SU1211237A1 - Method of producing glass with coating - Google Patents

Description

one

The invention relates to the production of glass for lighting purposes, in particular opaque light scattering glasses for equipment. transport, as well as architectural and construction parts.

The aim of the invention is to obtain glassware with a stable and uniform dispersion of 70-80%.

The light scattering of powders is due to the presence of a bounding particle surface. With sufficiently strong adhesion of the dispersed particles to the transparent substrate, glassware will have a certain value of light scattering.

In order to obtain glass for lighting purposes with given transmission (70-80%) and reflection (10-20%), it is necessary and sufficient that the average size of dispersed particles applied to the coating be within 20-60 µm with a thickness of

applied coating layer exceeding 25 lighting characteristics of the obtained glassware.

3 to 50 times the average particle size

The proposed narrow fractional composition and the limiting size of the layer provide for the formation of the coating the formation of isolated gas bubbles of a certain size depending on the size of the dispersed particles and in an amount determined by the thickness of the layer of the applied coating. The consequence of this is the production of glassware with given light scattering parameters.

The uniformity of the light scattering of the glassware obtained by this method is ensured by the uniform distribution of gas pores on the substrate surface due to the narrow fractional composition of the coating particles.

The stability of the light diffusion of the glassware obtained by the proposed method is due to the fact that the melting is carried out at a temperature on the surface of the coating not lower than Tg + +, i.e. by applying heat only to the surface of the coating deposited on the substrate. The firm adhesion of the coated substrate, according to the proposed method, is provided by high-speed (at least 100 C / s) heat supply, for example, radiation to the surface of the coating, before it is heated to a temperature not lower than Tg + 200 C.

211237J

Under these conditions, the alloying of the particles of the coating of the chosen fractional composition occurs first between themselves on the surface of the coating and then

5 to the entire depth of the coating before fusion with the substrate, with the fusion of gas volumes providing light scattering. Open gas bubbles on the surface are not detected, because

10, said flashing mode — heating from the surface of the coating for a time sufficient to firmly adhere the coating to the substrate without deforming the latter, results in the formation of a smooth shiny surface of the glass.

The method is applicable to glasses of any composition, due to the fact that glass with the same composition as the substrate is used as a coating. This eliminates compliance with the requirements for the consistency of the glasses for the bullpen. In tab. 1 shows the parameters of the proposed method, in table. 2 5 lighting characteristics po5

0

glasswares

The invention is illustrated with specific examples.

Example 1. Sodium-calcite-silicate glass (VVS) Tg 580 ° C was taken as the substrate and the coating. The average particle size of the glass coating is 20 µm; the method of coating is by spraying an aqueous suspension to a layer thickness of 700 µm. The ratio of particle diameter (0):: layer thickness (D) is 35. After drying, the coated glass is heated to melt with a powerful source of IR radiation. Received fit glassware.

The application areas of the proposed glass products obtained by the proposed method are determined by the lighting parameters, in particular glass products can be used in lighting devices, for side glazing of vehicles, tailors, or by increasing the thickness of the substrate glass to 4-6 mm as internal partitions of architectural and architectural components. destination.

Due to the effect of healing the substrate surface defects and increasing the thickness of the glassware due to the summation of the substrate thickness and the thickness of the fused coating, the glassware has increased mechanical strength.

0

five

Table 2

73

85 86

20

12 10

Compiled by G. Burovtseva Editor M.Nedoluzhenko Tehred Z.Kastelevich Proofreader S.Shekmar

Order 604/28 Circulation 458 Subscription

VINILI State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, Proektna str., 4

Table 1

(Continuation of table 2

4 5, 6 7 8

90 88 80 70 87

five

10 10 13

eleven

Claims (2)

1. METHOD FOR PRODUCING GLASS WITH COATING, including applying a coating of finely dispersed glass particles to a glass substrate and then melting it, characterized in that, in order to obtain glassware with stable and uniform dispersion of 70-80%, the coating is applied from the glass substrate with with an average particle size of 20-60 microns, the coating thickness exceeds the average particle size by 3-50 times, and reflow is carried out at a temperature on the coating surface of at least Tg + 200 ° C for 20-90 s. 2. The method according to π. 1, characterized in that, in order to expand the range of glassware for lighting purposes, · dyes are introduced into the coating in an amount of 0.01-0.5 wt.% By weight of the dry coating. ·