CN117259154A - Low-VOC-emission automobile body coating structure and preparation method thereof - Google Patents
Low-VOC-emission automobile body coating structure and preparation method thereof Download PDFInfo
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- CN117259154A CN117259154A CN202311219980.XA CN202311219980A CN117259154A CN 117259154 A CN117259154 A CN 117259154A CN 202311219980 A CN202311219980 A CN 202311219980A CN 117259154 A CN117259154 A CN 117259154A
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- 238000000576 coating method Methods 0.000 title claims abstract description 178
- 239000011248 coating agent Substances 0.000 title claims abstract description 164
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 238000005507 spraying Methods 0.000 claims abstract description 219
- 239000000843 powder Substances 0.000 claims abstract description 140
- 238000001035 drying Methods 0.000 claims abstract description 62
- 239000002987 primer (paints) Substances 0.000 claims abstract description 60
- 239000002966 varnish Substances 0.000 claims abstract description 58
- 238000000034 method Methods 0.000 claims abstract description 40
- 238000005498 polishing Methods 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 86
- 239000003973 paint Substances 0.000 claims description 50
- 239000007921 spray Substances 0.000 claims description 44
- 229940098458 powder spray Drugs 0.000 claims description 10
- 238000007517 polishing process Methods 0.000 claims description 5
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 3
- 229910000077 silane Inorganic materials 0.000 claims description 3
- 150000003754 zirconium Chemical class 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000001962 electrophoresis Methods 0.000 abstract description 43
- -1 drying Substances 0.000 abstract description 2
- 239000012855 volatile organic compound Substances 0.000 abstract 4
- 238000005406 washing Methods 0.000 description 45
- 239000002245 particle Substances 0.000 description 44
- 239000000428 dust Substances 0.000 description 26
- 239000007787 solid Substances 0.000 description 25
- 239000007788 liquid Substances 0.000 description 20
- 230000008569 process Effects 0.000 description 17
- 238000005238 degreasing Methods 0.000 description 16
- 238000000108 ultra-filtration Methods 0.000 description 14
- 239000008235 industrial water Substances 0.000 description 10
- 238000004140 cleaning Methods 0.000 description 9
- 238000007730 finishing process Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- 244000137852 Petrea volubilis Species 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- HOPSCVCBEOCPJZ-UHFFFAOYSA-N carboxymethyl(trimethyl)azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CC(O)=O HOPSCVCBEOCPJZ-UHFFFAOYSA-N 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
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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
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
-
- 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
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
- B05D5/061—Special surface effect
-
- 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
- B05D7/26—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 synthetic lacquers or varnishes
-
- 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
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/586—No clear coat specified each layer being cured, at least partially, separately
-
- 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
- B05D2451/00—Type of carrier, type of coating (Multilayers)
-
- 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
- B05D2501/00—Varnish or unspecified clear coat
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention provides a low VOC (volatile organic compound) emission coating structure of an automobile body, which sequentially comprises a powder primer coating, a middle coating and a powder varnish coating from inside to outside. The low-VOC-emission automobile body coating structure sequentially comprises the powder primer coating, the middle coating and the powder varnish coating from inside to outside, compared with the prior art, the electrophoresis coating is reduced, the zero-VOC-emission powder primer is adopted to replace electrophoresis and middle coating, the cost is reduced, and the VOC emission is reduced. In addition, the invention also provides a preparation method of the automobile body coating structure with low VOC emission, which comprises the following steps: the method comprises the steps of pre-treating a car body, spraying a primer layer, drying, polishing, spraying an intermediate coating, pre-baking, spraying a varnish coating, drying, and finishing off-line.
Description
Technical Field
The invention relates to the technical field of vehicle body coating, in particular to a low-VOC-emission automobile body coating structure and a preparation method thereof.
Background
The traditional automobile body coating is generally composed of an electrophoresis layer with an anti-corrosion function, a middle coating or BC1 layer with a filling and anti-ultraviolet function, a colored paint or BC2 layer with a color effect, and a varnish coating with an appearance improving and protecting function.
The traditional coating process mainly comprises the following steps: a 3C2B coating process, a 3C1B coating process, a B1B2 coating process, a compact aqueous 3C1B coating process, and the like. The traditional water-based 3C2B coating process is developed from solvent-based coating processes, 3C refers to intermediate coating, color paint and varnish spraying, and 2B refers to intermediate coating and finish drying. The water-based 3C1B coating process is also called 3wet, the middle coating drying and middle coating polishing process is omitted on the basis of the 3C2B coating process, and the middle coating hot air flash drying process is replaced, so that the process length is greatly shortened, and the equipment investment and the production capital are reduced. With the development of material technology, the process of flash drying of the middle coating is canceled on the basis of 3C1B, the water-based middle-coating-free coating process is developed, the BC1 with the same function is replaced, and the BC1 and the BC2 are completely sprayed in a 'wet-on-wet' manner. The aqueous middle-coating-free process is named as 2C1B, B1B2 and the like.
Although these processes meet existing emission regulations, VOC regulations are becoming more and more stringent worldwide, and therefore, it is necessary to develop a lower VOC emission automotive coating process.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the automobile body coating structure with low VOC emission and the preparation method thereof, which greatly reduce the VOC emission of the automobile coating process.
To achieve the above object, in a first aspect, the present invention provides a low VOC emission automotive body coating structure comprising, in order from inside to outside, a powder primer coating, a middle coating, and a powder varnish coating.
Preferably, the intermediate coating is formed by spraying one of water-based pearl paint, water-based metallic paint and water-based colored paint.
Preferably, the film thickness of the powder primer coating is 60-80 μm.
Preferably, the film thickness of the powder varnish coating is 60-80 μm.
