EP2376804A1

EP2376804A1 - Elastic articles, particularly drive belts, having a textile overlay and a bonding agent made from meltable plastic

Info

Publication number: EP2376804A1
Application number: EP09752143A
Authority: EP
Inventors: Henning Kanzow; Marko Schleicher; Siegmar Gebhardt; Claus-Lüder Mahnken
Original assignee: ContiTech Antriebssysteme GmbH
Current assignee: ContiTech Antriebssysteme GmbH
Priority date: 2008-12-10
Filing date: 2009-10-29
Publication date: 2011-10-19
Also published as: DE102008055497A1; US8507391B2; CN102245929B; DE102008055497B4; WO2010066505A1; US20110269589A1; CN102245929A

Abstract

The invention relates to an article having an elastic main element based on a vulcanizate having a wear-susceptible article surface. The article is particularly a drive belt (8) having a top layer (9) as the belt rear and a substructure (10) having a force transmission zone (13), wherein the force transmission zone and/or the top layer is/are supplied with a textile overlay (15), wherein the textile overlay is in turn additionally prepared with a plastic. The plastic is a bonding agent that is arranged between the main body and the textile overlay (15), wherein the plastic is supplied such that it melts during vulcanization and penetrates into the textile overlay while bonding, connected to a permanent adhesive bond between main body and textile overlay. A cotton fabric is used as the textile overlay (15), for example. The plastic is in the form of a film, for example, particularly in the form of a PE film. The primary purpose of use is the v-belt, ribbed v-belt (8) and the toothed belt.

Description

description

Elastic article, in particular drive belt, with a textile cover and a bonding agent of fusible plastic

The invention relates to an article having an elastic body based on a Vulkanisates with a wear-prone article surface, which is provided with a textile support, in turn, the textile support is at least partially additionally equipped with a plastic. The elastic base body is usually still provided with an embedded reinforcement or tension member, which can be designed in one or more layers.

An article that is subject to dynamic loading and thus wear as well as noise, for example, a belt, belt, belt, hose, air bag, compensator or a multi-layer fabric, the belt in the form of a drive belt is of particular importance. The elastic base body of the drive belt comprises a cover layer as a belt back and a substructure with a power transmission zone. In this regard, reference is made in particular to the following patent literature: DE 38 23 157 A1, DE 10 2006 007 509 A1, EP 1 818 567 A1, WO 96/02584 A1, WO 2005/080821 A1, WO 2006/066669 A1, US Pat. No. 3,981,206 and US Pat US 5,417,618.

Drive belts as the main field of application are provided with a coating for noise reduction as well as for increasing abrasion resistance, in particular in the area of the power transmission zone. The related art is: A flock coating, in particular in the form of a cotton or aramid flock, or a thin elastic polymer layer filled with fibers (eg aramid fibers), for example according to the published patent application DE 38 23 157 A1, is used, the adhesion of the flock coating usually taking place by means of a solution. For some engines, however, this coating does not work permanently. In addition, occur in some engines noise problems in moisture.

A knitted textile cover is used, for example according to the patent US Pat. No. 3,981,206. The disadvantage here is that noise is generated on test engines when damp.

- Used is a textile cover in the form of a knitted fabric. In this regard, reference is made in particular to the published patent application DE 10 2006 007 509 A1. The Kettwirkware consists of a first yarn, in particular of a polyamide (PA) or polyester (PES), and a second yarn, in particular from a

Polyurethane (PU). Another disadvantage here is that noise is also produced on test engines when exposed to moisture.

- The textile cover is a PA6.6-Strechgewebe and is used in particular in timing belts, in which case, in particular, the published patent EP 1 818 567 Al is mentioned. However, a PA6.6 stretch fabric is relatively expensive.

- In the publication WO2005 / 080821 Al a toothed belt is described, the cover layer and power transmission zone is provided with a textile support, in turn, the textile support is prepared with an oil-resistant plastic.

The plastic used is a fluoroplastic (for example PTFE).

- For some PU belts, a fabric is used as a textile support, in particular of PA6.6, in which a film, for example a polyethylene film, is applied to the outside of the fabric support. However, the film is a process aid. When forming the teeth with the casting PU prevents the liquid PU flowing through the tissue. The fabric does not crosslink with the PU and has no other function. For the state of the art of PU belts reference is made, for example, to the published patent application WO 96/02584 A1.

- According to a recent development according to DE 10 2008 012 044.8, instead of the textile coverings or in combination with these, a film (eg PTFE film) or a film composite (eg PA-PTFE film composite) is used, in particular from the point of view of the oil-resistant equipment of a drive belt ,

Development focus, however, form the textile covers, which are the generic article, in particular drive belt, also based.

