![]() ![]() This is represented by the fact that every building shown in the picture of the Via San Lorenzo in Geneva where the G7 meetings were held are coated with SREP products (see Figure 5). ![]() In fact, SREP products from a range of coatings manufacturers make up about 20% of the German exterior architectural coatings market and about 10% of the Western European exterior architectural coatings market. Since SREP technology and products were originally developed in Europe, it is not surprising that most applications are found there. In this case, it is SREP's ability to withstand extreme UV exposure in high humidity environments with excellent water repellency and vapor permeability over building structures. Capitol Building, Courtesy of PROSOCO Market Acceptance The definitive capability for any coating is its performance under the conditions for which it is intended. Figure 4 shows vapor permeability test results demonstrating the relatively high vapor permeability of SREP resulting from its porous nature.įigure 7 / U.S. Consumers find that they are able to save money over time by not having to re-paint as often. ![]() ![]() As a result, coatings manufacturers find that they can sell the value resulting in good profit margins and quality reputations with green products. This relatively high vapor permeability makes the products resistant to blistering and peeling, allowing coatings to last as long as 25-30 years. Figure 3 shows water repellency results of four examples of SREP having over 8 years of exterior exposure.Ī defining characteristic of SREP products is their unique combination of water repellency with high vapor permeability (typically at least 20 perms). This benefit is also obtained with high-quality conventional latex offerings. The main cost of re-coating/repair is in the labor and, therefore, protection from water damage provides the consumer with an economical coating. End users also benefit by saving money that might be spent on repairs. This leads to the ability to produce high-performance offerings and to receive the value of those offerings. Figure 1 is a pictorial diagram of representing this concept and Figure 2 is a magnification of typical latex and a SREP system.įor example, the water-repellent feature of SREP provides substrate protection against water damage. Therefore, if cracks develop in the coating, the hydrophilic pigments and substrate are protected from water intrusion by the hydrophobic layer of silicone. The silicone resin emulsion will have a tendency to encapsulate the inorganic particles, which are in solution forming a hydrophobic shell. The organic substituents on the silicone are facing the less polar medium, such as the organic resin, which make the TiO2 appear to be hydrophobic. Therefore, when the siloxane comes into contact with inorganic (polar) substances, the tendency is for the silicone to orient itself so that the Si-O is bonded to the inorganic species such as TiO2. The former enables silicone to rearrange when in solution or during curing to align itself and eliminate any surface tension gradients that exists in the liquid-to-air or the liquid-to-solid interface. These are the low rotational energy requirement of a dimethylsiloxane and the high-energy bond strength of the siloxane backbone. There are essentially two characteristics that make silicone unique. Figure 3 / Water Repellency of SREPs on Exterior Exposure Silicone resin emulsions are based on silane/siloxane technology with additional high-molecular-weight siloxane networks (resin). ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |