Method of using fluoropolymer powder coating as ground coating and coating

FIELD: chemistry.

SUBSTANCE: invention relates to formation of a surface with prolonged anti-adhesion capacity using fluoropolymer resins. Described is a method of obtaining an anti-adhesion surface on a substrate involving (a) depositing a ground coating, obtained through spray drying onto the said substrate, (b) depositing a powder coating onto the obtained ground coating layer to form a coating layer on the said ground coating layer, where the said ground coating contains tetrafluoroethylene/perfluoroolefin copolymer, where the perfluoroolefin contains 3-8 carbon atoms, and a polymer binding substance selected from a group of polyestersulphones, polyphenylenesulphides and polyarylene esterketones, and said coating contains a copolymer of tetrafluoroethylene/perfluoro(alkylvinyl ether); (c) sintering said ground coating and said coating layer to form an anti-adhesion surface. Described also is a substrate obtained using said method. The adhesion quality is determined by a peel test after boiling in water.

EFFECT: method provides excellent and longer adhesion of the coating system with the substrate.

19 cl, 8 tbl, 7 ex

The technical FIELD TO WHICH the INVENTION RELATES.

This invention relates to the field of surface formation with long-term anti-adhesive ability by applying priming powder on the substrate with the formation of it fluoropolymer primer and application of the fluoropolymer powder in the primer layer with the formation of the coating. In particular, this invention is directed to selection of fluoropolymer powder to the primer, which get good adhesion of the intermediate layer with a coating of a powder of a copolymer of a tetrafluoroethylene/perfluoroalkyl vinyl ether, and persists for a long relationship with the substrate.

BACKGROUND of INVENTION

Fluoropolymer resin having such properties, good chemical resistance, excellent anti-adhesive properties, good heat resistance and good electrical insulating properties, is desirable in some applications. Fluoropolymer powders, which are fluid when melted, as found suitable for the coating for cooking, such as rice cookers, grills and ovens, as well as for numerous applications in industry, such as for heat setting rollers or belts for copiers and printing devices (printers) and reactors for chemical the technological processes. One of the advantages of powder coating instead of the coating liquid is that excluded the stages of drying and aeration used when applying liquid coatings, and equipment associated with the application of liquid coatings. In addition, for powder coating does not require the use of volatile organic solvents that pollute the environment and cause costly procedures for its protection.

Powder coating for both the primer and the coating described in U.S. patent No. 5093403, Rau et al. In this patent PerformancePoint (APF) cited as an example of how the primer and coating. In this patent it is established that it is difficult to associate the PFA resin to the metal substrate and that the APF should be applied at relatively high temperatures, i.e. in the range from about 675°F to about 720°F (357-382°C). Rau et al. describe the use of bonding agents, such as poly(phenylindole) (SFC), with the binding resin of the APF with the metal substrate at these elevated temperatures without any significant deterioration (destruction) of the APF.

Due to the high operating temperature, good abrasion resistance and excellent anti-adhesion properties of the APF is the preferred resin for surfaces, use is utilized in industrial applications in harsh environments, such as for anti-adhesive surfaces for industrial heat-resistant products. Industrial baking trays are numerous temperature cycles every day and must retain its adhesive properties during periods of considerable duration, to make industrial production baking economical. However, experience has shown that the coating of the APF the APF primer leads to inadequate adhesion of the system over time. As a result the system APF/APF, which is described in Ru et al., may break down too quickly and not sufficiently meet the requirements of industrial process in which substrates with anti-adhesive surfaces are subjected to thousands of cycles baking in the year.

Thus, remains a need for improved compositions of powder primer that can be used with the upper surface of the APF, which gives the possibility of obtaining system primer/top cover, which can be used at high operating temperatures, with improved adhesion and longer life while maintaining good release properties and abrasion resistance.

SUMMARY of INVENTION

It has been unexpectedly discovered that the use of a tetrafluoroethylene/perforating copolymer applied in the when asked priming powder in combination with a powder coating tetrafluoroethylene/PERFLUORO(vinylalcohol simple ether) copolymer, also known as PerformancePoint (APF), when it is sintered at a certain substrate, gives a superior and longer lasting adhesion of the coating system to the substrate. The quality of adhesion is quantified by the test exfoliation boiling water.

In addition, the system of the present invention, which uses the APF in the upper floor, gives the advantage of a known good release properties, abrasion resistance and high operating temperature of the APF in this layer.

