WO2017162344A1

WO2017162344A1 - Permeation-tight zipper

Info

Publication number: WO2017162344A1
Application number: PCT/EP2017/050764
Authority: WO
Inventors: Andre Overkamp; Jens LÖSCHNER
Original assignee: Contitech Elastomer-Beschichtungen Gmbh
Priority date: 2016-03-22
Filing date: 2017-01-16
Publication date: 2017-09-28
Also published as: DE102016204728A1

Abstract

The invention relates to a permeation-tight zipper (10), which in particular can be used for the production of protective suits, flexible containers, tents, backpacks, outdoor jackets, or tanks. The zipper (10) comprises zipper elements (1) and zipper support tapes (4), wherein the zipper support tapes (4) have the following layer structure: a first outer layer (A1) that is constructed from at least one elastomer; an intermediate layer (Z) having low permeation, which is located between the first outer layer (A1) and a second outer layer (A2) and which is constructed from at least one film; a single-layer or multi-layer reinforcement support layer (F) that is located between the intermediate layer (Z) and the second outer layer (A2); and a second outer layer (A2) that is constructed from at least one elastomer.

Description

description

Permeation-proof zipper

The invention relates to a permeation-proof zipper, which can be used in particular for the production of protective suits, flexible containers, tents, rucksacks, outdoor jackets or tanks.

A fluid-tight zipper z. Ex. In DE 199 24 539 AI described. Here, the zip fastener tapes consist of a textile layer on which a

Cover layer of a synthetic rubber is located.

Although such a zipper may meet the requirements of the permeation and usually also to the media resistance, but it is not sufficiently mechanically resistant. Especially after repeated opening and closing the

Zippers show first signs of destruction on the zipper itself and / or on the material surrounding the zipper in such a way that, for example, cracks appear on the cover layer or it is rubbed off by the zipper members.

It is therefore an object of the present invention to provide a permeation-proof zipper which is not only characterized by a good permeation resistance and

Media resistance, especially against aggressive chemicals, but at the same time has a long life, good tensile strength and good crack resistance. The material surrounding the zipper members, ie the zipper straps, must not be destroyed by these zipper members, in particular if the zipper is pulled open and closed several times. This object is achieved in that the zipper consists of zipper members and zipper straps, wherein the zipper straps contain the following layer structure:

- A first outer layer AI, which is composed of at least one elastomer, and

an intermediate layer Z with low permeation, which is located between the first outer layer AI and a second outer layer A2 and which is composed of at least one film, and

a single-layer or multi-layer reinforcement layer F, which is located between the intermediate layer Z and the second outer layer A2, and

- A second outer layer A2, which is constructed of at least one elastomer.

Surprisingly, it has been found that such a layer structure for the zipper tapes is characterized by excellent crack resistance and

Tensile strength distinguishes. The zipper can be pulled on and off several times without damage even under great force.

The two outer layers AI and A2 consists of a vulcanized or

Un vulcanized rubber compound. As rubber components, all types of rubber known to those skilled in the art can be used. In particular, ethylene-propylene rubber (EPM), ethylene-propylene-diene rubber (EPDM), (partially) hydrogenated nitrile rubber (HNBR), fluorine rubber (FKM), natural rubber (NR), styrene-butadiene rubber (SBR) or butadiene rubber (BR), fluororubber (FKM), chlorosulfonyl polyethylene rubber (CSM), silicone rubber, such as.

Polydimethylsiloxane gum (MQ), polydimethyl / vinylmethylsiloxane gum (VMQ), polydimethyl / vinylmethyldiphenylsiloxane gum (PVMQ), and poly-Y-trifluoropropyl / vinyltriflouropropylsiloxane gum (FVMQ), or chloroprene rubber (CR), either unbleached or with at least one other rubber component can be blended can be used.

For use in protective suits, CR rubber has proved to be advantageous because of its particularly good resistance to chemicals and heat. If a particularly good flame retardance is to be achieved, preference is given to using CSM. In addition, CSM has the advantage that the zipper on the suit can be directly welded mostly by heat and / or pressure.

This eliminates the associated with large, especially time, effort sticking the zipper.

