N-P synergetic flame retardant nylon 66 and preparation method thereof

Abstract

The invention discloses N-P synergetic flame retardant nylon 66 and a preparation method thereof. The N-P synergetic flame retardant nylon 66 is characterized in that a derivative of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide react with diamine to prepare a flame retardant A containing P; a binary acid melamine salt and a cyanuric acid diamine salt which are equal in molar mass are mixed to prepare a flame retardant B containing N; the flame retardant A and the flame retardant B react with a nylon 66 salt to prepare the N-P synergetic flame retardant nylon 66, wherein the flame retardant A and the nylon 66 are subjected to copolymerization, and the flame retardant B and the nylon 66 are subjected to in-situ polymerization. The N-P synergetic flame retardant nylon 66 has a melting point range of 255-265 DEG C, a relative viscosity range of 2.0-3.0, a flame retardant rating of V0, tensile strength of 70.0-82.0 MPa, notch impact strength of 3.5-5.0 KJ / m<2>, bending strength of 100-120 MPa and smoke density of 10-15%. The N-P synergetic flame retardant nylon 66 can be used for spinning and manufacture of engineering plastics.

Description

technical field [0001] The invention belongs to organic polymer polyamide and its preparation, and relates to N-P synergistic flame-retardant nylon 66 and its preparation method. The N-P synergistic flame-retardant nylon 66 of the present invention is especially suitable for spinning and used as engineering plastics. Background technique [0002] At present, the flame retardancy of nylon is realized in two ways: (1) by mechanical blending and using additive flame retardant, adding it to nylon to realize the flame retardancy function. (2) Using a reactive flame retardant, grafted into the nylon macromolecular chain through chemical synthesis, the grafting method can also be divided into the main chain or side chain of nylon, which can make the nylon material itself have a flame retardant component With the corresponding flame retardant function, a certain permanent flame retardant effect can be achieved. Using this method, the preparation of flame-retardant nylon fibers and...

AI Technical Summary

Problems solved by technology

Chinese patent (publication numbers CN104211954A and CN105153415A) adopts reactive flame retardant DOPO (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) derivatives to copolymerize with nylon 66 monomer To obtain the flame retardant nylon 66 polymer, the flame retardant molecule is introduced into the polymer molecular chain, so that the flame retardant performance of the polymer is maintained for a long time, but the P series flame retardant used in the invention will make the flame retardant nylon anti-melt Less dripping effect and higher smoke density

Thus, a nylon resin with better flame-retardant durability is obtained, but the N series flame retardant used in this invention needs to be added in a large amount, which also affects the mechanical properties of the resin itself.

Therefore, the mechanical properties of flame-retardant nylon 66 in the prior art are only: tensile strength 55-65MPa, notched impact strength 2.8-3.4KJ / m 2 , Bending strength 95 ~ 105MPa, poor performance

[0003] In the present invention, the N-containing flame retardant and the P-containing flame retardant are polymerized together with nylon 66 salt to prepare N-P synergistic flame-retardant nylon 66 with excellent flame retardancy and mechanical properties. At present, there is no report on this method in any relevant literature.

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