Halogen-free flame retardant PC/PET composite material with good appearance and preparation method thereof

Abstract

The invention discloses a halogen-free flame retardant PC / PET composite material with a good appearance, which comprises 60-75 parts of PC resin, 8-12 parts of PET resin, 3-10 parts of polystyrene resin, 3.0-13.0 parts of a flexibilizer, 8-20 parts of a halogen-free flame retardant, 0.05-0.3 part of an antioxidant and 0.5-0.8 part of other additives, wherein the halogen-free flame retardant is a solid poly-condensed type halogen-free phosphate flame retardant. The PC / PET composite material prepared according to the preparation method disclosed by the invention selects high impact polystyrene, so that the liquidity of the composite material is greatly promoted, the appearance of the welded wire is improved while the toughness of the composite material is not influenced, the acquired composite material is higher in liquidity, fire resistance and mechanical property and the composite material is suitable for a thin-wall part and especially is suitable for the occasion with higher requirement for use environment.

Description

technical field [0001] The invention relates to a PC / PET composite material and a preparation method thereof, in particular to a halogen-free flame-retardant PC / PET composite material with good appearance and a preparation method thereof, belonging to the technical field of polymer composite materials and processing thereof. Background technique [0002] PC / PET composite material combines the toughness, heat resistance of PC resin and solvent resistance of PET resin, etc., and has attracted more and more attention. However, compared with pure PC resin or mainstream PC / ABS composite materials, PC / PET composite materials are limited by halogen-free flame retardancy when they are used in electronics, electrical appliances and other industries, which greatly reduces the scope of use of the composite materials. At present, halogen-free flame retardants such as metal salts and phosphate esters are often used in PC resin and PC / ABS composite materials in the prior art, but any use ...

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Problems solved by technology

However, compared with pure PC resin or mainstream PC / ABS composite materials, PC / PET composite materials are limited by halogen-free flame retardancy when used in electronics, electrical appliances and other industries, which greatly reduces the scope of use of the composite material.

At present, halogen-free flame retardants such as metal salts and phosphate esters are often used in PC resin and PC / ABS composite materials in the prior art, but any use of the above-mentioned halogen-free flame retardants will greatly affect the mechanical properties of PC / PET composite materials , and low flame retardant efficiency

In addition, the compatibility between PC resin and PET resin is poor. Due to the incompatibility between the two and the large difference in fluidity during the molding process, appearance defects such as obvious weld lines or even blackening are prone to occur, which seriously limits the composite. Application of material as weld line material

[0003] At present, in the prior art, polymeric phosphorus-containing flame retardants are used as halogen-free flame retardants to obtain halogen-free flame-retardant PC / thermoplastic polyester compositions with high flame retardancy and toughness, but polymeric phosphorus-containing flame retardants The damage to the toughness of the composition is huge. In order to make up for the loss of toughness caused by the above-mentioned polymeric phosphorus-containing flame retardants, researchers in the prior art use a large number of siloxane tougheners and polycarbonate-polydimethylsiloxane Oxyalkylene copolymer to improve toughness, although it supplements the toughness of the composition, it greatly increases the material cost of the mixture. In addition, the prior art does not involve practical application appearance evaluation, especially does not involve the appearance when it is used as a weld line material Evaluation

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