DE1504803A1 - Material and method for protecting pipelines from corrosion - Google Patents

Description

PATENT LAWYERS

DR.-ING. BY KREISLER DR.-iNG. SCHÖNWALD 1504803 DR.-ING. TH.MEYER DR. FUES

COLOGNE 1, DEICHMANNHAUS

Dr. Expl.

Cologne, August 14, 1965 Pu / Kl / Ax

Ray Brazen Corporation, Oakside at Ho rthside, Ke d ν / ο ο d City,

California (V.St.A.).

Material and process for protecting pipelines from

corrosion

The invention according relates to a material and a method 2UDi protection of pipelines and similar objects to corrosion and other damage by applying a Schutzüberzugeso The method of the invention is particularly suitable for the protection of pipe joints u _or the like., But has many other applications "

It has long been known to make metal pipes corrosion-resistant by applying protective coverings. These coatings - are particularly advantageous when they are applied to underground steel pipes and lines, Z ₀ B ₀ gas lines. »One of the most suitable methods of applying these coatings to metal pipes is to encapsulate them with a plastic. electrically insulating plastics are used, eg »vinyl polymers, such as [polyvinyl chloride, polyethylene, cellulose ester, ζ, Β _β cellulose acetate or oleulose acetate butyrate, or copolymers such as copolymers of ethylene and alkyl acrylates. It has recently been proposed to provide pipelines with protective coatings by first applying a coating of viscous material to the pipe and, over the viscous material, an outer protective coating by extrusion, for example according to the process

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BATH ORIGINAL

of UoSoA. Patent 3,012,585 "These coatings have several advantages over simple spray-on coatings, namely better adhesion of the outer coating to the pipe and, in some cases, the ability to" self-seal ¹¹ ". This self-sealing ability arises from some pressure exerted on the viscous inner layer by the outer covering as a result of post-extrusion shrinkage and / or the pressure exerted by the soil in which the pipe is laid _e . Provided that eggs interior coating is sufficiently flowable and, sufficient pressure is exerted by the outer coating, so it can be pressed to the inner coating by this pressure into holes made in the outer coat v / ground ₀

In general, the known coatings have been found to be satisfactory for coating pipe sections when it was possible to apply the coating to the pipe by extrusion. . These pipe connections are made naturally during the laying of the cable at the construction site. So far, no feasible method is available, in order to lay the protective coating by extrusion over the pipe connection ₀ in general, the pipe joints with coatings of coiled plate are covered, "This coiled However, existing tape coatings on the pipe connections turned out to be considerably worse than the overmolded coatings on the pipe itself. The high rate of damage to pipes therefore occurs at the pipe connections, where the nickel tape or other coatings corrosion or other damage allow the z to burst pipe lead "Der.Fachwelt it is ^li: ngst aware that an urgent need for a v / ffective method is for the protection of pipe connections, but no satisfactory solution has been proposed to this problem so far. The same problems arise with attempts to put protective coatings in place on pipes

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apply or repair.

The subject of the invention is a material for the production of protective protective coatings, which consists of a part which has the property of thermal springback, a flowable, viscous material which is applied to the surface of this part, and a coating which prevents sticking at least part of the surface which is not in contact with the thermally resilient part is applied and is of such a nature that it forms a single phase with the flowable material at the resilience temperature Λ

The spring-back due by heat part advantageously has the property of elastic memory and is preferably made from a cross-linked polymer, which may have been crosslinked by irradiation, Z ₀ B ₀ ultraviolet radiation or by chemical Vfege. Suitable examples are polyolefins, preferably polyethylene, or copolymers of ethylene with alkyl acrylates _e The Slee springback due part by V / may have been tubularly preformed and such that it expands when the spring-back or contracted "The inside or outside or both know all or partially covered with the flowable, viscous material "the material can have the shape like a band that is wrapped around a body to be protected _o Preferably, the exposed surface of the flowable viscous material is completely protect the adhesive layer preventing coating with the.

