Phosphorus-containing flame retardant monomer, halogen-free flame retardant polyester containing the same and preparation method thereof

Abstract

The invention relates to a preparation method of halogen-free flame retardant polyester phosphorus containing a phosphorus-containing flame retardant monomer. The preparation method includes: according to a mass ratio, adding 100 parts of terephthalic acid, 3.6-15.2 parts of the phosphorus-containing flame retardant monomer, 46.3-54.7 parts of ethylene glycol, 0.035-0.062 part of a catalyst and 0.008-0.015 part of a heat stabilizer into a synthesis reaction kettle, and carrying out a conventional polyester synthesis process to prepare the halogen-free flame retardant polyester with a phosphorus content of 0.8-1.5wt% and an intrinsic viscosity number of 0.63-0.69dL g<-1>. The halogen-free flame retardant polyester provided by the invention has the characteristics of high structural regularity, high degree of crystallinity, and high melting point.

Description

technical field [0001] The invention relates to a phosphorus-containing flame-retardant monomer, a halogen-free flame-retardant polyester containing the monomer and a preparation method thereof, and belongs to the technical field of flame-retardant polyester manufacture. Background technique [0002] Polyethylene terephthalate (PET) has the advantages of high modulus, high strength and elasticity, acid resistance and heat resistance, and has become the largest and most widely used fiber variety in synthetic fibers. Since the 1990s, the polyester and polyester fiber industry has developed rapidly, and my country has become the world's largest producer of polyester. However, due to the flammability of polyester, it is easy to catch fire and cause huge losses to people's lives and property safety, thus limiting its application in some fields. Therefore, the research on flame retardant polyester has always been a hot spot in polyester research, which is of great significance to...

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Problems solved by technology

[0005] From the practical application results, although the reactive flame retardant overcomes the above-mentioned shortcomings of the additive flame retardant, the symmetric structure of the prepared polyester is severely damaged due to the introduction of a large side group, resulting in a relatively low molecular weight drop. Large, resulting in a decrease in crystallization performance, a decrease in melting point, and a significant change in thermal transition performance, which cannot meet some applications that have strict requirements on crystallization performance, such as high-transparency polyester films for the photovoltaic industry, etc.

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