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Improvement of Preparation Process of Posphazene and Research on Flame Retardancy of ABS Doped with Posphazene

Author: JianHaiFeng
Tutor: LiZengHe
School: Beijing University of Chemical Technology
Course: Chemical Engineering and Technology
Keywords: Phosphazene flame retardants ABS Hexachloro cyclotriphosphazene Melt ring-opening polymerization Graft to replace
CLC: TQ314.248
Type: Master's thesis
Year: 2010
Downloads: 294
Quote: 3
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Abstract


ABS is a thermoplastic engineering materials have applications in the electrical industry, light industry, automobile industry and pipe fittings, etc., but due to its very low oxygen index, the amount of smoke, seriously affecting its security, so its is particularly important to the study of the flame retardant properties. Phosphazenium phosphorus, nitrogen-rich material because of its structure, and thus the good flame retardant properties, and chlorine in their structure which may be substituted, and broken down into smaller molecules, so phosphazene material is environmentally friendly flame retardant material. Polyphosphazene for both flame retardant ABS flame retardant effect and can better keep the other properties of the ABS, and thus the development the phosphazene retardant material to be applied to the broad outlook for the ABS system. The main topic was the work of the following four aspects: monomer hexachlorocyclohexane three phosphazene synthesis; monomer ring-opening polymerization of linear poly dichlorophosphazene; monomer substituted linear phosphazene access polydichlorophosphazene The branch replaced Preparation phosphazene hybrid; phosphazene hybrid ABS flame retardant properties by thermal gravimetric analysis. Acid scavenger in the first part of the composite catalyst method were synthesized monomers hexachloro cyclotriphosphazene, and analysis and comparison of the relationship between the two methods, emphasis on the reaction time of the catalyst composite method, the kind of catalyst, the reaction mass improve the ratio of raw material particle size on the yield of the the composite catalyst synthesis process and the follow-up process of the two methods, the purity of the product, summed up the process route more suitable for industrial production. The second part melt open the polymerization reaction temperature and time were investigated in 250 ° C, 10h and 270 ° C, 4h under better synthesized linear poly dichlorophosphazene. Part III were synthesized six (acrylic acid-hydroxy ethyl group) cyclotriphosphazene, poly (hydroxyethyl acrylate yl) phosphazene, poly diethoxyphosphoryl nitrile, and hydroxyethyl acrylate group substituted poly dichlorophosphoryl nitrile synthesis process is to be improved, through the IR characterization showed that the target product was obtained. The fourth part of the phosphazene substitution product added to the ABS, and its thermal gravimetric analysis, each of the graft polyphosphazene weight loss temperature of ABS upgrade. Finally, on the basis of summing up the results of the study, it is recommended that future research should strengthen the ring-opening polymerization, Material Modification of research to improve the yield and molecular weight of the ring-opening polymerization and flame retardant material and the substrate material mixed .

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CLC: > Industrial Technology > Chemical Industry > Molecular compound Industries ( polymer industry ) > Raw materials and auxiliary materials > Synthetic polymer compound > Additives > Flame retardants
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