Therefore, this invention creates a method of forming a release surface on a substrate, comprising (a) applying priming powder on the substrate with the formation of primer on it, (b) applying the coating powder in the primer layer with the formation of the coating layer on the primer layer, and a primer coating contains a tetrafluoroethylene/perforreviews copolymer and a polymer binder, and the coating includes a copolymer of tetrafluoroethylene/PERFLUORO(alkylvinyl simple ether), (C) sintering the primer layer and top coating with the formation of anti-adhesive surface. Powder layers are preferably applied by electrostatic spraying. The polymer binder is preferably selected from the group consisting of polyethersulfones, politi is esculpido and polyaryleneethersulphones. In one of the embodiments of the priming powder comprising tetrafluoroethylene/perforreviews copolymer, in addition, includes a copolymer of tetrafluoroethylene/PERFLUORO(alkylvinyl simple ether).

A DETAILED DESCRIPTION of the PREFERRED EMBODIMENTS

In accordance with this invention offered a method of forming a release surface on the substrate. This method includes the stage of applying priming powder comprising tetrafluoroethylene/perforreviews copolymer and a polymeric binder on the substrate with the formation thereon of the primer and the powder coating containing a copolymer of a tetrafluoroethylene/PERFLUORO(alkylvinyl simple ether) on the primer layer with the formation therein of the upper layer of the coating. The primer layer and the coating layer is sintered with the formation of anti-adhesive surface on the substrate.

Fluoropolymers

The fluoropolymers used in the primer layer and the coating of this invention are fluid during melting. Typically, the viscosity of the melts will be in the range of 10²PA·s to about 10⁶PA·s, preferably between 10³up to about 10⁵PA·s, measured at 372°C. by the method S D-1238 modified as described in U.S. patent 4380618, and S D-2116 or D-3307, depending on the copolymer is. Examples of such fluid in the melt fluoropolymers include copolymers of tetrafluoroethylene (TPV) and at least one fluorinated copolymerizing monomer (comonomer)present in the polymer in a quantity sufficient to reduce the melting temperature of the copolymer is essentially below the melting temperature of the TPV homopolymer, polytetrafluoroethylene (PTFE), for example, to the melting temperature of not more than 315°C.

Priming powder used in this invention contains a copolymer of tetrafluoroethylene (TPV) and a perfluoroolefin and perforreviews comonomer preferably has from 3 to 8 carbon atoms, such as HEXAFLUOROPROPYLENE (HFP). In one of the embodiments of the priming powder containing a copolymer of tetrafluoroethylene (TPV) and a perfluoroolefin, additionally contains up to 60% of the mass. copolymer of tetrafluoroethylene and PERFLUORO(alkylvinyl simple ether) (PAVE), in which the linear or branched alkyl group preferably contains from 1 to 5 carbon atoms.

Powder coating includes a copolymer of tetrafluoroethylene and PERFLUORO(alkylvinyl ether) (PAVE), whose linear or branched alkyl group preferably contains from 1 to 5 carbon atoms. The preferred monomers of PAVE are those in which the alkyl group contains 1, 2, 3 or 4 carbon atoms, and the copolymer can bytevalue using multiple monomers of PAVE. Preferred TPV copolymers include the APF (TPV/PAVE copolymer), TPV/HFP/PAVE, where PAVE is PAVE and/or PPVE and MFA (TPV/PMVE/PEVE, where the alkyl group HAVE has at least two carbon atoms).

The melting temperature of the copolymers TPV/perforating copolymers in the primer layer is usually below the melting temperature of the copolymers TPV/PAVA powder coating. For example, the melting temperature TPV/HFP, also known as solar cells, usually equal to about 510°F (266°C) and below the melting temperature of the TPV/PPVE, which usually amounts to about 590°F (310°C). Thus, surprisingly, a primer layer containing TPV/perforreviews copolymer with a low melting point, forms an excellent and durable coating system with TFE/PAVE (APF) with a higher melting temperature of the upper surface. It can be assumed that the system of the primer with a fluorocarbon polymer with a lower melting point could not withstand the high temperature heat treatment or sintering, usually from 675°F (357°C) up to 720°F. (382°C)when used with the systems of the APF and the copolymer with a lower melting temperature was destroyed would (bubbled), and it would cause delamination of the substrate. Unexpectedly, it was found that priming powder layer of TPV/perfluoroolefin in connection with powder on the freight from the APF forms a coating system, which during sintering becomes excellent in adhesion compared to the previous systems, the APF primer/PFA coating.