In the background of the above-mentioned problems when using a textile cover, the object of the invention is to provide an article of the type mentioned, which is provided with a prepared with a plastic textile cover, in which a

Combination of durable wear contactor and noise insulation, especially in wet noise, while ensuring improved adhesion of the textile support to the body is guaranteed.

This object is achieved in that the plastic is a bonding agent, which is arranged between the base body and the textile support, wherein the plastic is such that it melts during vulcanization and penetrates under co-crosslinking in the textile support, connected with a durable bond of body and textile pad.

The textile cover can be a woven, knitted or knitted fabric or fleece, in which case a woven, knitted or knitted fabric is used in particular. These three last-mentioned textile overlay variants are elastic and can be used for all article types according to claim 2. In some applications, especially in V-belts, nonwovens can be used as less elastic textile supports. The textile cover comprises fibers, yarns or monofilaments. Advantageously, the textile overlay partially or wholly of cotton and / or polyester and / or polyamide. If cotton is used, the best results are achieved with untreated cotton.

The adhesion promoter forms, in particular, an adhesive layer, with the following two variants in particular:

- The adhesive layer is a film which is formed in particular of a pressed plastic. The film can be ironed onto the film before vulcanization. Alternatively, there is also the possibility that the film is inserted between the textile support and the article blank prior to vulcanization.

- The adhesive layer is a film, which is formed in particular of a plastic solution. In this case, the textile cover is coated with a plastic solution prior to assembly of the article blank.

The adhesive layer has a thickness of 0.01 mm to 2 mm, in particular from 0.01 to 1 mm, in particular from 0.02 to 0.1 mm.

The adhesion promoter is preferably a polyolefin, in particular a polyethylene (PE) or polypropylene (PP). Of particular importance is PE.

Since the adhesive plastic can penetrate to the surface of the textile support, it is possible to incorporate additional particles in the plastic, especially in terms of resistance to chemicals, oils and heat. These particles may consist of silicone and / or polyurethane and / or of a fluorine-containing plastic. To name as fluorine-containing plastics in particular polyvinyl fluoride (PVF), polyvinylidene fluoride (PVDF) and polytetrafluoroethylene (PTFE). Of particular importance is PTFE. The main body is usually a vulcanizate based on a vulcanized rubber mixture containing at least one rubber component and mixing ingredients. The rubber component is in particular an ethylene-propylene copolymer (EPM), an ethylene-propylene-diene copolymer (EPDM), (partially) hydrogenated nitrile rubber (HNBR), chloroprene rubber (CR),

Fluororubber (FKM), natural rubber (NR), styrene-butadiene rubber (SBR) or butadiene rubber (BR) used, which are uncut or blended with at least one further rubber component, in particular with one of the aforementioned types of rubber, for example in the form of a EPM / EPDM or SBR / BR blend. Of particular importance is EPM or EPDM or an EPM / EPDM blend. The abovementioned types of rubber are used in particular in drive belts. The compounding ingredients comprise at least one crosslinker or crosslinker system (crosslinker and accelerator). Other mixing ingredients are usually still a filler and / or a processing aid and / or a plasticizer and / or an aging inhibitor and optionally further additives, such as fibers and color pigments. In this regard, reference is made to the general state of rubber mixing technology.

The vulcanizate is especially crosslinked peroxide, which in conjunction with the

Rubber composition of the above type will be explained in more detail. The usual vulcanization temperatures are 130 to 200 ° C. The plastic as a primer, for example PE, partially mixed with the rubber mixture in contact and is crosslinked by the peroxides, creating a strong bond between the rubber mixture, the adhesion promoter and the textile support.

The new adhesive concept is used in particular in the production of a belt, belt, belt, hose, air bellows (axial bellows, cross-layer bellows), compensator or a multilayer material web. Of prime importance is the use of the new adhesive concept in the manufacture of a drive belt, constructive as a flat belt, V-belt, V-ribbed belt, toothed belt, Coupling belt or elevator belt may be formed. A special focus of use is once again the V-belt, V-ribbed belt and the toothed belt, which are presented in greater detail in the context of the exemplary embodiments.

In drive belt can / can be provided with a textile support, the power transmission zone and / or the cover layer, which in turn is additionally prepared with a plastic according to the characterizing part of claim 5 or 6.

The invention will now be explained with reference to three exemplary embodiments with reference to schematic drawings. Show it:

Fig. 1 a V-belt (cross section);

2 shows a V-ribbed belt (cross section);

3 shows a toothed belt (longitudinal section).

Fig. 1 shows a drive belt 1, which is designed as a V-belt. The basic body on the basis of a Vulkanisates comprises a cover layer 2 as a belt back, an embedded reinforcement layer with longitudinally extending tension members 6 in the form of Einzelcorden and a substructure 3. The two wedge-shaped side edges, which form the power transmission zone 4 and 5, extend here from the Cover layer 2 into the substructure 3.

