Flame-retardant and reinforced PBT (polybutylene terephthalate) composite material with high CTI (comparative tracking index) and production process thereof

Abstract

The invention relates to the field of modified engineering plastics, in particular to a flame-retardant and reinforced PBT (polybutylene terephthalate) composite material with high CTI (comparative tracking index) and a production process thereof. The invention is characterized in that the composite material comprises the following ingredients: 53.5-69.5% of PBT (intrinsic viscosity: 0.83dl / g), 4.3-5.6% of composite toughening agent (polyethylene: ethylene / vinyl acetate copolyester=3:1), 7.7-10.8% of decabromodiphenyl ethane, 3.9-5.8% of antimonous oxide, 0.20-0.80% of fluororesin (polytetrafluoroethylene and polyvinylidene fluoride blend) and 10-30% of alkali-free glass fiber. Compared with the prior art, the invention can obtain the CTI 250-350 and achieve the flame retardance 94UL-V0 level (0.8mm, 1.6mm); meanwhile, the invention keeps good mechanical properties of the materials, meets the requirement of the material of electronic components applied to the field of unserviced white goods, and fully meets the toughness requirement and molding process requirement of thin-wall products (thickness is below 0.8mm). The composite material provided by the invention is superior to the material on the market and has lower cost, and simultaneously the application field of the flame-retardant and reinforced PBT composite material in an ordinary bromine fire-retardant system is expanded.

Description

[technical field] [0001] The invention relates to the field of modified engineering plastics, in particular to a flame-retardant reinforced PBT composite material with high CTI and a production process thereof. [Background technique] [0002] At present, the flame retardant reinforced PBT composite material with high relative leakage trace index (CTI) is generally realized by adding a halogen-free flame retardant system, but the flame retardant reinforced PBT composite material with high relative leakage trace index produced by the halogen-free flame retardant system The cost is expensive, and compared with the brominated flame retardant system commonly used at present, the added amount of the halogen-free flame retardant system is large, resulting in poor mechanical properties of the material, which is not suitable for the production of thin-walled white goods used in unattended white goods. Electronic components can easily cause cracking or brittle cracking of the product....

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