Лако-красочные материалы — производство

Applications for silicones in bonding are numerous. Generally, one sealant will not bond to all substrates and it is common practice to develop new formulations to meet the ever — increasing list of requirements. In some instances primers are used for certain substrates, but silicones are usually self-priming. This self-priming feature is important from the standpoints of reducing installation costs and in reducing dependency on high-solvent primers, which are sometimes subject to environmental regulations. The surface charac­teristics for a given type of substrate can vary considerably between substrate manufac­turers. For this reason it is always advisable to check adhesion before specifying a particular sealant. In addition, the importance of proper substrate cleaning and prepara­tion should not be overlooked. Most adhesive and sealant producers will recommend the proper procedures for surface preparation. Some of the more common substrates and related applications for silicones are given in Table 3.

Table 3 Applications of Substrates

Substrate Examples Typical applications