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Preparation and Characterization of Poly(Vinyl Chloride)/Nanometer Hydrotalcite Composites

Author: ShuWenXiao
Tutor: HuangZhiMing
School: Zhejiang University
Course: Chemical Engineering
Keywords: PVC Nano Hydrotalcite Composites Situ polymerization Acrylate polymer
CLC: TB383.1
Type: Master's thesis
Year: 2005
Downloads: 235
Quote: 3
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Abstract


Hydrotalcite is an anionic layered inorganic materials, polyvinylchloride (PVC) having a heat stabilized, flame retardant and smoke suppression effect. In this paper, prepare a comprehensive performance good PVC / hydrotalcite nano composite material in order to improve the nano-hydrotalcite dispersion uniformity and to reduce the size of dispersed phase in the PVC matrix target for vinyl chloride (VC) / surface-treated nano-hydrotalcite in situ suspension polymerization, the polymer / hydrotalcite in situ at the same time generate a prepared acrylate polymer / sodium dodecyl sulfate Hydrotalcites (ACR / SDS-HT) complexes and its melt blended with PVC composite, were used to characterize the structure and performance of the composite of PVC / within meters hydrotalcite. Previous small pilot study based on the surface of the zinc stearate in 100 liters of industrial test reactor deal with the presence of the VC nano hydrotalcite situ suspension polymerization, the the nano hydrotalcite Add amount of the polymerization process, the composite resin particles features and performance found in situ suspension polymerization, feeding methods of hydrotalcite coating effect of the PVC particles have a significant impact, pour feeding methods can make the hydrotalcite good coating inside the PVC particles. Nano hydrotalcite added slightly affect the particle characteristics of PVC, PVC molecular weight has little effect. The whiteness of the PVC composite resin, thermal stability time and the thermal decomposition temperature is increased with the increase of added amount of hydrotalcite exhibit good heat stabilizing effect; heat resistant temperature of the PVC article is also improved. PVC composite resin obtained by the in situ suspension polymerization after processing, agglomeration nano hydrotalcite dissociation, uniformly dispersed in the PVC matrix among the nano-scale, the tensile modulus and tensile strength of the composite material with the nano-hydrotalcite added amount increases, and there is the added amount of the hydrotalcite of the impact strength significantly improved best nano. The use of polymer / intercalated hydrotalcite simultaneously generate synthesized ACR / SDS-HT complex prepared by coprecipitation dodecyl sulfate pillared hydrotalcite. Dodecyl sulfate-modified hydrotalcite and hydrotalcite charge action exists, the ACR molecular chain portion intercalation, improved thermal stability of the sodium dodecyl sulfate and ACR. Using the ACR / SDS-HT Hydrotalcites complexes with PVC melt processing, preparation of hydrotalcite partially peeled, dispersing small size and uniformly dispersed, a certain orientation of PVC / hydrotalcite nanocomposites; while the use of sodium dodecyl sulfate plug layer hydrotalcite the the PVC melt processing, it is difficult to achieve hydrotalcite intercalation and nano-dispersed. With the increase of the added amount of the complexes of the ACR / SDS-HT, shorten the PVC plasticized time processing to increase the tensile strength and Young's modulus, the impact strength increased to about 2 times that of pure PVC, exhibit good consolidated change effect is obtained.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
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