DE2448301A1 - Electrostatic powder spraying for pre-heated metal tubes - pipes are temporarily heated about three hundred degrees C - Google Patents
Electrostatic powder spraying for pre-heated metal tubes - pipes are temporarily heated about three hundred degrees CInfo
- Publication number
- DE2448301A1 DE2448301A1 DE19742448301 DE2448301A DE2448301A1 DE 2448301 A1 DE2448301 A1 DE 2448301A1 DE 19742448301 DE19742448301 DE 19742448301 DE 2448301 A DE2448301 A DE 2448301A DE 2448301 A1 DE2448301 A1 DE 2448301A1
- Authority
- DE
- Germany
- Prior art keywords
- heated
- temperature
- metal tubes
- pipes
- powder spraying
- 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- Withdrawn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
- 239000002184 metal Substances 0.000 title claims abstract description 5
- 239000000843 powder Substances 0.000 title description 8
- 238000005507 spraying Methods 0.000 title description 2
- 238000007590 electrostatic spraying Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 239000003822 epoxy resin Substances 0.000 description 5
- 229920000647 polyepoxide Polymers 0.000 description 5
- 239000004033 plastic Substances 0.000 description 4
- 239000000057 synthetic resin Substances 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000006223 plastic coating Substances 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
- B05D7/146—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies to metallic pipes or tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
- B05D1/06—Applying particulate materials
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2350/00—Pretreatment of the substrate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0218—Pretreatment, e.g. heating the substrate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0433—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being a reactive gas
- B05D3/044—Pretreatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
- B05D3/102—Pretreatment of metallic substrates
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
"Verfahren zum elektrostatischen Aufsprühen pulverförmiger Stoffe auf vorerhitzte Rohre aus Metall" Die Erfindung betrifft ein Verfahren zum elektrostatischen Aufsprühen pulverförmiger Stoffe auf vorerhitzte Rohre aus Metall."Process for the electrostatic spraying of powdery substances on preheated tubes of metal "The invention relates to a method for electrostatic Spraying powdery substances onto preheated metal tubes.
Das elektrostatische Pulverspritzverfahren ist ein Oberflächenschutzverfahren, bei dem das Kunstharzpulver, z.B. Epoxidharzpulver, auf das vorgewärmte Rohr aufgeschmolzen wird und thermisch aushärtet. Dabei wird auf das über die Schmelztemperatur des Kunstharzpulvers erwärmte Rohr z.B. das Epoxidharzpulver aufgespritzt, das bei pneumatischer Förderung in einer Spritzeinheit elektrostatisch aufgeladen wird. Zwischen den elektrostatisch negativ aufgeladenen Epoxidharzteilchen und dem positiv (geerdet) aufgeladenen Rohr entsteht ein starkes Magnetfeld.The electrostatic powder spraying process is a surface protection process, in which the synthetic resin powder, e.g. epoxy resin powder, is melted onto the preheated pipe and thermally cures. It is based on the melting temperature of the Synthetic resin powder heated tube e.g. the epoxy resin powder sprayed on, which is the case with pneumatic Promotion in an injection unit is electrostatically charged. Between the electrostatic negatively charged epoxy resin particles and the positively (grounded) charged tube creates a strong magnetic field.
Entsprechend dem Verlauf der magnetischen Feldlinien werden die Epoxidharzpulverteiloben in gleichmäßiger Schichtdicke auf die Oberfläche des Rohres verteilt und bleiben aufgrund ihrer unterschiedlichen Ladung zum Stahlrohr fest haften.According to the course of the magnetic field lines, the epoxy resin powder is distributed on top Distributed in an even layer thickness on the surface of the pipe and remain due to their different charge to the steel pipe adhere firmly.
Für den Korrosionsschutz eines Stahlrohres durch eine Kunststoffbeschichtung ist nicht die Dicke der Kunststoffschicht, sondern die Qualität der Haftung des Kunststoffes auf dem Stahlrohr entscheidend. Eingehende Versuche haben gezeigt, daß die wesentlichen Einflußgrößen für eine gute IIaftung in der Beschichtungs temperatur des Werkstückes, der Schmelztemperatur des Kunstharzpulvers, der Viskosität der Kunstharz-Schmelze und in der Ansprechtemperatur des Härters zu sehen sind.For the corrosion protection of a steel pipe with a plastic coating is not the thickness of the plastic layer, but the quality of the adhesion of the The plastic on the steel pipe. In-depth tests have shown that the essential factors influencing good adhesion in the coating temperature of the workpiece, the melting temperature of the synthetic resin powder, the viscosity of the Resin melt and the response temperature of the hardener can be seen.
In der Fachwelt wird bisher die Meinung vertreten, die Deschichtungstemperatur bei Verwendung von Epoxidharz liege in der Größenordnung von 230 bis 2600 C, vorzugsweise bei etwa 2450 O (siehe z.B. DT-OS 2 256 865). Auch in der '2SPECIFICATION O PLANT APPLICATION OF Scotchkote No. 204 PRIME SYSTEM TO LINE l'Il'l" bzw. No. 206 PIPELINE COATING TO LINE PIPE" werden Beschichtungstemperaturen von 2180 C bis 2440 C genannt. In dieser Publikation wird noch ausdrücklich darauf hingewiesen, daß eine Oxydation des zu beschichtenden Stahls unter allen Umständen zu vermeiden ist (siehe Ziffer 3.1 der Veröffentlilung).In the professional world, the opinion has been held so far, the coating temperature if epoxy resin is used, it is in the order of magnitude from 230 to 2600 ° C., preferably at around 2450 O (see e.g. DT-OS 2 256 865). Also in the '2SPECIFICATION O PLANT APPLICATION OF Scotchkote No. 204 PRIME SYSTEM TO LINE l'Il'l "or No. 206 PIPELINE COATING TO LINE PIPE "are called coating temperatures of 2180 C to 2440 C. In this publication it is expressly pointed out that oxidation of the steel to be coated must be avoided under all circumstances (see section 3.1 of the publication).
