水性工业漆常见问题 【上海斯鼎涂料公司】

Frequently Asked Questions about Waterborne Industrial Paints
Cause 1: The bottom layer is not thoroughly cleaned, for example, the grease or wax on the bottom layer surface is not completely removed. Due to the influence of the interlayer effect, the re-sprayed paint cannot be attached. Reason 2: The interval between secondary spraying is too short, and the primer is not given sufficient drying time, which causes the water in the wet paint surface to erode the primer or topcoat to soften it. Correction: Sand the defective area until it is smooth but not worn through, and repaint.

Sagging Reason 1: Improper use of the spray gun. For example, if the compressed air pressure is too low, or the distance between the spray gun and the spray surface is too close, or the speed of the spray gun is too slow, it will increase the possibility of sagging. 20-25cm, and the moving speed of the spray gun should be uniform. Grasp the limit spray amount that will cause sag, and focus on spraying while observing the film formation. Reason 2: The temperature of the spraying workshop is too low, the sprayed paint layer is not easy to dry or the one-time sprayed paint layer is too thick, resulting in a decrease in the drying speed of the paint layer. Correction method: When the sagging phenomenon is slight, after the surface of the paint film is dry, wet sand the defective area with fine sandpaper.

Yellow rust appears Reason 1: The surface of the coated metal has been severely rusted and the surface is wet. Reason 2: If the surface drying time of the paint is too long, rust spots will appear. Reason 3: The one-time construction coating film is too thick and the surface dries slowly, and rust spots will appear. If the paint is diluted with excessive water and the water volatilizes slowly, rust spots will appear. Correction method: The construction environment temperature is too low or the rainy construction humidity leads to slow drying and flash rust; under various conditions, the paint should not be diluted as much as possible, and the ventilation should be strengthened to keep the air flowing as much as possible to improve the drying speed; Do not apply in rainy days .
水性工业漆常见问题
漆膜隆起 原因一：底层没有进行彻底地清洁，例如底层表面的油脂或蜡质物没有彻底清除，由于夹层效应的影响，导致再喷涂的涂料无法附着。原因二：二次喷涂的间隔时间太短，没有给予底层涂料充分的干燥时间，导致湿漆面中的水侵蚀中涂底漆或面漆使之变软。修正方法：打磨有缺陷的区域至平滑但不能磨穿，重新进行喷漆。

流挂 原因一：使用不当。例如压缩空气压力过低，或喷枪与喷涂表面距离过近，或喷枪移动的速度过慢，均会增加流挂现象出现的可能性，应适当调整喷幅形状和喷涂气压，使喷射距离保持在20-25cm，而且的移动速度应均匀。把握产生流挂的极限喷涂量，集中注意力边观察漆膜形成的情况边喷涂。原因二：喷涂车间温度过低，喷涂的漆层不易干燥或一次性喷涂的漆层太厚，导致漆层干燥速度降低。修正方法:流挂现象轻微时，待漆膜表面干燥后先用细砂纸湿打磨有缺陷的区域，流挂现象严重时，打磨有缺陷的区域后重新进行喷漆。

出现黄色锈 原因一：被涂金属表面已经严重锈蚀且表面潮湿。原因二：涂料表干时间过长也会出现锈点。原因三：一次性施工涂膜过厚表干慢也会出锈点，涂料过量加水稀释水份挥发慢也会出现锈点。修正方法：施工环境温度太低或者阴雨施工湿度大导致干燥慢也会导致闪锈；各种条件下施工时涂料尽量不要稀释，并加强通风保持空气流动尽可能的提高干燥速度；不要在雨天施工。www.sisdin88.com