A kind of halogen-free flame-retardant reinforced PBT composite material and its preparation method and application

Abstract

The invention discloses a halogen-free and flame-retarding enhanced PBT (Polybutylene Terephthalate) composite material. The halogen-free and flame-retarding enhanced PBT composite material is prepared from the following raw material components in parts by weight: 40 to 50 parts of PBT resin, 8 to 12 parts of anti-warping resin, 20 to 30 parts of a flame retardant, 25 to 35 parts of a filling agent, 3 to 5 parts of a compatilizer and 0.4 to 0.8 part of an antioxidant, wherein the intrinsic viscosity of the PBT resin is 0.83dl / g to 0.86dl / g; the content of a copper element and the content of a titanium element in a resin matrix satisfy the following formula: Cu is greater than or equal to 50ppm and less than or equal to Ti, and Ti is greater than or equal to Cu and is less than or equal to 200ppm. According to the halogen-free and flame-retarding enhanced PBT composite material, factors including the intrinsic viscosity, the content of trace impurities and the like of the resin are systematically evaluated so as to ensure that the composite material has excellent thin-wall processing property and anti-ageing performance; aiming at component proportioning and optimization of the flame retardant and the antioxidant, specific compounding of a halogen-free and flame-retarding system and specific compounding of an antioxidant system are further limited, so that the PBT composite material has an excellent thermal-oxidative ageing resisting property.

Description

technical field [0001] The invention relates to the field of polymer composite materials, in particular to a halogen-free flame-retardant reinforced PBT composite material and a preparation method and application thereof. Background technique [0002] Polybutylene terephthalate (PBT) is a semi-crystalline thermoplastic polyester with good heat resistance, weather resistance and chemical resistance, as well as excellent electrical properties and low water absorption And good product appearance and other advantages, it is widely used in automobile, mechanical equipment, electronic and electrical manufacturing industries, these industries have strict requirements on combustion and safety. For a long time, the flame retardants used in flame retardant PBT are mostly halogen flame retardants, such as decabromodiphenylethane and brominated epoxy resin. Halogenated flame retardants have the following disadvantages: easy to precipitate from the surface of the material, corrode the m...

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Problems solved by technology

Halogenated flame retardants have the following disadvantages: easy to precipitate from the surface of the material, corrode the mold, and can produce a large amount of conductive ions and carbon particle deposits, which promotes current leakage, greatly reduces the relative leakage index of the material, and generates a large amount of Toxic fumes, so halogen-free flame-retardant PBT products have become an inevitable trend in the development of various application industries

[0003] Chinese patent 201510309013.1 discloses a halogen-free flame-retardant reinforced PBT material, which records a flame-retardant system composed of pentaerythritol diphosphate melamine salt, melamine urate, aluminum hypophosphite, and triphenyl phosphate, but the flame-retardant system Insufficient thermal stability and processability of prepared composites

[0004] Chinese patent 201410019072.0 discloses a low-warpage flame-retardant reinforced PBT relay special material and its application. It records that the anti-warpage resin is one or more of SMA, ASA, ABS, AES, AS and ACS, but only This solution is still difficult to achieve more excellent low warpage performance

There is still no ideal modified plastic in the current industry, which meets the requirements of halogen-free flame retardancy and has excellent mechanical properties and thermal-oxidative aging resistance

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