Studies On The Physical And Chemical Properties Of Partially Hydrolyzed Cpp-g-mah

The application of chlorinated polypropylene gets more and more abroad with the rapid development of automobile industry, For the sake of widening range of uses and boosting the market competitiveness of polypropylene, it needs to be coated by covering materials so that its products reach more perfection.It is found that chlorinated polypropylene(CPP) which is made from polypropylene has good adhesion to PP. The quantity demanded of CPP is increasing year by year. The consumption structures of CPP are that the bonds account for 40%, the printing ink vehicles account for 40% and the others account for 20%. So, studies on CPP and technical development in CPP are very important.The weakly polar of CPP resulted in low dissolved in polar solvents. Used as primer, the performance of adhesion, oil resistance, water resistance were not good enough. Used as coating paint, it is difficult to compound due to the poor miscibility with the common resin coating. So malefic anhydride(MAH) was grafted to chlorinated polypropylene in order that the polarity of CPP becomes strong.Previously, our laboratory was studying on the research of graft-modified chlorinated polypropylene, and MAH was grafted to CPP by master Ma Xiangdong in our lab, and five different synthetic products in grafting yield of MAH were made. And Dr. Fan Zhonglei mentioned, in his papers, that the hydrolysis is existent in the process of purification.In order to study the properties of the partially hydrolyzed CPP-g-MAH, in this paper, firstly, five grafted product with different grafting yield were synthetic according to MA's methods, and drying in a vacuum drying oven. The acetone was recycled using in purification. The grafting yield was estimated by acid-base titration. Synthesis of malefic anhydride grafted chlorinated polypropylene was studied, and it is proved that malefic anhydride was partially hydrolyzed according to IR spectrum. The rate of relative hydrolysis is: 50.9%～56.1%.Because the polarity was changed with the different of hydrolysis rate, next, the solubility parameter of five different products was estimated by the methods of turbidimetric titration, and found that the solubility parameter of grafted product became larger as a result of hydrolysis. Having a linear fit, we found the grafting rate into a better linear relationship with the solubility parameter. The solubility in 27 solvents was studied according the standard of Hansen. The three-dimensional solubility parameter was optimized and calculated, and a preliminary comparison with the results of FAN's was carrying on.Aim at the weakness of CPP property research at present, systemic studies to volume properties, viscosity properties, solubility parameter and surface tension properties were carried through in the thesis. The densities, viscosity, surface tension for binary mixtures of CPP and MAH-g-CPP with toluene, tetrahydrofuran were determined at temperatures 293.15K and 298.15K.This systemic data supply basic data for project design and research of CPP.