Discuss the application of natural ink anti-friction agent

First, ink printing how much fun

When packaging and printing technology pursues the environmental protection effect, people will debut water-soluble ink products. Its greatest characteristics are: (1) no pollution to the environment; (2) wide source of materials; (3) low-cost, recognized green products. However, after people practice for a long time, due to the limitations of the technology, they often encounter: 1 difficulty in color registration; 2 poor gloss; 3 warped edge; 4 water immersion; 5 non-abrasive rubbing; 6 pairs of metal such as aluminum foil and The adhesion fastness of polyolefin films is not good enough, and the scope of application of printing inks is questioned. This age-old problem has seriously plagued the promotion and application of this product and has directly affected the progress of ink theoretical knowledge. After analyzing and researching through modern ink printing technology, it is proved that the occurrence of these special faults is related to the large surface tension of the ink. In order to overcome the above problems, after scrutiny for nearly twenty years, the author summarized the mechanism of the penetration of the aqueous ink film forming process and the mechanism of the natural ink anti-friction agent that resists the osmotic pressure so as to discuss with the ink and printing industry colleagues.

Second, the role of ink anti-friction agent

1. Anti-friction agent materials The raw materials of this product are first physically adopted, filtered, concentrated, separated and precipitated—to be recrystallized and refined from crude products, and chemical and alkali metal and alkaline earth metal sulfates and sodium carbonate are chemically removed. Impurities are made of sodium compounds - raw materials for anti-friction agents.

Considering that almost everywhere can be purchased in nature, especially in the packaging printing products to prevent the penetration of graphic ink film printing ink, control and reduce the surface tension and the amount of the link material in the ink system, the author went through Hubei, After repetitive comparisons with packaging and printing companies in Hunan, Guangdong, Fujian, Zhejiang, Shanghai, Jiangsu, Shandong, Liaoning, and Henan, the re-dissolved neutral anti-friction agent is still a natural inorganic substance without any toxic side effects. of. It not only can greatly improve the luster and anti-friction property of ink film in packaging and printing, but also is one of the most simple, low-cost and human-needed elements in the world.

2. The mechanism of action of the abrasion resistance agent The excellent packaging printing ink graphic ink film, not only has the above conditions, but also should add the PH buffer solution in the ink system, its purpose is: under certain conditions can resist external acid or Alkaline interference, but will not be due to the addition of a small amount of acid or alkali and change the pH value of the ink additives to maintain the stability of the ink liquid pH in a certain range. In particular, when the linking material is added to the linear structure of the ink system, the ink can be cross-linked to form a bridging effect between the linear molecules, so that a plurality of linear molecules are bonded to each other to form a network. The most cost-effective water-based ink auxiliaries of the structure, most notably the degree of branching, are greatly increased by several times or even several tens of times, and the range of packaging printing products is expanded and the cost is reduced.

We know that the instability of the printing ink ink film is mainly caused by the imbalance of ink osmotic pressure. The main component that can generally maintain ink balance is a neutral cross-linking agent. A lack of cross-linking to maintain the stability of the surface of the ink is a large amount of ink and rough surface of the substrate, can cause ink in the ink system will link the material in the resin into the substrate and lead to poor printing film ink film gloss, not Resistance to rub and so on. When we have a molecular weight of more than 106, a relative density of 2.1/25°C or more, a melting point near 800°C, and a boiling point that is unbelievable, it is conceivable from such phenomena as water, glycerol, and alcohol: Cross-linking auxiliaries can not only improve the swelling and gelation of the ink during production or use of the ink, but also improve the heat resistance of the packaging printing ink. No matter whether it is in the high temperature production or in the complex environment of low temperature operation, bubbles will not occur due to the addition of this product, causing pinholes and releasing gas, and it will not be caused by the residue of the additive in the graphic ink film. Text migration, discoloration, and fading.

The author learned in a large number of experiments: When the high temperature exceeds 300 ° C easy to decompose and release oxygen. This oxidizing property, such as carbon, sulfur, phosphorus, and organic matter, etc., causes a violent explosion after mixing and colliding, but the oxidizing property of the liquid as an anti-friction agent that is re-dissolved and formed is much weaker than that of solids. The requirement for packaging printed products exceeding 300°C has not yet appeared.

3. The principle of the formation of printing ink film We carefully review the packaging printing experience of 2000 years. Although the printing methods are different, the formation of graphic ink film is also all sorts of colors, but the basic basic theory is: after printing, the printing ink on the substrate is fixed at the position of the printed position, and the scientific and technological circles are often called physics. Adsorption and chemical adsorption are two major categories. That is, physical adsorption mainly attracts each other by the intermolecular forces of the ink and the substrate, and the endothermic absorption is generally small; while chemical adsorption attracts each other with a force similar to that of a chemical bond, and generally the heat absorption is large. As a liquid or solid ink surface adsorption of gas or solute phenomenon, in our daily packaging and printing, because the ink adsorption force is often greater than the substrate, so the substrate has been adsorbed ink is not easy to release - that is, powdering , pinholes, missing blocks, infiltration, etc., otherwise it is the other way around. This is because the hydrogen bonds of the packaging printing inks have already undergone chemical changes on the substrates and no longer have the original properties (states). Therefore, when aqueous ink anti-friction agents are added, they are mostly irreversible.

