POLYAMIDE COATING POWDER WITH SMALL PARTICLE SIZE TO PROVIDE VERY THIN AND HOMOGENEOUS COATING, AS COMPARED TO THE FILM MADE OF CONVENTIONAL POLYAMIDE COATING POWDER
Also Figure 1 shows a system for coating a metal pipe conventional. timing. Fluidized bed the coating process in a specially developed for, nylon 11 and a nylon 12 polyamide on the basis of average particle diameter DIN EN ISO 4610 according to powder is generally (d50) is 95 to 120 micro m is. Generally they are DIN 53 466 according to bulk density is 400 to 600 grams per litro. Powder containing a particulate corresponding crushing or grinding precipitated from polyamide is supplied as powder. Such as call number DE 29 06 647 B1, grinding powder (mill) mill making and as particulate material precipitated powder solvent dissolve and precipitate oxide is produced by. As a result of precipitation the precipitation granule form circular provides polyamide powder having. Precipitated powder although the powder grinding unlike a shock wave to the material has particles. Precipitated nylon 12 [...] bath examples of powder (VESTOSINTR) 1101, 1111, 1121, 1141 and 1161 [manufacturer: free useoh to (Degussa AG)] and flow coating for glass, is improved in the wettability examples of nylon 11 powder (RilsanR) 7050 white, gray and white PT 7050 T 7280 is [manufacturer: atto blood or (Atofina)]. In fluidized bed the coating process, high temperature metal component fluidize a fan having an the polymer powder in a chamber with to immersed into (pan). Wherein, high temperature powder and sintered is adhesion on metallic surfaces provides homogeneous coating. The whole process for the same temperature of a metal surface from exceeding a melting point of the polymer powder is. Typically, fluidized bed the coating process the thickness of the coating polyamide in 200 to 500 micro m or, in certain cases, , is about 1000 micro m hereinafter. About 200 micro m thinner than layer is typically flow coating powder produced a fluid the coating process unpredictable, or is very difficult to. In coating technique, typically a polyamide commercially available when the production of layers using powder coating flow, flocculation property smooth and the thickness of the film of a powder d50 of 2 times larger than the knows experience as a matter of and have to be. Of powder coating flow commercially d50 since the 95 to 120 micro m, as a result in the film thickness, resulting in a lower limit of m is about 200 micro. It that is difficult low film thickness than an immersion time and temperature of object do. On the other hand, on the surface film thickness in order to avoid the LED to excessive growth of an immersion only briefly to induce the can but to high temperature object, not covered with hand so as not to region both and an edge-edge of corresponding applied if it has to handle, bath powder codes out specific minimum in time as large as that of immersion time is required. Therefore, 50 to 200 micro m in the case of coating thin, fluidized bed the coating process are often used which is method other than, for example, ES spraying, high temperature spraying, tree purpose is (minicoating) coating method and mini (tribo spraying) spraying. Like K mini coating method. accumulated first images is most similar to the coating process. However, the method at a high temperature which an upper part is closed and on polyamide powder, which has not been employed in flow into the. The polymers metal parts sufficient energy melting of the material is represented by the long as. that has been applied as a powder. Metal parts slightly sintered powder adhesion is homogeneous providing a layer of has enough heat to result, and is formed in an inhomogeneous shift operation mode initially. When surfaces to the desired homogeneous which has a flat and smooth, following heating in an oven is attained by irradiating with heat source can be achieved. The method allows a small lightweight metal parts, for example, is carried out by using an acidulous specifically for clip corset. Examples of conventional mini coating powder [...] bath 2157 and 1164, 1174, is improved in the wettability and and 1452 MAC [manufacturer: free useoh to ] is [manufacturer: atto blood or ]. Mean particle size of these powders (d50) generally 20 to 70 micro m is. Mini coating powder the bulk density of the bulk density of powder coating flow typically slightly smaller than the inside.. Zeroknowledge in general is 300 to 350 grams per litro. The conventional mini coating powder flows in a specific flow coating powder, significantly poor fluidized properties the planar sheet to exhibit a, their bulk density their into smaller one while is since more fine particles. Coating powder and mini a fine powder commercially available conventional are potentially useful in the in a fluidized bed the coating process is limited. However, flow