The application of primer is usually in the spray painting and gluing process on the surface of plastic or metal substrates. It is mainly used to solve the phenomenon of spray paint peeling and adhesive degumming, and has the effect of improving adhesion. 1. The function principle of primer: If the function of Shizukawa primer is distinguished according to the surface treatment process, in the adhesive process it is mainly to improve the bonding strength between the adhesive and the substrate and solve the problem of degumming of difficult-to-adhesion substrates. It has good wettability and adhesion ability, and promotes the combination of the two through the link channel of the primer. Moreover, in the spray painting process, the surface of the substrate is improved and the adhesion between layers is enhanced to promote the adhesion between the paint and the substrate to achieve a strong coating.
? 2. Substrates suitable for primers: The most commonly used materials in industrial production are plastics and metals, so it is natural that these two types of substrates are used for coating through surface treatment. The base materials that Shizukawa primer is commonly used in plastics are nylon, PP, etc. Of course, there are other plastic materials, so I won’t list them one by one. In addition to plastics, there are also bonding between metal substrates. 3. How to use primer: The method of using primer is actually very simple and easy to operate. Just spray a layer of primer on the surface of the substrate and then spray or apply paint and adhesive. The specific amount needs to be determined according to the actual usage. Generally, for spray painting, it is enough to spray 3-μm, and then wait for it to dry before proceeding to the next step. Part of the primer can also be sprayed wet.
4. Precautions for using primer: 1. Because primer is a surface treatment technology developed based on the properties of the substrate, it is necessary to determine the properties of the substrate and the difference in molecular structure before use. Different substrates require different primers. 2. Before spraying or painting the primer, the surface of the substrate needs to be cleaned, so the residue of some release agents or cleaners will prevent the primer from functioning properly. 3. If the primer is baked under conditions during use, the increase in temperature can increase molecular activity and have a beneficial effect on adhesion (it is generally recommended to bake at 60-70°C for 3-5 minutes) 4. Primer After opening, the paint needs to be sealed and the shelf life must be paid attention to