WO2017073405A1 - Élément élastomère et élément d'étanchéité pour machines-outils - Google Patents

Élément élastomère et élément d'étanchéité pour machines-outils Download PDF

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Publication number
WO2017073405A1
WO2017073405A1 PCT/JP2016/080840 JP2016080840W WO2017073405A1 WO 2017073405 A1 WO2017073405 A1 WO 2017073405A1 JP 2016080840 W JP2016080840 W JP 2016080840W WO 2017073405 A1 WO2017073405 A1 WO 2017073405A1
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Prior art keywords
weight
sheet
machine tool
urethane
coolant
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PCT/JP2016/080840
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English (en)
Japanese (ja)
Inventor
勇喜 阿部
岩崎　成彰
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バンドー化学株式会社
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Priority to CN201680061044.2A priority Critical patent/CN108137770B/zh
Priority to JP2016564279A priority patent/JP6197128B1/ja
Publication of WO2017073405A1 publication Critical patent/WO2017073405A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/08—Protective coverings for parts of machine tools; Splash guards
    • B23Q11/0875—Wipers for clearing foreign matter from slideways or slidable coverings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain

Definitions

  • the present invention relates to an elastomer member and a machine tool seal member.
  • Machine tools such as lathes and machining centers are the most basic mechanical devices widely used in the manufacturing industry.
  • seal members such as a lip seal, a slide seal, a telescopic seal, and a cover seal are used to protect the drive mechanism and the like from chips and coolant (cutting oil).
  • a sealing member for machine tools a sealing member having a supporting member and an elastic member integrated with the supporting member is known.
  • Such seal members are made of chloroprene rubber (CR), acrylonitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), styrene butadiene rubber (SBR), ethylene / propylene diene monomer (EPDM) It has been proposed to use a rubber material such as polyurethane or an elastic material such as polyurethane (for example, see Patent Document 1).
  • CR chloroprene rubber
  • NBR acrylonitrile rubber
  • H-NBR hydrogenated nitrile rubber
  • SBR styrene butadiene rubber
  • EPDM ethylene / propylene diene monomer
  • the machine tool seal member is a member for protecting the drive mechanism from coolant or the like. Therefore, the elastic member of the sealing member for machine tools is exposed to the coolant during use. The elastic member exposed to the coolant is gradually swollen by the coolant. As a result, the sealing member for machine tools cannot perform its function and needs to be replaced. Moreover, when the elastic member containing an additive is exposed to a coolant, the said additive may elute. As a result, the physical properties of the elastic member may change, and the function of the machine tool seal member may not be achieved.
  • the coolant is roughly classified into a water-insoluble cutting oil and a water-soluble cutting oil, and both have different characteristics.
  • the elastic member of the conventional sealing member for machine tools is (a) one that swells or elutes easily with water-soluble cutting oil even if it is difficult to swell and dissolve with water-insoluble cutting oil, or ( b) Even if it is difficult to swell and dissolve with water-soluble cutting oil, only water-soluble cutting oil easily swells or dissolves. That is, an elastic member that hardly swells and dissolves in both water-insoluble cutting oil and water-soluble cutting oil has not been known so far.
  • the present inventors have intensively studied to solve such a problem, it is difficult to swell to any coolant of water-insoluble cutting oil and water-soluble cutting oil, or the additive is difficult to elute,
  • the present invention has been completed by finding an elastomer member that can be suitably used for a machine tool using a coolant.
  • the elastomer member of the present invention comprises a cured product of a thermosetting polyurethane composition
  • the thermosetting polyurethane composition contains a polyol component, an isocyanate component and a crosslinking agent, and the polyol component is a polyethylene adipate ester polyol.
  • PEA polyethylene adipate ester polyol
  • the elastomer member is made of a cured product of a thermosetting urethane composition having a JIS-A hardness of 67 ° or more, it swells and dissolves in any water-insoluble cutting water or water-soluble cutting oil. It ’s hard. Therefore, it can be suitably used for a machine tool that uses coolant.
  • the sealing member for machine tools of the present invention is a sealing member for machine tools comprising a supporting member and an elastic member integrated with the supporting member, wherein the elastic member is composed of the elastomer member of the present invention.
  • the elastic member is made of the elastomer member of the present invention which is difficult to swell or elute by the coolant. Therefore, the sealing member for machine tools is not easily deteriorated even when exposed to the coolant, and can maintain excellent sealing performance for a long period of time.
  • the elastomer member of the present invention has excellent durability against cutting oil (coolant) regardless of water-insoluble cutting oil or water-soluble cutting oil. Since the sealing member for machine tools of this invention consists of the elastomer member of this invention, it can maintain the outstanding sealing performance over a long period of time.
  • FIG.1 (a) is a top view which shows an example of the sealing member for machine tools which concerns on embodiment of this invention
  • FIG.1 (b) is a side view of Fig.1 (a).
