During the construction of epoxy floor paint, there are often expansion joints on the ground. At this time, the expansion joints need to be treated first. Otherwise, the epoxy floor paint will crack, peel and drum after construction. Therefore, in order to ensure the quality of floor paint project and make high-quality floor paint project, it is necessary to do a good job in the treatment of expansion joints and so on. Next, Guanglei floor paint manufacturers will give you a detailed description of the epoxy floor paint before the construction of expansion joint treatment methods. 1、用环氧树脂砂浆类(应是无溶剂产品)刚性物质将伸缩缝进行填充，然后按地坪整体涂装的工艺进行，涂装完毕后开裂发生前，地坪涂层上看不到伸缩缝。这种方式不能保证伸缩缝处或附近的地坪涂层不出现开裂和起壳现象。因这类钢性物质并无弹性，无法抵御混凝土收缩开裂时的应力，开裂就无法避免。
1. Fill expansion joints with epoxy mortar (which should be solvent-free) rigid material, and then proceed according to the whole painting process of the floor. No expansion joints can be seen on the floor coating before cracking occurs after finishing painting. This method can not ensure that cracking and shelling do not occur in the floor coating at or near the expansion joint. Because this kind of steel material has no elasticity, it can not resist the stress of concrete shrinkage cracking, cracking can not be avoided.
If uniform and straight expansion joints are allowed on the ground, 2-5 mm wide expansion joints can be cut by cutting machine at the original expansion joints position after coating, leaving expansion space for concrete, which can avoid uneven cracks on the ground in the future and reduce the phenomenon of crust formation along the cracks of the floor coating. Usually this method is acceptable only when the ground decoration requirements are not high.
2. Use elastic material (such as polyurethane elastomer) to fill and flatten the expansion joint, and then coat and finish. Specific operation methods are as follows: First, check the expansion joints, the expansion joints with a width of more than 5 mm, clean up the debris in the joints, and then fill them with elastic glue and scrape them flat. For expansion joints whose width is less than 5 mm, because the seams are too thin to be filled, it is necessary to use a cutting machine to cut the ladder shape with a certain width and depth (the depth is better than 1 mm), to ensure that the cutting is neat, and then the elastic glue can be perfused.
Elastic glue filling method: According to the product instructions of elastic glue manufacturer or using glass gun, attention should be paid to avoid contamination with glue outside the seam as far as possible. If contamination occurs, it should be cleared immediately. After filling the gap, scrape with spatula and remove excess glue. Elastic glue filling needs a certain depth. The dust and other debris in the gap before filling should be cleaned up. Otherwise, it is easy for elastic glue to adhere to concrete and separate from it.
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