DE102007052044A1 - Pipe lining system - Google Patents

Abstract

The invention relates to the lining of pipes for the renovation of piping systems. As the lining material, a polyurethane prepolymer is provided which is dimensionally stable at ambient temperature. The polyurethane prepolymer is melted and introduced into the tube. It is now created an overpressure in the pipe, so that the lining comes to rest on the pipe inside. The liner is kept under overpressure for a period of time to allow the liner to nestle cleanly against the surface of the pipe. The polyurethane prepolymer stabilizes and solidifies by crystallization alone. The lining becomes dimensionally stable. The final strength and operating characteristics of the lining are achieved through a crosslinking reaction of the lining material over the moisture present in the environment. The lining cures, for example, by the moisture existing everywhere in the ground by itself.

Description

Technical area

The The invention relates to the lining of pipes, in particular for renovation of piping systems.

State of the art

in the Masonry or underground piping, for example for sewage systems, tend with increasing life, especially due to corrosion and abrasion, leaks. moreover The pipes can be damaged by strong vibrations in the soil and / or in the masonry or by faults, which for example, by later construction work in the vicinity be triggered, damaged. Such endangered or damaged pipes therefore require the renovation.

A first possibility of renovation represents the exchange of defective pipe sections. However, if the piping in Earth or masonry obstructed laid, this is the Replacement required exposing the piping, for example by excavation or leaching of masonry, a temporary and costly measure.

One Another approach is to rehabilitate the pipelines without that these must be uncovered or replaced, by retrofitting the pipes with a lining be provided.

For example, in the document DE 197 18 655 C2 describes the renovation of pipes in the so-called "hose-liner process", in which the pipe to be rehabilitated is lined with a tube which consists of a plastic tube in which a woven with reactive resin fabric hose is embedded. Here, the tube system is pressed by means of a pressure-driven inversion process in the canal to be rehabilitated. Maintaining the pressure that will allow the impregnated liner to press against the pipe wall will cure the resin using cold and hot curing systems.

It is mainly used with epoxy resins, as a 2-component system need to be mixed on the spot. Due to the limited pot life There is a certain amount of time pressure because the liner processes within this time and must be laid optimally in the pipe. An afterthought Correction is no longer possible. Further, epoxy resins not elastic, but brittle and can through severe shocks or dislocations damaged so that the pipe will leak again. In drapery of the Liners heat shading systems cause shading, those to a partially incomplete curing of the resin can lead to the wall.

at Moisture is a major irritant to all systems used and is generally careful before using the resin dry out to achieve a good lining result. Cold-curing resins are also not stable in storage and must be mixed directly before use. This is awkward and includes possible errors, such as Einwiegefehler, Blistering and / or insufficient mixing.

Of the Knitted stocking described in the document is elastic and produced when pressed into the tube contours, especially in the outer radius a bow, a noticeable restoring force, which in general In addition, it makes necessary the pressure until it hardens to maintain the resin. To the resin impregnated Pull knit stocking into the tube and for the subsequent To be able to inflate the formation of the inner tube geometry must The knitted stocking after manufacture and before impregnation coated in a further process step with a film become. It must be for all pipe sections to be renovated suitable hoses are used in the production.

Presentation of the invention

In front Therefore, the present invention has for this reason Task posed, a lining, a method of lining a pipe and a method for producing a lining to provide at least the disadvantages of the prior art to reduce.

in this connection it should also be possible, in particular, already existing use technical devices for lining pipes can.

Further It should also be possible, in particular, linings for Simply assemble tubes of different cross sections can.

Solved This is already done by lining up for the job Inside of a pipe wall, the lining for a pipe wall, the method of lining the inside of a pipe wall and the method for producing a lining according to the features the independent claims. Advantageous embodiments are the subject of the respective subclaims.

The invention includes a lining for the inside of a pipe wall, in particular a sewer pipe, comprising a lining material comprising at least one polyurethane prepolymer, wherein the lining material is dimensionally stable at ambient temperature. In one embodiment, at least the polyurethane prepolymer is dimensionally stable at ambient temperature.

• – Bereitstellen einer Auskleidung, welche bei Umgebungstemperatur im wesentlichen formstabil ist,
• – Einbringen der Auskleidung in das Rohr, so dass die Innenseite der Rohrwand zumindest abschnittsweise ausgekleidet ist und vorzugsweise dabei verformt wird und
• – Aushärten der Auskleidung bis zu seiner Endfestigkeit durch eine Vernetzungsreaktion.

Furthermore, the present invention comprises a method for lining the inner wall of a tube, comprising the following method steps:

• Providing a lining which is substantially dimensionally stable at ambient temperature,
• Introducing the lining into the tube, so that the inside of the tube wall is lined at least in sections and is preferably deformed and
• - curing the lining to its final strength by a crosslinking reaction.

In an embodiment, the inventive Lining additionally a carrier on. The carrier forms for the lining material at least in one non-solid state of the lining material a scaffold. The liner in one embodiment comprises a prepolymer with at least one isocyanate end group. The lining material comprises in a further embodiment a polyurethane prepolymer. In a further embodiment, the lining material is included Temperature increase deformable. Contains accordingly the method includes the step of heating the liner, so that the lining is deformable.

moreover lies within the scope of the invention, a lining for a Pipe wall comprising a lining material comprising a fabric or a prepolymer having at least one isocyanate end group and a solidification temperature of less than or equal to 20 ° C, preferably by at least one partial crystallization and / or by at least one partial glazing. Preferably the said prepolymer is a polyurethane prepolymer.