Why the packaging printing ink system can only pass through the dispersing medium - water (solvent) and ammoniated resin molecule / colloidal solution (professional linking material) on the printed substrate, but cannot pass the pigment (colorant) and filling Feeding molecules so that the molecules of the dispersion medium are separated from the colorant molecules? Because the dispersion medium spreads out through the substrate as soon as it is printed. This phenomenon is called penetration of packaging printing ink. Strictly speaking, the infiltration is mostly dispersion medium, and the dispersion medium is mostly solvent. When two different concentrations (solvents of different solubilities in the ink system and different resins) binders are dispersed with different disperse fine particle colorants and the ink dispersion formed in the media is separated from the substrate The solvent in the lower concentration of the binder solution can also infiltrate into the higher concentration solvent, and most of the pigments and fillers remaining on the surface of the substrate are often referred to as suspensions due to the binder in the dispersion medium ( Here only refers to the resin component is small or unstable, it is very easy to be washed away by water or other solvents or rubbed away.

The above failure occurs (permeate) and results in the loss of gloss of the graphic ink film. The use of natural ink anti-friction agent can make up for the defects of the ink film forming (ink penetration, floating color, poor gloss, water resistance, Alice curling angle, color brightness, low chroma, poor print flatness and difficult to print more than one version Color high-speed overprinting, manual jamming and programmed cutting, and mechanized labeling with low authenticity, etc.) Use the advantages of ink anti-friction agent to promote the balance between solvents (water, alcohols), resins, pigments, fillers and substrates in the ink system. This is said to exert extra pressure to realize the dream of the world's dreams for nearly forty years.

Academics place extra pressure in X letters. The amount of ink anti-friction agent added determines the size of the infiltration pressure and the concentration and temperature of the binder in the packaging printing ink system (including the substrate pH, temperature, flatness, moisture content) and the ambient temperature of the printing shop. ,humidity. An ideal water-soluble printing ink binder has the following relationship:

Where XA' is the mole fraction of solvent (water, alcohol, etc.) in the higher concentration ink vehicle, and XA is the mole fraction of solvent (water, alcohol, etc.) in the lower concentration of ink vehicle. A is the molar volume of the solvent. If the low concentration of ink binder is replaced with pure solvent, then XA=l, so the above formula can be:

In addition to the general consensus on the mechanism of action of the ink anti-friction agent, the control of the pH value, the insufficient content of the resin in the ink ink film system, or the unscientificness of the link material in the ammoniation reaction result in the occurrence of the above failure. Although the above failures are attributed to poor ink compatibility and instability, a comprehensive view of ink-jet brands in the domestic and foreign markets and reading of various packaging and printing presses shows that an ink-based ink anti-friction agent that can become a major commodity has yet to be printed. , packaging and printing industry and commodity packaging customers and consumers to improve. That is, the material source is sufficient, the purchase price is low, and the handling troubles are simple and easy to use, and they are immediately available for immediate use. As for whether the above-mentioned principle of eliminating print failures proposed by the author can be used to formulate formulas and expand the scope of application—it is no longer necessary to explore hard to influence the normal marketing of packaging and printing, and it is still necessary to achieve consensus as a whole to be more green. The actual meaning of type ink.

In the face of different ink brands researched and developed by different regions and different manufacturers in different countries today, we scientifically design and produce a brand new environment-friendly water-soluble packaging printing ink product to help packaging printing companies, especially packaging printing companies, in China and even the world. Preventing the occurrence of the above-mentioned failures also helps to inhibit the production and operation of packaging and printing products from the inferiority of the ink, such as foam, pinholes, white spots, shrinkage holes, curled edges, infiltration, floating color, and discoloration.

Third, the application of ink anti-friction agent

Why does one or the other type of printing defect (failure) occur occasionally after printing inks and packaging printing using a different process after a recipe has been designed for thousands of years? But after choosing different dispersion media or different substrates and different packaging and printing processes, the printing defects will disappear. When we use another formula design and adopt a process different from the above, there will be no production process. In order to stick to a so-called universally accepted scientific theory, we must first understand the world today from a materialist point of view, break away from stereotypes, and pick out additives that can suppress these malfunctions (to compensate for ink stability). On the deficiencies, the difference between substrate (such as PH value and whiteness) and ink surface tension is crucial. In a word: why the failure occurs, we must seize the reason to deal with it.

The author superficially believes that there is simply no universal additive in the world, but the water-soluble packaging printing ink anti-friction agent is currently one of the most widely used and most economical additives. Only the application of ink is very small, not all of the faults are attributed to the quality of the ink products, but also should have the role of substrate quality, mechanical pressure, operation, environmental temperature and humidity can not be ignored.

Today, before we have yet to find a long-term, effective water-based packaging printing ink product, it may be wise to apply a water-based abrasive agent. This will break the existing packaging printing ink usage pattern and its prospects are inestimable.