The flowable viscous material has advantageous in that it remains at room temperature ⁴ · such a high viscosity when applied to the surface of the spring-back due part of the normal force of gravity with this contact. The material must flow at room temperature when subjected to a force equal to the compressive force exerted by the thermally resilient member after resilience on a body to which the coating is applied

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ORIGlNAL BATHROOM

«A mastic resin type material (hereinafter referred to as" mastic ") is a flowable viscous material Material particularly well suited. As a cover for the bonding Waxes are particularly suitable. The coating preferably remains in the flowable viscous material at the working temperature in solution. "

Substantially non-crystalline materials which have a viscosity of not more than 10 CP at 25 ° ö and which are described in German patent specification ₀ ·. . · <> · (R patent application) the present applicant are described in ", in particular silicone or hydrocarbon grease, which can be made selectively conductive by fine particles of a conductive material, for example, is dispersed ₀ graphite in them.

The invention also relates to a method of coating of bodies, in particular tubular bodies or of Hohrverbindungen, which is characterized in that the material according to the invention is applied to the body or bodies to be coated and the resilience of the for resetting causes capable part, the arrangement is made so that the flow of the flowable in this return viscous material is effected, the here to be coated Body touches.

The material according to the invention for the production of protective covers on pipelines and pipe connections consists of one Part that is not dimensionally stable in the heat, a mastic-like viscous material that is flowable at ordinary temperatures under the pressure exerted by the part that is not dimensionally stable in the heat and at least one Surface of this part which is not dimensionally stable in the heat ”is applied, and a covering the mastic-like material, the sticking-preventing coating in the mastic-like material under the temperature conditions under which the is caused to reset by the heat-resilient part, goes into solution and in the working unit

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BATH ORIGINAL

solution remains. This material can be applied to a pipe joint to be protected • by sliding it along the pipe until it is over the exposed pipe joint. "provided the inventive material is then heated, whereby the resiliency capable change its dimensions so that the mastixartige material is" pressed against the pipe connection _β is preferably pre-heated, the tube immediately prior to application of the material according to the invention, especially if outer coatings on Rohie large diameter of, for example, about 90 om.As already mentioned, under these temperature conditions the coating preventing the sticking forms a single phase with the mastic-like material or dissolves therein without significantly impairing the properties of the mastic-like material, and remains b at work temperature in solution »

The material according to the invention is often tubular, with the mastic-like coating being provided on the inside and the coating preventing sticking covering the mastic material. However, it can also be in the form of a tape that is wrapped around the object to be protected, or any other shape. When used to protect "pipe connections, the length of the material according to the invention is preferably chosen so that it overlaps the protective coating already present on the pipe so that it is with part of the existing protective coating and with the exposed part of the metal of the pipe and the pipe connection is firmly glued .; So if the resilience of the resilient part is brought about, the mastic-like material is pressed against the exposed pipe and part of the already existing protective coating. If the material according to the invention is left to cool after the recovery, a very effective result Protective cover for the pipe connection.

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Beyond that, practice. the resilient part of the invention After its application, the material continues to exert a pressure on the mastic-like material. This pressure results from residual internal stresses caused by the phase change to the crystalline state as a result of the reset process are generated, and by the difference · in the coefficient of thermal expansion between the resilient Part and the pipe, that continued pressure gives the material according to the invention after its application the ability of a very effective self-sealing, since it causes the mastic-like material to get into any punctures or to flow holes made in the protective coating. As already mentioned, the mastic-like material is chosen so that it is at the working temperatures, ZoB. at room temperature and significantly lower temperatures down to 0 C * and below the pressure created by the resilient Part is applied to a pipe or pipe joint after the material according to the invention has been applied, is flowable “It turned out to be useful, mastir-like Use materials that are hixotropic.

The invention is explained in more detail below with reference to one Example described in connection with the images »

FIG _o 1 is a cross section through an inventive material.

Figure "Figure 2 illustrates how the inventive material is guided via a pipe connection in preparation for the application of a Sohutzüberzuges ₀

Fig. 3 illustrates a pipe connection after application a protective cover according to the invention »

Figο4 illustrates a pipe that has a protective coating inside has been provided according to the invention "

The material shown in Figure 1 ₀ is a aua springback enabled by heat portion 11 inside with

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a mastic-like material 12 is covered. A coating is applied to the mastic layer, which bonds the bond; hinders. This coating 13 is an essential part of the invention, since without this coating on the basis of the extremely strong adhesive force of the mastic coating 12 it is almost impossible to push a tubular material, which has a mastic coating on the inside, over a long pipe without the mastic sticks to the outside of the pipe and is removed from the inside of the tubular material and / or the tubular material sticks to the outside of the pipe in a place where this is not desired «, - ±

