EP1169404A1 - Verfahren zur abdichtung von rohrleitungen und reparaturkit - Google Patents
Verfahren zur abdichtung von rohrleitungen und reparaturkitInfo
- Publication number
- EP1169404A1 EP1169404A1 EP00918804A EP00918804A EP1169404A1 EP 1169404 A1 EP1169404 A1 EP 1169404A1 EP 00918804 A EP00918804 A EP 00918804A EP 00918804 A EP00918804 A EP 00918804A EP 1169404 A1 EP1169404 A1 EP 1169404A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- adhesive
- fabric
- nonwoven
- hollow body
- sealed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/12—Materials for stopping leaks, e.g. in radiators, in tanks
Definitions
- the invention relates to a method for reinforcing or sealing hollow body walls, in which a hollow body in the area to be reinforced or sealed is at least partially enclosed with at least one fabric or nonwoven fabric that is permeable to a curable external adhesive, and the fabric or nonwoven fabric is then impregnated with an adhesive . Furthermore, the invention relates to a repair kit for use in the reinforcement or sealing of hollow body walls, comprising at least one fabric permeable to a curable adhesive or such a nonwoven fabric with which a hollow body can be at least partially enclosed, and at least one curable adhesive for which the fabric or the nonwoven is permeable.
- Hollow bodies that can be filled or filled in the walls are frequently damaged in the course of the operating time due to external influences (for example weather, temperature fluctuations or chemicals). Such damaged areas generally result in at least a reduction in the operational safety of the hollow body concerned.
- the damaged areas are continuous openings over the entire cross-section of a hollow body wall, filling material usually emerges from the hollow body immediately or in the case of filling. This effect occurs particularly drastically with hollow bodies under pressure, for example pressure boilers, gas or
- WO 94/05945 relates to a method for reinforcing corroded pipes, in particular pipelines, or containers, which allows reinforcing, for example, corroded pipeline sections during operation.
- the document describes a method for repairing pressure points that extend in the direction of the pipe or container center.
- a filling material is first entered into the printing point so that the filling material completely fills the printing point.
- a tape with high tensile strength is then wrapped around the filled point, it being possible for an adhesive to be applied to the outside of the previous winding between each winding.
- the high tensile strength tape used consists of high tensile strength fibers which are embedded in a binder matrix. The document does not show that the tape used is permeable to the adhesive used.
- US-A 4,756,337 relates to a kit for use in sealing low pressure gas pipes and a corresponding method.
- a pressure-sensitive, adhesive-impermeable tape is first wound around the area to be sealed and then wrapped with a fabric soaked in adhesive.
- US-A 4,681,986 relates to a kit for use in isolating exposed cable junctions and a corresponding method.
- the exposed connection point is first wrapped with an amorphous insulation material and then enclosed with a tissue soaked in adhesive.
- a disadvantage of the latter methods known from the prior art is that they require several separate work steps using different sealing materials. In particular, handling is made more difficult by the fact that the sealing process must be successfully completed when the first layer of sealant is applied, since additional layers of fabric contribute little or nothing to the sealing success.
- the objects are achieved by a method in which a hollow body in the area to be reinforced or sealed is at least partially enclosed with at least one fabric or such a nonwoven fabric that is permeable to a curable external adhesive and the fabric or the nonwoven fabric is subsequently impregnated with an adhesive, and also by means of a repair kit which contains at least one fabric or such a nonwoven fabric which is permeable to a curable adhesive and at least one curable adhesive for which the fabric or the nonwoven fabric is permeable.
- the invention thus relates to a method for reinforcing or sealing hollow body walls, in which a hollow body in the area to be reinforced or sealed is at least partially enclosed in the area to be reinforced or sealed with at least one fabric or such nonwoven material that is permeable to a curable external adhesive, and then the fabric or nonwoven fabric is also enclosed is soaked in an adhesive.
- hollow body refers, for example, to containers for holding, storing or treating liquids, gases or flowable solids and to pipelines for the transport of liquids, gases or flowable solids, the aforementioned Containers or pipes may be suitable for pressureless operation or for use under pressure.
- the hollow bodies can have any cross section, for example circular, oval or angular.