Furthermore, the two outer layers AI and A2 may also contain thermoplastic elastomers. As thermoplastic elastomers (TPE) it is possible in principle to use all TPE known to the person skilled in the art. Special mention should be made here of thermoplastic olefin-based elastomers (TPO), styrene-triblock copolymers (SBS, SIS, SBC), thermoplastic nitrile rubber (TP-NBR), thermoplastic

Natural rubber (TP-NR), thermoplastic fluororubber (TP-FKM), thermoplastic silicone rubber (TP-Q), thermoplastic polyurethanes (TPU), copolymers

Polyetherester (CPE, CPA), Polyether-Blockamide (PEBA), Chlorosulfonated Polyethylene (CSM) or Melt Processible Rubber (MPR). The TPE can also be used in the blend with one or more elastomers.

It is also possible to make a blend of a rubber and at least one

To use thermoplastics. This is how z. For example, a blend of CSM and

Polyvinyl chloride (PVC) as particularly well suited, since this good weldability and chemical resistance can be optimally combined.

The two outer layers AI and A2 additionally contain more in general

Blend ingredients. The other ingredients of the mixture include at least one crosslinker or crosslinker system (crosslinker and accelerator). Other compounding ingredients are usually still a filler and / or a processing agent and / or a plasticizer and / or an aging inhibitor and optionally further additives (for example color pigments). In this regard, reference is made to the general state of the mixing technology.

The rubber mixtures of the two outer layers AI and A2 may each be admixed with a heat- and chemical-resistant filler in powder form. To name is here in particular a fluorine-containing plastic, in particular again polytetrafluoroethylene (PTFE). It is also advantageous if the two outer layers AI and A2 each still contain at least one flame retardant. All flame retardants known to those skilled in the art can be used here. To be strengthened thereby

Flame retardant used, which are free of halogens or halogen compounds and are free of antimony or antimony compounds, and thus can minimize health risks.

The composition of the two outer layers AI and A2 may be the same or different from each other. If they are different from each other, this may relate to the qualitative and / or the quantitative composition.

It is also preferred if at least one outer side, preferably both outer sides, is or are vulcanized. This makes it possible that the entire article does not need to be heated again and at the same time the zipper can still be welded to the article and does not have to be glued. It is thus formed a still very good bond.

The rubber compounds are easy to process and can also be calendered.

The intermediate layer Z is arranged between the two outer layers AI and A2. It must be characterized by a low permeation to be reliable

To seal chemicals. The intermediate layer Z comprises at least one film, but may also be composed of a plurality, preferably two, films. When

Film materials are especially polyamide (PA), polyimide (PI),

Ethylene vinyl alcohol (EVOH), polyvinyl alcohol (PVOH), polyvinyl chloride (PVC), polypropylene (PP), polyethylene (PE), fluoropolymers (FEP, PTFE) or

Polyetheretherketone (PEEK) is used. Of particular importance is polyamide, in particular polyamide 6, polyamide 6.6, polyamide 11, polyamide 12, polyamide 6.10, polyamide 6.12 or copolyamides. The materials mentioned can be used individually or in combination.

If it is a multilayer film, in particular a two-layer film, then at least one layer of a polyamide (PA) of the abovementioned types, a Polyimide (PI), a polymer based on ethylene vinyl alcohol (EVOH), a

Polyvinyl alcohol (PVOH) or a polyetheretherketone (PEEK) constructed.

In particular, the combination of PA / EVOH or PI / EVOH shows a particularly low permeation.

The intermediate layer Z can be prepared adhesive-friendly on one or both sides,

in particular from the aspect of surface activation, in which case, in particular, the etching or roughening should be mentioned here. Of particular importance is the etching. The surface modification or surface treatment by etching is carried out by known chemical or physical methods, for example by means of flame treatment, corona discharge, sputtering, plasma treatment, sodium ammonia process or sodium naphthalene process.

According to the invention, there is still a reinforcement layer between the intermediate layer Z and the outer layer A2. This reinforcement layer, which is preferably made of a textile material, may be formed in one or more layers, with the single-layer design usually being used in terms of weight reduction. The reinforcement layer may be formed as a woven, knitted or knitted fabric, wherein the presence as a fabric is preferred. For the textile material, it is possible to use all natural and synthetic materials known to the person skilled in the art.

