermoplastic resin.
  • Thermoplastic elastomers have elasticity like rubber and can be molded by heating like thermoplastic resins.
  • thermoplastic elastomers are inferior in moldability to thermoplastic resins. Since thermoplastic elastomers contain rubber components, they have poor fluidity when heated and melted. If the fluidity is poor, the pressure for filling the thermoplastic elastomer into the mold becomes excessive, so that molding defects tend to occur during molding of the sealing member.
  • thermoplastic elastomers have a higher compression set than rubber.
  • the compression set of thermoplastic elastomers tends to increase. Therefore, a seal member made of a thermoplastic elastomer may not be able to ensure sufficient sealing performance when exposed to a high-temperature environment.
  • One object of the present disclosure is to provide a sealing member that has good moldability and excellent sealing properties.
  • the seal member of the present disclosure has good moldability and excellent sealability.
  • An antiplasticizer is a low-molecular compound that has a rigid molecular structure and a melting point or softening point lower than that of the thermoplastic resin contained in the thermoplastic elastomer.
  • An elastomer composition obtained by adding an antiplasticizer to a thermoplastic elastomer melts and exhibits fluidity when heated above the melting point of the thermoplastic resin.
  • the antiplasticizer melts or softens and acts as a lubricant to increase the fluidity of the elastomeric composition in the molten state.
  • the antiplasticizer exists in the thermoplastic resin in a solid state.
  • the antiplasticizer is dispersed in the thermoplastic resin to act as a reinforcing agent to improve the compression set of the elastomeric composition.
  • An anti-plasticizer has the effect of suppressing an increase in compression set in a high-temperature environment.
  • a sealing member is consisting of an elastomer composition comprising a thermoplastic elastomer and an antiplasticizer;
  • the content of the antiplasticizer is 0.1 parts by mass or more and 15 parts by mass or less with respect to 100 parts by mass of the thermoplastic elastomer,
  • the thermoplastic elastomer comprises rubber, thermoplastic polyester and a cross-linking agent,
  • the content of the thermoplastic polyester is 10 parts by mass or more and 70 parts by mass or less with respect to 100 parts by mass of rubber,
  • the content of the cross-linking agent is 0.1 parts by mass or more and 3 parts by mass or less with respect to 100 parts by mass of rubber.
  • the seal member of the present disclosure has good moldability and excellent sealability.
  • the reason for this is that it consists of an elastomeric composition containing a thermoplastic elastomer and an antiplasticizer.
  • the thermoplastic elastomer is a polyester-based thermoplastic elastomer containing rubber and thermoplastic polyester as main components.
  • the anti-plasticizer functions as a lubricant when the elastomer composition is melted, thereby increasing the fluidity of the elastomer composition in the melted state. can be done. Therefore, the moldability of the sealing member is improved.
  • the antiplasticizer functions as a reinforcing agent in the solidified state of the elastomer composition, thereby improving the compression set of the elastomer composition. be able to. Therefore, the sealing performance of the sealing member is improved.
  • the content of the antiplasticizer is 15 parts by mass or less, deterioration of moldability can be suppressed.
  • the rubber may be acrylic rubber.
  • a terphenyl compound or biphenyl compound can be used as an antiplasticizer.
  • the content of the terphenyl compound may be 1 part by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the thermoplastic elastomer.
  • the content of the biphenyl compound is within the above specific range, the effect as an anti-plasticizer is likely to be exhibited.
  • the housing has an opening and an annular end surrounding the perimeter of the opening;
  • the end portion is provided so as to face the object when the connector is attached to the object,
  • the sealing member may be annularly provided along the end so as to contact the object when the connector is attached to the object.
  • the sealing member according to the present embodiment stops water by being elastically deformed in contact with an object.
  • the sealing member of this embodiment is made of an elastomer composition containing a thermoplastic elastomer and an antiplasticizer. Since the seal member is made of a specific elastomer composition, it has good moldability and excellent sealability.
  • the thermoplastic elastomer 10 of this embodiment is a polyester thermoplastic elastomer containing rubber 11 and thermoplastic polyester 12 as main components.
