Light truck painting process adopting water-based BIB2 matched with solvent type 1K varnish

Abstract

The invention provides a light truck painting process adopting water-based BIB2 matched with solvent type 1K varnish and belongs to the technical field of vehicle paint spraying. The process is characterized by including the steps of wiping clean, blowing with deionized wind, painting B1 outer surface, painting B2 inner surface, painting B2 outer surface, performing hot flash off, conducting forced cooling, painting IK varnish, levelling and drying; the B2 inner plate painting process also serves as the normal-temperature levelling process of B1 outer plate paint film, the levelling time is 600-720s; the hot flash off process is divided into the dewatering part and the high-temperature flash off part, the dewatering temperature is 40-45 DEG C, the dewatering time is 210-240 s, the high-temperature flash off temperature is 80-90 DEG C, and the high-temperature flash off time is 210-240 s; after the hot flash off process is finished, 1K varnish painting is conducted. The process requiresless investment, the work period is short, the place for automobile improvement covers a small area, the production rhythm is fast, and the energy consumption is small.

Description

technical field [0001] The invention discloses a water-based B1B2 and solvent-based 1K varnish spraying process for light truck coating, belonging to the technical field of car paint spraying. Background technique [0002] B1B2 spraying process is a spraying process without intermediate coating, and it is a short process that is more compact than the traditional 3C2B and 3C1B process in the painting spraying process. Water-based paint is a kind of paint that uses water as the main solvent. Compared with solvent-based paint, it can greatly reduce the VOCs content in painting exhaust gas, and realize the green painting of light truck body. [0003] At this stage, the mainstream water-based spraying process in the paint shop of an automobile factory roughly includes the traditional 3C2B (three-coating and two-baking) process, the compact 3C1B (three-coating and one-baking) process, the B1B2 (intermediate coating-free) process, and the 1C1B (Monocoat single-coating) process. to...

AI Technical Summary

Problems solved by technology

From the above process flow, it can be found that the 3C2B process achieves the maximum process reliability at the cost of high cost due to the longer coating production line and more equipment, which is contrary to the current reality of energy consumption reduction and environmental protection; the 3C1B process although The drying and sanding of the intermediate coating are canceled, but pre-baking and strong cooling are added between the intermediate coating and the base paint, and between the base paint and the varnish, resulting in a large equipment investment and energy consumption in this process

The cab spraying of the existing light truck production lines in China is still mostly oil-based paint technology, and most of the light truck production lines using water-based paint technology follow the spraying technology of 3C2B and 3C1B and match 2K (two-component) varnish, and most of them are single products and use one Coating line for spraying process

At present, there are still many problems in the two processes, such as: First, most of the water-based paint spraying processes used in light truck coating lines at this stage are old line renovation projects, which are transformed into 3C2B or 3C1B processes, and old lines need to be transformed and newly added. There are a lot of equipment, and it takes up a lot of space for transformation, which will require a lot of capital investment; second, in the production process, because the above process uses 2K varnish, and the two-component varnish uses isocyanate with a higher price as a curing agent, this It also increases the cost for automobile manufacturers; thirdly, due to the above-mentioned technological transformation on the production line, the changes are large and the transformation period is long, so the production line will not be able to produce for a long time

Fourth, the traditional process production line has high labor, energy consumption, and material and auxiliary material consumption, and the overall operating cost is high

Images