A halogen-free flame retardant PC composition and its preparation method

Abstract

The invention relates to a halogen-free flame retardant PC (poly carbonate) composition. The halogen-free flame retardant PC composition comprises the following components in percentage by weight: 68-87.5% of PC resin, 10-20% of styrene-acrylonitrile-N-phenyl maleic imide-cyclopentene copolymer, 1-5% of phosphorus based flame retardant, 1-5% of SMA (styrene maleic anhydride) random copolymer, 0.5-1.0% of antioxidant and 0-1.0% of lubricating agent. The halogen-free flame retardant PC composition provided by the invention fully achieves phosphorus-nitrogen synergistic flame retardant effect, flame retardant performance of a PC material is improved, addition amount of phosphate ester flame retardant is greatly reduced, the defect that heat resistance of the traditional phosphorus flame retardant PC resin is poor is overcome, and the obtained halogen-free flame retardant PC composition has excellent flame retardant property, high thermal deformation temperature, good comprehensive mechanical property and moderate cost.

Description

technical field [0001] The invention relates to the field of polymer modification, in particular to a halogen-free flame-retardant PC composition. Background technique [0002] PC is a kind of thermoplastic engineering plastic with excellent comprehensive performance, which has outstanding impact resistance, transparency, dimensional stability, excellent mechanical properties and electrical insulation properties, wide service temperature range (-40~120 ° C), good Excellent creep resistance, weather resistance and self-extinguishing properties, so it has a wide range of applications in electronics, electrical, automotive, construction, packaging, lighting and other fields. PC material has a high char formation rate when it burns, and it can self-extinguish. The flame retardant grade is UL94V-2. Compared with ordinary thermoplastics, although it has better flame retardancy, it is still flammable and has hot melt when burning. Dropping, it is easy to cause nearby materials to ...

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Problems solved by technology

However, due to the complex structure of phosphorus-nitrogen flame retardant monomers, the high price, and the relatively complicated synthesis process, most of them are concentrated in the laboratory synthesis stage, and have not yet been introduced to the market on a large scale.

[0004] Styrene-acrylonitrile-N-phenylmaleimide-cycloolefin copolymer is a new type of SAN resin. Compared with general-purpose SAN resin, the molecular structure of N-substituted maleimide and cycloolefin With a ring structure, the polymer molecular chain formed is very rigid, and the benzene ring on the N substituent on the molecular chain plays a role in increasing the steric hindrance of the molecular chain movement, thereby increasing the glass transition temperature of the polymer , endow the resin with high heat resistance and moderate flow performance, usually used as a heat resistance modifier, because of the nitrogen element in the chemical structure, it is expected to become a polycarbonate functional flame retardant modifier, styrene-acrylonitrile- Application of N-phenylmaleimide-cycloolefin copolymer to PC to improve its flame retardancy has not been reported

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