DE2249517A1 - SEALING COMPOUNDS, PROCESS FOR THEIR MANUFACTURING AND APPLICATION, AND WORKPIECE COATED WITH A SEALING COMPOUND - Google Patents

Description

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8 Munc, ii3 / i2J - Gotthcrdstr. 81

Telephone ^r i6 17 Ä2. . . 9-9AQ R 1 * 7

Georg Fischer Aktiengesellschaft, ·. 8200 Schaffhausen

(Switzerland)

Sealing compoundj Process for their manufacture and their application as well as workpiece coated with a sealant

The present invention relates to a sealant, in particular For parts that are to be connected gas- and liquid-tight by screwing or plugging together on the basis of hardenable parts Synthetic resins and a method for producing this sealant, a method for applying the sealant on parts to be connected gas- and liquid-tight by screwing or plugging together, as well as one with the sealing compound coated workpiece.

It is known, particularly when it is to be screwed together

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Parts such as armatures, fittings, pipe parts and the like before screwing together on corresponding threaded parts apply liquid sealant and then the Parts to screw together. It occurs, for example, in the presence of iron or Cu or in the absence of 0 ″ chemical setting of the sealant takes place (for example Loctite). In this way of creating tight connections however, the plumber is dependent on the sealing compound, for example in liquid form, on the spot himself on the appropriate parts, which is time consuming, expensive and unreliable in terms of densities. As is also known to mention sealing in place using hemp, PTPE tape and the like.

An epoxy-based sealant has also been proposed been. However, the information disclosed is inadequate and does not suffice for a person skilled in the art to determine a sealant manufacture that meets today's requirements in terms of processing and use for fittings and pipe connections, especially for drinking water pipes.

(French patent 1.231-327).

The present invention bsscrocks the creation of a sealant, which makes it possible to manufacture ready-made parts that can be obtained from stock without additional efforts, such as attaching

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a DIchtungsrnasse or other Diehtungsteile, .an place -and point gas- and liquid-tight or can be screwed together.

This object is achieved by a sealing compound, which is characterized in that it corresponds polyaminoamide and / or Expoxydverbindungen and / or phenolic plastic, holds. . ·. _r . -

For such seals, apart from the sealing function, very specific properties, above all, also with regard to their processability, durability and toxicological harmlessness, required by that the combinations of substances according to the invention are met.

The invention is ansehliessand based on figures and Embodiments explained in more detail. ■.

It show:. ·· "- ■ -

Fig. 1 is a view of two screwed together gas and liquid serve to connect parts In the form of a rchrytückendes and a partial cut elbow fittings.,

Fig. 2 two tubular ige.Steckteile in front of your. Stuck together, partially cut,

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Fig. 3 shows a notice mandrel with a fitting part «in purely schematic representation.

Pig. 1 shows, before screwing, an elbow fitting 1 with an internal thread 3i which has a solid sealing layer 5 made of synthetic resin. This sealing layer has a thickness of, for example, between 20, depending on the size of the part 1 and 1000 / um, mostly between 100 and 300 / um »on and is The same thickness practically everywhere, the course of the sealing layer largely following the surface 3 of the wind.

The ratio of the layer thickness s to the diameter of the coating to be coated Lot will usually be less than 1:20, usually around 1: 100.

It is also a pipe end 7 with a conical threaded connector 9, which has an external thread 11, is shown.

These two parts 1 and 7 can be screwed together gas-tight and of course also liquid-tight without an additional process for sealing is necessary. The conical threaded connector 9 is screwed into the sealing layer 5 and tightened in the normal manner, as is the case with such connections.

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The bow fitting · 1, 5- applied to its inner thread 3, the Diehtungsschicht during manufacture of the fitting was _s may be for many years for storage, without the seal layer undergoes 5 nächteiligen any changes.

