Organic coating

ADHESION AND ENVIRONMENT
Adhesion (property of atoms or molecules of a substance consisting of atoms or molecules attract other substance with which they do not have a chemical bonding, or state in which two bodies are held together by interfacial forces which may be valence forces or action and crossed both) plays an important role, most importantly, in surface coatings, and particularly in the screen printing inks, since it is the foundation of all screen coating on the fact which is part of the support, forming a single body, united (Glass, PVC, PP, PE, PC, PE, PET, PMMA, aluminum, steel, wood, etc) by the affinity of adhesion, or by the solvation of the medium due solvents in the formulation.

To date, most of the time, the ink formulations for PVC and others have been and are made with some solvents (Isophorone Cliclohexanona, vynil pyrrolidone 2 etc) so that the ink provides a good grip on the substrate at the expense of These thinner, an ink made with vinyl vinyl resins never join on PVC or PMMA, with the help of the aforementioned solvents.

The vinyl pyrrolidone 2 years ago that this obsolete because it is carcinogenic (toxic Pictogram T) Isophorone is irritating to the eyes, respiratory tract from the skin so. (Pictogram for Xi irritant), the cicloexanona damages (Pictogram for harmful Xn) this solvent is the least harmful to the health of those who act as promoters of adhesion but often by their volatility is not enough bonding agent on rigid PVC, methyl, etc..

Not to mention oil, heavily polluting the environment.

To get a good grip on any substrate either plastic, wood, steel or aluminum, the bond must provide products that meet the above definition, making vehicles (resins and additives) with the properties mentioned in attracting atoms print media, which maintains a force of attraction and cohesion to ensure a total grip over a very long time, in addition to providing resistance for a coating, such as chemical resistance and physical demands of us the consumer, such as resistance to alcohols, alkalis, acids, alkalis, weathering, salt spray etc.

This usually is achieved with inks and paints of two components, which usually has very good adhesion a very large number of substrates, in addition to a very high solids content, thus avoiding having to resort to harmful products, irritating and harmful to health . The ability of isocyanates to be combined with some elements on the surface of the substrate to be printed is amazing at times, mostly on plastics such as PVC, methacrylate, polycarbonate, polystyrene, (do not forget that the inks made with alcohol, not harmful to health, not adhere on polystyrene) and other types of plastic, these products appropriately respect the environment. Sometimes the grip achieved by using temperatures higher than those of the environment, ie curing coatings
from 80 to 200 º C, in inks and coatings of two components, for surfaces such as stainless steel, brass, aluminum, polished, painted surfaces are difficult to grip in the latter case the drying temperature should be slightly lower than Tg (glass transition temperature ) of the painting, ie the point at which the paint film softens slightly with temperature and then printing ink is the kind that is attached, in addition to improving adhesion, resistance of printed films.

The poliaminoamidas and polyamides, which are the tubs of Epoxy hardeners, have very good adhesion on the following substrates, Glass Aluminum, Copper, Brass, Ceramics, Silver and Gold, Formica, painted surfaces etc. but since these are more harmful to health than isocyanates, in contrast, if the inks are formulated properly respect the environment, but not aspirated
the water.

New Generation inks to water or water for PVC and other if they are made without coalescing (Thinners), they are respectful of the environment and the health of the user,

The resins containing paints or inks in aqueous dispersions of resins are suspended in water, or colloidal state, ie are finely suspended
in the liquid resin particles are solid (the same that are used to produce solvent inks) to join a continuous film formed by means of heat or by joining with one another, also without heat through the solvation of resin using the solvent as appropriate in each case, according to the type of polymer, if type acrylic, vinyl, polyurethane, etc. These dispersions have been removed by evaporation when 25% of the water contained in them is when they start coalecer ie soldiers to join with each other and the particle as previously mentioned, but if we work with extenders to produce this phenomenon and not care for the environment, whereas if we put an ink dispersion, with a TMFF (minimum temperature of film formation), less than 5 º C, not to work with any thinner and this will result in a product with a great respect for the environment, achieving a perfect grip.

One of the drawbacks with some inks are water-drying is slower when applied on a support nonabsorbent, however today it is being formulated aqueous inks with extraordinary properties of rapid expulsion of water from reaching film printed Sometimes the speed of conventional PVC.

Another disadvantage of these dyes when they contain substantial quantities of diluents is that the user to remove the waste ink and wash these screens can not eliminate the drainage of its industry, it must treat them as normal until the inks today, if they do not contain diluents then depend on the ecotoxicity of the components of the ink, for example according to the type of fungicide, which are not biodegradable, but in most cases are usually not harmful because any product that has no solubility in water of rivers or seas, apparently does not harm our wildlife.

The water-soluble inks and coatings can make all kinds of paintings echo long since done, Polyurethane, Epoxy, Acrylic, Vinyl, Gliceroftalicas, Etc. One-two components.

This thinner and achieve optimal product for the environment in general.

Long ago that we talking about the water-based paints and inks, and all ink manufacturers have developed and some have even sold, but
industry tends to reject screen because I think it is a novelty for the time being unprofitable, and that this must be changed throughout the game screens
install other methods of drying and then an ink that will never be with water as the drying ink for vinyl to a diluent, for vending machines with drying tunnel which is now built, tunnels of up to 5 meters with cooling zone, where the actual drying of the printed surface is at about 45 to 60 seconds. But in return we must work with water, we do not have to worry about exit gases, not by burning them in their outputs as shown with the EU and the municipalities concerned.

The UV-cured inks are respectful of the air, but not highly recommended at workshop, or to flora, aquatic fauna, or vegetation.