Polyurethane useful for orthopedics external fixing system in complex environment and preparation method thereof

摘要

A polyurethane used for orthopedics external fixing system in complex environment is obtained by reaction of mixture of polyether polyol with modified isocyanate in the weight ratio of 1:0.6-0.75. The modified isocyanate is obtained by reaction of polyphenylene polymethylene isocyanate with polyether glycol. The components and corresponding weight percent amounts of the mixture of polyether polyol are as follows: 60-65% polyether polyol; 0.3-1% catalyst; 0.1-2% foam stabilizer; 0.1-2% or 3-20% foaming agent; 25-40% filler and 0.5-2% functional auxiliary agent. The method of producing the polyurethane is also provided.

主权项

1. A polyurethane for an external fixation system for orthopedics, the polyurethane being a polyether polyurethane prepared by a polymerization reaction using a polyether polyol mixture and a modified isocyanate as raw materials, the polyether polyol mixture comprising a polyether polyol, the polyether polyol comprising hydroxyl groups, the modified isocyanate comprising isocyanate groups at terminals of a molecular chain of the modified isocyanate, and the polymerization reaction being a reaction between the hydroxyl groups and the isocyanate groups to form urethane groups,wherein
the polyether polyol mixture and the modified isocyanate as raw materials in the polymerization reaction have a weight ratio of 1:0.6-1:0.75; the polyether polyol mixture comprises ingredients in the following weight percentages with respect to the polyether polyol mixture:the polyether polyol60-65 wt. %, a catalyst0.3-1 wt. %,a foam stabilizer0.1-2 wt. %,a foaming agent0.1-2 wt. % or 3-20 wt. %,a filler  25-40 wt. %, anda functional additive0.5-2 wt. %; wherein the polyether polyol is selected from the following compounds:
a) a first polyether polyol represented by a formula of wherein a1, a2, a3, a4, a5, and a6 are integers, and a sum of a1, a2, a3, a4, a5, and a6 is from 7 to 15;b) a second polyether polyol represented by a formula of wherein b1, b2, b3, b4, b5, b6, b7, and b8 are integers, and a sum of b1, b2, b3, b4, b5, b6, b7, and b8 is from 7 to 15;c) a third polyether polyol represented by a formula of wherein c1, c2, c3, and c4 are integers, and a sum of c1, c2, c3, and c4 is from 7 to 15; ord) a mixture of two or three compounds selected from the group consisting of the first polyether polyol, the second polyether polyol, and the third polyether polyol; and the modified isocyanate is prepared from polymerization reaction of polyether glycol with diphenylmethane diisocyanate (MDI) or with a polyphenylene polymethylene isocyanate.