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CN-121975388-A - Primer-color combined legend black paint and primer-free 2C1B coating process applied to automobile exterior bumper

CN121975388ACN 121975388 ACN121975388 ACN 121975388ACN-121975388-A

Abstract

The invention relates to a primer-color-combined legend black paint and a primer-free 2C1B coating process applied to an automobile exterior bumper, wherein a primer production section in the original coating process flow is canceled, a color paint air gun is canceled in the color paint production section, a material part enters a flame chamber after passing through a loading area, pretreatment and a water cutting and drying furnace, directly enters a color paint spraying room after flame treatment, is only sprayed by a color paint electrostatic gun, and is closed under high pressure, and the color paint adopted by the color paint electrostatic gun spraying is the primer-combined legend black paint designed for development, and then enters a discharging area after passing through a leveling area, a varnish spraying area, a leveling area and a varnish drying furnace. The technology is converted from original 3C1B to 2C1B, the primer section spraying and the colored paint section air gun spraying are canceled, the coating process steps are effectively shortened, the single-piece coating manufacturing cost is effectively reduced, and the competitiveness of the terminal product is enhanced.

Inventors

  • WANG KANG
  • WEN CHENGYUAN
  • MU DAN
  • WAN CHUYANG
  • WANG YIWEN
  • XU DAN
  • ZHAO YINPING
  • LI YANJUN
  • ZHAO WEIGUO

Assignees

  • 长春富维东阳汽车零部件有限公司

Dates

Publication Date
20260505
Application Date
20260211

Claims (10)

  1. 1. A preparation method of the ground color integrated legend black paint is characterized in that 14 g acrylic acid modified chlorinated polyolefin resin is added into 30g of butyl acetate solvent to be dissolved, 1 g dispersing agent is added, after 30min is dispersed at high speed under 2000 r/min, 2g high-blackness conductive pigment and 9.5 g surface modified barium sulfate are added to be ground, the ground particle size is 1-13 mu m, a grinding machine is cleaned by 34.55g of xylene solvent, 1.5g chlorinated polyolefin resin, 3.5g of polyester resin, 1.1 g CAB, 0.6 g light stabilizer and 2g of 80 ℃ unsealed closed isocyanate cross-linking agent are continuously added, and finally 0.25 g pearl is added to be mixed, and the ground color free paint is obtained.
  2. 2. The primer-in-one legend black paint according to claim 1, wherein the Gao Heidu conductive pigment system is composed of conductive carbon black as a main body, provides blackness and conductivity, and is supplemented with 0.01% -0.3% of beta-phthalocyanine blue pigment to correct blue phase and eliminate red/yellow phase.
  3. 3. The primer-in-one legend black paint according to claim 1, wherein the dispersant is a polyurethane type polymeric dispersant.
  4. 4. The base color-in-one legend black paint according to claim 1, wherein the surface modified barium sulfate is silane coupling agent modified barium sulfate.
  5. 5. The base color-in-one legend black paint according to claim 1, wherein the light stabilizer is Tinuvin 123 hindered amine light stabilizer.
  6. 6. The process is characterized in that a primer production section in the original coating process flow is canceled, a colored paint air gun spraying is canceled in the colored paint production section, a material part enters a flame chamber after passing through a part feeding section, pretreatment and a water cutting drying furnace, directly enters a colored paint spraying room after flame treatment, only the colored paint electrostatic gun spraying is carried out, the high pressure of the electrostatic gun is closed, the colored paint adopted by the colored paint electrostatic gun spraying is the ground color-in-one legend black paint according to any one of claims 1 to 5, and then enters a part discharging section after passing through a leveling section, a varnish spraying section, a leveling section and a varnish drying furnace.
  7. 7. The primer-free 2C1B coating process for the automobile exterior bumper is characterized in that the primer-to-primer black paint spraying construction parameters are that the paint quantity of a colored paint electrostatic gun ranges from 100 to 400 ml, the forming air of the colored paint electrostatic gun ranges from 1:200 to 400 NL, the forming air ranges from 2:300 to 500 NL, the gun speed of the colored paint electrostatic gun ranges from 600 mm/s, the rotating speed of a colored paint electrostatic rotary cup ranges from 3 ten thousand to 4 ten thousand r/min, and the parameters after drying are that the dry film thickness of the colored paint ranges from 8 to 12 mu m and the dry film resistance ranges from 400 to 700K omega.
  8. 8. The primer-free 2C1B coating process for the automotive exterior bumper according to claim 6 or 7, wherein a high-boiling-point slow-drying agent is added into a paint system before the paint is sprayed, wherein the high-boiling-point slow-drying agent comprises 70% of S-100, 10% of ethylene glycol monobutyl ether and 20% of S-150, and the addition amount is 40% -80% of the base color-in-one legend black paint.
  9. 9. The primer-free 2C1B coating process for automotive exterior bumpers according to claim 6 or 7, wherein the paint film thickness, coating uniformity and wetting state at the pitting position are increased for the position where the pitting easily occurs when the paint is sprayed.
  10. 10. The primer-free 2C1B coating process for automotive exterior bumpers according to claim 6 or 7, wherein the thickness of the varnish is 20 μm or more.

