Polycarbonate/polyethylene terephthalate resin composition and preparation method

Abstract

The invention relates to a polycarbonate / polyethylene terephthalate resin composition and a preparation method, the composition comprises the following components by weight percent (wt%): 60-75% of waste polycarbonate resin (PC), 20-30% of waste polyethylene terephthalate (PET), 4-15% of impact modifier, 0.5-1.5% of chain extender and 0.1-1.5% of processing aids, the chain extender is used for carrying out chain extension and granulation on the waste PC and the waste PET, then the PC and the PET after the chain extension, the impact modifier and the processing aids are pre-mixed in a high-speed mixer and then melted and extruded through a twin-screw extruder, and cooling and granulation are finally carried out for obtaining a product. The preparation process is reasonable, the chain extension is carried out on the waste PC material and the waste PET material, and then the alloying technology is further used for modification, thereby having excellent performances and simultaneously having short production cycle and low cost; furthermore, the whole process is more environment-friendly and has better economic benefits and social benefits.

Description

technical field [0001] The invention relates to a polymer resin composition and a preparation method, in particular to a polycarbonate / polyethylene terephthalate resin composition and a preparation method. Background technique [0002] PET (polyethylene terephthalate) resin is widely used to produce PET bottles, PET films and the like. With the improvement of human living standards, these PET bottles and PET films are used in large quantities and discarded after use, thereby causing serious environmental pollution. From the perspective of energy saving and environmental protection, developed countries such as Europe and the United States have carried out a lot of research and development on the recycling of PET resin, and domestic research and development in this area have also begun in recent years. There are many ways to recycle PET. 1) By alcoholysis, hydrolysis, acidolysis and other methods, PET waste resin is cracked into low-molecular compounds, which are used as poly...

AI Technical Summary

Problems solved by technology

[0004] It can be seen from some of the above schemes that 1) the materials can be made more pure through alcoholysis, hydrolysis, acidolysis and other pyrolysis methods, but there is a large cost investment, and a large amount of waste such as solvents generated during the pyrolysis process will still be discharged. Seriously pollute the environment, and the economic benefits are not high; 2) It is more environmentally friendly to use through direct crushing, but the material performance cannot be guaranteed well, which affects later use, and can only be used for low-end products, and the economic benefits are not good; 3) Through crushing Simple modifications such as chain extension and enhancement also have mediocre product performance and can only be used in some low-end fields with low added value

4) Selective dissolution and purification, this scheme also has a large amount of waste discharge, and there will be a certain molecular weight reduction during the purification process, which will affect its later use