• – Bereitstellen eines ein Stoff mit wenigstens einer Isocyanat-Endgrupppe oder ein Prepolymer mit wenigstens einer Isocyanat-Endgrupppe, insbesondere Polyurethan-Prepolymer, umfassenden Auskleidungsmaterials, welches bei Umgebungstemperatur formstabil ist, und eines Trägers, welcher ein Gerüst für das Auskleidungsmaterial zumindest in einem nicht-festen Zustand des Auskleidungsmaterials bildet und vorzugsweise einen Vliesstoff umfasst,
• – Aufschmelzen des Auskleidungsmaterials,
• – Zusammenführen des Auskleidungsmaterial und des Trägers, so dass das Auskleidungsmaterial zumindest abschnittsweise mit dem Träger verbunden ist,
• – Abkühlen der Auskleidung, so dass der Verbund aus Träger und Auskleidungsmaterial formstabil ist und
• – Aufbewahren der Auskleidung in einer Atmosphäre, welche eine Vernetzungsreaktion des Auskleidungsmaterials, insbesondere zum Erreichen der Endfestigkeit der Auskleidung, zumindest verzögert.

Furthermore, within the scope of the invention, a method for producing a lining for a pipe wall, comprising the following method steps:

• Providing a lining material comprising at least one isocyanate end group or a prepolymer comprising at least one isocyanate end group, in particular polyurethane prepolymer, which is dimensionally stable at ambient temperature, and a support which supports a framework for the lining material at least in a non- forms a solid state of the lining material and preferably comprises a nonwoven fabric,
• Melting the lining material,
• Merging the lining material and the carrier so that the lining material is at least partially connected to the carrier,
• - cooling the lining, so that the composite of carrier and lining material is dimensionally stable and
• Storing the lining in an atmosphere which at least delays a crosslinking reaction of the lining material, in particular to achieve the final strength of the lining.

Under comprising providing the prepolymer or polyurethane prepolymer Lining material according to the invention for one understood that the prepolymer or the polyurethane prepolymer is provided. But it also means that the components for forming the prepolymer or the polyurethane prepolymer to be provided. For example, the polyurethane prepolymer even in a reactor by mixing a polyol and a diisocyanate, and possibly with the addition of additives at elevated Temperature formed and in liquid form in the carrier, For example, a fleece, the hose liner incorporated. The After cooling to ambient temperature solidified Schlauchl liner system can be used with moisture exclusion for longer Time to be stored. Before use, it will be in one embodiment by heating above the melting point of the prepolymer deformable or flexibilized in an oven. In one embodiment thus becomes the lining after its manufacture and before installation stored in the tube in an atmosphere which the Crosslinking reaction at least delayed.

Preferably the lining according to the invention can be produced, in particular produced by the invention Method. Preferably, the invention Method suitable for producing the inventive Lining.

According to the invention the term polyurethane is then given when in the prepolymer or at least one urethane group is located in the polymer chains.

One Prepolymer is in a broader sense a linear and / or branched, higher molecular weight substance. This substance is complete or block by block of regular repeat units built up. It carries reactive groups at the chain ends. Especially At the chain ends, the prepolymers can still too connect larger units or networks. A prepolymer thus represents the precursor of a polymer.

The Prepolymers or the polyurethane prepolymers are preferably with terminal isocyanate groups as functional groups or with at least one terminal isocyanate group as a functional group provided, for example, under the action of moisture, to highly stable, long-chain molecules, the Polymer can be constructed and optionally also crosslinked. The lining material is thus characterized in that a prepolymer having at least one isocyanate end group used becomes.

The Lining material or the prepolymer, in particular the polyurethane prepolymer has a solidification temperature of less than or equal to 20 ° C, preferably by at least one partial crystallization and / or by at least a partial glazing on. The solidification temperature is while above the ambient temperature.

The average molecular weight of the prepolymers or polyurethane prepolymers used in the invention is in the order of about 1000 g / mol to about 20,000 g / mol, preferably in the order of about 2000 g / mol to about 5000 g / mol. The average molecular weight of the prepolymers or polyurethane prepolymers also influences, among other things, the viscosity of the lining material. The prepolymers or polyurethane prepolymers used according to the invention have a viscosity of from about 300 mPas to about 100,000 mPas, preferably from about 1,000 mPas to about 10,000 mPas, in a temperature range from about 40 ° C. to about 80 ° C. The lining material or the prepolymer, in particular the polyurethane prepolymer, at a temperature of about 50 ° C has a viscosity of 300 mPas to 30000 mPas, preferably from 1000 mPas to 10000 mPas. The viscosities are determined by the Brookfield method ( DIN EN ISO 2555 ).

One Prepolymer consists of at least one polyol or a mixture more polyols or comprises at least one polyol or a mixture several polyols, in particular with at least two OH end groups. Preferably, a polyurethane prepolymer is a prepolymer that from at least one, in particular short-chain, preferably largely unbranched, OH-terminated polymer or polyol by reaction with a polyvalent isocyanate, preferably a diisocyanate, in a more than stoichiometric ratio is implemented. The polyol preferably has a number average molecular weight of about 500 g / mol to about 20,000 g / mol preferably from 1000 g / mol to 4000 g / mol. In one embodiment the OH-terminated polymer is at least one polymer selected from the classes of polyethers, polyesters, polycaprolactones and polycarbonates. In particular, the OH-terminated polymer is a copolymer comprising a polymer or more polymers of the aforementioned polymers.

to Formation of the polyurethane prepolymer becomes the polyol, preferably the polyol described above, with the polyvalent isocyanate, preferably a diisocyanate, in a stoichiometric ratio from 1: 2 to 1:10 based on the moles of the functional groups -OH and -NCO implemented in individual cases but also a more extreme relationship makes sense. Preferred are ratios from 1: 3 to 1: 5 by stoichiometric ratio.

The Polyol, preferably the polyol described above, becomes so with the polyvalent isocyanate, preferably a diisocyanate, implemented that largely only short-chain polymers, preferably Polyester, polyether and / or polycarbonates, each having at least a urethane and an isocyanate function at each chain end arise. This results in an NCO content or a content of free isocyanate functions in the lining material of about 1-20% by weight of the prepolymer composition, preferably from about 3-10% by weight. these can z. B. infrared spectroscopy by an intense band in the area from 2,200 to 2,300 wavenumbers can be detected as intense band and connect the individual prepolymer chains under the action of Water by formation of urea bridges with elimination of carbon dioxide. In the production of polyurethanes, the isocyanate reacted with the active hydrogen-containing compound.

to Formation of the prepolymer is the at least one polyol or Mixture reacted with at least one polyisocyanate. The polyisocyanate is selected from the group of MDI (methylene diphenyl diisocyanate), especially in isomerically pure form or as a mixture of isomers, TODI (Dimethyl-biphenyl diisocyanate and / or ditolyl diisocyanate), PPDI (Paraphenylene diisocyanate), NDI (naphthylene diisocyanate), TDI (tolylene diisocyanate), H12MDI (methyldicyclohexyldiisocynate), IPDI (isophorone diisocyanate), HDI (hexamethylene diisocyanate) and / or trifunctional condensates hexamethylene diisocyanate of the biuret or trimer type (isocyanurate).

