Printing inks are often divided into high viscosity paste inks and low viscosity liquid inks according to their viscosity values. The most common paste inks are offset printing inks and screen printing inks. The viscosity of inks such as gravure ink, flexographic ink and news ink is very low, so these printing inks are also called liquid inks. In the drying method of low-viscosity ink (liquid ink), drying the ink through a cross-linking reaction is a method of drying the ink. At present, more and more UV light curing inks and EB curing inks (electron beam curing) used in the printing industry belong to the category of crosslinking reaction fixation. Among the components of the crosslinking reaction fixing ink, the crosslinking agent in the binder is one of the key components. The choice of crosslinking agent affects the drying speed of the ink film after ink printing; in addition, the crosslinking agent will also affect the viscosity of the ink system itself and the adhesion performance of the ink on the surface of the substrate after printing; second, the crosslinking agent It also affects the various resistances of the ink film layer on the surface of the printed matter, such as the heat resistance, light resistance, water resistance and solvent resistance of the printed matter surface. In summary, the cross-linking agent is an important component of the printing ink and varnish formulation ingredients used to improve the performance of the ink and improve the printability of the ink. When selecting the cross-linking agent for ink and glazing oil, it must be carefully selected to give the ink or glazing coating distinctive characteristics. Next, briefly introduce some of the cross-linking agents used more in ink systems and varnishes: 1. Oxidative cross-linking agent Tracing back the cross-linking agent used in printing inks, unsaturated oils may be regarded as veterans in the ink system. Unsaturated oils undergo a cross-linking reaction through oxygen to achieve drying and fixing of the ink or varnish. Oxidative cross-linking agents are usually used in sheet-fed offset printing inks and grease-based inks, but not in liquid inks. However, oxidized crosslinkers can also be used in liquid inks, and they can impart unique properties to the ink. Good alkali resistance is the most prominent advantage of this crosslinker. This advantage is very useful in some printing, for example, the packaging printing paper of soap needs the surface of the printed matter to have strong alkali resistance, at this time, the oxidizing cross-linking agent can play a role. Oxidizable alkyd and epoxy resin can meet some special applications in some printing. The oxidation-based crosslinking agent may be used with a catalyst that promotes the oxidation reaction when used, or it may not be added. Oxidized cross-linking agents can give ink products superior adhesion and resistance. 2. Zinc ammonium carbonate and zirconium ammonium carbonate Inorganic cross-linking agents such as ammonium zinc carbonate and ammonium zirconium carbonate react with resin and carboxyl groups to produce zinc ion bonds or zirconium ion bonds. These ion bonds have strong heat resistance and strong alcohol resistance. Ammonium zinc carbonate and ammonium zirconium carbonate are generally used in water-based inks. The PH value of the ink formulation system is usually 9 or higher. If the PH value is lower than 9, the chemical properties of the ink system will become unstable. 3. Silane Silane is an accelerator that improves ink viscosity, more specifically alkoxysilane. Silane can be added to solvent-based inks or water-based inks, and they can react with the carboxyl groups of the resin. The chemical reaction time will be slightly longer. In addition, silane-added inks require higher drying temperatures after printing. Silane has good viscosity performance and resistance performance, these properties are well reflected in ink products. 4. Organic titanate and organic zirconate Organic titanate and organic zirconate are another crosslinking agent of ink system. Many common ink resins often use organic titanate and organic zirconate as accelerators for ink viscosity. For example, nitrocellulose resin and polyurethane resin all use organic titanate and organic zirconate to improve ink adhesion. The chemical properties of organic titanate and organic zirconate are very lively, so it should be carefully formulated in the ink formulation to ensure the stability of the ink system. Organic titanates and organic zirconates have been used in solvent-based inks for many years, and organic titanates can also be seen in some water-based acrylic ink formulations. 5. Photoinitiator The photoinitiators used in UV inks and UV varnishes are special crosslinkers. The curing principle of UV ink and UV varnish is: First, the photoinitiator (crosslinking agent) absorbs the ultraviolet light emitted by the UV light device to generate reactive radicals, which can polymerize and crosslink the UV monomer Instead, a polymer film layer is formed. After the ink is dried, the ink film layer gives the printed matter good gloss and resistance. There are two main types of photoinitiators in current UV inks and UV varnishes: free radical photoinitiators and cationic photoinitiators, which have been used in some UV photocurable ink systems for many years. Since the photoinitiator determines the drying speed of UV ink or varnish, the choice of photoinitiator is a key part in the formulation of UV ink or varnish. The above mentioned cross-linking agents have their own advantages and disadvantages. No crosslinking agent is perfect. The cross-linking agent also needs to be used in conjunction with various other additives to make the ink meet the printing requirements. Because many cross-linking agents are toxic and smelly, they obviously cannot be used in food and pharmaceutical packaging and printing. Therefore, it is necessary to select ink cross-linking agents carefully and scientifically to meet the requirements of printing customers.
Just one magic in colour box or in opp bag. But it perform way will over one tricks. This one magic can be perform with other magic set or Single Magic.
This tricks have long history and popular acceptable by people all over the world. Now here, we provide different MAGIC tricks for you, such as magic dice, card magic, sponge magic and escaping magics, etc. To some extent, magic tricks is easy to learn and perform, also props are convenience to take with your own. We believe it is worth for you to pay time on this item. Dice Tricks are made of ABS material, this material is stable and safe, environment protection.
Magic Master is the perfect set for the aspiring magician. It is fun for your child and educational. Children who practice the performing art of magic have been able to improve their self-esteem, hand and eye coordination, reading comprehension, public speaking, communication, critical thinking and school grades.
More easy-to-learn tricks and high quality props. This set will teach children to perform the same tricks as magic wand, paper to coin, colorful barrel and many more
With a guidebook kids can be little magicians within 30 minutes.
Recommended for children 4 years of age and older
Single Magic Trick,One Magic Trick,Single Magic,Magic Mummy Tricks Zhejiang Kaseng educational toys Co., ltd , http://www.dasengmagic.com