In Fig. 2 is a plug connection (before; plugging together) an outer pipe 16 with a solid sealing layer '18 made of synthetic resin and an inner pipe 20 with a conical pipe end 22 can be seen. The connection of these two parts. 16 and 20, which especially at low pressures, for example wastewater, is usable, takes place in such a way that the conical pipe end 22 is pressed into the outer tube 16, the sealing layer 18 being deformed and the two parts 16 and 20 connects to each other in a gas- and liquid-tight manner.

The sealant is preferably, as shown, only on attached to a part. But it is also possible to use the sealant at the two overlapping parts of the two to be joined To attach parts.

For applying the sealant to an internal thread serves a device as it is shown purely schematically in Fig. 3. '. ■

This Figi 3 shows part of a longitudinal section through a

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Pitting 25, one end of which is provided with a thread 27. The sealing compound 29 is indicated. Their application takes place by means of a rotating mandrel 30, the end of which has a Part of the lateral surface - it can also be the entire lateral surface - carries a thread 33 which corresponds to the fitting thread 27 is equivalent to. The mandrel shaft 31 is provided with a longitudinal bore 35 for feeding in the liquid sealant. the Bore 35 branches into radial bores 37 through which the sealant can leak.

For coating, the rotating mandrel 30 is moved in the direction of the arrow into the fitting 25 and lets the mass flow in. The gap between the thread 27 of the fitting is then filled and the thread 33 of the mandrel 30 with the sealing compound 29. By turning back the mandrel 30, the sealing compound, Denoted by 39 in dash-dotted lines, distributed evenly on the fitting thread 25.

It is also possible to provide the part of one part, for example the inner bore, with the sealing coating without prior to cut a corresponding thread in this part. When joining, the with an external thread provided part of the other part a corresponding thread in the sealing lining. Here he takes over

In

Synthetic resin flooring not only seals, but also that

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mechanical connection of both parts «

Apart from the advantage that, as mentioned, the sealant during fitting production or thread production can be applied to the thread or to parts to be plugged together, and not first; when assembling, is the connection can be removed again if necessary. In most cases, the connection is always there when the screws are screwed again still tight «It is also possible to put the two parts against each other surtick to turn, for example by 45 °, without a Change in sealing effect occurs »This is during" assembly work important. The sealing cover is also secure to the touch and when stored under normal environmental conditions, For example, with fittings lying on top of one another, “not sticking together and sticking, not even with other parts, dust particles, dirt, etc. Such connections allow under among other things, compared to the previous one, a significant time saving during assembly and thus a noticeable reduction in price.

In the following, the method for Production of the sealant and the coated areas on the parts to be joined. 'It is in particular shown on what basis the sealant is obtained. It should be noted that this sealant in the case of the parts resulting from the manufacture, adheres to the part as a solid coating made of synthetic resin.

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The requirements of the German Association of Gas and Water professionals are qualified by the following! »© n Sealing compounds met in every way.

The coatings produced from this serve to seal off the coating screw connections, tolerance compensation of threads and corrosion protection. The hardened coatings are .physiological Perfect (suitable for drinking water pipes) resistant to solvents and show a very high on the thread surface Adhesive strength and a non-sticky, smooth surface

example 1

16O g are used to produce the sealant reactive polyamino amide (amine number 300) from di · *. and trimerized fatty acids and polyamine with

ι 140 g of finely ground graphite (particle size <70 / um) and

Methyl ethyl acetone ■

160 ml of a mixture of equal parts of toluene and a high-speed stirrer were intensively mixed.
The approach will then

14o g of a diglycidyl ether of bisphenol A - viscosity 25 ö,.

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150 P, Epoxyt equivalent 200 - and 5 g of a thixotropic agent Silica based added with slow stirring.

The mass is applied to the cylindrical internal thread of

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-Fittings made of malleable cast iron with a layer thickness of 150 180 / um applied and then in a drying tunnel cured with a residence time of 15 min. at 120 G.

