Bi-phosphorous flame-retardant copolymer nylon and preparation method thereof

Abstract

The invention discloses bi-phosphorous flame-retardant copolymer nylon and a preparation method thereof. The nylon is characterized in that a midbody which is synthesized by diamine of phosphine oxide category and dibasic alcohol of phosphine oxide category, namely bi-phosphorous organophosphoryl ammonium salt, is adopted, and the bi-phosphorous flame-retardant copolymer nylon is prepared through copolymerization between the bi-phosphorous organophosphoryl ammonium salt and polyamide 66 salt. The bi-phosphorous flame-retardant copolymer nylon is an amorphous glass form polymer in milk white, the melting range is between 255 DEG C to 275 DEG C, and the relative viscosity is 2.60-2.90; the total phosphorus content of the bi-phosphorous flame-retardant copolymer nylon ranges from 0.6% to 0.8%, the flame retardation level is grade UL-94V-0, the tensile strength is not lower than 75.0 Mpa, and the elongation at break ranges from 54.5% to 60.0%. The bi-phosphorous flame-retardant copolymer nylon has the advantages being halogen-free flame retardant, high in viscosity, free of molten drops and high in mechanical strength, and the nylon can be widely applied to the fields of fibers and textile.

Description

technical field [0001] The invention belongs to polyamide and its preparation. It relates to a double phosphorus flame-retardant copolymerized nylon and a preparation method thereof. The present invention adopts the intermediate bisphosphorus organic phosphine ammonium salt synthesized by phosphine oxide diamine and phosphine oxide diol, and copolymerizes with nylon 66 salt to prepare biphosphorus flame retardant copolymerized nylon, and the prepared bisphosphorus flame retardant copolymerized nylon It has the characteristics of halogen-free flame retardancy, high viscosity, no droplet and high mechanical strength, and can be widely used in fiber and textile fields. Background technique [0002] Polyamide (Polyamide, commonly known as nylon) material has a wide range of uses due to its outstanding mechanical properties, mechanical properties, electrical properties, wear resistance, oil resistance, chemical resistance, etc., and is commonly used in automobiles, transportatio...

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Problems solved by technology

Chinese patent (publication number CN1266445A) discloses "polymer-bonded non-halogen flame retardant composition", which adopts reactive flame retardant (CEPPA) and nylon 66 monomer to copolymerize to obtain flame retardant nylon 66 polymer, The introduction of flame retardant molecules into the polymer molecular chain keeps the flame retardant performance of the polymer for a long time. However, during the polymerization and processing of nylon 66, the problem of decomposition of the flame retardant due to excessive temperature has not been solved. This affects the flame retardancy and mechanical properties of flame retardant nylon 66

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