DE2305911A1 - Assembling push-fit pipe joint - using a bactericidal lubricant - Google Patents

Abstract

Title lubricant comprises a bactericide and sufficient water-sol. thickener to form a paste, gel or viscous liq. The bactericide (pref. 10-20 wt.% rel. to H2O present) is pref. a quat. ammonium pyridinium or piperidinium cpd. contg. a 8-18C alkyl chain on the N-aton.

Description

Bactericidal Composition The invention relates to bactericidal lubricants and specifically relates to bactericidal lubricants used in the assembly of pipe joints can be used for water pipes.

When laying and repairing water pipes, there is a tendency that bacteria gain access to the interior of the pipelines and then the water infect flowing through the pipeline. A newly laid or repaired one Pipeline is therefore generally used before it is put into full operation rinsed with water, which contains chlorine in high concentration, to remove the bacteria to be removed from the pipeline. This treatment does have an effective one sterilization of the main part of the pipeline, but not removed in a satisfactory manner Way bacteria from the connections between adjacent lengths of pipe. For example when using iron pipes with lead connections, those with hemp are filled, bacteria present in the hemp continuously infect the water in it the pipe, despite all attempts, the pipe using chlorinated water to. sterilize.

This difficulty has recently become more acute with the introduction the so-called push-fit joints. The general form of this Connections is shown in the accompanying drawing, which shows in cross section the Shows end parts of two tubes 1 and 2, which are connected to one another by a plug connection 3 are connected. The end of the tube 1 has an enlarged diameter and is bulky the inside of a rubber sealing ring 4, which is suitably by a Groove 5 or some other means is held in place. To form the connection 3 the end of the # tube 2 is inserted into the end of the tube 1 and through the sealing ring 4 pressed, causing the ring to form a water-tight seal is compressed.

When flushing a pipeline containing such plug connections, with chlorinated water, entrapping air in the enlarged end part of each one Rohrs (i.e. in the space 6 shown in the drawing) and the contact of the sterilizing water with the inner surfaces d # connection is therefore greatly reduced. As a result, the sterilization is often incomplete and occurs in these rooms therefore bacterial growth subsequently occurs, thereby infecting the water in the pipe will.

As previously described, when creating a plug connection the rubber ring and / Xier that through the ring pipe end to be pushed coated with a lubricant to facilitate the connection. The lubricants used hitherto for this purpose have the disadvantage that they promote bacterial growth or that they disinfect the compound with chlorinated Actively impede water by creating a physical., Barrier and / or that Absorb chlorine.

A lubricant has now been developed which is a bactericide and therefore substantially reduces the growth of bacteria in the compound or prevented. This lubricant also does not hinder disinfection the connection with chlorinated water.

The invention therefore relates to a water and a thickener containing mass, in particular an aqueous lubricant, which is a bactericide and a water-soluble thickener and water, wherein the amount the thickener and the water is chosen so that the mass in the form of a Paste. a gel or a viscous liquid.

The invention provides a method for assembling a plug-in pipe connection accessible, in which on one or both of the pipe ends to be connected to one another the aqueous lubricant according to the invention is applied and the pipe ends under Forming a connector to be plugged into each other, the preferred bactericides are water-soluble nitrogen-containing compounds that have a pentavalent nitrogen atom in the form of a quaternary ammonium, pyridinium or piperidinium group, in which the nitrogen atom with a long chain alkyl group of 8 to 18 carbon atoms tied together is. A particularly preferred bactericide is cetyltrimethylammonium bromide (Cetrimide). Other suitable compounds include alkyldimethylbenzylammonium chlorides, Cetylpyridinium chloride, dodecyldimethyl-2-phenoxy-ethyl-ammonium bromide, 2,6-dimethyl diethylpiperidinium bromide and the polymeric quaternary compounds of hexamethylene bis-guanide (e.g. Vantocil I.B.).

The amount of bactericide in the lubricants is preferably relative high and is, for example, at least 10% by weight, preferably about 20% by weight, based on the weight of the water. Amounts less than 10% by weight, for example 5 wt% or more (on the same basis of reference) can be used in the results however, are less than satisfactory. The relatively high concentration of the bactericide is necessary because when the connector is formed, only a very small amount Part of the lubricant on the rubber ring passes, while the main amount is pushed out of the connection.

Any suitable water-readable thickener can be used however, preferred materials are water-soluble cellulose ethers such as Methyl cellulose, hydroxypropyl cellulose and sodium carboxymethyl cellulose.

The amount of thickener (and water) applied will be like this chosen that the mass is in the form of a paste, a gel or a viscous liquid is present. The exact amount of thickener required in each particular case varies depending on the working conditions, but it can easily change a routine attempt can be determined. It has been found that using 100 parts by weight of water about 5 parts by weight of methyl cellulose is satisfactory are.

It is preferred to use distilled water in the compositions according to the invention or However, using softened water is not essential.

The three components of the lubricant described above are water soluble and therefore get off the inside of the joint fairly quickly washed away. They therefore do not lead to any risk of poisoning or cause nothing Taste and smell in the water pipes.

The compositions according to the invention can also be antifreeze agents contain, such as ethanol or propylene glycol, so that the masses do not freeze 0 ° e entry. When using about 10 to 15% by weight of the antifreeze the masses do not freeze at 100 C.

The masses can also contain a water-insoluble thickener, such as silica or powdered plastic material. This is beneficial when connecting iron pipes with a large diameter of, for example, 700 mm should, with the tendency that the weight of the pipes, the lubricant is pushed away from the surfaces to be veneered, if not one of the mass a certain amount of a water-insoluble thickener is added.

The composition according to the invention can be packaged and stored for an unlimited period of time or it can also be prepared by immediately prior to use for example a suitable amount of water to a pre-formed mixture of the Bactericide and added to the thickener.

In order to better understand the invention, the following is provided only illustrative example. given.

Example A lubricant was prepared by dissolving 20 parts by weight Cetyltrimethylammonium bromide and 5 parts by weight of methyl cellulose in 100 parts by weight Water produced. The lubricant was in the form of a gel. When using it showed very satisfactory effects.

Claims (9)

P A T E N T A N S P R Ü C H E A mass containing thickener and water, thereby g e k Acknowledges that it contains a bactericide and that in bulk water soluble thickener and water in one to form a paste one Gels or a viscous liquid in a suitable proportion. 2. Composition according to claim 1, characterized in that g e k e n n z e i c h -n e t that it contains 10 to 20% by weight of the bactericide. 3. Composition according to claim 1 or 2, characterized in that g e k e n n -z e i c h n e t that it contains a water-soluble nitrogen compound as a bactericide which a pentavalent nitrogen atom in the form of a quaternary ammonium, pyridinium or piperidinium group in which the nitrogen atom with a long chain Alkyl group having 8 to 18 carbon atoms is linked. 4. Wet according to claim 3, characterized in that g e k e n n z e i c h -n e t that it contains cetyltrimethylammonium bromide as a bactericide. 5. Cup according to one of claims 1 to 4, characterized in that g e -k e n n z It is clear that it also contains an anti-freeze agent. 6. Composition according to one of claims 1 to 5, characterized in that g e -k e n n z It is true that they use a water-readable cellulose ether as a thickening agent contains. 7. Composition according to one of claims 1 to 6, characterized in that g e -k e n n z It is noted that it additionally contains a water-insoluble thickener. 8. Use of a mass according to any one of claims 1 to 7 as a lubricant. 9. Use according to claim 8 as a lubricant for the production of a Push-in pipe connection by applying the compound according to one of Claims 1 to 7 on one or both of the pipe ends to be connected.