DD224026A1 - Process for producing pink colors - Google Patents

Abstract

The invention relates to a process for the production of pink inks for the ceramic industry. The object of the invention is the development of a method for the production of pinks, in order to reduce the production cost considerably and to improve the processability of the paints for painters decorations significantly. The invention has for its object to develop a mixture for the production of pinks. According to the invention, the object is achieved by mixing the raw materials SiO 2, SnO 2, CaCO 3, Cr 2 O 3 and H 3 BO 3 according to the composition of the pink color body 2 CaOSnO 22 SiO 2n B2O 3 with 0.1-0.5% Cr 2 O 3 with a n 0.078 mol to n 1 mol or the raw materials CaCO3 and H3BO3 are combined and made into 2 CaOn B2O3 and then mixed with SiO2, SnO2 and Cr2O3 and fired. The fired colorant is finely ground with other raw materials such as PbO, CaCO3, SiO2 or 2 CaOB2O3 to the pink color. The invention can be used for the production of pink colors and thus for the decoration of ceramic products.

Description

Applicant -2 "'

VEB Vereinigte Porzellanwerke Kahla

Parent company of the VEB Kombinat Feinkeramik ~ ^

6906 Kahla Ernst-Thälmann-Str. 33

Title of the invention

Process for producing pink colors.

Field of application of the invention

The invention relates to a process for the preparation of.

Pink for the decoration of ceramic products.

Ch arakteristik the known technical solutions There are known methods in which is prepared by firing a mixture of tin dioxide and chalk with or without silicon dioxide and with or without small amounts of boron trioxide or boric acid of the color body. The mixture contains up to 1.5% chromium-III-oxide. Its effect as a ceramic paint is achieved by adding to the fired mixture of CaO-PbO-SiO ^ -containing rivers The burning of the color body is carried out after remote elections at temperatures up to 1400 ⁰ C, sometimes even several times burned. In each case, tin dioxide is used as the basis for producing the pink color body.

The patent DAS 14 17 251 describes the preparation of stable mixed phases with pigment properties on the basis of tin dioxide, wherein the host lattice of the SnO _? 6- or 5-valent cations, as well as 1-, 2-, or 3-valent cations with an ion wheel of from 0.45 A to 0.97 α . , The patent DAS 12 66 462 describes a method for. Prevent local discoloration in the coloration of glazes by Pinkfarbkörper. The color body are oxidizing agents, eg. For example, cerium oxide is added to a reduction

. ''.'' .. &%

to prevent the color body. >

In the patent OS 30 23 941 a process for the production of pink colors is described, wherein the color body on the basis of calcium-tin-silicon-chromium oxide and zirconium 'titanium chromium oxide is synthesized. In addition, 0.01%., ^! to 10% bismuth and / or phosphorus or 0.1 % to 5% bismuth and / or phosphorus, especially in the form of oxides

contain.

The currently used methods for the production of pink color bodies based on the system CaO-SnO ₂ -SiO ₂ , wherein the structure of the titanite CaTiSiO- is sought .. The. Optimal. Synthesis temperature of CaSnSiO ₅ is given as 1350 ⁰ C. The main components are in the ratio CaO: present marry well 1: SnO _2: SiO _£ = 1: 1.

According to Tumanov and Filippova (Steklo i Keramika 25 (1968), ^ 4, s'. 37-39) is a pink color body d, he composition 2 CaO., SnO ₂ . -2 SiO _£ .0,012 Cr ₂ O ₃ to be regarded as optimal. An addition of a maximum of 2% B ₂ O ₃ is used as a mineralizer. The firing temperature was 1350 ⁰ C, wobei.sich a subsequent fine grinding and a second fire at the same temperature positively to the 'color development impacted. For the fired Pinkf arbk.örper a PbO and CaO-containing flow is used. The flow is melted and finely ground added to the color body. The known processes * for the production of pink inks are expensive. They assume that a thermally stable, defined composite color body using high temperatures up to 1400 ⁰ C, in a subsequent fine grinding and partially Γη a second fire produced and mixed by subsequent mixing with a separately manufactured, characterized by melting and fine grinding flow , In addition, the pinks prepared by the known methods for both. Processing with a brush as well as paints difficult to paint and lead to a reduction in labor productivity. When using such manufactured pinks completes

in decorative firing re-crystallization with partial release of tin oxide, so that the cost of paint production is not justified.

