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Studies on Fractionations for Chlorinated Polypropylene and Alkyd Resin

Author: XuChao
Tutor: LiuDaZhuang；WangZhaoQin
School: Zhengzhou University
Course: Chemical processes
Keywords: Polymer grading Chlorinated polypropylene Alkyd resin Acid value Molecular weight distribution Gel permeation chromatography Mark-Houwink equation
CLC: TQ630.4
Type: Master's thesis
Year: 2008
Downloads: 22
Quote: 0
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Abstract


The polymer is a mixture composed by a series of different molecular weight macromolecules, which makes it having a structure consisting of non-uniformity. The classification that is the polymer sample according to the process of the composition dependence of its solubility in the solution of the molecular weight or structure in accordance with the size of its molecular weight is separated into several fractions. Fraction prepared by grading a narrow molecular weight or structure composed of evenly distributed, and other testing techniques (GPC C-NMR, DSC, X-ray diffraction, etc.) associated with, it is possible to obtain the precise macromolecular structure information. polymer graded as an analytical and preparative technology in the field of polymer structure and performance of the research and the polymerization reaction engineering have important applications in the main technical grade, were selected translational paint and two representatives of the non-conversion coatings to be studied as examples of non-transformed substance chlorinated polypropylene, mainly to study the impact of different degree of chlorination of the Mark-Houwink equation. chlorinated poly 30% degree of chlorination propylene used as ink adhesion promoter has been studied more in detail the focus of this article is investigated as paint additives chloride about 26% chlorinated polypropylene Mark-Houwink equation and its chloride and 30% degree of Mark-Houwink relationship of chlorinated polypropylene, 30% of the chlorination degree of chlorinated polypropylene range given the Mark-Houwink equation [η] = 0.0174M 0.6919 , in fact can be applied from the 26% to 35% of the chlorine content in the range of molecular weight estimates. representative of the conversion coatings, alkyd resin and the nature of the coating film made of the acid value of the classification of products, the intrinsic viscosity and the solubility parameter as well as fractions mainly investigated changes in the law in accordance with the literature published on the long oil alkyd resin grading research more short oil alkyd resin grading rarely see reported long oil domestic commodity CNPC research and short oil, and compare them; classic literature know the specific recipe, you can get the Mark-Houwink equation for commodities, however, does not know these specific recipe, in this article to find an alternative method to fitting the Mark-Houwink equation: Koh Replaced number average molecular weight, and by the acid value and the solubility parameter is proportional to verify the reliability of an acid value of this parameter, thus deriving the acid number for the alkyd resin is an important parameter, and compared to the other parameters easily measured, it is a convenient way. molecular weight and molecular weight distribution of the polymer gel chromatograph while there were other classification methods have a great advantage, but it gets the level component not less of each fraction other performance aspects of this paper, using traditional precipitation fractionation method fraction to prepare a series of coating films to study the drying time and other relevant indicators of alcohol acid resin, the drying time of the sample is substantially determined by the smaller molecular weight components. Therefore, an alkyd resin, although conversion type resin, and other resins, as the molecular weight distribution is still an important indicator.

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