RU1796593C - Glazed dye for faience - Google Patents

Abstract

The dye contains, wt.%: Zirconium oxide 42.8-47.8, BF Zr02, silicon oxide 12.5-19.3 BF SJ02, chromium oxide 7.1 -11.5 BF SgaOz, sodium fluoride 4.2- 6.3 BF NaF, silicon fluoride 5.2-7.9 BF SIF4, sodium oxide 2.4-6.1 BF N320, zinc oxide 9.2-17.7 BF ZnO. Characteristics of the dye: tone purity 49-55%, reflection coefficient 20.0-22.2, firing temperature of the charge of the dye 1000 ° C. Ztab.

Description

The invention relates to the ceramic industry, in particular to a technology for synthesizing ceramic dyes for decorating faience. Known underglaze paint for olive-green colored faience containing chromium trioxide in an amount of 20.0-34.0 wt.%, Which in combination with aluminum oxide, iron, magnesium gives the paint a green tone at a high (1320 ° C) firing temperature charge of paint 1,

The closest composition is brown-green zircon pigment obtained by two-stage calcination (700-800 ° С and f250-1350 ° C), as well as using leaching with mineral acid (2).

The pigment tone in the underglaze decor is gray-green, the colorful coating has a fuzzy outline, color difference due to the increased effect of mineralizers (LIOH and NajSlFe) on the zircon-silica structure and the overestimated content of chromium oxide.

The dye manufacturing techniques are as follows: the starting components are mixed in the mixer in a dry way until 0.7 (100 holes / cm) passes through a sieve. The resulting mixture is poured into the capsule at 2/3 volume. The mixture is calcined at 1000 ° C. After firing, the dye is ground in a ball mill to a sieve residue of 0.3 wt.%. then dried at 80-120 ° C and sieved through a sieve No. 315 (445 holes / cm2).

In the manufacturing technology of the proposed dyes, in comparison with the known dyes, the firing temperature of the mixture is reduced, the operation of re-firing and acid leaching are excluded.

The dye is used in decoding by both manual and mechanized methods. The firing temperature is 1100 - 1160 ° C.

The purpose of the invention is the provision of a purity of tone 49-55%, reflection coefficient

t

Chv-yo

VJ o o yu yu

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20-22.2, as well as a decrease in the temperature of the firing of the dye mixture.

The invention is illustrated by the following examples (tab. 1,2,3).

The olive color of the dye is due to a combination of the optimum amount of zirconium and silicon oxides in a zircon-siliceous framework with a chromophore — chromium oxide and a modifier — zinc oxide in the indicated ratio. An olive paint tone is achieved with a certain imposition of pure spectral tones (yellow and green), and even a slight shift of these tones in one or another spectral region leads to a change in the given tonality.

The quality of the colorful surface, as well as the specified tone of the dye, is determined by the optimal amount of the crystalline phase of zircon, which is the basis for

the introduction of chromium and zinc oxides, which, acting as a modifier, contributes to the achievement of high technological effectiveness of the dye (it easily leaves the brush, the outline of the pattern is clear with various decorating methods). The decrease in the temperature of the firing of the dye mixture is caused by the content in its composition of the mineralizers Na2SIFe and MaaCO3.

The value of the dye is its use in decorating a wide range of fancy products using a variety of methods.

Claims (1)

The claims An underglaze olive dye for faience, including SiOa. Zr02, CrgO3, NaF and SIF4, characterized in that, in order to ensure a tone purity of 49-55%, a reflection coefficient of 20-22.2 and a decrease in the firing temperature of the dye charge, it additionally contains MaaO and The charge composition of the dyes ZnO in the following ratio of components, wt.%: SIU212.5-19.3 Zr02 42.8-47.8 Cr20z 7.1-11.5 NaF 4.2-6.3 SIFV 5.2-7.9 No. 20 2.4-6.1 ZnO 9.2-17.7 Table 1 The chemical composition of the dyes Physical and technical properties of the colorful surface table 2 Table 3