Polymeric binder

Powder primer coating used in this invention, moreover, contains in addition to the tetrafluoroethylene/pertroleum the copolymer polymeric binder, resistant to high temperatures, from 5 to 90 wt%. the polymer binder of the total weight of the fluoropolymer(s) and polymer binders. Linking component contains a polymer which is film-forming upon heating to fusion, is thermally stable and has a high duration of use in temperatures. Binder, as is well known, is used for sticky finishes for the bonding of the fluoropolymer to the substrate and to form the film. Binder usually contains no fluorine and also engages with the fluoropolymer. Preferred polymeric binders used in this invention include one or more of: (1) polyethersulfone (PES), which are amorphous thermoplastic polymers with a glass transition temperature of approximately 230°C, and a long lifetime at a high temperature from about 170°C to 190°C, (2) polyethylenesulphides (PPP), to the which are partially crystalline polymers with a melting point of about 280°C and a long lifetime at a high temperature from about 200°C to 240°C, and (3) polyaryleneethersulphones, such as polyetherketoneketone (PEKK), polyetheretherketone (Cape peek) and polyetherketone (PEC). Polyaryleneethersulphones are thermally stable at at least 250°C and melt at a temperature of at least 300°C and described in one or more of the following U.S. patents: 3065205, 3441538, 3442857, 5357040, 5131827, 4578427. All of the polymer binding substances, listed above, are thermally stable and dimensionally stable stable at temperatures in the range of their long-term operation and below, and they are resistant to abrasion. These polymers besides well-seize metal surfaces.

Other additives

In addition to the fluoropolymer powder primer and powder coating may contain inorganic fillers, film hardeners, pigments, stabilizers and other additives. Examples of suitable fillers and hardeners film include inorganic oxides, nitrides, borides and carbides of silicon, zirconium, tantalum, titanium, tungsten, boron and aluminum, and glass flakes, glass beads, glass fiber, aluminum silicate or zirconium, mica, flakes of metals, metal fibers, fine ceramic powders, silicon dioxide, titanium dioxide, barium sulfate, talc, black, charcoal, etc. and synthetic fibers of polyamides, polyesters and polimi the RC. In one of the embodiments of the powder primer contains from 10 to 20% of the mass. inorganic filler to the total weight of the fluoropolymer(s), linking the polymer and filler.

Getting priming powder

Powder primer containing a tetrafluoroethylene/perforreviews copolymer, a polymeric binder, optionally, other fluoropolymers, and other additives, which are discussed above, can be obtained using conventional mechanical methods of mixing the powder and the individual components.

Alternatively, the multicomponent particles of powder primer, i.e. tetrafluoroethylene/perforating copolymer and a polymeric binder, optionally, with another fluoropolymer, can be made according to the instructions in Brothers et al., U.S. patent 6232372 by combining particles of fluoropolymer and other components with a solution of a polymeric binder, mixing the polymer with a solution of a polymeric binder, and the selection of the composition of multicomponent particles of fluoropolymer with redispersion polymeric binding agent. Under "redispersion polymeric binding agent" is meant that the multicomponent mutual arrangement of the particles priming powder is not so, in which component a polymer binder dispersed in the photo the polymer component. Thus, the connecting component used in one of the embodiments of the present invention, is not in the form of a filler dispersed in the fluoropolymer component, but rather exists in the form of a coating that surrounds the fluoropolymer particles. Redispersible polymeric binder that is present on the surface of the multicomponent particles of this embodiment, promotes the adhesion of the particles with the substrate when the composition is used as a primer coating.

In a more preferred embodiment of the priming powder can be made in the form of a spray powder according to the directions of Felix et al. in U.S. patent 6518349 by spray drying the liquid dispersion priming particles of a tetrafluoroethylene/perforating copolymer with a polymeric binding agent and, optionally, other components, which are discussed above, to obtain the powdery granules agglomerated particles of a tetrafluoroethylene/perforating copolymer and linking of the polymer. Under "friable" means that these pellets can be crushed into particles of smaller size (crushed) without causing significant deformation of the particles, such as the formation of thin fibers, stretching from the particles at the bottom. Mixtures of polymers and components formed by the method of raspylitelnoj, are more homogeneous than the mixture formed by conventional mechanical methods of mixing powders of the individual components after the formation of powders. Multicomponent powder formed by spray drying, not separated during electrostatic coating with obtaining, thus, more uniform coatings on substrates.

