Polyurethane Heat Storage Material With Solid-Solid Phase Transition

The patent utilizes solid-solid phase transition of the polyurethane itself as the heat storage mechanism. The polyurethane undergoes a reversible phase transition between different solid states, absorbing and releasing heat while maintaining its shape. This eliminates the need for encapsulated phase change materials that cause shape changes, as the polyurethane matrix itself performs both structural support and heat storage functions.

The patent creates a composite polyurethane system by incorporating specific additives (such as metal salts, oxides, or other compounds) into the polyurethane matrix. These additives modify the polyurethane's thermal properties to enhance heat storage capacity and heat resistance while maintaining shape stability. The composite structure allows the material to retain its elastic and mechanical properties while achieving superior heat storage performance.

The patent extracts the heat storage function from separate encapsulated materials and integrates it directly into the polyurethane molecular structure through chemical modification. By incorporating phase transition-capable groups into the polyurethane chains themselves, the heat storage functionality becomes an intrinsic property of the polymer matrix, eliminating the need for separate additive materials that could be extracted or separated.

The patent merges the heat storage function with the polyurethane matrix by chemically bonding heat storage-capable groups to the polymer chains. This integration ensures that the heat storage components cannot be extracted or separated, as they are chemically part of the polyurethane structure. The unified structure maintains both heat storage performance and compositional stability simultaneously.