- the term refers "Hollow body” on the pipes and containers mentioned with at least approximately oval or circular cross-section.
- an "area to be reinforced or sealed” is understood to mean an area in the wall of the hollow body which is so defective that safe operation of the hollow body can no longer be guaranteed or is impossible.
- areas to be reinforced or sealed are cracks, corrosion spots, dents, dents, faulty seals or solder joints and the like.
- the aforementioned defective areas can extend over larger areas of the wall or affect only a small part of the wall.
- a damaged point can extend, for example, in the longitudinal axis of the hollow body, provided that the hollow body has a defined longitudinal axis, or can affect the hollow body circumferentially.
- the method according to the invention is applied to hollow bodies which have a diameter of not more than about 100 cm, for example about 50 cm or about 40 cm. In a further preferred embodiment of the invention, the method is applied to hollow bodies whose diameter is approximately 0.1 to approximately 30 cm, in particular approximately 0.5 to approximately 15 cm.
- the expected operating pressure should generally not exceed about 30 bar.
- a lower upper limit may be appropriate. Damaged areas of greater extent, such as extensive corrosion or extensive cracks, the more than about a third of the circumference of the hollow body may require lower expected upper pressure limits.
- the operating pressure to be expected in such cases should be less than approximately 20 bar, in particular approximately 16 bar or less.
- the method according to the invention is fundamentally suitable for hollow bodies made from a wide variety of materials, it not being necessary for the hollow body to consist of only one material.
- the method according to the invention is particularly suitable, for example, for hollow bodies made of plastics, metal, concrete, porcelain (earthenware), ceramic or composite materials which comprise the materials mentioned and, if appropriate, further substances.
- Materials for which the process according to the invention is particularly suitable are, for example, polyvinyl chloride (PVC-U and -C), poly (acrylonitrile-butadiene-styrene) (ABS), copper, brass, steel, cast iron, lead, zinc, concrete, porcelain (Earthenware), AZ pipes or ceramics, or mixtures or composites of two or more of the materials mentioned.
- the damaged area is first at least partially enclosed with at least a tissue or such a nonwoven fabric that is permeable to a curable outer adhesive, and the fabric or nonwoven fabric is then impregnated with the outer adhesive.
- an “external adhesive” is understood to mean an adhesive which is applied from the outside after the fabric or the nonwoven has been applied.
- curable means in the context of the present text that the adhesive either under ambient conditions, as in the Use of the method according to the invention usually prevails, cures automatically, or cures only as a result of an action to be carried out by the user (for example heating, moistening, irradiating or the like). Temperatures from approximately 5 ° C. to approximately 50 ° C. and atmospheric humidity values from approximately 10 to approximately 100% are considered to be the usual conditions when carrying out the process according to the invention.
- External adhesives which are suitable within the scope of the method according to the invention are those adhesives which both have good adhesion to the surface of the hollow body and also ensure an adhesive bond with the fabric or nonwoven used.
- suitable adhesives have a pot life which, on the one hand, enables problem-free application to and penetration of the fabric or the nonwoven fabric, but on the other hand enables the quickest possible usability of such a reinforced or sealed area.
- Suitable adhesives have a pot life of less than about 15 minutes, in particular less than about 5 minutes, at about 20 ° C. Particularly suitable pot lives are about 0.5 to about 4 minutes, for example about 1 to about 3 minutes.
- an external adhesive can be used, which ensures compliance with the pot life mentioned under the corresponding conditions. If the pot life depends on the air humidity, as can be the case, for example, with polyurethane systems, the values given here apply, for example, at about 20 to about 23 ° C. and about 50 to about 65% relative air humidity.
- Suitable adhesives can be used both as one-component systems (1K) and in the form of two-component systems (2K). In the context of a preferred embodiment of the invention, a two-component adhesive is used.
- Suitable types of adhesive are curable adhesives based on polyurethane, polyester, epoxy resin or (meth) acrylate or a mixture of two or more such adhesives.
- external adhesives which are suitable in the context of the present invention have no pressure-sensitive adhesive properties after curing, in particular after the pot life has ended.
