CN116790179A - Preparation method of metal powder coating - Google Patents
Preparation method of metal powder coating Download PDFInfo
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- CN116790179A CN116790179A CN202310734724.8A CN202310734724A CN116790179A CN 116790179 A CN116790179 A CN 116790179A CN 202310734724 A CN202310734724 A CN 202310734724A CN 116790179 A CN116790179 A CN 116790179A
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- 239000000843 powder Substances 0.000 title claims abstract description 120
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 89
- 239000002184 metal Substances 0.000 title claims abstract description 89
- 238000000576 coating method Methods 0.000 title claims abstract description 39
- 239000011248 coating agent Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000000049 pigment Substances 0.000 claims abstract description 70
- 238000000034 method Methods 0.000 claims abstract description 40
- 238000001816 cooling Methods 0.000 claims abstract description 35
- 238000003756 stirring Methods 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 12
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000007873 sieving Methods 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 239000011229 interlayer Substances 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 230000000694 effects Effects 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 8
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 6
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 6
- ISAOCJYIOMOJEB-UHFFFAOYSA-N benzoin Chemical compound C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-UHFFFAOYSA-N 0.000 claims description 6
- 239000002826 coolant Substances 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 6
- OUPZKGBUJRBPGC-UHFFFAOYSA-N 1,3,5-tris(oxiran-2-ylmethyl)-1,3,5-triazinane-2,4,6-trione Chemical compound O=C1N(CC2OC2)C(=O)N(CC2OC2)C(=O)N1CC1CO1 OUPZKGBUJRBPGC-UHFFFAOYSA-N 0.000 claims description 5
- QRJOYPHTNNOAOJ-UHFFFAOYSA-N copper gold Chemical compound [Cu].[Au] QRJOYPHTNNOAOJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 230000009477 glass transition Effects 0.000 claims description 4
- 229920001225 polyester resin Polymers 0.000 claims description 4
- 239000004645 polyester resin Substances 0.000 claims description 4
- 244000028419 Styrax benzoin Species 0.000 claims description 3
- 235000000126 Styrax benzoin Nutrition 0.000 claims description 3
- 235000008411 Sumatra benzointree Nutrition 0.000 claims description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 3
- 229960002130 benzoin Drugs 0.000 claims description 3
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 235000019382 gum benzoic Nutrition 0.000 claims description 3
- 235000010215 titanium dioxide Nutrition 0.000 claims description 3
- 239000002932 luster Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000005507 spraying Methods 0.000 description 7
- 238000001125 extrusion Methods 0.000 description 6
- 238000009775 high-speed stirring Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 238000005054 agglomeration Methods 0.000 description 4
- 230000002776 aggregation Effects 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 238000005243 fluidization Methods 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- 238000007580 dry-mixing Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/0013—Controlling the temperature of the process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/14—Production of inert gas mixtures; Use of inert gases in general
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to a preparation method of a metal powder coating, and belongs to the technical field of powder coating preparation. The method comprises the steps of firstly adding pigment and base powder into a bonding machine, wherein the mass of the pigment is 3% -8% of that of the base powder; then introducing nitrogen protection gas, and setting the stirring rotation speed to be 60 rpm-600 rpm; uniformly preheating the inner wall of a bonding kettle of the bonding machine, and performing bonding timing for 180-600 s when the material temperature in the bonding machine reaches the preheating bonding temperature; after bonding, placing the mixture into a cooling kettle communicated with the bonding kettle for cooling to obtain metal bonding powder; sieving, adding aluminum oxide, and obtaining the metal powder coating; according to the method, the material heating preparation time in the early stage of the bonding process is greatly shortened through premixing constant-temperature heating, the low-rotation-speed stirring bonding effectively ensures that the finished powder has good metallic pigment color, bonding stability and bonding efficiency of the metallic powder coating are effectively improved, and meanwhile, the operation flow of the bonding process is simplified.
Description
Technical Field
The invention relates to a preparation method of a metal powder coating, and belongs to the technical field of powder coating preparation.
