DE112761C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

The present invention is a method for the production of new color bodies, which consist of copper barium silicates and for the production of paints, as well as for ceramic purposes can be used.

It is well known that in antiquity a blue mineral paint was made from copper and lime, numerous specimens of which have been found in Egypt, Judaea, Italy, and France are. The secret of this fabrication was long lost, and it is only at the beginning that it is this It was found again by Darcet in the 19th century, but his method was not announced.

Some details about the means of recreating the ancient blue were made first made by 'Fontenay in 1874. In 1889 Fouqui showed that this was the case this body a definite crystallized combination of composition

(Si O ₂ ) _i Ca OCuO

At present this blue is manufactured only to a small extent, since its manufacture associated with difficulty. In addition, the usability of the product restricted by the fact that. it is fickle in the heat.

The heating must be continued for a very long time to produce the aforementioned blue color and take place at a very specific temperature, below which the formation of blue does not occur, while above the same immediately decomposition takes place. Finally you need lime, copper and alkaline fluxes are used in a certain ratio that must be strictly observed, otherwise the Formation of blue is prevented at all. The blue can also only be used under very limited conditions Conditions to be added to the cullet or the glaze of clay ware ..

One could now assume from the outset that Baryte and Strontian are among them Similarity to lime, would provide similar blues, but they are in this direction Attempts made by Fouqui were unsuccessful. The experimental conditions under which when applying lime a purer and more beautiful blue emerged than was previously available, followed According to him, the replacement of the lime by other alkaline earths does not lead to any result.

It has now been possible to determine the conditions for the formation of a barite and Strontian blue are favorable, and it has been found that barite blue is related completely different from lime blue in terms of color tone, speed of formation and persistence is. It has also been shown that violet compounds are also obtained which can be caused by the lime compound

are distinct and crystallized compounds of the formulas

(Si OJ ₂ Ba O Cu O,
(Si 0.J ₃ Ba O Cu O, (Si O ₂ ) _i BaOCuO

correspond.

In general, the violet is mixed with the not in the representation crystallized blue, which corresponds to compounds principally of the formula

(Si O ₂ ) _i Ba O CuO

approach or have an even higher content of silicic acid anhydride:

The present invention is now the method described below for Presentation of these new products.

Silica anhydride in the form of quartz sand is essentially used as the starting material or in another form, a suitable barium compound (carbonate, hydroxide, superoxide, Silicate, nitrate, etc.) and a copper compound (oxide, carbonate, silicate, nitrate, etc.). If necessary, can, depending according to the application, or flux, such as glass, sodium or potassium carbonate, Sodium or potassium silicate, may be added to facilitate the reaction and the To increase the tightness of the product. Likewise, clay materials such as clay, Kaolin, porcelain, stoneware or earthenware mass, can be added to the original To make the mixture plastic and to facilitate the shaping of the same.

The relation of these different constituents to one another can be within wide limits can be changed without affecting the formation of blue and violet, however, the heating conditions and the color tone change at the same time becomes another.

In the following some examples for the representation of barite blue are described without that the feasibility of the procedure would be limited to the numbers given.

Example i.

An intimate, finely ground mixture of
30 parts of silicic acid anhydride,
49 - barium carbonate,
20 - copper oxide,
according to the formula

(Si O ₂ J ₂ Ba O Cu O,

is heated to 1050 ^{0 for} one hour and produces a very rich violet-tinged blue, the tone of which differs very much from that of the blue obtained by means of lime. The product remains in powder form.

Example 2.
A mixture of

375 parts silica anhydride Si O ₂ ,
265 - barium carbonate Ba C O ₃ ,
70 - copper oxide Cu O,
42 - Sodium bicarbonate Na HC O ₃ , according to the formula

(Si O ₀ J ₂₅₀ (Cu O) ₃ , (Ba O) ₆ , (Na ₂ O) ₁₀ ,

is without DAF fine powders or intimate mixing of the components would be necessary in 1200 to ⁰ melted and then held for another hour at 1000 ^0th

A very pure blue is obtained, which is similar to the most beautiful lime blue. the The mass clumps up a bit, but it is pretty easy to grind.

Läfst to cool the resulting melt at 1200 ⁰ quickly in air without heating anew, the result is a melt blue with yellow stitch and of great hardness.

Example 3.
A mixture of

75 parts of silicic acid anhydride,
54 - barium carbonate,
18 - copper oxide,
15 - white clay,
according to the formula

(Si OJ ₂₇₀ (AL ₂ OJ ₁₀ (Ba 0) _Sb (Cu O) ,,,

is sufficiently plastic to be shaped and provides one when heated purple porous mass.

Example 4.

If you have a mixture that is also plastic

250 parts of barite blue,
50 - blue glass,
50 - white clay,
in which

the barite blue

600 parts of silicic acid anhydride,
382 - barium superoxide,
120 - copper oxide,
240 - sodium bicarbonate

is obtained by heating to 950 to 1000 ⁰ , while the blue glass is off

120 parts of silicic acid anhydride,
12 - copper oxide,
40 - sodium carbonate
is created by heating until it melts,

heated again, a product of the average composition is obtained

76 parts of silicic acid anhydride,
6 - aluminum oxide,

22 - copper oxide,

35 - barium oxide,

14 - sodium oxide,
according to the formula

(Si O ₂ J ₁₇₀ (AL ₂ O ₃ ; _so (Cu OJ ₃ , (Ba O) ₃₃ (Na ₂ OI ₃₃ .

Is obtained from this mixture on heating to 920 ⁰ a dense, semi-glazed deep blue ground.

Similar mixtures can be made with innumerable variations depending on what is to be achieved Purpose to be made. One obtains z. B. vitrified masses or non-vitrified frits whose Color goes from blue to dark blue, by adding lime, magnesia, strontian, Alumina, zinc oxide, tin oxide, antimony oxide or glass bodies such as crystal glass, white Glass in different proportions, or by modification, depending on the desired tone the heating temperature.

The color bodies obtained in this way have the following properties. The color is strong and depending on the mixture used and the heating conditions, different from Going green over blue to purple. Finally the products are permanent, so are they Very differently composed basic compounds can be added without this the color is destroyed.

Among other things, the violet-blue barite paints can be used to produce paints for all Kind, such as oil paints, watercolors, glue paints, etc., also for coloring the shards of Pottery, glasses and semi-glazed masses and for the production of glazes All kinds of clay ware are used.

Claims (1)

Patent claim: Process for the production of paints, clay and glass ware and similar suitable green to blue and violet copper barium silicates, characterized in that silica with barium and copper compounds with or Without the addition of alkaline solvents and clay materials, as well as metal oxides or glass substances are heated until they melt or frit, after which, if necessary, another Heating at a lower temperature follows.