- Suitable adhesives are those which can be prepared in the usual way from polyols and isocyanates. Particularly suitable are, for example, polyurethane adhesives which have prepolymers carrying NCO groups, as can be obtained by reacting suitable polyols with corresponding polyfunctional isocyanates.
- the polyols commonly used in the field of polyurethane adhesives can be used as polyols for producing such prepolymers.
- these are polyester polyols or polyether polyols or mixtures thereof.
- Suitable polyester polyols generally have a molecular weight (M n ) of approximately 200 to approximately 50,000 and are generally obtained by reacting linear diols with dicarboxylic acids.
- Suitable linear diols are, for example, the alkanediols such as ethylene glycol, propylene glycol, butylene glycol, pentylene glycol, hexanediol or their higher homologs and isomers, and mixtures of two or more of the compounds mentioned.
- Suitable dicarboxylic acids are the alkanedicarboxylic acids with 2 to about 40 C atoms, their higher homologues and isomers, and mixtures of two or more thereof.
- the aromatic dicarboxylic acids for example the isomeric terephthalic acids, are also suitable.
- corresponding polyols For the production of corresponding polyols the compounds mentioned are reacted with one another in such a way that molecules are formed which carry an average of more than one OH group, in particular about 1.5 to about 2.5. The polyols are then reacted with polyisocyanates, so that polyurethane prepolymers with at least one free isocyanate group result.
- Corresponding polyurethane systems can be formulated as 1K or 2K systems, with 2K systems usually having a high molecular weight polyol component and a component carrying isocyanate groups.
- a polyurethane prepolymer based on MDI (4,4 '- diphenylmethane diisocyanate) is used as 1 K system and a polyether or polyester polyol, or a mixture of two or more of said polyols used.
- a first component containing a polyether or polyester polyol or a mixture of two or more of the polyols mentioned and a second component containing an at least difunctional isocyanate are used as the two-component system.
- polyurethane adhesives suitable for the purposes of the present invention are, for example, Sista D 325 (1-component system) and Makroplast UK (2-component system) (both: Henkel, Düsseldorf).
- a special 2-component PU system consisting of a special polyol component and a special isocyanate component leads to excellent results.
- the isocyanate component based on a mixture of MDI and a polyisocyanate based on HDI should have an NCO value between 20.0 and 28.0, better between 21.0 and 26.0 and in a specially selected formulation between 22.5 and 24.5 wt .-% and preferably be unfilled.
- the polyol component is at least from a mixture of a branched polyalcohol with ether and ester groups and a polyetheraminopolyol.
- the OH number of the unfilled polyol mixture should be between 315 and 450, better between 340 and 410 and preferably between 355 and 390.
- the polyol component preferably also remains unfilled. Catalysis is not absolutely necessary; however, a small amount of catalyst is advantageous.
- the volume mixing ratio between the polyol component and isocyanate component can vary within a wide range. For better handling, a volume mixing ratio of 1: 1 should be aimed for.
- the crosslinking of both components should be approximately stoichiometric, with an NCO / OH ratio between 1, 20: 1, 00 to 0.80: 1, 00, better between 1, 10: 1, 00 to 0.90: 1, 00, but should preferably be set between 1.05: 1.00 to 1.00: 0.95.
- the polyol component contains (in% by weight)
- the polyisocyanate component contains (in% by weight)
- the coating should also have a consistency in the mixed state, which on the one hand allows amounts of 50 to 75 g, depending on the tube diameter, to be absorbed per defect and on the other hand soaks the bandage well without the coating flowing away from the application site.
- the viscosity in the mixed state measured according to Brookfield at 23 ° C, should therefore be around 5,000 mPas.
- the quick hardening of the system is achieved through the special selection of the components and through a high quantity coating. A heat build-up forms, which allows the coating to harden quickly.
- This 2K system based on polyurethane for the temporary repair of pressure and unpressurized pipelines is characterized above all by the fact that with a long processing time of at least 5 minutes, the coating cures, preferably in conjunction with the described method, after just one step Hour at 23 ° C is so high that a pipeline system repaired with it can withstand an operating pressure of 16 bar for at least 1,000 hours. If there is no pressure loss due to leakage, the test is passed.
