Preparation Of Catalyst With PU Prepolymer Grafted L-Hyp And Development Of High Temperature Anticorrosion And Thermal Insulation Coating With Temperature Indicating

The asymmetric catalytic reaction by L-proline,L-proline and the method of L-proline immobilized on polymer were summarized in the dissertation. The aim for the project of high-temperature anticorrosion coatings, heat insulation paint, high temperature resistant binder resin and temperature indicating coatings was also described. The synthesis of diethyl 2-(2 cyanoethylated) propylene acid catalyzed by L-proline was studied. The synthesis of polyurethane prepolymer grafted L-hyp catalyst and its application on Michael reaction were explored. High temperature corrosion primer, heat insulation paint, closed reflecting coatings and overtemperature alarm coatings were synthesized and its application tests were carried out.(1) Diethyl 2-(2-cyanoethyl) malonate was prepared by Michael reaction from diethyl malo-nate and acrylonitrile catalized by L-proline. The effect of reaction time, reaction temperature, the amount of catalyst, the ratio of feed and the solvent on the yied and ee value was studied. The yied of 74.10% and the ee value of 79% were abtained at 35℃for 48h using pyridine as solvent. The results illustrated that the effect of reaction time, the amount of catalyst and the ratio of feed did not affect the ee value obviously. The solvent affect the ee value significantly.(2) Polyurethane grafted L-hyp was synthesized by reaction of polyurethane prepolymer with L-hyp protected by amino which left off after reaction. Polyurethane prepolymer was obtained by reaction of TDI with one suo glycol, polyether-204 and TMP respectively. The reason why the catalytic ability of Polyurethane grafted L-hyp was weaker than L-hyp needs to be studied.(3) The performance of silicon resin modified by expoxy was studied. The integrated performance of expoxy modified silicon resin synthesized by chemical method was good. Using cashew shell oil modified amine as curing agent, using ND-42 as promoted agent and added with silicates, the film could be used as adhesive of high temperature paint. The performance of the commercial H-4 is also good, which could be applied in high temperature paint.(4) The effect of P/B, pigments and fillers composition and amount and the additives amount on the paint performance was studied. The technology of bottom anticorrosive coatings was confirmed. The experiments illustrated that the P/B between 1.4:1～1.6:1 is favorable. The anticorrosion properties of the pigment is good, and the anti-high temperature performance is perfect.(5) The heat insulation of hollow ceramic beads, ceramic drift beads, expanded vermiculite and expanded perlite powder was studied. The effect of P/B, fillers amount and additives on the paint properties was also studied, while determining the technologh of the heat insulation paint. The ideal P/B is between 2.2:1 and 2.5:1. The anti-cracking and anti-high temperature performance improved by treating paint using KH550. The insulation temperature difference reached 30℃when the thickness of the paint was 1.5 mm.(6) The sealing properties of the paint prepared using The float type aluminum powder, mica powder, precipitation barite ore and talcum powder as pigment is good, and the insulation properties was also improved in some degree. The proper pigment to binder ratio of reflective coatings sealed paint is between 1.6:1～1.8:1.(7) The color-changing properties of makings resin, indigo, and the effect of inositol on color-changing temperature, P/B, pigments and fillers amount were studied. The results illustrated that the properties of temperature indicating coatings prepared with 1053 type silicon resin as makings resin, with indigo and inositol as color-changing pigment, with titanium dioxide as contrast color, with talcum powder as fillers reached the requirements.(8) The middle-industry production of the paint and the sampling test were carried out. The results illustrated that the properties of the paint met the requirements. The coating of the paint was not destroyed after one-year use. The insulation properties of the paint was related with the coating thickness. The insulation temperature difference reached more than 20℃when the thickness of the paint was more than 1.1 mm.