A kind of high temperature resistant flame retardant of glass fiber/PBT composite material and glass fiber/PBT composite material prepared therefrom

Abstract

A kind of high-temperature-resistant flame retardant suitable for glass fiber / PBT composite material provided by the present invention uses the decomposition of sodium bicarbonate to suppress the occurrence of combustion of glass fiber / PBT composite material at a lower temperature, while sodium silicate can It is converted into silicon dioxide at a high temperature of combustion, completely blocking combustion; the segmented flame retardant method can effectively overcome the flammability shortcomings of glass fiber / PBT; and sodium silicate and sodium bicarbonate and glass fiber / PBT composite materials It has a high degree of combination, is non-toxic and environmentally friendly, and has good compatibility with the environment. The high-temperature-resistant and flame-retardant glass fiber / PBT composite material provided by the present invention, the glass fiber is frozen and pulverized, and it is equipped with antimony trioxide and brominated epoxy resin, which completely eliminates the "wick" of the glass fiber in the prior art. Effect", which further improves the flame retardant effect of glass fiber / PBT composite materials, so that it can be applied to the preparation of high-power air switches, high-power relays, terminal blocks and other products that require strict flame retardant properties.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a high-temperature-resistant flame retardant for a glass fiber / PBT composite material and a glass fiber / PBT composite material prepared therefrom. Background technique [0002] PBT (polybutylene terephthalate) is one of the most widely used engineering plastics at present. It has good mechanical strength, wear resistance and insulation. It is widely used in electronic appliances, auto parts, machinery, household products, etc. PBT products, together with PPS, PC, POM, PA, etc., are called the five general-purpose engineering plastics. However, PBT is flammable. At the same time, when it is heated and burned, it is particularly prone to droplet phenomenon, thereby igniting other combustibles. The flame retardancy cannot meet the requirements of some industries, which limits its wider application. Because it is a PBT / glass fiber composite material with good mechanical pr...

AI Technical Summary

Problems solved by technology

In order to achieve better flame retardant effect, the existing PBT / glass fiber products all add halogen flame retardants such as bromine and chlorine to their raw materials. Although the flame retardant effect is excellent, it will produce smoky and highly toxic halogenated Hydrogen and other halogen-containing organic substances, and dioxins will be produced when burned, which is extremely harmful to the human body

As we all know, halogen-based flame retardant materials will produce a large amount of toxic and corrosive smoke when burned, which will pollute and corrode the environment and molds, and have been banned in many developed countries; most halogen-free flame-retardant Although the effect of the drug is good, it is difficult to promote its use in China due to the high cost

In addition, these flame retardants have no substantial mitigation effect on the "wicking effect" of glass fibers, and are not resistant to high temperatures, and are easy to decompose and fail at high temperatures, which cannot fundamentally solve the poor fire performance of PBT / glass fiber composites The problem