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.
Metallic pigments: Metallic pigment silver powder is actually aluminum powder, which is divided into two categories: silver powder and silver paste. Silver powder can reflect blue light and has blue phase color light. In color matching, pay attention to the particle size and see the size of silver powder in the color sample. Thickness, whether it is a combination of thickness and thickness, and then estimate the quantity. Gold powder is copper-zinc alloy powder. Copper is mostly red gold powder, and zinc is mostly turquoise powder. The coloring effect varies depending on the thickness of the particles.
Pearlescent pigments: Pearlescent pigments are made of mica as the base material, and one or more layers of high refractive index metal oxide transparent films are coated on the mica surface. Generally, a titanium dioxide layer is coated on a mica titanium wafer. There are mainly silver-white series, pearl-gold series, and Symphony pearl series. Pearlescent pigments have the characteristics of light resistance, high temperature resistance, acid and alkali resistance, no fading, no migration, easy dispersion, safety and non-toxicity, and are widely used in plastic products, especially high-end cosmetic packaging and other products.
Symphony pearlescent pigments: Symphony pearlescent pigments are colored pearlescent pigments with different interference hues obtained by adjusting the thickness and level of the coated surface during the production process of mica titanium pearlescent pigments, which can show different colors at different angles of the observer. , known in the industry as phantom or iridescence. The main varieties are as follows. Red pearl: front red purple, side yellow; blue pearl: front blue, side orange; pearl gold: front golden yellow, side lavender; green pearl: front green, side red; purple pearl: front lavender, side green ; White pearl: yellow-white on the front, lavender on the side; copper pearl: red and copper on the front, green on the side. Products produced by different manufacturers will have different interference hues. In color matching, it is necessary to be familiar with the changes and thicknesses of the front and the side of various interference pigments, in order to master the color matching skills of magic pearl.
Fluorescent Pigment: Fluorescent pigment is a kind of pigment that not only reflects the light of the color of the pigment itself, but also reflects part of the fluorescence. It has high brightness, and has a higher reflected light intensity than ordinary pigments and dyes, which is bright and eye-catching. Fluorescent pigments are mainly divided into inorganic fluorescent pigments and organic fluorescent pigments. Inorganic fluorescent pigments such as zinc, calcium and other sulfides can absorb the energy of visible light such as sunlight after special treatment, store it, and release it again in the dark. In addition to absorbing part of visible light, organic fluorescent pigments also absorb part of ultraviolet light, and convert it into visible light of a certain wavelength and release it. Commonly used fluorescent pigments are fluorescent yellow, fluorescent lemon yellow, fluorescent pink, fluorescent orange red, fluorescent orange yellow, fluorescent bright red, fluorescent purple red, etc. When choosing toners, pay attention to their heat resistance.
Whitening agent: Fluorescent whitening agent is a colorless or light-colored organic compound, which can absorb ultraviolet light invisible to the naked eye and reflect blue-violet light, thereby making up for the blue light absorbed by the substrate itself to achieve the whitening effect. In plastic toning, the addition amount is generally 0.005%~0.02%, which is different in specific plastic categories. If the addition amount is too large, after the whitening agent is saturated in the plastic, its whitening effect will decrease instead. At the same time the cost increases.
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