Flame-retardant, high-transmittance and weather-proof polycarbonate composite used for LED lampshade and preparation method

Abstract

The invention belongs to the technical field of polycarbonate composites, and particularly discloses a flame-retardant, high-transmittance and weather-proof polycarbonate composite used for an LED lampshade and a preparation method. The polycarbonate composite is prepared from raw materials including, by weight, 100 parts of polycarbonate, 0.2-0.6 part of copolymerized organic siloxane microspheres, 3-8 parts of organic nano-montmorillonite, 0.5-1 part of weather-proof agent, compatilizer and 0-2 parts of other auxiliaries. The prepared flame-retardant, high-transmittance and weather-proof polycarbonate composite has excellent chemical performance and processing performance, has the advantages of high transmittance, high flame retardance, excellent weather resistance and the like, can meet requirements of LED illumination lampshades, and is simple in process and beneficial to wide application and popularization.

Description

technical field [0001] The invention relates to the technical field of polycarbonate composite materials, in particular to a flame-retardant, highly light-transmitting and weather-resistant polycarbonate composite material for LED lampshades and a preparation method thereof. Background technique [0002] In recent years, facing the global resource crisis, the LED industry has sprung up and has been widely used in lighting, display and other industries. Due to its advantages of energy saving, environmental protection and long life, the application prospect of LED lighting is very broad. With the rapid development of LED lighting industry, the use of light diffusion materials for LED shells is increasing rapidly. , and can effectively scatter light, and can convert point and line light sources into line and surface light sources. [0003] Polycarbonate is a widely used engineering plastic, which has the characteristics of high transparency, high toughness, high heat resistanc...

AI Technical Summary

Problems solved by technology

However, when unmodified polycarbonate is used as a lampshade, its flame retardancy is low, and special flame-retardant modification is required to protect the LED lampshade, prevent the lampshade from being damaged or discolored by sunlight; at the same time, when used as an outdoor LED For lighting lamps and lanterns, the polycarbonate cover has undergone traditional flame-retardant modification, resulting in a decrease in light transmission, low luminous efficiency, and the high brightness of LED lighting cannot be utilized; finally, the polycarbonate cover is exposed to sunlight for a long time. In this case, it is very easy to cause the outer cover to age and become brittle

[0004] At present, a series of studies on this problem have been carried out at home and abroad. For example, patent CN102219989A discloses a kind of flame-retardant light-diffusing polycarbonate resin composite material for LED lamps and its preparation method. It is difficult for a single diffuser to achieve the balance of haze and light transmittance. At the same time, environmentally friendly brominated polycarbonate is used as a flame retardant and a silicone flame retardant to achieve high-efficiency flame retardancy. Effect on light transmittance The smallest effect, but there are the following disadvantages: 1) the amount of the main flame retardant is large, the impact resistance of the prepared polycarbonate resin is poor, and the product is easily broken when assembled; 2) the auxiliary flame retardant and the main flame retardant The synergistic effect of the agent cannot occur, the flame retardant efficiency is low, the impact resistance of the product is poor, and the transparency is reduced; 3) a light diffusing agent must be used, and the light transmittance of the prepared product is low, only 66-85%

U.S. Patent US20090258170A1 discloses a flame-retardant light-diffusing composition based on PC, adding an organic light-diffusing agent and a silicone flame retardant to achieve light-diffusing and flame-retardant properties, expanding the application range of the light-diffusing composition. However, its flame retardancy is low, only reaching V1 level, which cannot meet the needs of specific occasions

Patent CN101906244A discloses a PC-based flame-retardant light-diffusing PC composition, adding light-diffusing masterbatch, compounding flame-retardant with sulfonate and organic silicon, reaching V0 flame-retardant level, but without adding light stabilizer, Poor weather resistance, which limits the service life and scope of use of the product

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