CS255381B1 - Means for forming of reflecting silver layer on glass surface - Google Patents

Abstract

The purpose of the solution is to reduce the amount of nitrate silver, especially when shot glass inserts to be insulated bottles, thermos and thereby reduce economic the difficulty of the silvering process. purpose is achieved by means of the creation reflective silver layer consisting of activating silver and reducing solution, where the activating solution contains 0.0265 g / l stannous chloride and 0.037 gram per liter of hydrochloric acid), the silvering solution contains 3.0 to 4.6 g / l silver nitrate, 2.7 to 3.6 g / l hydroxide potassium, 16.8 to 22.4 g / l hydroxide ammonium and 0.7 g / l of 1% ethanol iodine solution and the reducing solution contains 0.45 g / l d-arabinose, 0.55 g / l hydroxide sodium and 0.02 g / l of ethylenediamine.

Description

The invention relates to a means for forming a reflective silver layer on the glass surface, in particular on the surface of the thermos liner.

To date, the means used for silvering the interlining of glass liners into insulating bottles, thermos liners, consist of a silver solution based on an alkaline silver nitrate solution and a reducing solution based on an aqueous solution of sucrose inverted in nitric acid (Bardin, AN: Technologija optičeskogo63, stekla, 1963), (Dorochov, AK: Novyj sposob serebrenija steklla, Steklo i keramika 11, 1954, 11, 25—27), (Nifontova, ES: Reducing raschoda serebra in prozvodstva, Zekkal i keramika, 1948, 8, 8-10). Formaldehyde or sodium potassium tartrate may also be used as a reducing agent (Ryabov, VA, Borisova, S.S .: Chimicheskoje serebrenije aerozolej, Steklo, VNIIS, 1959, 1, 21-23), (Botvinkin, OK, Borisova, SS: Physico-chemical coating of glass in the form of aerosols, Glassmaker and Ceramics, 17, 1967, 10, 287-289) or glucose solution in combination with formaldehyde (Euder, FH: Die Spritz - Versilberung, GlasweJt, 21, 1968, 12, 542-545). A disadvantage of these reducing agents is that a concentration of 5.3 g or more of silver nitrate per liter of silver solution is required to produce a high quality silver layer, a high concentration which increases the economic complexity of the silvering process.

This drawback substantially limits the 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-based activation solution, silver nitrate-based silver solution, potassium hydroxide, ammonium hydroxide and ethanol iodine solution and carbohydrate base, the essence of which is that the activation solution contains 0.0265 g / l of stannous chloride 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 per liter of potassium hydroxide, 16.0 to 22.4 grams per liter of ammonium hydroxide and 0.7 g per liter of 1% ethanolic iodine solution and a reducing agent the 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 silver solution and reducing solution being 1: 1.

By using the reflective silver layer composition of the present invention, the silver nitrate concentration in the silver solution is reduced, providing a silver reflective layer reduced in the intermediate layer of the thermos flasks of the same quality. Reducing the concentration of silver nitrate will reduce the cost of producing glass liners for insulating bottles, thermos flasks.

The means for forming a 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, silver solution containing 4.0 g / l of silver nitrate, was used for silvering the glass inserts into% liter insulating bottles. 6 g / l of potassium hydroxide, and 22.4 g / l of ammonium hydroxide and a reducing solution containing 0.45 g / l of d-arabinose, 0.55 g / l of sodium hydroxide and 0.02 g / l of ethylenediamine. The ratio of reducing solution to silvering solution was 1: 1.

Using solutions of the above composition, a silver reduction time of 8 minutes of 0.0973 g was achieved, which is a 92.1% yield. The thickness of the silver layer was 0.156 μνα. The thermal insulating properties of glass thermosetting inserts complied with ČSN 703605.

Example 2

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

By using solutions of the above composition, a reduction of 0.0840 g of silver, which is a 69.2% yield, was achieved at a silvering time of 8 minutes. The thickness of the silver layer was 0.122 µm. Thermal insulating properties of glass thermos flasks complied with ČSN 70 3605.

Example 3

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

Using solutions of this composition, a silver yield of 0.0601 g of silver was achieved at a silvering time of 8 minutes, which is a 61.8% yield. The thickness of the silver layer was

0.116 jum. The thermal insulating properties of glass inserts complied with the standard ČSN 70 3605.

SUBJECT

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.