The function of defoamer in silicone coating is to prevent the coating from producing foam or bubbles during construction. The paint often contains volatile organic compounds, and bubbles will be generated when the paint is stirred and sprayed during construction. These bubbles will affect the smoothness and appearance of the coating, and even cause the coating to fall off or crack. Silicone coating defoamer can stabilize the liquid interfacial tension inside the coating, inhibit the generation of bubbles, make the coating construction process smoother and more uniform, and improve the quality and durability of the coating.