High-fluidity polycarbonate alloy and preparation method thereof

Abstract

The invention discloses a high-fluidity polycarbonate alloy and a preparation method thereof. The polycarbonate alloy is prepared through the step that low molecular weight fluoro polyolefin which has specific content and is within specific molecular weight is added in a polycarbonate combination composed of polycarbonate, styrene-butadiene copolymers, flexibilizer, flame retardant and other auxiliaries; on the condition that other properties such as flame retardance, a thermal property and a mechanical property of the material of the combination are not changed, the fluidity of the material can be greatly improved, when the production time is prolonged, the improvement of fluidity is more obvious, and the high-fluidity polycarbonate alloy is suitable for occasions high in use environment requirement.

Description

technical field [0001] The invention relates to a polycarbonate alloy and a preparation method thereof, in particular to a high fluidity polycarbonate alloy and a preparation method thereof, and belongs to the technical field of polymer composite material engineering plastics. Background technique [0002] In order to improve the shortcomings of polycarbonate (PC) such as poor processability, rubber modified polymers can usually be added to it. Most of the rubber modified polymers are mainly butadiene copolymers, especially PC and acrylonitrile- The PC / ABS alloy with butadiene-styrene graft copolymer (ABS) as the main raw material is an important improvement direction. On the one hand, it can improve the heat resistance and tensile strength of ABS, and on the other hand, it can reduce the Melt viscosity, improve processing performance, reduce product internal stress and impact strength sensitivity to product thickness. [0003] In PC / ABS alloys, bisphenol A-phenyl phosphate...

AI Technical Summary

Problems solved by technology

In recent years, electronic or electrical products have been developing towards thinner and larger products, so it is necessary to further improve the fluidity of PC / ABS, but using low molecular weight polycarbonate or increasing the amount of ABS or BDP will bring toughness Lower and other bad defects

[0004] There is prior art to disclose a kind of method of high flow polycarbonate composition, in it, a large amount of adding pentaerythritol monostearate is used as flow modifier, while improving the melt index of polycarbonate composition, can not Avoid reducing the impact strength and heat resistance of the material, and adding a large amount of this lubricant has the risk of precipitation

[0005] Also prior art discloses a method for modifying polycarbonate compositions with high fluidity, using cyclooligobutylene terephthalate (CBT) in it, and similarly, improving polycarbonate The melt index of the composition reduces the toughness and heat resistance of the material. In addition, when used for a long time, CBT will react with PC, and the performance will drop sharply, which limits the use of this material.

[0006] None of the above existing technologies can provide good fluidity on the basis of ensuring the original properties of PC materials such as flame retardancy and toughness.

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