Description

Primer-color combined legend black paint and primer-free 2C1B coating process applied to automobile exterior bumper Technical Field The invention belongs to the technical field of automobile manufacturing, relates to automobile exterior bumper coating, and in particular relates to a primer-color-in-one legend black paint and a primer-free 2C1B coating process applied to an automobile exterior bumper. Background The traditional automobile exterior bumper coating process flow comprises primer coating, colored paint coating, varnish coating and drying, namely a 3C1B coating process is adopted, wherein the purpose of the primer coating is to enhance the adhesive force between paint (colored paint) and bumper materials (PP), improve the paint application rate of the paint and provide covering power, but the adverse effects of increased coating cost, increased energy consumption and the like are brought at the same time. Specifically, the primer coating cost is 20% -30% of the total paint cost. Besides paint material costs, there are also several operating costs involved in the primer coating area, such as primer coating robot equipment investment, robot power consumption, robot spare parts, compressed air preparation costs, dry venturi circulation fan power consumption, paper box, filter cotton auxiliary material consumption, wet venturi circulation fan, water curtain circulation pump, slag removal pump power consumption, filter cotton, waste residue, waste water, waste paper box hazardous waste disposal costs, etc. In summary, the use of primer coating can occupy relatively large operating and maintenance costs, increasing the cost of manufacturing the product in one piece. Disclosure of Invention The first object of the invention is to provide a primer-to-primer black paint which provides conventional primer and paint functions, ensures the adhesion, water resistance and filling property of the coating, and also ensures the requirements of color difference, weather resistance and leveling property. In order to achieve the above purpose, the invention adopts the following technical scheme: A preparation method of the primer-to-primer black paint comprises the steps of adding 14 g acrylic acid modified chlorinated polyolefin resin into 30g of butyl acetate solvent for dissolution, adding 1 g dispersing agent, dispersing at a high speed at 2000 r/min for 30 min, adding 2 g high-blackness conductive pigment and 9.5 g surface modified barium sulfate for grinding, wherein the ground particle size is 1-13 mu m, using 34.55g of xylene solvent for cleaning a grinder, continuously adding 1.5 g chlorinated polyolefin resin, 3.5g of polyester resin, 1.1 g CAB, 0.6 g light stabilizer and 2 g of 80 ℃ unsealed closed isocyanate cross-linking agent, dispersing uniformly, and finally adding 0.25 g pearls for color mixing, and dispersing uniformly to obtain the primer-free black paint, namely the primer-to-primer black paint. As the preferable choice of the invention, the Gao Heidu conductive pigment system takes conductive carbon black as a main body, provides blackness and conductivity, and is supplemented with 0.01% -0.3% of beta-phthalocyanine blue pigment to correct blue phase and eliminate red/yellow phase. Preferably, the dispersant is a polyurethane type polymer dispersant. Preferably, the surface-modified barium sulfate is a silane coupling agent-modified barium sulfate. The light stabilizer is Tinuvin 123 hindered amine light stabilizer. The second aim of the invention is to provide a primer-free 2C1B coating process applied to an automotive exterior bumper, which is characterized in that a primer production section in the original coating process flow is canceled, a colored paint air gun is canceled in a colored paint production section, a material part enters a flame chamber after passing through a workpiece loading area, pretreatment and a water cutting and drying furnace, directly enters a colored paint spraying room after flame treatment, is subjected to colored paint electrostatic gun spraying, is closed under high pressure, and the colored paint adopted by the colored paint electrostatic gun spraying is the base color-in-one legend black paint, and then enters a workpiece unloading area after passing through a leveling area, a varnish spraying area and a varnish drying furnace. As the preferable application of the invention, the spraying construction parameters of the base color-in-one legend black paint are that the paint quantity of the color paint electrostatic gun ranges from 100 to 400 ml, the forming air of the color paint electrostatic gun ranges from 1:200 to 400 NL, the forming air ranges from 2:300 to 500 NL, the gun speed of the color paint electrostatic gun ranges from 600 mm/s, the rotating speed of the color paint electrostatic rotating cup ranges from 3 ten thousand to 4 ten thousand r/min, and the parameters after drying are that the dry film thickness of the color paint ranges from 8 to 12 mu m