A kind of halogen-free flame retardant polycarbonate alloy resistant to alternating heat and cold and preparation method thereof

Abstract

The invention discloses a halogen-free flame retardant polycarbonate alloy resistant to alternating cold and heat and a preparation method thereof; the alloy comprises: 50-80 parts of polycarbonate, and 10-10 parts of polysiloxane-polycarbonate copolymer 40 parts, 2-15 parts of modified polyurethane, 0.1-3 parts of flame retardant, 2-10 parts of toughening agent, 0.5-1 part of anti-drip agent, 0.3-2 parts of antioxidant, 0.2-0.5 part of lubricant , 0.2‑1 part of UV absorber. The alloy has excellent flame retardant properties, and the flame retardant level of the 1.6mm thickness spline reaches the UL94‑V0 level. At the same time, polysiloxane-polycarbonate copolymer and modified polyurethane are added to the conventional polycarbonate raw materials, which not only ensures good processing fluidity, but also helps to reduce the internal stress of the material and improve the material's performance under alternating cold and heat conditions. It can be used in construction, industry, electronic and electrical and other occasions with high requirements for cold resistance, heat resistance and flame retardant, and has a wide range of 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 polycarbonate products with halogenated flame retardants. When the materials are heated, a large amount of smoke and toxic corrosive hydrogen halide gas will be generated...

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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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