Background
The metal powder coating is various powder coatings containing metal pigment (such as copper powder, silver powder and the like), and the current metal powder coating production technology mainly comprises a dry mixing method, a melt extrusion method and a thermal bonding method. The dry mixing method is simple to operate, and can be completed by simply and mechanically stirring the base powder and the metal pigment; however, the method has the problems of uneven spraying effect, easy gun blockage in the spraying construction process and the like. The melt extrusion method is consistent with the powder production process, the metal pigment and the powder base material are mixed, and then the mixture is prepared by melt extrusion, tabletting, crushing and grinding separation of an extruder; according to the method, due to the shearing action of the screw in the melt extrusion process, the two-dimensional plane of the metal pigment is twisted and broken, and the flashing surface is damaged; meanwhile, the high-temperature aerobic environment causes oxidation of the metal pigment, so that the metal color is dark, and the expected effect cannot be achieved.
The thermal bonding method is to stir the base powder by a stirring paddle of a bonding machine to generate heat by friction, and continuously stir until the temperature rises to the glass transition temperature (T g ) Above the point, adding metal pigment into the auxiliary feeder to bond the metal powder; compared with a dry mixing method and a melt extrusion method, the finished powder bonded by the method greatly improves the physicochemical properties of the metal pigment and the base powder, and avoids the defect that the metal effect of the metal pigment and the base powder on the surface of the plate is inconsistent due to factors such as voltage, gravity, charge quantity and the like in the spraying process. However, the hot bonding method in the prior art is mainly based on high-speed stirring (stirring speed is above 1000 rpm) of the base powder by a screw in a bonding kettle, so that the base powder is rubbed and heated to reach bonding temperature; simultaneously, the powder is stirred at a high speed to obtain higher kinetic energy, and the temperature is increased to T g When the point is near, the powder body is softened correspondingly, and under the high-speed stirring of the stirring paddle, the high-temperature softened base powder is impacted on the inner wall of the bonding machine, so that the base powder is accumulated and hardened on the periphery of the bonding kettle wall, the upper top cover, the air outlet and the stirring paddle of the bonding machine; at the moment, the metal pigment is added inevitably to lead the metal pigment to be firstly attached to the inner wall of the bonding kettle, and simultaneously the high-speed stirring process can definitely lead the two-dimensional structure of the metal pigment to be bent, thereby leading the bonding finished product powder to beThe metal has dark color and poor flashing effect. In addition, the base powder softened in a high-speed friction stir heating mode is accumulated on the inner wall of the bonding kettle, so that the content of the actual bonding metal pigment is increased, and the difference of the effect of the finished powder among different bonding batches is larger.
Disclosure of Invention
Aiming at the defects in the prior art, one of the purposes of the invention is to provide a preparation method of metal powder coating, which solves the problems of dark metal color of bonding finished powder, poor flashing effect and larger difference of the effect of the finished powder among different bonding batches, and simultaneously, the bonding efficiency of the metal powder coating is obviously improved, and the bonding procedure is simplified.
The aim of the invention is achieved by the following technical scheme.
A method for preparing a metal powder coating, comprising the steps of:
(1) Adding pigment and base powder into a bonding machine;
the pigment is at least one of metal pigment and imitation metal pigment; the imitation metal pigment is a pigment with metallic luster;
the mass of the pigment is 3-8% of that of the base powder;
the base powder is conventional base powder in the technical field of metal powder coating;
(2) Introducing nitrogen protection gas into the bonding machine, setting the rotation speed of low-speed stirring to be 60-600 rpm, and uniformly preheating the inner wall of the bonding kettle of the bonding machine, wherein the preheating bonding temperature is (T) g +10)℃～(T g +20)℃，T g A glass transition temperature for the base powder;
(3) When the material temperature in the bonding machine reaches the preheating bonding temperature in the step (2), starting bonding timing, wherein the bonding timing time is 180-600 s;
(4) After the bonding process is finished, placing the metal bonding powder into a cooling kettle communicated with the bonding kettle for rapid cooling to obtain metal bonding powder;
(5) Taking out the metal bonding powder obtained in the step (4), sieving, adding aluminum oxide, improving fluidization and preventing agglomeration; the added mass of the alumina is 0.1-0.3% of the mass of the metal bonding powder, and the metal powder coating is obtained.
