原因一

Reason 1

彩钢瓦翻新金属表面处理不充分，过分光滑。喷涂前，底材未经表面处理或处理不彻底，表面残存水分、油污、氧化皮等。漆膜的附着力通常来源于两个方面，一方面是物理上的吸引力和微小的结构域结构之间的勾、搭、缠、绕等结合力;另一方面源于各种化学键产生的结合力。如果底材过于光滑，则涂膜对底材的物理结合力就会变弱，导致漆膜不能附着在底材上从而导致彩钢瓦翻新漆漆膜脱落。

The renovated metal surface treatment of color steel tiles is insufficient and excessively smooth. Before spraying, the substrate has not undergone surface treatment or is not thoroughly treated, resulting in residual moisture, oil stains, oxide skin, etc. on the surface. The adhesion of paint films usually comes from two aspects: on the one hand, the physical attraction and the binding force between small structural domains such as hooking, overlapping, wrapping, and wrapping; On the other hand, it originates from the binding forces generated by various chemical bonds. If the substrate is too smooth, the physical bonding force between the coating and the substrate will weaken, resulting in the paint film not being able to adhere to the substrate and causing the paint film to peel off during the renovation of the color steel tile.

防治方法:把光滑表面打磨成平光,对水分、油污、氧化皮等要彻底干净。

Prevention and control method: Polish the smooth surface to a smooth surface, and thoroughly remove moisture, oil stains, oxide skin, etc.

原因二

Reason 2

彩钢瓦翻新底漆选择不对，造成漆膜脱落。比如漆膜过硬，使面漆不易粘合或底漆光泽太大等原因。底、面漆不配套,造成层间附着力欠佳,兼容性差。

The incorrect selection of primer for the renovation of color steel tiles has caused the paint film to peel off. For example, the paint film is too hard, making it difficult for the topcoat to adhere or the primer has too much gloss. The mismatch between the primer and topcoat results in poor interlayer adhesion and poor compatibility.

防治方法:选用与底漆配套的中间漆或者面漆产品，高性能的彩钢瓦翻新专用漆是做好工程的前提条件。

Prevention and control method: Choose intermediate paint or topcoat products that match the primer, and high-performance color steel tile renovation special paint is a prerequisite for doing a good job in the project.

原因三

Reason Three

彩钢瓦翻新专用漆不能喷涂过厚或漆膜层间干得不透，遇到水气等,漆膜干燥状况不良。如果面漆漆膜厚度超厚或因其他原因底漆中的溶剂不能充分发挥出来,层间的漆膜界面会因为溶剂的存在形成蜂窝状，使得涂膜疏松、强度下降,造成附着力下降，一旦破损就会造成脱落。

The special paint for renovating color steel tiles should not be sprayed too thick or the paint film layers should not be completely dry. When encountering moisture, the paint film may be in poor dry condition. If the thickness of the topcoat paint film is too thick or due to other reasons, the solvent in the primer cannot be fully utilized, the interface of the interlayer paint film will form a honeycomb shape due to the presence of solvent, causing the coating film to become loose and the strength to decrease, resulting in a decrease in adhesion. Once damaged, it will cause detachment.

防治方法:彩钢瓦翻新漆漆膜需干透后并经打磨，可以涂覆面漆，以增加涂层间附着力。但也要防止底漆过度干燥。底漆过度干燥后，底漆中缺少具有活性的极性基团，使得面漆与底漆之间缺乏来自化学键的结合力，从而会降低层间附着力，导致脱落。为了防止层剥落,还要注意,严禁被涂物暴露时间过长，暴露时间过长，底材或底漆容易被异物如油等污染,表面发生粉化或因长时间暴露生成新的化学物质时，面漆不能与底漆或底材充分接触，也会影响涂层之间的附着力，造成彩钢瓦翻新漆漆膜脱落。

Prevention and control method: The paint film of the refurbished color steel tile needs to be dried thoroughly and polished before applying topcoat to increase the adhesion between coatings. But it is also necessary to prevent excessive drying of the primer. After excessive drying of the primer, there is a lack of active polar groups in the primer, resulting in a lack of binding force from chemical bonds between the topcoat and primer, which can reduce interlayer adhesion and lead to detachment. In order to prevent layer peeling, it is also important to note that prolonged exposure of the coated material is strictly prohibited. If the exposure time is too long, the substrate or primer may be easily contaminated by foreign objects such as oil. When the surface undergoes powdering or new chemicals are generated due to prolonged exposure, the topcoat cannot fully contact the primer or substrate, which can also affect the adhesion between coatings and cause the paint film of the color steel tile renovation paint to peel off.

因为彩钢瓦翻新专用漆本身性能原因产生的剥落情况不多见,大部分都是因为底材处理不干净，或者底漆超过了规定的涂装间隔而没有按照要求进行清洁处理所致，因此装前的清理工作要保证涂膜间有足够的附着力，避免产生脱落弊病是关键。

Due to the performance reasons of the special paint for renovating color steel tiles, peeling is not common. Most of it is caused by unclean substrate treatment, or the primer exceeding the specified coating interval and not being cleaned according to requirements. Therefore, the cleaning work before installation must ensure sufficient adhesion between the coatings to avoid the problem of peeling off.

感谢您的阅读，此文的文章来源：济南彩钢瓦厂更多的内容和问题请点击：http://www.jnjgcg.com我们会继续努力的为您提供服务，感谢您的支

Thank you for reading. The source of this article is Jinan Color Steel Tile Factory. For more information and questions, please click: http://www.jnjgcg.com We will continue to work hard to provide you with services. Thank you for your support