12-05-2010 дата публикации
Номер: CN0101704936A
Автор:
GU JINGEN,
LI HENG,
NIU YONGLIANG,
SHENG LEI,
SHU CHENGPING,
XIAN YI,
JINGEN GU,
HENG LI,
YONGLIANG NIU,
LEI SHENG,
CHENGPING SHU,
YI XIAN
Принадлежит:
The invention relates to a method for preparing polyurethane and the polyurethane. According to the method, the polyurethane is generated by reacting polybasic isocyanate with poly-polyol, and the end point of the reaction is judged by detecting the molecular weight and the molecular weight distribution of a reaction system. In the method, the molecular of the polyurethane is between 160,000 and 200,000, the molecular weight distribution is between 1.5 and 1.9, the apparent viscosity at the temperature of 25 DEG C is between 1,250 and 1,550 P, and the solid content is between 29 and 31 percent. Because the end point of the reaction is judged by monitoring the molecular weight and the molecular weight distribution of the reaction system for synthesizing the polyurethane, the method solves the problems of poor repeatability, single and apparent reaction end point control and incapability of truly reflecting the characteristics of polyurethane resin in the process of judging the end point ...
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