Halogen-free flame-retardant PBT and preparation thereof

Abstract

The invention discloses a halogen-free flame-retardant PBT which is prepared by the following components according to the percent by weight: 30-70 percent of PBT resin, 0-50 percent of alkali-free glass fiber, 13-35 percent of halogen-free flame retardant, 0-20 percent of toughening agent, 0.5-1 percent of acid absorption agent, 0.5 percent of antioxidant, 0.5-5 percent of colorant and 0.5-1 percent of processing aid. Low-valent organic phosphate flame retardant or the compound of the lower-valent organic phosphate flame retardant and melamine polyphosphate is taken as the halogen-free flamen retardant of the halogen-free flame-retardant PBT, and the acid absorption agent, the toughening agent, the antioxidant and the processing aid are added to the halogen-free flame retardant, thereby the halogen-free flame-retardant PBT which has good flame-retardant effect, high flame-retardant grade, different colors, high mechanical strength and good thermal stability is prepared. The method for preparing the halogen-free flame-retardant PBT has the advantages of easy operation.

Description

technical field [0001] The invention relates to a halogen-free flame-retardant thermoplastic engineering plastic, in particular to a halogen-free flame-retardant PBT and its preparation technology. Background technique [0002] In recent years, the demand for flame-retardant PBT in electronic appliances and various industrial fields is increasing. Its performance characteristics include: fast molding speed, excellent electrical properties, strong flame-retardant performance, chemical resistance, and high mechanical strength. Traditional flame retardant PBT generally uses brominated flame retardants and antimony white compound, this flame retardant system will produce a lot of smoke and release toxic and corrosive hydrogen halide gas when burned. Faced with increasingly stringent environmental protection and safety requirements, as well as the urgent requirements of industries such as electronics, electrical appliances, automobiles, and mechanical instruments for halogen-free...

AI Technical Summary

Problems solved by technology

At present, halogen-free flame-retardant PBT mainly uses red phosphorus as a flame retardant, which has the following disadvantages. First, this type of product can only be black or red, and cannot be produced into other colors; Large, when the injection molding speed and pressure are high, red phosphorus will spontaneously ignite, and a little phosphorus will be precipitated in the mold during long-term injection molding; third, the surface of red phosphorus flame-retardant products placed in a high-humidity environment for a long time will have Water droplets, at a higher ambient temperature, the mechanical decay is faster than brominated flame retardant products

According to other literature reports, PBT products using ordinary phosphorus-based flame retardants have insufficient thermal stability during extrusion and are prone to bubbles