coating process, the thin layer of 50 to 200 micro m for achieving polyamide powder a request for is increased and the. Relate use of this type, for example, American patent number 6,276,400 as is described in, in the automotive industry, is described for preventing corrosion of metal pipe is chromium free coating. American such as call patent number 6,276,400, in the case of a continuous pipe coating, conventional mini. undesirable coating method. The method requires a flow coating fan, fan coating flow pipe passing. pulled continuous. In the method, preferably of induction of the polymer a pipe temperatures that exceed the melting point is heated locally. Pipe of this type in the automotive industry, is described layers thicknesses and the coating process using a homogeneous coating requiring strict requirement and.. While, layer thickness on the measured weight should be as low as possible to reduce the however, in safety polyamide layer contains at hand the important parts (brake pipe, fuel pipe) as action preventing corrosion in, any deficiency in mechanical properties must not local or.. Therefore, the present purpose of the invention which is to be used in coating flow of thin layers comprising at least a highly homogeneous thin film a polyamide flow coating powder is to develop an.. Surprisingly the present invention and begin to, using polyamide powder of the present invention this purpose and a flow coating process highly homogeneous of 50 to 200 micro m capable of producing a layer thickness been found to. Unlike powder coating flow commercially, has substances and particles are polyamide powder of the present invention, is a mini particle size of. similar to the particle size of coating powder. Average particle diameter of powder of the present invention (d50) micro m is the 20 to 90. Is m micro 125 6a. particle size. Such considerably lower pressure angles, i.e., the case of a small grain size less than 200 micro m. film homogeneous resilient elasticity after. Nevertheless, excellent powder fluidized characteristics in order to have, has particular characteristics and powder of the present invention. Conventional mini unlike powder industrial microdeposition powder and coated zinc coating, extreme powder of the present invention to be free from the generation of particulate (extreme fine), a fine particle content less than 5 micro m less than 1%. A further property is the of powder of the present invention in particular to the typical circular, in the form of particles, is. greatly improve properties balance of. Three of the particles powder of the present invention space base x, both z y and identical dimensions to within ± 10% has a substantially spherical particles content of a exceeds 75%. Powder is preferably of the present invention space base of three particles x, both z y and identical dimensions to within ± 10% has a substantially spherical particles content of a exceeds 80%. Laser diffraction DIN EN ISO 4610 according to particle size distribution by [ end time (Malvern)], granular form modern Image evaluation system (modern image evaluation system) and ., determined by means of scanning electron microscope. Of the present invention such as call number DE 29 06 647 B1 powder is preferably precipitated powder generated. The method provided by conventional a starting material is circular original than powder grinding. Conventional the particular characteristic of the powder of the present invention particles in complete grinding/collapse or bush housing a but remains edge edge and a slow speed operations mill (slow-running mill) or certain impact device that is required as edge and as a mechanical post-processing is bush housing edge. In particular powder and uniformly easy in order adhesion viscosity polyamide powder is used it is preferable that the. Relative powder EN ISO 307 according to of the present invention viscosity solution (ηrel) the 1.30 to 1.65, preferably is 1.40 to 1.63. Is fused powder fluidized bed thin in order to improve the flow behaviour when, group containing amino end group and/or carboxy group containing (regulator) by the application of a modifier which the objective compound. delay after condensation. The, for example, dicarboxylic acid or a can be ethylenediamine is. According to modulators, carboxy group and amino end group between terminal groups on a desired ratios of at least 3:1 or 1:3 hereinafter. (Flowability) fluidity of powder of the present invention-fluidized or through the additive (fluidizability) can be optimized for. Inorganic a is can be additive. The commercially available e.g. the titanium dioxide, aluminum oxide and. positive photosensitive anionic particulate silica, a. The polyamide powder of the present invention used in the coating process fluidized bed thin in particular. System for coating a metal pipe conventional disclosed is below