Preferably, the film thickness of the intermediate coating is 10-20 μm.
In a second aspect, the present invention also provides a method for preparing a low VOC emission automotive body coating structure, comprising the steps of:
pre-treating the vehicle body; spraying, drying and polishing the powder primer coating; spraying and pre-baking the intermediate coating; and (5) spraying and drying the powder varnish coating, and finishing off-line.
Preferably, the powder primer coating spraying, drying and polishing process specifically comprises the following steps: conveying the automobile body to be coated into a powder spraying room, and carrying out powder spraying to ensure that the thickness of a primer coating is 60-80 mu m; and then baking, and entering a primer polishing procedure after the powder primer is dried and solidified.
Preferably, the powder varnish coating spraying and drying process specifically comprises the following steps: the automobile body to be subjected to varnish coating is conveyed into a powder spray booth, subjected to powder spraying so that the thickness of the varnish coating is 60-80 mu m, and then baked.
Preferably, the intermediate coating spraying and pre-baking comprises the following steps: and (3) spraying a coating on the surface of the automobile body, wherein the coating is one of water-based pearlescent paint, water-based metallic paint and water-based colored paint, the thickness of the intermediate coating is controlled to be 10-20 mu m, and the intermediate coating enters pre-baking after being sprayed.
Preferably, the mode of pre-treating the vehicle body is selected from one of phosphating pretreatment, silane pretreatment and zirconium salt pretreatment.
Compared with the prior art, the invention has the advantages that:
(1) The low-VOC-emission automobile body coating structure sequentially comprises the powder primer coating, the middle coating and the powder varnish coating from inside to outside, compared with the prior art, the electrophoresis coating is reduced, the zero-VOC-emission powder primer is adopted to replace the electrophoresis coating and the middle coating, so that the cost is reduced, and the VOC emission is reduced.
(2) The automobile body coating structure with low VOC emission can also improve the protection performance such as stone-strike resistance and the like.
(3) The invention adopts the powder primer to replace the traditional electrophoretic coating, and can improve the anti-corrosion performance of the automobile body outer plate to a certain extent.
(4) The low-VOC-emission automobile body coating process provided by the invention can further save energy consumption (such as bath solution heating and electrophoresis drying) in the electrophoresis process due to the reduction of electrophoresis procedures, and can also avoid water consumption and sewage discharge in the electrophoresis process, so that the automobile body surface coating preparation process is more environment-friendly.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a coating structure of an automotive body according to an embodiment of the present invention;
in the figure: 1-automobile body, 2-powder primer coating, 3-intermediate coating, 4-powder clearcoat.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides an automobile body coating structure and a preparation method thereof, wherein the automobile body coating structure sequentially comprises a powder primer coating, a middle coating and a powder varnish coating from inside to outside, compared with the prior art, the electrophoresis coating is reduced, the powder primer with zero VOC emission is adopted to replace electrophoresis and middle coating, and the technical problem of high VOC emission in the automobile body coating process in the prior art is solved.
In order to achieve the technical effects, the general idea of the invention is as follows:
in a first aspect, referring to fig. 1, the present invention provides an automotive body coating structure comprising, in order from inside to outside, a powder primer coating 2, an intermediate coating 3, and a powder clear coat coating 4.
The low-VOC-emission automotive body coating structure of the embodiment of the invention sequentially comprises the powder primer coating 2, the middle coating 3 and the powder varnish coating 4 from inside to outside, compared with the prior art, the electrophoretic coating is reduced, and the powder primer coating with zero VOC emission is adopted to replace the electrophoretic coating and the middle coating, so that the cost is reduced, and the VOC emission is reduced.
Preferably, the intermediate coating 3 is sprayed by one paint of water-based pearl paint, water-based metallic paint and water-based colored paint. The middle coating 3 is formed by spraying one of water-based pearl paint, water-based metallic paint and water-based colored paint, so that the VOC emission can be further reduced.
Preferably, the film-forming thickness of the powder primer coating 2 is 60 to 80 μm. Setting the film-forming thickness of the primer coating 2 to 60 to 80 μm can improve the corrosion resistance of the coating while achieving a better appearance.
Preferably, the film thickness of the powder varnish coating 4 is 60-80 μm. Setting the film-forming thickness of the powder varnish coating 4 to 60 to 80 μm can improve the protective properties of the coating structure, such as stone chip resistance and the like, while achieving a better appearance.
Preferably, the film thickness of the intermediate coating 3 is 10-20 μm.
In a second aspect, the invention also provides a preparation method of the automobile body coating structure, which comprises the following steps:
the method comprises the steps of pre-treating a car body, spraying a powder primer coating, drying, polishing, spraying an intermediate coating, pre-baking, spraying a powder varnish coating, drying, and finishing off line.
Preferably, the powder primer coating spraying, drying and polishing process comprises the following steps:
conveying the automobile body to be coated into a powder spraying room, and carrying out powder spraying to ensure that the thickness of a primer coating is 60-80 mu m; and then baking, and entering a primer polishing procedure after the powder primer is dried and solidified.
Preferably, the powder primer coating spraying, drying and polishing process specifically comprises the following steps:
(1) The wind direction of the powder spraying room is set to be vertical downwards, the wind speed is less than or equal to 0.2m/s, the temperature is less than or equal to 25 ℃, and the humidity is: 40-60%; the wind speed is set to be less than or equal to 0.2m/s, so that the uniformity of the thickness of a paint film can be ensured, and powder condensation is avoided;
(2) Conveying the coated automobile body into a powder spraying room, and spraying equipment: the voltage of the electrostatic air spray gun/rotary cup is 50-70KV, the air pressure is more than or equal to 5Bar, and the film thickness is required to be 60-80 mu m;
(3) Then baking at 160-180 ℃ for 15-30min, and entering a primer polishing procedure after the powder primer is dried and solidified.