Preferably, the particle size of the metal pigment or the imitation metal pigment is 30-100 mu m; the median particle diameter (D50) of the base material is 40-45 mu m.
Preferably, in the step (1), the metal pigment is red copper gold powder; the imitation metal pigment is pearlescent pigment;
the base powder comprises the following raw material components in percentage by mass based on 100% of the total mass of the base powder: 70% of polyester resin, 5% of triglycidyl isocyanurate (TGIC), 1% of flatting agent, 0.3% of benzoin and 23.7% of pigment and filler; the pigment and filler is a mixture of barium sulfate, iron oxide red, phthalocyanine blue and titanium white.
Preferably, an interlayer is arranged between the inner wall and the outer wall of the bonding kettle of the bonding machine, heat source water or heat source oil is introduced into the interlayer as a heat transfer medium, and the interlayer of the bonding machine is uniformly preheated, so that materials in the bonding kettle are heated.
Further preferably, in the step (2), heat source water is introduced into the interlayer of the bonding kettle, and the interlayer of the bonding machine is uniformly preheated.
Further preferably, in the step (4), the method of rapid cooling is that an interlayer is arranged on the outer wall of the cooling kettle, a stirring device is arranged in the cooling kettle, cold source water or air flow is introduced into the interlayer as a cooling medium, and the discharging (high temperature) of the bonding kettle is fully contacted with the outer wall (low temperature) of the cooling kettle under the stirring action to generate heat exchange, so that rapid cooling is realized.
Advantageous effects
(1) The invention provides a preparation method of a metal powder coating, which is characterized in that the inner wall of a bonding kettle is preheated, so that pigment and base powder in the bonding kettle are preheated, and the base powder can reach bonding temperature without high-speed stirring of a propeller; the bonding time can be effectively shortened, the rotating speed can be reduced, the problem that the high-temperature softened base powder is subjected to violent impact due to high-speed stirring and adhesion and stacking hardening are caused on the periphery of the cylinder wall, the upper top cover, the exhaust port and the stirring paddle of the bonding machine is solved, and therefore the consistency of the proportion of the metal pigment between different bonding batches is ensured; meanwhile, the stirring rotating speed can be effectively reduced, the damage of the screw propeller to the metal pigment form is effectively avoided by adopting a low-rotating-speed stirring mode, the consistency of the metal color of the bonding finished powder and the effect of the finished powder among different bonding batches is improved, and the good metal pigment color of the finished powder is effectively ensured.
(2) The invention provides a preparation method of a metal powder coating, wherein an interlayer is arranged between the inner wall and the outer wall of a bonding kettle of a bonding machine, heat source water or heat source oil is introduced into the interlayer as a heat transfer medium, and materials in a charging barrel of the bonding machine are uniformly heated, so that the operation flow of the bonding process is simplified, and the method is convenient and quick.
(3) The invention provides a preparation method of a metal powder coating, which comprises the steps of arranging an interlayer on the outer wall of a cooling kettle, arranging a stirring device in the cooling kettle, introducing cold source water or air flow into the interlayer as a cooling medium, and fully contacting the discharging (high temperature) of a bonding kettle with the outer wall (low temperature) of the cooling kettle under the stirring effect to generate heat exchange, thereby realizing rapid cooling, high efficiency and convenience.
(4) The invention provides a preparation method of a metal powder coating, wherein the particle size of a pigment is preferably 30-100 mu m; the median particle diameter (D50) of the base material is preferably 40-45 μm; the pigment and the base material with the particle size are stirred and mixed more fully and uniformly at a low rotating speed, the prepared metal powder coating has stronger metallic feeling, and the pigment and the base powder have better bonding effect.
