Synthesis And Study Of New Polymerisable Hyperbranched Macromolecular Photoinitiators

Uv-curable is a new, have a good prospects and environmental new technologic Uv-curable coating develops rapidly and shows a lot of outstanding properties,such as solubility, ductility, thermostability, ageing resistance, transparency and adsorbability so that these properties expands the using field and promotes the development of the Uv-curable coating. Ultraviolet initiator is an important component of the uv-curable process,it is the key factor of polymerization for initiating Ultraviolet initiator is significant role in the uv-curable coatings system.Using diethanol amine and anhydride as the reactant, through amide reaction to synthesize a type AB2monomer MA-DEA. The structures were characterized by FT-IR and the determination of acid value, to determine the optimum reaction time, temperature, ratio of reactants.Esterification reaction proceeds between the AB2type monomer MA-DEA and trimethylolpropane.The reaction synthesizes successfully two generations of the hydroxyl hyperbranched poly amino ester:MDT-1and MDT-2.The structure is confirmed by FT-IR and determined acid value and get the best synthesis condition of the MDT-1.A certain amount of maleic anhydride can be respectively with two generations of hydroxyl-terminated hyperbranched polyurethane reaction, synthesis can be aggregated hyperbranched end carboxyl polyurethane:MDT-1-MA and MDT-2-MA. Through the acid number test to determine the reaction degree, and by measuring the content of double bond, determine whether double bond polymerization occurs, determine the MDT-1-MA reaction conditions for synthesis.Two generations hyperbranched, MDT-1-MA-1173and MDT-2-MA-1173, was obtained by reaction of the polymerizable hyperbranched terminal carboxyl polyurethane with photoinitiator1173.The degree of progress of the reaction was measured through detectionof the acid value, to make sure whether occurrence of double bond polymerization is by measuring the content of the double bond.According to the results, synthesis conditions of product MDT-1-MA-1173are:n (MDT-1-MA):n (1173)=1:6, P-toluene sulfonic acid dosage for total system quality1%, reaction temperature for90℃, extracting the water under reduced pressure, the reaction time for 6h.The best synthesis condition of the MDT-2-MA-1173.Reactant ratio for MDT-2-MA and1173forl.15:1.with as p-toluene sulfonic acid1%of the total quality reacting the water of reaction system,the reaction temperature for100℃,under reduced pressure state extracting the water of reaction, reaction time for7h.By FT-IR of DMT-1-MA-1173and DMT-1-MA-1173structure characterization, shows that the synthesis of target products. By using DSC analysis1173, MDT-1-MA-1173light trigger EN205polyurethane curing film thermal stability. By using Kissinger method, Flynn-Wall-Ozawa method simulation calculation1173,DMT-1-MA-1173light trigger EN205polyurethane curing membrane kinetic parameter.Flynn-Wall-Ozawa method to calculate the activation energy is lower than the Kissinger method. Use Flynn-Wall-Ozawa method, modification of curing film thermal stability is higher than the unmodified membrane curing is6.74kJ/mol. Kissinger method to calculate the activation energy, also shows that the modification of the cured film thermal stability is higher than the unmodified membrane curing is2.90kJ/mol. Under different heating rate TG with Kissinger, Flynn-Wall-Ozawa, the result is also modify, activation energy is higher than for modification.