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Plasticizer
Plasticizers are additives that make the ink film soft and have a good effect on the volatile drying ink. However, excessive addition of the plasticizer will soften the resin and cause the substrate to stick. Plasticizers have no effect on reactive inks. The use of nitrocellulose as a binder in screen printing inks often includes adding dibutyl phthalate, oil-based inks with castor oil, water-soluble inks with glycerin, and the like, both of which can improve the fixation of certain printing surfaces. . Plasticizers are more commonly used in soft plastic screen printing. The choice of plasticizer should pay attention to the compatibility and durability of the ink system, which in turn is related to its volatile, anti-migration, light resistance, heat resistance, and cold resistance properties.
2. UV absorbers
UV absorbers absorb UV light and improve the weather resistance of the ink. In particular, the use of fluorescent inks with poor lightfastness in outdoor use will have a very good effect when used.
3. Desiccant
Desiccants are substances that are specifically designed to shorten the drying time of inks. It is a substance that promotes ink drying, also known as dry oil. For oxidative polymerization inks, the addition of a desiccant accelerates the conjunctival process of substances with unsaturated double bonds. Most of these desiccants are metal oxides, and the drying performance is related to the type of metal. Cobalt-dried oil dries fastest, and is dried by the surface and the inside; manganese dry oil dries normally, and lead-dried oil dries the slowest.
Ink slow-drying agent, it can not only play a role in diluting the ink, but also can adjust the drying speed of the oil, prevent drying too fast, and ink dry-blocking network. Different types of inks, inks from different origins, have different drying speeds. In the hot summer, the most severe network is blocked. During this time, slower agents play an important role, especially the patterns with high precision and fine lines must be used. Slow-drying agent or special slow-drying agent can solve the problem of screen blocking and line thinning in screen printing. Slower than the agent's other role, adjust the ink surface slower dry speed after the line edge hair teeth will be reduced, the ink layer smooth surface, can reduce the appearance of surface texture. Actually played the role of a promoter. Therefore, slow-drying agents and special slow-drying agents are widely used for making thinner materials. For products requiring high screen printing quality, a large number of slow-drying agents are used in the winter to dilute the ink.
While some screen printing inks are extremely quick to dry, they can't even print on hot summer days, especially thin lines. This is the biggest headache for silk screen workers. The surface is too fast, often the following situations occur:
Fine lines print after a few thinning, and finally the screen printing can not go. Thick lines also become distorted. Drying too quickly can easily lead to wire drawing. If the ink surface is dry quickly and the ink is thick, the drawing phenomenon is particularly serious. In this case, adding a special slow drying agent can effectively inhibit the occurrence of wire drawing. Such as plastic screen printing inks, metal and glass inks, solder mask inks, character inks and self-drying corrosion-resistant inks.
4. Anti-drying agent
Anti-drying agents are also called antioxidants. When the ink formulation adopts some pigments with strong driers (iron blue, chrome yellow, etc.), there is a phenomenon of conjunctiva during rolling, which makes it difficult for the ink to be finely rolled. During storage, oxidation occurs due to the contact of the ink surface with air and the skin is crusted. Sometimes, even when it becomes dry, it can not be used. It also tends to dry on the printing press. These problems are considered as much as possible in the manufacture of inks, so inhibitory fillers such as AlOH can be properly added to the ink. Or reduce dry materials such as petrolatum, wax, etc. However, sometimes these methods cannot completely overcome these problems. In this case, appropriate anti-drying agents can be added to delay the oxidative polymerization of dry oils.
Antidrying agents can delay the oxidative polymerization of drying oil because these substances are all strong reducing agents such as hydroquinone, catechol, α-naphthol, β-naphthol, etc., which can be preferentially Oxidation delays the oxidation of dry oils. They react easily with free radicals to form stable compounds, which prevents the free radical chain growth reactions.
At present, as the anti-drying agent, the most commonly used phenol is 2,6-di-tert-butyl-4-methylphenol, commonly known as di-tert-butyl hydroxy toluene, it is often called BHT, it is white or yellowish powder, commonly used The anti-drying agent is prepared by taking 5 parts of it and stirring it with 95 parts of No. 6 oil under constant stirring and heating to 110-115°C.
In addition to the above-mentioned several anti-drying agents, some materials that can prevent the crust of the ink are also used in the printing process. They are volatile and contain clove oil, ethylene oxide, etc. They are non-volatile and have dibutyl phthalate. Ester and maleic acid and so on. After these materials are added to the ink, oxidized crusts can be prevented on the screen surface. The materials such as clove oil and dibutyl phthalate are added to the ink and drying oil at the rate of 1%, and if too much is added, the ink is dried too slowly, which will affect the printing process.
Soft bag chair is a sponge, cloth or soft leather bag named. There are two common all soft bag chairs and semi-soft bag chairs on the market. The so-called package is a totally flexible backrest and cushion are sponges, then Gapi material or soft bag made of cloth. The semi-soft bag chairs generally only cushion soft case. From the fabric, the leather chairs and fabric soft pack soft bag chairs face the choice of different, with skin, Busha choice is the same, in the end is good or better choose leather sofa fabric sofa, in fact, each has its own characteristics, The most important thing according to their own style of decoration and customer preferences.
Soft bag chairs are made of high quality wood frame inside the building, solid structure, angle in accordance with ergonomic design, better use of improved function and quality of the chair. Soft pack part made of high quality sponge, cotton high density multi-layer structure, ride comfort, spring rate, and durability.
Improvement Analysis of Additives to Printability of Ink
The auxiliaries are various auxiliaries that are added in order to improve various printability of the ink. Mainly plasticizers, UV absorbers, desiccants, antioxidants, anti-neting agents. In the printing, usually only a small amount of additives are added, so that the printability can be greatly improved.