EP4351870A1 - Article élastomère à base d'un mélange d'epdm, présentant des propriétés adhésives améliorées et une durée de vie accrue - Google Patents

Article élastomère à base d'un mélange d'epdm, présentant des propriétés adhésives améliorées et une durée de vie accrue

Info

Publication number
EP4351870A1
EP4351870A1 EP22733510.6A EP22733510A EP4351870A1 EP 4351870 A1 EP4351870 A1 EP 4351870A1 EP 22733510 A EP22733510 A EP 22733510A EP 4351870 A1 EP4351870 A1 EP 4351870A1
Authority
EP
European Patent Office
Prior art keywords
epdm
adhesive layer
base body
article according
fibers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22733510.6A
Other languages
German (de)
English (en)
Inventor
Michael Well
Reinhard Teves
Claus-Lüder Mahnken
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ContiTech Antriebssysteme GmbH
Original Assignee
ContiTech Antriebssysteme GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ContiTech Antriebssysteme GmbH filed Critical ContiTech Antriebssysteme GmbH
Publication of EP4351870A1 publication Critical patent/EP4351870A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D29/00—Producing belts or bands
    • B29D29/08—Toothed driving belts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G1/00—Driving-belts
    • F16G1/06—Driving-belts made of rubber
    • F16G1/08—Driving-belts made of rubber with reinforcement bonded by the rubber
    • F16G1/10—Driving-belts made of rubber with reinforcement bonded by the rubber with textile reinforcement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G1/00—Driving-belts
    • F16G1/28—Driving-belts with a contact surface of special shape, e.g. toothed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/16—EPM, i.e. ethylene-propylene copolymers; EPDM, i.e. ethylene-propylene-diene copolymers; EPT, i.e. ethylene-propylene terpolymers

