중합공정 변수가 Pre-polymer의 점도와 NCO에 미치는 영향평가

Abstract

In modern society, the efforts to improve the living standard and preserve the environment are being increased more than the effort to develop the society. Gypsum cast used in the past had a lot of defect such as heavy weight and secondary infection induced by bad ventilation. So, nowadays, to solve these problems, casting tape produced by pre-polymer resin was developed. Since casting tape has light weight and good ventilation, it replaced gypsum cast as material for cast rapidly. Until now, previously study about pre-polymerization for production of casting tape has been carried out to find good chemical composition. But, actually, different applied to pre-polymerization. So, it is necessary to perform the optimization of parameters for pre-polymerization. So, this study carried out the total of twenty-seven experiment to check the influence of the all factors. Such as water temperature of heating polymerization furnace, working time in the peak of condition, impeller rotating speed, impeller shape. And then, the result showed that impeller shape have heavily affected the NCO, and also water temperature have fairly affected the residual NCO. moreover, in the polyurethane polymerization process, the prepolymer experiment took total reaction to maintain over one hear according to water and thermometry experiment of pre-polymer checked value. Both of factors were satisfactory heating water temperature (100℃), working time in the peak of condition (2hour), impeller rotating speed (330rpm), impeller shape (a type).