Preferably, before spraying, the powder primer coating further comprises the following steps: clear up the powder in the powder spray booth, guarantee in every cubic meter of air: no dust particles with the particle size of more than or equal to 5 mu m, and the number of dust particles with the particle size ranging from 0.5 mu m to 5 mu m is not more than 30000;
preferably, the intermediate coating spraying and pre-baking process comprises the following steps:
spraying a coating on the surface of an automobile body, wherein the coating is one of water-based pearly paint, water-based metallic paint and water-based colored paint, the thickness of the intermediate coating is controlled to be 10-20 mu m, and the intermediate coating enters pre-baking after being sprayed;
preferably, the spraying of the intermediate coating adopts an electrostatic rotary cup spray gun for spraying, and the spraying process specifically comprises the following steps: spraying temperature: 23-27 ℃, spraying humidity: 60-80%, wind speed: 0.4-0.5 m/s, coating pressure: 0.6-1.0Mpa, electrostatic gun air pressure: 0.3-0.6MPa. The stable color and appearance quality can be ensured by adopting the parameters to spray the intermediate coating;
preferably, the pre-baking step specifically includes: after the intermediate coating is sprayed, leveling for 3-5 minutes at normal temperature, then pre-baking, heating to 100-150 ℃ for 2-5 minutes during pre-baking, baking for 2-5 minutes, cooling for 1-3 minutes, and then entering a powder varnish spraying area.
Preferably, the powder varnish coating spraying process specifically comprises the following steps: firstly, cleaning powder in a powder spraying room, and then conveying an automobile body to be coated into the powder spraying room for spraying.
Preferably, the cleaning of the powder in the powder spraying room specifically includes the following steps:
(1) Clear up the powder in the powder spray booth, guarantee in every cubic meter of air: no dust particles with the particle size of more than or equal to 5 mu m, and the number of dust particles with the particle size ranging from 0.5 mu m to 5 mu m is not more than 30000;
(2) The wind direction of the powder spraying room is set to be vertical downwards, the wind speed is less than or equal to 0.2m/s, the temperature is less than or equal to 25 ℃, and the humidity is: 40-60%. The wind speed is less than 0.2m/s on the surface of the vehicle body so as to ensure that the powder spraying can be well sprayed on the vehicle body.
Preferably, the specific process steps for conveying the coated automobile body into a powder spray booth for spraying comprise: selecting a spraying device: the static air spray gun or rotary cup is provided with voltage of 50-70KV, air pressure is more than or equal to 5Bar, and film thickness is required to be 60-80 mu m.
Preferably, the baking process of the varnish coating comprises the following steps: baking at 160-180deg.C for 15-30min, and for high-gloss powder varnish: the appearance satisfies: D0I is more than or equal to 85, gloss (20 degrees) is more than or equal to 85, LW H is less than or equal to 5, LW V is less than or equal to 10. For a matte powder varnish: gloss (20 degrees) is less than or equal to 20.
Preferably, the powder varnish enters a finishing process after being dried and solidified.
Preferably, the mode of pretreatment of the vehicle body is selected from one of phosphating pretreatment, silane pretreatment and zirconium salt pretreatment.
Preferably, the phosphating pretreatment comprises the following steps: pre-washing, pre-degreasing, washing, surface adjustment, phosphating and washing.
Preferably, the water washing between degreasing and surface conditioning comprises a first water washing and a second water washing; the water washing after phosphating comprises a third water washing, a fourth water washing, a circulating pure water washing and a fresh pure water washing.
The specific steps of pre-washing comprise: industrial water at 30-50 deg.c is used to spray the automobile body for 20-30s at 0.05-0.15MPa.
The specific steps of pre-degreasing include: the pre-degreasing bath liquid is adopted to spray the automobile body, the spraying time is 30-60s, the spraying pressure is 0.2-0.3MPa, the temperature of the pre-degreasing bath liquid is 40-50 ℃, and the pH value of the pre-degreasing bath liquid is 12-14.
The degreasing method specifically comprises the following steps: immersing the automobile body in degreasing bath solution with pH value of 12-14 for 180-240s, circulating surface flow pressure of 0.08-0.12MPa, and degreasing bath solution temperature of 40-50deg.C.
The specific steps of the first water washing include: immersing the automobile body in industrial water for 120-150s, wherein the spraying pressure is 0.23-0.27MPa when the automobile body is immersed and when the automobile body is immersed.
The specific steps of the second water washing include: industrial water is adopted to spray the automobile body, the spraying time is 20-30s, and the spraying pressure is 0.23-0.31MPa.
The specific steps of the surface adjustment include: immersing the automobile body in the surface regulating bath solution with the pH value of 9.5-10.5 for 60-120s, wherein the temperature of the surface regulating bath solution is 25-35 ℃.
The specific steps of phosphating include: immersing the automobile body into a phosphating bath solution with the ratio of total acid to free acid of 20-25, wherein the immersing time is 180-240s, the surface flow spraying pressure of the phosphating bath solution is 0.02-0.06MPa, and the temperature of the phosphating bath solution is 40-45 ℃; after phosphating, the automobile body needs to be ensured: the phosphating crystal size is less than or equal to 10 mu m, the coverage rate is more than or equal to 85 percent, and the weight of phosphating film on the surface of the cold-rolled steel plate is 2-3 g/m 2 The weight of the phosphating film on the surface of the galvanized steel sheet is 2-5 g/m 2 。
The specific steps of the third water washing include: immersing the automobile body in industrial water for 120-150s, wherein the spraying pressure is 0.1-0.3MPa when the automobile body is immersed and when the automobile body is immersed.
