Interference reflection reducing coating of solar energy heat collecting tube external tube

The utility model discloses an interference reflection-deducting coating for outer pipe of solar heat collection pipe, which comprises three composite coatings, a first TiO2 coating, a second SiO2 coating, and a third TiO2 coating are arranged on a substrate (Borosilicate Glass) in order, the first TiO2 coating is 65-120nm thick, the second SiO2 coating is 60-170nm thick, and the third TiO2 coating is 605-120nm thick, the transmission rate of solar heat collection pipe that is spread with the coating is improved greatly. The interference reflection-deducting coating adopts medium-frequency twin magnetic control jetting method for preparation. The interference reflection-deducting coating is characterized in having full interference to the wide wave length of visible light and infrared light, the coating preparation has simple process, convenient operation, easy control, obvious process cost reduction, production period shortening, stable jetting condition, and is suitable for double layer solar heat collection pipe.