DE10120620A1 - Multilayered plastic pipe, in particular, for conveying fluid media in heating and sanitary installations comprises at least one multimaterial layer consisting of a polymer with a montmorillonite filler - Google Patents

Abstract

A multilayered plastic pipe for conveying fluid media in heating and sanitary installations comprises at least one layer which is constituted as a multimaterial layer consisting of a polymer with embedded Nanoclay (montmorillonite) processed as a filler element.

Description

The invention relates to a multilayer plastic tube, especially for the transport of fluid media in heating and sanitary area.

Such plastic pipes are already from DE 299 06 035 U1 known. These pipes have sufficient mecha strength that are used to manufacture the pipes Deteten plastics, however, especially at high temperatures temperatures of the media inside the pipes the dif fusion of gases from the air surrounding the pipe into the liquid medium too.

For example, the diffusion of oxygen into the Medium arranged in the line to corrosion of the Surfaces of metallic components lead inside a line system are arranged. The result Detaching rust particles lead to silting up of the Lines, which causes the flow of ge in the lines medium is impaired or possibly completely bloc is cated.

In addition to oxygen, aggressive gases can also enter the medium diffuse into it, causing damage to the inner surface of the pipe cause. This can lead to leaks in the pipes come through which the medium guided in the pipe from the Pipe escapes and considerable damage to the pipe is reversed facilities.

A multi-layer polymer tube for use in central heating systems is described in EP 0 030 091. the like pipes have the disadvantage that they are inadequate  mechanical stability, in particular length stability exhibit.

The pipes are subject to changing temperatures during operation flows, due to which the pipes expand and collapse menziehen. Due to the material properties of the pipes especially at the start of commissioning, that the pipes shrink to a length that is less than the initial length of the pipes. This temperature behavior The pipes can damage the entire pipe system with the attached devices.

It is therefore an object of the present invention, one more layered plastic pipe of the type mentioned create that high mechanical strength and lengths stability and a high resistance to gas diffusion having.

According to the invention, this object is achieved in that at least one of the layers is designed as a multi-component layer made of a polymer plastic and embedded therein, prepared as a filler nanoclay (Montmorillonites). The filler embedded in the polymer plastic is obtained from a type of clay that has very fine, preferably platelet-shaped particles. The filler used in the context of this invention is available as granules from RTP Deutschland GmbH, Siemensstrasse 13 , 35799 Merenberg.

The multi-component layer according to the invention - here and below The one that is made from the polymer plastic and that as a filler prepared layer made of nanoclay (Montmorillonites) for simplicity only referred to as "multi-layer" - has a high barrier effect against gas diffusion. The  Multi-layer reliably prevents penetration harmful gases of all kinds in the interior of the pipe and thus the Contact of the gases with the one inside Medium. Damage to the medium in contact existing components of a line system and the lines is effectively avoided.

The one in the polymer plastic of the multi-component layer embedded filler also results in a high mechanical strength pipe. In addition to a high length stability the tube also has a high breaking strength and a achieved high internal pressure resistance of the tube, the Wall thickness of the pipes compared to conventional pipes have a comparable compressive strength, considerably can be reduced, so that the material requirements for Her position of the pipes is reduced. At the same time, however a flexibility of the pipes necessary for the installation maintained. The use of tubes according to the invention enables light a compact design of corresponding line systems.

The multi-component layer is also moisture-resistant, so that when using the multi-layer as an outer layer also on any separate dampness that may be required protective layer can be dispensed with.

Basically, the number of layers of plastic tubes and the number of multi-component layers and their Arrangement freely selectable. After further training from the Erfin However, the plastic pipe has an inner layer and an outer layer, the outer layer being a multi-material layer is formed. Since the multi-component layer was different ne properties, namely u. a. high internal pressure resistance, high length stability, breaking strength and barrier effect against gas diffusion combined, can on additional Layers that are otherwise required are dispensed with  are to a plastic pipe with the required properties to manufacture. A two-layer pipe also has one only a small size and thus allows space saving installation.

According to an advantageous embodiment of the invention the plastic tube an inner layer, an outer layer and an intermediate layer, wherein the intermediate layer as Multicomponent layer is formed. The arrangement of the more fabric layer between the inner and outer layer ensures that the multi-component layer is permanently in front of the environment influences is protected. Damaging mechanical and che Mixing effects are caused by the inner and outer layers the plastic pipe effectively abge from the multi-layer hold, resulting in increased durability of the multi-material layer results.

According to a particularly advantageous embodiment of the Er are the intermediate layer and a cladding layer as Multi-layer layer formed. The use of two more layers of material increase the material in a special way properties of the plastic pipe such as internal pressure resistance, Length stability, barrier effect against gas diffusion etc. The The outer layer also acts as a moisture barrier and thus increases the life of the plastic pipes in complementary way.

The proportion of the filler contained in the multi-component layer can basically depend on the respective one can be freely selected. It is therefore an optimal one Adaptation of the plastic pipes to the respective application if possible. By using a relatively high The filler can therefore also be used in a simple manner, for example a rigid plastic tube with a very high internal pressure strength are generated. According to an advantageous embodiment  the invention, however, is the proportion of the Filled nanoclay (Montmorillonites) at the Multicomponent layer between 1 and 10 wt .-%, preferably between 3 and 8 wt .-%, in particular about 5 wt .-%.

Such a multi-material layer combines in the different materials are particularly advantageous ca- pacity. In addition to high tensile and compressive strength, a high internal pressure resistance as well as a high fracture strength and a good barrier effect against gas diffusion the plastic tube has sufficient flexibility.

