Method for coating inner wall of fluorescent tube with nano titanium dioxide

Abstract

The invention discloses a method for coating an inner wall of a fluorescent tube with nano titanium dioxide and belongs to the field of fluorescent tube manufacturing. A 2 to 2.5 percent thin aqueous solution of nano titanium dioxide is used to be coated on the inner wall of the fluorescent tube, and preferably the grain diameter of the nano titanium dioxide is less than 60 nanometers. Thus, the initial luminous flux of the inner wall coating is no less than that of the common aluminium oxide inner wall coating, but the black sodium amalgam is reduced to a required degree, the 2,000 hour lumen constantly increases by 5 percent, so the fluorescent tube meets market requirements.

Description

technical field [0001] The invention relates to the field of fluorescent lamp tube manufacturing, in particular to a method for coating the inner wall of a fluorescent lamp tube with nano-titanium dioxide Background technique [0002] The glass tube materials used in the manufacture of compact fluorescent tubes in my country generally have a high sodium content. With the compaction of fluorescent lamps, the tube wall load of the tube is further increased, the working temperature of the tube is also continuously increased, and the increase in the temperature of the glass tube is accelerated. Thermal diffusion of sodium ions in glass. These sodium ions will diffuse from the interior of the glass to the inner surface of the glass tube and react with mercury atoms to form black sodium amalgam. On the one hand, the black sodium amalgam generated on the surface of the phosphor particles will absorb the exciting ultraviolet rays irradiated to the surface of the phosphor particles w...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that too high a concentration of nano-titanium dioxide coating causes the reduction of initial luminous brightness, and too low a concentration of nano-titanium dioxide coating causes more black sodium amalgams. For this, we have carried out a large number of experiments , the conclusion that we draw is also the technical scheme that the present invention proposes, promptly uses the titanium dioxide coating of 2-2.5% nanometer titanium dioxide water dilute solution, the particle diameter of the best nanometer titanium dioxide is below 60nm, in this case, both can Compared with the commonly used aluminum oxide inner wall coating, the initial brightness is not reduced, and the black sodium amalgam can be reduced to the required level. The 2000h lumen maintenance rate is increased by about 5%, thus meeting the market requirements.