  • the "main component" as used herein means that the total content of the rubber 11 and the thermoplastic polyester 12 in the thermoplastic elastomer 10 is 70% by mass or more.
  • the total content of rubber 11 and thermoplastic polyester 12 may be 80% by mass or more.
  • Polyester-based thermoplastic elastomers are excellent in heat resistance.
  • a known thermoplastic elastomer 10 can be used.
  • Thermoplastic polyester 12 functions as a hard segment of thermoplastic elastomer 10 .
  • Thermoplastic polyester 12 is a thermoplastic resin.
  • the thermoplastic polyester 12 is a component that mainly contributes to the moldability and heat resistance of the thermoplastic elastomer 10 .
  • Thermoplastic polyester 12 is selected, for example, from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), and polybutylene naphthalate (PBN). It is a polyester-based resin.
  • the type of thermoplastic polyester 12 is not particularly limited.
  • the cross-linking agent 13 is for cross-linking the rubber 11 .
  • the cross-linking agent 13 may be appropriately selected according to the type of rubber 11 .
  • crosslinker 13 is typically hexamethylenediamine carbamate (HMDAC).
  • the content of the cross-linking agent 13 may be appropriately selected according to the type and amount of the rubber 11 .
  • the content of the cross-linking agent 13 is 0.1 parts by mass or more and 3 parts by mass or less with respect to 100 parts by mass of the rubber.
  • the content of the cross-linking agent 13 may be 0.5 parts by mass or more and 2 parts by mass or less.
  • the thermoplastic elastomer 10 may further contain, as other components, at least one additive selected from, for example, plasticizers, antioxidants, fillers, and carbon black, if necessary.
  • the content of these additives is not particularly limited, but may be appropriately selected within a range that does not impair the properties of the thermoplastic elastomer 10 .
  • the total content of these additives may be, for example, 0 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of rubber.
  • Antiplasticizers have the function of improving the moldability and strength of thermoplastic elastomers.
  • An antiplasticizer is a low-molecular-weight compound with a rigid molecular structure and a melting or softening point lower than that of the thermoplastic polyester.
  • the "rigid molecular structure” referred to here is, for example, a structure having a biphenyl group or a terphenyl group.
  • low molecular weight refers to those having a molecular weight of 5,000 or less. The molecular weight may be 100 or more and 5000 or less, and further 200 or more and 4000 or less.
  • Specific compounds that function as antiplasticizers are, for example, terphenyl compounds and biphenyl compounds.
  • the melting point or softening point of the antiplasticizer is lower than the melting point of the thermoplastic polyester. Thereby, the moldability of the thermoplastic elastomer 10 can be improved.
  • the melting point or softening point of the antiplasticizer is, for example, 260° C. or lower.
  • the melting point or softening point of the antiplasticizer may further be 240° C. or lower, 220° C. or lower.
  • the higher the melting point or softening point of the antiplasticizer the higher the strength in a high-temperature environment. From the viewpoint of heat resistance, the melting point or softening point of the antiplasticizer may be, for example, above 60°C, above 80°C, or even above 100°C.
  • the melting point or softening point of the antiplasticizer may also be 120° C. or higher, 125° C. or higher, 180° C. or higher, or 200° C. or higher.
  • the melting point or softening point of the antiplasticizer may be, for example, greater than 100°C to 260°C, 120°C to 240°C, 125°C to 220°C.
  • a terphenyl compound is a compound having a structure in which two phenyl groups as substituents are bonded to the central benzene ring.
  • terphenyl compounds There are three types of terphenyl compounds, ortho-terphenyl (o-terphenyl), meta-terphenyl (m-terphenyl), and para-terphenyl (p-terphenyl), depending on the bonding position of the phenyl group. be.
  • FIG. 2 shows the structural formula of o-terphenyl.
  • FIG. 3 shows the structural formula of m-terphenyl.
  • FIG. 4 shows the structural formula of p-terphenyl.
  • the melting point of o-terphenyl is 58°C to 59°C.
  • the melting point of m-terphenyl is 89°C.
  • the melting point of p-terphenyl is 213°C to 214°C.
  • the type of terphenyl compound may be p-terphenyl from the viewpoint of heat resistance.
