CN113265191A - Powder spraying process - Google Patents
Powder spraying process Download PDFInfo
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- CN113265191A CN113265191A CN202110514409.5A CN202110514409A CN113265191A CN 113265191 A CN113265191 A CN 113265191A CN 202110514409 A CN202110514409 A CN 202110514409A CN 113265191 A CN113265191 A CN 113265191A
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- Prior art keywords
- flour
- base powder
- powder
- agent
- spraying
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- 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/12—Applying particulate materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/542—No clear coat specified the two layers being cured or baked together
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- 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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- 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
- C09D5/032—Powdery paints characterised by a special effect of the produced film, e.g. wrinkle, pearlescence, matt finish
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a powder spraying process, which comprises the following steps: s1: spraying the base powder on the surface of a workpiece to obtain a base powder coating; s2: spraying flour on the surface of the base powder coating in S1; s3: baking S2 the surface of the workpiece, solidifying the base powder and the flour; the base powder mainly comprises epoxy resin, polyurethane resin, a sand pattern agent and an auxiliary agent; the flour mainly comprises polyurethane resin, a graining agent and an auxiliary agent; the percentage content of the sand grain agent in the base powder in the total mass of the base powder is less than the percentage content of the sand grain agent in the flour in the total mass of the flour. The base powder and the flour both contain the graining agent, the graining agent in the flour accounts for a large percentage of the total mass of the flour, the flour coating is firstly heated and cured, and convex and concave sand grains are formed on the interface of the flour and the base powder, so that the interface area of the base powder and the flour is larger than the coating area, the adhesive force between the base powder coating and the flour coating is increased, the adhesion between the coatings is tighter, and the orange peel phenomenon is reduced.
Description
Technical Field
The invention relates to the technical field of coating, in particular to a powder spraying process.
Background
In the manufacturing of sheet metal products, the spraying technology is one of the main key process technologies for sheet metal manufacturing, and meanwhile, the coating quality of the products is an important index for evaluating the sheet metal quality, so that not only is good corrosion resistance achieved, but also excellent outdoor durability is required.
At present, the conventional coating process adopts a two-coating and two-baking mode, the two-coating and two-baking process can improve the corrosion resistance of the coating, the energy consumption is high, and the production efficiency is influenced due to the complex operation. The existing two-coating one-baking process is used for replacing the prior two-coating one-baking process, so that the production efficiency of coating is improved, but the following defects still exist: the adhesive force between the base powder and the flour is low in qualification rate, and the appearance is easy to have the unevenness phenomenon of orange peel and the like in the curing and baking process, so that the requirements of customers cannot be met, and most of the base powder needs to be reworked and repaired.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a powder spraying process, which effectively prevents the appearance of unevenness such as orange peel and the like by adding a graining agent into base powder and flour for sanding and solidifying to improve the adhesive force between the base powder and the flour.
In order to realize the process effect, the technical scheme of the invention is as follows: a powder spray coating process comprising the steps of:
s1: spraying the base powder on the surface of a workpiece to obtain a base powder coating;
s2: spraying flour on the surface of the base powder coating in S1;
s3: baking S2 the surface of the workpiece, solidifying the base powder and the flour;
the base powder mainly comprises epoxy resin, polyurethane resin, a sand-textured agent and an auxiliary agent; the flour mainly comprises polyurethane resin, a graining agent and an auxiliary agent; the percentage content of the sand grain agent in the base powder in the total mass of the base powder is less than the percentage content of the sand grain agent in the flour in the total mass of the flour.
The epoxy resin in the base powder has good solvent resistance, salt spray resistance and good substrate protection; the polyester resin in the flour has good weather resistance and can protect the base powder. The base powder and the flour both contain the graining agent, the graining agent in the flour accounts for a large percentage of the total mass of the flour, the flour coating is firstly heated and cured, and convex and concave sand grains are formed on the interface of the flour and the base powder, so that the interface area of the base powder and the flour is larger than the coating area, the adhesive force between the base powder coating and the flour coating is increased, the adhesion between the coatings is tighter, and the orange peel phenomenon is reduced. The base powder and the flour both contain polyurethane resin, so that the compatibility between the base powder and the flour is effectively improved; meanwhile, functional groups of hydroxyl of polyester resin in the flour can react with functional groups of epoxy resin in the base powder to crosslink and solidify, so that the adhesive force between the base powder coating and the flour coating is improved.