The specific steps of the fourth water washing include: industrial water is adopted to spray the automobile body, the spraying time is 20-30s, and the spraying pressure is 0.1-0.2MPa.
The specific steps of the circulating pure water washing include: immersing the automobile body in pure water with the conductivity less than or equal to 20 mu S/cm for 120-150S, wherein the spraying pressure is 0.1-0.3MPa when the automobile body is immersed and when the automobile body is immersed.
The specific steps of fresh pure water washing include: pure water with the conductivity less than or equal to 5 mu S/cm is adopted to spray an automobile body, the spraying time is 20-30S, the spraying pressure is 0.15-0.25MPa, the spraying flow is 70-130L/min, and the conductivity of the drip water of the automobile body is less than or equal to 50 mu S/cm.
The coating structure of the present invention and the method of producing the coating structure are described below by way of specific examples.
Example 1
(1) Pretreatment is carried out on the vehicle body in a phosphating pretreatment mode:
a. pre-washing: industrial water with the temperature of 30 ℃ is adopted to spray the automobile body, the spraying time is 30s, and the spraying pressure is 0.15MPa.
b. Pre-degreasing: the pre-degreasing bath liquid is adopted to spray the automobile body, the spraying time is 30s, the spraying pressure is 0.3MPa, the temperature of the pre-degreasing bath liquid is 50 ℃, and the pH value of the pre-degreasing bath liquid is 14.
c. Degreasing: the automobile body is immersed in degreasing bath liquid with the pH value of 14 for 240s, the circulation pressure of surface flow is 0.12MPa, and the temperature of the degreasing bath liquid is 50 ℃.
d. Washing with water for the first time: the automobile body is immersed in industrial water for 150s, and the spraying pressure is 0.27MPa when the automobile body is immersed and when the automobile body is immersed.
e. And (3) washing with water for the second time: industrial water is adopted to spray the automobile body, the spraying time is 30s, and the spraying pressure is 0.31MPa.
f. Surface adjustment: the automobile body is immersed in a surface adjusting bath solution with the pH value of 10.5 for 120s, and the temperature of the surface adjusting bath solution is 35 ℃.
g. Phosphating: immersing a motor vehicle body in total acidIn a phosphating bath solution with the free acid ratio of 25, the soaking time is 1240s, the surface flow spray pressure of the phosphating bath solution is 0.06MPa, and the temperature of the phosphating bath solution is 45 ℃; after phosphating, the automobile body needs to be ensured: the phosphating crystal size is less than or equal to 10 mu m, the coverage rate is more than or equal to 85 percent, and the weight of phosphating film on the surface of the cold-rolled steel plate is 2-3 g/m 2 The weight of the phosphating film on the surface of the galvanized steel sheet is 2-5 g/m 2 。
h. And (3) washing with water for the third time: the automobile body is immersed in industrial water for 150s, and the spraying pressure is 0.3MPa when the automobile body is immersed and when the automobile body is immersed.
i. Fourth water washing: industrial water is adopted to spray the automobile body, the spraying time is 30s, and the spraying pressure is 0.2MPa.
j. And (3) circulating pure water washing: the automobile body is immersed into pure water with the conductivity less than or equal to 20 mu S/cm, the immersing time is 150S, and the spraying pressure is 0.3MPa when the automobile body is immersed and when the automobile body is immersed.
k. Fresh pure water washing: pure water with the conductivity less than or equal to 5 mu S/cm is adopted to spray an automobile body, the spraying time is 30S, the spraying pressure is 0.25MPa, the spraying flow is 130L/min, and the conductivity of the automobile body drip water is less than or equal to 50 mu S/cm.
(2) Spraying, drying and polishing the powder primer coating:
a. cleaning a powder spraying room: dust in the powder spraying room is cleaned, and the air of every cubic foot is ensured: no dust particles with the particle size of more than or equal to 5 mu m, and the number of dust particles with the particle size ranging from 0.5 mu m to 5 mu m is not more than 30000;
b. and (3) spraying a primer coating: the wind direction of the powder spraying room is set to be vertically downward, the wind speed is 0.2m/s, the temperature is 25 ℃, and the humidity is as follows: 50%; conveying the coated automobile body into a powder spraying room, and spraying equipment: the electrostatic air spray gun/rotary cup has the voltage of 65KV, the air pressure of 5Bar and the film thickness of 63 μm;
c. and (3) drying: baking at 180 ℃ for 15min, drying and solidifying the powder primer, and then entering a primer polishing procedure.
d. Polishing.
(3) Spraying and pre-baking the intermediate coating water-based solid white paint:
a. and (3) spraying an intermediate coating: adopting an electrostatic rotary cup spray gun to spray water-based solid white paint on the surface of an automobile body, wherein the spraying temperature is as follows: 25 ℃, spraying humidity: 70%, wind speed: 0.5m/s, paint pressure: 0.8Mpa, electrostatic gun air pressure: 0.4MPa, and controlling the film thickness to be 16 μm.
b. Pre-baking: after the intermediate coating is sprayed, leveling for 5 minutes at normal temperature, pre-baking, heating to 120 ℃ for 2 minutes during pre-baking, baking for 5 minutes, cooling for 3 minutes, and entering a powder varnish spraying area.
(4) And (3) spraying and drying a powder varnish coating:
a. and (3) spraying a varnish coating: timely clear up the powder in the powder spray booth, guarantee in every cubic meter of air: no dust particles with the particle size of more than or equal to 5 mu m, and the number of dust particles with the particle size ranging from 0.5 mu m to 5 mu m is not more than 30000; the wind direction of the powder spraying room is set to be vertically downward, the wind speed is 0.2m/s, the temperature is 25 ℃, and the humidity is as follows: 50%;
conveying the coated automobile body into a powder spraying room, and spraying equipment: electrostatic air spray gun/rotary cup, voltage 65KV, air pressure 5Bar and film thickness 65 μm.
b. And (3) drying: baking at 180deg.C for 15 min.
