Polycarbonate composite material and preparation method thereof and method for manufacturing LED (Light Emitting Diode) lamp housing

Abstract

The invention discloses a polycarbonate (PC) composite material and a preparation method thereof and a method for manufacturing an LED (Light Emitting Diode) lamp housing. The composite material is prepared from the following components in percentage by weight: 84-98.59 percent of polycarbonate resin, 0.01-8 percent of light diffusant, 1-5 percent of silicone resin, 0.1-1 percent of processing agent, 0.1-1 percent of thermal stabilizer, 0.1-1 percent of light stabilizer and 0.1-1 percent of processing aid. In the invention, the light diffusant is processed by using epoxy resin, so that the interfacial bond of the light diffusant and polycarbonate is improved, and the solvent-stress-resistant cracking performance of the PC composite material is decreased. Ordered arrangement of polycarbonate molecules is increased and the internal stress is reduced under optimized injection mould temperature; and the minimum influence of a toughening component on the transparency of a final lamp housing product is guaranteed by adding the silicone resin with refractive index of 1.587 and toughening effect. The reduction in impact strength of the lamp housing product brought by higher mould temperature during injection molding can be compensated by adding the silicone resin. The light diffusion PC material with a balance among light transmittance, haze and diffusion angle is obtained by adding the light diffusant, so that an LED lamp emits non-dazzling, soft and pleasant light.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, and in particular relates to a polycarbonate composite material, its preparation technology and a method for manufacturing an LED lampshade. Background technique [0002] Polycarbonate resin, referred to as PC, is a kind of engineering plastics. As a widely used material, PC has its own characteristics and advantages and disadvantages. PC is an amorphous thermoplastic resin with excellent comprehensive performance and excellent electrical insulation. Sexuality, extensibility, dimensional stability and chemical corrosion resistance, high strength, heat resistance and cold resistance; at the same time, it also has the advantages of self-extinguishing, flame retardant, non-toxic, and colorable. [0003] However, one of the disadvantages of PC is its poor resistance to environmental stress cracking. Especially when it is mixed with thermosetting resin or cross-linked resin or inorganic pa...

AI Technical Summary

Problems solved by technology

Chinese patents CN1338488A, CN1400249A, CN1653134A, CN1556822A and Chen Zhenjia et al. (Plastic Industry, Vol. 37, Issue 8, 2009, Pages 18-21) adopted blending of PC and PBT, blending of PC and glass fiber, and blending of PC and PBT respectively. Blending with ABS and a C9 naphtha, blending of PC with ABS high rubber powder and basic aluminum oxalate and polytetrafluoroethylene, blending of PC with PET and adding GMA group compatibilizer to improve the resistance of PC Solvent and stress cracking resistance, but the above methods will lead to the complete loss of transparency of the final product, not suitable for use as a lampshade in the lighting industry

[0005] Chinese patent CN101628983A points out that the pigment is treated with a coupling agent diluted with silicone and then blended with PC to improve the stress cracking resistance of colored PC. environment, causing harm to the operator and polluting the environment

However, this heat treatment method is very easy to cause local crystallization of the PC material, so that the impact strength of the product drops sharply.