Coating process capable of lowering VOCs

Abstract

The invention discloses a coating process capable of lowering VOCs. The 3C2B coating process is adopted. On a traditional solvent-type coating line, high-solid content paint with low VOCs are used in colored paint and varnish, there is no need to transform a large number of coating lines, and the high-solid content paint requirement can be met only by slight change of a colored paint and varnish feeding system, spraying equipment and spray booth air-conditioning equipment of an original production line. Emission of the VOCs is reduced under the condition of low cost, and the environmental requirement can be met. Furthermore, the quality of coatings is stable and easy to control, difficulty in operation is low, running energy consumption and material cost are low, aftertreatment is simple, change is small, changing investment is low, and generalization performance is high.

Description

technical field [0001] The invention belongs to the field of automobile coating technology, and in particular relates to a coating technology for reducing VOCs. Background technique [0002] With the rapid development of industry, the pollution produced by industrial waste gas has become more and more serious, which has caused serious harm to human living environment and body. VOCs are an important part of industrial waste gas and the most difficult part to treat. After VOCs enter the human body through the skin and respiratory tract, they can cause lesions and even cancer to the respiratory, blood, liver and other systems and organs. [0003] With a series of environmental and health problems caused by VOCs emissions, the country's control of VOCs emissions is becoming more and more stringent. In 2010, for the first time, VOCs were listed as key pollution sources in the "Guiding Opinions on Promoting Joint Prevention and Control of Air Pollution to Improve Regional Air Qua...

AI Technical Summary

Problems solved by technology

[0015] At present, when the old production line of automobile painting is being transformed, the transformation of "water-based paint coating process" or "high solid 3C1B compact coating process" has the following problems: ① Large amount of transformation, high investment, and poor feasibility: water-based paint The process transformation needs to increase the intermediate coating pre-drying and color paint pre-drying processes, and the original equipment can not be used basically, and most of the equipment needs to be replaced, and the transformation investment needs hundreds of millions; the compact process transformation needs to cancel the intermediate coating drying , grinding, the short-circuit route from intermediate coating spraying to color paint spraying is difficult to smooth, the amount of changes is large, the investment is high, and even some production lines cannot go through due to site restrictions; complex transformations lead to long production stoppages; serious losses to enterprises Huge waste, outweigh the gain

②Quality and management risks: Changing the existing production line to a compact process has extremely high requirements for electrophoretic coating quality, environmental cleanliness, and on-site management. Old production lines are generally difficult to meet, and there are quality risks

[0016] Therefore, when the traditional solvent-based coating line carries out the environmental protection transformation of the solid coating spraying process, there are problems such as heavy transformation workload, large investment, and difficult to smooth layout.

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