The main difficulty which stands in the way of trying to provide the mastic-like material 12 with a sticking-preventing coating is that it is to be expected that this coating by its nature worsens the adhesive properties of the mastic-like material at the point in time at which it is applied a pipe connection o «d-adhere. In other words, the anti-stick coating must be effective in preventing the mastic material from sticking to other objects while the coating material is being stored and passed over the pipe joint by sliding it along the pipe. At the same time it must not prevent the adhesion of the mastic with the pipe connection, if the protective coating actually i brought to LiOH _e

One of the essential characteristics of the invention is its use suitable waxes as anti-stick coatings. Certain waxes have been found to have effective anti-stick properties ordinary temperatures and also in the mastic mass go into solution under the temperature conditions under which the springback of the non-dimensionally stable in the Vfärme Materials occurs. There is thus a unique and surprising threefold interaction between that in the Yfärme's non-dimensionally stable material, the mastic-like Material and the 7 / axle cover that prevents adhesion

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of the invention. Materials.

For the purposes of the invention, a material that has the properties of elastic memory is preferably used as the part capable of resilience, as described, for example, in UoSοA ₀ patent specification 3 086 242 ". The" elastic memory "(also called thermal springback ) is known to be the endeavor of deformed thermoplastics to return to their original shape simply by reheating. "Elastic memory can be imparted to polymeric materials as follows: A polymer is first brought into the desired shape by extrusion or in some other way." The polymer is then crosslinked or gives it the properties of a crosslinked material through the action of high-energy radiation, e.g. a high-energy electron beam t initiation of the crosslinking by the action of η ultraviolet radiation or by chemical means, e.g. with the help of peroxides, if polyolefins ¹ are used etched and deformed and then "frozen" in the deformed state by quenching or other suitable cooling · »The same process can also be carried out at room temperature by applying a higher force to deform the polymer. The deformed material will retain its shape almost indefinitely until it increased! Temperature is exposed, which is so high that the spring-back is caused in the case of polyethylene and is about 120 ⁰ O. The polymers that can be processed in this way include polyolefins such as polyethylene and polypropylene, polyamides, polyurethanes, polyvinyl chloride, polyvinylidene fluoride and elastomers such as elastomeric polyurethanes and those described in US Pat. No. 65,953 of 31.10.10.1960 described elastomers. The property of elastic memory can also be imparted to materials which have the properties of crosslinked polymers, for example polytetrafluoroethylene and very high molecular weight polyolefins or vinyl polymers such as polyvinyl chloride

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above "described materials with elastic memory are indeed preferred for the purposes of the invention, however, other materials can be used that call for Ihermorüokfederung has been awarded, Z ₀ as the ent magazine in the US, -Pat 2,027,962 described Materials"

example 1

A protective cover material according to the invention was made by providing an irradiated polyethylene tube having an inside diameter of 39.4 mm with a 0.5 mm thick covering of Maätix (6718-31 1, manufactured by ™ Farboil-Oompany) on the inside . The irradiated polyethylene the property of elastic memory had been awarded so that its inner diameter would decrease with sufficient warming "was His Eüokfederungstemperatur t35 ° E," Using the Mastixschioht an about 13 μ thick coating of wax down the wax film was completely invisible, non-sticky and gave the mastic a uniform sheen. The wax used was Trewax-n'on-slip liquid floor wax, which contained garnaubawaehs in a proportion of $ 70 of the total solids.

As shown in FIG _e illustrates 2 and 3, these protective casing has been | Made of polyethylene 11, Maatixschioht 12 and wax coating 13 via a connection between two bores 14 and 15. As shown in fig.2, there is a clearance between the protective material and the pipe so that the protective cover can be easily brought into place. The tubes 14 and 14 were of commercial quality. They had been provided with the protective covers 16 and 17 by applying polyethylene duroh extrusion to a mastic coating (not shown) previously applied to the pipe. This protected pipe is commercially available as "X-Tru Ooat" pipe available (Herstelle "Republio Steel Corporation) · It is considered the most economical and best protected pipe that currently is available. The Polyäthylensohlauoh 11 was 30 cm

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long, while the exposed surface of the metal tube had an axial length of 10 om ₀

The tube was pre-heated 45 seconds at about 104 ° 0 before the protective coating has been brought into the position shown at 3 ± g> 2 position β to in i * ig arrangement shown _o 2 was then exposed to a temperature van · 135 ⁰ C, whereby the polyethylene hose 11 around the pipes 14 and 15 and around the weld seam shrunk o Under these conditions, the wax 13 in the mastic 12 was completely dissolved. As illustrated in Mg.3, the spring-back polyethylene hose firmly enclosed the existing protective coatings 16 and 17 and the exposed parts 14 and 15 of the pipes, the mastic filling all the spaces between the polyethylene hose 11 and the remaining parts of the pipe connection.

