UV-LED curing has the advantages of energy saving and no ozone, mercury pollution has become one of the recently developed green printing technology.The photoinitiator used to meet the requirements of food packaging materials, but also in the LED issued by the central wavelength of 385nm or 395nm light absorption can stimulate the photopolymerization.In this paper, the absorption spectra of 12 kinds of photoinitiators, such as TPO, BDK, ITX, DETX, 819,784,127,369,MBF,199,796,were characterized by UV-Vis spectrophotometer. Prepared UV-LED curing varnish,The performance of the photoinitiator was analyzed.According to the requirements of food safety regulations, the photoinitiators which could be used for UV-LED curing were obtained TPO,
Differential scanning calorimetry, X-ray diffraction, infrared spectra and fluidity evaluation experiments have been made for (80-x)TeO 2 xV 2 O 5 -20MO (M=Sn, Bi, Ca, Na and Κ) glasses as potential replacement for lead(PbO)-based glass frits with low firing temperature. Glasses with Te0 2 0-44 mol%, and V 2 0 5 39-82 mol% were found unsuitable for glass frit since they were easy to crystallize. Glasses with the content of Te0 2 54-74 mol% and V 2 0 5 9-29 mol% indicate appropriate fluidity and do not crystallize in the re-melting process at 723-753 K. The glass transition temperature of these glasses is at 544-578 K. The glass structure is given by layer upon layer mainly connected by the structure units of [V0 4 ] and [Te0 3 ]. Other modifier ions locate mainly between the layers. The isolated V=0 band from the VO5 bipyramids is not detected in the vitreous structure of the glasses presently investigated.
UV-LED curing v arnish i s m ore en vironmental. I n or der t o l et people under stand UV-LED c uring v arnish a nd exi sting p roblems of U V-LED curing t echnology a nd p rovide reference and theoretical basis for the future development of UV-LED curing varnish, the paper sketched basic composition of UV-LED varnish and curing process and pointed low initiation efficiency a nd s low c uring s peed w ere t he main p roblems of t he U V-LED l ight c uring technology t hrough r eferring t o a l arge nu mber of doc uments a nd r elated da ta. T he s olutions are suggested: First, the photoinitiators with absorption spectra matched to emission spectra of LED should be selected; second, monomers with more functional groups should be used.
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