(1) Cost analysis of paint materials
        The average price of solvent based paint is 150-250 yuan / L, and the average price of water-based paint is 300-400 yuan / L, so the price of water-based paint is about 1 times higher than that of solvent based paint, about 150 yuan / L higher.
(2) Solvent cost analysis
        The cost of solvent includes diluent cost and cleaning agent cost.
        The average price of diluent for solvent paint is 20 yuan / L, the average price of cleaning agent is 10 yuan / kg; the average price of diluent for water paint is 1 yuan / L, and the average price of cleaning agent is 1 yuan / kg, so the cost of diluent for water paint is 19 yuan / L lower than that for solvent paint, and the cost of cleaning agent for water paint is 9 yuan / kg lower than that for solvent paint.
According to the proportion of 1l paint, the consumption of diluent and cleaning agent is calculated. The total cost of diluent and cleaning agent for solvent based paint is 80 yuan, and the total cost of diluent and cleaning agent for water-based paint is 14 yuan, so the solvent cost of water-based paint is 66 yuan / L lower than that of solvent based paint.
(3) Analysis on the operation cost of spray booth
        The operation cost of solvent based paint mainly includes the heating of baking room, fan circulation, lighting and other electric fees (150-170 yuan / day), the maintenance of baking room equipment and the replacement of air filter screen; the operation cost of water-based paint mainly includes the electric fees (80-100 yuan / day) for temperature control and humidity control of paint spraying room, heating of baking room, fan circulation, blower, lighting and other electric fees, as well as the replacement of air filter screen and baking room equipment Maintenance of spare parts. Compared with solvent based paint, the operation cost of water-based paint is also reduced. Infrared lamp is mainly used for local heating to avoid the energy waste caused by all air heating in the spray booth.
(4) Environmental protection cost analysis
        According to the exhaust emission requirements of spray paint, the simple activated carbon adsorption process can be used for the coating process of waterborne paint. The environmental protection cost of waterborne paint is about 120 yuan / day based on the treatment air volume of 10000m3 / h. The waste gas concentration of solvent based paint is about 20 times higher than that of water-based paint. The coating process needs to adopt the adsorption combined use technology. According to the air volume of 10000m3 / h, the environmental protection cost of solvent based paint is about 320 yuan / day.
(5) Invisible cost analysis of staff health
        A large number of VOCs, such as benzene, toluene and xylene, are produced in the use of solvent based coatings. The health hidden cost of workers using solvent based coatings is large. The solvent of waterborne paint is water, which is non-toxic and harmless. The health invisible cost of workers using waterborne paint is small.
(6) Summary of cost analysis
        In terms of operation cost + environmental protection cost + staff health invisible cost, waterborne paint has obvious advantages. Therefore, from a long-term point of view, it is feasible to replace solvent paint with waterborne paint.