(5) And (5) drying and solidifying the powder varnish, and then entering a finishing process.
Example 2
(1) The vehicle body was subjected to pretreatment by phosphating pretreatment (the same as in example 1).
(2) Spraying, drying and polishing a primer layer:
a. cleaning a powder spraying room: dust in the powder spraying room is cleaned, and the air of every cubic foot is ensured: no dust particles with the particle size of more than or equal to 5 mu m, and the number of dust particles with the particle size ranging from 0.5 mu m to 5 mu m is not more than 30000;
b. and (3) spraying a primer layer: the wind direction of the powder spraying room is set to be vertically downward, the wind speed is 0.1m/s, the temperature is 25 ℃, and the humidity is as follows: 50%; conveying the coated automobile body into a powder spraying room, and spraying equipment: the electrostatic air spray gun/rotary cup has the voltage of 65KV, the air pressure of 5Bar and the film thickness of 71 μm;
c. and (3) drying: baking at 180 ℃ for 15min, drying and solidifying the powder primer, and then entering a primer polishing procedure.
d. Polishing.
(3) Spraying and pre-baking the intermediate coating water-based solid white paint:
a. and (3) spraying an intermediate coating: adopting an electrostatic rotary cup spray gun to spray water-based solid white paint on the surface of an automobile body, wherein the spraying temperature is as follows: 25 ℃, spraying humidity: 70%, wind speed: 0.5m/s, paint pressure: 0.8Mpa, electrostatic gun air pressure: 0.4MPa, and controlling the film thickness to be 16 μm.
b. Pre-baking: after the intermediate coating is sprayed, leveling for 5 minutes at normal temperature, pre-baking, heating to 120 ℃ for 2 minutes during pre-baking, baking for 5 minutes, cooling for 3 minutes, and entering a powder varnish spraying area.
(4) And (3) spraying and drying a powder varnish coating:
a. and (3) spraying a varnish coating: timely clear up the powder in the powder spray booth, guarantee in every cubic meter of air: no dust particles with the particle size of more than or equal to 5 mu m, and the number of dust particles with the particle size ranging from 0.5 mu m to 5 mu m is not more than 30000; setting the wind direction of the powder spraying room to be vertically downward, wherein the wind speed is 0.1m/s, the temperature is 25 ℃, and the humidity is 50%;
conveying the coated automobile body into a powder spraying room, and spraying equipment: the voltage of the electrostatic air spray gun/rotary cup is 65KV, the air pressure is 5Bar, and the film thickness is 69 mu m.
b. And (3) drying: baking at 180deg.C for 15 min.
(5) And (5) drying and solidifying the powder varnish, and then entering a finishing process.
Example 3
(1) The vehicle body was subjected to pretreatment by phosphating pretreatment (the same as in example 1).
(2) Spraying, drying and polishing a primer layer:
a. and (3) spraying a primer layer: the wind direction of the powder spraying room is set to be vertically downward, the wind speed is 0.1m/s, the temperature is 25 ℃, and the humidity is as follows: 50%; conveying the coated automobile body into a powder spraying room, and spraying equipment: the voltage of the electrostatic air spray gun/rotary cup is 50KV, the air pressure is 5Bar, and the film thickness is required to be 78 mu m;
b. and (3) drying: baking at 180 ℃ for 15min, drying and solidifying the powder primer, and then entering a primer polishing procedure.
c. Polishing.
(3) Spraying and pre-baking the intermediate coating water-based solid white paint:
a. and (3) spraying an intermediate coating: adopting an electrostatic rotary cup spray gun to spray water-based solid white paint on the surface of an automobile body, wherein the spraying temperature is as follows: 25 ℃, spraying humidity: 70%, wind speed: 0.5m/s, paint pressure: 0.8Mpa, electrostatic gun air pressure: 0.4MPa, and controlling the film thickness to be 16 μm.
b. Pre-baking: after the intermediate coating is sprayed, leveling for 5 minutes at normal temperature, pre-baking, heating to 120 ℃ for 2 minutes during pre-baking, baking for 5 minutes, cooling for 3 minutes, and entering a powder varnish spraying area.
(4) And (3) spraying and drying a powder varnish coating:
a. and (3) spraying a varnish coating: timely clear up the powder in the powder spray booth, guarantee in every cubic meter of air: no dust particles with the particle size of more than or equal to 5 mu m, and the number of dust particles with the particle size ranging from 0.5 mu m to 5 mu m is not more than 30000; setting the wind direction of the powder spraying room to be vertically downward, wherein the wind speed is 0.1m/s, the temperature is 25 ℃, and the humidity is 50%;
conveying the coated automobile body into a powder spraying room, and spraying equipment: electrostatic air spray gun/rotary cup, voltage 50KV, air pressure 5Bar and film thickness 76 μm.
b. And (3) drying: baking at 180deg.C for 15 min.
(5) And (5) drying and solidifying the powder varnish, and then entering a finishing process.
Comparative example 1
(1) The vehicle body was subjected to pretreatment by phosphating pretreatment (the same as in example 1).
