Polycarbonate composition and preparation method thereof

Abstract

The invention provides a polycarbonate composition and a preparation method thereof. The polycarbonate composition comprises 100 parts of polycarbonate, 1-30 parts of phosphate flame retardants, 0.01-0.5 parts of arylsulphonate flame retardants, 0.05-0.35 parts of organosilicon flame retardants, 0.05-5 parts of anti-dripping agents, 0.05-5 parts of antioxidants and 0.05-5 parts of lubricants by mass. The preparation method comprises the following steps: weighing the components of the composition; throwing certain amount of white mineral oil and the weighed polycarbonate into a mixer to be uniformly mixed; throwing the weighed phosphate flame retardants, the arylsulphonate flame retardants, the organosilicon flame retardants, the anti-dripping agents, the antioxidants and the lubricants into the mixer to be uniformly mixed with the mixture of the white mineral oil and the polycarbonate; and melting, mixing, extruding and pelleting the mixed raw materials by a double-screw extruder in eight zones.

Description

technical field [0001] The invention relates to a polycarbonate (PC) composition and a preparation method thereof, in particular to a flame-retardant and environment-friendly polycarbonate composition suitable for film parts and a preparation method thereof. Background technique [0002] Polycarbonate plastic has the advantages of high transparency, good conventional mechanical properties such as unnotched impact strength at room temperature, heat resistance, creep resistance and flame retardancy, so it is widely used in the preparation of electronic appliances and other fields. Film, sheet, etc. In recent years, due to safety considerations, electrical insulating films used in the electronics field are required not only to have excellent mechanical, heat-resistant and electrical properties, but also to have excellent flame retardancy. In order to make polycarbonate plastic materials meet the requirements of flame retardancy when applied to films and sheets, it is necessary...

AI Technical Summary

Problems solved by technology

[0005] First, halogen (bromine and chlorine) flame retardants will produce harmful substances during combustion, which does not meet environmental protection requirements

[0006] Second, use a single flame retardant saturated addition amount (this type of flame retardant additive has a saturated concentration in the base material PC) or a conventional addition amount (this type of flame retardant additive does not have a saturated concentration in the base material PC, but its flame retardant The effect of flame modification is only significant in a certain concentration range), and it cannot meet the application requirements of flame retardant V-0 (UL94 standard test) membrane materials with a thickness of less than 0.25mm

However, in these U.S. patents, although the flame retardant modification effect of the flame retardant is good and the addition amount is small, there is a problem of saturated addition amount, and it is impossible to further achieve the flame retardant polycarbonate plastic material with a thickness of less than 0.25 mm. Combustion V-0 level (UL94 standard test) requirements

[0007] Third, add other flame retardants (such as phosphorus-based flame retardants) that are different from the above categories separately. To achieve flame-retardant V-0 level (UL94 standard test) with a thickness of less than 0.25mm, a large amount of addition is required , at this time, the mechanical properties, thermal stability and electrical properties of PC plastic materials will be reduced, especially its impact properties and heat resistance will be greatly reduced

However, the addition of such flame retardants is relatively large, the cost is high, and the impact performance of the material is greatly reduced, and it still cannot meet the application requirements of flame-retardant V-0 (UL94 standard test) membrane materials with a thickness of less than 0.25mm.

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