Object of the invention

A method of producing pinks is to be developed with the aim of significantly reducing the production cost and substantially improving the processability of paints for painter's décors.

'16 Principle of the invention The invention has for its object to develop a mixture for the production of pink color, with the manufacturing costs of pink colors is significantly reduced and the workability of the colors for painting designs improved considerably

 According to the invention this is achieved in that

- a mixture of the raw materials silica, calcium carbonate, tin dioxide and chromium-III-oxide wet finely ground in water or alcohol and dried and then this mixture boric acid <1 mm grain size is added or

- that from the finely ground present raw materials silicon dioxide, calcium carbonate, tin dioxide and chromium dioxide and boric acid <1 mm grain size dry color body offset is mixed or

- That the raw materials calcium carbonate and boric acid <1 mm grain size are to be mixed according to the composition of the color body to glow at 900 ⁰ C to 1100 ⁰ C and then feinzumahlen with the raw materials silicon dioxide, tin dioxide and chromium-III-oxide.

In all three ways the colorant mixture of the composition is 2 CaCO ₃ + SnO ₂ + 2 SiO _p + HH ₃ BO ₃ (n ^ 0.156 mol to η = 2 MoI) with 0.1 % to 2.0% Cr "0 _Q

correspondingly at 900 ⁰ C to 1250 ⁰ C to burn.

After Bren'nen the Farbkörp'ers according to the invention, the raw materials silica, lead oxide, calcium carbonate and / or calcium borate together with the fired color body to Pi'nkfarbe vermah len / wherein the proportion of Pinkfarbkörper is 30% to 70 % .

^x . ,

Execute un gsbe ispiel.

The invention is explained in more detail by the following examples:

, , ';

Example 1 :; -

According to the composition of the color body, the following mixture is composed:

34% to -42% CaCO ₃ '26% to 32% SnO ₂

^Λ "2% to 15% H ₃ BO ₃ 22% to 26% SiO

0.1% to 2.0% Cr ₂ O ₃ . The mixture is finely ground without boric acid in an alcohol suspension with porcelain balls or flint stones. After drying, the intended amount of boric acid <. 1 mm grain size of the finely ground mixture and then fired at 1100 ⁰ C. The resulting pink color body is finely ground with the raw materials in the following ratio:

30% to 70% pink color body 6.5% to 15% SiO ₂

, '25 % to 60. % PbO ',

, 6% to 13% CaCO ₀

Be 2 ,

ι According to the raw material mixture for the color bodies according to Example 1 was finely ground calcium carbonate and boric acid ^ l Liim particle size are dry-blended and fired at .1000 ^'0 C for 1 hour. The resulting calcium borate, together with the other pigment raw materials, is suspended in alcohol.

diert and finely ground. The dried Farbkörpermi research is fired at 1100 ⁰ C for 1 hour. The color body is finely ground with other raw materials in the following ratio to the pink color:

10% to 25 % PbO

S% to 15 % SiO ₂ 10% to 25 % 2 CaO. B ₂ O ₃ 30% to 70% pigment

Claims (1)

Process for the production of pink inks for ceramic products, characterized in that according to the composition of the pink color body 2 CaO.SnO ₂ . with 0.1% to 1.5 with a 2 SiO ₂ . nB ₂ < ^ η> 0.073 iVloi to n = 1, Viol dia Raw materials Silica, Finely ground and after drying with boric acid <1 mm grain size mixed or the raw materials calcium carbonate and boric acid and calcined at 900 ⁰ C to 1100 ⁰ C and then with 'the raw materials tin dioxide, silicon dioxide - finely ground oxide and chromium-III-oxide, the raw material, mixture at "900 ⁰ C to 1250 ⁰ C burned and finely ground with other raw materials such as lead oxide, calcium carbonate, silicon dioxide or calcium borate to pink color. Method according to claim 1, characterized in that. the mixture for the pink color body from 34 % to 42% CaCO ₃ , SnO -26% to 32% 2 % to 15% : 22% to 26 % 0.1% to 1.5% Cr ₂ and after firing with 6.5% to 15% SiO 2 25 % to 60% • 6% to 13% 30% to 70 H ₃ BO ₃ , SiO ₂ and PbO, CaCO and Pink color body or 10 % to 25 % PbO 36 /. 8% to 15% SiO ₂ , ':' 10% to 25% 2 CaO 30 % to 70% pink color body is mixed together. B ₂ O ₃ and