Filled With Hydrotalcite Preparation And Properties Of Pvc Materials

In this thesis, Poly (vinyl chloride) (PVC) resins filled with different content hydrotalcite, which was surface-treated with titanate and silane, were prepared on two-roll mill. The compatibility of hydrotalcite in PVC resin was investigated by TEM and influences of different hydrotalcite content on static > dynamic thermal stability were studied by methods of Congo red test, thermal gravitation balance(TG) and Barbender torque rheometer. The results show the compatibility and thermal stability of hydrotalcite surface-treated with titanate in poly (vinyl chloride) resin is best compared to silane. The poly (vinyl chloride) resin filled with organic Sn and hydrotalcite possess better static and dynamic thermal stability than it filled with organic Sn singly. The heat stability effect of PVC filled with lphr hydrotalcite and 1.5phr organic Sn was similar to it filled with 2.5phr organic Sn singly. The fluid property of PVC resin filled with hydrotalcite surface-trated with titanate was studied by means of Barbender torque rheometer and capillary rheometer. The results showed in certain range hydrotalcite can reduce the melt viscosity of PVC resin, this is advantageous to the processing of PVC resin and optimum content of hydrotalcite was 1%-2%. According to experiment results, hydrotalcite was also a kind of good flame retardant and smoke suppressant for PVC. Impact and tensile strengths of PVC filled with hydrotalcite were studied. The results showed that in certain filling range the impact strength of PVC resin was almost unchanged. When the content of hydrotalcite was more than 5phr, the impact strength decreased greatly. The heat-stabilizing mechanism of hydrotalcite on PVC resin was studied tentatively by means of IR spectrometry and UV spectrometry. The results showed hydrotalcite could absorb HC1 that had catalysis on degradation of PVC resin, so hydrotalcite could improve heat stability of PVC resin.