The prepolymers or the polyurethane prepolymers may also be referred to as reactive resin. The reactive resins used are preferably all prepolymers whose solidification temperature or glass transition temperature, in particular their crystallization point, is above the ambient temperature of the channel in which the pipe to be lined is located. A crystallization of the polyurethane prepolymers can in this case in the so-called soft segment of the prepolymer, which, for example, from the short-chain polyester, polyether, or polycarbonate chain, or in the isocyanate range, preferably at the ends of the prepolymer chains lie. Thus, the soft segment and / or the isocyanate region of the polyurethane prepolymer has or have a solidification temperature or a glass transition temperature which is above an ambient temperature of the tube, so that here the lining material is dimensionally stable at ambient temperature by solidification.

The Lining is also referred to below as a hose liner. The time span in which the hose liner, in particular the Lining material, deformable or flexible and in particular so that it can be installed is at least given by the cooling rate and the solidification time, such as the crystallization time, of the lining material or liner resin. The latter is more or less kinetically delayed, so that the hose liner initially also below the solidification temperature, as the crystallization temperature, still malleable or flexible is and only slowly, d. H. gradually, frozen. The solidification speed is due to the kinetics of the system. It can therefore over the formulation, in particular comprising the molecular weights, the components and / or crystallization aids, set or to be influenced.

When Diisocyanates are particularly suitable for the well-crystallizing, aromatic diisocyanates. The first chemical compound to form of the polyurethane prepolymer containing at least one isocyanate group has at least one chemical compound selected from the group of NDI, PPDI, TODI and 4,4'-MDI. Will with a worked well crystallizing soft segment, so can also at ambient temperature non-crystallizing diisocyanates such as TDI and the aliphatic diisocyanates HDI, IPDI, H12MDI, TMXDI, as well as mixtures of the occurring structural isomers, as well as be used by different diisocyanates.

When Soft segment are preferably the polyols from the group the polycarbonates, such as hexamethylene and / or trimethylene carbonates, polycaprolactones, Well crystallizing polyester, such as ethylene, butylene and / or Hexamethylene. The molecular weight of the polyols should be in the range of 400 g / mol to 6000 g / mol, preferably at about 1000 to 3000 g / mol lie. Other soft segments can be found in the field of derived from aromatic polyester. Of these, in particular the phthalates and / or Terephthalate whose glass transition temperature in polyurethane above the ambient temperature. The second chemical compound for forming the polyurethane prepolymer, the has at least one hydroxyl group is at least one chemical Compound selected from the group of polycarbonates, Polycaprolactones and polyesters.

In One embodiment of the invention is the lining material, in particular the polyurethane prepolymer, reactive to moisture. Thus, the lining material, especially the polyurethane prepolymer, under the influence of water, at least through a network of his Constituents curable. The lining material is thus preferably a reactive 1-component system.

Under the ambient temperature is understood to mean the temperature range which in the pipe in which the lining is to be introduced, in particular in the process of lining and / or during operation of the pipe, is present or created or even the temperature range, which prevails when storing the lining after its manufacture. This temperature range is also affected by the environment, for example influenced, in which the pipe is laid or even laid should. For example, the temperature in the soil is from a depth of about 1 m is substantially uniform and amounts in about 10 ° C.

According to the invention a body, here the lining, in particular the lining material, as dimensionally stable, if it is among the existing in the environment Conditions without the influence of additional external Forces do not change its shape substantially or hardly. The body has its own stability or is stable. In one embodiment, the dimensional stability by a solidification of the lining, in particular of the lining material, achieved. The solidification is carried out by at least a partial crystallization and / or by at least a partial glazing of the lining, in particular of the lining material. According to the present The invention is understood to be dimensionally stable also that a body without an effect of additional external Forces do not collapse. A body can be dimensionally stable but still deformable. For example, can according to the present invention, a round tube due to its own weight also take an oval shape. It However, it does not collapse in such a way, so that for example opposite areas can come into contact.

in the dimensionally stable state, a crosslinking reaction has not yet been used to have. The final strength or, preferably, final, operating properties the lining is or will, however, only over one Crosslinking reaction of the lining, in particular of the lining material, reached. The dimensional stability is essentially not that Result of a crosslinking reaction.

In In one embodiment, the liner is a tube educated. A tube is preferably a conduit for Liquids, vapors, gases and / or fluid-solid mixtures. In one embodiment, the tube is a particular one cylindrical hollow body made of metal, stoneware, Clay, cement, glass, rubber and / or plastic can. A pipe is also understood to mean a pipe which, in the sense of a gutter, opened to an upper side is. Under a pipe according to the invention but also understood a container.

At the Inserting the liner itself may be the liner to concern come on the inside of the tube. In general, however, this will not be the case. Thus, after the insertion of the liner a pressure is applied in the tube so that the deformable lining at least in sections, to rest on the inner wall of the pipe comes. Preferably, then the liner cools to a Temperature down or is cooled, leaving the lining material is dimensionally stable.

In the embodiment in which the lining is a carrier includes, the lining material is materially bonded to the carrier connected is. The wearer can work with the lining material be coated, so that the lining material in this case at least partially applied to the carrier and / or with the Lining material soaked in, so in the carrier existing hollow or intermediate spaces at least partially filled with the lining material. The watering can also be referred to as impregnation. The Coating or soaking can be done in known devices, for example, by squeegees, watering and optional final Squeezing on rollers, by spraying, printing and / or after inversion process, are performed.