  • a biphenyl compound is a compound having a structure in which two phenyl groups are covalently bonded with a single bond.
  • a phenol-based curing agent for example, can be used as the biphenyl compound.
  • a phenol-based curing agent is, for example, a biphenyl aralkyl-type phenol resin.
  • FIG. 5 shows an example of a structural formula of a biphenylaralkyl-type phenolic resin. In the structural formula shown in FIG. 5, n is a positive integer.
  • Specific examples of commercially available biphenylaralkyl-type phenolic resins having the structural formula shown in FIG. "KAYAHARD GPH-103" and "KAYAHARD GPH-65" differ in the number of n.
  • n is an integer of 3 to 5.
  • the biphenyl compound is not limited to the above examples, and may be a monomolecular compound.
  • An example of a monomolecular biphenyl compound is 3,3′,5,5′-Tetrakis(methoxymethyl)-[1,1′-biphenyl]-4,4′-diol. This compound is commercially available from Honshu Kagaku Kogyo under the product name "TMOM-BP”.
  • Another example is 2-propenoic acid, [1,1'-biphenyl]-4,4'-diylbis(oxy-2,1-ethanediyl)ester. This compound is commercially available from Honshu Kagaku Kogyo under the product name "A-BP-2EO".
  • the content of the antiplasticizer is 0.1 parts by mass or more and 15 parts by mass or less with respect to 100 parts by mass of the thermoplastic elastomer.
  • the content of the antiplasticizer is 0.1 parts by mass or more, the effect of improving moldability and strength can be obtained. If the antiplasticizer is contained excessively, the moldability is rather lowered. Therefore, the upper limit of the content of the antiplasticizer is set to 15 parts by mass.
  • the content of the antiplasticizer may be 1 part by mass or more and 15 parts by mass or less with respect to 100 parts by mass of the thermoplastic elastomer.
  • the content of the antiplasticizer may be 1 part by mass or more and 10 parts by mass or less.
  • Moldability here indicates how difficult it is for molding defects to occur during molding.
  • Molding defects are appearance defects such as flow marks or burrs. If no molding defects occur, it can be said that the moldability is good. If molding defects occur, it can be said that the moldability is poor. Good or bad moldability depends on the fluidity of the elastomer composition when melted. If the fluidity of the elastomer composition is high, even if the filling pressure to the mold is low, even the details of the mold can be easily filled. Since the filling pressure does not become excessive, molding defects such as flow marks and burrs are less likely to occur. On the other hand, if the fluidity of the elastomer composition is low, it is necessary to increase the filling pressure into the mold. As a result, the filling pressure becomes excessively high, and molding defects tend to occur.
  • the content of the anti-plasticizer may be appropriately selected according to the type of compound used as the anti-plasticizer.
  • the antiplasticizer is a terphenyl compound
  • the content of the terphenyl compound is 0.1 parts by mass or more and 10 parts by mass or less, and further 1 part by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the thermoplastic elastomer.
  • the antiplasticizer is a biphenyl compound
  • the content of the biphenyl compound is 0.1 parts by mass or more and 10 parts by mass or less, further 1 part by mass or more and 10 parts by mass or less, particularly 5 parts by mass with respect to 100 parts by mass of the thermoplastic elastomer. Parts or more and 10 mass parts or less may be sufficient.
  • FIG. 7 shows the state in which the elastomer composition has been heated and melted.
  • illustration of rubber contained in the thermoplastic elastomer is omitted.
  • the antiplasticizer 20 is present in the molten thermoplastic polyester 12 in a molten or softened state.
  • the molten or softened antiplasticizer 20 functions as a lubricant to enhance the fluidity of the elastomer composition in the molten state.
  • the seal member of the present embodiment made of the specific elastomer composition described above has good moldability and excellent sealability.
  • the shape of the sealing member is not particularly limited, and may be appropriately selected according to the application of the sealing member.
  • the shape of the seal member can be a desired shape selected from, for example, plate-like, ring-like, cylindrical, and block-like.
  • a method selected from, for example, injection molding and extrusion molding can be used.
  • the sealing member is suitable for waterproofing various products such as connectors and cases.
