Can waxes improve the heat resistance of inks? With the adoption of various new materials and the development of packaging and printing technologies, the performance requirements for inks are getting higher and higher, in order to ensure that the printed products have good abrasion resistance, scratch resistance and slip resistance. At this time, it is necessary to use What is the specific role of wax in ink?
In order to effectively improve these properties of ink, it is usually achieved by incorporating a certain amount of wax into the ink. However, due to the high melting point of wax, it is relatively difficult to directly incorporate into the ink, and the most worrying problem is the dispersion of wax powder.
Types of waxes: waxes can be divided into four types: oil waxes, mineral waxes, synthetic waxes and natural waxes according to their sources. Among these four kinds of waxes, their main components are saturated hydrocarbons or waxes. Waxes are non-toxic and non-toxic. It has excellent water resistance and water vapor permeability resistance, so it is widely used in the field of waterproof and food packaging.
1. The chemical properties of wax are relatively stable, and are not attacked by acids and alkalis. Grease wax is mixed with wax in printing inks and is mainly used to reduce the viscosity of letterpress and lithographic inks. They are also used as stabilizers to reduce the drying time of letterpress inks on printing cylinders.
2. Synthetic wax Polyene wax is usually obtained by polyaddition of ethylene. Synthetic waxes are waxy white solids. It can be incorporated into all printing inks and coatings to improve their rub resistance and slip resistance.
3. Mineral wax montan wax Mineral wax is mainly extracted from minerals such as bitumen, lignite or rock. For example, the wax extracted from lignite is called coal wax. Montan waxes and other mineral waxes are widely used in printing inks.
4. Natural wax Natural wax is a mixture of alkanes, fatty acids and esters. There are two main types of natural waxes: beeswax and palmitate wax. Carnauba wax, added to the ink, does not float to the surface after printing, so carnauba wax is widely used in overcoat varnishes, glossy inks and gold ink binders.
As an additive to improve the performance of ink, wax is different for different purposes of ink, its mixing method, the amount of adding, ink usage method and problems that should be paid attention to are different. Incorporation of wax in oil-based ink Adding wax into oil-based ink requires that the wax must enter the surface of the ink film after printing to improve the slipperiness and friction resistance of the ink. But the wax cannot be added directly, because the wax is very insoluble in the ink at room temperature, so a special process is required, and the wax emulsion can completely solve the problem of dissolution and dispersion.
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