In order to sand a paint film, adjust the grain size of sand grains and prevent the bottom powder and the flour powder from sagging, the preferable technical scheme is as follows: the auxiliary agent comprises bentonite, and the mass ratio of the sand streak agent to the bentonite in the base powder is 1: (3-6); the mass ratio of the sand grain agent to the bentonite in the flour is 1: (2-4). The sand streak agent and the bentonite are matched to eliminate shrinkage cavities of the coating film caused by uneven surface tension of the coating film, so that the appearance of a workpiece is not influenced.
In order to obtain texture with reasonable size and adjust the fluidity of the melting of the base powder and the flour before solidification, the preferable technical scheme is as follows: the auxiliary agent further comprises polyethylene wax, and the mass ratio of the sand streak agent to the polyethylene wax in the flour is 1: (2-5); the mass ratio of the sand grain agent to the polyethylene wax in the base powder is 1: (4-6).
In order to optimize the performance of the base powder and the flour and achieve the best adhesive force between the base powder and the flour, the preferable technical scheme is as follows: the flour and the base powder both comprise pigments, and the base powder mainly comprises, by mass, 25-40 parts of epoxy resin, 20-35 parts of polyurethane resin, 0.1-0.3 part of sand grain agent, 0.5-1.5 parts of bentonite, 0.2-0.7 part of polyethylene wax, 15-25 parts of filler and 15-25 parts of pigment; the flour mainly comprises 40-60 parts of polyurethane resin, 0.5-0.8 part of sand grain agent, 1-2 parts of bentonite, 2-4 parts of polyethylene wax, 15-30 parts of filler and 10-25 parts of pigment. The filler comprises calcium carbonate and/or barium sulfate, the filler mainly improves the thickness, the wear resistance, the water resistance, the heat resistance, the surface hardness, the impact resistance and the like of the coating, and further the filler is the barium sulfate. The pigments comprise titanium dioxide and other pigments commonly used in the field, and the texture of the paint film is adjusted by matching the titanium dioxide with the filler.
In order to optimize the flour spraying method to improve the smoothness of the surface layer and further improve the adhesive force, the preferable technical scheme is as follows: the spraying of flour is 2~4, and the spraying direction of the spraying of the front and back is criss-cross. The spraying direction refers to the direction of relative movement between the workpiece and the spray head. Furthermore, the number of spraying channels of the base powder is 1, and the number of spraying channels of the flour is 2-3.
In order to balance the powder supply amount, optimize the density of each coating and prevent the powder agglomeration phenomenon and the orange peel phenomenon, the preferable technical scheme is as follows: and the vulcanization pressure of the powder barrels of the base powder and the flour is 0.16-0.20 MPa. Furthermore, the vulcanization pressure of the powder barrels of the base powder and the flour is 0.17-0.20 MPa.
In order to fully react and solidify the groups between the base powder and the flour, the preferable technical scheme is as follows: the curing temperature is 190-210 ℃, and the curing time is 15-20 min. Furthermore, the curing temperature is 200-210 ℃, and the curing time is 17-20 min. The time of the leveling stage of the base powder and the flour is shortened when the curing temperature is too high, and the base powder is converted from a molten state to a solid state too quickly, so that the base powder cannot be well leveled and is crosslinked with a flour layer to be cured into a film, and the color difference and the adhesive force of the film are negatively influenced.
In order to form a concave-convex combined surface with relatively uniform convex and concave parts between the base powder coating and the surface powder coating and increase the adhesive force between the coatings, the preferable technical scheme is as follows: the particle size of the base powder is 38-42 mu m, and the particle size of the flour is 39-41 mu m.
In order to further optimize the corrosion resistance of the coating and optimize the thickness of the base powder coating and the flour coating to improve the adhesion, the preferable technical scheme is as follows: the thickness of the base powder coating is 20-30 mu m, and the thickness of the flour coating is 70-90 mu m. Furthermore, the thickness of the base powder coating is 20-25 μm, and the thickness of the flour coating is 70-80 μm.
The preferable technical scheme is as follows: the trademark of the base powder is PCFC90673-JY of PPG industrial coating Suzhou Limited company; the flour is sold under the brand name Acksonobel coatings Co., Ltd, H419083C 25J.
The invention has the advantages and beneficial effects that:
1. the base powder and the flour both contain the graining agent, the graining agent in the flour accounts for a large percentage of the total mass of the flour, the flour coating is firstly heated and cured, and convex and concave sand grains are formed on the interface of the flour and the base powder, so that the interface area of the base powder and the flour is larger than the coating area, the adhesive force between the base powder coating and the flour coating is increased, the adhesion between the coatings is tighter, and the orange peel phenomenon is reduced;
2. the functional group hydroxyl of the polyester resin in the flour can react with the functional group epoxy of the epoxy resin in the base powder to be crosslinked and cured, so that the adhesive force between the base powder coating and the flour coating is improved.