In In one embodiment, the carrier is at least partially porous. Preferably, the carrier an at least partially porous body or the carrier comprises a porous material. Under porous is understood according to the invention, that the carrier has areas or spaces that at least partially fillable with the lining material are. The carrier is or comprises in one embodiment a fiber material, preferably a textile material. For example the carrier is formed as a sheet material. As a favorable for the carrier or the lining Embodiment has proven to be a nonwoven fabric. Because The properties of the nonwoven fabric can be during its production specifically influenced or to the requirements of his later Use as a lining material to be adjusted. According to the The present invention also provides a felt under a nonwoven fabric. in particular a needle felt, understood.

The parameters such as basis weight, material, thickness and / or width of the backing or nonwoven fabric are determined depending on the requirements of the lining, in particular the properties of the polyurethane prepolymer, and / or the cross section of the pipe. Here, the nonwoven fabric has in particular a basis weight of 30 to 3000 g / m ² , preferably from 50 to 1000 g / m ² . Furthermore, the nonwoven fabric has in particular a thickness of 0.4 mm to 200 mm, preferably from 0.6 mm to 60 mm. The nonwoven fabric is formed by fibers comprising at least one material selected from the group of PET, PE, PP, PA6, PA6 / 6.6, CV and PAN. The specified materials may also be present as a mixture and are not exhaustively enumerated. Admixtures of mineral fibers such as glass fibers, organic fibers such as hemp, flax, cotton and / or sisal, and / or metallic fibers are possible.

Of the Cutting the nonwoven fabric is carried out according to the extent of the lining Tube. As nonwovens produced with a width of up to about 6 m are, for example, linings for Round tubes with a radius of up to about one meter easy be manufactured and have only one seam. According to the size the pipe to be lined has a lining one or more Seams. Such a lining is thus not seamless.

Of the nonwoven fabric according to the invention is in two directions, parallel and transverse to the machine direction, preferably evenly, deformable. Thus, also a carrier, which as a Pipe is formed, both in the direction of the tube axis as well transversely deformable.

Of the Nonwoven fabric can be designed such that at an elongation essentially no or only low restoring forces occur, causing a deformation, for example, an extension or compression, essentially preserved. The nonwoven fabric is thus not elastic in this embodiment. Of the Nonwoven fabric according to the invention is in such Execution essentially or almost plastically deformable. He can thus approximate plastic properties have.

It can also be produced nonwovens, which have a provision of less than 30%, preferably less than 15%. The provision here describes the return of the nonwoven fabric after a tensile load and was according to the tensile test standard DIN EN 29073-3 determined. It is here a test strip to at least 90% of the initial length and after the Kraftwegnah measured the extent to which the test strip relaxes. The standard requires 90% elongation until the power is removed. In the present case was tested at 100%. It is achieved with a nonwoven fabric according to the invention a provision of about 10% both longitudinally and transversely to the machine direction. Thus, the nonwoven fabric used according to the invention has a better adaptability to the known linings, for example to a variable tube geometry.

This plastic property is particularly advantageous when the nonwoven fabric is mechanically solidified. Thus, a mechanically bonded nonwoven fabric having a defined extensibility in the longitudinal and transverse directions can be used as the carrier system. By suitable selection of the raw materials and / or the fleece laying and / or the mechanical consolidation, the vorgzusweise plastic extensibility of the carrier nonwoven fabric can be adapted to the requirements, especially in pipe bends. The properties of the nonwoven fabrics, in particular their non-elastic behavior, is very advantageous, for example, when the lining is introduced into bends. For in a curvature, the lining is simultaneously compressed in the inner radius of curvature and stretched in the outer radius of the curvature. In a substantially elastic behavior, an increasing stretch would be associated with an increasing restoring force, so that an unwanted detachment of an already adhering liner may be possible. The solidification technique is preferably to be selected so that under tensile load the individual fibers in the nonwoven fabric can slide together without dissolving the fiber composite. In this case, in particular, a hole formation in the nonwoven fabric can be prevented. The nonwoven fabrics used according to the invention have an elongation at break of 40% to 300% and / or an elongation at break across of 40% to 300%. Furthermore, the nonwoven fabrics used according to the invention have a maximum tensile force along 50 N / cm to 200 N / cm and / or a maximum tensile force transversely of 50 N / cm to 200 N / cm. The values are particularly fulfilled for the fiber raw material polyester. The values were checked by a standard test method DIN EN 29073-3 determined. The retention of the textile character of the nonwoven fabric with simultaneous reduction in thickness under tensile load in pipe bends can be ensured by means of suitable mechanical web bonding processes. It is thus possible to use a substantially irreversibly extensible or deformable and / or impregnatable nonwoven fabric which is particularly suitable for bending.

Of the Nonwoven fabric is constructed in one or more layers. It consists of fiber and / or filament nonwovens which are thermally and / or mechanically, for example, by needles, sewing and / or water steel, connected and / or solidified. The individual layers of the Nonwoven fabrics are designed according to their tasks. she Thus, for example, absorbent, weldable, conductive, radiation-curable and / or heat-sealable be. It can in this case between the individual layers interfaces exist. However, transitional or form gradient areas between the individual layers, in which the material composition preferably continuously changes.

Around to make the non-woven fabric more absorbent, for example, he can additionally with a preferably aufgadelelten Be fibred be occupied. This batt is supposed to be with the reactive resin adhere and preferably not be biodegradable. For the batt are, for example, CV, PAN, polyolefins, such as PE and / or PP, polyesters, such as PET, PBT and / or PTMT, and / or polyamides, such as PA6, PA6 / 6.6 and / or PA11. The specified materials may also be present as a mixture and are not exhaustive enumerated. Furthermore, for special Applications include mineral fibers, such as glass fibers, inorganic and ceramic fibers, as well as metal threads are incorporated.