In principle, all can be used to form the multi-component layer polymeric plastics are used. After an advantage adhere to the invention is the polymeric art Multi-layer polyamide fabric. The use of a such material allows in a particularly reliable Way the production of a homogeneous intermediate layer, wel che has no voids that may be closed a reduction in resistance to gas diffusion as well lead to a reduction in mechanical strength can. Furthermore, by using polyamide, the already has a barrier effect against gas diffusion, the Barrier effect of the multi-layer in a complementary manner be increased.

Basically you can stick to the multi-component layer bordering layers of any thermoplastic materials be used so that the plastic tube optimally to the medium flowing through the pipe and to the on the pipe from external influences can be adjusted. After a advantageous development of the invention are those to the Multi-layer adjoining layers, however, made of polyethylene len formed. The use of polyethylene allows due to the low raw material costs a particularly inexpensive  Manufacture of plastic pipes.

The layers can basically be used without using Bin to be cohesively connected. To an advantageous development of the invention are However, layers are cohesively bonded with a binder connected to each other. The binder ensures in particularly advantageously a seamless connection between the individual layers, so that effective structural and property-weakening gaps and a loosening the connection between the layers is prevented.

According to a development of the invention, the binder an adhesion copolymer. An adhesion copolymer ensures particularly reliable a homogeneous bond between the Layers. The thickness of the outside of the inner layer or applied to the outside of the intermediate layer Binder is according to a particularly advantageous th embodiment of the invention 20-50 microns.

According to a preferred embodiment of the invention Multi-layer layer produced in an extrusion process. The Filler is in homogeneous Ver before extrusion division within the melt of the multi-material layer forming polymeric plastic. During the extrusion process the filler is distributed evenly in the multi-material layer.

This embodiment of the invention also ensures ensures that the filler is completely in the multi-component layer is embedded. Spaces as well as areas with only one small amount of the filler, which leads to a weakening of the Structure of the multi-component layer can be effective avoided.  

Exemplary embodiments of the invention are described below of the drawings. The drawings show:

Figure 1 is a sectional view of a plastic tube with three layers.

Fig. 2 is a sectional view of a plastic tube with four layers and

Fig. 3 is a sectional view of a plastic tube with two layers.

Fig. 1 shows a first embodiment of a plastic tube 6 a, the inner and of an outer layer 3 layer 1 and one of the inner layer 3 and the outer layer 1 enclosed between layer 2 is made.

The intermediate layer 2 formed as a multi-layer consists of a polymeric plastic with embedded nano clay (Montmorillonites), not shown here as a filler, and is connected by binder layers 4 , 5 to the outside of the inside layer 1 and the inside of the outside layer 3 .

To produce the plastic tube 6 a, the inner layer 1 is first extruded, to which the binder layer 5 is then applied. Subsequently, the intermediate layer 2 is coextruded onto the inner layer 1 . Subsequently, a binder layer 4 is again applied to the outer side of the intermediate layer 2 . The outer layer 3 is then coextruded onto the intermediate layer 2 .

Fig. 2 shows a plastic tube 6 b, which is formed from an inner layer 1 , an intermediate layer 2 , an outer layer 3 and a cladding layer 7 . The intermediate layer 2 and the cladding layer 7 are designed as a multi-component layer made of a polymer plastic with embedded nanoclay (montmorillonites) prepared as a filler.

The structure of the plastic tube 6 b corresponds in wesentli Chen the structure of the plastic tube 6 a. The additional covering layer 7 is connected to the outside of the outer layer 3 by a binder layer 8 .

Fig. 3 shows a further embodiment, a two-layer plastic tube 6 c with an inner layer 1 and an outer layer 3rd The outer layer 3 is formed as a multi-layer of a polymeric plastic with embedded therein, prepared as a filler nanoclay (Montmorillonites).

The structure of the plastic tube 6 c corresponds essentially to the structure of the plastic tubes 6 a, 6 b, the outer layer 3 being connected directly to the inner layer 1 by the binder layer 4 .

The production of the plastic tubes 6 b, 6 c takes place in an analogous manner for the production of the three-layer plastic tube 6 a.

Claims (10)

1. Multi-layer plastic pipe, in particular for the transport of fluid media in heating and sanitary areas, characterized in that at least one layer is formed as a multi-layer material made of a polymeric plastic and embedded therein, prepared as a filler nanoclay (Montmorillonites). 2. Plastic pipe according to claim 1, characterized in that the same has an inner layer ( 1 ) and an outer layer ( 3 ), the outer layer ( 3 ) being designed as a multi-layer. 3. Plastic pipe according to claim 1 or 2, characterized in that the same has an inner layer ( 1 ), an outer layer ( 3 ) and an intermediate layer ( 2 ), the intermediate layer ( 2 ) being designed as a multi-layer. 4. Plastic pipe according to one or more of the preceding claims, characterized in that the intermediate layer ( 2 ) and a cladding layer ( 7 ) are formed as a multi-layer. 5. Plastic pipe according to one or more of the previously outgoing claims, characterized in that the Proportion of nanoclay (Montmo rillonites) on the multi-component layer between 1 and 10% by weight is. 6. Plastic pipe according to one or more of the previously outgoing claims, characterized in that the  polymeric plastic of the multi-component layer is polyamide. 7. Plastic pipe according to one or more of the previously outgoing claims, characterized in that the the multi-layer layers adjacent to poly ethylene are formed. 8. Plastic pipe according to one or more of the preceding claims, characterized in that the layers ( 1-3 , 7 ) are integrally connected to one another by a binder. 9. Plastic pipe according to claim 8, characterized in that the binder is an adhesion copolymer. 10. Plastic pipe according to one or more of the previously going claims, characterized in that the Multi-layer layer produced in an extrusion process is.