Yuan lei's little knowledge | fillers commonly used in printing inks
Ink is a uniform mixture of colored bodies (such as pigments, dyes, etc.), binder, filling (filling) materials, additional materials, etc.; It can be printed and dried on the printed body; It is a paste-like adhesive with color and certain fluidity. Therefore, color (hue), body (thin thick, fluidity and other rheological properties) and drying properties are the three most important properties of ink. The ink color is by the "powder" in the role.
01 Color Body of Ink
The color body in the ink is mainly composed of pigments and dyes. For pigments, it has the following effects on the ink: 1. It can make the ink color, 2. It directly affects the fluidity of the ink, 3. The physical and chemical properties of the pigment play a decisive role in the resistance of the ink, 4. It has an impact on the chemical stability and drying. Ink commonly used pigments are: iron red, chrome yellow, iron blue, carbon black, azo pigments and titanium dioxide.
02 Ink link
The binder is one of the main components of the ink, which plays a role as a medium for dispersing pigments and auxiliary materials. It is made by dissolving a small amount of natural resin, synthetic resin, cellulose, rubber derivatives, etc. in drying oil or solvent. There is a certain degree of fluidity, so that the ink after printing to form a uniform thin layer, after drying to form a certain strength of the film, and the pigment protection, so that it is difficult to fall off.
The connecting material has a great influence on the printing adaptability and printing effect of the ink transfer, brightness, fixing speed, etc., therefore, the selection of the appropriate connecting material is one of the keys to ensure good printing, to be able to adjust the composition and ratio of the connecting material at any time according to the different packaging materials, printing requirements, etc.
03 Ink Filler
The filler is a transparent, translucent or opaque white powdery substance that is also a solid component of the ink. It plays the role of filling in the ink, mainly as a pigment filling material, used to reduce the amount of pigment, reduce the cost of ink, and at the same time can adjust the color of the ink, improve the printing suitability of the ink. The amount of filler in the ink is not large.
The filling materials commonly used in ink are: calcium carbonate, barium sulfate, aluminum hydroxide, calcined kaolin.
(1) Colloidal calcium carbonate
Colloidal calcium carbonate is a new type of filler, which is mainly characterized by fine particles and large surface area. Compared with natural calcium carbonate and light calcium carbonate, colloidal calcium carbonate has the advantages of large oil absorption, high transparency, good brightness and good stability, so it has been widely used in printing inks.
(2) Precipitated calcium carbonate
The ink uses ultrafine high quality precipitated calcium carbonate. The ink has good stability, fast drying and no side effects, good printability, small particles, and complete dots.
(3) Barium sulfate
Barium sulfate is also called barite. Soft, amorphous. Good chemical resistance, low hiding power, high density can adjust the flow properties of the ink to prevent dirty.
(4) Aluminum hydroxide
Aluminum hydroxide is a typical amphoteric compound, which is insoluble in water, but can be dissolved in acid and alkali solutions. Aluminum hydroxide has been widely used in oily ink, it not only plays the role of filler, but also a good thickener. Aluminum hydroxide has good dispersion and strong extension force, but also easy to cause the ink gel. At present, it has been gradually replaced by colloidal calcium carbonate.
(5) Calcined kaolin
Calcined kaolin with high whiteness, narrow particle size distribution, good optical properties, high hiding power, can partially replace titanium dioxide. Contains trace amounts of calcium magnesium potassium is mainly used for gravure printing.
Ink is not only used in packaging and printing industry modern home also use ink to decorate beautiful home.
Ink, printing, pigment, calcium carbonate, filling, linking, aluminum hydroxide, function, has
Kaolin is a non-metallic mineral, which is a kind of clay and clay rock mainly composed of kaolinite clay minerals. Because it is white and delicate, also known as white earth. It is named after Gaoling Village, Jingdezhen, Jiangxi Province.
Barium sulfate is based on barite as the main raw material, through beneficiation, ore washing, crushing and other processes. Barium sulfate has a hardness of 3~3.5 (Mohs) and a specific gravity of 4.3~4.7. It has the characteristics of high specific gravity, low hardness and brittleness. Barite is almost insoluble in water, ethanol and acid, soluble in hot concentrated sulfuric acid. With the development of some high-performance barium sulfate products, the application field of barium sulfate is constantly expanding.