Preparation method of polyester fiber fire retardant

Abstract

The invention discloses a preparation method of a polyester fiber fire retardant. The preparation method comprises the following steps: adding tri(phosphine oxide) and a UV stabilizing agent into tetraphenyl diphosphonate, carrying out reactions for a while to prepare an intermediate; adding the intermediate into a stirring machine, stirring the intermediate at a constant speed and a certain temperature for a while, when the ratio of tri(phosphine oxide): tetraphenyl diphosphonate: the UV stabilizing agent of the intermediate reaches 4.5:1:0.05, stopping stirring; adding a certain amount of catalyst into the heated and stirred intermediate, stirring at a constant speed and a certain temperature for a while; adjusting the temperature to 160 to 180 DEG C, adding a certain amount of phenol and catalyst, carrying out reactions for a while; adding a certain amount of tricyanurate into the formed solution; controlling a certain reaction temperature to make the formed solution carry out end capping reactions to prepare the polyester fiber fire retardant. The fire retardant has the advantages of simple structure and practicality.

Description

technical field [0001] The invention relates to polyester chemical fiber and polyester resin, in particular to a method for preparing a polyester chemical fiber flame retardant. Background technique [0002] The earliest halogen-containing flame retardant used in polyester fibers is an inorganic flame-retardant addition method. Due to the release of a large amount of toxic gases during the combustion process, some may even be carcinogenic. Later, halogen-free flame retardants were invented. Among halogen flame retardants, phosphorus-containing flame retardants have been widely used because they produce very little toxic gas. Traditional small-molecule halogen-free flame retardants are used in products and have poor compatibility with polymers, which are easy to melt. It is uneven and will reduce the mechanical strength of the polymer. In the later stage, the high-phosphorus flame-retardant material that reacts with the polyester material through the reaction kettle with the ...

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Problems solved by technology

[0002] The earliest halogen-containing flame retardant used in polyester fibers is an inorganic flame-retardant addition method. Due to the release of a large amount of toxic gases during the combustion process, some may even be carcinogenic. Later, halogen-free flame retardants were invented. Among halogen flame retardants, phosphorus-containing flame retardants have been widely used because they produce very little toxic gas. Traditional small-molecule halogen-free flame retardants are used in products and have poor compatibility with polymers, which are easy to melt. It is uneven and will reduce the mechanical strength of the polymer. In the later stage, the high-phosphorus flame-retardant material that reacts with the polyester material through the reaction kettle with the esterification liquid will cause a complex processing and production process in the application, and waste of resources. At the same time, the earliest The halogen-containing flame retardant used for polyester fiber is an inorganic flame-retardant addition method. Due to the release of a large amount of toxic gases during the combustion process, some may even be carcinogenic. Later, a halogen-free flame retardant was invented. Among the flame retardants, phosphorus-containing flame retardants have been widely used because they produce very little toxic gas. Traditional small-molecule halogen-free flame retardants are used in products and have poor compatibility with polymers, which are prone to uneven melting of products. And it will reduce the mechanical strength of the polymer. The processing and production process of the high-phosphorus flame-retardant material that reacts with the polyester material through the reaction kettle with the esterification liquid in the later stage will result in a complex processing and production process, waste of resources, poor spinnability, and cannot be directly processed. Added to recycled polyester bottle flakes, which must be spun into fibers from raw materials

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