Preparation Of UV Hyperbranched Prepolymer And Application For Functional Coatings

UV(Ultraviolet)coating materials are used in various industries for the fast-curing, low-emissions of VOC(organic solvents) and eurytropic features. This paper states an innovative method to prepare the photosensitive hyperbranched poly(amine-fat) and ATO powder for the preparation of UV-curable coatings. These UV-curable coatings show low viscosity, high curing speed, high rigidity and high dispersion of pigment. They are used for the forming of the glass heat preservation insulation coating.The first part of this paper states the preparation of the photosensitive hyperbranched poly(amine-fat) prepolymer with melamine, formaldehyde, diethanolamine, and methyl acrylate as starting materails. Impacts, such as temperature, time, amount of catalyst and other factors, were investigated to optimized the reaction condition on the synthesis of hyperbranched poly(amine-fat) in this paper. Monomers were characterized by FT-IR, and GPC method was applied to measure the molecular weights with their distributions, as well as the branching degree of the hyperbranched poly(amine-fat) prepolymer. The synthesis method and suitable reaction condition are as follows: 1) Hexahydroxylmethylelamine was synthesized through hydroxymethylation reaction, in which the mixture of elamine and formaldehyde are stirred for 3.5 h at 70℃with 1:8 as the ratio. 2) N, N-dihydroxyethyl-3-amino acrylate were prepared with the mixture of diethanolamine and acrylate stirred for 4.5 h at 35℃. The ratio of starting materials were 1:1. 3) With 1:24 as the suitable ratio of hexahydroxylmethylelamine and the N,N-dihydroxyethyl-3-amino acrylate monomer, the reaction lasted for 4 h at 120℃to prepare the novel hyperbranched poly(amine-fat) prepolymer. 4) With 1:26 as the reaction ratio of hyperbranched poly (amine-fat) prepolymer and HEMA, the reaction lasted for 3 h at 90℃to prepare the photosensitive hyperbranched poly(amine-fat) polymer. The product showed the features of low viscosity, high curing speed, high hardness and high dispersion of pigment.The second part of this paper states the preparation of metal-doped tin oxide nanopowder(ATO) by combustion method. The mixture ratio of Sb2O3 and SnO2 is 1:7. Then the mixture was treated with citric acid and follow by nitric acid. Precipitate was obtained by neutralizing the mixed solution with concentrated ammonia. This solid was treated in muffle at 300℃for 2 h, and finally calcined at 600℃to get azury ATO. XRD analysis revealed that there was no antimony in powder lattice. SEM investigation suggested that the particle size of the power was 50 nm.The third part of this paper states the preparation of heat preservation insulation coating material by the photosensitive hyperbranched poly (amine-fat) prepolymer, ATO, TMPTA, TPGDA, Darocure1173 and auxiliaries. The glass cavity was used to simulate the indoor environment and the tungsten lamp was used to simulate the sun light. The glass cavity with insulation coating showed lower rising rate of temperature. For same exposure time, the temperature is 8-10℃lower comparing to the blank glass cavity with insulation coating with 0,1%,2%,3%,4%,5% ATO powder. It indicated that the product of UV glass heat preservation insulation coating showed an excellent performance and good heat preservation effect. It has an excellent value and marketing prospects...