Synthetic materials are in particular synthetic polymers, such as polyacrylonitrile, polypropylene, polyester, polyamide, polyurethane, polyphenylene sulfide, polyoxadiazole, aramids, such as p-aramid, m-aramid or co-poly para aramid, polyimide, polyetherimide, polyetheretherketone, polyethylene 2,6-naphthalate, polyphenylene,

Polyphenylene oxide, polyphenylene sulfide, polyphenylene ethers, polybenzoxazoles,

Polyvinyl alcohol in question. The natural materials may be rock wool or asbestos, or cotton, flax or hemp, or wool or silk. Inorganic materials such as glass, ceramics, carbon (carbon), metal or rock, such as basalt, are also conceivable.

The materials mentioned can be used alone or in combination. The reinforcement layer can also be prepared adhesive friendly.

The individual layers can each be connected to one another via an adhesive system H. This is preferably a multilayer adhesive system which may consist of two or more layers. The multilayer adhesive system H preferably consists of the two individual layers H 'and H ".

The layers of the multilayer adhesive system H are at least one

Rubber compound constructed and thus each contain at least one rubber, other mixture components and in each case at least one adhesion promoter. When

Rubbers may be used in any of the types of rubber known to those skilled in the art, with chloroprene rubber (CR) and / or chlorosulfonyl polyethylene rubber (CSM) being most preferred.

If the multilayer adhesive system H consists of two layers, then H 'contains as

Rubber component preferably CR and H "as the rubber component a blend of CR and CSM.

Other compounding ingredients may be fillers, such as carbon black, anti-aging agents, vulcanization systems, etc.

Adhesion promoters may be any of the known adhesion agents known to those skilled in the art. Coupling agents based on isocyanates and / or resins, in particular adhesive resins, and / or adhesion promoters, which are available under the trade names Chemo sil® / Chemlok® / Parlock ™, have proven to be particularly suitable.

The zipper according to the invention can be used in particular for the production of protective suits, flexible containers, tents, rucksacks, outdoor jackets or tanks.

The invention will now be explained with reference to an embodiment with reference to two schematic drawings. FIG. 1 shows a schematic view of the zipper 10 in the closed state. The zipper members 1 and the zipper straps 4 can be seen. The zipper straps are made of two outer layers AI and A2, one

Intermediate layer Z and a reinforcement layer F constructed. The

Zipper straps 4 are welded in a preferred embodiment by means of a sealing tape 3 with a protective suitor 2.

FIG. 2 shows the layer structure 20 of the zipper straps. The

Zip fastener tape contains two outer layers AI and A2 each of a heat and chemical resistant vulcanized rubber mixture each based on CSM and / or a blend of CSM and PVC. Furthermore, this includes

Zip fastener tape an intermediate layer Z of at least one film, for example composed of PA, and a single-layer reinforcing layer F of polyester or polyamide, which is located between the intermediate layer Z and the outer layer A2.

LIST OF REFERENCE NUMBERS

(Part of the description)

10 zipper 20 layer construction

AI outer layer

A2 outer layer

F reinforcement layer

Z interlayer 1 zipper members

2 protective suit

3 sealing tape

4 zipper straps

Claims

claims

1. zipper (10) consisting of zipper members (1) and zipper tapes (4), characterized in that the zipper straps (4) contain the following layer structure (20):

- A first outer layer AI, which is composed of at least one elastomer, and

- A second outer layer A2, which is constructed of at least one elastomer.

2. zipper (10) according to claim 1, characterized in that the

Outer layers (AI, A2) each consist of a rubber mixture, each containing at least one rubber component and

Mixture of singers.

3. zipper (10) according to claim 2, characterized in that the

Rubber blends of the outer layers AI and A2 are each vulcanized.

4. zipper (10) according to claim 2 or 3, characterized in that the first outer layer AI and / or the second outer layer A2 contain CSM rubber and / or a blend of CSM and PVC.

Use of a zipper (10) according to any one of claims 1 to 4 for

Production of protective suits, flexible containers, tents, rucksacks,

Outdoor jackets or tanks.