Fluoropolymer component used in spray drying, usually available for purchase in the form of a polymer dispersion in water, which is the preferred form for the composition of the present invention for ease of use and acceptability in relation to the environment. By "dispersion" is meant that the fluoropolymer particles stably dispersed in the aqueous medium, so that the deposition of particles occurs at a time when you will use the variance; this is achieved by the small size of the fluoropolymer particles (also called primary particles) is usually of the order of 0.2 microns and the use of surfactants in aqueous dispersion by the manufacturer of the variance. Such dispersions can be obtained directly by the method known as dispersion polymerization, optionally with subsequent concentration and/or the further addition of surfactant.

Coating powders

Priming the powder and the powder coating can be applied to substrates by dry powder suspension in a suitable liquid with suitable surfactants or viscosity modifier, when desirable, and coating compositions by the method of wet coating. Preferably, the powder coating used in this invention, applied to a dried form by well known conventional methods, for example, hot flocking, electrostatic spraying, by means of an electrostatic fluidized bed, rocafuerte, etc. is Preferred electrostatic spraying, such as triboelectric spraying or sputtering using a corona discharge.

Priming powder is usually applied to the cleaned, fat-free substrates, which preferably have been treated by conventional treatment, such as sandblasting, etching and chemical treatment to promote adhesion of the coating to the substrate. While it may be coated with any appropriate substrate, typical examples of metal substrates include steel, high grade steel, stainless steel, aluminized steel and aluminum, among others. The method of applying a powder primer and outer primer on the substrate preferably occurs when the substrate is at a temperature of from 15 to 25°C.

Powder coating can be applied to the substrate in powder primer without first sintering powder primer, and this is called inflicted the use of a single substrate, i.e. during sintering of the coating is heated and the primer layer. If the system only sintering coated substrate is typically heated for 60 minutes at about 735°F (390°C). Alternatively, the powder coating can be applied and to warm up after sintered layer of primer, and this is called applying double sintering. Usually powder primer is applied on the substrate and is sintered at 725°F (385°C) for approximately 30 minutes followed by the application of powder coating, which is then bake for about 30 minutes at 725°F (385°C). In a typical use, the thickness of the primer layer is less than about 2 mils (50 micrometers), and the upper coating layer is not more than about 25 mils (650 micrometers). In another application, the thickness of the primer layer is less than about 1.5 mils (38 microns); the thickness of the coating layer is from about 1.5 to about 3 mils (38 microns to 76 micrometers).

Powder coating, described above, are used as the primer layer and top coating for anti-adhesive surfaces on the substrate of the present invention. These coatings are used for kitchen utensils and for heat-resistant glassware, as well as for numerous kinds of industrial applications, such as for the crimping rollers or belts for copiers and PE is Tausig devices valves, tanks, blades, pipes, metal foil, forms for stamps, for snow shovels and snow blowers, bottoms of ships, chutes, conveyors, moulds, tools, industrial containers, forms, reactor vessels with internal coating, car plates, heat exchangers, pipelines, etc.

TEST METHOD

The test of the strength of the adhesive bond

Aluminum plate (4,0"×12,0" (10.1 cm × 30.5 cm) was cleaned by acetone liquid for washing. The plate has a sandblasted surface. Plate cover in accordance with the description in each of the examples. The plate is subjected to the test of the strength of the adhesive bond, as described in detail below.

The strength of the connection is covered with metal plates define, exposing the coated substrate with a simplified test T-peel (Resistance of adhesives to peel). The sintered coating is cut to the metal substrate in parallel lines through one inch. For the separation of the tape coating using a chisel width of one inch, which is sufficient for retention. The coating separated from the substrate by hand or, alternatively, a pair of pliers.

The bond strength was evaluated before the test and after the test boiling water. To test the boiling water, the plate was immersed in boiling water naradabrokering time. Insolvent communication was assessed qualitatively using a rating system from 1 to 4, with a score of 4 is the best estimate of adhesion. A score of 1 is given to samples that demonstrate the failure of adhesion, which led to a very light exfoliation of the film. A score of 2 is given to samples in which the manifest failure of adhesion, which requires considerable effort on the peeling film. A score of 3 is given to samples which do not peeling, but the result is a significant stretch film or stretch film, followed by a gradual tear and rupture of the film. A score of 4 is given to samples in which only reveals itself break or stretch, followed by a gap.

EXAMPLES

In the following examples, the substrates of aluminum plates measuring approximately 4"×12" was cleaned with acetone and sand blast (100 grit aluminum oxide) to roughness of about 70-125 microinches RA using the camera for sandblasting Pro-Finish model F-3648 available for purchase from Empire Abrasive Equipment Company.

