EP2024713A1 - In-line-messgerät mit einem innen mit polyurethan ausgekleidetem messrohr und verfahren zu dessen herstellung - Google Patents
In-line-messgerät mit einem innen mit polyurethan ausgekleidetem messrohr und verfahren zu dessen herstellungInfo
- Publication number
- EP2024713A1 EP2024713A1 EP07729763A EP07729763A EP2024713A1 EP 2024713 A1 EP2024713 A1 EP 2024713A1 EP 07729763 A EP07729763 A EP 07729763A EP 07729763 A EP07729763 A EP 07729763A EP 2024713 A1 EP2024713 A1 EP 2024713A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- liner
- measuring device
- polyurethane
- line measuring
- primer
- 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- Withdrawn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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1009—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe
- F16L58/1027—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe the coating being a sprayed layer
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/006—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus characterised by the use of a particular material, e.g. anti-corrosive material
Definitions
- the invention relates to an in-line measuring device, esp. A flow meter, for measuring a fluid flowing in a pipeline, wherein the in-line measuring device, esp. Magnetic-inductive, with a measuring transducer in the course of the pipeline inserted, internally lined with a liner measuring tube for guiding the fluid to be measured, and wherein the liner is made of a polyurethane, which is prepared using a metal-organic compounds containing catalyst. Furthermore, the invention relates to a method for producing the aforementioned in-line measuring device.
- in-line measuring instruments with a magnetic-inductive transducer can be known to measure the flow velocity and / or the volume flow of an electrically conductive fluid which flows through a measuring tube of the measuring transducer in a flow direction.
- a magnetic field is generated in the magnetic inductive transducer by means of mostly diametrically opposite field coils of a magnetic circuit arrangement electrically connected to an excitation electronics of the in-line measuring device, which passes through the fluid within a predetermined measuring volume at least partially perpendicular to the flow direction and which is substantially outside the Fluid closes.
- the measuring tube consists mostly of non-ferromagnetic material, so that the magnetic field is not adversely affected during measurement.
- an electric field is generated according to the magneto-hydrodynamic principle in the measuring volume, which is perpendicular to the magnetic field and perpendicular to the flow direction of the fluid.
- a voltage induced in the fluid can thus be measured, which in turn is a measure of the volumetric flow rate.
- the fluid-contacting, galvanic or the fluid non-contacting, capacitive measuring electrodes can serve.
- the magnetic circuit arrangement For guiding and coupling the magnetic field into the measuring volume, the magnetic circuit arrangement usually comprises spool cores enveloped by the field coils, which are in particular diametrically spaced apart from each other along a circumference of the measuring tube and each with a free end-side end face, esp. Mirror image, are arranged to each other.
- the magnetic field generated by means of the field coils connected to the excitation electronics is thus coupled via the coil cores into the measuring tube such that it passes through the fluid flowing between the two end faces at least in sections perpendicular to the flow direction.
- in-line measuring devices with magnetic-inductive transducers for measuring flow velocities and / or volumene flows flowing fluids often also by means of ultrasound acoustic measuring in-line measuring devices with a corresponding ultrasonic transmitter and - receiver having measuring tube used ,
- the liner also serves as electrical insulation between the support tube and the fluid, which prevents shorting of the electric field via the support tube.
- Polyurethanes are usually elastomeric plastics which are produced on the basis of a liquid multicomponent system formed from reactive starting components immediately before processing, the latter in each case after mixing together with the inner wall of the carrier pipe which has previously been treated with an adhesion promoter, the so-called primer is applied and allowed to cure there within a predetermined reaction time to the liner.
- a primer for example, a paint or coating plastic, such. a synthetic resin varnish, an alkyd varnish, an acrylic paint, a dispersion paint, a silicate paint, an epoxy resin or the like.
- Polyurethanes are known to be prepared by the polyaddition process of di- and poly-fcocyanaten with dihydric or polyhydric alcohols.
- starting components which may be used here are prepolymers composed of aliphatic and / or aromatic ether and / or ester groups and also glycol and isocyanate groups which can react appropriately with the dihydric or polyhydric alcohol supplied.
- powdery or pasty optionally also coloring fillers, such as. Carbonates, silicates, carbon black, pigments or reactive dyes, mixed.
- liners consisting of polyurethane
- a so-called ribbon flow method is often used, in which the previously prepared liquid multicomponent system evenly distributed by means of a corresponding casting or spray head on the suitably moving, possibly pretreated inner wall of the support tube becomes.
