Transparent halogen-free flame-retardant polycarbonate composite material and preparation method thereof

Abstract

The invention discloses a transparent halogen-free flame-retardant polycarbonate composite material and a preparation method thereof. The composite material is prepared from the following raw materials by weight: 50-80 parts of polycarbonate, 30-40 parts of a polycarbonate-polysiloxane copolymer, 0.04-0.13 part of a sulfonate flame retardant, 0.1-0.5 part of an antioxidant, 0.15-1.1 parts of a UVstabilizer and 0.2 to 1 part of a lubricant. The transparent halogen-free flame-retardant polycarbonate composite material of the invention is obtained by thoroughly mixing the above components in proportion, then performing extrusion via a twin-screw extruder, and performing granulation and preparation of a standard spline. The transparent halogen-free flame-retardant polycarbonate composite material has the characteristcis of high flame retardancy, high transparency, low temperature impact resistance, environment friendliness, etc., and is very applicable to manufacturing of solar devices, electrical junction boxes, electrical connectors, electric vehicle charger shells, outdoor electrical shells, smart meter shells, smart power grid nodes, photovoltaic frames, miniature circuit breakershells, etc.

Description

technical field [0001] The invention belongs to the technical field of polymer processing, in particular to a transparent halogen-free flame-retardant polycarbonate composite material and a preparation method thereof. Background technique [0002] Polycarbonate composite materials are widely used in the construction industry, automobile manufacturing industry, medical equipment, aerospace, optical lenses, communication media data discs, electrical lighting and other fields. Polycarbonate is a thermoplastic engineering plastic with superior comprehensive properties. It has excellent transparency, excellent electrical properties, low molding shrinkage, wide temperature range, tasteless, odorless, harmless to human body, and conforms to hygiene and safety. However, due to the non-crystalline nature of polycarbonate, the packing between molecules is not dense enough. Under low temperature or even ultra-low temperature environment, the mechanical properties of polycarbonate will ...

AI Technical Summary

Problems solved by technology

However, due to the non-crystalline nature of polycarbonate, the packing between molecules is not dense enough. Under low temperature or even ultra-low temperature environment, the mechanical properties of polycarbonate will change, the impact resistance will be reduced, and the strength will be weakened.

For many applications, the impact resistance of polycarbonate composite materials is still not enough, and the high transparency of polycarbonate material itself is more easily affected

[0003] In addition, although polycarbonate resin has certain flame retardancy, the flame retardancy level is only UL94V-2, which cannot meet the requirements for high or very high flame retardancy.

At present, there have been many studies on improving the flame retardancy level of materials by adding flame retardants to polycarbonate, but the addition of most types of flame retardants sacrifices the high flame retardancy of the material itself while maintaining high flame retardancy. Transparency limits the scope of use of the product. For example, the production of thin-walled parts such as mobile phone casings and electrical appliance casings requires high-transparency composite materials

[0004] In the patent CN103788610B, Zhao Zhigang and others proposed a high-transparency low-temperature impact-resistant flame-retardant polycarbonate composite material and its preparation method. By blending polycarbonate resin, silicone copolymerized polycarbonate, and acrylate toughener (GMA / MBS) , Flame retardant (polybromocarbonate), to achieve high transparency, flame retardant, low temperature impact resistance, but the flame retardant component is not friendly to the environment, and the flame retardant effect needs to be improved, and MBS will affect the transparency of the product