Definitions

  • the invention relates to an elastomer article, which is preferably a drive belt, in particular a toothed belt, and a method for producing the elastomer article.
  • Transmission belts particularly toothed belts, comprise an elastomeric compound, a tension member and a fabric on the shaped side, e.g. in the form of teeth, of the elastomeric compound. Good adhesion of the elastomeric compound to the fabric is required for adequate performance.
  • a fabric treated with RFL can be used, to which an adhesive layer, e.g. made of polychloroprene rubber, is added.
  • WO 2010/069630 describes a toothed belt for a camshaft drive with a fiber-containing EPDM core mixture.
  • the object of the invention was therefore to provide elastomer articles, in particular drive belts, which exhibit improved textile adhesion to the elastomer body and a longer service life without the need for fibers to be mixed into the elastomer body.
  • a low-fiber or fiber-free rubber mixture in particular an EPDM mixture
  • the inventors have found that this can be achieved by employing a fibrous EPDM bond coat between an EPDM elastomeric body and the fabric.
  • an elastomer article preferably a drive belt, in particular a toothed belt, which has a base body 1 made of a vulcanized rubber mixture containing ethylene-propylene-diene rubber (EPDM), a textile planar body 8 and an adhesive layer 10 between the base body and the textile fabric, wherein the adhesive layer is formed from a vulcanized mixture containing EPDM and fibers.
  • EPDM ethylene-propylene-diene rubber
  • the elastomer article according to the invention exhibits excellent adhesion of the textile planar body to the base body, which is brought about by the adhesive layer used according to the invention.
  • EPDM compounds are used for the adhesive layer, which have a longer service life than polychloroprene compounds, which are usually used for the adhesive layer. In addition, this is advantageous for environmental reasons, since chlorine-containing materials can be dispensed with.
  • the adhesion optimization function is taken over by a very thin, fibrous EPDM mixture, for which a significantly smaller quantity of mixture is required than when using fibrous EPDM base bodies. This results in lower mixing costs, which is an economic advantage.
  • 1 shows a schematic cross section through an example of an elastomer article according to the invention
  • 2 shows a schematic three-dimensional partial representation of an example of an elastomer article according to the invention in the form of a toothed belt with a top view of the power transmission zone
  • Fig. 3 shows a schematic longitudinal section through an inventive
  • Elastomer article in the form of a toothed belt analogous to the example in Fig. 2.
  • phr is a quantity used in the rubber industry and means parts by weight per 100 parts by weight of the total amount of rubber present in the component concerned.
  • the elastomer article according to the invention comprises a base body made from a vulcanized rubber mixture that contains ethylene-propylene-diene rubber.
  • Ethylene-propylene-diene rubber is a copolymer of ethylene, propylene and at least one diene monomer, for which EPDM is used as an acronym.
  • the base body is in particular an elastomeric base body or an elastic base body.
  • the base body is formed by vulcanizing the rubber composition containing EPDM to obtain an EPDM elastomer.
  • the rubber mixture for the base body includes EPDM, which can be contained uncut or in a blend with at least one other rubber. It is particularly preferred that the EPDM is present in the rubber mixture without blending, i.e. no other rubber is present apart from EPDM. In this case, the body contains 100 phr of EPDM.
  • the rubber mixture for the base body comprises EPDM blended with at least one other rubber, in which case the body preferably contains more than 50 phr, more preferably more than 75 phr EPDM.
  • the at least one other rubber can be selected, for example, from ethylene-propylene rubber (EPM), (partially) hydrogenated nitrile rubber (HNBR), polychloroprene rubber (CR), fluorine rubber (FKM), silicone rubber, ethylene-vinyl acetate Copolymer (EVA) or a combination thereof, with EPDM being preferred when blended with EPM.
  • EPM ethylene-propylene rubber
  • HNBR hydrogenated nitrile rubber
  • CR polychloroprene rubber
  • FKM fluorine rubber
  • EVA ethylene-vinyl acetate Copolymer
  • the rubber mixture for the base body usually contains one or more additives in addition to EPDM and optionally other rubbers.
  • the rubber mixture generally comprises at least one crosslinker or a crosslinker system made up of crosslinking agent and accelerator.
  • the crosslinker or the crosslinker system can contain, for example, at least one peroxide and/or at least one metal oxide.
  • Further examples of additives are fillers, processing aids, plasticizers, antioxidants and combinations thereof.
  • Other additives that can be used as required are e.g. color pigments or flares. Reference is made to the general status of rubber compound technology.
  • the rubber mixture of the base body is vulcanized in combination with the textile planar body and the fluff layer in between in order to form the elastomer article.
  • the vulcanization is preferably a free-radical crosslinking or particularly preferably a peroxidic crosslinking.
  • the elastomer article according to the invention also comprises a textile planar body.
  • the textile planar body is attached to one side of the base body.
  • the textile planar body can be, for example, a woven fabric, a knitted fabric or a knitted fabric, with a woven fabric being preferred.