The textile cover 7 is a woven, knitted, knitted or nonwoven fabric, in particular based on untreated cotton, and detects the power transmission zone 4 and 5 with complete encasing of the cover layer 2 and the base 3 of the V-belt. Between the main body of the V-belt and the textile support 7, a plastic bonding agent is present, wherein the plastic is such that it melts during vulcanization and penetrates under co-crosslinking in the textile support, connected to a durable bond of body and textile support. Adhesive, which comprises the entire textile support 7, in particular a film of a polyolefin, in particular a PE film or PP film is used, which then leads to a modified textile coating in the context of vulcanization. Of particular importance is a PE-modified textile cover.

Fig. 2 shows a drive belt 8, which is designed as a V-ribbed belt, with a cover layer 9 as a belt back, a reinforcement layer extending in the longitudinal direction parallel tension members 14 in the form of Einzelcorden and with a substructure 10. The substructure has a V-rib structure, formed from Ribs 11 and grooves 12. The substructure includes the power transmission zone 13th

The textile cover 15, which detects only the power transmission zone 13, consists of a woven, knitted or knitted fabric, in particular on the basis of untreated cotton. As a primer, a PE film is also preferably used here, to form a PE-modified textile support.

In connection with a V-ribbed belt (short name KRR), three different belts were tested for their abrasion behavior, the material parameters and the abrasion being recorded in the following table:

The cotton was untreated.

The abrasion was determined on a fired diesel engine with high non-uniformity and a speed of 800 min-1 on the weight change after running time. As can be seen from the table, the two KRR (b, c) are characterized by the modified PE textile cover in contrast to the KRR (a) without modified textile overlay characterized by a significantly improved abrasion behavior.

Furthermore, it was found in operation on a diesel engine fired that when cotton is added, the cotton knit at KRR (a) swells and is destroyed after two minutes, while at the two KRR (b, c) even after ten minutes under the same conditions no signs of wear occur. In addition, an improvement in the adhesion of the cotton knit was found by the inserted PE Fo lie.

Fig. 3 finally shows a drive belt 16 which is designed as a toothed belt, with a cover layer 17 as a belt back, a reinforcement layer extending in the longitudinal direction parallel tension members 22 in the form of Einzelcorden and with a substructure 18. The substructure is made of teeth 19 and toothed webs 20 formed and includes the power transmission zone 21st

The textile support 23, which exclusively covers the force transmission zone 21, consists of a woven, knitted or knitted fabric, in particular again based on untreated cotton. As a primer, a PE film is also preferably used here, again to form a PE-modified textile support.

The tension members 6 (FIG. 1), 14 (FIG. 2) and 22 (FIG. 3) consist for example of steel, polyamide, aramid, polyester, glass fibers, carbon fibers, polyetheretherketone (PEEK) or polyethylene-2,6-naphthalate ( PEN).

The cover layers 9 (FIG. 2) and 17 (FIG. 3) can be provided free of a textile support or also with a textile support. This textile support can then be PE-modified, for example. LIST OF REFERENCE NUMBERS

(Part of the description)

I drive belt (V-belt) 2 top layer (belt back)

3 substructure

4 power transmission zone

5 power transmission zone

6 tension members in the form of individual cords 7 textile support

8 drive belts (V-ribbed belts)

9 top layer (belt back)

10 substructure

I I ribs 12 grooves

13 power transmission zone

14 tension members in the form of single cords

15 textile overlay

16 drive belt (timing belt) 17 top layer (belt back)

18 substructure

19 teeth

20 tooth bridges

21 Power transmission zone 22 Zugträger in the form of Einzelcorden 23 textile overlay

Claims

claims

1. An article with an elastic base on the basis of a Vulkanisates with a wear-prone article surface, which is provided with a textile support (7, 15, 23), in turn, the textile support is at least partially additionally prepared with a plastic, characterized in that the Plastic is a bonding agent, which is arranged between the base body and the textile support (7, 15, 23), wherein the plastic is such that it melts during vulcanization and penetrates under co-crosslinking in the textile support, connected to a durable bond of Body and textile pad.

2. Article according to claim 1, characterized in that this is a band, belt, belt, hose, air bag, a compensator or a multilayer fabric web.

3. Article according to claim 1 or 2, characterized in that the textile support (7, 15, 23) is a woven, knitted fabric or knit fabric.

4. Article according to one of claims 1 to 3, characterized in that the entire textile support (7, 15, 23) is prepared with the adhesion promoter made of plastic.