Detailed Description
The technical scheme of the present invention will be clearly and completely described in conjunction with the following examples of the present invention, wherein the methods are conventional methods unless otherwise specified, and the raw materials are commercially available from the public sources unless otherwise specified.
In the following examples:
the bonding machine is produced by a smoke table Ling Yu powder machinery company;
the polyester resin is P5021, weihailong color new material Co., ltd;
the leveling agent is WL588, ningbo-wikipedia chemical Co., ltd;
the base powder is prepared by the following method:
(1) Weighing the raw materials of all the components of the base powder according to the mass percentage, and then adding the raw materials into a mixer for fully stirring to obtain the uniformly mixed base powder raw materials;
the base powder comprises the following raw materials in percentage by mass based on 100% of the total mass of the base powder: 70% of polyester resin, 5% of triglycidyl isocyanurate (TGIC), 1% of flatting agent, 0.3% of benzoin and 23.7% of pigment filler, wherein the pigment filler is a mixture of barium sulfate, iron oxide red, phthalocyanine blue and titanium white;
(2) Adding a base powder raw material into a feeder of an extruder, carrying out melt extrusion, tabletting and crushing to obtain a tablet;
(3) Further crushing, grinding and sieving the tablets to obtain a finished product of the base powder with a medium particle diameter (D50) of 40-45 mu m, wherein the base powder has a glass transition temperature (T g ) 57 ℃.
Example 1
A method for preparing a metal powder coating, comprising the steps of:
(1) Adding pigment and base powder into a bonding machine; the pigment is red copper gold powder and pearlescent pigment, the particle size of the pigment is 30-100 mu m, and the mass of the pigment is 3% of the mass of the base powder;
(2) Introducing nitrogen protection gas into the bonding machine, and setting the rotation speed of low-rotation-speed stirring to be 60rpm; an interlayer is arranged between the inner wall and the outer wall of a bonding kettle of the bonding machine, heat source water is introduced into the interlayer to serve as a heat transfer medium, the water temperature of the heat source water is kept at 67-69 ℃, the inner wall of the bonding kettle of the bonding machine is uniformly preheated, and the preheating bonding temperature is 67 ℃;
(3) When the material temperature in the bonding machine reaches 67 ℃ of the preheating bonding temperature in the step (2), starting bonding timing, wherein the bonding timing time is 180s;
(4) After the bonding process is finished, placing the material into a cooling kettle communicated with the bonding kettle, arranging an interlayer on the outer wall of the cooling kettle, arranging a stirring device in the cooling kettle, introducing cold source water into the interlayer as a cooling medium, and fully contacting the material placed into the bonding kettle with the outer wall of the cooling kettle under the stirring effect to realize rapid cooling to obtain metal bonding powder;
(5) Taking out the metal bonding powder obtained in the step (4), sieving, adding aluminum oxide, improving fluidization and preventing agglomeration; the added mass of the alumina is 0.1% of the mass of the metal bonding powder, so that the metal powder coating is obtained.
Example 2
A method for preparing a metal powder coating, comprising the steps of:
(1) Adding pigment and base powder into a bonding machine; the pigment is red copper gold powder and pearlescent pigment, the particle size of the pigment is 30-100 mu m, and the mass of the pigment is 6% of the mass of the base powder;
(2) Introducing nitrogen protection gas into the bonding machine, and setting the rotation speed of low-rotation-speed stirring to be 200rpm; an interlayer is arranged between the inner wall and the outer wall of a bonding kettle of the bonding machine, heat source water is introduced into the interlayer to serve as a heat transfer medium, the water temperature of the heat source water is kept at 67-69 ℃, the inner wall of the bonding kettle of the bonding machine is uniformly preheated, and the preheating bonding temperature is 67 ℃;
(3) When the material temperature in the bonding machine reaches 67 ℃ of the preheating bonding temperature in the step (2), starting bonding timing, wherein the bonding timing time is 600s;
(4) After the bonding process is finished, placing the material into a cooling kettle communicated with the bonding kettle, arranging an interlayer on the outer wall of the cooling kettle, arranging a stirring device in the cooling kettle, introducing air flow into the interlayer as a cooling medium, and fully contacting the material discharged from the bonding kettle with the outer wall of the cooling kettle under the stirring action to realize rapid cooling to obtain metal bonding powder;
(5) Taking out the metal bonding powder obtained in the step (4), sieving, adding aluminum oxide, and improving fluidization to prevent agglomeration; the added mass of the alumina is 0.1% of the mass of the metal bonding powder, so that the metal powder coating is obtained.
