Method for Preparing Macromolecular Polyoxymethylene

摘要

The present invention is concerned with the methods for preparing macromolecular polyoxymethylene (polyformaldehyde) from crystalline trioxane. A method for preparing macromolecular polyoxymethylene from polycrystalline trioxane by means of shock compression is already known. One of the drawbacks of this method is that the polyoxymethylene produced exhibits a relatively low degree of crystallinity and low molecular weight, which may cause this material to lack sufficient mechanical strength and wear resistance. Another drawback of this method is its low yield of the final product. The object of this invention is to eliminate these disadvantages. To this aim, using a method for the preparation of macromolecular polyoxymethylene in which the raw material is polymerized by shock compression, it became necessary to modify the raw material so as to obtain polyoxymethylene having higher crystallinity and molecular weight and, consequently, higher mechanical strength and greater wear resistance. According to this invention this problem is solved by using monocrystalline trioxane instead of crystalline trioxane. (ERA citation 05:008889)