The mass is applied at a circumferential speed of up to about 1.5 m / sec (preferably 0.3-0.6 m / sec) along the circumference of the thread applied and can be optimally processed for up to 36 hours (Pot life). ■. ■

The coating shows no visible changes in extreme Lagerbedinungen such as temperatures of 8O ⁰ C or storage in hot water of 95 ° C. 'r

When screwing the cylindrical internal thread of the malleable cast iron fitting, which is provided with the sealing coating, to the conical external threads of a steel pipe were maximal. Torques of 5 - 10 iakp measured, i.e. less than normal with hemp seals. · '

The screw connections were then tested with pressurized water of 25 ° (and 95 ° C) and even showed no leakage up to a pressure of 200 atü. '' -

The screw connections can also be used after a long period of use loosened without damaging the thread and if necessary again

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to be tightly connected. The sealant is also for Plug connections, e.g. usable according to Fig. 2 »

Ranges of variation for example 1 ;

1. Polyaminoamide: epoxy = 1: 8 to 5: 1

preferably : 1 : 3 to 3: 1

1.1 Amine number of the polyaminoamide: 70 to ^ 50 preferably 85 to 300

1.2 epoxy equivalent 120 to 1000 preferably, 200 to 500

2. Minimum amount of thixotropic agent based on silica: 0.3 Guw. # Based on the total dry matter.

3. Graphite max. 70 wt. S, preferably 10 to ** 0 wt.

¹ U solvent 20 to 70 wt. ^, Preferably 30 to 50 wt. 5S.

Example 2

80 g of a reactive polyaminoamide are placed in a stirred vessel (Amine number 90) from di- and trimerized fatty acids and polyamine dissolved in equal parts of xylene and butanol at 60 C and Stir in 20 g of a powdery phenol resol.

The approach is then set at 25 ° C

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100 g of finely divided graphite and 2 g of thixotropic agent with stirring.

The sealant is applied to the degreased cylindrical internal thread of -i "-T fittings applied analogously to Example .1, so that after drying a layer thickness of 150 - 200 / um is reached, then the sealing lining is cured at 200 ° C for 30 minutes.

It is easy to screw in conical external threads; maximum torques of 7 - 9 mkp are measured.

The spoilage was found in pressure tests with water and heating oil at temperatures up to 100 ° C and pressures up to 200 atü as completely tight.

The screw connections can also be used after 10 days of storage 80 C can be removed again without damaging the fitting.

The mass is physiologically harmless, solvent-resistant, and prepares when applied to the parts longer pot life poses no difficulties and serves both the sealing of screw connections as well as the thread tolerance compensation and corrosion protection.

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The mass can easily be stored for 6 months.

Variation widths for example 2 :

1. Polyaminoamide: phenolic resol 2: 1 to 10: 1 preferably 3 ί 1 to 6: 1

Amine number of the polyaminoamide: 70 to preferably 85 to JOO

2. Graphite: maximum 75 Qew _# ji

preferably 25 to 50 Qew "$

Example 3

600 g of a diglycidyl ether of bisphenol A (Pp 72 ⁰ C, epoxy equivalent 580)

were resolved in

10 ml of methyl isobutyl ketone and 70 ml of xylene.

To this is added with stirring a solution of 38O g of a novolak (Pp 75 ⁰ C) and 20 g of hexamethylenetetramine in 400 ml of ethanol.

Then the approach will be

240 g of finely ground graphite and 60 ml of ethyl acetate.

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The sealing compound is applied as described in Example 1 to the degreased cylindrical internal thread of -i "T-shaped fittings so that, after drying at 120 ^° C., a layer thickness of 260-270 / u is achieved Cured at 210 ^° C. for 20 minutes.

The parts prepared in this way can also be removed before use, i.e. until the tight connection is established, during store for a long time without the hardened sealant changing or showing undesirable effects.

It is easy to screw in conical external threads; maximum torques of 7 - 9 mkp are measured.