The pipe connection produced in the manner described was then subjected to a Yergleiohstest with a piece of a "X-Tru-Coat" pipe that had no pipe connection and a piece of this pipe, the connection of which was protected with a polyethylene tape covered with mastic, the was wrapped around the connection and sold under the

subject. Designation "X-Tru-Tape" is available / Bin hole of 1mm Diameter and a slot 0.8 mm wide and 50 mm long were made in each specimen so that the bare metal exposed The pipe ends were then sealed with rubber stoppers and dipped in hot wax, creating an electrical insulating coating was formed, whereupon the specimens were immersed in tap water.

After the samples had been in the water for 35 days, they checked. In the case of the protective coating according to the invention no rust was found in the hole, and the mastic had been squeezed out about 6 mm from the looh during the slit completely filled with the mastic compound way and only one there was a small rust spot in the middle and at one end of the slot «, on the" X-Tru-Ooat "pipe with no pipe connection a substantial amount of roat was found in the Looh,

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"was squeezed out no mastic from the" Furthermore, rust was in three quarters of the length of the slot and mastic at one end of the slot. When the tape ^w X-Tru Tape ^M protected pipe connection has been found that the tape was at a The side of the slot had partially loosened, leaving a gap about 8 mm wide ο The tape also began to loosen near the top of the pipe joint The pipe joint protected with the tape was found to have rust in the hole and in the slot strong rust found "

Example 2 .

A piece of polyethylene sole, which had been irradiated up to the application of a dose of 15 megarads and which had been given the property of elastic memory in such a way that its durometer would increase with appropriate heating, was covered with an outer coating of a mastic compound (Johns-Manville Asbestos Fibrous Roof and Foundation Coating). The polyethylene sole had an outer diameter of 51 mm, and the mastic layer had a diameter of 0.5-0.75 now. The mastic layer was provided with an outer coating of wax with a dioke of 13 W, whereby the mastic layer was given a non-adhesive surface. Liquid floor wax with the trade name "Trewax - non-slip" was used lensohlauch was then introduced into a piece of aluminum tube 21 which had an internal diameter of 53 mm "The whole was then heated so that the hose was subjected to a temperature of 302 ⁰ C _t the hose bia extended and the coated with wax Mastixschioht against the inner surface of the aluminum tubes pressed ₀ Under these temperature conditions, the wax was completely dissolved by the mastic "As shown in Fig * 4 shown, the tube 21 has been provided in this manner with an effective Sohutzauskleidung selected from the Maätixschicht 19 containing dissolved Waohs and expanded Polyäthylenschlauoh 20 consisted *

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Example 3

The protective material according to the invention is suitable for protecting pipes and the like _P with a large diameter as well as a small diameter. In this example, a steel pipe with an outside diameter of 91 cm was provided with a protective coating. The protective material used in this case consisted of an irradiated polyethylene tube with an inside diameter of 96.5 cm and a coating of a mastic compound ("6718-311"', manufactured by Fär oil Company). The irradiated polyethylene the property of elastic memory had been awarded so that its would by-P diameter increase with corresponding heating "His thermal resilience temperature was 135 O ₀ About the Mastixsohicht a wax coating a Dioke was laid by about 13 M ο The obtained Y / axially coated mastic layer was non-adhesive. Liquid floor wax with the trade name "Trewax-non-slip" was used,

This protective coating was 15 cm wide and was placed over a piece of bare pipe _o The tube was pre-heated 45 seconds to a temperature of 104 ° 0 before the sohützende cuff was applied. The whole was then exposed to a temperature of 135 ⁰ O, whereby the spring back of the sole tube around the tube was effected. Under these conditions * the wax was completely dissolved by the mastic compound. The spring-backed polyethylene hose tightly enclosed the pipe, with the mastic filling all the spaces between the inside of the polyethylene hose and the outside of the pipe »

A hole 1 mm in diameter and a slot 0.8 mm wide and 50 mm long were then made in the protective cover. Within 24 hours at room temperature, these two openings were closed by the Maetix mass flowing into it.

