Preparation And Application Of A New Polyester Catalyst

Tetrabutyl titanate and Tetraethoxysilane are used to prepare titanium composite catalyst. The relationship between esterification time, catalyst yield and reaction temperature, titanium and silicon molar ratio, amount of organic solvent, pH value, distilled water consumption, drop time are investigated using uniform design through the DPS mathematical software. The quadratic polynomial regression was used to determine the optimal process condition and the regression equation was established. The result shows that titanium and silicon molar ratio, distilled water consumption are the most important factors. The optimal preparation process conditions are obtained by experimental verification.The new synthesis catalyst’s performance was evaluated and tested. As a result, it provides a significant catalyst effect on the Poly(butylene terephthalate)(PBT) esterification and polycondensation process, and the polyester hue was improved. The amount of catalyst is prefer250ppm and the polycondensation temperature is prefer260℃.Different dicarboxylic acid and dihydric alcohol were introduced to PBT to modify the polyester’s properties. The copolyester performance were investigated.The crosslinking process of PBT copolyester with dicumyl peroxide was investigated by differential scanning calorimetry. The model-fitting and model-free approaches were applied to the kinetic study. The popular model-fitting approach gives excellent fits for nonisothermal data but yields highly uncertain values of the Arrhenius parameters. The model-free approaches represented by Friedman Equation and OFW Analysis yield similar dependence of the activation energy on the extent of conversion, indicating a multi-step mechanism of the cure process of PBT copolyester.