Preparation of flame-retardant polyester for preparing fiber

Abstract

A method for preparing flame-retardant polyester for manufacturing fiber comprises the following steps: 1) carrying out the esterification of monomer terephthalic acid and ethylene glycol; and 2) adding a reactive flame retardant having a structural formula I to the esterification products, and sequentially carrying out the pre-polymerization reaction and the polycondensation reaction in the presence of a polycondensation catalyst to obtain the polycondensation product, that is, the flame-retardant polyester, wherein R1 in the structural formula I is alkylidene of C1 to C4, and R2 and R3 are respectively H and hydroxyalkyl or carboxyalkyl of C2 to C4. Nano kaolin particles which serve as a flame-retardant polyester crystallization nucleating agent are added to the reaction system, wherein the nano kaolin particles are added before the esterification or before the pre-polymerization reaction, and the adding amount by the content of the nano kaolin particles existing in the polycondensation products at the end is 0.05 wt% to 0.9 wt%. The deviation of the thermal transformation performance existing between the conventional polyester and the prepared flame-retardant polyester is obviously reduced, so that the conventional polyester fiber manufacturing equipment and the manufacturing process thereof can be adopted to reliably manufacture the flame-retardant fiber.

Description

technical field [0001] The invention relates to a method for preparing a flame-retardant polyester, in particular to a method for preparing a flame-retardant polyester containing a phosphorus-based organic reactive flame retardant for manufacturing fibers. Background technique [0002] Polyester with flame-retardant properties has developed rapidly in recent years, and the application fields of products involve civil and industrial applications, among which flame-retardant polyester fibers are the most widely used. The flame retardants used in flame retardant polyester mainly include three types: additive type, copolymerization type and finishing type. Relatively speaking, the flame retardant polyester of copolymerization type is linked to the macromolecular chain of polyester. Therefore, the flame retardant performance is more stable and long-lasting. Phosphorus-based reactive flame retardants have excellent flame retardant properties and are environmentally friendly, and ...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a preparation method of flame-retardant polyester for fiber making. The technical problem to be solved is to reduce the deviation of the prepared flame-retardant polyester from conventional polyester in thermal transition performance, so that it is easier to Manufacture flame-retardant fiber products stably through conventional polyester fiber manufacturing equipment and processes. At the same time, the technical measures required to solve the above technical problems will not adversely affect the manufacture of flame-retardant polyester fibers or the performance of the products produced.

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