- the reaction time of the multicomponent system required thereafter for hardening can be adjusted to a considerable extent in addition to the metering of the starting components by a suitable guidance of the processing temperature.
- short reaction times of less than one minute, as required for cost-effective production of the liner at a processing temperature which is approximately at room temperature can usually only be achieved by adding a suitable, usually heavy metal and / or amine catalyst to the multicomponent system.
- catalysts In particular, tertiary amines and / or mercury are used. In view of the fact that the catalyst itself remains substantially unchanged in the finished polyurethane, the latter then inevitably also toxic, but at least not physiologically harmless compounds on this extent. Numerous studies have also shown that especially the catalyst can be dissolved out of the liner to a considerable extent, at least in the presence of water. The same is to be considered for any remaining in the liner, unreacted residues of the one or the other starting component or reaction intermediate or reaction by-products thereof into consideration.
- the polyurethanes currently used in in-line gauges are only conditionally suitable for applications with high hygienic requirements, such as e.g. For measurements in the drinking water sector, suitable because the high requirements in terms of chemical resistance and physiological compatibility posed in the drinking water sector for fluid-contacting components can no longer be fulfilled without further ado.
- comparatively expensive liners made of PFA, PTFE or hard rubber are currently being used, especially in the drinking water sector.
- M max ⁇ oc maximum tolerable migration rate
- TOC total organic carbon content
- SML toxicological critical substances specific migration limits
- An object of the invention is therefore to provide an in-line measuring device with a, esp. Magnetic-inductive, with a measuring tube inside specify liners that has good physiological, organo-leptic and bacteriological properties.
- the in-line measuring device should be accessible to as broad a range of application areas as possible, especially in the drinking water sector. Accordingly, the transducer, esp. Its measuring tube, if possible also be able to meet the high chemical-biological and hygienic requirements set for drinking water applications.
- an in-line measuring device for measuring a fluid flowing in a pipeline
- serving to guide the fluid to be measured measuring tube comprises, which is formed by means of a, esp. Metallic, support tube and by means of this lining inside liner, wherein carrier tube and liner with the interposition of a mediating primer adhere to each other, and both liner and primer each at least partially from a, esp.
- suitable polyurethane consist.
- the invention consists in a method for producing a measuring tube of an in-line measuring device, esp. An in-line measuring device according to one of the preceding claims, wherein the measuring tube has a support tube and a liner lining this inside, which method the following steps include:
- Multicomponent system containing isocyanate, in particular diisocyanate, and a dihydric or polyhydric alcohol,
- in-line measuring device for measuring a flow and / or a flow rate of water flowing in a pipeline, esp.
- the polyurethane of the liner and the polyurethane of the primer are different.
- liner and primer at least partially from substantially the same
- Polyurethane exist.
- a third embodiment of the in-line measuring device of the invention is provided to use for both the liner and for the primer each polyurethane, which is suitable for drinking water.
- the polyurethane of the liner and / or the polyurethane of the primer comprises aromatic and / or aliphatic compounds.
- the polyurethane of the liner and / or the polyurethane of the primer esp. Aliphatic, ether groups.
- the polyurethane of the liner and / or the polyurethane of the primer, esp. Aliphatic, ester groups are provided.
- at least the polyurethane of the liner is prepared using a metal-organic compounds containing catalyst.
- an eighth embodiment of the in-line measuring device of the invention is intended to use such a catalyst for the production of the liner that with this catalyst in the liner possibly introduced and remaining there
- the catalyst used at least for the production of the polyurethane of the liner contains tin and wherein the liner organic, in particular aliphatic, has bound tin.
- the catalyst used at least for the production of the polyurethane of the liner is substantially free of heavy metals.
- the catalyst used at least for the preparation of the polyurethane of the liner is substantially free of amines.
- the polyurethane of the primer is prepared using a catalyst containing organometallic compounds.
- the polyurethane of the liner and the polyurethane of the primer are prepared using the same catalyst.
- the polyurethane of the liner and / or the polyurethane of the primer is prepared by means of at least one multicomponent system based on, esp. Aromatic and / or aliphatic, Isocyanates, esp. Based on diisocyanates, and dihydric or polyhydric alcohol, such as a butanediol, is formed.
- the at least one multicomponent system is formed on the basis of monomeric and / or prepolymeric and / or polymeric isocyanates.