Example 3
A method for preparing a metal powder coating, comprising the steps of:
(1) Adding pigment and base powder into a bonding machine; the pigment is red copper gold powder and pearlescent pigment, the particle size of the pigment is 30-100 mu m, and the mass of the pigment is 8% of the mass of the base powder;
(2) Introducing nitrogen protection gas into the bonding machine, and setting the rotation speed of low-rotation stirring to be 600rpm; an interlayer is arranged between the inner wall and the outer wall of a bonding kettle of the bonding machine, heat source oil is introduced into the interlayer to serve as a heat transfer medium, the oil temperature of the heat source oil is kept at 77-79 ℃, the inner wall of the bonding kettle of the bonding machine is uniformly preheated, and the preheating bonding temperature is 77 ℃;
(3) When the material temperature in the bonding machine reaches 77 ℃ of the preheating bonding temperature in the step (2), starting bonding timing, wherein the bonding timing time is 180s;
(4) After the bonding process is finished, placing the material into a cooling kettle communicated with the bonding kettle, arranging an interlayer on the outer wall of the cooling kettle, arranging a stirring device in the cooling kettle, introducing cold source water into the interlayer as a cooling medium, and fully contacting the material placed into the bonding kettle with the outer wall of the cooling kettle under the stirring effect to realize rapid cooling to obtain metal bonding powder;
(5) Taking out the metal bonding powder obtained in the step (4), sieving, adding aluminum oxide, and improving fluidization to prevent agglomeration; the added mass of the alumina is 0.3% of the mass of the metal bonding powder, so that the metal powder coating is obtained.
Spraying experiments are carried out on the metal powder coatings prepared in the examples 1-3 by a cyclone separation method and a high-low voltage method, and the spraying parameters are as follows: spraying voltage is 60kV, atomization starting pressure is 0.2kPa, and gun distance is 300mm; the test results show that the metal powder prepared in examples 1-3 has little visual effect difference between the metal sense before cyclone separation and after cyclone separation, and the metal sense is obviously enhanced along with the increment of the pigment content in the metal powder coating; meanwhile, in the metal powder coating prepared in the examples 1 to 3, the metal powder coating with high pigment content (example 3) is uniform in powder discharge before and after cyclone separation under the same spraying condition, so that the gun is not easy to be blocked, and the good bonding effect between the pigment and the base powder is achieved in the metal powder coating prepared by the method.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (6)
1. A preparation method of a metal powder coating is characterized by comprising the following steps: the method comprises the following steps:
(1) Adding pigment and base powder into a bonding machine;
the pigment is at least one of metal pigment and imitation metal pigment; the imitation metal pigment is a pigment with metallic luster;
the mass of the pigment is 3-8% of that of the base powder;
(2) Introducing nitrogen protection gas into the bonding machine, setting the rotation speed of low-speed stirring to be 60-600 rpm, and uniformly preheating the inner wall of the bonding kettle of the bonding machine, wherein the preheating bonding temperature is (T) g +10)℃～(T g +20)℃，T g A glass transition temperature for the base powder;
(3) When the material temperature in the bonding machine reaches the preheating bonding temperature, starting bonding timing, wherein the bonding timing time is 180-600 s;
(4) After the bonding process is finished, placing the mixture into a cooling kettle communicated with the bonding kettle for cooling to obtain metal bonding powder;
(5) Taking out the metal bonding powder, sieving, adding aluminum oxide, wherein the added aluminum oxide accounts for 0.1-0.3% of the mass of the metal bonding powder, and obtaining the metal powder coating.
