לציפויים יש תפקיד חשוב ביישומים תעשייתיים, אלא במהלך תהליך הבנייה, a rough wet paint film is usually formed, which needs to go through the leveling process to achieve good surface quality. The flatness of the paint film is crucial to the painting process, because it directly affects the final quality and appearance of the painting.

Poor film levelling can lead to a variety of problems, such as brush marks when brushed, orange peel-like surface textures when sprayed, and roll marks when rolled. באופן מיוחד, it should be emphasized that the orange peel effect in the spraying process is very important for industrial applications. The orange peel effect is caused by tiny bumps formed by paint mist particles on the surface of the wet paint film, which sometimes resemble orange peel, hence the name orange peel.

למה פילוס סרטים כל כך חשוב?

Some coatings contain highly volatile solvents, and these coatings are prone to produce orange peel effect during spraying. בדרך כלל, a mixture of fast and slow volatile solvents is used in coatings. In the spray construction, most of the volatile solvents have evaporated, which will improve the viscosity of the paint and reduce the possibility of wet paint film flowing down. The slow volatile solvent gives the wet film enough time to level itself and helps to expel the air in the wet film, thereby reducing the risk of holes bursting during baking.

למרות זאת, it should be noted that the volatility of the solvent will affect the change of the surface tension of the coating, and the surface tension directly affects the leveling property. בכללי, the higher the surface tension, the better the leveling of the wet paint film. This is because liquids with high surface tension flatten more easily. לָכֵן, during the coating process, the volatility of the coating will change, resulting in a change in the surface tension of the coating, which will affect the leveling property of the coating.

Water-diluted coatings are a special case in which a fast evaporating solvent (such as isobutanol) is used mixed with water. The surface tension of water is relatively large, and the surface tension of isobutanol is small, so isobutanol volatilizes faster, so that the proportion of water in the mixed solvent gradually increases, resulting in an increase in surface tension, thereby promoting leveling.

למה פילוס סרטים כל כך חשוב?

In fact, the leveling of paint film is a dynamic process, אשר מושפע מגורמים רבים. בנוסף למתח הפנים, חספוס פני השטח של סרט הצבע הרטוב, הצמיגות של סרט הצבע והעובי של סרט הצבע הרטוב משפיעים גם הם על מהירות הפילוס. יש לציין שצבע שמשתטח מהר מדי נוטה בדרך כלל לבעיות זרימה, מה שאומר שסרט הצבע הרטוב זורם כלפי מטה תחת פעולת כוח המשיכה שלו, וכתוצאה מכך חוסר אחידות על פני השטח.

לסיכום, פילוס סרט הצבע הוא תהליך מורכב וקריטי בתהליך הצביעה. בבחירת הציפויים ותהליך הציפוי, יש צורך לשקול גורמים כגון בחירת ממס, מתח פנים, צמיגות הציפוי, roughness and thickness of wet paint film to ensure that a smooth and uniform coating surface is finally obtained to meet the requirements of industrial applications.