The color pigment and the printing glaze
Pigment which is able to make objects with color material. The pigment of soluble and insoluble, the difference between inorganic and organic. Inorganic pigment is commonly mineral substance, humans have long known to use inorganic pigment, use colored soil and ore, the rock painting and daub on the body. Organic pigments derived from plants and Marine animals, such as blue, gambogic and Roman purple derived from shellfish.
Mainly used in coating, printing ink, printing and dyeing, plastics, paper, rubber and ceramic industries, with the rapid development of downstream industries, growing demand for paint, paint industry in China development prospect is very broad.
In 2011 China's import and export of dye and organic pigment were presented down trend. Among them, the dye exports of 243000 tons, down by 10.7% over the previous year; Foreign exchange earning $1.18 billion, an increase of 0.4% over the previous year. Organic pigments exports of 150000 tons, down by 2.7% over the previous year; Foreign exchange earning $1.18 billion, an increase of 15.8% over the previous year. Colourant import demand in China. In 2011, technical innovation of colourant domestic enterprises actively adjust the product structure, high-end varieties growing. As China's dyestuff industry status in the international market dye, dye imports maintained a downward trend year by year. Colourant imported large drop in 2011. Dye imported 42000 tons, compared to the same period by 16.5%, fell by 26.2% in June; Imports of $390 million, reduced by 10.4% over the previous year. Organic pigments imports of 19000 tons, 17.3% less than in 2010. Imports to $240 million, up 2.1% from 2010, see the Chinese paint industry production and sales forecast demand and investment analysis report.
(Pigment) used for coloring Pigment powder material. In the water, grease, resin, does not dissolve in organic solvents such as medium, but can be evenly dispersed in the medium and can make the medium color, and covering power. Art with the basic requirements of paint particles more exquisite and more good, color is more bright-coloured, the better, the more persistent don't change color, the better (stability). Watercolor watercolor except white, almost is transparent. In this way can meet the needs of the watercolor hood to dye.
Gouache is initially in watercolor to add white powder, make the color is not transparent and invention. Because the watercolor is transparent, so it is difficult to modify the once a bit. And gouache colour because the opacity can be easily modified. Later added in gouache gum Arabic and other raw materials to further improve the performance of it. Gum Arabic to gouache after working surface has a layer of gloss, but needs to be flat with special occasions (such as rendering and animation for coloring situation), rubber can be in surface irregular spots of color, or color is not uniform, so there are special degumming paint.
Oil paints are diluted oil paint.
Chinese painting is very rich in pigment, there are various types, kuangfen to plant extracts to animal extract, complex type.
Theoretically as long as there are red, green, blue three primary colors can bring up all of the other colours, but brought out the color of purity is high enough, so modern art paint manufacturers for a variety of hue and lightness color, production of high purity pigment to meet various needs. From the most basic color 12 to 24 and 48 color color usually to more than 60 color. Not including special metal color.
On the glaze is a kind of silicate, ceramics glaze applied by general with quartz, feldspar, clay as raw material, after grinding, water modulation, coating on the body surface, roasting and fused by a certain temperature, the temperature drop, formed on the surface of the ceramic glass sheet. It makes ceramics increased mechanical strength, thermal stability, dielectric strength and prevent the erosion of liquid and gas. Glaze and porcelain is beautiful and easy to wash the mop, dust contamination, and so on.
Attached to the ceramic billet vitreous body surface thin layer. With mineral raw materials (such as feldspar, quartz, kaolin and chemical raw materials in a certain mixing ratio and fine grinding into slurry liquid, on the body surface, through high temperature firing. From the microscopic structure, including glass material and a small amount of bubbles, not fused silica particles and precipitation of crystal. On cooling with similar physical and chemical properties of glassy state, impermeable, smooth and glossy, not easy to stain, and can improve the mechanical strength, thermal stability and chemical stability of the products. Glaze can also be used in a variety of decorative products to enhance the artistic effect of.
Glaze is covered on the surface of the ceramic, enamel, vitreous thin layer. Such as: 1 tang sancai glaze, prevailed in the tang dynasty, is burning tire body painted white, green, brown, blue glaze, the kiln temperature 800 c. When used as a funerary. 2 on the glaze color, in the good factor on coloured drawing or pattern, then through the low temperature drying and burning, because of the color attached on the glaze, so named. As early as in song dynasty. 3 under the glaze color, on the green coloured drawing or pattern, glazing after high temperature firing, color lines under the glaze, never fall off. As early as in tang dynasty. 4 youligong, copper oxide as reagent on the tire coloured drawing or pattern, glazing after high temperature drying white safflower, began in the yuan dynasty jingdezhen. 5 color, decorative pattern on the body with blue and white drew contour line, glazing after firing, within the contour line to fill in a variety of color, then through secondary burning, the fire picture under glaze blue and glaze color than fight, so named. Began in years. 6 piece, both the ice crack, glaze type with ice crack. Because of fetal, glaze different expansion coefficient, an early encounter cold air generated from the kiln, the elder brother of the song dynasty kiln as a main features. 7 blue, under the glaze color varieties, one of the cobalt oxide as reagent, painted in the embryo, mask in a transparent glaze, through 1300 degrees high temperature firing, blue and white set each other off, main porcelain of Ming and qing dynasties.
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