Low temperature ceramic pigment without lead on glaze

Abstract

This invention relates to a low-temperature lead-free overglaze pigment, which is composed of lead-free pigment 8-30 wt.%, and lead- and cadmium-free flux 70-92 wt.%. The flux is composed of: SiO2 30-60 wt%, B2O3 5-35 wt.%, Al2O3 1.5-15 wt.%, K2O 1.5-10 wt.%, Na2O 1.5-10 wt.%, Li2O 0-8 wt.%, ZnO 0-15 wt.%, CaO 0-5 wt.%, CoO 0-10 wt.%, BaO 0-5 wt.%, MgO 1-5 wt.%, ZrO2 0-10 wt.%, SnO2 0-10 wt.%, andTiO2 0-5 wt.%. The low-temperature lead-free overglaze pigment has such advantages as no toxic or side effects, compact structure, high chemical stability, low baking temperature, beautiful color, high resistance to acid and base, appropriate thermal expansion coefficient, good luster, good decoration effect, and simple preparation.

Description

technical field [0001] The invention relates to a low-temperature overglaze lead-free ceramic pigment, which belongs to the technical field of ceramic pigments. Background technique [0002] The most widely used decorative method for ceramic products is overglaze painting. The overglaze color is used at a low temperature of 750°C to 850°C, so 30% to 50% of lead oxide is added to the traditional production process to make the ceramic overglaze pigment have a wide range of firing temperature and pure color. However, during the production and use of lead in ceramic pigments, the pollution of air and water resources and the harm to human body have attracted worldwide attention, especially the dissolution of lead on the surface of tableware and drinking utensils is a potential carcinogen, which is harmful to people's health. threatening. In order to reduce and eradicate the poisoning of lead, the scientific research and production departments of the ceramic decoration industry ...

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Problems solved by technology

[0005] It is not difficult to see from the composition of the flux in these two patents that in order to replace the low temperature and bright characteristics of ceramic glaze pigments endowed by lead oxide, Bi has been applied to varying degrees. 2 o 3 The advantage of low melting point, but it is said that the toxicity of bismuth is no less than that of lead, especially Bi 2 o 3 The introduction of glass will easily lead to phase separation of glass, and it will not be easy to form a uniform glass body, resulting in loose flux structure, thus affecting chemical stability, acid resistance and alkali corrosion resistance will also decrease, and it will also cause color rendering of the toner in the flux. The baking temperature of its pigments is between 830-950°C, which is relatively high and consumes a lot of energy.

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