Systems and Methods for UV-Reflective Paints with High Overall Solar Reflectance for Passive Cooling

A passive daytime radiative cooling dry coating comprising:

• at least one pigment material;
• at least one binder material with a refractive index of less than 1.45;
• and
• wherein the coating has a solar reflectance of at least 0.94;
• and
• wherein the coating is applied as a dry coat on a substrate.

A method to cool an object comprising:

• applying at least one layer of passive radiative cooling coating on at least one surface of the object, wherein the passive radiative cooling coating comprises:
• at least one pigment material with a refractive index of greater than 1.5;
• at least one binder material with a refractive index of less than 1.45;
• and
• at least one solvent, wherein the at least one binder material is soluble in the solvent;
• wherein an absolute value of the difference between the refractive indices of the pigment material and the binder material is at least 0.1;
• and
• wherein the coating has a solar reflectance of at least 0.94.