- the system is so flexible that changes in length on the pipes remain unaffected by the coating.
- the hardness of the cured coating therefore does not exceed the dimensionless value of 77, measured according to Shore D at 23 ° C.
- the coating has high heat and boiling water resistance.
- test standards from the wood industry have been used, since the test specimens bonded from beech wood swell and shrink considerably. Due to the high load on repaired pipelines, it therefore makes sense if the coating, used as an adhesive, achieves a value of> 6.0 N / mm 2 , measured according to the adhesive standard DIN EN 204, stress group D4.
- the heat resistance measured according to WATT 91, has values of> 9.0 N / mm 2 (measured at 80 ° C). The heat resistance is This is important because pressurized water systems are operated at temperatures of 60 ° C and pressureless systems have to withstand even higher temperatures of up to 90 ° C.
- the coating on the commercially available piping has sufficient adhesive properties.
- Different pipe materials are used in industry and household. As a rule, these are made of bondable plastics or metals such as PVC-U, PVC-C, ABS, galvanized or chromed metals, brass, VA steel or copper. In rare cases, lead pipes are also used. Pipelines made of the above-mentioned materials must therefore be tested in order to be as practical as possible. In order to simulate leaks such as stress cracks, holes or the like, a test was prepared. If leakage occurs in the area of the molded parts, such as on the fitting, T-piece or socket, which is very often the case, the usual repair systems, such as the fitting of clamps, are unusable.
- the coating system can be used universally on a wide variety of materials, since polyurethanes bring good to very good adhesion properties when the raw material components are carefully selected.
- the coating based on the 2-component PU system has compared to many other systems, e.g. based on polyester, polystyrene or PMMA further advantages in terms of odor emission.
- polyester adhesives are the adhesives conventionally produced from polyols and polycarboxylic acids.
- polyester adhesives are used which are based on butanediol-1, 4 or pentaerythritol, or a mixture thereof, and adipic acid or phthalic acid, isophthalic acid or terephthalic acid, or a mixture of two or more thereof.
- Suitable epoxy resin adhesives are the adhesives which can be prepared in the usual way from polyols and epoxides. Epoxy resin adhesives which have bisphenol-A as the epoxy component and are cured with amines or polymercaptans are particularly suitable. Corresponding systems are known to the person skilled in the art. Suitable adhesives are available, for example, under the name Metallon E (from Henkel, Düsseldorf).
- Suitable (meth) acrylate adhesives are the adhesives which can be prepared in the customary manner using acrylic acid and its esters or from methacrylic acid and its esters.
- the adhesives have at least one compound that can be subjected to a radical polymerization reaction.
- Particularly suitable in this regard are adhesives made from alkyl acrylates, cycloalkyl acrylates, alkyl methacrylates, cycloalkyl methacrylates, alkoxy acrylates, alkoxymethacrylates, alkylene diacrylates or alkylene dimethacrylates.
- Suitable monomers are, for example, methyl methacrylate, lauryl methacrylate, 2-
- the monomers used are methyl methacrylate, tetrahydrofurfuryl methacrylate, cyclohexyl methacrylate, isobornyl methacrylate, hydroxyethyl methacrylate or hydroxypropyl methacrylate or mixtures of two or more thereof.
- the proportion of said monomers in the adhesive to be used according to the invention is generally about 1 to about 90% by weight, for example about 10 to about 80% by weight or about 15 to about 60% by weight.
- two-component methacrylate adhesives or polyurethane adhesives are used.
- the adhesives mentioned are generally used individually, but if appropriate a mixture of two or more of the adhesives or types of adhesives mentioned can also be used.
- the viscosity of the outer adhesive should not exceed a value of approximately 10,000 mPas (Brookfield, RVT, 23 ° C, spindle 4).
- the outer adhesive has a viscosity of about 500 to about 7,000, in particular about 1,500 to about 5,000 mPas (Brookfield, RVT, 23 ° C., spindle 4).
- an inner adhesive can be applied to the area to be reinforced or sealed before the area to be reinforced or sealed by the fabric or the nonwoven fabric.
