13 bone porcelain product decoration

To solve the problem of heavy metals such as lead, cadmium dissolution as follows. ( 1) Use unleaded bone porcelain glaze using lead-free bone porcelain glaze is the basic measures to solve the lead dissolution, only lead free bone porcelain glaze ( Flux) Add lead, cadmium pigments or parcel there are lead, cadmium, to satisfy increasingly demanding the dissolubility of lead, cadmium allow limit requirements ( 2) The use of lead and cadmium bone porcelain paint or resistant to acid and alkali mask layer material at present although lead-free wuxi pigment and resistance to acid and alkali mask layer material is less, but have this kind of consciousness. On the one hand is to choose do not contain toxic elements such as lead, cadmium bone porcelain color agent; On the other hand is to make the lead, cadmium and other toxic yuan plain agent in glaze or solvent insoluble ( Or as little as possible dissolution) To allow a limited. Should not be ignored is that although the use of lead and cadmium bone porcelain paint, but if you still continue to use lead fritted lead dissolution higher phenomenon may arise, 3) Appropriately raise colour roast temperature PbO volatile at high temperatures, appropriately increase the color baking temperature can not only make the color agent with the combination of bone porcelain glaze, and can make the partial melting agent to the bone porcelain glaze, made some lead volatile, so as to reduce the dissolution. But there are many bone porcelain glaze pigment ( Such as iron oxide red, cadmium selenium red, etc. ) And precious metals not high color baking temperature resistance, may be pale or & other; Flying gold & throughout; ( 4) Color roast bone China better ventilation in color baking kiln and make an issue of art is economical and practical method. By strengthening exhaust ventilation, reduce temperature difference, plus a reasonable size, optimize the color baking system, etc. , can reduce the lead dissolution. ( 5) Design picture as far as possible with lead, cadmium pigments bone porcelain color agent most does not contain toxic elements in the minority several available other color agent instead. For example: replacing antimony lead with titanium wrong chrome yellow, yellow yellow, cadmium yellow zircon lime to replace antimony tin ash, etc. , which requires the designer with pigment, when the design to minimize the use of lead, cadmium pigments. Using surface for bone porcelain dish, especially in contact with the food side as far as possible to reduce bone porcelain decoration, in order to reduce bone China lead dissolution. ( 6) Steam lead reduction in color baking kiln zhongtong into water vapor, can increase lead to evaporation, and in the bone porcelain paint surface form high silicic film make acid ( 7) Don't use ever burning lead glaze kiln long-term lead glaze or lead wire burning kiln, in which the bone porcelain surface adsorption amounts of lead, as lead-free bone porcelain product again into the kiln, lead content will be attached to the surface of a bone China, again lead dissolution. After this is also a lot of businesses use lead-free glaze, also found that the main reason for the lead dissolution ( 8) After other color and baked in an acid ( Chemical lead method) , the extension is obtained, roast time with acid coating. At present people to reduce bone porcelain tableware lead, cadmium dissolution amount of study, more strict, but bone porcelain tableware dissolution is not only in the lead, cadmium and barium, zinc, copper, chromium, antimony, arsenic, bismuth, etc. In the future, with the development of the society, people's health consciousness enhancement, considered poison and limit stripping element will be more. So when the adornment design bone porcelain glaze formula and dissolution of heavy metals should be fully considered to stand in the height of the environmental protection and human health, set the new idea of green chemistry and clean production, manufacturing more healthy bone porcelain products. — Tangshan bone China cups and saucers Chinese style is gone. 。 。 。 。 。