- the at least one multicomponent system is prepared using diisocyanates, esp. Of diphenylmethane diisocyanate (MDI), hexane diisocyanate (HDI), Toluylendiisocyants (TDI) and / or fcophorondiisoyanat (IPDI).
- MDI diphenylmethane diisocyanate
- HDI hexane diisocyanate
- TDI Toluylendiisocyants
- IPDI fcophorondiisoyanat
- the polyurethane of the liner and / or the polyurethane of the primer is prepared by means of at least one multi-component system based on, esp. Aromatic and / or aliphatic, Isocyanates, esp. Based on diisocyanates, and dihydric or polyhydric alcohol is formed, which is formed as a prepolymer.
- the alcohol is a prepolymer based on castor oil.
- both the liner and the primer is substantially free of heavy metals.
- both liner and the primer substantially free of amines is.
- the liner has a thickness of less than 8 mm, esp. Less than 4 mm.
- the primer has a thickness of less than 500 microns, esp. Less than 300 microns.
- the measuring tube has a nominal diameter which is less than or equal to 2000 mm.
- the measuring tube has a nominal diameter which is greater than or equal to 25 mm.
- the in-line measuring device of the invention comprises the
- Measuring transducer arranged on the measuring tube magnetic circuit arrangement for generating and guiding a magnetic field which induces an electric field in the flowing fluid, and measuring electrodes for picking up in the flowing fluid induced electrical voltages.
- the catalyst of the second multicomponent system esp. Of a physiologically harmless metal formed, metal-organic compounds such. tin organo compounds or the like.
- the catalyst of the second multicomponent system comprises tin-organo compounds, in particular di-n-octyltin compounds.
- the catalyst is a di-n-octyltin dilaurate and / or a di-n-octyltin dimalinate.
- the prepolymer of the first and / or the second multicomponent system has at least two reactive NCO groups.
- the prepolymer of the first and / or the second multicomponent system having aromatic and / or aliphatic isocyanate groups.
- the first and / or the second multicomponent system contains monomeric and / or prepolymeric and / or polymeric isocyanate.
- the first and / or the second multi-component system is formed using a prepolymer based on diisocyanate.
- the prepolymer of the first and / or the second multicomponent system based on diphenylmethane diisocyanate (MDI), hexane diisocyanate (HDI), Toluylendiisocyants (TDI) and / or fcophorondiisoyanat (IPDI) is formed ,
- the first and / or the second multicomponent system esp. Aliphatic and / or aromatic, ether groups and / or, esp. Aliphatic and / or aromatic, ester groups having.
- the alcohol of the first and / or the second multicomponent system is a diol, in particular a butanediol.
- the alcohol of the first and / or the second multicomponent system is a prepolymer formed on the basis of castor oil.
- the first multicomponent system also contains a catalyst.
- the catalyst of the first multicomponent system especially of metal-organic compounds formed by a physiologically harmless metal, e.g. tin organo compounds or the like.
- the catalyst of the first multicomponent system comprises tin-organo compounds, in particular di-n-octyltin compounds.
- this is carried out at a processing temperature of less than 100 0 C, esp. At about 25 ° C.
- the invention is based i.a. on the surprising realization that liners or
- a basic idea of the invention is to use both for the production of, possibly also multi-layered, constructed liner as well as for the underlying, possibly also multi-layered, primer suitable for drinking water polyurethane. This is achieved in particular by using those polyurethanes in which any monomeric and / or metallic residues remaining from the preparation also have no harmful effects and / or diffusion rates that are prohibitively high for drinking water applications.
- the liner such a polyurethane, which is prepared with the addition of a metal-organic, yet amine-free and / or heavy metal-free catalyst.
- a catalyst based on metal-organic compounds can be achieved that the part of the catalyst used in the liner introduced metals physically and / or chemically, esp. Atomically and / or by cross-linking, bound to carbon chains and so far rather resistant and permanently embedded in the polyurethane.
- An advantage of the invention is i.a. in that primer and liner can be produced at least proportionally with the same starting components, whereby the manufacturing costs of the measuring tube, esp. The purchasing, storage and logistics costs for the starting components of liner and primer, and to that extent the manufacturing cost of the in-line meter Total can be reduced.
- Fig. 1 shows in perspective a side view of a measuring tube for a, esp. Magnetic-inductive, in-line measuring device, and
- FIG. 2 shows in a longitudinal section the measuring tube of FIG. 1.