5. An article having an elastic base based on a vulcanizate with a wear-prone article surface, the article being a drive belt

(1, 8, 16), comprising a cover layer (2, 9, 17) as a belt back and a substructure (3, 10, 18) with a power transmission zone (4, 5, 13, 21), wherein at least the power transmission zone with a Textile support (7, 15, 23) is provided, in turn, at least the textile support, which acts in the power transmission zone, is additionally prepared with a plastic, characterized in that the plastic is a bonding agent between the base body and the textile support (7, 15, 23) is arranged, wherein the plastic is such that it melts during vulcanization and thereby co-crosslinking in the Textile support penetrates, combined with a durable bond between the body and the textile support.

6. An article having an elastic body based on a Vulkanisates with a wear-prone article surface, wherein the article is a drive belt

(1, 8, 16), comprising a cover layer (2, 9, 17) as a belt back and a substructure (3, 10, 18) with a power transmission zone (4, 5, 13, 21), wherein at least the cover layer with a Textile support (7, 15, 23) is provided, in turn, at least the textile support, which acts on the cover layer, is additionally prepared with a plastic, characterized in that the plastic a

Adhesive is, which is arranged between the base body and the textile support (7, 15, 23), wherein the plastic is such that it melts during vulcanization and penetrates under co-crosslinking in the textile support, connected to a durable bond of body and textile wraps.

7. Article according to claim 5 or 6, characterized in that this is a V-belt (1).

8. Article according to claim 7, characterized in that the textile support (7) of the V-belt (1) is a woven, knitted fabric or knit fabric.

9. Article according to claim 7 or 8, characterized in that the textile support (7) covers the cover layer (2) and the substructure (3) with complete sheathing of the belt (1).

10. Article according to claim 9, characterized in that the entire textile support (7) is prepared with the adhesion promoter made of plastic.

11. Article according to claim 5 or 6, characterized in that this is a V-ribbed belt (8).

12. Article according to claim 5 or 6, characterized in that this is a toothed belt (16).

13. Article according to claim 11 or 12, characterized in that the textile support (15, 23) of the V-ribbed belt (8) or the toothed belt (16) is a woven, knitted or knitted fabric.

14. Article according to one of claims 1 to 13, characterized in that the adhesion promoter forms an adhesive layer.

15. Article according to claim 14, characterized in that the adhesive layer is a film.

16. Article according to claim 15, characterized in that the film is formed from a pressed plastic.

17. Article according to claim 14, characterized in that the adhesive layer is a film.

18. Article according to claim 17, characterized in that the film is formed from a plastic solution.

19. Article according to one of claims 14 to 18, characterized in that the adhesive layer has a thickness of 0.01 mm to 2 mm.

20. Article according to claim 19, characterized in that the adhesive layer has a thickness of 0.01 mm to 1 mm

21. Article according to claim 19 or 20, characterized in that the adhesive layer has a thickness of 0.02 mm to 0.1 mm.

22. Article according to one of claims 1 to 21, characterized in that the adhesion promoter is a Polyolefm.

23. Article according to claim 22, characterized in that the adhesion promoter is polyethylene (PE) or polypropylene (PP), in particular PE.

24. Article according to one of claims 1 to 23, characterized in that in the adhesion promoter additionally particles are incorporated, in particular from the aspect of resistance to chemicals, oils and heat.

25. Article according to claim 24, characterized in that the particles consist of silicone and / or polyurethane (PU) and / or of a fluorine-containing plastic.

26. Article according to claim 25, characterized in that the fluorine-containing plastic polyvinyl fluoride (PVF) and / or polyvinylidene fluoride (PVDF) and / or

Polytetrafluoroethylene (PTFE), in particular PTFE, is.

27. Article according to one of claims 1 to 26, characterized in that the textile support (7, 15, 23) comprises fibers, yarns or monofilaments.

28. Article according to one of claims 1 to 27, characterized in that the textile support (7, 15, 23) partially or completely made of cotton and / or polyester and / or polyamide.

29. Article according to claim 28, characterized in that the cotton is untreated.

30. An article according to any one of claims 1 to 29, characterized in that the elastic base body is a vulcanizate based on a vulcanized rubber mixture containing at least one rubber component and

Blend ingredients.

31. Article according to claim 30, characterized in that the rubber component is an ethylene-propylene copolymer (EPM), an ethylene-propylene-diene copolymer (EPDM), (partially) hydrogenated nitrile rubber (HNBR), chloroprene rubber (CR) , Fluoro rubber (FKM), natural rubber (NR), styrene butadiene

Rubber (SBR) or butadiene rubber (BR) is used, which is used uncut or in admixture with at least one further rubber component, in particular in combination with one of the abovementioned rubber types.

32. Article according to claim 31, characterized in that the rubber component is EPM or EPDM or an EPM / EPDM blend.

33. Article according to one of claims 1 to 32, characterized in that the vulcanizate is peroxide crosslinked.