Transparent halogen-free low smoke antiflaming polycarbonate composite material and preparation method thereof

Abstract

The invention discloses a transparent halogen-free low smoke antiflaming polycarbonate composite material and a preparation method thereof. The polycarbonate composite material comprises the following components in parts by weight: 900-980 parts of polycarbonate resin, 5-50 parts of polysiloxane fire retardant, 1-10 parts of sulfonate fire retardant, and 5-50 parts of additive. The preparation method comprises the following steps of mixing the polycarbonate resin, polysiloxane fire retardant, sulfonate fire retardant and additive in a highly mixing machine, then pelletizing through twin screw extrusion, drying and injection molding so as to obtain the transparent halogen-free low smoke antiflaming polycarbonate composite material. On one hand, the hazard that bromine antiflaming polycarbonate material generates carcinogen such as 4-bromo-dibenzdioxan and 4-bromo-dibenzofuran is avoided; on the other hand, the transparent halogen-free low smoke antiflaming polycarbonate composite material has excellent antiflaming performance, reaches the US standard of UL94V-0, also has high grade of transparency and excellent mechanical property, thermal property, low temperature performance and low smoke performance, and remarkably improves the processibility of the material.

Description

technical field [0001] The invention relates to the technical field of polycarbonate composite materials, in particular to a transparent halogen-free low-smoke flame-retardant polycarbonate composite material and a preparation method thereof. Background technique [0002] Polycarbonate (PC) is a kind of thermoplastic engineering plastic with excellent comprehensive properties. Because of its excellent weather resistance, high impact resistance and excellent electrical insulation, it is widely used in the automotive industry, instrumentation, electronic appliances and other fields. However, unmodified polycarbonate still has deficiencies, which are manifested in insufficient flame retardancy, and cannot meet the occasions with high or very high requirements for flame retardancy. Polycarbonate has been modified to overcome the disadvantages mentioned above. At present, there have been many studies on improving the flame retardant level of materials by adding flame retardants ...

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Problems solved by technology

Among them, brominated flame-retardant polycarbonate materials produce carcinogenic hazards such as tetrabromodibenzodioxane and tetrabromodibenzofuran in the process of combustion and pyrolysis; although phosphate flame-retardant materials avoid brominated flame-retardant Hazardous substances produced during the combustion process of the system, but its low melting point and high volatility can easily cause a sharp drop in the heat resistance of the PC composite material and volatilization loss during the molding process. In addition, it also sacrifices the transparency of the PC material itself; Salt flame retardants are widely used because of their small addition, high efficiency, and ability to maintain the transparency of PC materials, but they cannot meet higher flame retardant requirements when used alone, such as flame retardant requirements for thin-walled parts; Siloxane flame retardants have been researched for their excellent processability, certain flame retardancy, good mechanical properties (especially high and low temperature impact properties), and especially environmental friendliness (low smoke, low CO generation). Attention, but using it alone as a flame retardant for PC materials has disadvantages such as large amount of addition, poor flame retardant effect, and influence on transparency.

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