- Measuring transducer of an in-line measuring device shown which serves to measure a in a - not shown here - flowing fluid, for example, its flow rate and / or its volumetric flow rate.
- the InLine measuring device can be, for example, a magnetically-inductive or ultrasonically-measuring flowmeter.
- the in-line meter is intended to be used in drinking water distribution networks.
- the measuring tube 1 has a, esp. Metallic, support tube 2 of predeterminable lumen and a tubular, consisting of an insulating liner 3 of predeterminable width.
- the support tube 2 is made of a non-ferromagnetic material, such as stainless steel or other stainless metal, and coaxially surrounds the liner 3 so that it completely lines the support tube 2 inside and thus virtually completely isolated from the fluid flowing during operation.
- the liner 3 of the in-line measuring device according to the invention consists at least partially of a polyurethane (PUR 3 ).
- PUR 4 polyurethane
- the primer 4 for example, in the manufacture of the measuring tube in the liquid state thinly applied to the inner wall of the support tube 2, for example, sprayed or painted, be.
- the primer 4 forming polyurethane (PUR 4 ) has been at least partially, in any case sufficient for further processing on the inner wall of the support tube 2 cure, then the actual liner 3 can be prepared, for example, characterized in that provided for flowable polyurethane ( PUR 3 ) is applied to the inner wall of the support tube 2 in a spin-coating process or in a so-called ribbon-flow process, where it is distributed over the entire area and as evenly as possible.
- the measuring tube is provided for use in an in-line measuring device with a magnetic-inductive transducer.
- the transducer further comprises a magnetic circuit arranged on the measuring tube for generating and guiding a magnetic field, which induces an electric voltage in the flowing - here electrically conductive - fluid, and measuring electrodes for tapping induced in the flowing fluid voltages.
- the magnetic circuit arrangement usually has two field coils, which are connected in the measuring mode with a - not shown here - generating variable electrical currents of predeterminable current strength excitation electronics of the in-line meter and at least temporarily flowed through by a corresponding exciter current.
- the magnetic field generated thereby passes through the fluid flowing within the measuring tube 1 at least in sections perpendicular to its flow direction.
- the measuring transducer has a sensor arrangement attached to the measuring tube 1, comprising a first and a second measuring electrode 31, 32. These are diametrically opposed to each other, wherein a diameter of the measuring tube 1 imaginarily connecting the measuring electrodes to a diameter of the measuring tube 1 connecting imaginary the field leads perpendicularly.
- the measuring electrodes 31, 32 if necessary, esp. In more than two measuring electrodes on the measuring tube 1 are spaced from each other so that they are not diametrically opposed. This may for example be the case when additional measuring electrodes for reference potentials or horizontal mounting position of the measuring tube 1 measuring electrodes for monitoring a minimum level of the fluid in the measuring tube 1 are provided.
- the measuring tube 1 furthermore has a first flange 5 at a first measuring tube end and a second flange 6 at a second measuring tube end.
- Carrier tube 2 and flanges 5, 6 are in the embodiment shown here in each case of circular cross-section.
- the support tube 2 is first provided with the desired length and possibly with required for the insertion of electrodes or field coils lateral jacket openings. Likewise, the metal flanges 5, 6 are prepared accordingly. Then, at each end of the support tube 2, one of the flanges 5, 6 is pushed over its outer side. Then, a respective rear side of the respective metal flange 5, 6 mechanically fixed and tightly connected to the outside of the support tube 2. This can occur when using a metallic support tube and metallic flanges, for example by soldering, brazing or welding, resulting in a corresponding solder, brazing or weld seam 7.
- the gap formed by the flanges 5, 6 and the support tube 2 - can be closed by means of a circumferential plate as is customary in magnetic-inductive transducers in particular.
- the gap can be used in the event that the measuring tube for a magneto-inductive transducer, for example, for receiving the magnetic field generating field coils and other components of the mentioned magnetic circuit arrangement. If the sheet is to serve as part of the magnetic circuit, it is preferably ferromagnetic form.
- the in-line measuring device is also used in particular to measure those fluids which are subjected to increased requirements in terms of chemical-biological as well as bacteriological purity, such as drinking water. Therefore, it is further provided in the measuring tube 1 according to the invention that both the polyurethane (PUR 3 ) for the liner 3 and polyurethane (PUR 4 ) for the primer 4 each suitable for use in the drinking water area, esp. Also admitted, is.
