Everyone know the metal complex dyes in the dyes industry. It is an synthetic dyes, non natural by chemistry. It is with outstanding performance in furniture, leather, dyeing. Metal complex dyes have many branches for which can be subdivided into many types. It is very popular for which ones contains chromium, cobalt etc.,
There was a acid complex dyes before in the early time of 19th century, the metal complex dyes we used was evoluted from that time, and now it is the fifth generation. The previous two generations are acidic medium of the dye, may be found in the corrosive acidic substances, so it was changed to neutral products from the beginning of the third generation. Which can be said to be a revolutionary change,and hit the market at that time.
By the fourth generation, the metal complex dyes with soluble sulfonic acid groups have been turned into.And the current fifth generation should have been technically developed to a perfect point, it is a kind of reactive dyes and there is a very famous proportion is 1:2: While even we are now in the development of the fifth generation, that does not mean the previous generations of products is completely eliminated, those one still have a unique advantage, especially for the second generation, which cover above the performance is perfect. will not appear to be fading phenomenon even after the sun. Today, the wool, cashmere, silk, fiber products are used for dyeing products with it.
But our development must be built on the basis of not destroying the environment, the socalled green products, sustainable development. And metal complex dyes contains some heavy metals, especially of chromium and cobalt above. even through some technical means under control, but on the ecological environment or a lot of lethality. That heavy metal is the biggest drawback of metal complex dyes, and also one of the problems to be solved in the future.