Method for preparing high-toughness thermoplastic fluorine-containing polyurethane elastomer

Abstract

The invention discloses a method for preparing a high-toughness thermoplastic fluorine-containing polyurethane elastomer, which is characterized in that a bulk polymerization two-step method is adopted to synthesize the fluorine-containing polyurethane elastomer, the isocyanate index is 0.98, and the hard segment content is between 20 and 40 weight percent. The method comprises the following steps of: weighing 6 to 40 parts of non-fluorine macromolecular polylol and / or 30 to 80 parts of fluorine-containing polyether diol in a reactor, performing vacuum dehydration on the mixture for 2h at thetemperature of 120 DEG C, cooling the mixture to be between 70 and 100 DEG C, adding 16 to 33 parts of polyisocyanate into the mixture, stirring the mixture to react for 3h, heating the mixture to bebetween 120 and 140 DEG C, adding 0.1 to 15 parts of low molecular (fluorine-containing) diol chain extender into the mixture, uniformly stirring the mixture, then dumping the mixture into a preheated container, and performing vacuum baking for 20 hours at the temperature of between 120 and 140 DEG C to obtain the high-toughness thermoplastic fluorine-containing polyurethane elastomer.

Description

1. Technical field [0001] The invention relates to a preparation method of a high-toughness thermoplastic fluorine-containing polyurethane elastomer, belonging to the field of polymer synthesis. 2. Background technology [0002] The fluorine element is introduced into the polyurethane molecule to obtain a fluorine-containing polyurethane material, which can make it have a series of unique properties, such as excellent resistance to ultraviolet rays and nuclear radiation, flexibility, excellent wear resistance, high tensile strength, high Resistivity and high weather resistance, etc., have good application prospects in national defense industry, paint industry, leather decoration, textile finishing, medical and health industries. In 1958, British Patent 797795 reported for the first time that fluorinated polyurethane was synthesized based on the reaction of hexafluoropentanediol and hexamethylene diisocyanate. In 1963, the Narmco Research and Development Department of the Am...

AI Technical Summary

Problems solved by technology

[0003] At present, fluorine-containing thermoplastic polyurethanes are mainly used as biomedical materials. Due to the low activity of fluorine-containing monomers, the final polymer has low molecular weight and low mechanical properties, which limits its application.

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