the. A fluidized bed is publicly known the polyamide powder of the present invention using the coating process may be applied in.. Below the fluidized bed the disclosed system then perfluoropolyethers chromate by the coating process finds suitable application in particular for coating. the system automatically and flow coating by. acts to outer skin pipe. In components such as a this consists of: 1) typically oil contaminated pipe for cleaning treatment system, 2) steel surfaces and a polymer between the primer for applying a fixing agent (fixing number) fan (atomizing system or immersion system), 3) primer for baking, and when used in the primer containing solvent, evaporating a solvent for medium frequency (medium-frequency) induction coil (1), 4) evaporator faster of solvents (radial fan) type blower for divergence, 5) induction coil medium frequency for pre-heating pipe (2), 6) an integrated application of coating medium frequency induction coil (3) which has a flow coating fan (steel pipe that has been preheated, which pass through the system very rapidly but is heated to a temperature, a coating of the photocatalytically-activated self-insulating loss coefficient. is too low for is heated. Flow coating for controlling the thickness of a layer during deterministic factors is preheating temperature and an immersion time. When passes through the system pipe is, the layer thickness of power plant simulator and pipe of forward speed is controlled by a. means that they can be. Both from a control desk can be controlled independently of each other.), 7) powder in order to prevent accumulation and flushing system air is installed on pipe, and lack powder which is produced by a downward the portion for preventing the creation of provided on the under the pipe, of a metal flow guide panel consisting of a fluidized bed coating the case (only specific by using the inside radially and axially both uniform layer thickness be ensured..), 8) capable of smoothing a polyamide layer contains at molten incomplete for medium frequency induction coil (4), 9) pipe is medium frequency induction coil (4) adhesion to polyamide attachments after being discharged from the smoothing sufficiently to melt the required melt zone (system through polyamide layer contains at high temperature is still in soft, can be readily damaged. Therefore, roller a pipe passing the processes for preparing the step't acceptable.), 10) pipe surface-pre-cooler for air flushing system (the pipe surface temperature below the melting point of polyamide a controlled), 11) aqueous cooling system (pipe is neck part thereby to block the movement of the, polyamide layer on to cool and is cured and the, thus. also pass to roller here). 5, 6 and 8 of the induction coil are desired a polyamide a layer thickness required is use if the. The availability induction coil 8 and a 5 ; 6 and a 5 ; 5, 6 and 8 ; 6 ; and 6 and is 8. medium frequency pipe is heated by induction. The method using a desired length of pipe coupled together zone continuous line passes horizontally through system provided a method by which is coated on the outer polymer powder can be to. Homogeneous layer thickness distribution for coating external pipe 120 to 180 micro m, is m micro 150 preferably. Number fixing and a method of manufacturing the commercially available [e.g.: bath [...] number WS 5 fixing (VESTOSINT)] are formed of pipe of applying said composition to the surface.. Air drying the thickness of the primer then micro m is 5 to 8. Is composition solids acid concentration in the range of about 8%. A, and pipe manufactured by of the present invention method, for example, brake pipe or hydraulic in the automotive industry, is described in particular as containment pipes finds suitable application. Then powder embodiment of the present invention relate, manufacturing method thereof describes further and use, these embodiment to exemplify limited not. In the embodiment 1: A for manufacturing powder of the present invention: Controlled behavior of flow using a dicarboxylic acid is prepared amino terminal groups on content is l/40mmol and 180 μmol carboxy terminal groups on content ηrel is 1.55 in granular nylon 12 a high temperature such as call number DE 29 06 647 to precipitate from alcohol. Precipitated powder average particle size (d50) micro 61 is m x space base of three particles and, to within ± 10% both y and z-shaped particles having identical dimensions is the ratio of 70%. 2157 [...] bath powder crude generated conventional processing modules, such as the commercially available in fine polyamide powder and bonding pads.. Further operations take in, 125 micro m through a screen the jaw powder grains exceeding particles are removed and an high impact fan mill [Hybridizer, NARA] in postprocess 10 minutes. Furthermore, air classification (pneumatic classifier) to a processor applies a process, which extreme powder. microparticles removed therefrom. 