What details should be noted when applying a primer?
Jan 10,2023
1. What is a primer?
Generally speaking, a primer is also called a base coating agent or a bonding agent for base coatings. It typically has a certain film thickness (although some primers do not have any film thickness), and can be applied to the surface of the substrate through spraying or brushing. It can wet the substrate and help improve the adhesion between the substrate and the paint or strong adhesive, enhancing durability. Common primers include polyester primer, PP primer, metal material primer, etc.
2. What are the functions of a primer?
The effectiveness of a primer varies according to the surface treatment process. In adhesive processes, it usually enhances the bonding strength between the adhesive and the substrate, addressing issues such as delamination on difficult-to-bond substrates. It has excellent lubricity and adhesion levels, promoting the combination of the two through the primer connection safety channel. In painting technology, it improves the surface of the substrate and enhances the adhesion of the solid layer, promoting the adhesion of the paint to the substrate to achieve a strong coating.
3. What substrates is a primer suitable for?
The materials most commonly used in industrial production are plastics and metals, so it is logical to achieve coating through surface treatment on these two types of substrates. The most commonly used substrates for primers in plastics are polyester, PP, etc. Of course, there are other plastic materials, which will not be listed one by one. In addition to plastics, there is also adhesion between metal substrates.
4. What is the method of using a primer?
The method of using a primer is actually very simple and easy to operate. After spraying a layer of primer on the surface of the substrate, you can then spray or brush the paint and adhesive. The specific amount should be determined according to the specific application situation. Generally, spraying 3-μm is sufficient, and you can proceed to the next processing step after it dries. Some primers can also be wet-sprayed.
5. What details should be noted when using a primer?
1. Since primers are developed based on the characteristics of the substrate, it is necessary to clarify the characteristics of the substrate before use. The differences in molecular formulas require different primers for different types of substrates.
2. Before spraying or brushing the primer, the surface of the substrate should be cleaned, as residues from some release agents or cleaning liquids can prevent the primer from functioning effectively.
3. During use, if conditions allow, baking the primer can enhance molecular activity and improve adhesion properties (it is generally recommended to bake at 60-70°C for 3-5 minutes).
4. After opening, the primer should be sealed and attention should be paid to its shelf life.
By understanding the principles of primer effectiveness, suitable substrates, methods of operation, and precautions, it can be seen that its application fields and available processing techniques in the industry are very extensive. Moreover, for different types of primer cases, primers will provide precise solutions tailored to different material structures, offering a comprehensive feasible plan for issues such as discoloration and delamination in the coating industry.
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