Temperature change powder is used as anti-counterfeiting ink. Temperature-changing powder synthetic resin is widely used in the ink industry.

Thermoplastic powder synthetic resin is widely used in the ink industry

The basic chemical composition of the thermostable vegetable oil is a mixture of glycerides of fatty acids, a thermotropic powder or a triglyceride. All fats can be seen as a product of the reaction of various fatty acids with glycerol. If the grease is applied thinly on the glass, after a certain period of time, the thin oil film will gradually thicken and become elastic due to absorption of oxygen in the air, and finally form a solid state. This is the drying process of the grease. The shorter the process, the better the dryness of the oil. The dryness of the grease depends mainly on the number and position of unsaturated double bonds in the structure of the grease. The iodine value can be used to determine the degree of unsaturation of the oil. Generally, the iodine value is between 140-200 as a dry oil, between 100-140 is a semi-drying oil, and below 100 is a non-drying oil. It can be seen that the more unsaturated double bonds, the better the dryness. In other words, the more unsaturated fatty acids, the better the dryness.

The ink or ink used for the stamping of the temperature-changing powder ink is also an ink, and the anti-counterfeiting method can be modeled as described above. At present, research is being conducted to make new anti-counterfeit inks or inks using invisible fluorescent compounds such as ultraviolet rays, infrared rays, and X-rays, photoelectric conversion materials, special chemical substances, animal or plant DNA, monoclonal antibodies, and specific antigens. It is more difficult to copy. The printed matter stamped with this ink has the same appearance as ordinary printed characters, but shows special effects when detected by the corresponding method. If the ink is used to illuminate the seal printed with the anti-counterfeit ink, it can show bright fluorescence under ultraviolet light.

Temperature change powder ink temperature change ink is also called thermochromic ink, heat sensitive ink or temperature indicating ink. The temperature-changing inks are divided into four categories: a certain color is displayed at normal temperature, and the color disappears to be colorless after heating, and immediately returns to the original color after cooling, because the change process is reversible, which is called "reversible temperature change" Color ink"; display colorless at normal temperature, become another color after heating, and return to the original colorless after cooling, because its change process is reversible, called "reversible temperature change color ink"; ink Display color at normal temperature, change to another color after heating, because the change process can be reversed as "reversible temperature change color ink"; after heating, change from colorless or from a specific color to another color The color displayed after heating will not disappear, so it is called "irreversible thermochromic ink".

The color change temperature usually referred to is 34-100 degrees Celsius. The temperature-changing powder hand-color-changing ink is a kind of thermochromic ink, and refers to an ink which can undergo a color-changing effect under the action of a temperature of 34-36 degrees Celsius. The principle of thermochromism is to cause a change in the absorbance of the color changing compound by physical or chemical changes under heating.

Thermoplastic powder synthetic resin is widely used in the ink industry, so various types of resin-type binders have become the main research content at present. The properties of the resin determine the properties of the binder. The main disadvantage of the vegetable oil type binder made of pure linseed oil is that the relative molecular mass is small, so the ink produced is easy to cause emulsification in offset printing, which brings a series of defects, so that the printing can not be carried out smoothly, and the printing effect is not good. . The resin type binder almost completely overcomes the defects in this aspect, thereby greatly improving the quality of printing.

     As is known to all, stamps are different from general goods or trademarks. They are both securities and art. The pattern color of stamp design artwork is immutable. Moreover, there is a lot of content between squares. Add space for text and graphics. If texts and patterns are added for anti-counterfeiting, the artistic effect of the overall design of the stamps will be destroyed. Therefore, stamp anti-counterfeiting has certain difficulties and limitations. The Stamp Printing Bureau develops yellow, magenta and cyan fluorescent encryption anti-counterfeiting inks for the business characteristics of printing more than 100 kinds of stamps each year using different printing processes. There are 5 varieties: yellow ink yellow light, yellow ink red light, The red ink glows yellow, the red ink glows red, and the blue ink glows green. The above five kinds of fluorescent inks all contain an encryption component, so these five kinds of anti-counterfeiting inks can have the effects of first-line anti-counterfeiting (mass identification) and second-line anti-counterfeiting (instrument detection for arbitration).

    The new anti-counterfeiting ink of temperature-changing powder has the following characteristics in technology: First, the principle of chemiluminescence is adopted to realize the uniqueness of detecting fluorescence. According to customer needs, the patented special fluorescent compound is used for unique fingerprint recognition. The only spectrally characterized ink achieves the goal of protecting the product from counterfeiting. Second, the stability of daylight discoloration and hand-temperature-changing fluorescent materials is very high, which overcomes the shortcomings of the existing anti-counterfeiting inks which are generally aging. Thirdly, it has the special purpose of locking the special anti-counterfeiting ink formula of commodity brand, that is, according to the needs of customers, it uses the only extremely strong and characterization of anti-counterfeiting ink products to achieve the purpose of protecting products. Fourth, the new anti-counterfeiting ink can print invisible or colored anti-counterfeit graphics directly on the coated paper, cardboard, plastic film and other materials used for packaging such as tobacco and alcohol.