(2) Electrophoresis:
a. electrophoresis: immersing the automobile body into an electrophoresis tank liquid with the pH value of 6, the conductivity of 1800 mu S/cm, the throwing power of more than or equal to 60 percent and the solvent content of less than or equal to 2 percent, wherein the temperature of the electrophoresis tank liquid is 31 ℃, the solid content of the electrophoresis tank liquid is 20 percent, the ash content of the electrophoresis tank liquid is 16 percent, the electrophoresis process is controlled by adopting two-stage voltage steps, the first-stage voltage is 200V, the second-stage voltage is 240V, and the electrifying time of the electrophoresis process is 220S;
b. washing with ultrafiltration water for the first time: the electrophoresis ultrafiltration washing tank liquor is adopted to spray the automobile body, the spraying time is 25s, and the spraying pressure is 0.1MPa;
c. and (3) performing ultrafiltration water washing for the second time: immersing the automobile body into the electrophoresis ultrafiltration washing tank liquid for 140s, wherein the spraying pressure is 0.1MPa when the automobile body is immersed and when the automobile body is immersed, and the solid content of the electrophoresis ultrafiltration washing tank liquid is less than or equal to 2%;
d. and (3) ultrafiltration water washing for the third time: the electrophoresis ultrafiltration washing tank liquor is adopted to spray the automobile body, the spraying time is 25s, and the spraying pressure is 0.1MPa;
e. first circulating pure water washing: pure water with the solid content less than or equal to 0.5% is adopted to spray the automobile body, the spraying time is 25s, and the spraying pressure is 0.1MPa;
f. and (3) washing with circulating pure water for the second time: immersing the automobile body in pure water with the solid content less than or equal to 0.5%, wherein the immersing time is 150s, and the spraying pressure is 0.08MPa when the automobile body is immersed and when the automobile body is immersed;
g. fresh pure water washing: pure water is adopted to spray the automobile body, the spraying time is 25s, the spraying pressure is 0.1MPa, and the spraying flow is 90L/min; the thickness of the electrophoretic coating after electrophoresis satisfies the following conditions: the thickness of the electrophoretic coating on the outer surface of the vehicle body is more than or equal to 15 mu m, and the thickness of the electrophoretic coating on the inner cavity of the vehicle body is more than or equal to 10 mu m;
h. and (3) electrophoresis drying: drying the automobile body at 165 ℃ for 25min; the thickness of the electrophoretic coating meets the following conditions: the thickness of the electrophoretic coating on the outer surface of the vehicle body is 18 mu m;
i. and (3) electrophoresis polishing: and polishing the electrophoresis defect by adopting sand paper.
(3) Aqueous intercoat:
a. aqueous mid-coat cleaning: the cleaning chamber is cleaned before the intermediate coating, the temperature of the cleaning chamber is 25 ℃, the humidity is 70%, and the wind speed is 0.2m/s;
b. aqueous intercoat spray coating: after the intermediate coating is finished, the intermediate coating spraying is carried out, the chamber temperature is 25 ℃, the humidity is 70%, the wind speed is 0.3m/s, and the spraying film thickness is 12 mu m;
c. naturally flashing for 10min.
(4) Spraying and flashing off the water-based solid white paint:
a. spraying water-based solid white paint: after the intermediate coating spraying is naturally dried for 10min, carrying out water-based solid white paint spraying, wherein the chamber temperature is 25 ℃, the humidity is 70%, the wind speed is 0.3m/s, and the spraying film thickness is 16 mu m;
b. flash drying and dehydration: the water-based solid white paint is sprayed and dried, and the temperature is: flash drying and dewatering at 80 deg.c for 8min.
(5) And (3) a solvent type varnish coating spraying and drying process:
the solvent type varnish spraying is carried out after the water-based solid white paint is flash-dried, the temperature is 25 ℃, the humidity is 70%, the wind speed is 0.3m/s, and the spraying film thickness is 45 mu m;
and after finishing the varnish spraying, drying for 8min, baking the varnish, heating to 160 ℃ for 10min, and preserving heat for 20min.
(6) And (5) drying and solidifying the powder varnish, and then entering a finishing process.
Comparative example 2
(1) The vehicle body was subjected to pretreatment by phosphating pretreatment (the same as in example 1).
(2) Spraying, drying and polishing a primer layer:
a. and (3) spraying a primer layer: the wind direction of the powder spraying room is set to be vertically downward, the wind speed is 0.2m/s, the temperature is 25 ℃, and the humidity is as follows: 50%; conveying the coated automobile body into a powder spraying room, and spraying equipment: the voltage of the electrostatic air spray gun/rotary cup is 50KV, the air pressure is 5Bar, and the film thickness is required to be 52 mu m;
b. and (3) drying: baking at 180 ℃ for 15min, drying and solidifying the powder primer, and then entering a primer polishing procedure.
c. Polishing.
(3) Spraying and pre-baking the intermediate coating water-based solid white paint:
a. and (3) spraying an intermediate coating: adopting an electrostatic rotary cup spray gun to spray water-based solid white paint on the surface of an automobile body, wherein the spraying temperature is as follows: 25 ℃, spraying humidity: 70%, wind speed: 0.5m/s, paint pressure: 0.8Mpa, electrostatic gun air pressure: 0.4MPa, and controlling the film thickness to be 16 μm.
b. Pre-baking: after the intermediate coating is sprayed, leveling for 5 minutes at normal temperature, pre-baking, heating to 120 ℃ for 2 minutes during pre-baking, baking for 5 minutes, cooling for 3 minutes, and entering a powder varnish spraying area.
(4) And (3) spraying and drying a powder varnish coating:
a. and (3) spraying a varnish coating: timely clear up the powder in the powder spray booth, guarantee in every cubic meter of air: no dust particles with the particle size of more than or equal to 5 mu m, and the number of dust particles with the particle size ranging from 0.5 mu m to 5 mu m is not more than 30000; setting the wind direction of the powder spraying room to be vertically downward, wherein the wind speed is 0.1m/s, the temperature is 25 ℃, and the humidity is 50%;
conveying the coated automobile body into a powder spraying room, and spraying equipment: electrostatic air spray gun/rotary cup, voltage 50KV, air pressure 5Bar and film thickness 76 μm.
b. And (3) drying: baking at 180deg.C for 15 min.