  • a connector-equipped cable 1 shown in FIG. 9 includes a connector 2 and a cable 3 .
  • the connector 2 is attached to the object.
  • the object is panel 8 .
  • This panel 8 is a panel that constitutes the body of the automobile.
  • a through hole 80 is provided in the panel 8 .
  • the connector 2 is arranged in the engine room.
  • the connector 2 is attached to the panel 8 so as to close the through hole 80 .
  • the connector 2 is connected to the mating connector 9 while attached to the panel 8 .
  • the connector 2 and the mating connector 9 are arranged with the panel 8 interposed therebetween and fitted through the through hole 80 .
  • the housing 4 is made of an insulating material such as resin.
  • the housing 4 is made of PBT.
  • the sub-housing (not shown) is also made of an insulating material such as PBT.
  • thermoplastic elastomer that constitutes the elastomer composition is a polyester-based thermoplastic elastomer.
  • a polyester-based thermoplastic elastomer has excellent adhesion to PBT.
  • the seal member 41 is very difficult to come off from the housing 4 .
  • an annular rib 41r is provided along the inner circumference of the seal member 41 on the inner peripheral surface 41i of the tip portion 41A.
  • a plurality of ribs 41r are provided on the inner peripheral surface 41i.
  • the plurality of ribs 41r are formed stepwise from the tip side of the inner peripheral surface 41i toward the side near the end portion 40e.
  • the rib 41r comes into close contact with the panel 8 when the distal end portion 41A is deformed in a direction away from the axis 40s shown in FIG. As a result, the sealing performance between the housing 4 and the panel 8 is improved.
  • the number of ribs 41r may be singular.
  • Identification and quantification of each component contained in the elastomer composition can be performed as follows. A sample of the elastomer composition is placed in acetone to separate the insolubles from the solubles.
  • the acetone-insoluble matter includes rubber components such as ACM and resin components such as polyester resins.
  • the recovered acetone-insoluble matter is put into hexafluoroisopropanol (HFIP) to separate the insoluble matter and the soluble matter.
  • HFIP insolubles include rubber components.
  • the HFIP solubles include resin components. The rubber components are identified and quantified by analyzing the HFIP insolubles.
  • the resin components are identified and quantified by analyzing the HFIP solubles.
  • sample No. 10 to sample no. Fourteen elastomer compositions were prepared.
  • Sample no. No. 10 uses the thermoplastic elastomer as it is.
  • Sample no. 11 to sample no. No. 14 is obtained by adding a resin to a thermoplastic elastomer. The added resin is liquid crystal polymer (LCP) or PBT.
  • Sample no. 11 and sample no. No. 12 added LCP as an additive resin.
  • Table 1 shows sample no. 11 to sample no. 14 shows the type and amount of added resin.
  • the added amount of the additive resin means the added amount with respect to 100 parts by mass of the thermoplastic elastomer.
  • Fluidity was evaluated by measuring the MVR of the elastomer composition in a molten state using a flow tester.
  • As the flow tester “CFT-500D” manufactured by Shimadzu Corporation was used.
  • the temperature of the elastomer composition was 260°C.
  • the MVR per minute was determined when the molten elastomer composition was extruded through a hole having a diameter of 1 mm and a length of 2 mm under a predetermined load.
  • the extrusion load was 20 kg.
  • Table 2 shows the measurement results of the MVR of each sample. A higher MVR means higher fluidity.
  • the compression set of the elastomer composition was measured according to JIS K 6262:2013.
  • the elastomer composition of each sample was molded to prepare test specimens.
  • the test piece is a large test piece described in JIS K 6262:2013.
  • the large test piece is a cylinder with a diameter of 29.0 mm and a thickness of 12.5 mm.
  • the compression set was obtained after holding the test piece compressed at a predetermined compression ratio in an environment of 120° C. for 1000 hours. The compression ratio was set to 25%.
  • the evaluation of the compression set is based on the sample No. Table 2 shows the improvement rate relative to 10.
  • the improvement rate is the sample No.
  • the compression set of 10 divided by the compression set of each sample, expressed as a percentage.
