High-temperature-resistant flame retardant of glass fiber/PBT (Poly Butylene Terephthalate) composite material and glass fiber/PBT composite material prepared from high-temperature-resistant flame retardant

Abstract

The invention provides a high-temperature-resistant flame retardant suitable for a glass fiber/PBT (Poly Butylene Terephthalate) composite material. According to the flame retardant provided by the invention, the generation of combustion of the glass fiber/PBT composite material at a relatively low temperature is inhibited by virtue of the decomposition of sodium bicarbonate while the sodium silicate can be converted into silicon dioxide at a high temperature during the combustion, so that the combustion is completely interdicted; a sectional-type flame-retardant mode is adopted, so that the defect of flammability of the glass fiber/PBT is effectively overcome; the sodium silicate and the sodium bicarbonate are highly combined with the glass fiber/PBT composite material and are nontoxic and environmental-friendly, so that the compatibility of the flame retardant and an environment is good. According to the high-temperature-resistant and flame-retardant glass fiber/PBT composite material provided by the invention, the freezing micro-grinding treatment on glass fibers is carried out, and the glass fibers are matched with antimonous oxide and brominated epoxy resins, so that the 'wicking effect' of the glass fibers in the prior art is completely eliminated, and thus the flame-retardant effect of the glass fiber/PBT composite material is further improved. Therefore, the glass fiber/PBT composite material can be applied to the preparation of products with strict requirements on flame retardance such as high-power air switches, high-power relays and terminal blocks.

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