Method for preparing high-toughness thermoplastic fluorine-containing polyurethane elastomer
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A polyurethane elastomer and thermoplastic technology, used in the field of polymer synthesis, can solve the problems of low molecular weight of the final polymer, low activity of fluorine-containing monomers, and low mechanical properties.
Active Publication Date: 2010-06-02
SICHUAN UNIV
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[0003] At present, fluorine-containing thermoplastic polyurethanes are mainly used as biomedical materials. Due to the low activity...
Method used
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Embodiment 1
[0028] Weigh 4 kg of hydroxyl-terminated polyethylene adipate (PEA, molecular weight 2000) and polyfluorinated glycidyl ether glycol (PFGE, molecular weight 2000) 4 kg in the reactor, with a mass ratio of 50 / 50, at 120 ° C Vacuum dehydration for 2 hours, lower the temperature to 80°C, add 1.726 kg of 4,4'-diphenylmethane diisocyanate (MDI), stir for 3 hours, raise the temperature to 140°C, add 1,4-butanediol (BDO) chain extender 0.274kg, stirred evenly, poured into a preheated container, and vacuum baked at 140°C for 20 hours to obtain the product.
Embodiment 2
[0030] Weigh 2.1 kg of hydroxyl-terminated polycaprolactone (PCL, molecular weight 2000) and 4.9 kg of polyfluorinated glycidyl ether glycol (PFGE, molecular weight 1000) in the reactor, with a mass ratio of 30 / 70, and vacuum dehydrate at 120 °C 2h, cool down to 70°C, add 2.498kg of 4,4'-diphenylmethane diisocyanate (MDI), stir for 3h, heat up to 140°C, add 0.502kg of 1,6-hexanediol (HG) chain extender , stirred evenly, poured into a preheated container, and vacuum baked at 140°C for 20 hours to obtain the product.
Embodiment 3
[0032] Weigh 6 kg of polytetramethylene ether glycol (PTHF, molecular weight 2000) in the reactor, vacuum dehydrate at 120 ° C for 2 h, cool down to 90 ° C, add 1.686 kg of toluene diisocyanate (TDI), stir for 3 h, and heat up to At 130°C, add 2.314 kg of hexafluorobisphenol A chain extender, stir evenly, pour it into a preheated container, and vacuum bake at 130°C for 20 hours to obtain the product.
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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...
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