- the inner adhesive may be necessary, for example, if particularly good adhesion of the fabric or the nonwoven fabric to the surface of the hollow body is desired, or if the fabric or nonwoven fabric is to be fixed first on the surface of the hollow body, for example to prevent the fabric from slipping or to prevent the nonwoven.
- the application of an internal adhesive can even improve the sealing success, ie the life of the seal can be extended if necessary, or there is an improved tolerance of the sealed damaged area for increased pressure load.
- the adhesives already mentioned above are suitable as the internal adhesive. However, it is also possible to use an adhesive that has permanent adhesive properties as the internal adhesive.
- the inner adhesive can, for example, also have a higher viscosity than the outer adhesive.
- a suitable upper limit for the viscosity of the outer adhesive is, for example, about 20,000 mPas. In a preferred embodiment of the invention, however, identical adhesives, i.e. curing adhesives, are used as the inner and outer adhesive.
- nonwovens that have sufficient permeability for a curable external adhesive are equally suitable as nonwovens.
- fabric also includes structures which represent a mixed form of fabric and nonwoven, for example composites which have at least one fabric layer and at least one nonwoven layer or other mixed forms in which, for example, fabric surfaces and nonwoven surfaces alternate.
- permeability refers to the ability of the fabric or nonwoven fabric to allow adhesive to pass through the fabric mesh or the spaces in the nonwoven fabric, so that the adhesive is completely penetrated into the fabric or nonwoven fabric.
- the permeability of a fabric or a nonwoven depends on the fabric or the nonwoven itself and on the adhesive used, in particular on the viscosity of the adhesive. In general, there is sufficient permeability in the sense of the invention if the adhesive penetrates at least one fabric layer or nonwoven fabric layer during its pot life, ie before it has fully hardened.
- fabric includes fabrics which are made from natural fibers, synthetic fibers, metal fibers or glass fibers or mixtures of two or more of the fibers mentioned (mixed fabrics). Suitable materials are, for example, cotton, linen, sisal, hemp, flax, polyethylene, polytetrafluoroethylene, polyester, polyurethane, steel or glass fibers. Suitable blended fabrics have, for example, a combination of natural fibers and plastic fibers, in particular cotton fibers and polyester fibers. The proportion of natural fibers can be approximately 1 to approximately 99% by weight, the proportion of plastic fibers approximately 99 to approximately 1% by weight.
- nonwoven fabric 1 includes nonwovens made of synthetic and natural fibers, which can be obtained by general methods of manufacture known to the person skilled in the art, for example random nonwovens or spunlaced nonwovens.
- a fabric which consists of polyester threads.
- a fabric which consists of approximately 40 to approximately 80% by weight of cotton threads and approximately 20 to approximately 60% by weight of polyester threads.
- fabrics which have one or more of the following properties:
- the fabrics or nonwovens which can be used in the context of the present invention can have a wide variety of dimensions, depending on the intended use, for example square, circular or oval. In a preferred embodiment of the invention, however, band-shaped fabrics or nonwovens are used, the length of which exceeds the width many times over. Particularly suitable are woven or nonwoven tapes which have a width of approximately 5 to 500 mm and a length of approximately 10 to 500 cm. In a preferred embodiment, woven or nonwoven tapes are used which have a width of about 40 to about 80 mm and a length of about 200 to about 300 cm.
- the fabrics or nonwovens can optionally be mechanically or chemically pretreated, i.e. the fabric or nonwoven surface can, for example, be roughened or treated with adhesion promoters.
- the fabrics or nonwovens can optionally be heat-set or dyed in one or more colors. If necessary, the fabric or the nonwoven fabric can already be equipped with a pressure sensitive adhesive, but it should be ensured that the fabric or the nonwoven fabric can still be penetrated by the external adhesive in order to achieve an optimal sealing effect.
- the damaged spot to be sealed or reinforced is first cleaned of adhering, coarse soiling in a first cleaning step and the surface is roughened.
- This first cleaning step is necessary when the area to be reinforced or sealed or the area to be covered with fabric or nonwoven has coarse dirt or is particularly smooth or both.
- the first cleaning step can be carried out using a wide variety of means which are generally known.