- the polyurethane (PUR 3 ) for the liner 3 and the polyurethane (PUR 4 ) for the primer 4 are each designed so that despite prolonged contact with the fluid to be measured, esp.
- Drinking water at least no impermissibly high, but possible would not cause any contamination of the fluid by ingredients contained in the liner and / or in the primer - be it the reacted polyurethanes themselves or any included unreacted residues of individual starting components, reaction intermediates and / or reaction by-products thereof, or any metals or metal compounds introduced.
- the liner 3 as well as for the primer 4, for example, in each case one such polyurethane can be used which has aliphatic and / or aromatic ether groups and / or the aliphatic and / or aromatic ester groups.
- both the polyurethane (PUR 3) for the liner 3 and the polyurethane (PUR 4 ) for the primer 4 may be formed on the basis of monomeric and / or prepolymeric and / or polymeric cocynates, if appropriate also by means of trimers derived therefrom.
- the polyurethane (PUR 3 ) of the liner 3 is based on a first liner starting component (A 3 ) contained by means of a fcocynate, in particular diisocynate, and a second or polyhydric alcohol containing second liner-starting components (B 3 ) formed multi-component system is prepared.
- the polyurethane (PUR 4 ) of the primer 4 based on a by means of a fcocynat, esp.
- Diisocyanate and / or higher isocyanate contained first primer starting components (A 3 ) and a dihydric or polyhydric alcohol produce containing second primer-starting components (B 3 ) formed multicomponent system.
- first primer starting components A 3
- second primer-starting components B 3
- the liner 3 As well as the primer 4 suitable for drinking water in the above sense, according to a further embodiment of the invention for the production of the polyurethane used for the liner 3 (PUR 3 ) as well as for the production of the polyurethane used for the primer 4 (PUR 4 ) inter alia, in each case dispensed with the use of a heavy metal-containing and / or an amine-containing catalyst, although these types of catalysts would actually be very advantageous because of their good reactivity for dimensionally stable production of the liner 3 as well as for the preparation of the primer 4.
- a polyurethane (PUR 3 ) is used, which with the addition of a metal-organic compounds having, in this respect serving as a third liner-starting component catalyst (C 3 ) is formed ,
- the polyurethane (PUR 3 ) is selected for the liner 3 so that with the catalyst (C 3 ) introduced into the liner and remaining there metals (Me) chemically, esp. Atomic, and / or physically, esp. By Cross-linking, are bound to formed in the liner carbon chains.
- This catalyst (C 3 ) is that its organo-metal compounds are incorporated into the material of the liner in such a way that even under the action of water in the operation of the InLine meter - if at all - possibly in physiologically harmless amounts and rates of the catalyst are released from the liner.
- the primer 4 such a polyurethane (PUR 4 ), which is formed at most with the aid of a catalyst (C 4 ) which also has metal-organic compounds.
- the preparation of the primer 4 may also be based entirely on the use of a catalyst (C. 4 ) are omitted.
- the one for the polyurthane (PUR 4 ) of the primer 4 can easily be one as a third Primer-starting component serving equally potable water catalyst (C 4 ) are admixed. This may for example correspond to the catalyst (C 3 ) for the polyurethane (PUR 3 ) of the liner 3 substantially.
- the catalyst (C 3 ) used at least for the preparation of the polyurethane (PUR 3 ) of the liner 3 contains tin-organo compounds, in particular di-n-octyltin compounds, which can be ensured that the tin (Sn) introduced into the finished liner 3 via the catalyst and ultimately remaining there is chemically and / or physically bound in the liner 3 itself and, to that extent, permanently embedded therein.
- the following tin-organo compound is used as catalyst (C 3 ) for the preparation of the polyurethane (PUR 3 ) for the liner 3:
- C 3 As a particularly advantageous catalyst (C 3 ) has for the production of the liner 3, for example, di-n-octyltin dilaurate (DOTL), esp. That with the CAS no. 3648-18-8, whose structure can be represented schematically as follows:
- DNL di-n-octyltin dilaurate
- dioctyltin dimalinates or similar metal-organic compounds can be used as catalysts (C 3 ) for the production of the liner 3.