In In another embodiment, the lining is complementary at least one preferably flexible film. This one is in one first embodiment on the outside of the Lining arranged. As an alternative or supplement For this purpose, the lining has a preferably flexible film, which is arranged on the inside of the lining. The foil is or the films are particularly suitable for the lining to stabilize and / or protect, in particular ago a lining or bleeding of the lining material in the liquid-viscous Status. However, the film should be permeable to water molecules or steam to be a transport of moisture and a To enable crosslinking of the lining material. The Inside of the lining describes the side, which is the inside facing the pipe wall or the external environment is. Accordingly, the outside describes the side, which faces the interior of the tube. The position of the foil or the films describes their arrangement on the liner before the introduction into the tube. If necessary for insertion into the pipe is carried out to be described inversion process takes place a reversal of the arrangement.

The lining, in particular the carrier and / or the lining material, and the film are in one embodiment connectable to each other, in particular materially connected. Preferably, the lining and the film already form during the installation of the lining in the pipe Bonding and not only by curing of the lining material after insertion into the pipe.

Becomes the film already before insertion into the pipe or before the introduction of the lining material on the carrier applied, the film may, for example, on the support be laminated. The film can locally as semi-finished or laminated over the entire surface of the produced nonwoven fabric become. Furthermore, the film can be extruded on the carrier be. Here, the film can also be used in nonwoven production by a continuous, reactive casting process as thin polymer film are applied to the nonwoven fabric. The polymerization takes place on the nonwoven fabric. One more way consists of applying a polymer solution to the nonwoven web spray. By evaporation of the solvent A dense polymer film is formed on the nonwoven fabric. As another Possibility offers the application of the film on the Carrier in the reactive process. On the nonwoven fabric is In this case, the film applied by using the casting process a low viscosity, yet reactive polymer raw material mixture on the Nonwoven fabric is sprayed on. The polymerization takes place on the nonwoven fabric.

The Film has one depending on the requirements average thickness of about 5 microns to 500 microns, preferably from about 10 μm to 100 μm. In one embodiment the film is essentially of the same components as built up the lining material. Preferably, the film is made from one or the film comprises a polyurethane polymer or a Polyurethane prepolymer.

When Film material may be an equally deformable film, preferably made of thermoplastic polyurethane (TPU), which are already used is applied in the production of nonwovens and in hose-liner production, preferably by hot air welding, in addition acts as an adhesive film, which results in a tight weld. Additional sewing or gluing operations are then no longer necessary. This TPU film forms after installation of the Tube liners and the curing of the resin through their good bondability a firm bond with a smooth and indissoluble Surface.

Around to increase the sealing and / or the strength of the connection, Can be added on the seam or weld at least one band or sweatband be applied. The tape may be on the inside and / or outside of the Be arranged lining. It is also possible, exclusively to use a sweatband to connect the liner.

For example is also the film under the influence of moisture through a Crosslinking of its constituents curable, so that the film is involved in the crosslinking reaction, and preferably also forms a networked composite with the lining. The foil can be present as a prepolymer film.

In Another embodiment includes the lining material a complementary longer chain polyurethane prepolymer as an additional ingredient. The longer-chain Polyurethane prepolymer is based on the same or similar Base like the actual polyurethane prepolymer. Under one same Base is understood to be the longer-chain component having the same repeating units in the chain. By the addition of longer chain prepolymer becomes the initial strength increases and cracking in the solidifying lining material reduced. For example, a polyhexamethylene carbonate based prepolymer obtained by an excess of MDI with this endcapsulated and therefore in its chain length on the length of the polyol plus two units of diisocyanate is limited, thereby be strengthened by a share is added, which consists of the same polyol, which with a very small excess of diisocyanate to a highly viscous prepolymer was reacted, thereby several polyol units in the chain that has individual MDI units are connected.

Also for reducing cracking in the solidifying lining material For example, rubber particles may be dispersed in the lining material. Be the rubber particles in a fine dispersion of the prepolymer added and / or a rubber particle-containing polyol to a Processed prepolymer, then forms the prepolymer during solidification no big cracks anymore. The rubber particles can by grinding crosslinked elastomer into a powder, or by crosslinking of the particles from the preparation in emulsion coagulation (microgels). The content of elastomer particles can be varied within wide limits from 0 to 25 wt.%.

Farther Can the lining material as another ingredient yet Ether polymer, preferably an ether prepolymer added. A heterogeneous prepolymer consisting essentially of polycarbonate consists, but in addition still shares of ether prepolymer are added, also has a much lower slope for the formation of cracks due to shrinkage. This ether prepolymer can for example, by reaction of a polypropylene glycol, a Polypropylene-polyethylene glycol copolymers, or a polytetramethylene glycol with a similar amount of any diisocyanate getting produced.

To speed up the solidification or crystallization may be the lining material Nucleating agent added. These can be represented by the large group of inorganic or even organic and polymeric fillers.

In Another embodiment may be in the carrier and / or in the lining material for accelerating the curing or crosslinking may still contain a water-donating component.

The Water-donating component in this case comprises in one embodiment hydrophilic ingredients, preferably fibers. For the acceleration the curing, the carrier, in particular formed as a nonwoven fabric for hose liner production, by hydrophilic fibers, for example by a proportionate use of cellulose fibers, be moistened. The resin is hereby preferably be incorporated into the hose on site. It is, however no mixing technique necessary, since this is the same, homogeneous Prepolymer acts.

The Water-donating component can be an alternative or supplement also be designed as a water-dispensing micro-capsule. Examples for possible capsule materials include gelatin and / or Alginates.

Farther can be used to speed up the networking by moisture as a supplement or as an alternative also locally a water-supplying filler be incorporated. These are, for example, moist cellulose flakes and / or salts containing water of crystallization. Because a surplus does not lead to problems, but only to a complete Networking, a deficit at best to a slightly slower Networking without compromising the end result will be no special demands made on the quality of mixing. This is very suitable for work on a construction site.

moreover may preferably after the introduction of the liner into the tube hot steam will be routed into the pipe, so that the cross-linking, at least on the surface of the lining, is accelerated. In In another embodiment, the lining material as a further constituent nor a UV-sensitive crosslinking agent at least have on the surface. After the insertion of the lining a UV lamp is moved through the tube so that the cross-linking, at least on the surface, the lining, by the UV-sensitive Crosslinker is accelerated.