Detailed Description
The following further describes embodiments of the present invention with reference to examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The powder spraying process comprises base powder and flour, wherein the base powder comprises 30 parts of epoxy resin, 30 parts of polyurethane resin, 0.2 part of sand grain agent, 1 part of bentonite, 0.5 part of polyethylene wax, 20 parts of barium sulfate, 18 parts of titanium dioxide and 0.3 part of pigment in parts by weight; the flour comprises 50 parts of polyurethane resin, 0.5 part of sand grain agent, 1.5 parts of bentonite, 2.5 parts of polyethylene wax, 25 parts of barium sulfate, 20 parts of titanium dioxide and 0.5 part of pigment.
The trademark of base powder is PCFC90673-JY of PPG industrial coating Suzhou Limited company; the flour is sold under the brand name Acksonobel coatings Co., Ltd., H419083C 25J.
The grain diameter of the base powder is 38 mu m, and the grain diameter of the flour is 40 mu m.
The powder spraying process comprises the following steps:
s1: spraying the base powder on the surface of a workpiece to obtain a base powder coating;
s2: spraying flour on the surface of the base powder coating in S1;
s3: baking S2 the surface of the workpiece, solidifying the base powder and the flour;
the number of spraying channels of the base powder is 1, the spraying channels of the flour are 3, and the spraying directions of the front spraying and the rear spraying are criss-cross.
The vulcanizing pressure of the powder barrel for supplying the base powder and the flour is 0.18 Mpa; the spraying voltage of the base powder and the flour is 55 KV;the spraying current of the base powder and the flour is 18 muA; the total gas spraying amount of the base powder and the flour is 4.3Nm3H; the spraying powder yield of the base powder and the flour is 240 g/min; the distance between the spraying distance of the base powder and the spraying distance of the flour and the workpiece is 18 cm; the speed of the conveyor chain was 3.5 m/min.
The powder is heated by hot air circulation generated by burning natural gas, the curing temperature is 200 ℃, and the curing time is 18 min.
The thickness of the primer coating was 24 μm and the thickness of the flour coating was 76 μm.
Example 2
Example 2 is based on example 1 with the difference that the flour is sprayed in 2 passes, the spraying directions of the front spraying and the rear spraying are criss-cross, the flour spraying amount is 360g/min, and the thickness of the flour coating is 72 μm.
Example 3
Example 3 is based on example 2, with the difference that the flour is sprayed in 2 passes, the spraying directions of the front spraying and the rear spraying are criss-cross, the flour spraying amount is 240g/min, and the thickness of the flour coating is 48 μm.
Example 4
Example 4 is based on example 1 with the difference that the flour is sprayed only 3 times longitudinally. The thickness of the flour coating was 76 μm.
Example 5
Example 5 is based on example 1 with the difference that the curing temperature is 220 ℃.
Example 6
Example 6 is based on example 1 with the difference that the powder barrel vulcanization pressures for both the base powder and the flour are 0.15 Mpa.
Comparative example
The comparative example is based on example 1, except that the flour was made under the trademark PPG Industrial paint, Suzhou Limited PCT99125C, and the composition did not contain a graining agent.