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The inventive material has except 'the' Torteilen already mentioned other benefits "This includes the ability of Waohsüberzuges 13, the oxidation of the mastic 12 during storage to prevent ₀ It was found that the mastic oxidized when a longer period of exposure to the This in turn has a detrimental effect on the properties, in particular the adhesive properties of the mastic compound from ₀ This deterioration due to oxidation is particularly noticeable when the material is stored at moderately elevated temperatures, as is often the case in industry «, wax coatings, as described in the foregoing examples and g at temperatures | up to about 70 ⁰ O and above are resistant to effectively prevent the deterioration by oxidation.

In the preferred embodiment of the invention in which Materials with elastic memory are used to produce the resilient part 11, result'sich Several other advantages beyond the advantages offered by the general inventive idea. One of these advantages is the high dielectric strength of crosslinked polymer materials with elastic memory. These Dielectric strength is of course of great importance in many applications of the invention, especially in cases in which buried pipes or other buried construct- g These are to be protected as they come into contact with sharp stones or other objects in the ground come with the risk of damaging the protective cover entail. Another advantage arises from the difference in the coefficient of thermal expansion between the Material with elastic memory and the metal pipe or other object to which the material according to the invention is to be applied is «This is particularly important with regard to the self-sealing properties of the coating materials according to the invention. In addition to the. Druok forces resulting from the property of the elastic memory of the thermo-resilient Part 11 revealed the fact that the material

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with elastic memory a higher coefficient of thermal expansion as the metal of the pipe or other base on which the material is applied, that the tube contracts less when it cools than the material with elastic memory, even if that. Tube is heated to the same temperature as this material o After the resilient part has cooled down This exerts an additional pressure that is higher than the pressure that is exerted when the spring-back Part is still hot after resetting.

In the above description, the application of the .Invention for applying protective coatings to pipe fittings

ψ bonds are particularly emphasized, but it should be noted that it also has many additional possible uses. The material according to the invention can thus be used to form a protective coating on the inner surface of pipes or pipe connections in those areas in which this protective coating is desired, e.g. when the entire inner surface of a pipe is covered with a protective coating so that corrosive liquids that would attack exposed metal surfaces can be challenged. With these execution

There is a difference in the thermal expansion coefficient between the resilient part and the pipe the endeavor that the pipe and the liner separate, but the mastic maase does the important job of creating an effective adhesive bond between the two To maintain sharing «

As mastic the invention is preferably a mixture of reclaimed rubber, and a material on asphalt base used for the Zweoke, which is obtained in the distillation of coal or petroleum products "That verv / ended material must thermoplastic and tii ± xö.'trop be d _e h. its viscosity

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decreases with increasing shear, materials with viscosities up to about 10 cP at 25 0 have been found to be suitable for the purposes of the invention, but even higher viscosity materials could be used if they are sufficiently thixotropic to be able to undergo pressure at ordinary temperatures exerted by the non-dimensionally stable under heat component which forms a part of the material of the invention, to flow _e in general, the viscosity of the material at the recovery temperature of the non-dimensionally stable in 'Värme ingredient is preferably in the range of 10-10 cP _o the softening point of the material is preferably in the range of 40-8O ⁰ C as measured by the ring and ball method. The interfacial tension of the mastic should be low and preferably low

about 5-40 ergs / cm are »The water absorption of the mastic mass should be low,

vorteilhaftesten for the purposes of the invention are generally mastixartige masses that are very tacky at room temperature _o This stickiness at room temperature is "very desirable since this reduces the adhesion of the protective coating increases the pipe ,, However, the stickiness of the mastixartigen material represents a major problem in the production, shipping and during the application of the inventive materials is ο often takes a long time between the coating of the non-dimensionally stable in heat constituents \ partly with the mastic and the ultimate application of the spring-back performance part on the pipe, the pipe joint Oodglo When the If the mastic compound were unprotected during this time, a wide variety of foreign substances would be able to collect on the exposed mastic surface, so that it would no longer be able to stick to the pipe, pipe connection or the like to which it is finally applied. Furthermore, the protective coating must often be pushed over a considerable length of pipe in order to bring it into the desired position. When the mastic coating is exposed, this pushing becomes extremely difficult, if not impossible. The stickiness that makes the mastic compound so beneficial creates it

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at the same time problems again.

