Tiara Minerals
The Basic Composition Of Materials, Magnetic Ink Introduction
Magnetic ink ink the same basic structure and general, from pigments, binders, fillers and excipients composition.
Print Network HC Magnetic ink the same basic structure and general ink, from pigments, binders, fillers and excipients composition.
1, pigment
Pigments used in magnetic ink pigment is not common, but the strong magnetic material, processed through the magnetic field has the ability to retain magnetism. The main components of magnetic ink is magnetic paint, magnetic paint is the best iron black (Fe 3 O 4 ), And brown iron oxide (Fe 2 O 3 ). Most of these pigments is less than 1 m, needle crystal, so that the particle size and shape make them easy to arrange in a magnetic field uniform to be relatively high residual magnetism.
Magnetic ink pigments for strong magnetic materials mainly iron (Fe), cobalt (Co), Nickel (Ni) and other magnetic elements, with Fe-Mo and Fe-W alloy of high magnetic elements, as well as with the Mn- Al and Mn-Bi NiAs type crystal structure of such alloys. Most of magnetic ink pigment is ferrite. The so-called ferrite is generally used XO-Fe 2 O 3 That the inorganic compounds, of which X is divalent metal ion, according to the different types of X, there is manganese - ferrite, iron - ferrite, Cu - ferrite and so on.
Black iron oxide composition, in general, ferrous oxide content of about 18% to 26%, and iron oxide content of 74% to 82%. Synthetic black iron oxide has excellent resistance to permeability, chemical resistance (acid, alkaline), light, almost non-toxic, and dispersion between the good to excellent. Better heat resistance, only about about 177 , the oxidation of iron oxide black iron oxide red only. Black iron oxide particles consistency is better, after diluting it with a clean blue-gray hue. Black iron oxide reaction is usually, their particle shape is generally cubic or spherical.
2, connecting material
Ink fluidity, viscosity, dry, Print Adaptive materials are mainly determined by connectivity. Link material is composed of part of the fluid ink. The magnetic ink is also expected to ink a link to the quality of the basis for good or bad. Magnetic ink printing ink binders and binders generally similar to the choice of vegetable oil, animal oil, mineral oil, but more use of synthetic resin material as the magnetic ink of the link.
Basic chemical composition of vegetable oil fatty acid glyceride mixture, or triglyceride. All of the oil can be a variety of fatty acids and glycerol as reaction products. If the oil thin ground floor on the glass, after a certain time, this thin film will be due to the absorption of oxygen in the air and gradually thickens, flexible, and finally form a solid. This is the oil of the drying process. This process is shorter, the better the oil dry. Dry oil good or bad, depending on the structure of unsaturated fats double bond number and location of the situation. Iodine can be used to determine the degree of unsaturated fat. In general, the iodine value between 140 to 200 for the dry oil, between 100 to 140 semi-dry oil, less than 100 for non-dry oil. Can be seen, the more unsaturated double bond, then dry the better. Also said that the more unsaturated fatty acids were dry as possible.
Synthetic resin in the ink industry is widely applied, it links to various types of resin-based material, has become the main research content of the present. Of the resin determines the characteristics of binders. Pure linseed oil-based binders vegetable oil system, its main drawback is the relative molecular mass is small, so the ink is made in Offset printing Printing is easy to cause emulsification, leading to a series of weaknesses, the printing can not proceed smoothly, the printing is not effective. The resin-based binders in this regard is almost completely overcome the shortcomings, which greatly improves the printing quality.
Alkyd resin used in paste inks, you can consider using a resin plasticizer, because of its good adhesion and flexibility, it can also adjust the ink dry and solid? Time. In the oil-based ink used in alkyd resins, the general should take into account the reaction of it with paint, and the reaction of hard resin and its film properties. Different phthalate alkyd resin wettability is more significant. Alkyd resins to create a hard link with the preparation of ink material, the pigment should be added to the selected note, if over-absorption of low molecular weight pigment material links, the links should pay attention to the hard resin and alkyd resin compound of balance.
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