Low-temperature-resistance flame-retardant photodiffusion polycarbonate composite material and preparation method thereof

Abstract

The invention discloses a low-temperature-resistance flame-retardant photodiffusion polycarbonate composite material and a preparation method thereof. The polycarbonate composite material comprises the following components in parts by weight: 400-900 parts of polycarbonate resin, 100-500 parts of organosilicone copolymer PC (polycarbonate) resin, 0.5-20 parts of sulfonate flame retardant, 1-20 parts of photo-diffusant, and 5-50 parts of an auxiliary. The preparation method comprises the following steps: uniformly mixing polycarbonate resin, organosilicone copolymer PC resin, a sulfonate flame retardant, a photo-diffusant and an auxiliary in a high-speed mixer; putting the mixture in a feed hopper of a double-screw extruder; and melting, extruding and granulating. The low-temperature-resistance flame-retardant photodiffusion polycarbonate composite material prepared by the method can fulfill high light transmittance, high haze of photodiffusion PC, various processing requirements and mechanical performance, has high flame retardance and excellent low temperature performance, and can be applied to various transparent products in the optical field, in particular applicable to products applied in a rigorous environment.

Description

technical field [0001] The invention relates to the technical field of polycarbonate composite materials, in particular to a low-temperature-resistant flame-retardant light-diffusing polycarbonate composite material and a preparation method thereof. Background technique [0002] At present, the whole society is advocating low-carbon, environmental protection, and energy saving. LED lights will gradually replace incandescent and fluorescent lights due to their power-saving features, but the light emitted by the lamp beads is too strong, which is easy to damage the eyes. Therefore, there is an urgent need for a light-diffusing lampshade to hide lamp erosion and ensure high brightness. Polycarbonate (PC) is a thermoplastic engineering plastic with superior comprehensive performance. It is widely used in Electric lighting and other fields. Therefore, LED light-diffusing lampshades tend to use light-diffusing polycarbonate (PC) resin, which is the future development trend. [...

AI Technical Summary

Problems solved by technology

Although polycarbonate resin has a certain flame retardancy, it is only UL94V-2. Ordinary light-diffusing PC cannot meet the flame-retardant requirements of thinner optical products, so its flame-retardant performance needs to be further improved

At present, there have been many studies on improving the flame retardant level by adding flame retardants to light-diffusing PC, but the addition of most types of flame retardants sacrifices the high light transmission of light-diffusing PC while improving flame retardancy. High rate, high haze characteristics, the application is greatly restricted

[0004] In addition, due to the non-crystalline nature of polycarbonate, the packing between molecules is not dense enough. Under low temperature conditions, the mechanical properties change and the impact resistance decreases, which cannot meet the application requirements of light diffusion PC in low temperature environments.

Although some studies have improved the low-temperature performance of polycarbonate at -30°C to -40°C by adding impact modifiers, it has greatly weakened the transmittance and haze of light-diffusing PC, which has limited its application.