Factors Affecting The Performance Of Organic Pigments
Pigment red 170 supplier said, when the organic pigment is used, it is in the state of fine particles uniformly distributed in the colored material, the physical structure of organic pigment particles, particle size, crystal shape and surface state can affect the incident light reflection, absorption and scattering ratio, which leads to the difference between the organic pigment color and various properties. Organic pigments with different chemical structures are very different from each other in terms of hue and color fastness, etc. Even in the case of the same chemical structure, organic pigments may exhibit different properties due to the differences in physical structure.
Enhance the formation of hydrogen bonding in the molecular structure to improve the firmness of pigments
In azo organic pigments, the negative substituent group in the diazo component and the positive substituent group in the coupling component have the ability to strengthen the formation of hydrogen bonding, and the intermolecular force of hydrogen bonding can improve the firmness of organic pigments. For example, pigment red 112 (permanent red FGR), pigment yellow 1 (sunlight-resistant yellow G) and so on, their pigment molecules contain internal hydrogen bonding structure, so they have better color fastness performance such as sunlight resistance.
Relationship between pigment molecular weight and performance
When the molecular weight of organic pigment increases, it can improve the performance of organic pigment such as heat resistance, solvent resistance, migration resistance, etc. For example, the molecular weight of benzidine yellow is about 600 to 800, which is much better than that of sunlight-resistant yellow with molecular weight of 400.
Introducing molecular groups into the structure to improve the color fastness of pigment
The introduction of molecular groups such as acylamino group, sulfonamide, sulfonic acid or carboxylic acid group, nitro group and chlorine or other halogens into the molecular structure of organic pigments can greatly improve the color fastness performance of organic pigments in terms of lightfastness, solubility and heat resistance.