The invention therefore has a great advantage in that an anti-stick coating is placed over the mastic compound, which must have several properties. Perhaps the most important of these properties is that this Coating under the temperature conditions at which the in the heat does not spring back the non-dimensionally stable component, forms a single phase with or in the mastic material Solution goes and stayed in solution at working temperatures The anti-stick coating must be mixable with the mastic compound. At or near room temperature, the speed P with which it goes into solution in the mastic compound, be extremely low, so that long-term effectiveness of the anti-stick coating is ensured is. In addition, the anti-adhesive material must not impair the adhesive properties of the mastic compound, if it is loosened in it during the reset o

It has been shown that certain hard waxes which ^{melt in the 50-90 0} O range form particularly effective anti-stick coatings. Carnauba wax is preferred. It was also found that wax-coconut mixtures, in particular mixtures of beeswax with colophony, are effective. Other waxes for the purposes of the invention are ouricurv wax, candelilla wafers and palm wax.

The wax is applied to the mastic layer, preferably in the form of an emulsion. After drying, it forms the Waohsemulsion preferably a clear, transparent 3PiIm, The anti-stick coating must not have a corrosive effect on its own or in combination with the mastic compound. The melting point of the Anti-adhesive material can be chosen at will. The choice depends on the required lifespan of the anti-stick coating and the time and temperature conditions that will be applied when resetting the in heat non-dimensionally stable component is caused. Because in general the time for the provision of many thermal springs Components is very short, anti-adhesive compounds are made of

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relatively low molecular weight preferred

In addition to the anti-adhesive material mentioned in the above examples, it was found that an emulsion which preferably consists of 100 parts of water, preferably 3 parts of polyvinyl alcohol, preferably 0.5 parts of sodium lauryl sulfate and 50 parts of a beeswax-rosin mixture (all parts by weight The proportion of beeswax to rosin can vary. With increasing amounts of beehive wax, the shelf life of the anti-stick coating is lower at 490 storage stability and good adhesive properties of the mastic * - mass after thermal resilience found the adhesive properties of the thermal resilience are with rising beeswax amounts better with a 7O: 3O mixture were pretty good shelf life (light tack after 1 week) at 49 ⁰ O and excellent adhesion strength nac. h of the thermal springback detected.

Using Garnauba wax emulsions, emulsions containing $ 10-15 solids turned out to be $ 80-90 consist of alkyl wax esters, as particularly suitable.

The thickness of the anti-stick coating must generally be at least about 2fi η . For most purposes, coatings are | a thickness of more than 0.5 mm not required For special purposes or for particularly large objects or asymmetrical or irregularly shaped objects, however, thicker wax coatings may also be required.

The thickness of the mastic on the material according to the invention can be within wide limits and depends on the size of the object to be protected. For example It has been shown that an inner mastic covering with a thickness of 0.38-0.5 mm is advantageous for resilient parts, which in the expanded state have an inside diameter of about

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38 now have, while a thickness of 0.5-0.63 mm is preferred for resilient parts that have an inner diameter of about 5-7.5 cm «outer coatings
Mastic on expandable objects of the same
Sizes can be much thicker, but it has been found that even very thin mastic coatings do their job reasonably well. For example, coatings as thin as 75 J &quot; were effective in certain cases.

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Claims (1)