  • the textile planar body in particular the fabric, or the yarns or fibers from which the textile planar body is formed, can be made, for example Polyamide (PA), polyester, cotton, aramid, polyetheretherketone (PEEK), polyimide (PI) or a combination thereof.
  • the textile planar body, in particular the fabric is made of polyamide.
  • the textile planar body in particular the woven fabric, is provided with a polymer finish.
  • the polymeric finish can be formed by impregnation and/or surface coating of the textile planar body with a polymer or a polymer mixture, impregnation being preferred. If a polymeric finish includes a surface coating, the side of the textile fabric that faces away from the base body is generally coated.
  • the polymeric equipment can be formed from fluorine containing polymer, silicone, polyurethane (PU), resorcinol formaldehyde latex (RFL) or a combination thereof.
  • fluorine-containing polymer examples include polyvinyl fluoride (PVF), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE) or mixtures thereof, preferably PTFE.
  • the textile planar body, in particular the woven fabric is preferably finished with RFL.
  • the RFL finish is preferably carried out by dipping the textile fabric into an impregnation liquid based on resorcinol, formaldehyde and rubber latex, a so-called RFL dip.
  • the elastomer article according to the invention also comprises an adhesive layer which is arranged between the base body and the textile planar body.
  • the adhesive layer serves to improve the attachment of the textile planar body to the base body.
  • the adhesive layer is formed from a vulcanized compound, the compound containing EPDM and fibers.
  • the compound for the adhesive layer comprises EPDM, which can be included unblended or blended with at least one other rubber. It is particularly preferred that the EPDM is contained in the mixture without blending, ie apart from EPDM no other rubber is contained. In this case 100 phr of EPDM is included in the bond coat.
  • the blend for the subbing layer comprises EPDM blended with at least one other rubber, in which case the subbing layer preferably contains more than 50 phr, more preferably more than 75 phr EPDM.
  • the mixture for the adhesive layer usually contains one or more additives, for example in particular at least one crosslinker or a crosslinker system made up of crosslinking agent and accelerator.
  • the mixture for the adhesive layer is also vulcanized to form the adhesive layer during the vulcanization of the composite of base body and textile planar body.
  • the vulcanization is preferably a free-radical crosslinking or particularly preferably a peroxidic crosslinking.
  • Fibers are also contained in the mixture for the adhesive layer or in the adhesive layer.
  • the fibers are preferably distributed homogeneously in the mixture or in the adhesive layer.
  • the fibers can be pure or mixed as a hybrid.
  • the fibers are preferably short fibers with an average fiber length of not more than 10 mm.
  • the fibers may be fibrillated, i.e. a pulp, preferably fibrillated short fibers having an average fiber length of not more than 10 mm. Fibrillated fibers have a very high fiber surface due to the fibrils they contain and thus offer a good connection to the EPDM matrix.
  • the fibers can optionally also be provided with a coating of RFL or another suitable adhesion promoter.
  • the fibers of the adhesive layer can be made, for example, from polyamide (PA), polyimide (PI), aramid, polyvinyl alcohol (PVA), polyetheretherketone (PEEK), polyester, polysulfone (PSU), polyoxadiazole (POD), poly(p-phenylene-2,6 -benzobisoxazole) (PBO), polyphenylene or polyphenylene derivative, in particular polyphenylene sulphide (PPS), cotton, cellulose, carbon or glass, or a combination thereof, preferably PVA or aramid, in particular para-aramid or meta-aramid.
  • the fibers are, for example, an aramid pulp.
  • the fibers e.g. fibrillated fibers (pulp) in the mixture for the fluff layer have, for example, an average fiber length in the range of 0.1 to 10 mm, preferably 0.5 to 5 mm, more preferably 0.7 to 3 mm, up. It goes without saying that the length specifications apply to all of the fiber materials mentioned above.
  • the proportion of fibers in the adhesive layer is, for example, in the range 1 to 20 phr, preferably 1.5 to 15 phr, more preferably 2 to 8 phr.
  • the adhesive layer can be built into the elastomer article, in particular in the form of a thin coating on the textile planar body.
  • the adhesive layer has a thickness in the range from 0.05 to 1.0 mm, preferably from 0.3 to 0.5 mm.
  • a particular advantage of the invention is improved adhesion and a longer service life, without the use of fibers being necessary in the base body.
  • the base body can optionally contain fibers, e.g.
  • the proportion of fibers in the adhesive layer is in particular greater than the proportion of fibers in the base body, preferably at least twice as large.
  • the proportion of fibers in the adhesive layer or the base body relates in each case to the proportion by weight of fibers in percent, based on the total weight of the adhesive layer or the base body.
  • the base body is free of fibers.
  • the elastomer article according to the invention also includes a reinforcement that is embedded in the base body.
  • the reinforcement can be formed from one or more tension cords. Several tension cords, which are arranged next to each other, can form a reinforcement layer.
  • the reinforcement in the base body can be formed by one reinforcement layer or multiple reinforcement layers.