2. The method for preparing a metal powder coating according to claim 1, wherein: the particle size of the metal pigment or the imitation metal pigment is 30-100 mu m; the median particle diameter of the base material is 40-45 mu m.
3. A method of producing a metallic powder coating according to claim 1 or 2, characterized in that: in the step (1), the metal pigment is red copper gold powder; the imitation metal pigment is pearlescent pigment;
the base powder comprises the following raw material components in percentage by mass based on 100% of the total mass of the base powder: 70% of polyester resin, 5% of triglycidyl isocyanurate, 1% of flatting agent, 0.3% of benzoin and 23.7% of pigment and filler; the pigment and filler is a mixture of barium sulfate, iron oxide red, phthalocyanine blue and titanium white.
4. A method of producing a metal powder coating according to any one of claims 1 to 3, characterized in that: an interlayer is arranged between the inner wall and the outer wall of the bonding kettle of the bonding machine, and heat source water or heat source oil is introduced into the interlayer to uniformly preheat the interlayer of the bonding machine.
5. The method for preparing a metal powder coating according to claim 4, wherein: and (2) introducing heat source water into the interlayer of the bonding kettle, and uniformly preheating the interlayer of the bonding machine.
6. The method for preparing a metal powder coating according to claim 4, wherein: in the step (4), the cooling method is that an interlayer is arranged on the outer wall of the cooling kettle, a stirring device is arranged in the cooling kettle, cold source water or air flow is introduced into the interlayer as a cooling medium, and the discharging of the bonding kettle is contacted with the outer wall of the cooling kettle under the stirring effect, so that cooling is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310734724.8A CN116790179A (en) | 2023-06-20 | 2023-06-20 | Preparation method of metal powder coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310734724.8A CN116790179A (en) | 2023-06-20 | 2023-06-20 | Preparation method of metal powder coating |
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Citations (5)
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| CN108102506A (en) * | 2017-12-20 | 2018-06-01 | 青岛豪元晟五金塑胶有限公司 | Bonding Pearlescent powder paint and preparation method thereof |
| CN108373765A (en) * | 2018-02-06 | 2018-08-07 | 佛山市南海嘉多彩粉末涂料有限公司 | A kind of bonding metal-effect powder paint |
| CN110684443A (en) * | 2019-11-08 | 2020-01-14 | 甘肃西部邦奇装饰材料科技有限公司 | Anticorrosive powder coating for outdoor metal guardrail and preparation method thereof |
| CN114276740A (en) * | 2021-11-22 | 2022-04-05 | 科浦勒塑料粉末(佛山)有限公司 | Weather-resistant light energy storage metal powder coating and preparation method thereof |
| CN217473290U (en) * | 2022-06-21 | 2022-09-23 | 烟台万亨智能设备有限公司 | Metal powder bonding mixing unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108102506A (en) * | 2017-12-20 | 2018-06-01 | 青岛豪元晟五金塑胶有限公司 | Bonding Pearlescent powder paint and preparation method thereof |
| CN108373765A (en) * | 2018-02-06 | 2018-08-07 | 佛山市南海嘉多彩粉末涂料有限公司 | A kind of bonding metal-effect powder paint |
| CN110684443A (en) * | 2019-11-08 | 2020-01-14 | 甘肃西部邦奇装饰材料科技有限公司 | Anticorrosive powder coating for outdoor metal guardrail and preparation method thereof |
| CN114276740A (en) * | 2021-11-22 | 2022-04-05 | 科浦勒塑料粉末(佛山)有限公司 | Weather-resistant light energy storage metal powder coating and preparation method thereof |
| CN217473290U (en) * | 2022-06-21 | 2022-09-23 | 烟台万亨智能设备有限公司 | Metal powder bonding mixing unit |
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