(5) And (5) drying and solidifying the powder varnish, and then entering a finishing process.
Comparative example 3
(1) The vehicle body was subjected to pretreatment by phosphating pretreatment (the same as in example 1).
(2) Spraying, drying and polishing a primer layer:
a. and (3) spraying a primer layer: the wind direction of the powder spraying room is set to be vertically downward, the wind speed is 0.2m/s, the temperature is 25 ℃, and the humidity is as follows: 50%; conveying the coated automobile body into a powder spraying room, and spraying equipment: the voltage of the electrostatic air spray gun/rotary cup is 50KV, the air pressure is 5Bar, and the film thickness is required to be 78 mu m;
b. and (3) drying: baking at 180 ℃ for 15min, drying and solidifying the powder primer, and then entering a primer polishing procedure.
c. Polishing.
(3) Spraying and pre-baking the intermediate coating water-based solid white paint:
a. and (3) spraying an intermediate coating: adopting an electrostatic rotary cup spray gun to spray water-based solid white paint on the surface of an automobile body, wherein the spraying temperature is as follows: 25 ℃, spraying humidity: 70%, wind speed: 0.5m/s, paint pressure: 0.8Mpa, electrostatic gun air pressure: 0.4MPa, and controlling the film thickness to be 16 μm.
b. Pre-baking: after the intermediate coating is sprayed, leveling for 5 minutes at normal temperature, pre-baking, heating to 120 ℃ for 2 minutes during pre-baking, baking for 5 minutes, cooling for 3 minutes, and entering a powder varnish spraying area.
(4) And (3) spraying and drying a powder varnish coating:
a. and (3) spraying a varnish coating: timely clear up the powder in the powder spray booth, guarantee in every cubic meter of air: no dust particles with the particle size of more than or equal to 5 mu m, and the number of dust particles with the particle size ranging from 0.5 mu m to 5 mu m is not more than 30000; setting the wind direction of the powder spraying room to be vertically downward, wherein the wind speed is 0.1m/s, the temperature is 25 ℃, and the humidity is 50%;
conveying the coated automobile body into a powder spraying room, and spraying equipment: electrostatic air spray gun/rotary cup, voltage 50KV, air pressure 5Bar and film thickness 50 μm.
b. And (3) drying: baking at 180deg.C for 15 min.
(5) And (5) drying and solidifying the powder varnish, and then entering a finishing process.
Comparative example 4
(1) The vehicle body was subjected to pretreatment by phosphating pretreatment (the same as in example 1).
(2) Electrophoresis:
a. electrophoresis: immersing the automobile body into an electrophoresis tank liquid with the pH value of 6, the conductivity of 1800 mu S/cm, the throwing power of more than or equal to 60 percent and the solvent content of less than or equal to 2 percent, wherein the temperature of the electrophoresis tank liquid is 31 ℃, the solid content of the electrophoresis tank liquid is 20 percent, the ash content of the electrophoresis tank liquid is 16 percent, the electrophoresis process is controlled by adopting two-stage voltage steps, the first-stage voltage is 200V, the second-stage voltage is 240V, and the electrifying time of the electrophoresis process is 220S;
b. washing with ultrafiltration water for the first time: the electrophoresis ultrafiltration washing tank liquor is adopted to spray the automobile body, the spraying time is 25s, and the spraying pressure is 0.1MPa;
c. and (3) performing ultrafiltration water washing for the second time: immersing the automobile body into the electrophoresis ultrafiltration washing tank liquid for 140s, wherein the spraying pressure is 0.1MPa when the automobile body is immersed and when the automobile body is immersed, and the solid content of the electrophoresis ultrafiltration washing tank liquid is less than or equal to 2%;
d. and (3) ultrafiltration water washing for the third time: the electrophoresis ultrafiltration washing tank liquor is adopted to spray the automobile body, the spraying time is 25s, and the spraying pressure is 0.1MPa;
e. first circulating pure water washing: pure water with the solid content less than or equal to 0.5% is adopted to spray the automobile body, the spraying time is 25s, and the spraying pressure is 0.1MPa;
f. and (3) washing with circulating pure water for the second time: immersing the automobile body in pure water with the solid content less than or equal to 0.5%, wherein the immersing time is 150s, and the spraying pressure is 0.08MPa when the automobile body is immersed and when the automobile body is immersed;
g. fresh pure water washing: pure water is adopted to spray the automobile body, the spraying time is 25s, the spraying pressure is 0.1MPa, and the spraying flow is 90L/min; the thickness of the electrophoretic coating after electrophoresis satisfies the following conditions: the thickness of the electrophoretic coating on the outer surface of the vehicle body is more than or equal to 15 mu m, and the thickness of the electrophoretic coating on the inner cavity of the vehicle body is more than or equal to 10 mu m;
h. and (3) electrophoresis drying: drying the automobile body at 165 ℃ for 25min; the thickness of the electrophoretic coating meets the following conditions: the thickness of the electrophoretic coating on the outer surface of the vehicle body is 18 mu m;
i. and (3) electrophoresis polishing: and polishing the electrophoresis defect by adopting sand paper.