  • Fig.2 (a) is a reverse view which shows another example of the sealing member for machine tools which concerns on embodiment of this invention
  • FIG.2 (b) is a side view of Fig.2 (a).
  • FIG. 4A is a graph showing the immersion time and the weight increase rate when the sheet prepared in the example is immersed in the coolant A (50 ° C.), and
  • FIG. 4B is the sheet prepared in the comparative example.
  • FIG. 5A is a graph showing the immersion time and the weight increase rate when the sheet prepared in the example is immersed in the coolant B (50 ° C.)
  • FIG. 5B is the sheet manufactured in the comparative example.
  • FIG. 6A is a graph showing the immersion time and the rate of weight increase when the sheet prepared in the example is immersed in the coolant C (50 ° C.)
  • FIG. 6B is the sheet manufactured in the comparative example.
  • the elastomer member which concerns on embodiment of this invention consists of hardened
  • the said thermosetting urethane composition contains a polyol component, an isocyanate component, and a crosslinking agent, and the said polyol component is a polyethylene adipate ester polyol (PEA). Since the said elastomer member is a hardened
  • PEA polyethylene adipate ester polyol
  • the PEA preferably has a number average molecular weight of 1000 to 3000.
  • An elastomer member using PEA having a number average molecular weight within the above range can more reliably prevent intrusion of chips, coolant, and the like at the time of contact with the counterpart material.
  • the number average molecular weight is a measured value in terms of polystyrene by GPC (gel permeation chromatograph) measurement.
  • thermosetting urethane composition contains an isocyanate component and a crosslinking agent other than PEA (polyol component). It does not specifically limit as said isocyanate component, For example, aliphatic isocyanate, alicyclic isocyanate, aromatic isocyanate etc. are mentioned. Of these, aromatic isocyanates are preferred from the viewpoint of good wear resistance.
  • aliphatic isocyanate examples include 1,6-hexamethylene diisocyanate (HDI), 2,2,4-trimethylhexamethylene diisocyanate, and lysine diisocyanate.
  • HDI 1,6-hexamethylene diisocyanate
  • 2,2,4-trimethylhexamethylene diisocyanate examples include 1,6-hexamethylene diisocyanate (HDI), 2,2,4-trimethylhexamethylene diisocyanate, and lysine diisocyanate.
  • isocyanurate body, biuret body, adduct body, etc. of hexamethylene diisocyanate and isophorone diisocyanate are also mentioned.
  • alicyclic isocyanate examples include alicyclic diisocyanates such as isophorone diisocyanate (IPDI), 4,4′-dicyclohexylmethane diisocyanate, 1,4-cyclohexane diisocyanate, norbornane diisocyanate (NBDI), and the like.
  • IPDI isophorone diisocyanate
  • NBDI norbornane diisocyanate
  • aromatic isocyanate examples include tolylene diisocyanate (TDI), phenylene diisocyanate, 4,4'-diphenylmethane diisocyanate, polymethylene polyphenylene polyisocyanate, and a mixture of diphenylmethane diisocyanate and polymethylene polyphenylene polyisocyanate (hereinafter collectively referred to as generic names).
  • TDI tolylene diisocyanate
  • phenylene diisocyanate 4,4'-diphenylmethane diisocyanate
  • polymethylene polyphenylene polyisocyanate examples of the aromatic isocyanate
  • NDI 1,5-naphthalene diisocyanate
  • XDI xylylene diisocyanate
  • carbodiimide-modified MDI urethane-modified MDI, and the like.
  • MDI and NDI are preferable as the isocyanate component. This is because, among aromatic isocyanates, particularly excellent wear resistance is exhibited.
  • crosslinking agent examples include 1,4-butanediol (1,4-BD), 1,4-bis ( ⁇ -hydroxyethoxy) benzene (BHEB), ethylene glycol, propylene glycol, hexanediol, diethylene glycol, triethylene glycol, and the like.
  • Methylolpropane (TMP) glycerin, 4,4′-methylenebis (2-chloroaniline), hydrazine, ethylenediamine, diethylenetriamine, 4,4′-diaminodiphenylmethane, 4,4′-diaminodicyclohexylmethane, N, N-bis ( 2-hydroxypropyl) aniline, water and the like.
  • 1,4-butanediol, TMP, and BHEB are preferable because appropriate rubber hardness and rubber rigidity are easily exhibited.
  • a thermosetting urethane composition containing 1,4-butanediol, TMP, or BHEB has a relatively long pot life and can be molded by hand casting.
  • the said crosslinking agent may be used independently and may be used together 2 or more types.
  • thermosetting urethane composition further includes chain extenders, reaction aids such as crosslinking accelerators and crosslinking retarders, hydrolysis inhibitors, reinforcing materials such as inorganic fibers and inorganic fillers, colorants, light stabilizers, Various additives such as a heat stabilizer, an antioxidant, an antifungal agent, a flame retardant, and a filler (a bulking agent) may be contained as necessary.
