Application of insulation material in solar water heater

Polyurethane rigid foam has become a widely used insulating material due to its excellent thermal resistance and ease of molding. However, as a reaction-molded polymer, it suffers from a common issue: mold shrinkage. This occurs when the foam shrinks after the chemical reaction completes, resulting in a smaller volume than the original cavity. Such shrinkage often leads to problems like separation between the foam and the outer shell, which can affect both the aesthetics and the performance of the product. In many applications, increasing the density of the foam is a common solution to minimize these issues. While this method helps reduce shrinkage, it also increases the cost, especially for complex shapes like thin shells or intricate nozzles. In the case of solar water heaters, high-density foaming is frequently used, but it can lead to problems such as deformation of internal components and even extrusion of the shell during the process. To address these challenges, extensive research has been conducted to find a way to reduce the shrinkage rate without increasing the foam density. By optimizing the formulation and selecting better materials, new combinations have been developed specifically for solar water heaters. These improvements have already shown promising results on certain production lines. The foam now adheres more effectively to the shell, reducing peeling and significantly lowering the risk of inner shell deformation. As a result, the overall safety and quality of the products have improved considerably.

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