  • the tension cord, especially in the form of cords, can be made of polyamide (PA), aramid, polyester, glass (e.g. E or K glass), carbon, polyetheretherketone (PEEK) or polyethylene 2,6-naphthalate (PEN), for example be.
  • PA polyamide
  • aramid aramid
  • polyester e.g. E or K glass
  • carbon e.g. E or K glass
  • PEEK polyetheretherketone
  • PEN polyethylene 2,6-naphthalate
  • the embedded tension cords or the embedded tension cord layer usually run in the longitudinal direction of the belt, with the tension cords preferably being of cord construction.
  • the elastomeric article of the invention can be any elastomeric article based on EPDM in the non-woven fabric, e.g., a belt.
  • the elastomeric article is a drive belt, preferably a toothed belt.
  • the base body has a cover layer as the belt back and a substructure with a power transmission zone, preferably a tooth-shaped power transmission zone, with a reinforcement being embedded in the belt back.
  • the textile planar body is arranged on the side of the substructure with the power transmission zone and the fluff layer is arranged between the base body and the textile planar body. The textile planar body is thus connected via the fluff layer on the outside of the substructure of the base body to the force transmission zone, which usually has a profile, in particular a tooth-shaped profile.
  • the elastomer article in the form of a drive belt in particular a toothed belt, can be provided with a textile covering on the top layer, which, for example, performs a protective function.
  • a textile covering on the top layer which, for example, performs a protective function.
  • the textile planar bodies with the optional finishes as described above are suitable as a textile overlay, so that reference is made thereto.
  • the invention also relates to a method for producing an elastomer article, the method comprising the following steps: a) coating a textile fabric with a mixture containing EPDM and fibers, b) building up a composite by laying an unvulcanized base body made of a rubber mixture containing EPDM on top of one another and the coated fabric, wherein the coating of the fabric faces the base to form a fluff layer, and c) vulcanizing the composite.
  • the method according to the invention is particularly suitable for producing an elastomer article according to the invention, preferably a drive belt, in particular a toothed belt, as described above. Accordingly, reference is made to the above information on the individual components.
  • the textile planar body in particular a fabric, for example made of polyamide, is preferably provided with a polymeric finish, preferably it is finished with an RFL.
  • the coating of the fabric with a mixture containing EPDM and fibers is usually done on one side of the fabric.
  • the textile fabric is coated with the mixture containing EPDM and fibers (e.g. a pulp such as aramid pulp, or other short fibers), preferably thinly coated to provide a thin adhesive layer.
  • EPDM and fibers e.g. a pulp such as aramid pulp, or other short fibers
  • Suitable layer thicknesses are given above.
  • This fibrous EPDM mixture can be applied to a fabric coating plant as a solution or applied to the textile planar body or fabric as a calendered plate, in particular in a skim process.
  • the skim process involves applying a thin sheet of rubber to a fabric. This can be done with a roll calender, for example. The depth of penetration of the rubber sheet into the fabric can be adjusted via the process parameters.
  • Another option is to apply a thin calender plate using a pressure belt, as used in Rotocure systems.
  • the textile planar body coated in this way is then made up with the preferably fibre-free EPDM rubber mixture for the base body, with the coating of the textile planar body being placed between the textile planar body and the base body.
  • the composite is vulcanized according to the usual methods of rubber technology with which the person skilled in the art is familiar, generally at elevated temperature and, if appropriate, elevated pressure.
  • the mixture for the adhesive layer and the EPDM rubber mixture for the base body are preferably crosslinked peroxide.
  • the elastomer article comprises a base body 1 made from an EPDM elastomer, in particular a fiber-free EPDM elastomer. Furthermore, on one side of the base body 1 is a textile planar body 8, for example a fabric such as a polyamide fabric, attached. Located between the base body 1 and the textile planar body 8 is the fluff layer 10, which is formed from a fibrous EPDM matrix. The flat layer improves the adhesion of the textile planar body 8 to the base body 1.
  • the toothed belt has a top layer 2 as the back of the belt, an embedded reinforcement 3 and a substructure 4 .
  • the reinforcement consists of several tension cords arranged next to one another to form a reinforcement layer, in this case as part of a single-layer design.
  • the tension member particularly in the form of cords, can consist of, for example, polyamide (PA), aramid, polyester, glass (e.g. E or K glass), carbon, polyetheretherketone (PEEK) or polyethylene-2,6-naphthalate (PEN).
  • the cover layer 2 and the substructure 4 as a whole form the elastic or elastomeric base body 1, which consists of an EPDM vulcanizate, e.g. based on unblended EPDM or an EPM/EPD blend.
  • the substructure 4 is provided with a tooth-shaped profile, comprising teeth 5 and toothed bars 6, and forms the power transmission zone 7, which is particularly susceptible to wear due to abrasion and the influence of oils.
  • the power transmission zone is equipped with a textile surface body 8, which can be a woven, knitted or knitted fabric, with woven fabric being preferred, particularly in the case of a toothed belt.
  • the textile planar body in particular the woven fabric, can be formed from polyamide (PA), polyester, cotton, aramid, polyetheretherketone (PEEK) or combinations thereof, for example.
  • the textile planar body is preferably provided with a polymeric finish, eg impregnated with it and/or surface-coated (outer layer 9). It is preferably a finish with RFL, for example a polyamide fabric finished with RFL.
  • the fluff layer 10 Located between the textile planar body 8 and the substructure 4 of the base body is the fluff layer 10 made of a fiber-containing EPDM vulcanizate, which is not shown here for reasons of clarity (cf. FIG. 3).
  • the cover layer 2 is free of a protective textile covering. Otherwise the exemplary embodiment corresponds to the exemplary embodiment according to FIG.
  • Fig. 3 shows a schematic longitudinal section through an elastomer article according to the invention in the form of a toothed belt analogous to the example of Fig. 2.
  • the toothed belt according to Fig. 3 comprises a cover layer 2 as the back of the belt, an embedded reinforcement 3 in the form of tension cords and a substructure 4 with a tooth-shaped force transmission zone 7.
  • the textile planar body 8 is applied to the substructure 4.
  • the adhesive layer 10 made of fibrous EPDM vulcanizate is arranged between the textile planar body 8 and the substructure 4 .
  • the top layer 2 is also equipped with a textile layer 11 .
  • the fibers used in the following examples are aramid pulp.
  • the proportion in the fibrous EPDM coating (adhesive layer) is 3 phr in each case.
  • the average fiber length is 1-1.5 mm.
  • the layer thickness of the adhesive layer is 0.4 mm.
  • All EPDM compounds used are pure EPDM compounds without other types of rubber (uncut) and have been peroxide crosslinked.
  • the structure of the toothed belts produced in Examples 2 and 3 corresponds to the structure according to FIGS. 2 and 3.
  • Polyamide fabrics with different coatings are placed on an unvulcanized rubber sheet made of a fiber-free mixture based on a peroxide-crosslinking EPDM rubber mixture, with the fabric coating being placed between the fabric and the rubber sheet and serving as an adhesive layer.
  • the structure is vulcanized under pressure at 180° C. for 20 minutes.
  • the EPDM adhesive layer is fibre-free and contains fibres. All other components for the fibrous-free EPDM coating and the fibrous EPDM coating are identical.
  • the release force was determined using the DIN 53530 measurement method. Depending on the coating used for the polyamide fabric, the following separation forces result: Conclusion: The coating with a fibrous EPDM mixture shows a significant improvement in adhesion values.
  • Toothed belts made of EPDM which were manufactured with polychloroprene, non-fibrous and fibrous EPDM-coated fabric (polyamide fabric as in Example 1) are tested on a five-pulley test bench at room temperature and 7 kW of force.
  • the vulcanization conditions for the product are 30 minutes at 180°C.
  • Polychloroprene coating 210 h EPDM fiber-free coating: 260 h EPDM fiber-containing coating: 330 h
  • Toothed belts made of EPDM which were produced with polychloroprene, non-fibrous and fibrous EPDM-coated fabric (polyamide fabric as in Example 1), are tested on a five-pulley test stand at 120° C. and 5 kW of force.
  • the vulcanization conditions for the product are 30 minutes at 180°C.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un article élastomère comprenant une partie principale (1) qui est constituée d'un mélange de caoutchouc contenant du caoutchouc de monomère d'éthylène-propylène-diène vulcanisé (EPDM), un corps textile plat (8) et une couche adhésive (10) entre la partie principale et le corps textile plat, la couche adhésive étant formée par un mélange vulcanisé qui contient de l'EPDM et des fibres. L'article élastomère est caractérisé par des propriétés adhésives améliorées et une durée de vie accrue. L'article élastomère est particulièrement approprié en tant que courroie d'entraînement, plus particulièrement en tant que courroie dentée.
EP22733510.6A 2021-06-08 2022-05-11 Article élastomère à base d'un mélange d'epdm, présentant des propriétés adhésives améliorées et une durée de vie accrue Pending EP4351870A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021205779.9A DE102021205779A1 (de) 2021-06-08 2021-06-08 Elastomerartikel auf Basis einer EPDM Mischung mit verbesserter Hafteigenschaft und verbesserter Lebensdauer
PCT/DE2022/200099 WO2022258115A1 (fr) 2021-06-08 2022-05-11 Article élastomère à base d'un mélange d'epdm, présentant des propriétés adhésives améliorées et une durée de vie accrue

Publications (1)

Publication Number Publication Date
EP4351870A1 true EP4351870A1 (fr) 2024-04-17

Family

ID=82214106

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22733510.6A Pending EP4351870A1 (fr) 2021-06-08 2022-05-11 Article élastomère à base d'un mélange d'epdm, présentant des propriétés adhésives améliorées et une durée de vie accrue

Country Status (3)

Country Link
EP (1) EP4351870A1 (fr)
DE (1) DE102021205779A1 (fr)
WO (1) WO2022258115A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8197372B2 (en) * 2006-04-07 2012-06-12 The Gates Corporation Power transmission belt
DE102008055530A1 (de) 2008-12-16 2010-06-17 Contitech Antriebssysteme Gmbh Zahnriemen zum Antrieb einer Nockenwelle in Hochleistungsmotoren
JP5885240B2 (ja) * 2011-11-21 2016-03-15 ゲイツ・ユニッタ・アジア株式会社 伝動ベルト

Also Published As

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WO2022258115A1 (fr) 2022-12-15
DE102021205779A1 (de) 2022-12-08

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