  • reaction aids such as crosslinking accelerators and crosslinking retarders, hydrolysis inhibitors, reinforcing materials such as inorganic fibers and inorganic fillers, colorants, light stabilizers,
  • Various additives such as a heat stabilizer, an antioxidant, an antifungal agent, a flame retardant, and a filler (a bulking agent) may be contained as necessary.
  • the isocyanate group concentration in the thermosetting urethane composition is preferably 5.50 to 10.0% by weight.
  • concentration means the weight ratio of the isocyanate group contained in the total amount of an isocyanate component, a polyol component, and a crosslinking agent.
  • the cured product of the thermosetting urethane composition has a JIS-A hardness (value measured by a spring type A hardness tester in accordance with JIS K 7312) of 67 ° or more.
  • JIS-A hardness of the cured product is less than 67 °, the cured product has few crosslinking points, and swelling due to exposure to coolant cannot be sufficiently avoided.
  • the upper limit of the JIS-A hardness of the cured product is not particularly limited, and may be appropriately selected in consideration of the use location of the elastomer member.
  • the JIS-A hardness of the cured product is preferably 67 to 90 ° when the elastomer member is used as an elastic member of a sealing member for a machine tool to be described later.
  • the JIS-A hardness of the cured product is less than 67 °, as described above, resistance to the coolant may not be exhibited.
  • the JIS-A hardness of the cured product exceeds 90 °, the stress (pressure contact force) of the seal portion becomes too large, and as a result, the sliding resistance may become too large.
  • the JIS-A hardness is more preferably 70 to 85 °.
  • the elastomer member is obtained by curing the thermosetting urethane composition under predetermined conditions.
  • the curing conditions for the thermosetting urethane composition are not particularly limited, and may be set as appropriate according to the composition of the thermosetting urethane composition.
  • As the curing conditions it is usually possible to employ conditions of heating at 100 to 160 ° C. for 30 to 90 minutes. Further, after the curing treatment is performed under the above conditions and the mold is removed from the mold, post-curing may be performed at 100 to 160 ° C. for 3 to 48 hours.
  • the isocyanate component and the polyol component contained in the thermosetting urethane composition may be pre-reacted to form a prepolymer before the thermosetting urethane composition is cured under predetermined conditions.
  • the molding method of the thermosetting urethane composition for obtaining the elastomer member is not particularly limited.
  • the molding method include normal pressure casting, reduced pressure casting, centrifugal molding, continuous rotational molding, extrusion molding, injection molding, reaction injection molding (RIM), spin coating, and the like. Among these, centrifugal molding and continuous rotational molding are preferable.
  • Such an elastomer member can be suitably used for a machine tool using a coolant.
  • Fig.1 (a) is a top view which shows an example of the sealing member for machine tools which concerns on embodiment of this invention
  • FIG.1 (b) is a side view of Fig.1 (a).
  • the machine tool seal member 10 includes a support member 11 and an elastic member 12.
  • the support member 11 is made of a processed metal plate bent along the longitudinal direction of a substantially rectangular metal plate.
  • the elastic member 12 is a plate-like member 12 fixed via an adhesive layer 13 along the longitudinal direction of the support member 11.
  • the elastic member 12 is made of the elastomer member.
  • the edge portion 12 a of the elastic member 12 is slidably in contact with the mating member, whereby a predetermined portion of the machine tool can be reliably sealed.
  • the support member 11 is usually made of a metal material such as steel or aluminum from the viewpoint of durability or strength.
  • the support member 11 may be made of ceramic, rigid plastic, or the like.
  • a non-surface treated steel plate a steel plate subjected to surface treatment such as zinc phosphate treatment, chromate treatment, rust prevention resin treatment, or an elastic metal plate such as phosphor bronze or spring steel is used. You can also.
  • the support member 11 may be surface-treated in advance with a urethane-based primer, a silane-based primer, or the like in order to improve compatibility with the adhesive layer 13. Further, the surface of the support member 11 (particularly the region in contact with the elastic member 12 via the adhesive layer 13) may be subjected to a roughening treatment. Thereby, the adhesiveness of the supporting member 11 and the adhesive bond layer 13 can be improved by an anchor effect.
  • the elastic member 12 is composed of the elastomer member formed into a plate shape.
  • the elastic member 12 is fixed to the support member 11 via the adhesive layer 13.
  • the elastomer member is as described above.
  • the JIS-A hardness of the elastic member 12 is preferably 67 to 90 °.
  • the rebound resilience of the elastic member 12 is preferably 10 to 50%.
  • the elastic member 12 is, for example, a member that slides on the contact surface on the machine tool side. In this case, the elastic member 12 is required to have a quick response for following the surface irregularities of the contact surface and a performance that does not generate an abnormal sound (buzzing sound) when sliding. These two performances are in a trade-off relationship. However, by setting the rebound resilience of the elastic member 12 in the above range, the above two performances can be achieved at the same time.
