Branching, cross-linking, expanded, melt-dropping-resistant and flame-retardant copolyester based on triazine ring structure and preparation method of copolyester

Abstract

The invention discloses branching, cross-linking, expanded, melt-dropping-resistant and flame-retardant copolyester based on a triazine ring structure. The copolyester is prepared by conducting random copolymerization on structure units expressed as formulae I, II and III or structure units expressed as formulae I, II, III and IV according to a conventional method. The intrinsic viscosity [eta] of the prepared branching, cross-linking, expanded, melt-dropping-resistant and flame-retardant copolyester is 0.41-1.10 dL/g; the extreme oxygen index is 24.5-38.0%; the vertical combustion grade is between V-2 and V-0; the peak heat release rate p-HRR in a cone heat test is 247-643 kW/m<2>. According to the copolyester, a modified monomer of the triazine ring structure is introduced, and then copolymerized with polyester to form a unique ternary branched cross-linking network structure; the modified monomer of the triazine ring structure contains the flame-retardant element nitrogen, so that the melt viscosity of the copolyester in combustion can be improved; the copolyester is capable of releasing nitrogen and quickly forming an expanded char layer with excellent heat and oxygen insulation effects; especially, a phosphorus-nitrogen synergism effect can be generated when the copolyester is used together with the conventional phosphorus-containing flame-retardant agent; the flame-retardant performance and the melt-dropping-resistant effects can be more excellent; the selected monomer is low in price; the preparation process is mature; the operation is simple and convenient; the industrialized large-scale production is liable to implement.

Description

technical field [0001] The invention belongs to the technical field of anti-droplet copolyester and its preparation. Specifically, the present invention relates to a kind of copolyester with branched cross-linking, expansion flame retardancy and anti-dropping property and its preparation method. This type of copolyester can use monomers containing triazine ring structural units alone. Through its unique nitrogen-containing ring branched structure, the melt viscosity of the copolyester can be increased at high temperature, and it can be promoted to form a unique microstructure at high temperature. The expanded carbon layer of the structure can insulate heat, so that it can obtain flame retardant properties and a certain anti-droplet performance; it is also possible to use phosphorus-containing flame-retardant monomers to work together with monomers containing triazine ring structural units to form an efficient "phosphorus Nitrogen synergy" effect allows copolyester to obtain b...

AI Technical Summary

Problems solved by technology

The strong droplet phenomenon of polyester will not only cause "secondary combustion" and cause unnecessary property loss, but also cause serious burns and scalds to people in the fire scene.

Because the flame retardant of traditional flame retardant polyester is usually achieved by promoting the degradation of polyester and accelerating the melting drop to take away the heat and fire source, so there is a certain contradiction between flame retardant and anti-melting drop, how to solve and Coordinating this contradiction has always been a difficult problem in polyester flame retardant research

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