Der Erfindung liegt die Aufgabe zugrunde, das eingangs beschriebene Verfahren so zu verbessern, daß eine noch bessere haftung zwischen Kunststoff und Stahl erreicht wird.The invention is based on the object described at the outset Process to improve so that an even better adhesion between plastic and Steel is achieved.
Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß die Beschichtungsfläche der Rohre kurzzeitig auf eine Oberflächentemperatur von 280 - 3800 C vorerhitzt wird, die zur Ausbildung einer etwa molekular dicken Oxydschicht ausreicht.This object is achieved according to the invention in that the coating surface the pipes are briefly preheated to a surface temperature of 280 - 3800 C. which is sufficient to form an approximately molecularly thick oxide layer.
Als Beschichtungstemperatur gilt die Temperatur, die über die ganze Wanddicke des Rohres gleich ist und nach dem Vorwärmen durch eine Temperaturausgleichszeit eingestellt wird. Durch dic nachgeschaltete Ausgleichszeit ist es möglich, beim Aufheizen kurzzeitig eine Oberflächentemperatur von etwa 3800 C zu erreichten.The coating temperature is the temperature over the whole Wall thickness of the pipe is the same and after preheating through a temperature equalization time is set. Due to the subsequent equalization time, it is possible when Briefly heat up to reach a surface temperature of around 3800 C.
Erfolgt die Aufheizung mit Gasbrennern, so werden diese mit Luftüberschuß und heißer Flamme gefahren. Bei Erreichen der genannten Temperatur entsteht eine etwa molekular dicke KeO-Schicht, die durch eine entsprechende Anlauffarbe erkenntlich ist, Umfangreiche Versuche haben ergeben, daß eine derart ausgebildete FeO-Schicht zu einer hervorragenden Bindung der später aufgesprühten Kunststoffschicht führt. Das neue Verfahren steht im Widerspruch zur bisher vertretenen Auffassung der Fachwelt, wonach Aufheiztemperaturen von ca. 2.600 C nicht überschritten werden dürfen. Die mit dem neuen Verfahren erzielten positiven Ergebnisse sind daher für die Fachwelt auch überraschend. Dem neuen Verfahren kommt eine große wirtschaftliche Bedeutung zu. Langfritige Versuche haben gezeigt, daß die Anforderung an die Beschichtung zum Schutze von Stahlrohren bei der Verlegung im Erdreich erfüllt werden. Dies gilt sowohl hinsichtlich der mechanischen Festigkeiten für Beanspruchungen auf dem Transport und auf der Bausteile, als auch beim Widerstand gegen korrosive Angriffe. Bei Anwendung des neuen Verfahrens dürfte es nunmehr erstmals möglich sein,entsprechend beschichtete,im Erdreich verlegte Stahlrohre zum Wärmetransport bis zu Temperaturen von 1300 C über große Entfernungen einzusetzen.If the heating is carried out with gas burners, these will be with excess air and driven with a hot flame. When the temperature mentioned is reached, a Molecularly thick KeO layer, which can be recognized by a corresponding tarnish color is, Extensive tests have shown that such a formed FeO layer leads to excellent bonding of the later sprayed-on plastic layer. The new procedure is in contradiction to the opinion held up to now by experts, according to which heating temperatures of approx. 2,600 C must not be exceeded. the The positive results achieved with the new process are therefore useful to experts also surprising. The new process is of great economic importance to. Long-term tests have shown that the requirements on the coating to protect steel pipes when laying in the ground. this applies both in terms of mechanical strength for stresses during transport and on the components, as well as resisting corrosive attacks. When applied of the new process, it should now be possible for the first time, appropriately coated, im Steel pipes laid underground for heat transport up to temperatures of 1300 C above to use great distances.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19742448301 DE2448301B2 (en) | 1974-10-10 | 1974-10-10 | METHOD OF ELECTROSTATIC SPRAYING OF POWDERED SYNTHETIC RESINS ON PREHEATED METAL PIPES |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19742448301 DE2448301B2 (en) | 1974-10-10 | 1974-10-10 | METHOD OF ELECTROSTATIC SPRAYING OF POWDERED SYNTHETIC RESINS ON PREHEATED METAL PIPES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE2448301A1 true DE2448301A1 (en) | 1976-04-22 |
| DE2448301B2 DE2448301B2 (en) | 1976-11-25 |
Family
ID=5927980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19742448301 Withdrawn DE2448301B2 (en) | 1974-10-10 | 1974-10-10 | METHOD OF ELECTROSTATIC SPRAYING OF POWDERED SYNTHETIC RESINS ON PREHEATED METAL PIPES |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE2448301B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105344508A (en) * | 2015-10-26 | 2016-02-24 | 南京万德游乐设备有限公司 | Powder spray process for fitness equipment |
-
1974
- 1974-10-10 DE DE19742448301 patent/DE2448301B2/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105344508A (en) * | 2015-10-26 | 2016-02-24 | 南京万德游乐设备有限公司 | Powder spray process for fitness equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2448301B2 (en) | 1976-11-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| BHN | Withdrawal |