  • the rebound resilience is more preferably 20 to 40%.
  • the rebound resilience is a value measured according to JIS K 7312.
  • the adhesive layer 13 has a role of joining the support member 11 and the elastic member 12.
  • the adhesive layer 13 is not particularly limited as long as the elastic member 12 can be bonded to the support member 11 with sufficient adhesive force.
  • Examples of the adhesive layer 13 include EVA, polyamide, or polyurethane hot melt adhesives, those formed with a curable adhesive, and those formed with a double-sided tape.
  • the adhesive layer 13 is preferably formed of a urethane hot melt adhesive from the viewpoint of excellent bonding strength between the support member 11 and the elastic member 12.
  • the adhesive layer 13 is particularly preferably formed of a moisture curable urethane hot melt adhesive.
  • the adhesive layer 13 formed of the moisture-curing urethane hot melt adhesive does not melt or soften even when the machine tool seal member 10 becomes hot during use, and has stable adhesiveness. Can be maintained.
  • the moisture-curable urethane-based hot melt adhesive is applied and bonded in a molten state, and then reacts with moisture adhering to the surface of the elastic member and / or the support member, or moisture in the atmosphere, and gradually undergoes a crosslinking reaction.
  • An advancing adhesive that contains a urethane prepolymer includes a moisture-curing type comprising, for example, 30 to 50% by weight of a urethane prepolymer (for example, a polycarbonate-based urethane prepolymer), 0 to 70% by weight of a thermoplastic resin, and 0 to 50% by weight of a tackifier. Examples thereof include a urethane-based hot melt adhesive.
  • the urethane prepolymer has two or more isocyanate groups in the molecule and cures by reacting with moisture in the atmosphere.
  • the thermoplastic resin include saturated polyester.
  • the thermoplastic resin has the role of increasing the adhesive force by imparting crystallinity to the moisture-curable urethane hot melt adhesive and the plasticizer that can be applied at a temperature of about 120 to 140 ° C. Have a role.
  • the thermoplastic resin can impart excellent low temperature workability to the moisture curable urethane hot melt adhesive.
  • a commercial item can also be used as said moisture hardening type urethane type hot-melt-adhesive.
  • Examples of the commercially available products include Tyforce H-810, Tyforce H-850, Tyforce PUR-1S, Tyforce H-910, Tyforce FH-445, Tyforce FH-315SB, Tyforce FH-430, Examples include Tyforce FH-00SB (all manufactured by DIC), RHC-101, 5921 (manufactured by No-Tape Kogyo), Hibon 4836M, Hibon 4836S, Hibon 4836W (manufactured by Hitachi Chemical). Of these, tie force H-810 and tie force H-850 are preferred.
  • the thickness of the adhesive layer 13 is not particularly limited, but is preferably 50 to 500 ⁇ m.
  • the thickness is preferably 50 to 200 ⁇ m. If it is less than 50 ⁇ m, sufficient adhesive strength may not be ensured. On the other hand, if it exceeds 200 ⁇ m, the temperature and time may be excessively required for melting the hot melt adhesive.
  • the machine tool seal member 10 can be manufactured, for example, by the following method. (1) A steel plate or the like is used as a starting material, and after cutting into a predetermined size, bending processing or the like is performed as necessary to produce the support member 11. (2) Separately from the production of the support member 11 in (1) above, a sheet-like elastomer member made of a cured product of a thermosetting urethane composition is produced. Thereafter, the obtained elastomer member is cut into a predetermined size using an ultrasonic cutter or the like to produce the elastic member 12. The method for molding the elastomer member is as described above.
  • the shape of the elastic member 12 is a plate having a rectangular cross section, but in the machine tool seal member according to the embodiment of the present invention, The shape of the elastic member is not limited to such a shape.
  • the shape of the elastic member may be, for example, a shape in which the edge portion is subjected to C chamfering or R chamfering.
  • the elastic member may have a shape in which a cross-sectional shape (a shape of a surface perpendicular to the longitudinal direction) tapers continuously or intermittently toward the edge portion.
  • the machine tool seal member according to the embodiment of the present invention may be a machine tool seal member as shown in FIGS. Fig.2 (a) is a reverse view which shows another example of the sealing member for machine tools which concerns on embodiment of this invention, FIG.2 (b) is a side view of Fig.2 (a).
  • the machine tool seal member 20 includes a support member 21 made of a plate-like metal plate and an elastic member 22 integrally formed with the support member 21.
  • the elastic member 22 includes a main body portion 22A joined to the support member, and a lip portion 22B extending from the main body portion 22A and having an edge portion 22a that contacts the mating member.
  • the elastic member 22 is made of the elastomer member.
  • the sealing member 20 for machine tools can seal the predetermined part of a machine tool reliably, the edge part 22a of the elastic member 22 slidably contacts with an other party material.
