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METHOD FOR MEASURING CONTENTS OF SCRAP IN POLYPROPYLENE COPOLYMER BY USING ANALYSIS TECHNIQUE OF HALF CRYSTALLIZATION TIME
METHOD FOR MEASURING CONTENTS OF SCRAP IN POLYPROPYLENE COPOLYMER BY USING ANALYSIS TECHNIQUE OF HALF CRYSTALLIZATION TIME
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机译：半结晶时间分析技术测定聚丙烯共聚物中渣含量的方法
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摘要
A method for measuring a scrap content of a plastic product using a half crystallization time is provided to prevent degeneration of physical properties and quality lowering of the product caused by excessive use of the scrap during a preparation of the plastic product in advance. A method for measuring a scrap content of a polypropylene copolymer comprises the steps of: (a) respectively preparing a virgin molded article sample of a polypropylene copolymer including ethylene and a molded article sample including scrap of the polypropylene copolymer; (b) measuring a degree of crystallinity and a half crystallization time of the virgin molded article and the molded article sample including the scrap, respectively through an isothermal crystallization test; (c) substituting values measured from the step(b) for an equation 1 of a log[-ln(1-Xt)]=logK+nlogt(wherein Xt is a measured degree of crystallinity, n is an avrami constant of 3.48, t is a measured half crystallization time, and K is a total crystallization rate constant) to calculate the K; (d) inducing a linear function from the K calculated by each contents of the scrap; and (e) after measuring a degree of crystallinity and a half crystallization time of a sample, of which scrap content is unknown, to calculate a total crystallization rate constant K, calculating the scrap content by substituting the K for the induced linear function.
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