The powder coating is applied to the substrates using the spray gun for electrostatic coating powder Nordsen Sure-Coat. Covered plate, annealed hot air in an electrically heated convection oven for the time and at the temperatures indicated in the examples. Pécs is, used for these examples represent ovens ventilation from solvent class A.

For examples where the priming powder is made from a tetrafluoroethylene/perforating copolymer and a polymer binder by spray drying, used the spray dryer is an experimental spray dryer V type SD52 produced V Anhydro AS, Copenhagen, Denmark. Spray dryer works with the temperature of the inlet air To 300°C-320°C and outlet temperature 110°C-125°C. the Powder collected in a cyclone separator, the fine particles are collected on the filter for fine particles, and the hot air and water vapor are released. The dispersion is pumped using a peristaltic pump, and sprayed with dual liquid (air and liquid) of the nozzle. The air pressure in the nozzle is 60 lb/inch².

Fluoropolymers

Unless otherwise indicated in the following examples, the concentration of dispersions specified in % of the mass. of the total weight of solids and liquids. The solids content of the dispersions determined gravimetrically and indicate in % of the mass. the total weight of solids and liquids.

The rate of melt flow (MFR) measured at 372°C. by the method S (D-2116 or D-3307). MFR associated with the melt viscosity (MV) ratio V=53,15/MFR, when MFR is expressed in units of g/10 is in and MV is expressed in units of 10³PA·s.

The particle size of the raw dispersion (RDPS) was measured by photon correlation spectroscopy.

The average particle size of the powder is determined by the scattering of laser light on dry particles (using a Microtrac particle counter 101Laser available for purchase at Leeds & Northrup, Department of Honeywell Corporation).

The FEP dispersion: dispersion resin TFE/HFP in water with a solids content of from 28 to 32% of the mass. and particle size of the raw dispersion (RDPS) from 160 to 220 nanometers, the resin having the content of HFP 10.3 to 13.2 wt. -%, the rate of flow of the melt from 2.95 to 13.3. The melting point of the resin is equal to 507°F (264°C).

The variance of the APF: dispersion resin TFE/PPVE in water with a solids content of from 28 to 32% of the mass. and particle size of the raw dispersion (RDPS) from 150 to 245 nanometers, the resin having the content of PVA from 2.9 to 3.6 wt. -%, the rate of flow of the melt from 1.3 to 2.2. The melting point of the resin is equal to 590°F (310°C).

The PVC powder (product code 532-8110 available for purchase from DuPont): the powder of TFE/HFP containing the 10.3-13.2% of HFP, the particle size in the range of 26.3-46,6 microns and the rate of flow of the melt from 2.95 to 13.3 g/10 min, bulk density 48-72 g/100 cm³. The melting point of the resin is equal to 507°F (264°C).

Powder APF (type 350, product code 532-7410 available for purchase from DuPont): on Ashok fluoropolymer TPV/PPVE, containing a 2.9-3.6% of PVA, the particle size in the range of 28.5 to 0.9 microns and the rate of flow of the melt from 1.3 to 2.2 g/10 min, bulk density 56-87 g/100 cm³. The melting point of the resin is 590°F (310°C).

Polymeric binders

The polyster (PPP) is available for purchase from Ryton PR11-10 from Chevron Phillips Chemical Company.

Polyarilensulphone (PES) is available for purchase in the form of Simika Excel PES 4100mp from Sumitomo Chemical.

Peek (Cape peek) is available for purchase in the form of product brand 150F from Victrex.

Other components

Mica is available for purchase in the form of food stamps Afflair from EMD Chemicals.

Surfactant Silwet L-77 is available for purchase from GE Silicones.

Black pigment available for purchase as CI pigment black 28 at Engelhard Corporation.

Comparative example 1

The APF/PPP mechanically mixed priming powder

Mechanically mixed priming powder is made by placing PPP binder and powder the APF, DuPont 532-7410, plastic receptacle in the proportions listed in table 1, and rotation within 15 minutes. The powder is applied by electrostatic spraying on the processed sand blast aluminum plate, which was prepared as described above. Powder coating the APF, DuPont 532-7410, electrostatically applied on top of the priming powder is first coated with the formation of the top coating layer. The plate is placed in a furnace at 735°F (390°C) and bake for one hour in a single sintering operation. The final thickness of the coating has a thickness of 2.8 mils, and the thickness of the primer is equal to about 1 mil (25.4 micrometers), and the thickness of the top coating is about 1.8 mils (45.7 micrometer). The strength of the adhesive connection of the coating to the substrate test, using the test peeling described above, and the results are presented in table 1.