  • the support member and the elastic member may be integrated without an adhesive layer.
  • the material of the support member 21 may be metal, ceramic, rigid plastic, or the like, similar to the support member 11 in the machine tool seal member 10 described above.
  • the elastic member 22 is the above-mentioned elastomer member, and its preferable physical properties are the same as those of the elastic member 12 in the machine tool seal member 10 described above.
  • a primer layer may be interposed between the support member 21 and the elastic member 22. Thereby, the adhesiveness of the support member 21 and the elastic member 22 can be improved more.
  • the machine tool seal member 20 is produced by placing the support member 21 at a predetermined position in the mold, and then casting an uncured thermosetting urethane composition and curing it under predetermined curing conditions. be able to.
  • the curing conditions of the thermosetting urethane composition are as described above.
  • the shape of the machine tool seal member according to the embodiment of the present invention is not limited to the shapes shown in FIGS. 1 (a), 1 (b), 2 (a), and 2 (b).
  • the said machine tool seal member should just have the same shape as the conventional machine tool seal members, such as a lip seal, a slide seal, a telescopic seal, and a cover seal.
  • a sealing member for a machine tool is used to protect a sliding portion or a sliding mechanism of a machine tool from cutting powder or coolant (cutting oil) in various machine tools such as a lathe or a machining center. It can be used as a seal member (wiper member). Specifically, for example, it can be used as a slide seal, a telescopic seal, a cover seal, a lip seal or the like.
  • FIG. 3 is a cross-sectional view schematically showing a part of the telescopic cover 100 to which the machine tool seal member 10 according to the embodiment of the present invention is attached.
  • the machine tool seal member 10 is fixed by bolting (not shown) the support member 11 to the lower surface of the outer front end portion of each cover member 15 constituting the telescopic cover 100.
  • the machine tool seal member 10 is attached to a position where the outer surface 15a of the cover member 15 located on the lower side and the end of the elastic member 12 are in sliding contact with each other.
  • the support member 11 is previously formed with a through hole for bolts (not shown).
  • the telescopic cover 100 in which the machine tool seal member 10 is attached to the outer front end portion of each cover member 15 prevents the chips and the like existing outside the telescopic cover 100 from entering the cover when the telescopic cover 100 is expanded or contracted. Can be prevented.
  • the use of the machine tool seal member according to the embodiment of the present invention is not limited to the telescopic seal.
  • the elastomer member according to the embodiment of the present invention can be used in addition to the elastic member of the machine tool seal member. Specifically, for example, it can be used for a transmission belt provided in a machine tool. In a machine tool, various members are configured to be driven using a transmission belt. Among the transmission belts used in the above machine tools, there is also a transmission belt arranged at a position exposed to the coolant. Such a transmission belt may be deteriorated (swelled or the additive is eluted) by being exposed to the coolant, or may be broken in some cases. On the other hand, if it is a transmission belt using the said elastomer member, degradation by the coolant mentioned above can be suppressed.
  • Example 1 100.00 parts by weight of MDI-PEA prepolymer (trade name “Samprene P-6814” manufactured by Sanyo Chemical Industries, Ltd.) heated to 110 ° C., 5.60 parts by weight of 1,4-BD (manufactured by Mitsubishi Chemical Corporation) And 0.76 parts by weight of TMP (Mitsubishi Gas Co., Ltd.) were added and mixed by stirring to prepare a urethane composition. Immediately after, the urethane composition obtained was put into a centrifugal molding machine, crosslinked under conditions of a mold temperature of 150 ° C. and a crosslinking time of 60 minutes, a cylindrical cured product having a thickness of 1.5 mm was molded, and then demolded did.
  • MDI-PEA prepolymer trade name “Samprene P-6814” manufactured by Sanyo Chemical Industries, Ltd.
  • 1,4-BD manufactured by Mitsubishi Chemical Corporation
  • TMP Mitsubishi Gas Co., Ltd.
  • one portion of the cylindrical cured product was cut and developed into a plate shape, followed by post-crosslinking in a blast oven at 110 ° C. for 24 hours to obtain a polyurethane raw sheet.
  • the original fabric sheet was cut into a length of 12 mm and a width of 49 mm to obtain a strip-shaped urethane sheet.
  • the urethane sheet had a JIS-A hardness of 70 °.
  • the JIS-A hardness of the urethane sheet was measured in accordance with JIS K 7312, with 10 urethane sheets having a thickness of 1.5 mm stacked.
  • Example 2 A strip-shaped urethane sheet was obtained in the same manner as in Example 1 except that the amount of 1,4-BD was changed to 6.36 parts by weight and the amount of TMP was changed to 0.20 parts by weight.
  • the urethane sheet had a JIS-A hardness of 80 °.