  • the improvement rate is more than 100%, the compression set of sample No. Since the compression set is smaller than that of sample No. 10, It means that the compression set was improved with respect to 10.
  • the improvement rate is less than 100%, the compression set is the sample No. Since it is larger than the compression set of sample no. It means that the compression set is worse than 10.
  • Sample No. 1 to sample no. 5 and sample no. 10 to sample no. The moldability and sealability of the seal members molded from the 14 elastomer compositions were evaluated.
  • Moldability was evaluated as follows. A sealing member was produced by molding the elastomer composition of each sample. In this test, the sealing member and the housing were integrally molded by two-color molding to produce a housing with the sealing member.
  • the housing is the housing 4 shown in FIGS. 10 and 11, as described in the (housing) item of ⁇ connector> of the embodiment.
  • the appearance of the sealing member was visually observed to confirm the presence or absence of molding defects such as flow marks or burrs. When there was no molding defect, the moldability was evaluated as "A”. When there was a molding defect, the moldability was evaluated as "B".
  • Sample No. 1 which is a thermoplastic elastomer added with an antiplasticizer, 1 to sample no.
  • the MVR of the elastomer composition No. 5 is the same as that of sample No. 5 using the thermoplastic elastomer as it is. greater than the MVR of 10 elastomer compositions. Therefore, sample no. 1 to sample no.
  • the elastomer composition of sample no. Higher fluidity compared to No. 10 elastomer composition.
  • Sample no. 1 to sample no. 5 has an MVR of 10.0 cc/min or more, and moreover 12.0 cc/min or more, and has very high fluidity. From these results, it can be seen that adding an antiplasticizer to a thermoplastic elastomer improves the fluidity of the elastomer composition.
  • the elastomer composition of No. 14 was sample no. Higher fluidity compared to No. 10 elastomer composition. Therefore, by adding an antiplasticizer to the thermoplastic elastomer, the fluidity of the elastomer composition can be enhanced. However, the effect of improving the fluidity by the added resin is smaller than the effect of improving the fluidity by the antiplasticizer. For example, sample no. 3, sample no. 4 and sample no. 11, sample no. 13, sample no. 3, sample no. 4 has higher liquidity. Therefore, the effect of improving fluidity by the antiplasticizer is greater than the effect of improving fluidity by the added resin.
  • sample No. 1 to sample no From the evaluation results of compression set shown in Table 2, sample No. 1 to sample no.
  • the compression set improvement rate of the elastomer composition No. 5 is 110% or more, and further 120%. Therefore, sample no. 1 to sample no.
  • the compression set of the elastomer composition of sample No. 5 is improved compared to the compression set of the elastomer composition of No. 10. From this result, it can be seen that the compression set of the elastomer composition can be improved by adding an antiplasticizer to the thermoplastic elastomer.
  • An elastomer composition containing a thermoplastic elastomer and an antiplasticizer can suppress an increase in compression set. Therefore, as shown in the moldability evaluation results in Table 2, sample No. 1 to sample no.
  • the sealing member made of the elastomer composition of No. 5 has excellent sealing properties.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
  • Sealing Material Composition (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

La présente invention concerne un élément d'étanchéité qui comprend une composition élastomère contenant un élastomère thermoplastique et un antiplastifiant, la teneur en antiplastifiant étant de 0,1 partie en masse à 15 parties en masse pour 100 parties en masse de l'élastomère thermoplastique, l'élastomère thermoplastique contenant du caoutchouc, du polyester thermoplastique et un agent de réticulation, la teneur en polyester thermoplastique étant de 10 parties en masse à 70 parties en masse pour 100 parties en masse de caoutchouc, et la teneur en agent de réticulation étant de 0,1 partie en masse à 3 parties en masse pour 100 parties en masse de caoutchouc.
PCT/JP2022/046533 2021-12-28 2022-12-16 Élément d'étanchéité et raccord WO2023127568A1 (fr)

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JP2021-215256 2021-12-28
JP2021215256A JP2023098470A (ja) 2021-12-28 2021-12-28 シール部材、及びコネクタ

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WO2023127568A1 true WO2023127568A1 (fr) 2023-07-06

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