Paint anti-mildew agent to effectively anti-mildew
1, evenly dispersed in the paint.
2, to ensure that the amount added is higher than the minimum inhibitory concentration (MIC) of the mildew inhibitor. For example, Nordes EPW paint film anti-mildew agent in the preparation of interior anti-mildew coating formula to add 0.3%, in the preparation of exterior anti-mildew coating formula to add about 0.5% anti-mildew agent, in high temperature and high humidity environment and other circumstances should also be increased.
The drying speed of air-drying coatings is the main indicator for evaluating the drying performance of driers. The drying process can be roughly divided into the following stages: ①The leveling stage, the paint has fluidity, as the solvent gradually volatilizes, the fluidity of the paint gradually weakens, and it enters the drying stage; ②At the beginning of the drying stage, the paint loses its flow Cohesion is strengthened, and the coating gradually transitions from a loose structure to a dense structure; ③In the surface drying stage, because the skin of the paint film contacts the air, the solvent volatilizes the fastest, and the binder has the strongest effect of oxidative polymerization, so the surface is dry The fastest, dense and tough paint film is formed from the surface to the inside, and gradually deepens to the bottom of the paint film, and enters the complete drying stage to form a paint film with protective and decorative effects.
There are certain differences among countries in the division of the various stages of coating drying. The American Society for Testing and Materials (ASTM) divides the drying stage into 8 stages: set fortouch, dust free, ptfe dispersion emulsion tack free, dry totouch, and hard dry. dry hard), dry through, dry to han-dle, dry to recoat, print free.
The International Association for Standardization (ISO) “Determination of Dryness of Paint Films” divides the drying process into three stages-surface drying, non-stick drying and hard drying. my country’s national standard (GB) simplifies the drying degree of coatings into two stages: surface drying and actual drying. Surface drying time refers to the time required for a certain thickness of paint film to form a thin paint film on the surface with a fluid layer under specified drying conditions. The actual drying time refers to the time required to form a solid paint film under the same conditions.
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