- the polyurethane (PUR 3 ) of the liner is an elastomer which is prepared on the basis of a multi-component system (A 3 + B 3 + C 3 ), which by means of a prepolymer as the first liner - Starting component (A 3 ) and one, especially di- or polyhydric, alcohol has been formed as a second liner-starting component (B 3 ) and using a serving as a third liner-starting component catalyst (C 3 ) of the aforementioned type.
- the polyurethane (PUR 3 ) for the liner 3 may be an elastomer which has at least proportionally substantially the following structure:
- At least the alcohol (B 3 ) used for the production of the liner 3 is one having at least two functional OH groups, for example a diol. Particularly good results can be achieved, for example, by using butanediol, esp. Such with the CAS no. 110-63-4, achieve.
- the alcohol for the polyurethane (PUR 3 ) of the liner 3 and / or the polyurethane (PUR 4 ) of the primes 4 is a prepolymer.
- At least the alcohol (B 4 ) used for the preparation of the primer 4 is a polyester polyol, such as Baycoll® AD 1122 or Baycoll® CD 2084 from Bayer MaterialScience AG, Leverkusen, DE, and / or a polyether polyol, such as Desmophen® 1380 BT from Bayer MaterialScience AG, Leverkusen, DE, and / or a branched, correspondingly hydroxyl-containing polyester, in particular Desmophen® 650 MPA from Bayer MaterialScience AG, Leverkusen, DE.
- a polypropylene oxide is used according to an embodiment of the invention, which is reacted with a, esp. Excess added, aromatic and / or aliphatic diisocyanate.
- a polypropylene glycol PPG is used as the polypropylene oxide, the structure of which can be simplified as follows:
- a polytetramethylene ether glycol having the following structural structure can be used to prepare at least the prepolymer (A 3 ) for the liner 3:
- an alternative or in addition-other aliphatic glycol compounds having a polymeric ether group and terminal OH groups can also be used to prepare the prepolymer serving as a liner starting component (A 3 ) or else to prepare it as a primer starting component (A 4 ) serving prepolymer.
- the diisocyanate used for the preparation of the polyurethane (PUR 3 ) for the liner 3 and / or for the preparation of the polyurethane (PUR 4 ) for the primer 4 is based on a aromatic diphenylmethane diisocyanate (MDI), in particular according to CAS No. 101-68-8 and having at least one of the following isomeric structures:
- MDI aromatic diphenylmethane diisocyanate
- Monomeric isocyanates especially those based on diphenylmethane diisocyanate, are available, for example, as Desmodur® 44 M or Desmodur® 2460 M from Bayer MaterialScience AG, Leverkusen, DE.
- Monomeric diisocyanates but also their homologs and / or corresponding prepolymers, possibly also polymers based on such diisocyanates for the preparation of the polyurethane (PUR 3 ) for the liner 3 and / or for the preparation of the polyurethane (PUR 4 ) can be used for the primer 4, in particular with the following structure: [0088]
- Prepolymers of the aforementioned type based on diphenylmethane diisocyanate (MDI) are available, for example, as Desmodur® E 23 from Bayer MaterialScience AG, Leverkusen, DE.
- IPD1 aliphatic isophorone diisocyanate
- An isophorone diisocyanate suitable in the above sense is e.g. with the IPDI Trimerista Desmodur® Z 4470 MPA / X from Bayer MaterialScience AG, Leverkusen, DE, while as hexane diisocyanate, for example, the HDI trimer Desmodur® N 3300 from Bayer MaterialScience AG, Leverkusen, DE can be used successfully.
- polyurethane (PUR 3 ) of the liner 3 and / or the polyurethane (PUR 4 ) of the primer 4 can be used.
- the polyurethane (PUR 3 ) of both the liner 3 and that of the primer 4 may be based on aromatic and / or aliphatic monomeric diisocyanates, in particular monomeric MDI, HDI, IPDI and / or TDI.
- the primer 4 For producing the primer 4, according to a development of the invention, first a flowable, in particular sprayable and / or spreadable, first multicomponent system (A 4 + B 4 ) is formed, the isocyanate (A 4 ), for example inform of diisocyanate, according to one of the aforementioned configurations, as well as di- or polyhydric alcohol (B 4 ) contains. If necessary, the first multicomponent system for accelerating the production process can also be mixed with one of the abovementioned catalysts (C 4 ) which are especially suitable for drinking water. After setting, the first multicomponent system is applied to an inner wall of serving as part of the measuring tube, esp.
