High-CTI-value and high-heat-resistance polycarbonate composition and preparation method thereof

Abstract

The invention discloses a high-CTI-value and high-heat-resistance polycarbonate composition and a preparation method thereof. The high-CTI-value and high-heat-resistance polycarbonate composition is prepared from, by weight, 80-95 parts of polycarbonate, 5-20 parts of phosphate ester homopolymer, 0-8 parts of a toughening agent and 0-9.6 parts of other auxiliary agents; the sum of weight parts of all components is 100. Compared with the prior art, the phosphate ester homopolymer is added to a raw material formula, on one hand, the defect that the heat deformation temperature and tenacity of the polycarbonate are greatly lowered due to adding of organophosphate flame retardant in the prior art can be effectively overcome, and heat resistance and tenacity of the polycarbonate composition are effectively improved; on the other hand, the flame retardant rating of the polycarbonate composition can be effectively raised, and creepage trace resistance of the polycarbonate composition can be further greatly improved; besides, the phosphate ester homopolymer further has extremely good compatibility with the polycarbonate, a plasticization function on alloy does not exist, heat resistance of the polycarbonate composition is obviously improved, and the high-CTI-value and high-heat-resistance polycarbonate composition is particularly suitable for being used for occasions where the requirement for the use environment is high.

Description

technical field [0001] The invention relates to the technical field of engineering plastics, in particular to a polycarbonate composition with high CTI value and high heat resistance and a preparation method thereof. Background technique [0002] Polycarbonate PC has the advantages of high impact resistance, heat resistance, good dimensional stability, and electrical insulation properties, so it is widely used in auto parts, home appliances, electronic appliances and other fields. [0003] The process of gradually forming a conductive path on the surface of a material under the combined action of an electric field and an electrolyte is called tracking. The CTI value is a measure of the tracking sensitivity of a material, which indicates that the surface of a material can withstand a certain voltage. The highest voltage value for 50 drops of electrolyte without forming leakage traces. The CTI value of a material depends on the formation and accumulation of free carbon on the...

AI Technical Summary

Problems solved by technology

However, the original PC resin is far from reaching this safety standard, so it needs to be modified

[0004] In the prior art, in order to meet the high requirements of material flame retardancy and CTI value, aromatic phosphate flame retardants or sulfonate flame retardants are usually added, but the addition of aromatic phosphate flame retardants usually affects the PC resin produces plasticization, which affects the impact strength and heat resistance of PC resin; while the addition of sulfonate flame retardants maintains the heat resistance of PC resin, but the thin-walled flame retardancy of PC resin will be limited. And the CTI value is not high

In the field of electronic and electrical housing applications, plastics are required to have a high CTI value in many occasions, and due to the exothermic use environment, the material also requires a specific high heat distortion temperature, but there are few products on the market that can meet these two requirements at the same time

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