Halogen-free compound flame retardant for glass fiber reinforced PBT (Polybutylene Terephthalate) material and preparation method thereof

Abstract

The invention discloses a halogen-free compound flame retardant for a glass fiber reinforced PBT (Polybutylene Terephthalate) material and a preparation method thereof. The halogen-free compound flame retardant is prepared from the following components in percentage by weight: 20-80 percent of phenyl aluminum phenylphosphinate, 10-60 percent of melamine cyanurate, 1-20 percent of zinc borate, 1-10 percent of triphenyl phosphate and 1-5 percent of pentaerythrityl tetraisostearate. The halogen-free compound flame retardant provided by the invention has high-efficiency flame-retardant performance, favorable processing performance, excellent mechanical performance and color stability and is applied to the glass fiber reinforced PBT material so that the glass fiber reinforced PBT material reaches a flame-retardant level of UL94V0 and can keep favorable mechanical performance and electric performance.

Description

technical field [0001] The invention relates to a halogen-free composite flame retardant applied to glass fiber reinforced polydibutyl terephthalate (PBT) materials. Background technique [0002] Polybutylene terephthalate, referred to as PBT, is a milky white color formed by polycondensation of 1.4-butanediol and terephthalic acid or terephthalate (DMT), and made through a mixing process. Translucent to opaque, crystalline thermoplastic polyester resin. PBT was first successfully developed by German scientists in 1942, and then industrialized in the United States. In 1970, it was put on the market with 30% glass fiber reinforced PBT plastic. Glass fiber reinforced PBT has excellent mechanical properties, electrical properties and heat resistance, and is widely used in automobiles, connectors, coil bobbins, electrical casings and other electrical and electronic components after flame retardant modification. In the prior art, the flame retardant additives used for glass fib...

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Problems solved by technology

U.S. Patent US6255371 B1 proposes aluminum diethylphosphinate compounded with nitrogen-containing compound flame retardant glass fiber reinforced PBT material, the flame retardancy of 0.8mm thick sample reaches UL 94V-0 level, but this kind of product is expensive and not cost-effective High; US20080090950 proposes inorganic hypophosphite compound nitrogen-containing compound flame-retardant glass fiber reinforced PBT material, and its flammability passes UL 94V-0 level / 0.8mm, but the composition has poor dispersibility in PBT, resulting in mechanical damage of PBT material poor performance