The detection method of the sample comprises the following steps:
1. the film thickness was measured according to test standard QB/T13452.2-2008 with an ElektroPhysik film thickness gauge F1.5;
2. determining the adhesive force according to a test standard ASTM D3359-2009 (the adhesive force is 0-5B, 6 grades in total, 5B adhesive force is the best, and 0B adhesive force is the worst);
3. measuring the glossiness according to the test standard GB/T9754-1988, wherein the glossiness measuring instrument is a VGG-60 glossiness instrument MG 6-S1;
4. determining hardness according to test standard GB/T6739-2006;
5. and (3) detecting chromatic aberration: the color difference measuring instrument is KONICAMINOLTA Japanese color difference instrument CR-10;
6. and (3) detecting the hardness of the coating: the hardness measuring instrument is A hand pencil hardness tester QHQ-A, and the measuring results of the examples 1-6 and the comparative example are shown in the following table:
| detecting items | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Comparative example |
| Color difference | 0.7 | 0.8 | 2.0 | 1.5 | 3.0 | 1.3 | 0.8 |
| Degree of orange peel | Without orange peel | Without orange peel | Light orange peel | Light orange peel | Without orange peel | Severe orange peel | Without orange peel |
| Adhesion force | 5B | 5B | 4B | 4B | 3B | 3B | 4B |
| Gloss/% | 65 | 64 | 48 | 50 | 45 | 40 | 70 |
| Hardness of | 2H | 2H | 2H | 2H | 3H | 2H | 2H |
In examples 1 and 2, the hammer marks and the film surface of the coating surface are uniform; in examples 3 to 6, the film surface of the coating surface had undulation and uniform hammer marks;
the adhesion between the flour coatings of the comparative examples was reduced compared to the examples without graining agent;
comparing the embodiment 1 with the embodiment 2, the coating thickness of the flour is in the range of 70-90 mu m, and the optimized number of the flour spraying is 2-3;
comparing example 2 and example 3, the smaller the thickness of the coating layer, the appearance of orange peel resulted;
comparing example 1 and example 4, the spraying method of flour affects the appearance and adhesion;
compared with the embodiment 1 and the embodiment 5, the color difference of the film is large due to high curing temperature, the adhesion between coatings is reduced, and the film is too large in hardness and easy to be brittle;
in comparison with examples 1 and 6, the barrel vulcanization pressure of the base powder and the flour was reduced, which negatively affected both the coating process and the product quality.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A powder spray coating process comprising the steps of:
s1: spraying the base powder on the surface of a workpiece to obtain a base powder coating;
s2: spraying flour on the surface of the base powder coating in S1;
s3: baking S2 the surface of the workpiece, solidifying the base powder and the flour;
the base powder is characterized by mainly comprising epoxy resin, polyurethane resin, a sand grain agent, an auxiliary agent and a filler; the flour mainly comprises polyurethane resin, a graining agent, an auxiliary agent and a filler; the percentage content of the sand grain agent in the base powder in the total mass of the base powder is less than the percentage content of the sand grain agent in the flour in the total mass of the flour.
2. The powder spray coating process of claim 1, wherein the additive comprises bentonite, and the mass ratio of the grit agent to the bentonite in the base powder is 1: (3-6); the mass ratio of the sand grain agent to the bentonite in the flour is 1: (2-4).
3. The powder spray coating process of claim 2, wherein the additive further comprises polyethylene wax, and the mass ratio of the sand texturing agent to the polyethylene wax in the flour is 1: (2-5); the mass ratio of the sand grain agent to the polyethylene wax in the base powder is 1: (4-6).
4. The powder spraying process according to claim 3, wherein the flour and the base powder both comprise pigments, and the base powder mainly comprises, by mass, 25-40 parts of epoxy resin, 20-35 parts of polyurethane resin, 0.1-0.3 part of sand grain agent, 0.5-1.5 parts of bentonite, 0.2-0.7 part of polyethylene wax, 15-25 parts of filler and 15-25 parts of pigment; the flour mainly comprises 40-60 parts of polyurethane resin, 0.5-0.8 part of sand grain agent, 1-2 parts of bentonite, 2-4 parts of polyethylene wax, 15-30 parts of filler and 10-25 parts of pigment.
5. The powder spraying process according to claim 1, wherein the flour is sprayed for 2-4 times, and the spraying directions of the front spraying and the rear spraying are criss-cross.
6. The powder spraying process according to claim 1, wherein the vulcanization pressures of the powder barrels of the base powder and the flour are both 0.16-0.20 MPa.
7. The powder spray coating process according to claim 1, wherein the curing temperature is 190 to 210 ℃ and the curing time is 15 to 20 min.
8. The powder spray coating process according to claim 1, wherein the particle size of the base powder is 38-42 μm, and the particle size of the flour is 39-41 μm.
9. The powder spray coating process of claim 7, wherein the primer coating thickness is 20-30 μ ι η and the flour coating thickness is 70-90 μ ι η.
10. The powder spray process of claim 1, wherein the base powder is available under the trademark PPG industrial paint suzhou limited PCFC 90673-JY; the flour is sold under the brand name Acksonobel coatings Co., Ltd, H419083C 25J.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113667386A (en) * | 2021-09-17 | 2021-11-19 | 黄山华佳表面科技股份有限公司 | Powder coating with two coating layers and one baking layer and preparation method thereof |
| CN114887854A (en) * | 2022-05-18 | 2022-08-12 | 广东景元设备有限公司 | Powder spraying process for container |
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| CN113667386A (en) * | 2021-09-17 | 2021-11-19 | 黄山华佳表面科技股份有限公司 | Powder coating with two coating layers and one baking layer and preparation method thereof |
| CN114887854A (en) * | 2022-05-18 | 2022-08-12 | 广东景元设备有限公司 | Powder spraying process for container |
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