What should be paid attention to when choosing a solvent?

The correct choice of solvent is of great significance to improve the quality of the coating film, reduce the cost, and reduce the health hazards to the operators. Therefore, the following points should be paid attention to when choosing the solvent:

(1) When choosing a solvent, the ability of the solvent to dissolve film-forming substances should be considered. When the solvent is added, there should be no turbidity and precipitation, and the paint must be transparent and have a certain viscosity.

(2) The color of the solvent should be light, it is recommended to be colorless and transparent, with as few impurities as possible, otherwise it will affect the color of the paint film after drying.

(3) Among similar solvents, solvents with low toxicity should be selected as much as possible. When it is necessary to use highly toxic solvents, it should be considered whether to use mixed solvents (replacing part of the highly toxic solvents with low-toxic solvents) to reduce toxicity and strengthen labor protection.

(4) The volatilization speed of the solvent should be considered, and the form of the paint film should be adapted. Too fast volatilization will affect the leveling of the paint film; too slow volatilization will cause the paint film to sag and dry slowly.

(5) The primer and topcoat of the same type of paint should use the same solvent.

(6) Try to use solvents with higher flash point, fire point and self-ignition point, and the solvents are less corrosive and have better chemical stability.

(7) It is necessary to choose a solvent that is cheap and applicable, has a wide range of sources, and is easy to supply.