- a suitable means for carrying out the first cleaning step is, for example, a wire brush, which both removes coarse dirt and ensures that the surface is roughened at the damaged area.
- a further roughening can optionally be carried out using abrasives.
- not only the immediate vicinity of the damaged area is roughened, but also surface parts going beyond it, preferably the entire circumference, which is to be wrapped with fabric or fleece.
- the area around the damaged area preferably the entire area to be enclosed by the fabric or fleece, can then be chemically cleaned, in particular degreased and, if appropriate, freed from further organic residues, provided such contaminants are present.
- all common solvents are suitable for this.
- a cleaning agent containing aliphatic alcohol or a mixture of two or more aliphatic alcohols for example ethanol, propanol or isopropanol, is used for cleaning.
- the chemical cleaning step is always carried out.
- the first adhesive can be applied if necessary.
- the application is preferably made to the full extent of the fabric or nonwoven.
- the area to be sealed or reinforced is at least partially enclosed with at least one fabric or nonwoven fabric that is permeable to a curable external adhesive.
- the hollow body to be reinforced or sealed is a hollow body designed for unpressurized operation (for example a drain pipe), then it may be sufficient to cover only the damaged area with one or more layers of fabric or nonwoven fabric.
- the hollow body is comprehensively enclosed with the fabric or nonwoven in the area of the point to be reinforced or sealed.
- the point to be reinforced or sealed is enclosed in a spiral shape with a plurality of fabric or nonwoven layers.
- the number of layers of fabric or nonwoven depends on the type and Scope of the position to be strengthened or sealed. If the extent of the damaged area exceeds the width of the fabric or nonwoven fabric, several fabric or nonwoven fabric layers can be wrapped side by side, so that individual fabric or nonwoven fabric layers show partial overlap.
- At least about two fabric or nonwoven layers are applied.
- the outer adhesive can already be applied to each individual fabric or nonwoven layer or to several fabric or nonwoven layers during the application of the fabric or nonwoven. In this way, particularly with adhesives with a short pot life and when using dense fabrics with a small mesh size or dense nonwovens, particularly good penetration of the fabric or nonwoven with adhesive can be achieved. However, it is also possible to apply the adhesive only after the hollow body has been completely enclosed, so that the fabric or the nonwoven is impregnated with the adhesive from the outside.
- the outer adhesive is already applied during the application of the fabric or nonwoven.
- suitable measures for curing the adhesive can be taken, if this is necessary depending on the type of adhesive to be hit.
- suitable measures can be, for example, moistening, irradiating or heating the soaked in adhesive Fabric or nonwoven, for example with a hot air blower. In the latter case, however, it should be ensured that the maximum permissible temperature with which adhesive and fabric or nonwoven can be loaded is not exceeded. Generally, the temperature should not exceed about 60 to about 80 ° C.
- Metallic pipelines must first be cleaned and roughened from coarse contaminants such as hemp, sealing pastes, sealing tapes, rust, paint, etc. with a steel brush or emery cloth on both sides at a distance of 1.5 times the bandwidth. This area is then degreased with Tangit KS cleaning cloths from Henkel.
- the cartridge gun is opened, the double cartridge is inserted and the gun is locked again.
- the cap on the tip of the cartridge is then removed and the static mixer is attached.
- the cartridge gun is now ready for use.
- Trigger lever pressed into the static mixer, mixed and in one
- the adhesive should be applied a little wider than the tape in order to ensure that the tape connects to the substrate even in the edge area of the tape.
- the repaired system can be put back into operation after only 15 minutes, at a pressure load of up to 6 bar after 30 minutes and at a pressure load of up to 16 bar after 60 minutes at 23 + 2 ° C.
- an adhesive which is self-curing, ie which cures without any further external influence is used as the external adhesive.
- the present invention accordingly also relates to a repair kit for use in the reinforcement or sealing of hollow body walls, comprising at least one fabric permeable to a curable adhesive or such a nonwoven fabric with which a hollow body can be at least partially enclosed, and at least one curable adhesive for which the fabric or the nonwoven fabric is permeable to.
- the fabric or the nonwoven and the adhesive mentioned correspond to the fabrics, nonwovens and adhesives as have already been described above in the context of the present text.
