A kind of high-gloss halogen-free flame-retardant PC material and preparation method thereof

Abstract

The invention discloses a high-gloss halogen-free flame retardant PC material and a preparation method thereof. The high-gloss halogen-free flame retardant PC material is prepared from the following raw materials in percentage by mass: 91-97.1% of PC resin, 1-5% of toughening agent, 0.1-0.4% of halogen-free flame retardant, 0.5-1% of anti-dripping agent, 0.1-0.3% of main antioxidant, 0.1-0.3% of auxiliary antioxidant, 1-1.5% of black masterbatch and 0.1-0.5% of lubricant. The preparation method comprises the following steps: 1) drying the PC resin; 2) sufficiently and uniformly mixing the raw materials according to the proportion; and 3) adding the material of the step 2) into a twin-screw extruder, extruding and granulating to obtain the high-gloss halogen-free flame retardant PC material. The high-gloss halogen-free flame retardant PC material disclosed by the invention has excellent flame retardant property and good comprehensive performance and can be widely applied to the thin-wall parts such as the shells of electronic and electrical appliances; the surface of the prepared thin-wall part has high gloss without pork marks; and moreover, the preparation method disclosed by the invention is simple, the technological operation is easy to implement, the production cost is low, and industrial production is facilitated.

Description

technical field [0001] The invention relates to a high-gloss halogen-free flame-retardant PC material and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] PC (polycarbonate) is a thermoplastic engineering plastic with excellent comprehensive properties. It has excellent weather resistance, impact resistance, electrical insulation performance, and high light transmittance. It is widely used in electronic and electrical housings and other products. [0003] PC itself has certain flame retardancy, but the flame retardancy level is low, only UL94V2 level. At present, the flame retardant performance of PC materials is often improved by adding phosphorus-based flame retardants, sulfonate-based flame retardants and other halogen-free flame retardants, but there are obvious defects. Phosphorus-based flame retardants will seriously reduce the heat resistance of PC materials; although sulfonate-based flame retardants h...

AI Technical Summary

Problems solved by technology

Phosphorus-based flame retardants will seriously reduce the heat resistance of PC materials; although sulfonate-based flame retardants have the advantages of less addition and high efficiency, they cannot meet the resistance of some special products such as thin-walled parts when used alone. fuel requirements

[0004] The flame retardant level of PC thin-walled parts is generally difficult to reach the UL94V0 level. The main reason is that the material is prone to dripping during the combustion process. It is usually necessary to add an anti-dripping agent to achieve the purpose of suppressing dripping. Currently, the commonly used The anti-dripping agent is high-molecular-weight polytetrafluoroethylene pure powder or polytetrafluoroethylene coated with acrylonitrile-styrene copolymer. Due to the high molecular weight of polytetrafluoroethylene and the high melt viscosity of PC materials, although in the process The dispersion of PTFE can be improved by optimizing the production process, but there will still be poor dispersion, and pitting can be clearly seen when molding high-gloss specular black products, which will affect the appearance

Images