- the first multicomponent system (A 4 + B 4 ) is applied to the inner wall of the support tube 2 taking into account any changes in volume such that the primer 4 finally has a thickness of less than 500 ⁇ m, in particular less than 300 ⁇ m ,
- the first still flowable second multicomponent system is applied to the formed on the inner wall of the support tube 2 primer 4 and then allowed to cure correspondingly rapidly under the action of the catalyst (C 3 ), whereby finally the liner 3 is formed in situ.
- the liquid multi-component system (A 3 + B 3 + C 3 ) can be evenly distributed over the entire inner wall in a very simple and reproducible manner ,
- the concentration and amount of the added catalyst (C 3 ) are dimensioned such that the multi-component system (A 3 + B 3 + C 3 ) applied to the carrier tube 2 provided with primer 4 is within a comparatively short time Reaction time of less than one minute, esp. Under 30 seconds, and at a processing temperature of less than 100 0 C, for example at about 25 ° C, can cure.
- Liner 3 and / or in the preparation of the polyurethane (PUR 4 ) for the primer 4 respectively used multi-component system are further stretched by means of one or more suitable, esp. Coloring and / or reinforcing fillers.
- a filler For example, it may be a reactive color or a pigment color containing or consisting of carbon particles.
- black pigment for example PRINTEX® F 80, from the company Degussa AG, Dusseldorf, DE, has proven to be very advantageous for the production of, especially drinking water, liners of the type described.
- Reactint® Black X95AB reactive dye as currently offered by Milliken Chemical, subsidiary Milliken & Company of Spartanburg, South Carolina, US, for the coloration of polyurethanes is also well established.
- carbonates esp. Calcium carbonate, silicates, such as talc, clay and / or mica, silica, calcium and.
- fillers in terms of composition and / or particle size may also possibly also a further improvement of the chemical and / or mechanical properties, such as the strength or surface hardness, etc., of the respective polyurethane ( PUR 3 ) or (PUR 4 ) can be achieved.
- the measuring tube 1 can be readily manufactured with nominal diameters in the range between 25 mm and 2000 mm. Equally, it can thus be ensured, in particular also using the above-described ribbon flow method for the production of the liner 3, that the liner 3 has a very uniform thickness of less than 8 mm, in particular less than 4 mm.
- Another advantage of the in-line measuring device according to the invention is that due to the use of a polyurethane (PUR 3 ) of the type described above for the liner 3 and a polyurethane (PUR 4 ) of the type described above for the primer 4 even for applications in the drinking water sector, especially when compared to other food applications, can meet very high hygienic requirements. Examinations have shown, for example, that the rate of migration (M max ⁇ oc) in terms of total organic carbon content (TOC) can be below 0.25 milligrams per liter per day, while the rate of chlorine depletion (M max C1 ) is well below 0.2 Milligrams per liter and day can be achieved.
- M max ⁇ oc rate of migration
- TOC total organic carbon content
- the in-line measuring device for example, the "at least for Germany relevant” guideline for hygienic Evaluation of epoxy resin coatings in contact with drinking water "to equipment in the distribution network, especially in main lines, and / or comply with the requirements of the United States relevant NSF / ANSI Standard 61 on drinking water system components requirements comply with the requirements of the UK drinking water authorization regulation "Water Regulation Advisory Scheme BS 9620" and / or France "Dossier de Demande d'Acs pour Accesoires.”