- the repair kit contains at least one curable adhesive, which is used, for example, as an outer or inner adhesive or, if both adhesives are identical, as the only adhesive, in at least one cartridge.
- the cartridge is designed in the usual way and usually has a nozzle for attaching an extrusion nozzle. If the adhesive is a 2-component adhesive, then a 2-chamber double cartridge is used as the cartridge.
- the repair kit according to the invention also contains at least one of the following components:
- Cartridge holder with extrusion device for example a cartridge gun
- the kit according to the invention optionally has one or more extrusion dies.
- the adhesive to be used is a two-component adhesive
- an extrusion nozzle is advantageously used which has a static mixer connected to the extrusion nozzle in order to mix the adhesive components.
- the use of a static mixer is particularly recommended, particularly because of the simple and uniform mixing and thus also the penetration of the textile tape.
- a cartridge is used to store the adhesive which is under pressure in order to enable the ingredients to be extruded automatically.
- This can be made possible, for example, by a cylinder filled with pressurized gas, which, after operating a corresponding trigger device, sets an extrusion piston in motion in the cartridge.
- the line pressure is turned off.
- the area to be sealed is then cleaned thoroughly at a distance of 1.5 times the bandwidth to the left and right of the leak.
- intensive cleaning with the included cleaning agent is sufficient.
- Metal lines must be cleaned with a steel brush to remove coarse dirt (hemp, paste, rust, paint, etc.) and roughened (sanded). After that, if necessary, a fine cleaning is carried out with the enclosed cleaning agent.
- the double cartridge with the 2-component adhesive is then inserted into the gun and locked. Any existing cartridge protection cap is removed from the cartridge and an extrusion nozzle with a static mixer is screwed on.
- the adhesive is first applied to the pipe, spread evenly over the circumference of the pipe with at least the bandwidth using the brush supplied.
- the tape is placed directly on the fitting and the pipe is wrapped.
- glue is applied again after each winding layer and spread with the enclosed brush. For example, approximately 6 layers of tape should be applied in this step.
- the adhesive is then applied to the leaky fitting and the tape is wound over the fitting (at least one band).
- the tape should also be soaked here (method of operation as already described), the number of layers can also here for example 6.
- the rest of the tape is wrapped again on the tube and soaked in adhesive. Thereafter, the tape can, if necessary, for example using the enclosed glove, be adapted to the shape of the part to be sealed by manual molding, for example by turning it in the tape direction.
- the pot life of the adhesive based on polyacrylates is, for example, about 2 to about 3 minutes at 20 to 25 ° C. With a pressure load of up to about 6 bar, a minimum hardening time of about half an hour at over 6 bar of about one hour must be observed (measurement analogous to DIN 16970 on PVC-U pipes). When using a PU adhesive, it takes approx. 1 hour to cure until a pressure load of 16 bar is reached.
- Sovermol 1080 a branched polyalcohol with ether and ester groups from Henkel KGaA,
- Voranol RA 800 a highly reactive, amine-based polyether polyol from Dow Chemical
- Perenol E8 a solvent mixture with silicone from Henkel KGaA
- Desmodur DA a polyisocyanate based on hexamethylene diisocyanate from Bayer.
- the individual components are placed in an evacuable laboratory dissolver at room temperature and heated to 70 ° C. with stirring at a stirring speed of 350 rpm. A vacuum of 15 mbar is then applied for 1 hour at the same stirring speed and temperature. The mixture is complete as soon as the water content, measured according to Karl Fischer, is below 0.05%.
- Polyester tape usual qualities available in specialist shops,
- Both the polyol component and the isocyanate component are stored over a period of 3 months at an elevated temperature of 40 ° C.
- the coating is considered to be stable in storage if the initial viscosity of the mixed adhesive system increases by less than twice.
- the maximum processing time at 23 ° C and a relative humidity of 50% must be determined. The time is considered to be exceeded when the coating can no longer be spread with the brush.
- Test plate material PVC-U
- the fabric tape to be tested is cut to a length of 400 mm. At the two ends of the cut, the tension weights are fastened with a clamp so that the fabric tape after insertion into the
- Adhesive board hangs freely at least 20 mm on the side.
