SU997129A2 - Method of increasing lumiscent lamp light flux - Google Patents

Description

This invention relates to the electrical industry and. can be used in the manufacture of luminescent lamps. I

According to the main author. St. No. 826459 discloses a method for increasing the stability of the luminous flux of fluorescent lamps, including the simultaneous washing of tube flasks and the application of a protective film by watering an aqueous solution of oxal salt (oxynitrate) calcium aluminium (CaO-A1203N205H 20), as well as drying it at 70-90 ° C for 2 5 min. Cll.

However, this method does not provide a uniform and complete coverage of the entire inner surface of the tubes of the fluorescent lamps with a protective film, which leads to a partial diffusion of alkali metal ions into the phosphor layer; leads to a large consumption of film-forming material.

The aim of the invention is to increase the efficiency of the known method.

The goal is achieved in that according to the method, 1-30 vol.% Of an organic compound, for example acetone, which reduces surface tension, is added to an aqueous solution of calcium oxalonium salt, and the coating is carried out under a pressure of 0.3-0.6 MPa .

Example 1. To a water solution of the calcium oxalic acid salt of the composition CaO-AlgO j-Nj OjHgO is added 1 vol.% Acetone, which absorbs the surface tension. The resulting mixture is sprayed onto the inner surface of tubes 10 flasks under a pressure of 0.5 MPa. Then the flasks are dried at 90 ° C for 3 minutes. A phosphor suspension is deposited on a film-coated glass tube. The addition of 1 vol.% Acetone reduces the surface tension of the mixture on the glass, which makes it possible to form a film leading to the effective protection of the phosphor coating from diffusion from the bulk of the glass of ions.

20 alkali metals. This provides an increase in the stability of the luminous flux of standard fluorescent lag-t type LB40 in the course of its service life by 1.5% compared with the known

25 way.

Example 2. To an aqueous solution of oxysol calcium-aluminum composition CaO A1203-N205H20. add 16ob. of scruton reducing surface 30 | ndt zhenye. The resulting mixture is sprayed.

on the inner surface of the tubes with a pressure of 0.5 MPa. The flasks are then dried for 3 minutes. A phosphor slurry is applied to the film-coated glass tube. The addition of 16 vol.% Acetone lowers the surface tension of the mixture on glass, which makes it possible to form a film leading to the effective protection of the phosphor coating from diffusion of alkali metal ions from the glass bulk. This ensures the stability of the luminous flux of standard fluorescent lamps LB40 during the service life by 2% compared to a known method;

Example 3. To a water solution of calcium oxyalcium oxo salt, CaO-Ali Oj-N 20j-H20, 30% by volume of acetone, which lowers the surface tension, are added. The resulting mixture was sprayed onto the inner surface of the factory-flask under a pressure of 0.5 MPa. The flasks are then dried at 70 ° C for 4 minutes. A J I binnestrate suspension was applied to a film-coated glass tube. The addition of 30 vol.% Acetone lowers the surface tension of the mixture on the glass, which makes it possible to form a film leading to effective protection of the phosphor coating from diffusion from the volume of the glass of alkali metal ions. This provides an increase in the stability of the luminous flux of standard fluorescent lamps of the type LB40 during the service life by 2% compared with the known method.

The use of this method in fluorescent lamps of various colors and powers also lead

to increase the stability of their luminous flux. As the fluorescent lamp power increases, the percentage increase in the stability of the light flux increases. Of all the examples given, the best results were obtained when treating glass tubes according to example 2.

The proposed method makes it possible to form a film that effectively protects the phosphor coating from diffusion from the bulk of the glass of alkali metal ions. This provides an increase in the stability of the luminous flux of standard fluorescent lamps of the type LB40 during the service life by 1.5-2% compared with the known method.

The economic effect of using the proposed method amounts to a total of 63 million pieces in the industry as a whole. lamps - 1449 thousand rubles.

Claims (1)

1. USSR author's certificate No. 826459, cl. And 01 J 9/22, 1979.