Different additives on the ink printing adaptability of each are not identical

According to expert introduction, additives is in order to improve the printing ink of various printing eligibility and add all kinds of auxiliary agent. Mainly include plasticizer, ultraviolet absorbent, desiccant, antioxidants, netting remover, etc. Usually only add a small amount of additives in printing, can make the printing eligibility greatly improved. Such as plasticizer was to make the ink film soft additives, has the very good effect on the volatile drying inks, but add too much can make resin softening, cause adhesion substrates. Plasticizer for reactive ink has no effect. With nitric acid fiber for links to material of screen printing ink often join phthalic acid dibutyl, oil-based ink, castor oil, water-soluble ink, glycerin, etc, can improve them in some printing surface imprinting fixation. In soft plastic screen printing, plasticizer used more universally. Should be paid attention to the choice of plasticizer and intermiscibility and durability of ink system, which in turn with volatile, migration resistance, light resistance, heat resistance and cold resistance performance. Uv absorber can absorb ultraviolet light, and improve the printing ink of climate resistance, especially for the outdoor use of weak light fastness of fluorescent ink, use will have a good effect.

The desiccant is a material designed to shorten the ink drying time. It is prompted the ink dry matter, also known as dry oil. For oxidation polymerization type printing ink, desiccant, with unsaturated double bond of the material can be speeded up conjunctival process. This kind of desiccant is more metal oxide, drier performance related to the metal type. Cobalt drier fastest dry oil, and its excellent dry; Manganese dry oil drier, lead drier the slowest drying oil. Ink slow drying agent can have the effect of dilution ink, and can adjust the drying speed of oil, prevent dry too fast, ink dry solid plugging. Different varieties of ink, ink of different origin, there are differences between the drying speed, in the hot summer, plugging the most serious, this time, slower than agents play an important role, especially in high precision, the design of fine lines, be sure to use slow dry agent or slow drying agent, to solve it in screen printing screen blocking, line of the problem. Slower than the agent of another role, adjust the ink dry after slow hair line edge tooth surface will decrease, and ink layer of surface flow is smooth, can reduce the occurrence of surface reticulate. In fact have played an important role in promoting the change agent. So slow drying agent and slow dry agent thinners, is widely used to do the high quality demand of screen printing products, slow dry winter are a large number of application agent to dilute ink.

Some screen printing ink table dry quickly, one to even can't screen printing, hot summer especially fine lines. This is the most headache problem printing workers. Surface dry too often appear the following several ways: fine line printing after a few times and finally "screen printing. Thick line image will be distorted. Dry too fast, easy to cause drawing, if the surface of the ink dry quickly, ink, thick, wiredrawing phenomenon is particularly serious, encounter this kind of situation, to join slow drying agent can effectively inhibit the drawing. Such as plastic screen printing ink, metal and glass printing ink, solder resist ink, ink characters and the corrosion resistant ink, etc. This needs dry agent: also called antioxidants, when some ink formula is drier performance strong pigment (iron, chrome yellow, blue, etc.) in the rolling with conjunctival phenomenon, make the ink rolling thin, hard in store because of the ink surface oxidation and crust is exposed to air and sometimes even become dry, can't use, can occur on the printer tend to dry solid crust, these problems are in the making of printing ink to consider problems as far as possible, so can be appropriately in the ink to join inhibitory filling material, such as AlOH, or reduce the dry material such as vaseline and wax, etc. But sometimes also cannot completely overcome these problems using these methods, then add the right amount of dry agent, to delay the oxidation polymerization of drying oil.

According to expert introduction, prevent dry agent was able to delay the oxidation polymerization of drying oil, as a result of these substances are strong reducing agent, such as hydroquinone, catechol, alpha naphthol, beta naphthol, etc., they can be oxidized priority, in order to delay the oxidation of the drying oil. They are easy to react with free radicals to generate stable compounds, so as to prevent the free radical chain reaction. At present the most commonly used as dry agent of phenol is 2, 6 -, butyl 2-4 - methyl phenol, commonly known as between the two, butyl hydroxy toluene, reason often called butylated hydroxytoluene, it is white or light yellow powder, commonly used dry remover is take its five copies, and no. 6 oil 95 under stirring, heating to 110 ~ 115 ℃ was dissolved. In addition to the above several dry prevention agent, also used in printing process for some material to prevent ink crust belongs to the volatile of clove oil, ethylene oxide, etc., of involatile phthalic acid dibutyl and butylene acid, etc. These materials after joined the ink, can prevent the oxidation of crust on the web page. Clove oil and phthalic acid dibutyl materials in ink and drying oil with 1% accurate, add too much ink drying too slow, it will affect printing.