  • Example 3 MDI-PEA prepolymer heated to 110 ° C. (trade name “Samprene P-6814”, manufactured by Sanyo Chemical Industries, Ltd.) 100.00 parts by weight, 10.50 parts by weight of BHEB (Mitsubishi Chemical Fine), 1 , 4-BD (Mitsubishi Chemical Co., Ltd.) 1.59 parts by weight was added and mixed by stirring to prepare a urethane composition. Immediately after, the urethane composition obtained was put into a centrifugal molding machine, crosslinked under conditions of a mold temperature of 150 ° C. and a crosslinking time of 60 minutes, a cylindrical cured product having a thickness of 1.5 mm was molded, and then demolded did.
  • BHEB Mitsubishi Chemical Fine
  • 4-BD Mitsubishi Chemical Co., Ltd.
  • one portion of the cylindrical cured product was cut and developed into a plate shape, followed by post-crosslinking in a blast oven at 110 ° C. for 24 hours to obtain a polyurethane raw sheet.
  • the original fabric sheet was cut into a length of 12 mm and a width of 49 mm to obtain a strip-shaped urethane sheet.
  • the urethane sheet had a JIS-A hardness of 90 °.
  • Example 4 100.00 parts by weight of PEA (manufactured by Sumitomo Bayer Urethane Co., Ltd., trade name “Bulcolan 2000MM”) and 19.00 parts by weight of NDI (manufactured by Sumitomo Bayer Urethane Co., Ltd., trade name “Desmodur 15”) in a vacuum reactor at 125 ° C. The mixture was reacted for 15 minutes with stirring to obtain a prepolymer. Next, to the obtained prepolymer, 2.50 parts by weight of 1,4-BD (Mitsubishi Chemical Co., Ltd.) was added and stirred and mixed, and then charged into a centrifugal molding machine.
  • PEA manufactured by Sumitomo Bayer Urethane Co., Ltd., trade name “Bulcolan 2000MM”
  • NDI manufactured by Sumitomo Bayer Urethane Co., Ltd., trade name “Desmodur 15”
  • the mold temperature was 130 ° C.
  • the crosslinking time was 60
  • Crosslinking was performed under the condition of minutes
  • a cylindrical cured product having a thickness of 1.5 mm was molded, and then demolded.
  • one portion of the cylindrical cured product was cut and developed into a plate shape, followed by post-crosslinking in a blast oven at 110 ° C. for 24 hours to obtain a polyurethane raw sheet.
  • the original fabric sheet was cut into a length of 12 mm and a width of 49 mm to obtain a strip-shaped urethane sheet.
  • the urethane sheet had a JIS-A hardness of 80 °.
  • Example 5 A strip-like urethane sheet was obtained in the same manner as in Example 4 except that the amount of NDI was changed to 25.00 parts by weight and the amount of 1,4-BD was changed to 5.00 parts by weight.
  • the urethane sheet had a JIS-A hardness of 90 °.
  • Example 6 A strip-like urethane sheet was obtained in the same manner as in Example 4 except that the amount of NDI was changed to 40.00 parts by weight and the amount of 1,4-BD was changed to 11.00 parts by weight.
  • the urethane sheet had a JIS-A hardness of 96 °.
  • Example 7 A strip-like urethane sheet was obtained in the same manner as in Example 1 except that the amount of 1,4-BD was changed to 4.58 parts by weight and the amount of TMP was changed to 1.79 parts by weight.
  • the urethane sheet had a JIS-A hardness of 67 °.
  • Table 1 shows the composition and JIS-A hardness of the urethane sheets prepared in Examples 1 to 7.
  • the obtained mixture was molded by the following method, and then cut to obtain a strip-shaped rubber sheet having the same size as in Example 1.
  • the rubber sheet had a JIS-A hardness of 80 °.
  • the raw rubber after kneading was processed into a raw rubber sheet having a thickness of 1.6 mm by a calender rolling machine, and the raw rubber sheet was set in a press mold having an area of 1.5 mm thickness ⁇ 400 mm ⁇ 100 mm. Thereafter, a method of obtaining a rubber cross-linked sheet by press cross-linking at 130 ° C. for 30 minutes was adopted.
  • the rubber sheet had a JIS-A hardness of 80 °.
  • the molding method is that after the kneaded raw rubber is processed into a 1.6 mm thick raw rubber sheet by a calender rolling machine, and the raw rubber sheet is set in a press mold having a 1.5 mm thickness ⁇ 400 mm ⁇ 100 mm area. The method of press-crosslinking for 30 minutes at 130 ° C. to obtain a rubber crosslinked sheet was adopted.
