Synthesis, Application And Characterization Of A Kind Of High Speed Curable Photocurable Resin

Photocurable resin is one kind of special resins which has general-purpose advantages, and it is consist of photocurable prepolymer, active diluents and photo initiator. Its applications are very extensive, and it is getting more and more attention. Photocurable resin has been growing very fast these years of its advantages such as saving energy, producing little pollution, quick curable velocity, more productive and it is suited for pipelining. Dendrimers and hyperbranched polymer are the up to date result of research, the particular properties were endued by the particular molecule structure.A kind of photocurable resin was synthesized through Michael addition of acrylate containing polybasic double bond such as TMPTA with polybasic aliphatic amine such as ethylenediamine and triethylenetetraamine. In common use active diluents of photocurable resin such as TMPTA or TPGDA, 30mol% in theory ethylenediamine was added in and reacting in room temperature(25-30℃) for 10 hours, insitu, multifunctional hyperbranched photocurable resin oligomers were obtained. The reacted proportion can be calculated by the integral area of 1HNMR, and the actual proportion which double bonds have been reacted is 29.68mol%. The result showed that the photocurable resin was a mixture of 30% polybasic double bond oligomers and 70% active diluent e.q.TMPTA(or TPGDA), The result which characterizaled by 1HNMR and GPC showed the main composition of the polybasic double bond oligomers is the hyperbranched photocurable resin oligomers which have 8-12 double bond acrylate monomer and its dimer and trimer.The reacted proportion of double bond acrylate monomer under UV can be showed with the change of the height of the absorb peak at1635.8cm-1. The most important two items of performance for UV photocurable resin are viscosity and curing speed,compared with the homologous mixture of photocurable oligomers that was composed with 30% linear 604 and 70% TMPTA or the mixture of photocurable oligomers that was composed with 30% linear 244 and 70% TMPTA, the viscosity of hyperbranched photocurable resin is only 1/3-1/2 of that of the two linear polymer mixture, and the curing speed of hyperbranched photocurable resin is 7-90 times quicker than of the linear polymer mixture.The result can be explained with: the shape of the hyperbranched photocurable resin oligomers is ellipse ball, there is no intertwist in the molecule chain, there is little friction among the molecules, the viscosity of hyperbranched photocurable resin is more lower than the linear photocurable resin oligomers with the same molecular weight. Hyperbranched photocurable resin oligomers has multiple end functional groups, the periphery of the molecule has a lot of high active photocurable group ?double bond of acrylate. Hyperbranched structure induced the double bonds are very easy to be polymerized and little confined by the cross-linking network. The UV curing speed is very quick, and the transformation is very high.Owing to adding minimum polybasic aliphatic amine such as ethylenediamine in the ordinary active diluent, to mix up in room temperature, the technics is very handy, the product can be directly used, the cost nearly not added, but the performance was greatly improved, it can be easily popularized. We have a conviction that the hyperbranched photocurable resin has a bright foreground.