As one of the components of the paint, the solvent plays an indispensable role in the paint, especially the volatilization-drying paint. First of all, for most coatings, as a liquid film-forming material that can be applied in a certain way, a solvent needs to be used as a dispersion medium to make the film-forming material present the required liquid viscous state. While exhibiting the dispersion effect, the solvent can affect the storage, construction, and gloss, adhesion, and surface state of the paint film by providing the ability to dissolve the film-forming substance and the appropriate volatilization speed. Second, the solvent is required to have independent stability that does not interact with other components in the coating. In addition, the use of solvents should meet the requirements of less toxicity, safety, less irritation or no irritating odor as far as possible, and has the advantages of abundant sources and low prices.
In addition, the choice of solvent for paint will have an important impact on the appearance of the paint and the quality of the paint. Therefore, when choosing a solvent for paint, it should be carefully considered. The general selection process is as follows: first, consider the solubility of the resin and its interaction. The miscible solvent between them, secondly consider the volatilization speed of the solvent or mixed solvent. Again, consider other factors.
When considering the solubility of paint resins and their miscibility with each other, you can choose according to the following three rules: 1. The principle of similar polarity 2. The principle of solvation 3. The principle of similar concentration parameters.
For mixed solvents, in addition to selecting solvents according to the above requirements, thinners should also be selected from aspects such as price, toxicity, and odor. The amount of thinners that can be mixed with solvents is usually determined in this way. In the range of 50-80% of the parameter.
After determining the various types of paint solvents, the various simultaneous equations that reflect the restrictions on the selection of paint mixed solvents are used to solve the problem by calculation through linear regression analysis, and other characteristics of paint solvents are considered comprehensively, namely Economical and good performance solvent blends for paints are available.