  • EPDM Mitsubishi Chemicals, trade name “EPT4045M” 100.00 parts by weight, diethylene glycol (Mitsubishi Chemical Co., Ltd.) 3.00 parts by weight, ethylene glycol (Kyoeisha Chemicals Co., Ltd., “Light Ester EG”) 3.00 parts by weight Parts, paraffin oil (made by Idemitsu Kosan Co., Ltd., trade name “Paraffin Oil H”) 5.00 parts by weight, silica (made by Tosoh Corporation, trade name “Nip Seal VN3”) 50.00 parts by weight, zinc oxide (Nippon Chemical Industry Co., Ltd.) 5.00 parts by weight) and 5.00 parts by weight of titanium oxide (manufactured by Sakai Chemical Industry Co., Ltd.) were kneaded in a rubber kneader for about 180 seconds until the temperature reached 155 ° C.
  • the mixture was molded by the following method and then cut to obtain a strip-shaped rubber sheet having the same size as that of Example 1.
  • the rubber sheet had a JIS-A hardness of 70 °.
  • the molding method is that after the kneaded raw rubber is processed into a 1.6 mm thick raw rubber sheet by a calender rolling machine, and the raw rubber sheet is set in a press mold having a 1.5 mm thickness x 600 mm x 100 mm area The method of press-crosslinking at 160 ° C. for 30 minutes to obtain a rubber crosslinked sheet was adopted.
  • Example 4 An MDI-PCL thermoplastic polyurethane (trade name “E595PNAT” manufactured by Nippon Milactolan Co., Ltd.) was molded by the following method and then cut to obtain a rectangular urethane sheet having the same size as in Example 1.
  • the urethane sheet had a JIS-A hardness of 93 °. Molding was carried out by extruding a sheet having a thickness of 1.5 mm and a width of 200 mm using an extruder using a T die having an injection width of 200 mm. At this time, the temperature of the die was 190 ° C.
  • one portion of the cylindrical cured product was cut and developed into a plate shape, followed by post-crosslinking in a blast oven at 110 ° C. for 24 hours to obtain a polyurethane raw sheet.
  • the original fabric sheet was cut into a length of 12 mm and a width of 49 mm to obtain a strip-shaped urethane sheet.
  • the urethane sheet had a JIS-A hardness of 70 °.
  • one portion of the cylindrical cured product was cut and developed into a plate shape, followed by post-crosslinking in a blast oven at 110 ° C. for 24 hours to obtain a polyurethane raw sheet.
  • the original fabric sheet was cut into a length of 12 mm and a width of 49 mm to obtain a strip-shaped urethane sheet.
  • the urethane sheet had a JIS-A hardness of 77 °.
  • the obtained urethane composition was put into a centrifugal molding machine and crosslinked under the conditions of a mold temperature of 150 ° C. and a crosslinking time of 60 minutes to form a cylindrical cured product with a thickness of 1.5 mm, and then removed. Typed. Thereafter, one portion of the cylindrical cured product was cut and developed into a plate shape, followed by post-crosslinking in a blast oven at 110 ° C. for 24 hours to obtain a polyurethane raw sheet. Next, the original fabric sheet was cut into a length of 12 mm and a width of 49 mm to obtain a strip-shaped urethane sheet. The urethane sheet had a JIS-A hardness of 67 °.
  • Comparative Example 8 A strip-like urethane sheet was obtained in the same manner as in Comparative Example 7 except that the amount of carbodiimide-modified MDI was changed to 32.20 parts by weight and the amount of BHEB was changed to 13.00 parts by weight.
  • the urethane sheet had a JIS-A hardness of 85 °.
  • Example 9 A strip-shaped urethane sheet was obtained in the same manner as in Example 1 except that the amount of 1,4-BD was changed to 3.82 parts by weight and the amount of TMP was changed to 2.54 parts by weight.
  • the urethane sheet had a JIS-A hardness of 65 °.
  • Table 2 shows the blends and JIS-A hardness of the rubber sheets and urethane sheets prepared in Comparative Examples 1 to 9.
  • Coolant A oil-based: Trade name “Daphne Marg Plus MP10” (made by Idemitsu Kosan Co., Ltd.)
  • Coolant B water-based: 10-fold diluted product of trade name “Clear Cut RH-1K” (manufactured by Neos)
  • Coolant C water-based: 10-fold diluted product name of “Neocool Bio-60E” (manufactured by Moresco) Goods
  • FIG. 4 (a) and 4 (b) are graphs showing the immersion time and the weight increase rate when the sheet is immersed in the coolant A (50 ° C.).
  • FIG. 4A shows the evaluation results of Examples 1 to 7.
  • FIG. 4B shows the evaluation results of Comparative Examples 1 to 9.
  • FIG. 5A and FIG. 5B are graphs showing the immersion time and the weight increase rate when the sheet is immersed in the coolant B (50 ° C.).
  • FIG. 5 (a) shows the evaluation results of Examples 1-7.
  • FIG. 5B shows the evaluation results of Comparative Examples 1 to 9.
  • 6 (a) and 6 (b) are graphs showing the immersion time and the weight increase rate when the sheet is immersed in the coolant C (50 ° C.).
  • FIG. 6 (a) shows the evaluation results of Examples 1-7.
