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Film forming process of waterborne UV ink printing

by:WenJie     2020-04-19
Drying mechanism of waterborne UV light curing system there are still controversial, it is generally believed the drying mechanism of waterborne UV ink is: through drying device in addition to water, under ultraviolet light, light initiator absorb radiation energy into free radicals or after cation, cause polymerization, polymer coupling reaction, in a short period of time to a three-dimensional network of polymer. Radiation curing system according to different light initiator types can be divided into the system of free radical and cationic system, due to the radiation curing ink multi-purpose free radical system, in the process of the development of water-borne UV ink is recommended to use free radical system. Water-borne UV ink film-forming process roughly divided into two stages: 1, pre evaporation drying mechanism is dry before curing light must have a working procedure, to carry on the preliminary drying will not result in the end result is not ideal of curing light. Uv curing water-based ink generally adopt the proper heating method, such as infrared baking or hot air drying, early to shorten the process of evaporation. As moisture volatilizes, decentralized state of polymer particles gradually, but still can freedom of movement. Then with moisture volatilizes further, the polymer particles reach close packing, become irreversible touch each other, it is generally believed the theory of solid volume content of 74%. 2, uv curing late film-forming mechanism, the dispersed phase particles began condensation, which still remain about 3% moisture. At the same time, the molecule in curing light initiator containing functional groups in the dispersed phase particles under the cause of interface and the internal curing reaction. The curing process in general can be divided into four stages: (1) interaction between light and light initiator, it may include the interaction between light absorption and light initiator; (2) light initiator molecules rearrangement, free radical intermediates formed; (3) the unsaturated group role of free radicals and oligomer trigger a chain or polymerization; (4) polymerization continues, the component of liquid into a solid polymer.
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