5 the ratio of micro particulate extreme less than m is 0.1%. Average particle size of powder generated (d50) the 52 micro x axis of three particles and m, both z y and identical dimensions to within ± 10% -shaped particles having the ratio of is 84%. A 380 grams per litro is the bulk density of powder. Powder, polyamide powder 100 based on the portion, frame black (flame black) 1.0 and fine particulate silica (aerogel chamber 200) 0.05 to treating a. Coating test In the embodiment 1 obtained from powder for determining the power distribution in pipe passing through the metal induction heating based on a. and processed into a test system. For comparison a plurality of the commercially available polyamide powder (won commercially available: free useoh to) use an. 1111 [...] bath they are black (commercially flow coating powder), white 1174 [...] bath (mini including titanium dioxide coating powder) and bath [...] 2157 black (in particular coil coating used in a fine powder) is. 1 table result. based on. Number WS 5 fixing [...] bath both pipe (won commercially available: free useoh to) to and to pre-process the layer is micro m and a thickness of from about 5. On a metal pipe, said polyamide powder of the present invention highly homogeneous films the coating track quality quality of powder coating flow of the existing method. similar to. In fluidized and dusting, with a relatively good powder exhibits size and excellent mechanical properties. The polyamide powder of the present invention the aim of less than 200 micro m a polyamide layer thickness can be achieved. 120 micro m of satisfied polyamide layer thickness of deficiency without test can be achieved a reproducible manner. In contrast, the production of layers using powder coating flow commercially similar emission control that can be achieved quality in which a coating layer thickness exceeds 200 micro m a. Conventional commercially a mini coating powder and conventional commercially available significantly compared to the a fine powder fluidized poor fluidized characteristic and exhibits Mangan crosslinking region such as fan. Respect to test system 120 to 130 micro m for flocculation property of layer is achieved but, they are mainly than poor fluidized behavior exhibits heterogeneous characteristic coating is sufficiently higher result. Radially layer thickness difference is measured may evaluated to electrophotographic and the cross sectional area of. Flow coating process according to the present invention a polyamide powder is characterized in that surface area polyamide coating by polyamide powder of prior art electrode is welded in one side of film thickness thin thin coating can be provided. PURPOSE: A polyamide coating powder with a small particle size is provided to achieve very thin and homogeneous coating on a metal pipe by using a fluidized bed coating method. CONSTITUTION: The polyamide coating powder has an average particle size(d50) of 20-90 micrometers, and comprises less than 1% of particles with the size of 5 micrometers or less and 75% or more of spherical particles of which three axes x, y and z are within the range of ±10%. The polyamide is selected from Nylon 11 and Nylon 12. © KIPO 2005 Average particle size (d50) is 20 to 90 micro m and 5 m micro particulate content of less than 1% less than x axis of three particles, z y and both having identical dimensions to within ± 10% -shaped particles is 75% or more, fluidized bed the coating process unit or for coating polyamide powder. In Claim 1, x axis of three particles, z y and both having identical dimensions to within ± 10% -shaped particles is 80% or more polyamide powder. According to Claim 1, nylon 12 and a nylon 11 a polyamide selected from the group consisting of including polyamide powder. according to any one of Claim 1 to Claim 3, ηrel is 1.30 to 1.65 in polyamide powder. according to any one of Claim 1 to Claim 4, ηrel is 1.40 to 1.63 in polyamide powder. According to any one of Claim 1 to Claim 5, polyamide powder is flow behaviour controlled group and carboxy terminal groups on amino end group ratio of 3:1 or more, or 1:3 hereinafter a polyamide powder. Fluidized bed the coating process is then generated by along the in claim number 1 a film which based on polyamide powder, polyamide layer thickness of 50 to 200 micro m in coating. Product d50 [micro m] 5 micro m extreme of less than of fines content [%] The ratio of particles spherical [%] Required is reduced and the need for pipe on polyamide layer thickness [micro m] Maximum radially polyamide layer thickness difference [micro m] Dusting Fluidized Polyamide powder A 52 0.1 84 120 5 less than 5 less than 1 to 2 2157 [...] bath 57 0.5 About 70 120 10 10 3 1111 [...] bath 100 0.1 About 65 200 5 less than 5 less than 1 1174 [...] bath 40 8 About 70 130 20 15 exceeds 5