The Lining is advantageously before a complete Crosslinking of the lining, in particular of the lining material, re-deformable by heating, so that when introducing the lining resulting defects are correctable.

in principle The present invention can be used for pipes of all diameters be used. A restriction arises only for Tubes that are too small in diameter, leaving the lining can no longer be introduced.

One Applying the lining according to the invention Filling and / or a fiber-spray process is also in pipes possible with correspondingly large diameters. The fibers are in this case so-called short fibers and preferably have an average length of about 5 mm.

The Invention also includes a lining which can be produced, manufactured in particular, is according to one of method according to the invention described above.

Farther is within the scope of the invention, a tube which at least partially on its inside and / or on its outside one has lining according to the invention and / or auskleidbar, preferably lined, is by one of the above described inventive method.

Further the invention includes the use of a lining material, which is substantially dimensionally stable at ambient temperature and which preferably comprises a polyurethane prepolymer for lining the inner wall and / or the outer wall of a pipe and / or for making a lining for a pipe.

Based the embodiments described below the invention explained in detail. The embodiment 1 is based on a lining, which as a lining material two contains different polyurethane prepolymers. The cited However, descriptions are not limited to these embodiments limited.

Embodiment 1

When Carrier is initially a fabric, preferably a nonwoven fabric provided. To improve the stability and for protection, in particular against expiry of the subsequent one Process step to be introduced liquid-viscous lining material, is a film, preferably made of polyurethane, on one side of the Nonwoven fabric laminated.

From the sheet carrier, which is connected to the film, a hose, beispielswei se by a "rolling up" or folding the carrier, shaped. The carrier thus essentially has the shape of a tube which can be inserted into a tube to be lined. The tube is in this case preferably shaped such that the film is arranged on the outside of the tube and forms a kind of skin for the wearer. The formed as a tube molding is hereinafter also referred to as a hose liner. Preferably, the carrier and / or the film are weldable, so that the molded tube can be firmly connected at the junction by welding. The connection point of the carrier preferably has an overlap. This overlap is on the order of 5 mm to 10 mm. Thus, in particular, the formed tube or liner has at least one seam.

to Formation of the lining material becomes first a first Polyurethane prepolymer prepared by adding 900 g to 1100 g, preferably 1000 g, polycarbonate diol with a molecular weight of 1000 g / mol, for example Ravecarb 102 from Enichem or UH100 from ÜBE, at about 120 ° C heated and stirred 540 g to 660 g, preferably 600 g, TODI be added. The mixture is after complete melting of the TODI kept at about 120 ° C for about 30 min. Then Let it cool to about 80 ° C.

It Now, a second polyurethane prepolymer is produced. This is a longer chain compared to the first prepolymer Prepolymer on the same polyol basis. It is made by 180 g to 220 g, preferably 200 g, polycarbonate diol with the molecular weight 3000 g / mol at 120 ° C with 36 g to 44 g, preferably 40 g, TODI added and also stirred for 30 min.

The Both prepolymers are mixed and together form an embodiment the lining material according to the invention. The specified amounts are selected by way of example. To receive of a different amount, the above amounts will be understood scaled to each other in the appropriate proportions.

The For example, as a hose liner shaped liner an immersion in a kind of basin containing the lining material, be "filled". The lining can also with the filled with liquid-viscous lining material become. For this purpose, the hose liner is in a first step closed on one side. Then the inside of the hose is with filled the lining material. The hose is in closed to a next step on the other side. thereupon the hose will improve the distribution of the lining material "squeezed" or calendered. By optionally applying a negative pressure a suction effect is generated, which still supports the distribution can.

There The carrier is a nonwoven fabric and thus cavities has, are the existing cavities in the carrier at least partially filled with the lining material. The carrier is now connected to the lining material. It forms a framework for the lining material in its liquid-viscous state.

Of the Hose can now open again on one side or on both sides and remove the excess lining material The lining is now cooled or left Just cool, preferably to ambient temperature. The Lining material is selected to be included in Ambient temperature is dimensionally stable. Preferably, the dimensional stability by solidification or crystallization of the lining material reached. Here, the crystallization temperature of the lining material, here the polyurethane prepolymer, above the ambient temperature. The liquid-viscous lining material is now firmly with connected to the carrier.

To the cooling and crystallization of the lining material is the impregnated hose liner with moisture seal for months storage stable. By the second, longer-chain prepolymer can be an initial brittleness and the cracking issue the solidifying or crystallizing mass significantly reduced become.

In this embodiment of the invention is thus used as a lining material, in the formation of a resin, a moisture-reactive and thus hardening Polyurethane prepolymer system used. By the chosen Prepolymer system precludes prior mixing Place. The hose liner may, for example, in an at least opposite Moisture insulating container transported to the construction site where the canal to be rehabilitated is located. The hose liner can after a melt directly into the canal to be rehabilitated or retracted or introduced into the pipe to be rehabilitated. Of the Hose is only in an oven before use heated to about 60-70 ° C. The prepolymer resin is melted by it. The lining becomes deformable.

The now deformable hose liner is inserted or pressed into the pipe to be rehabilitated. This happens, for example, by an inversion process. The liner or hose liner is closed on one side and the other end slipped over the pipe inlet. Now there will be a pressure difference between the interior of the pipe and the environment so that the hose liner is retracted by everting it into the pipe. By everting the foil is now arranged inside. Another method for introducing the tube liner into the tube is a "simple" lining of the liner in which the outside and inside are not inverted. If, as described above, the film should be arranged on the inside after the lining has been introduced into the pipe, a smooth surface of the lining advantageously forms. In such a case, the film is preferably also permeable to moisture so that the final crosslinking of the lining material by the film is not prevented. In addition, the film, regardless of their arrangement, also participate in the networking.

