CS255381B1 - Means for forming a reflective silver layer on the glass surface - Google Patents

Abstract

The purpose of the solution is to reduce the amount of silver nitrate, especially when silvering the intermediate wall of glass inserts in insulating bottles, thermoses, and thereby reduce the economic complexity of the silvering process. The purpose is achieved by a means for creating a reflective silver layer consisting of an activating silvering and reducing solution, where the activating solution contains 0.0265 g/1 of stannous chloride and 0.037 grams per liter of hydrochloric acid), the silvering solution contains 3.0 to 4.6 g/1 of silver nitrate, 2.7 to 3.6 g/1 of potassium hydroxide, 16.8 to 22.4 g/1 of ammonium hydroxide and 0.7 g/1 of a 1% ethanolic solution of iodine and the reducing solution contains 0.45 g/1 of d-arabinose, 0.55 g/1 of sodium hydroxide and 0.02 g/1 of ethylenediamine.

Description

3 235381

BACKGROUND OF THE INVENTION The present invention relates to a composition for forming a reflective silver layer on a surface, in particular on a surface of thermos flake.

Up to now, the means used to clarify the separation of glass inserts into insulating bottles, thermos inserts, consist of a silver solution based on an alkaline solution of silver nitrate and a reducing solution based on an aqueous solution of sucrose inverted in nitric acid (Bardin, AN) : Technologijaoptičeskogo stékla, Moscow 1963), (Doro-chov, AK: Novyj sposob serebrenija sté-kla, Steklo i keramika 11, 1954, 11, 25–27), (Nifontová, ES: Sniženije raschoda sereb-ra v proizvodstve, Stéklo also ceramics, 1948, 8, 8-10). Formaldehyde and / or tartrate-sodium (Rjabov, VA, Borisova, SS, Chimicheskoje serebrenije by ae-rozol, Steklo, VNIIS, 1959, 1, 21-23) can also be used as the reducing agent, (Bot-vinkin, OK, Borisova, SS: Physico-chemical application of coatings on glass in the form of aerosols, glassblower and ceramics, 17, 1967, 10,287-289) or glucose solution in combination with formaldehyde [Euder, FH: DieSpritz - Versilberung, Glaswelt, 21, 1968 , 12, 542-545). A disadvantage of said reducing agents is that a concentration of 5.3 g or more of silver nitrate per liter of silver solution is required to form a quartz silver layer, a high concentration which increases the cost of the silvering process.

The aforementioned drawback substantially limits the means for forming a reflexed silver layer on the glass surface, preferably on the surface of a thermoset consisting of an activating solution on a stannous chloride base, a silver solution based on silver nitrate, sodium hydroxide, ammonium hydroxide and an ethanolic solution of iodine and a reducing agent the carbohydrate base solution, which is based on the fact that the activating solution contains 0.0265 g / l stannous chloride and 0.037 g / l hydrochloric acid, the silvering solution contains 3.0 to 4.6 g / l silver nitrate, 2 , 8 to 3.6 g / l of potassium hydroxide, 16.0 to 22.4 g / l of ammonium hydroxide and 0.7 g / l of 1% ethanolic solution iodine, and the reducing solution contains 0.45 g / l of d-arabinose, 0 55 g / l of sodium hydroxide and 0.02 g / l of ethylenediamine, the volume ratio of the silver solution and the reducing solution being 1: 1.

By using a refractive silver film forming agent according to the invention, the silver nitrate concentration of the silver is reduced by a silver solution, whereby the silver layer is reduced to reduce the uniformity of the same. By reducing the nitrate concentration, the cost of manufacturing glass inserts in insulating bottles, thermos, is reduced.

The means for forming the reflective silver layer is illustrated by the following examples. Example 1

An activating solution containing 0.0265 g / l of stannous chloride and 0.037 g / l of hydrochloric acid) was used to eject the glass inserts of š2 liters of insulating bottles, a silvering solution containing 4.0 g / l silver nitrate potassium hydroxide, and 22.4 grams per liter of ammonium hydroxide, and a reducing solution containing 0.45 grams / liter of d-arabinose, 0.55 grams / liter of sodium hydroxide, and 0.02. g / l ethylenediamine. The ratio of reductant solution to silver solution was 1: 1.

By using solutions of the above composition, a reduction of 0.0973 g of silver, i.e. 92.1%, is obtained at a silvering time of 8 minutes. Coarse silver layer 0.156 μΐη. Thermal insulation properties of glass thermos inserts conform to ČSN 703605. Example 2

An activating solution containing 0.0265 g / l of stannous chloride and 0.0367 g / l of hydrochloric acid, a 4.6 g / l solution of nitrate, was used to fire the glass inserts of the vials. silver, 3.6 g / l potassium hydroxide and 22.0 g / l ammonium hydroxide and a reducing solution containing 0.45 g / l d-arabinose, 0.55 g / l sodium hydroxide and 0.02% g / l ethylenediamine. The ratio of reductant solution to silver solution was 1: 1.

Using the solutions of the above composition, at a silvering time of 8 minutes, the production of 0.0840 g of silver, i.e. 69.2%, was obtained. The silver layer thickness was 0.122 µm. Thermal insulating properties of glass thermos inserts conform to ČSN 70 3605. Example 3

An activating solution containing 0.0265 g / l stannous chloride and 0.037 g / hydrochloric acid, a silvering solution containing 3.0 g / l silver nitrate, was used to excite the V2 liter glass inserts. , 2.9 g / l potassium hydroxide and 16.0 g / l ammonium hydroxide and a reducing solution containing 0.45 g / l d-arabinose, 0.55 g / l sodium hydroxide and 0.02 g / l ethylenediamine. The ratio of reductant solution to silver solution was 1: 1.

By using solutions of the above composition, an 8 min.

Claims (1)

SUBJECT A means for forming a reflective silver layer on the glass surface, in particular on the surface of the thermos liner, consisting of a stannous chloride activating solution, a silver nitrate silvering solution, potassium hydroxide, ammonium hydroxide and an iodine ethanol solution and a carbohydrate reducing solution, that the activation solution contains 0.0265 g / l of tin (II) chlorideVYNALEZU and 0.037 g / l of hydrochloric acid, the silver solution contains 3.0 to 4.6 g / l of silver nitrate, 2.8 to 3.6 g / l of potassium hydroxide 16.0 to 22.4 g / l of ammonium hydroxide and 0.7 g (11%) of an iodine ethanol solution, and the reducing solution contains 0.45 g per liter of d-arabinose, 0.55 g / l of sodium hydroxide, and 0.02 g / l ethylenediamine, the volume ratio of silver solution and reducing solution being 1: 1.