Halogen-free swelling flame-retardant system containing benzoxazine charcoal forming agent and flame-retardant thermoplastic resin of halogen-free swelling flame-retardant system

Abstract

The invention relates to a halogen-free swelling flame-retardant system containing a benzoxazine charcoal forming agent and flame-retardant thermoplastic resin of the halogen-free swelling flame-retardant system. The halogen-free swelling flame-retardant system is prepared from the following raw materials in percentage by weight: 40%-95% of a phosphorus-nitrogen flame retardant, 2%-50% of the benzoxazine charcoal forming agent, 0-30% of a nitrogen-containing compound and 0-15% of a synergist, wherein the benzoxazine charcoal forming agent is one or more of single-oxazine-ring benzoxazine, bisphenol benzoxazine or diamine double-oxazine-ring benzoxazine. By virtue of the benzoxazine charcoal forming agent in the flame-retardant system, the dispersion of the added flame-retardant system in apolymer base material is promoted, the separation and migration of small-molecular flame-retardant components are inhibited, more stable charcoal layers can be generated in the combustion process, and the thermal insulation and the oxygen insulation are realized, so that the flame-retardant system has relatively high flame-retardant efficiency. Besides, a proper amount of silane structures are introduced into benzoxazine molecules, so that the flame-retardant system has the phosphorus-nitrogen-silicon ternary synergetic flame-retardant effect and can play a role of a silane coupling agent, and the comprehensive performance of a composite material is further improved.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a halogen-free expansion flame-retardant system containing a benzoxazine char-forming agent and a flame-retardant thermoplastic resin thereof. Background technique [0002] Thermoplastic resins account for about 90% of the world's total synthetic resins, commonly used are polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), polymethyl methacrylate ( PMMA), polyoxymethylene (POM), polyamide (PA), polyphenylene oxide (PPO), polyester, etc. Thermoplastic resins can be softened by repeated heating and solidified by cooling. They have good characteristics of being recyclable, reusable, and non-polluting to the environment. They are in line with the current development direction of green and environment-friendly materials. They are easy to process and mold, and have a wide range of applications. However, most thermoplastic resins have poor heat resistance, ...

AI Technical Summary

Problems solved by technology

The benzoxazine-based char-forming agent used in the flame retardant system can undergo ring-opening polymerization of its oxazine ring during melt blending processing, cross-linking to form macromolecular segments with better compatibility with the matrix, and char-forming properties. It is also better, and has a good synergistic effect with phosphate ester / salt, nitrogen-containing compounds, etc., and improves the flame retardant efficiency. The defect of poor capacity

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