It Now an overpressure is applied in the tube, so that the Lining, which still deformable lining material and comprises the deformable carrier, "inflated" and the Plant is brought to the inside of the pipe. The hose liner will now for a certain time, preferably for a few hours, kept under slight overpressure with it he neatly touches the surface of the pipe. The Prepolymer stabilizes and solidifies due to solidification or crystallization by itself within a few hours. The Applying the print can already be stopped when a sufficient solidification of the lining material is achieved so that the lining no longer collapses, So it is dimensionally stable. The networking needs at this time but not yet used. The dimensional stability is thus essentially not the result of a crosslinking reaction. The final strength or, preferably, final, operating properties the lining is or will, however, only over one Crosslinking reaction of the lining material, in particular by the humidity present in the environment. The lining cures, for example, by those in the ground everywhere existing moisture and / or moisture from the interior the flooded canal by itself. Such a reactive system combines very well with surrounding, old pipe material, such as stoneware, Concrete or PVC.

The Forming a fixed lining runs according to the invention, so to speak in a kind of 2-step procedure. The by the cooling the lining to ambient temperature or to a temperature of the lining material below the glass transition temperature conditional solidification or crystallization of the lining material causes a solidification of the lining. The final strength, however, becomes not achieved by the solidification of the lining material. The solidified lining material is still quite brittle and not shockproof. The final properties or the operating characteristics, in particular the final strength, the lining, is going through a Moisture initiated crosslinking reaction of the lining material brought about.

The, relative to the ultimate strength to be achieved, relatively fast incipient solidification or crystallization of the lining material gives the lining dimensional stability or its own stability. Thus, the pressurization can be kept quite short. If no external pressure is applied z. B. by groundwater, in which case the height of the water column to take into account, the internal pressure can be already after 2-3 Hours are completed because the hose liner no longer occurs. This is in contrast to the known linings which are in the Generally still liquid at room temperature or ambient temperature and a pressure must be maintained until the due to a crosslinking dimensional stability or curing the lining material is reached.

It also eliminates the previous mixing. The system can over be processed for any length of time. This can be done difficult applications can be an advantage. The invention Reactive 1k resin saves on-site mixing right before application. The prepolymer system is more or less long shelf life and depending on the system for example, can be melted the day before application and then be applied. The system gets its initial stiffness and the associated stability by solidification or crystallization of the prepolymer and the excess of diisocyanate, see above that after a few hours the canal will be flooded with water again can. Thereafter, the mass reacts by widely available Moisture over several days to a hard, but still elastic mass made solid and tight with the surface connected to the renovated pipe. However, the required Pressurization with known liners considerably shortened.

One Another advantage of a system that is due to solidification or crystallization pre-consolidated or dimensionally stable, is the possibility in the beginning, as long as the material is not yet cross-linked is, by local heating with hot air, for example by to soften and correct a robot, a pipe site. This can be a big advantage especially when draping be.

Embodiment 2

The nonwoven fabric used is the same as in the above embodiment 1. This is in a corresponding manner with a TPU film with a Thickness of about 50 microns laminated and welded into a tube.

When Reactive resin is a prepolymer prepared from 100 parts of polycarbonate diol with a number average molecular weight of 2000 g / mol, such as Desmophen C2200 from Bayer Material Science and / or UH200 from UBE. It is at about 120 ° C heated.

the Polyol will be 30 to 50 parts, preferably 40 parts, substantially crystalline, substantially isomerically pure 4,4'-MDI, such as Desmodur 44 MC from Bayer Material Science with stirring added. After about 30 minutes of reaction time left Cool it to about 70 ° C. It now has one Viscosity of about 3000 mPas. The prepolymer can now be used in this form as a reactive resin.

The specified amounts are selected by way of example. To receive of a different amount, the above amounts will be understood scaled to each other in the appropriate proportions.

Of the Hose liner is tightly closed at one end. Then that will be Prepolymer filled in the tube sealed at the end. About 0.5 kg to 3 kg, preferably 1 kg to 2 kg, prepolymer or polyurethane prepolymer have per meter hose for a pipe with a medium Diameter of 100 mm proved to be advantageous. This is especially true for the system described above. The amount scales in particular with the circumference of the tube, for example with the product from π and the mean diameter.

Of the Hose will now be at the second end with a connection tube provided and sealed. With the help of a vacuum pump is the Air preferably evenly in the evacuated hose distributed. Then the system can be taken off the vacuum pump.

Of the Hose can now be used directly and for example by means of an inversion in a lining, in particular to be rehabilitated, tube are introduced. The hose can but even after closure in a moisture protected Container, at room temperature for several weeks, at temperatures below 0 ° C over several Months to be stored. For use, the solidified tube is in an oven, for example overnight, to about 70 ° C heated. This melts the resin and the hose becomes again flexible or deformable. He is now ready for the application.

To pressing the hose liner into the pipe at a Ambient temperature of, for example, about 15 ° C is an overpressure from about 200 to 400 mbar for about two hours to obtain. Then the resin is crystallized so far that the hose liner is sufficiently stable. Curing to a stable and shockproof inner tube via the following four weeks due to an entry of moisture inside the Pipe and possibly also on outer walls, for example in the case of concrete pipes, in general always exists.

The The aforementioned period of two hours is considerably reduced against the known systems, in which the stability of the Final strength corresponds and only via a network is reached, whereby the overpressure correspondingly long must be maintained.

It It will be apparent to those skilled in the art that the described embodiments to be understood by way of example. The individual features can also be combined with each other. The invention is not on these are limited but can be more diverse Way can be varied without departing from the spirit of the invention.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 19718655 C2 [0005]

Cited non-patent literature

• - DIN EN ISO 2555 [0024]
• - DIN EN 29073-3 [0045]
• - DIN EN 29073-3 [0046]

Claims (44)