Mainly since the sintering of the coating is not readily peel before boiling, but after placing the plate in boiling water for 14 hours, the coating peels off from the substrate. Therefore, the test data is bad, short communication.

Example 1

FEP/PPP priming powder is mechanically mixed

Mechanically mixed priming powder is made by placing binders faculty and powder FEP, DuPont 532-8110, in the proportions listed in table 2, in a plastic vessel and rotation for 15 minutes. The powder was applied by electrostatic spraying on the processed sand blast aluminum plate, which was prepared as described above. Powder coating the APF, DuPont 532-7410, applied by elektrostaticheskogo coating on top of the primer powder coating with the formation of the top coating layer. The plate is placed in a furnace at 735°F (390°C) and bake for one hour in a single sintering operation. The final coating has a thickness of 2.8 mils, and the thickness of the primer is equal to about 1 mil (25.4 micrometers), and the thickness of the top coating is about 1.8 mils (45.7 micrometer). The strength of the adhesive connection of the coating to the substrate test, using the test otslaivanie, described above, and the results are presented in table 2.

Basically the past sintering the coating resists flaking as before boiling, and after boiling for 14 hours in the proof of strong long-term relationships.

Example 2

FEP/PFA/PPP priming powder is mechanically mixed

Mechanically mixed GRU is ovocny powder is made by placing binders PPP, powder FEP (DuPont 532-8110) and powder PFA (DuPont 532-7410) in the proportions listed in table 3, in a plastic vessel and rotation for 15 minutes. The powder was applied by electrostatic spraying on the processed sand blast aluminum plate, which was prepared as described above. Powder coating the APF, DuPont 532-7410, applied by elektrostaticheskogo coating on top of the primer powder coating with the formation of the top coating layer. The plate is placed in a furnace at 735°F (390°C) and bake for one hour in a single sintering operation. The final coating has a thickness of 2.8 mils, and the thickness of the primer is equal to about 1 mil (25.4 micrometers), and the thickness of the top coating is about 1.8 mils (45.7 micrometer). The strength of the adhesive connection of the coating to the substrate test, using the test peeling described above, and the results are presented in table 3.

Basically the past sintering the coating resists flaking as before boiling, and after boiling.

Comparative example 2

The APF/PPP priming powder is dried by spray

Priming powder APF/PPP receive, using spray drying. Deionized (DI) water, surfactant (Silwet L-77) and PPP are shown in table 4A, first mix using a paddle mixer with high shear. After five minutes of mixing, the mixer is switched off and the variance of the APF mixed using mixing with low shear. Include spray dryer V size for experiments and pre-heated to a temperature of inlet air To 300°C and in the atomizer serves DI water that was maintained at the temperature of 115°C. Change p is giving DI water in the dryer at a feed mixture of the APF. The rate of inflation for the mixture is adjusted to maintain the outlet temperature of the spray drier at 115°C. In the spray dryer, the water is evaporated in a stream of hot air, and the resulting powder is collected using a cyclone separator. The primer composition of the particles of the powder are presented in table 4b.

Priming powder is applied by electrostatic spraying on the sand-treated aluminum plate, which was prepared as described above. Powder coating the APF, DuPont 532-7410, applied by electrostatic spraying on top of the primer powder coating with the formation of the top coating layer. The plate is placed in a furnace at 735°F (390°C) and bake for one hour in a single sintering operation. The final coating has a thickness of 2.8 mils, and the thickness of the primer is equal to about 1 mil (25.4 micrometers), and the thickness of the top coating is about 1.8 mils (45.7 micrometer). The strength of the adhesive connection of the coating to the substrate test, using the test peeling described above, and the results are presented in table 4b.

Mainly since the sintering of the coating is not readily peel before boiling, however, once the plate is boiled in water for 14 hours, the coating is peeled from the substrate. Therefore, the test is testimony p is the Okha and short communications.

Example 3

FEP/PPS powder primer - dried spray

Receive a priming powder FEP/PPP for the primer, using spray drying. Deionized water, surfactant (Silwet L-77) and PPP are shown in table 5A, mixed using a paddle mixer with high shear. After five minutes of mixing, the mixer is switched off and the dispersion of FEP mixed using mixing with low shear. Include spray dryer V size for the experiment is in and pre-heated to a temperature of inlet air To 300°C and in the atomizer serves DI water, to maintain the outlet temperature of 115°C. Change the supply of DI water in the dryer at a feed mixture of FEP. The rate of inflation for the mixture is adjusted to maintain the outlet temperature of the spray drier at 115°C. In the spray dryer, the water is evaporated in a stream of hot air, and the resulting powder is collected using a cyclone separator. The average particle size of the collected powder is 25 microns. The primer composition of the particles of the powder are presented in table 5b.

