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    What are the ingredients of uv ink?

        1. Polymerizable prepolymer The polymerized prepolymer is an important component that determines the performance of UV varnish coating. It is the most basic component in UV inks and is a film-forming substance. Its properties are related to the curing process and the properties of the ink film after curing. It plays an important role. It is generally classified according to the skeleton structure. The skeleton structure affects the hardness, abrasion resistance, adhesion, light resistance, chemical resistance and water resistance of the coating. The structure of the prepolymer is that the oligomer is Low molecular weight resin containing "C=C" unsaturated double bond, such as acryloyl group, methacryloyl group, vinyl group, allyl group, etc. Mainly epoxy acrylate resin, urethane acrylate resin, polyester Acrylic resin, polyether acrylic resin, polyacrylic acid propyl ester, unsaturated polyester resin and other resin types. Under the same conditions, the photocuring speed of the acryloyl group is the fastest, so the oligomers are mostly acrylic resin.
        2, photosensitive monomer (reactive diluent) UV ink and UV varnish need to have the viscosity of the coating machine when coating, generally by adding 20% to 80% of the monomer to reduce the viscosity of the prepolymer, At the same time, the monomer itself polymerizes and becomes a part of the cured film. The reactive diluent, also called cross-linking monomer, is a functional monomer, and its role in the ink is to adjust the viscosity, curing speed and curing film performance of the ink. The reactive diluent also contains a "C=C" unsaturated double bond, which may be an acryloyl group, a methacryloyl group, a vinyl group and an allyl group. In view of the fastest photocuring rate of the acryloyl group, the currently used active dilution Most of the agents are acrylate monomers. Due to the different amounts of acryloyl groups, they can be divided into three types: monofunctional groups and difunctional groups. The release effect and curing speed of various functional group reactive diluents are different. Generally speaking, the more functional groups are. More, the faster the curing speed, but the worse the dilution effect. Traditional reactive diluents, such as styrene, first-generation acrylate monomers, etc., are very toxic, and some acrylate monomers have strong skin. Stimulating effect. To reduce activity The irritating effect of the release agent on the skin is usually two ways: one is to use ethylene oxide, propylene oxide and hexyl ester ring-opening polymerization to increase the molecular weight of the monomer; the second is to change the monomer ester structure; Previously, alcohol esterification method was used. When alcohol was added to acryloyl group, the skin irritation of polyfunctional monomer was greatly reduced. For example, when neopentyl glycol diacrylate was esterified, pH value (skin irritation index) ) is 4.96, and when synthesized by the addition method, the pH is lowered to 0.3. Recently, some monomers having good properties such as alkoxy acrylate, carbonic acid monoacrylate, imidazolyl monoacrylate, etc. have been developed. Ring carbonate monoacrylate, epoxy silicone monomer, silicone acrylate and vinyl ether monomer.
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