- the squeegee is applied to the test plate over the entire length of the plate
- Adhesive board inserted and the plate placed horizontally (without bending) on two support beams so that the tension weights hang freely.
- the fabric tape must protrude at least 10 mm on both sides of the extended adhesive film.
- the residence time of the fabric tape in the adhesive is max. 1 minutes at
- the impregnation ideally corresponds to the film width (without a
- the duration of the test is to be determined.
- the degree of impregnation in area percent must be determined. It must also be determined to what extent the edge areas (blurring of the edges) correspond to the applied adhesive film.
- the result of the absorption capacity is essentially determined by the fabric base (cotton, polyester, glass fiber fabric, etc.), the fabric structure (warp, weft, etc.) and the viscosity or structure of the adhesive.
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Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19912435 | 1999-03-19 | ||
DE19912435 | 1999-03-19 | ||
PCT/EP2000/002346 WO2000056831A1 (de) | 1999-03-19 | 2000-03-15 | Verfahren zur abdichtung von rohrleitungen und reparaturkit |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1169404A1 true EP1169404A1 (de) | 2002-01-09 |
Family
ID=7901664
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00918804A Withdrawn EP1169404A1 (de) | 1999-03-19 | 2000-03-15 | Verfahren zur abdichtung von rohrleitungen und reparaturkit |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1169404A1 (de) |
DE (1) | DE10012443A1 (de) |
WO (1) | WO2000056831A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010029517B4 (de) * | 2010-05-31 | 2012-08-23 | Ludwig Schwerdtel Gmbh | Kartuschen-Anordnung |
DE102011010371A1 (de) * | 2011-02-04 | 2012-08-09 | Ecco Gleittechnik Gmbh | Verbundwerkstoff auf Basis eines naturfaserverstärkten Kunststoffes |
MX2020005608A (es) * | 2017-12-27 | 2020-09-25 | Dow Global Technologies Llc | Composiciones adhesivas sin solvente de dos componentes para la adhesion a sustratos de metal y/o metalizados. |
MX2020005752A (es) * | 2017-12-27 | 2020-08-20 | Dow Global Technologies Llc | Composiciones adhesivas sin solvente de dos componentes para adhesion a sustratos aislantes polimericos. |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1546073A (en) * | 1976-05-10 | 1979-05-16 | Ready Seal Ltd | Method of repairing leaks in pipes and pipelines carrying fluent medium under pressure and means for use in the method |
GB2164071B (en) * | 1984-09-05 | 1987-07-29 | Tba Industrial Products Ltd | Heat settable fibrous sealant material |
US4681986A (en) * | 1986-02-24 | 1987-07-21 | Royston Laboratories, Inc. | Splice construction for electrical cable and method for making the same |
US4756337A (en) * | 1986-02-24 | 1988-07-12 | Royston Laboratories, Inc. | Gasline repair kit |
FR2613000B1 (fr) * | 1987-03-23 | 1989-07-28 | Legot Jacques | Bandage de reparation |
ATE189736T1 (de) * | 1992-09-09 | 2000-02-15 | Clock Spring Company L P | Verfahren zur reparatur von rohren |
US5894864A (en) * | 1995-07-26 | 1999-04-20 | Rich; Benjamin P. | Repair or maintenance system for leaking pipes or pipe joints |
US5732743A (en) * | 1996-06-14 | 1998-03-31 | Ls Technology Inc. | Method of sealing pipes |
NL1003943C2 (nl) * | 1996-09-02 | 1998-03-04 | Nooren Frans Bv | Baanvormige bekleding voor het afdichtend bekleden van constructies, toepassingen daarvoor, werkwijze voor het bekleden van constructies, alsmede beklede constructies. |
-
2000
- 2000-03-15 DE DE10012443A patent/DE10012443A1/de not_active Withdrawn
- 2000-03-15 EP EP00918804A patent/EP1169404A1/de not_active Withdrawn
- 2000-03-15 WO PCT/EP2000/002346 patent/WO2000056831A1/de not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO0056831A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE10012443A1 (de) | 2000-12-14 |
WO2000056831A1 (de) | 2000-09-28 |
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