Coloring pigments are the most important raw materials in tinting technology, and their properties must be fully understood and applied flexibly, so that high-quality, low-cost and competitive colors can be formulated.
Commonly used pigments for plastic color matching include inorganic pigments, organic pigments, solvent dyes, metal pigments, pearlescent pigments, magic pearlescent pigments, fluorescent pigments and whitening pigments. In the above materials, we need to make it clear that there is a difference between pigments and dyes: pigments are not soluble in water or in the medium used, and are a class of colored substances that color the coloring matter in the state of highly dispersed particles. Pigments and organic pigments. Dyes are soluble in water and organic solvents, and can be combined with the dyed material by a certain chemical bond. The advantages of dyes are low density, high tinting strength and good transparency, but their general molecular structure is small, and migration is easy to occur during coloring.
Inorganic Pigments: Inorganic pigments are generally classified by production method, function, chemical structure, and color. According to the production method, it is divided into two categories: natural pigments (such as cinnabar, verdigris and other mineral pigments) and synthetic pigments (such as titanium dioxide, iron red, etc.). According to the function, it is divided into coloring pigments, anti-rust pigments, special pigments (such as high temperature pigments, pearlescent pigments, fluorescent pigments), etc. Acids, etc. According to the chemical structure, it is divided into iron series, chromium series, lead series, zinc series, metal series, phosphate series, molybdate series, etc. According to the color, it can be divided into the following categories: white series pigments: titanium dioxide, zinc barium white, zinc oxide, etc.; black series pigments: carbon black, iron oxide black, etc.; yellow series pigments: chrome yellow, iron oxide yellow, cadmium Yellow, titanium yellow, etc;
Organic Pigments: Organic pigments are divided into two categories: natural and synthetic. Nowadays, synthetic organic pigments are commonly used. Synthetic organic pigments can be divided into several categories such as monoazo, disazo, lake, phthalocyanine and fused ring pigments. The advantages of organic pigments are high tinting strength, bright color, complete color spectrum and low toxicity. The disadvantage is that the light resistance, heat resistance, weather resistance, solvent resistance and hiding power of the product are not as good as those of inorganic pigments.
Solvent Dyes: Solvent dyes are compounds that absorb, transmit (the dyes are all transparent) certain wavelengths of light and do not reflect others. According to its solubility in different solvents, it is mainly divided into two categories: one is alcohol-soluble dyes, and the other is oil-soluble dyes. Solvent dyes are characterized by high tinting strength, bright colors and strong luster. They are mainly used for the coloring of styrene and polyester polyether plastic products, and are generally not used for the coloring of polyolefin resins. The main varieties are as follows. Anthraaldehyde type solvent dyes: such as C.1. Solvent Yellow 52#, 147#, Solvent Red 111#, Disperse Red 60#, Solvent Violet 36#, Solvent Blue 45#, 97#; Heterocyclic solvent dyes: such as C .1. Solvent Orange 60#, Solvent Red 135#, Solvent Yellow 160:1, etc.
References
[1] Zhong Shuheng. Color Composition. Beijing: China Art Publishing House, 1994.
[2] Song Zhuoyi et al. Plastic raw materials and additives. Beijing: Science and Technology Literature Publishing House, 2006. [3] Wu Lifeng et al. Masterbatch User Manual. Beijing: Chemical Industry Press, 2011.
[4] Yu Wenjie et al. Plastic Additives and Formulation Design Technology. 3rd Edition. Beijing: Chemical Industry Press, 2010. [5] Wu Lifeng. Plastic Coloring Formulation Design. 2nd Edition. Beijing: Chemical Industry Press, 2009
Post time: Apr-15-2022