Priming powder is applied by electrostatic spraying on the sand-treated aluminum plate, which was prepared as described above. Powder coating the APF, DuPont 532-7410, put on top of the primer layer. The plate is placed in a furnace at 735°F (390°C) and bake for one hour. The final coating has a thickness of 2.8 mils, and the thickness of the primer is equal to about 1 mil (25.4 micrometers), and the thickness of the top coating is about 1.8 mils (45.7 micrometer). The strength of the adhesive connection of the coating to the substrate test, using the test peeling described above, and the results are presented in table 5b.

Basically the past sintering the coating resists flaking as before boiling, and after boiling for 14 hours, which indicates a strong, lasting connection.

Example 4

FEP/PFA/PPP priming powder is dried by spray

Follow the procedure of example 3 with priming powder PFA/FEP/PPP. Deionized water, surfactant (Silwet L-77) and PPP are shown in table 6A, first mix using a paddle mixer with high shear. After mixing with a high shear dispersion of FEP and the variance of the APF is stirred with the mixture and dried in the spray dryer. The average particle size of the collected powder is 22 microns. The primer composition of the particles of the powder are presented in table 6b.

Priming powder is applied by electrostatic spraying on the sand-treated aluminum plate. Powder coating the APF, DuPont 532-7410, put on top of the primer layer. The plate is placed in a furnace at 735°F (390°C) and bake for one hour. The final coating has a thickness of 2.8 mils, and then the woman primers equal to about 1 mil (25.4 micrometers), and the thickness of the top coating is about 1.8 mils. The strength of the adhesive connection of the coating to the substrate test, using the test peeling described above, and the results are presented in table 6b.

Basically the past sintering the coating resists flaking as before boiling, and after boiling for 14 hours, which indicates a strong, lasting connection.

Example 5

Simulation of an industrial process, testing for baking

Follow the procedure of example 3 with the formation of priming powder, except that the priming powder has an additional pigments and fillers. Priming powder made from 3266 g of deionized water, to 9.9 g of surfactant (Silwet L-77), 460 g of PPS, 85 g of barium sulfate, 65 g Afflair 520 (mica) and 40 g black pigment the and. After mixing with a high shear was mixed into 1084 g of the dispersion of FEP. The primer composition of the powder is 46% PPP, 35% SC, 8.5% of barium sulfate, 6.5% of Afflair (mica), 4% black pigment.

Priming powder is applied by electrostatic spraying on the sand-treated aluminized steel pans for rolls, about 2 feet × 3 feet, which was purified and treated with sand blast according to the methods described above. The trays are deepening to ensure even baking hamburger buns. Powder the APF, DuPont 532-7410, put on top of the primer layer. Baking muffins are placed in an oven at 735°F (390°C) and bake for 1 hour. The final coating has a thickness of 2.8 mils, and the thickness of the primer is equal to about 1 mil (25.4 micrometers), and the thickness of the top coating is about 1.8 mils (45.7 micrometer). Pigment and fillers give the floor, good for hiding the substrate and having a uniform appearance.

The strength of the adhesive connection of the coating to the substrate test, using the test peeling described above. Since the sintering of the coating resists flaking as before boiling, and after boiling for 14 hours, which is confirmed by the estimation of strong ties, pointing to a strong long-term relationship.

Baking muffins, thus obtained, is subjected to simulated the industrial application of test cakes. Within 4 cycles per day raw dough is placed in the recesses in the pan for muffins, the trays are placed in an oven for baking and the temperature in the furnace linearly increase up to 450°F (232°C) for 20-minute cycle of baking with getting the hamburger buns. After 6 months and 1500 cycles no data of insolvency due to the coating with the substrate of the pan for rolls.

Example 6

PVC/PES priming powder is dried by spray

Follow the procedure of example 3 with the formation of the PVC/PES priming powder. Deionized water, surfactant (Silwet L-77), PES first mixed using a paddle mixer with a high shear in the quantities specified in table 7a. After mixing with a high shear dispersion of FEP admixed to the mixture and dried in the spray dryer. The average particle size of the collected powder is 15 microns. The primer composition of the particles of the powder are presented in table 7b.