(3) Spraying and drying the powder middle coating:
a. cleaning a powder spraying room: dust in the powder spraying room is cleaned, and the air of every cubic foot is ensured: no dust particles with the particle size of more than or equal to 5 mu m, and the number of dust particles with the particle size ranging from 0.5 mu m to 5 mu m is not more than 30000;
b. wind direction, wind speed and temperature and humidity of the powder spraying room are set: the wind direction of the powder spraying room is set to be vertically downward, the wind speed is set to be 0.4m/s, the temperature is set to be 25 ℃, and the humidity is set to be 60%;
c. spraying: conveying an automobile body to be treated into a powder spraying room, spraying powdery colored paint on the surface of the automobile body under the condition of an electrostatic voltage of 65kV, wherein the film forming mode is one-stop spraying film forming, the film forming thickness is 63 mu m, the spraying gun distance is 18cm, and the spraying gun speed is 450mm/s;
d. and (3) drying: the automobile body was baked at 170℃for 25min.
(4) Spraying and pre-baking water-based solid white paint:
a. spraying water-based solid white paint: the temperature of the chamber body is 25 ℃, the humidity is 70%, the wind speed is 0.3m/s, and the thickness of the sprayed film is 16 mu m;
b. pre-baking: and (3) after leveling for 5 minutes at normal temperature, pre-baking, wherein during pre-baking, 2 is heated to 120 ℃, baking is performed for 5 minutes, and then cooling is performed for 3 minutes, and the obtained product enters a varnish spraying area.
(5) Spraying and drying powder varnish:
a. cleaning a powder spraying room: dust in the powder spraying room is cleaned, and the air of every cubic foot is ensured: no dust particles with the particle size of more than or equal to 5 mu m, and the number of dust particles with the particle size ranging from 0.5 mu m to 5 mu m is not more than 30000;
b. wind direction, wind speed and temperature and humidity of the powder spraying room are set: the wind direction of the powder spraying room is set to be vertically downward, the wind speed is set to be 0.4m/s, the temperature is set to be 28 ℃, and the humidity is set to be 65%;
c. spraying: conveying an automobile body to be treated into a powder spraying room, spraying powdery varnish on the surface of the automobile body under the condition that the electrostatic voltage is 63kV, wherein the spraying gun distance is 22cm, the spraying gun speed is 550mm/s, the film forming mode is one-stop spraying film forming, and the film forming thickness is 47 mu m;
d. and (3) baking finish paint: the car body was baked at 175℃for 25min.
(6) And (5) drying and solidifying the powder varnish, and then entering a finishing process.
The coating structures of examples 1 to 3 and comparative examples 1 to 4 were subjected to performance test, and the results are shown in Table 1
TABLE 1 coating structural Properties of examples 1-3, comparative examples 1-4 and VOC detection results
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In the table: NG-disqualification
As can be seen from table 1, the low VOC emission automotive body coating structure of the present invention includes the powder primer coating 2, the intermediate coating 3 and the powder varnish coating 4 in this order from inside to outside, and can reduce VOC emission while ensuring no influence on the appearance performance of the automobile, compared with the prior art. In addition, the invention adopts the powder primer coating with the thickness of 60-80 mu m to replace the electrophoretic coating and the intermediate coating, so that the corrosion resistance of the automobile body can be improved while the appearance performance of the automobile body is ensured, and meanwhile, the stone-strike resistance of the automobile body can be improved while the appearance performance of the automobile body is ensured by adjusting the thickness of the paint film of each layer.
It should be noted that in the present invention, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The invention is not limited to the embodiments described above, but a number of modifications and adaptations can be made by a person skilled in the art without departing from the principle of the invention, which modifications and adaptations are also considered to be within the scope of the invention. What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (10)
1. A low VOC emission automotive body coating structure comprising, in order from the inside to the outside, a powder primer coating, a middle coating, and a powder clear coat coating.
2. The low VOC emission automotive body coating structure of claim 1, wherein the intermediate coating is spray coated with one of a water-based pearlescent paint, a water-based metallic paint, and a water-based color paint.
3. The low VOC emission automotive body coating structure of claim 1, wherein the powder primer coating has a film thickness of 60 to 80 μm.
4. The low VOC emission automotive body coating structure of claim 1, wherein the powder varnish coating has a film thickness of 60 to 80 μm.
5. The low VOC emission automotive body coating structure of claim 1, wherein the intermediate coating has a film thickness of 10 to 20 μm.
6. A method of preparing a low VOC emission automotive body coating structure according to any one of claims 1 to 5 comprising the steps of:
pre-treating the vehicle body; spraying, drying and polishing the powder primer coating; spraying and pre-baking the intermediate coating; and (5) spraying and drying the powder varnish coating, and finishing off-line.
7. The method for preparing a coating structure of an automotive body according to claim 6, wherein the powder primer coating spraying, drying and polishing process comprises the following steps: conveying the automobile body to be coated into a powder spraying room, and carrying out powder spraying to ensure that the thickness of a primer coating is 60-80 mu m; and then baking, and entering a primer polishing procedure after the powder primer is dried and solidified.
8. The method for preparing a coating structure of an automotive body according to claim 6, wherein the powder varnish coating spraying and drying process comprises the following steps: the automobile body to be subjected to varnish coating is conveyed into a powder spray booth, subjected to powder spraying so that the thickness of the powder varnish coating is 60-80 mu m, and then baked.
9. The method of preparing an automotive body coating structure of claim 6, wherein the intermediate coating spray-coating, pre-bake comprises the steps of: and (3) spraying a coating on the surface of the automobile body, wherein the coating is one of water-based pearlescent paint, water-based metallic paint and water-based colored paint, the thickness of the intermediate coating is controlled to be 10-20 mu m, and the intermediate coating enters pre-baking after being sprayed.
10. The method for producing a coating structure for an automotive body according to claim 6, wherein the pretreatment of the automotive body is selected from one of a phosphating pretreatment, a silane pretreatment and a zirconium salt pretreatment.
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