What is Effect of Water On Organic Pigments
PY151 pigment manufacturer says that organic pigments are organic compounds that are insoluble in water and are added to the substrate in a highly dispersed state and cause the substrate to be colored.There is no affinity between the organic pigment and the coloring object, and it is adhered to the surface of the coloring object through a film-forming substance or binder to achieve the purpose of coloring the object.
Organic pigments are a class of insoluble organic compounds with high coloring power. It differs fundamentally from dyes in that dyes are soluble in the dyeing medium used, whereas pigments are neither soluble in the medium in which they are used nor in the substrate being colored. By insoluble, we mean that their solubility in water, organic solvents and various application media is extremely small. Since organic pigments are insoluble in water, they may come into contact with water in the course of their use, so what effect does this moisture have on organic pigments?
The surface particles of organic pigments have a high energy content, so their surfaces are always adsorbed with a lot of substances, and moisture is one of them. However, the moisture referred to here is wet storage water, which is water adsorbed on the surfaces of organic pigments, and does not include the water bound to the chemical components.
It is impossible to keep the surface of an organic pigment absolutely free of moisture, even if it is baked dry, once it is exposed to the air, it will still adsorb some water until it is balanced with the ambient temperature and humidity.
Of course, organic pigments containing appropriate moisture is very necessary, the existence of moisture in the pigment to a certain extent, will affect its dispersion in the paint grinding, this is a very big impact, if the moisture in the organic pigment is too low, it will be difficult to grind, and will easily lead to too much moisture to produce some anti-coarse phenomenon.
Normally, moisture is a flocculating agent for pigment preparations, and the presence of the right amount of moisture in a pigment will not cause excessive flocculation. Therefore, the presence of moisture will affect a series of properties of organic pigments, such as color and light, oil absorption, etc..
Therefore, according to different organic pigments in different circumstances of the use of the environment, the reasonable moisture content of different organic pigments, general organic pigment moisture does not exceed 1%, while inorganic pigments such as carbon black can be specified as high as 10% or so of the moisture.
The above is our analysis of the impact of organic pigments in contact with water, we need to pay attention to the process of using organic pigments in contact with water, and pay attention to the preservation of dry sealing.