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Energy-saving coating process

A coating process, energy-saving technology, applied in the device, coating, electrolytic coating and other directions of coating liquid on the surface, can solve the problem of no application, reduce investment and floor space, save heating energy consumption, simplify The effect of the coating process

Active Publication Date: 2009-11-11
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the three-coat coating system that requires primer, intermediate coat, and top coat for the body, due to the existence of PVC weld seam sealing process, there must be at least three drying rooms and three forced cooling rooms on the coating line. However, the "wet-on-wet" coating process of PVC sealant, intermediate coat and top coat requires only two drying chambers and two forced cooling chambers on the painting line, which has no application at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Firstly, surface treatment of the workpiece before painting → cathodic electrophoresis primer → primer drying temperature of the workpiece at 160℃, heat preservation for 20 minutes and cooling → primer polishing and cleaning → PVC car bottom spraying, welding seam sealing and drying for 20 minutes, PVC sealing The glue should be a wet glue suitable for "wet-on-wet" coating with the paint. After the glue is applied, the ambient temperature without gel drying should be controlled at 23±2℃, relative humidity 55±5%, and the maximum relative humidity cannot More than 70%, → spraying and drying of the intermediate coating for 7 minutes, the interval between entering the intermediate coating process should be controlled within one work shift, and should not exceed 12 hours at most, → spraying of topcoat or metal-based paint and drying for 10 minutes → cover The varnish is sprayed and dried for 7 minutes → the film is dried and the temperature of the workpiece is 140 ℃, and the tem...

Embodiment 2

[0028] First, perform surface treatment of the workpiece before painting → cathodic electrophoresis primer → primer drying, the temperature of the workpiece is 180℃, heat preservation and cooling for 20 minutes → primer polishing and cleaning → PVC car bottom spraying, welding seam sealing and drying for about 20 minutes →Intermediate coating spraying and drying time is 15min→top paint spraying or metal base paint spraying and drying for about 10min→overcoat paint spraying and drying for 15min→coating drying, workpiece temperature is 150℃, heat preservation 20min and cooling. In order to make the car body have good sealing, rust resistance, vibration absorption, durability and decoration, it is necessary to seal the body welds; the commonly used PVC weld sealant is mainly composed of polyvinyl chloride resin including polyvinyl chloride monomer , Vinyl chloride, vinyl acetate copolymer, plasticizers including dibutyl phthalate, dioctyl phthalate, fillers including calcium carbonat...

Embodiment 3

[0030] First, perform surface treatment of the workpiece before painting → cathodic electrophoresis primer → primer drying, the temperature of the workpiece is 170 ℃, heat preservation for 20 minutes and cooling → primer polishing and cleaning → PVC car bottom spraying, welding seam sealing and drying for about 20 minutes →Intermediate coating spraying and drying time is 10min→top paint spraying or metal base paint spraying and drying for about 10min→overcoat spraying and drying for 10min→coating drying, workpiece temperature is 145℃, heat preservation 20min and cooling. The coating system of two-coat high-temperature coating suitable for automobile body primer and topcoat can save about 8% of the heating energy consumption of the coating line. The coating of the three-coating system of the automobile body eliminates the traditional PVC drying and intermediate coating drying to simplify the coating process, reduce equipment investment by about 15%, save energy by about 20%, and re...

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Abstract

The invention relates to an energy-saving coating process which is characterized by comprising the following steps: carrying out surface treatment before painting; coating cathodic electrophoretic priming; drying priming paint, keeping the workpiece temperature to be 160 DEG C to 180 DEG C for 20 min and cooling;, sanding the priming and scouring; spraying PVC car bottom and sealing welding line;airing for 20 min; floating coat spray coating; airing for 7 to 15 min; coating finishing coat spray or spraying metal base paint; airing for 10 min; spraying finishing varnish; airing for7 to 15 min;and drying coated film; keeping workpiece temperature to be 140 DEG C to 150 DEG C for 20 min and cooling. PVC glue and a plurality of layers of coating adopt the energy-saving process technology with wet-on-wet coating, so that drying devices on the coating line are saved. Compared with a traditional three-coating coating system, the invention simplifies the coating process, reduces coating device investment and occupation area, saves heating energy of the coating line, reduces the product coating cost, and enhances the market competitiveness of car products.

Description

Technical field: [0001] The invention relates to an energy-saving coating process, in particular to a multi-layer "wet-on-wet" energy-saving coating process. Background technique: [0002] Environmental protection and energy saving are the development trends of automobile production. At present, some automobile companies at home and abroad have adopted advanced energy-saving coating processes of PVC sealant and intermediate coating "wet-on-wet" coating and intermediate coating and topcoat "wet-on-wet" coating, thus eliminating the PVC drying room and The equipment investment and operating cost of the strong cold room or the intermediate coating drying room and the strong cold room. However, for a three-coat painting system that requires primer, middle coat, and top coat for the car body, due to the existence of the PVC weld sealing process, there must be at least three drying rooms and three forced cooling rooms on the painting line. However, the "wet-on-wet" coating process of P...

Claims

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Application Information

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IPC IPC(8): B05D1/38B05D3/00C25D13/00
Inventor 王路路于红吴涛高成勇佟富娟王建兵
Owner CHINA FIRST AUTOMOBILE
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