- In-line gauges according to the invention with a polyurethane liner can thus quite traditionally used in the drinking water area or provided for in-line measuring instruments of the type described with comparatively expensive liner of PFA, PTFE, hard rubber or the like.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Polyurethanes Or Polyureas (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200610026310 DE102006026310A1 (de) | 2006-06-02 | 2006-06-02 | In-Line-Meßgerät mit einem innen mit Polyurethan ausgekleidetem Meßrohr und Verfahren zu dessen Herstellung |
PCT/EP2007/055362 WO2007141194A1 (de) | 2006-06-02 | 2007-05-31 | In-line-messgerät mit einem innen mit polyurethan ausgekleidetem messrohr und verfahren zu dessen herstellung |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2024713A1 true EP2024713A1 (de) | 2009-02-18 |
Family
ID=38347457
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07729763A Withdrawn EP2024713A1 (de) | 2006-06-02 | 2007-05-31 | In-line-messgerät mit einem innen mit polyurethan ausgekleidetem messrohr und verfahren zu dessen herstellung |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2024713A1 (de) |
CN (1) | CN101490512B (de) |
DE (1) | DE102006026310A1 (de) |
RU (1) | RU2429451C2 (de) |
WO (1) | WO2007141194A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008056871A1 (de) * | 2008-11-12 | 2010-06-10 | Abb Technology Ag | Durchflussmessgerät |
DE102008059067A1 (de) | 2008-11-26 | 2010-06-02 | Krohne Ag | Magnetisch-induktives Durchflußmeßgerät |
DE102012112388A1 (de) | 2012-12-17 | 2014-07-03 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Induktiver Leitfähigkeitssensor und Verfahren zu dessen Herstellung |
DE102014114941A1 (de) * | 2014-10-15 | 2016-04-21 | Endress + Hauser Gmbh + Co. Kg | Hybrid-Flansch |
CN109682431B (zh) * | 2017-10-18 | 2020-12-29 | 桓达科技股份有限公司 | 电磁式流量计的安全设计方法 |
FR3092010B1 (fr) * | 2019-01-25 | 2021-01-22 | Zodiac Fluid Equipment | Tête magnétique pour détecteur magnétique de particules métalliques et détecteur magnétique pourvu d'une telle tête. |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3011510A1 (de) * | 1980-03-25 | 1981-10-15 | Fischer & Porter GmbH, 3400 Göttingen | Induktive durchflussmesseinrichtung |
US4774844A (en) * | 1987-06-25 | 1988-10-04 | Fischer & Porter Co. | Encapsulated electromagnetic flowmeter |
US5155201A (en) * | 1989-07-13 | 1992-10-13 | Akzo N.V. | Polyurethane polyols and high solids coatings therefrom |
JPH05220451A (ja) * | 1992-02-14 | 1993-08-31 | Dainippon Ink & Chem Inc | ウレタンエラストマーの金属管または金属バルブへのライニング方法 |
CN2157383Y (zh) * | 1993-06-18 | 1994-02-23 | 中国人民解放军总后勤部油料研究所 | 一种软质输油管 |
JP3662312B2 (ja) * | 1995-10-27 | 2005-06-22 | 株式会社山武 | 電磁流量計 |
EP1178080B1 (de) * | 2000-07-19 | 2007-04-25 | Nippon Shokubai Co., Ltd. | Härtbare Harz- und Beschichtungszusammensetzung |
ES2283434T3 (es) * | 2000-09-22 | 2007-11-01 | Ppg Industries Ohio, Inc. | Poliuretanos curables, recubrimientos preparados a partir de ellos y metodo para su fabricacion. |
CN2669143Y (zh) * | 2003-11-27 | 2005-01-05 | 吴天侠 | 具有导管与衬里可密封结合的电磁流量计的测量管 |
DE10358268A1 (de) * | 2003-12-11 | 2005-07-21 | Endress + Hauser Process Solutions Ag | Magnetisch-induktiver Durchflußaufnehmer und Verfahren zu dessen Herstellung |
DE102004047921A1 (de) * | 2004-10-01 | 2006-04-06 | Bayer Materialscience Ag | Polyisocyanate mit sterisch anspruchsvollen Phenolen blockiert |
DE102004062680A1 (de) * | 2004-12-21 | 2006-06-22 | Endress + Hauser Flowtec Ag | In-Line-Meßgerät mit einem Meßrohr und Verfahren zu dessen Herstellung |
-
2006
- 2006-06-02 DE DE200610026310 patent/DE102006026310A1/de not_active Withdrawn
-
2007
- 2007-05-31 EP EP07729763A patent/EP2024713A1/de not_active Withdrawn
- 2007-05-31 WO PCT/EP2007/055362 patent/WO2007141194A1/de active Application Filing
- 2007-05-31 CN CN2007800272983A patent/CN101490512B/zh active Active
- 2007-05-31 RU RU2008152027/28A patent/RU2429451C2/ru active
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO2007141194A1 * |
Also Published As
Publication number | Publication date |
---|---|
RU2429451C2 (ru) | 2011-09-20 |
DE102006026310A1 (de) | 2007-12-06 |
WO2007141194A1 (de) | 2007-12-13 |
RU2008152027A (ru) | 2010-07-20 |
CN101490512B (zh) | 2011-12-14 |
CN101490512A (zh) | 2009-07-22 |
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