1b048-03 Claims 1.) jVerbundinateriäl for the production of protective coatings, consisting of a) a part that has the property of thermal resilience, b) a flowable, viscous material that is applied to the surface of this part and c) a coating that prevents sticking is at least a portion of the non befindliehen with the thermoplastic springback part capable of contacting surface and applied such that it forms a single phase at the d resilience temperature with the flowable material. 2.) Composite material according to claim 1, characterized in that that at the springback temperature of the sticking-preventing coating in the flowable, viscous Material / dissolves. 3 «) composite material according to claim 1 or 2, characterized in that that the thermally resilient part has the property of elastic memory. 4.) composite material according to claim 1 or 2, characterized marked | indicates that the thermally resilient part is chemically or by radiation, in particular an ultraviolet ray ung, is crosslinked polymer. 5.) composite material according to claim 4, characterized in that that the polymer is a polyolefin, preferably polyethylene « 6.) Composite material according to claim 4, characterized in that that the polymer is a copolymer of ethylene and an alkyl acrylate. 109847/023/4 7.) Composite material according to claims 1 to 6, characterized in that the thermo-resilient part is tubular • _V- shaped. 8.) Composite material according to claim 7 *, characterized in that that the tubular thermo-resilient part contracts when resilient. 9.) composite material according to claim 7 or 8, characterized in, that the flowable, viscous material is applied to the P outer surface of the tube. 10.) Composite material according to claims 1 to 9 » characterized in that a mastic is used as the flowable, viscous material. 11.) composite material according to claims 1 to 10, characterized in that that the flowable, viscous material used is plastic. 12.) Composite material according to claims 1 to 11, characterized in that that the flowable, viscous material is thixotropic. 15.) Composite material according to claims 1 to 12, characterized in that that a flowable, viscous material one 13 ο Viscosity less than 10 - ^ cP at 25 C is used. 14.) Composite material according to claims 1 to 9, characterized in that a silicone or hydrocarbon grease is used as the flowable, viscous material, which was optionally made conductive by dispersing fine particles of a conductive material. 109847/0734 1h04803 15) composite material according to claims 1 to 14, characterized in that that the flowable, viscous material used at the resilience temperature of the resilient Partly has a viscosity between ICK and 10 cP. ■ 16.) Composite material according to claims 1 to 15, characterized in that that the softening point of the flowable, viscous material, measured by the ring and Kugol method, is between 40 and 80 ° C. IT.) Composite material according to claims 1 to 16, characterized in that that the sticking-preventing coating consists of a between 50 and 90 ° C melting wax. 18,) composite material according to claims 1 to 16, characterized in, that carnauba wax is used as the anti-sticking coating. 19.) composite material according to claims 1 to 16, characterized in, that a wax-rosin mixture or ouricury, candelilla- or palm wax is used. 20 ») composite material according to claims 1 to 16, characterized in that that the sticking preventing coating water, polyvinyl alcohol, sodium lauryl sulfate and a Contains beeswax and rosin mixture. 21.) composite material according to claims 1 to I9, characterized in that that the sticking-preventing coating has a thickness of 2.5 / u. to 0.5 nim. 22.) composite material according to claims 1 to 21, characterized in that that the thermally resilient part is tubular «· in the expanded state a 109847/0234 Diameter of about 38 rom and the inner layer of the viscous flowable material a thickness of 0.38 to Oj5 rom has » 23.) Process for coating bodies, characterized in that that the composite material of claims 1 to 22 is applied to the body to be coated and the resilience of the restorable part is effected, the arrangement being made so that in this Restoring the flow of the flowable, viscous material i | terials is effected and this is the one to be coated *. Body touches. 24 ») Method according to claim 25, characterized in that pipes or pipe connections used as bodies to be coated v / earth » 25.) Process according to claims 2j5 and 24, characterized in that that the body to be coated is heated before the protective coating is applied. 26.) Method for covering bodies according to claims 2J to 25, characterized in that a composite material consisting of a thermally resilient material is applied to the body Part of a mastic coating and that of a waxy coating that prevents sticking is covered, is applied in such a way that the wax layer of the surface of the body to be coated on The closest is that then the composite material is heated * with the thermo-resilient part of a Subject to change in shape, by which the mastic layer forcibly in contact with the body to be coated is brought, the waxy coating dissolves in the mastic, and that is finally cooled * 109847/0234 otoinal inspected 604803 27.) Method according to claims 23 to 26, characterized in that the therrnoruckfederungsfahige part of the composite material has a greater coefficient of thermal expansion than the body to be covered. 28.) Corrosion-resistant pipe consisting of the protect the pipe of a mastic layer containing wax in solution, and an outer layer of a water resistant thermal resilient Material with a greater coefficient of thermal expansion than the pipe, this Mastic layer due to the pressure exerted by the thermo-resilient material in the stand on the pipe surface SU flow. 7/0734; 0W61NM- ^{IN SPuC} if Blank page