A kind of polycarbonate composition and preparation method thereof

Abstract

Disclosed are a polycarbonate composition and method for preparing same, said composition comprising the following components in parts by weight: 30-75 parts of polycarbonate; 0-35 parts of graft copolymer; 5-25 parts of fire retardant; 5-35 parts of mineral filler; on the basis of the total weight of the polycarbonate composition, the weight content of elemental potassium is 10-200 ppm. In the present invention, by means of adding to the polycarbonate composition a potassium-containing compound having a low potassium content and reducing or avoiding the addition of other potassium-containing compounds, and controlling to within a range of 10-200 ppm the content of elemental potassium in the polycarbonate composition, the resulting polycarbonate composition, after being baked at 90°C and 90% humidity for 500 h, has a resistance to heat and moisture aging that remains greater than 70%; it has significantly improved resistance to heat and moisture aging, and has a chromatic aberration value of less than 8 after being baked at 85°C for 200 h, has a color level of 3 or higher, and has excellent chromatic stability.

Description

technical field [0001] The invention relates to the technical field of engineering plastics, in particular to a polycarbonate composition and a preparation method thereof. Background technique [0002] Polycarbonate PC has high impact resistance and heat resistance. In order to improve its processing performance and the shortcomings of notch impact sensitivity, rubber modified polymers, such as ABS, MBS, etc., can usually be added, especially PC The PC / ABS alloy with ABS as the main raw material is an important engineering plastic, which can combine the excellent properties of the two to improve the physical properties and processing performance. However, due to the addition of ABS, the double bond in the system will bring long-term The hidden dangers of thermal oxygen aging performance and weather resistance performance, especially in the occasions with relatively high requirements on the use environment, the surface is prone to form defects and its color is prone to change...

AI Technical Summary

Problems solved by technology

[0002] Polycarbonate PC has high impact resistance and heat resistance. In order to improve its processing performance and the shortcomings of notch impact sensitivity, rubber modified polymers, such as ABS, MBS, etc., can usually be added, especially PC The PC / ABS alloy with ABS as the main raw material is an important engineering plastic, which can combine the excellent properties of the two to improve the physical properties and processing performance. However, due to the addition of ABS, the double bond in the system will bring long-term The hidden dangers of thermal oxygen aging performance and weather resistance performance, especially in the occasions with relatively high requirements for the use environment, the surface is prone to defects and its color is prone to change

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