Polyurethanes are mainly needles for some metal materials such as aluminum plates and rock cotton, refrigerated car insulation plates and handmade finishing plates. But usually these materials are directly affected by the quality of our use.

Some common metal surfaces are easily attached to oil and dust due to their own characteristics. In this case, there is a problem of adhesive instability or poor effect. For polyurethane glue, if there is a certain amount of moisture on the metal surface, it is easy to cause a large amount of bubble production, which hinders the bonding contact between polyurethane glue and the material surface, so in this case, it is generally necessary to dry and clean. The use of organic solvents is a good method, for embroidered metal to be polished by sandpaper for rust removal operations.

Many metal surfaces also have some special smoothness, which is generally roughened. It is mainly used to increase the contact area of polyurethane glue and material, which can make the glue stick together like a nail. Our common methods mainly include sandblasting, grinding, and so on. However, some very rough surfaces also have residual osmosis problems. In this case, it is still better to use the bottom solution.

In addition, the curing problem of polyurethane glue is specifically mentioned. The so-called curing is for the situation where the performance efficiency of glue is difficult to dry under certain circumstances. Generally, after the initial consolidation, the glue will produce crystals to increase the strength of the adhesive. Of course, there will be some special situations, such as the time when the catalytic time can be heated, which is often referred to as the hot pressure process. Common hot press processing methods include oven heating, fixture heating, and oven, etc., distinguishing different metal substrates for use.