The screw connections proved to be completely tight in pressure tests with water and heating oil at temperatures of up to 100 ^° C. and pressures of up to 200 atmospheres. The unions could he be released from 8O ⁰ C without damaging the fittings even after one year of service life with passage of Heisswass. ■

Example 4

700 g of a diglycidyl ether of bisphenol A (melting point 60 ° C,. Epoivdäquivalent 500) were in a mixture of 200 ml of methyl isobutyl ketone and

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100 ml of xylene dissolved and

450 g of phenol resol (55 % in butanol) were added.

The approach were

280 g of finely ground graphite together with 10 g of 55 % phosphoric acid in 50 ml of butanol.

The sealant was applied to the threads and dried as described in Example 1. For the curing of the sealing gasket 15 has been min. Heated at 19O ⁰ C. During pressure tests, as described in Example 2, all screw connections remained tight.

The application of the sealing compound described above is gas- and liquid-tight by screwing or plugging together Parts to be connected are made by applying the liquid sealant to one or both parts and with it a squeegee to a coating at least approximately everywhere of the same thickness. This topping will then be used cured, whereupon, as stated, it can be stored practically indefinitely without any noticeable change. It it is possible to introduce the sealant into the doctor blade and guide it through holes on its outer surface, so that the application of the sealing compound and its spreading takes place immediately one after the other and in a coordinated manner.

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For threaded fittings or threaded pipes, use as Squeegee a mandrel that rotates with respect to the workpiece and has at least partially a threaded outer surface has j where the thread corresponds to that of the fitting or Pipe must correspond, since the thread of the workpiece should be reproduced as precisely as possible by the mass. Instead of of the mandrel can also be a washer be used. As already explained in the examples, after the work piece has been coated, the sealant hardened.

With such a method, the application speed along the circumference of the thread is up to 1.5 m / sec., Preferably 0.3 to 0.6 m / sec. measured in the circumferential direction of the fitting or the pipe.

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Claims (1)

