UV ink composition: photosensitive monomer
UV inks and UV varnishes need to have the viscosity to adapt to the coater when coating, generally by adding 20% to 80% of the monomer to reduce the viscosity of the prepolymer, while the monomer itself occurs polymerization and becomes part of the cured film. Reactive thinner, also called cross-linked monomer, is a functional monomer, its role in the ink is to adjust the viscosity of the ink, curing speed and curing film properties. Reactive diluent structure also contains “C = C” unsaturated double bond, can be acryloyl, methacryloyl, vinyl and allyl.
Given that acryloyl is the fastest light curing speed, most of the reactive diluents used today are acrylate monomers. Due to the number of different containing acryloyl, can be divided into mono-functional groups, bifunctional groups three categories, all types of functional groups of reactive diluent release effect and curing speed are different. Generally speaking, the more functionalities, the faster the curing speed, but the worse the dilution effect.
Recently, the development of some very good performance monomer, such as: alkoxy acrylate, carbonic acid monoacrylate, imidazolyl monoacrylate, cyclic carbonate monoacrylate, epoxy silicone monomer, silicone acrylate, and vinyl ether monomer, etc.. When choosing monomers, the following principles should be followed.
1. low viscosity, good dilution effect;
2. Fast curing;
3. good adhesion on the material;
4. Low skin irritation, low toxicity;
5. Does not leave odor in the coating.
Traditional reactive diluents, such as styrene, the first generation of acrylate monomers, etc., they are very toxic, and some acrylate monomers have a very strong irritating effect on the skin. In order to reduce the irritation of active diluents on the skin, there are usually two methods: one is the use of ethylene oxide, propylene oxide and has been ester ring-opening polymerization to increase the molecular weight of the monomer; the second is to change the structure of the monomer ester group; and another is to change the previous use of alcohol esterification method.
In the use of alcohol addition to acryloyl, so that the polyfunctional monomer skin irritation greatly reduced, such as neopentyl glycol diacrylate using esterification synthesis, PH value (skin irritation index) is 4.96, while the use of addition method of synthesis, PH value reduced to 0.3.
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