1 Fluorescent ink: Fluorescent ink is made of fluorescent material dissolved in the corresponding resin. The particles of fluorescent pigments are generally thicker, the types of bonding materials are more, different bonding materials will produce different fluorescence, in the use of fluorescent ink should ensure that it has sufficient concentration, the ink layer on the printing product is thicker, so as to ensure satisfactory fluorescence effect. Fluorescent ink after screen printing printing bright color, decoration effect is very good, under the action of visible light and ultraviolet light, can emit sparkling fluorescence. 2 Photochromic ink: UV ink photoinitiator is a compound that is easily excited by light, excited into free radicals after absorbing light, and the energy is transferred to photosensitive molecules or photocrosslinking agents, so that UV ink photocuring reaction occurs. UV ink has become a more mature ink technology, and its pollutant emissions are almost zero. In addition to solvent free, UV ink also has such advantages as not easy to paste, clear dot, bright ink color, excellent chemical resistance, consumption and so on. 3 Light storage and phosphorescent ink: Light storage pigment is the use of inorganic fluorescent material with phosphorescent effect of some zinc sulfide. Copper fluorescence, calcium sulfide. Prepared from bismuth fluorescence, etc. Inorganic fluorescent matter is by crystal light, if the pressure will make the crystal rupture, resulting in reduced luminosity, so the general use of screen printing is more suitable, ink carrier and fluorescent matter in use mixed. The characteristic of phosphorescent ink is to absorb light and then emit light at a certain wavelength within a certain time. The pigment of this ink is zinc sulfide containing a small amount of impurity (such as zinc cadmium sulfide), it is afraid of acid, afraid of alkali, so it requires the use of neutral resins such as cyclohexanone resin, fiber ester and ether. In addition, heavy metals, desiccant and drying oil should not be added to the ink to avoid damaging the pigment substance. The binding material used should be transparent and be able to penetrate ultraviolet light. This ink is mainly used for printing advertising and signs, but if phosphorescent ink and fluorescent ink are mixed for anti-counterfeiting packaging printing, you can receive good packaging decoration and anti-counterfeiting effect. 4 Special printing ink: Printing ink is mainly composed of colors, fillers, linking materials, etc., of which the composition of the color is an important part of determining the color and brightness of the printing, many manufacturers and ink factories customize the special ink for each product printing, and the formula is kept secret by the ink factory. 5 Compound ink: After two or more kinds of anti-counterfeiting inks are mixed according to a certain proportion, composite inks with new properties can be developed, and it will be diffi...

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Advantages and disadvantages of the same type of defoamer Organic defoamer such as mineral oils, amides, low alcohols, fatty acids, fatty acid esters and phosphate esters has been studied and applied earlier, belonging to the first generation of defoamer, which has the advantages of easy access to raw materials, high environmental performance and low production cost.The disadvantages are low defoaming efficiency, strong specificity and harsh use conditions. Polyether defoamer is the second generation of defoamer, which mainly includes straight chain polyether, polyether with alcohol or ammonia as the starting agent and polyether derivatives with end group esterification.The biggest advantage of polyether defoamer is its strong anti-foam ability. In addition, some polyether defoamer has excellent properties such as high temperature resistance, strong acid and alkali resistance.The disadvantages are that the use conditions are limited by temperature, the use field is narrow, the defoaming ability is poor, and the bubble breaking rate is low. Silicone defoamer (the third generation of defoamer) has the advantages of strong defoamer performance, rapid defoamer ability, low volatility, no toxicity to the environment, no physiological inertia, wide range of use, etc., so it has broad application prospects and huge market potential, but the foam suppression performance is poor. Polyether modified polysiloxane defoamer has the advantages of polyether defoamer and silicone defoamer at the same time, which is the development direction of defoamer.Sometimes it can also be reused according to its reverse solubility, but at present, there are fewer types of such defoamer, which is still in the research and development stage, and the production cost is high. Selection of defoamer The selection of defoamer should meet the following points: 1.Insoluble or insoluble in the foaming liquid In order to burst the foam, the defoamer should be concentrated and concentrated on the bubble film. For the case of defoaming agent, it should be concentrated and concentrated in an instant, and for the case of defoaming agent, it should always be maintained in this state. Therefore, the defoamer is supersaturated in the foaming solution, and only insoluble or insoluble is easy to achieve supersaturation. Insoluble or insoluble, it is easy to gather at the gas-liquid interface, it is easy to concentrate on the bubble film, and it can play a role at a lower concentration. For the defoamer used in water systems, the molecules of the active ingredients must be strong hydrophobic and weak hydrophilic, and the HLB value should be in the range of 1.5-3 for the best effect. 2. The surface tension is lower than the foaming liquid Only when the intermolecular force of the defoamer is small and the surface tension is lower than that of the foaming solution, the defoamer particles can be immersed and expanded on the foam film. It is worth noting that the surface tension of the foaming solu...

The foam problem in water treatment has troubled many people, debuting the initial foam, surfactant foam, impact foam, peroxide foam, circulating water treatment with non-oxidizing fungicide generated foam, etc., so the use of defoamer in water treatment is more common, this article comprehensively introduces the principle, classification, selection and dosage of defoamer! Methods of foam elimination 1.Physical methods From a physical point of view, the methods to eliminate foam mainly include the placement of baffles or filters, mechanical agitation, static electricity, freezing, heating, steam, radiation irradiation, high-speed centrifugation, pressure and pressure reduction, high-frequency vibration, instantaneous discharge and ultrasonic (acoustic liquid control), etc. All these methods promote the gas transmission rate at both ends of the liquid film and the liquid discharge of the bubble film to different degrees. The stability factor of the foam is less than the attenuation factor, and the number of bubbles is gradually reduced. However, the common disadvantage of these methods is that the use of environmental factors is strong, the defoaming rate is not high, and the advantages are environmental protection and high reuse rate. 2.Chemical methods The methods of removing foam from the chemical point of view mainly include chemical reaction method and the method of adding defoamer. The chemical reaction method refers to the chemical reaction between the foaming agent and the foaming agent by adding some reagents to produce a substance that is insoluble in water, thereby reducing the concentration of surfactant in the liquid film and promoting the rupture of the foam, but this method has shortcomings such as the uncertainty of the composition of the foaming agent and the harm to the system equipment caused by insoluble substances. Nowadays, the most widely used defoaming method in all walks of life is the method of adding defoaming agent. The biggest advantage of this method is that it has high defoaming efficiency and easy to use, but finding a suitable and efficient defoaming agent is the key. Principles of defoamer Defoamer, also known as defoamer, has the following principles: 1. The local surface tension of the foam is reduced, resulting in the collapse of the foam The origin of this mechanism is that high alcohols or vegetable oils are sprinkled on the foam, and when they dissolve into the foam solution, the surface tension there is significantly reduced. Because these substances are generally less soluble to water, the reduction in surface tension is limited to local areas of the foam, while the surface tension around the foam hardly changes. The portion with reduced surface tension is strongly pulled around, extended, and finally ruptured. 2.Damage the membrane elasticity and cause the bubble to burst When the defoamer is added to the foam system, it diffuses to the gas-liquid interface, which makes it difficult for the surfactant wit...