  • FIG. 6B shows the evaluation results of Comparative Examples 1 and 2.
  • Weight increase rate is -5 to + 5%. Swelling: the weight increase rate is greater than 5%. Elution: the weight loss rate is greater than 5% (weight increase rate ⁇ -5%).
  • the elastomer members (or rubber members) of Comparative Examples 1 to 9 were swollen or eluted by any coolant.
  • a sealing member for a machine tool using an elastomer member (rubber member) having the same composition as that of each of the urethane sheet of Example 2 and the rubber sheet of Comparative Example 1 was produced. Specifically, for the urethane sheet of Example 2, first, the crosslinked sheet was cut into 20 mm ⁇ 600 mm and adhered to a metal support having a thickness of 1.2 mm and a length of 900 mm. Then, the edge part was cut into required length and angle, the hole for attachment was opened, and it was set as the sealing member.
  • FIGS. 7A and 7B are a photograph (left side) and a schematic view (right side) of the state of the edge part when using a machine tool seal member provided with the urethane sheet of Example 2 as an elastic member.
  • the lower part is after operation.
  • FIGS. 8A and 8B are a photograph (left side) and a schematic view (right side) of the state of the edge portion when using a machine tool seal member provided with the rubber sheet of Comparative Example 1 as an elastic member.
  • the lower part is after operation.
  • the sealing member for a machine tool using an elastomer member having the same composition as that of the urethane sheet of Example 2 as an elastic member was only slightly worn as shown in FIG.
  • the seal member for a machine tool having a rubber member having the same composition as that of the rubber sheet of Comparative Example 1 was significantly worn (about 1 mm). From these things, it became clear that the elastomer member (elastic member) using PEA as a polyol component is excellent in durability.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Sealing Material Composition (AREA)

Abstract

La présente invention concerne : un élément élastomère qui convient à l'utilisation dans une machine-outil ; et un élément d'étanchéité pour machines-outils, qui utilise cet élément élastomère. Cet élément élastomère est caractérisé en ce que : il est formé d'un produit durci d'une composition de polyuréthane thermodurcissable ; présentant une dureté JIS-A de 67° ou plus ; et étant utilisé pour une machine-outil. Cet élément élastomère est également caractérisé en ce que : la composition de polyuréthane thermodurcissable contient un constituant polyol, un constituant isocyanate et un agent de réticulation ; et le constituant polyol est un polyéthylène adipate ester polyol (PEA).
PCT/JP2016/080840 2015-10-29 2016-10-18 Élément élastomère et élément d'étanchéité pour machines-outils WO2017073405A1 (fr)

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TWI763899B (zh) * 2017-08-08 2022-05-11 日商阪東化學股份有限公司 工作機械用密封部材

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JP2005225949A (ja) * 2004-02-12 2005-08-25 Dainippon Ink & Chem Inc 熱硬化性ポリウレタンエラストマー用組成物及び熱硬化性ポリウレタンエラストマー
WO2009123228A1 (fr) * 2008-04-01 2009-10-08 三井化学株式会社 Composition d'élastomère thermoplastique réticulé et procédé de production de ladite composition
US20100130632A1 (en) * 2006-12-29 2010-05-27 Speas Eric Scott Rick Closed Cell Foams Comprising Urethane Elastomers
WO2015119030A1 (fr) * 2014-02-06 2015-08-13 バンドー化学株式会社 Élément d'étanchéité pour machines-outils

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JP4775751B2 (ja) * 2001-07-31 2011-09-21 日本ポリウレタン工業株式会社 熱硬化ウレタンエラストマー成型物
JP5707522B1 (ja) * 2014-04-16 2015-04-30 バンドー化学株式会社 籾摺りロール
JP2017048319A (ja) * 2015-09-02 2017-03-09 東ソー株式会社 ポリウレタンエラストマー形成性組成物、およびそれを用いた産業機械部品

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JP2005225949A (ja) * 2004-02-12 2005-08-25 Dainippon Ink & Chem Inc 熱硬化性ポリウレタンエラストマー用組成物及び熱硬化性ポリウレタンエラストマー
US20100130632A1 (en) * 2006-12-29 2010-05-27 Speas Eric Scott Rick Closed Cell Foams Comprising Urethane Elastomers
WO2009123228A1 (fr) * 2008-04-01 2009-10-08 三井化学株式会社 Composition d'élastomère thermoplastique réticulé et procédé de production de ladite composition
WO2015119030A1 (fr) * 2014-02-06 2015-08-13 バンドー化学株式会社 Élément d'étanchéité pour machines-outils

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Publication number Priority date Publication date Assignee Title
TWI763899B (zh) * 2017-08-08 2022-05-11 日商阪東化學股份有限公司 工作機械用密封部材

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JPWO2017073405A1 (ja) 2017-10-26
CN108137770A (zh) 2018-06-08

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