The composition of the waterless offset ink is similar to that of a general offset ink. It is composed of a pigment, a resin binder, a solvent and a diluent, a Qi material, and an auxiliary agent.
Waterless offset inks use pigments similar to normal offset inks except for carbon black pigments. Both organic pigments and yellow pigments have benzidine yellow (PY-12, PY-13, PY-14, PY-83, etc.). The red pigments are Lithol Red (PR-49: 1), 6B Magenta (PR57: 1), Golden Red C (PR-53: 1), 2B Permanent Red ((PR-48: 1) Blue Pigments For the blue (PB-15: 1), the green color is for the enamel, etc. For the pigment, it accounts for 15% to 25% of the total amount of ink.
2, resin connection material
The main resin used is similar to ordinary offset printing inks in major categories. The commonly used resins for waterless offset printing inks are rosin-modified phenolic resins, colloidal rosin-modified phenolic resins, and vegetable oil-modified ingestion resins such as linseed oil. However, due to the absence of evaporation of the fountain solution during waterless offset printing, the temperature sensitivity of the printing process is relatively high (this has been improved by mechanical devices) and thus has a special rheology for the resins that make up the ink. Performance requirements. In particular, the elastic effect on the drilling of the resin binder should be more noticeable. Generally, the elasticity of the drill is higher than that of ordinary offset inks, but the properties inside are slightly softer. The two are contradictory, but trying to find a suitable balance is the focus of ink formulations. In addition, the resin binder must have a suitable high cohesion material so that the ink can be completely and cleanly removed and transferred from the plate and the blanket.
The elasticity of the resin component and the size of its molecular weight crosslinks and the degree of branching has a more complicated relationship. Generally, a resin with a molecular weight of 210,000 to 400,000 can be used. The higher the molecular weight, the greater the degree of branching and the degree of textual association, Higher elasticity is achieved, but the solubility in vegetable oils and mineral oils is reduced. Therefore, the degree of resin absorption in the solvent should also be very careful.
The commonly used rosin modified phenolic resins used are bisphenol A, tert-butyl phenol, cyanhydrin, nonyl phenol, dodecanoside, etc., and also have maleic acid modified rosin vinegar resin.
In recent years, the United States Sun Chemical Company and Gonglinte Ink Company have successfully developed water-washable water-free offset printing inks, which are currently in industrial trials and trials. They have not penetrated the types of resins used, but they are washable from water. The principle of the ink is speculated that the saponification of the ink can be cleaned from the printing plate or printing machine. Of course, the introduction of this ingredient can eliminate the need for the printing plant to use an organic solvent cleaning agent, but the alkali resistance level of the printing product must be improved. decline.
Ultraviolet (UV) and electron beam (EB) cured waterless offset oils are also under development. Cyclic acrylic vinegar, poly acrylamide vinegar, and polyazo acid acrylate can all be used as the main polymer of the binder.
3, solvents and thinners
In the printing process of waterless offset inks, the clear and complete stripping of ink from the image portion of the plate is one of the key factors for obtaining high quality prints. Over the years, the industry has gradually reached a consensus on the stripping mechanism. The theory of the â€œinterface diffusion boundary layerâ€ has been accepted by many researchers. The theory is that the solvent in the ink diffuses into the layout to form a thin liquid film layer so that the adsorption force of the rubber to the ink is much smaller than the cohesion force of the ink. This is advantageous for the ink layer to completely peel the printing plate, and then transfer to Blanket and paper. According to this theory, the choice of solvent in the ink appears to be very important, and it will contain multiple components (including additives). Earlier patents have reported this, such as the addition of liquid organic polysilazane in the ink solvent. There are also some patents reported that the addition of non-ionic surfactants with an HLB value of 11-15 (such as ethers of polyoxyethylene or propanone, diethylenediglycol, drunk hexyl ether, etc.) can be very effective. The study also suggested that the use of vegetable oil derivatives such as rapeseed oil vinegar, oleic acid vinegar, etc. as a co-solvent can reduce the drillability of the ink. Drilling value and elasticity value increase.
In addition to these functional solvents, mineral oils commonly used in offset printing inks and vegetable oils such as soybean oil and linseed oil are still important diluents.
4, slope and additives
The types of grave materials are similar to those of conventional offset inks. Calcium carbonate, calcium antimony white, and barium sulfate are still selected. Auxiliaries include wax wear resistance auxiliaries in the amount of 0,5% to 2,0"/Q naphthenic acid drill, manganese naphthenate and other desiccants (if needed in the formulation), the dosage is 1% to 3% Other additives with special functions.
Offset offset printing is a more complex printing method to eliminate fountain solution, improve print quality, increase production efficiency, and is more environmentally friendly, but the development of a special waterless offset ink to match the surface characteristics of the new plate to achieve a smooth ink There is still a lot of ink formulation work to be done to deliver, strip and transfer, and we need to continue to develop this new area that is evolving.
Reprinted from: Ink Information
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