Lining for the inside of a Pipe wall, in particular a sewage pipe, comprising a lining material, which comprises at least one polyurethane prepolymer, wherein the Lining material is dimensionally stable at ambient temperature. Lining according to the preceding claim, characterized that the lining material is a reactive 1k system. Lining according to one of the preceding claims characterized in that the lining material has a content of free isocyanate functions between 1% by weight and 20% by weight, preferably between 3% by weight and 12% by weight. Lining according to one of the preceding claims characterized in that the polyurethane prepolymer at least a polyol or a mixture of several polyols, in particular with at least two OH end groups selected from the class polycarbonates, polyesters, polycaprolactones and / or polyethers. Lining according to the preceding claim, characterized the polyol has a number average molecular weight of 500 g / mol to 20,000 g / mol, preferably from 1000 g / mol to 4000 g / mol. Lining according to one of the preceding claims characterized in that the at least one polyol or the Mixture is reacted with at least one polyisocyanate. Lining according to the preceding claim, characterized the polyisocyanate is selected from the group of MDI, in particular in isomerically pure form or as mixture of isomers, TODI, PPDI, NDI, TDI, H12MDI, IPDI, HDI and / or trifunctional Condensates of hexamethylene diisocyanate, preferably biuret or trimmer type. Lining according to one of the preceding claims characterized in that the lining material has a solidification temperature of less than or equal to 20 ° C, preferably by at least one partial crystallization and / or by at least a partial Glazing, has. Lining according to one of the preceding claims characterized in that the lining material at a Temperature of 50 ° C has a viscosity of 300 mPas up to 30,000 mPas, preferably from 1,000 mPas to 10,000 mPas. Lining according to one of the preceding claims characterized in that the lining is a carrier includes, which is connected to the lining material and a Scaffolding for the lining material at least forms in a non-solid state of the lining material. Lining according to one of the preceding claims characterized in that the carrier with the lining material at least partially coated and / or impregnated is. Lining according to one of the preceding claims characterized in that the carrier is a porous Material includes, so that in the carrier existing cavities at least partially fillable with the lining material are. Lining according to one of the preceding claims characterized in that the carrier is a textile material includes. Lining according to one of the preceding claims characterized in that the carrier is a nonwoven fabric includes. Lining according to one of the preceding claims characterized in that the carrier, in particular the Nonwoven fabric adapted to the shape of a pipe, both in the direction of the tube axis as well as transversely to deformed. Lining according to one of the preceding claims characterized in that the carrier, in particular the Nonwoven fabric, at least approximately plastically deformable. Lining according to one of the preceding claims characterized in that the nonwoven fabric, in particular by Needles, water jets and / or sewing, mechanically and / or thermally solidified. Lining according to one of the preceding claims characterized in that the carrier one or more layers is constructed, and individual layers have different properties have. Lining according to one of the preceding claims characterized in that the nonwoven fabric for improving the Absorbency additionally occupied by a batt is. Lining according to one of the preceding claims characterized in that the lining comprises at least one film having. Lining according to one of the preceding claims, characterized in that the at least one film on the outside of the Ausklei tion and / or on the inside of the liner is arranged. Lining according to one of the preceding claims characterized in that the lining, preferably the carrier and / or the lining material, and the film connectable to each other are. Lining according to one of the preceding claims characterized in that the film is permeable to water molecules is. Lining according to one of the preceding claims characterized in that the film consists essentially of the same Ingredients how the lining material is constructed and itself especially involved in the reaction of networking. Lining according to one of the preceding claims characterized in that the lining material as a component comprises a UV-sensitive crosslinker. Lining according to one of the preceding claims characterized in that the lining is a water-dispensing Component in the lining material and / or in the carrier. A lining for a pipe wall, comprising Lining material which is a prepolymer having at least one isocyanate end group includes and a solidification temperature of less than or equal to 20 ° C, preferably by at least one partial crystallization and / or by at least partial glazing. Method of lining the inner wall of a pipe, comprising the following method steps: - Provide a lining which at ambient temperature substantially is dimensionally stable, - Insert the lining in the Pipe, so that the inside of the pipe wall at least in sections is lined and - curing of the lining to its final strength by a crosslinking reaction. Method according to the preceding claim, characterized a pressure is applied in the tube so that the liner at least in sections, to rest on the inner wall of the pipe comes. Method according to one of the preceding claims characterized by heating the liner prior to insertion into the tube so that the lining is deformable. Method according to one of the preceding claims characterized in that the lining is at a temperature is cooled, in which the lining material dimensionally stable is. Method according to one of the preceding claims characterized in that the lining at least with a Carrier is provided. Method according to one of the preceding claims characterized in that the lining with a reactive 1k system lining material is provided. Method according to one of the preceding claims characterized in that the lining comprises a prepolymer is provided with at least one isocyanate end group. Method according to one of the preceding claims characterized in that the lining with a polyurethane Prepolmer comprehensive lining material is provided. Method according to one of the preceding claims characterized in that the lining is in front of a complete Crosslinking of the lining, in particular of the lining material, by Heating becomes deformable again, so that when introducing the lining resulting defects are correctable. Method according to one of the preceding claims characterized in that the lining is provided with a foil which is preferably firmly connected to the carrier is. Method according to one of the preceding claims characterized in that the film with at least one method selected from the group of laminating, extruding, Spraying and reactive process on the support is applied. Method according to one of the preceding claims characterized in that the lining after its manufacture and stored in an atmosphere prior to installation in the tube which delays the crosslinking reaction at least. Method according to one of the preceding claims characterized in that after the insertion of the liner a preferably hot steam is passed into the pipe, so that the networking, at least on the surface of the Lining, is accelerating. Method according to one of the preceding claims, characterized in that after the introduction of the lining, a UV lamp the tube is agitated to accelerate the cross-linking, at least at the surface, of the liner containing a supplemental UV-sensitive crosslinker. Method for producing a lining for a pipe wall comprising the following process steps: - Provide one is a prepolymer having at least one isocyanate end group, in particular polyurethane prepolymer, comprising lining material, which is dimensionally stable at ambient temperature, and a carrier, which is a framework for the lining material at least in a non-solid state of the lining material forms and preferably comprises a nonwoven fabric, - melting the lining material, - Merge the lining material and the carrier so that the lining material at least partially connected to the carrier, - Cooling down the lining, leaving the composite of carrier and lining material is dimensionally stable and - store the lining in an atmosphere which is a crosslinking reaction, in particular to achieve final strength, at least delayed. Lining can be produced, in particular produced, according to a method according to any one of the preceding claims Pipe, which at least partially on his Inside and / or outside a lining after one of the preceding claims and / or auskleidbar is, preferably lined, by a method according to a of the preceding claims.