Ι · '■ . ' ' ■ ir »; -. ■■■ - »tt t, '■■■' * F at e η ta η s ρ r ü c h β 1. sealant, particularly for by screw \ or plugging gas and liquid tight to comparable "' ^h I binding parts based on curable synthetic resins, ■ ί characterized in that they are Polyamlnoamid- and / or ι Contains epoxy compounds and / or phenoplasts. 2. Sealing compound according to claim 1, characterized in that that it contains polyaminoamide and epoxy compounds. . Sealing compound according to claim 1, characterized in that that they contain polyaminoamide compounds and phenoplasts ■ ■ ■ lasts. 4. Sealing compound according to claim 1, characterized in that it contains epoxy compounds and phenoplasts. 5 · Sealing compound according to claim 2, characterized in that it contains polyaminoamide and epoxy compounds in a ratio between 1: 8 and 5 ί 1, preferably polyaminoamide to epoxy is 1: 3 to 3 '· 1. - 16 309817/1032 6. Sealing compound according to claim 2 or "j5 * characterized in that that the Ainnummer of the Eolyaminoamids 70 to 450, preferably 85 to 300. 7. Sealing compound according to claim 2 or 4, characterized in that the epoxy equivalent is 120 to 1000, preferably 200 to 500. 8. Sealing compound according to claim!,. Characterized in that that they have a thixofacilant, for example Silica based, contains .. 9. Sealing compound according to claim 1, characterized in that that they contain a lubricant, for example graphite powder, in a weight fraction of the total dry substance of a maximum of 75 wt. $, preferably 10 to 50 wt. #, - contains. 10. Sealing compound according to claim 1, characterized in that it, based on the total dry substance, 20 to 70 wt. Fo, preferably 30 to 50 wt. %, Solvent .contains. 11. sealing compound according to claim 3 or 4, characterized. that it contains a phenolic resole and / or a phenolic novolak. - 17 309 8 17/1032 12. Sealing compound according to claim 3 *, characterized in that that it contains polyaminoamide and phenol resol in a ratio of 2: 1 to 10: 1, preferably 3: ί to β: 1. Yj). Process for producing a sealing compound according to one or more of Claims 1 to 2, characterized in that either polyaminoamide and / or epoxy compounds and / or phenoplasts are mixed with solvents with the addition of lubricants and / or thixotropic agents. 14. The method according to claim 13, characterized in that the polya.ninoamide and epoxy compounds in one Ratio between 1: 8 to 5: 1 »preferably 1: 3 to 3: 1-, the amine number of the polyaminoamide 70 to 450, preferably 85 dIs 300, and that Epoxydaeciuivalent 120 to 1000, preferably 200 to 500, and with the addition of thixotropic agents and lubricants, preferably graphite, mixed together with solvents. 15 · The method according to claim 13, characterized in that the polyaminoamide is a condensation product of dimerized and trimerized fatty acids and polyamine, and the epoxy compound a diglycidyl ether of bisphenol A and, as a solvent, a mixture of aromatics, for example tolnol, - 18 3 0 9 8 17/1032 ^ 2248517 and ketones, for. Example methyl ethyl ketone is used. ΐβ. The method according to claim 13, characterized in that one .a polyaminoamide with an anine number of 70 to 450, preferably 85 "to 300, and a phenolic plastic from Phenol resol and / or novolak type, optionally with a formaldehyde donor such as hexamethylenetetramine Addition of lubricants and / or thixotropic agents mixed with solvents, the ratio of polyaminoamide to PhenoZplast preferably being 2: 1 to 10 i 1. . 17 · The method according to claim 13, characterized in that one an epoxy compound, preferably a diglycidyl ether of bisphenol A and a phenoplast from the phenol resol- and / or novolak type combined and optionally mit.einem reaction accelerator, such as phosphoric acid, under Addition of lubricants and / or thixotropic agents and solvents mixes. . . l8. Method for applying a sealant according to a or several of claims 1 to 1.7, closed gas- and liquid-tight by screwing or plugging together connecting parts, characterized in that the liquid sealing compound is applied to at least one part, with a doctor blade to an at least approximately - 19 3 0 9 8 17/1032 V * * t ! O 224951? all covering of the same thickness while reshaping the surface of the part passes, and then this covering hardens. 19. The method according to claim 18, characterized in that the mass through the outer surface of the doctor blade Part feeds. 20. The method according to claim 18, for threaded fittings or threaded pipes, characterized in that the squeegee is a mandrel or rotating with respect to the workpiece a washer is used, the outer surface of which is at least partially covered with a thread corresponding to the workpiece Threaded 1st » 21. The method according to claim 18, characterized in that ' a layer with a thickness between 20 to 1000 / an, preferably 100 to 500 / um, is measured after drying, brings up. 22. The method according to claim 18, characterized in that one the sealant with a peripheral speed of a maximum of 1.5 m / sec., preferably 0.3 to 0.6 m / sec., applies. -20 ~ 309817/1032 2 ^. According to the method according to one or more of the claims l8 to 22 workpiece coated with a sealing compound made from a hardened synthetic resin system, characterized in that that the sealing compound is shaped on its surface of the workpiece surface to be sealed and either polyaminoamide and / or epoxy compounds and / or a phenoplast, with during storage of the workpiece, the mass, the sealing properties preserved. 24. Workpiece according to claim 25 *, characterized in that the hardened coating remains chemically non-reactive and is preferably shock and impact resistant. 25. Workpiece according to claim 2J, characterized in that the covering exclusively on the inner surface of the sealing section is upset. 26. Workpiece according to claim 2 "5, characterized in that it is designed as a closure cover. 27. Connection of workpieces according to claim 2J, characterized in that that the one, threadless part of the one Work piece provided with a cover ^ Lst and the corresponding Part of the other workpiece with a thread,. . P- - 21 -. , ■. ■ ■■ - 3098 17/1032 ^: ' Blank page