Priming powder is applied by electrostatic spraying on the sand-treated aluminum plate. Powder coating the APF, DuPont 532-7410, put on top of the primer layer. The plate is placed in a furnace at 735°F (390°C) and bake for one hour. The final coating has a thickness of 2.8 mils, and the thickness of the primer is equal to about 1 mil (25.4 micrometers), and tol is in the top coating is about 1.8 mils (45.7 micrometer). The strength of the adhesive connection of the coating to the substrate test, using the test peeling described above.

The bond strength of the coating systems is estimated at 4, as before boiling, and after boiling for 14 hours, which indicates a strong, long-term relationship.

Example 7

FEP/Cape peek priming powder is dried by spray

Follow the procedure of example 3 with the formation of FEP/Cape peek priming powder. Deionized water, surfactant (Silwet L-77), Cape peek first mixed using a paddle mixer with a high shear in amounts shown in table 8A. After mixing with a high shear dispersion of FEP admixed to the mixture and dried in the spray dryer. The average particle size of the collected powder is 19 microns. The primer composition of the particles of the powder are presented in table 8b.

Priming powder is applied by electrostatic spraying on the sand-treated aluminum plate. Powder coating the APF, DuPont 532-7410, put on top of the primer layer. The plate is placed in a furnace at 735°F (390°C) and bake for one hour. The final coating has a thickness of 2.8 mils, and the thickness of the primer is equal to about 1 mil (25.4 micrometers), and the thickness of the top coating is about 1.8 mils (45.7 micrometer). The strength of the adhesive connection of the coating to the substrate test, using the test peeling described above.

The bond strength of the coating systems is estimated at 4 as before boiling, and after boiling for 14 hours, that evidence is about the duty to regulate strong, a long-term relationship.

1. The method of obtaining anti-adhesive surface on the substrate, comprising (a) applying priming powder obtained by spray drying, to a specified substrate with education on it Grun owocnego layer, (b) applying a powder coating to the specified primer layer with the formation of the coating layer on the specified primer layer, and this primer contains a tetrafluoroethylene/perforreviews copolymer and a polymer binder, and the said coating contains a copolymer of a tetrafluoroethylene/PERFLUORO (alkylvinyl simple ether), where the specified perfluoroolefin is a perfluorinated alkene containing from 3 to 8 carbon atoms, and where the specified polymer binder selected from the group consisting of polyethersulfones, polyphenylensulfide and polyaryleneethersulphones,
(C) sintering the specified primer layer and the coating layer formation of this anti-adhesive surface.

2. The method according to claim 1, where the specified perfluoroolefin is HEXAFLUOROPROPYLENE.

3. The method according to claim 1, where the alkyl group is specified PERFLUORO (alkylvinyl simple ester contains from 1 to 5 carbon atoms.

4. The method according to claim 1, where PERFLUORO (alkylvinyl simple ether) is PERFLUORO (propylvinyl simple ether).

5. The method according to claim 1, where the specified primer powder is applied by electrostatic spraying.

6. The method according to claim 1, where the powder coating is applied by electrostatic spraying.

7. The method according to claim 1, where the specified polymer binder including the AET polyster.

8. The method according to claim 1, where the specified primer powder additionally contains up to 60 wt.% the tetrafluoroethylene/PERFLUORO (alkylvinyl simple ether).

9. The method according to claim 1, where the specified primer powder contains from 5 to 90 wt.% the polymer binder of the total weight of the specified polymer and the polymeric binder.

10. The method according to claim 1, where the specified primer contains from 10 to 20 wt.% inorganic filler to the total weight of the specified fluoropolymer, a polymer binder, and filler.

11. The method according to claim 1, where the powder of the specified primer powder contains particles containing as specified fluoropolymer and the specified polymer binder.

12. The method according to claim 1, where the specified substrate selected from the group consisting of carbon steel, aluminum and aluminized steel.

13. The method according to claim 1, where the specified substrate is at a temperature of from 15 to 25°C, when carried out stage (a) and (b).

14. The method according to claim 1, where the application of the powder coating on the primer layer is carried out before the sintering of the primer, in accordance with which the sintering of the coating layer is sintered and the primer layer.

15. The method according to claim 1, where the application of the powder coating on the primer layer is carried out after the sintering of the primer, and primer spec is jut after application of the powder coating.

16. The method according to claim 1, where the primer layer has a thickness of less than 2 mils (50 microns), and the coating layer has a thickness of not more than 25 mil (650 μm).

17. The method according to 14, where the specified primer layer has a thickness of less than 1.5 mils.

18. The method according to 14, where the specified layer of the coating has a thickness of from 1.5 to 3 mils (38 to 76 microns).

19. A substrate with a release coating thereon produced by the method claim 1.