Halogen-free flame-retardant polycarbonate alloy resistant to cold and hot alternation and preparation method thereof

Abstract

The invention discloses a halogen-free flame-retardant polycarbonate alloy resistant to cold and hot alternation and a preparation method thereof. The halogen-free flame-retardant polycarbonate alloyis prepared from 50 to 80 parts of polycarbonate, 10 to 40 parts of a polysiloxane-polycarbonate copolymer, 2 to 15 parts of a modified polyurethane, 0.1 to 3 parts of a flame retardant, 2 to 10 partsof a toughening agent, 0.5 to 1 part of an anti-dripping agent, 0.3 to 2 parts of an antioxidant, 0.2 to 0.5 part of a lubricating agent and 0.2 to 1 part of an ultraviolet absorbent. The halogen-free flame-retardant polycarbonate alloy has excellent flame retardant property, and the flame retardant level of a sample strip with the thickness of 1.6 mm reaches the UL94-V0 level. Meanwhile, the polysiloxane-polycarbonate copolymer and the modified polyurethane are added into conventional polycarbonate raw materials; while good processing fluidity is guaranteed, the internal stress of the material is reduced, the impact performance of the material under the cold and hot alternating condition is improved, and the material can be applied to occasions with high requirements on cold resistance,heat resistance and flame retardance in the construction industry, the industry, electronics, electrics and the like, and has wide market application prospects.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a halogen-free flame-retardant polycarbonate alloy resistant to alternating cold and heat and a preparation method thereof. Background technique [0002] Polycarbonate is a general-purpose engineering plastic with excellent performance. It is widely used in automobiles, electronics, home appliances and other fields due to its excellent impact performance and heat resistance. At the same time, in order to meet more application needs, the application of modified polycarbonate is more and more recognized by people, and products such as weather-resistant polycarbonate and flame-retardant polycarbonate have further broadened the application of polycarbonate. Among them, halogen-containing flame retardants are used in halogenated flame retardant polycarbonate products. When the material is heated, a large amount of smoke and toxic and corrosive hydrogen halide gas will be generated, wh...

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Problems solved by technology

Among them, halogenated flame retardant polycarbonate products use halogen-containing flame retardants. When the material is heated, it will produce a large amount of smoke and toxic corrosive hydrogen halide gas, which is likely to cause secondary hazards and cause serious pollution to the environment. Therefore, there is no The development of halogen flame retardant products has attracted more and more attention

In addition, because the molecular weight of polycarbonate is generally large and the molecular chain rigidity is large, the processing fluidity is poor, and stress cracking is prone to occur during use, and due to the non-crystalline nature of polycarbonate, the packing between molecules is not dense enough. , the performance will change seriously at low temperature, especially the impact performance will drop significantly, so its application is greatly restricted in the harsh environment and long-term cold and heat changes

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