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Preparation of flame-retardant polyester for preparing industrial yarn

A flame-retardant polyester and industrial yarn technology, which is applied in the manufacture of fire-resistant flame-retardant filaments, single-component polyester artificial filaments, etc., to achieve the effect of reducing and improving mechanical properties

Active Publication Date: 2009-03-04
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0006] The invention provides a method for preparing flame-retardant polyester used in industrial yarns. The technical problem to be solved is to reduce the deviation between the prepared flame-retardant polyester and conventional polyester in thermal transition performance, thereby overcoming the At the same time, the technical measures required to solve the above technical problems will not adversely affect the manufacture of flame-retardant polyester industrial yarns or the performance of the products produced

Method used

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  • Preparation of flame-retardant polyester for preparing industrial yarn
  • Preparation of flame-retardant polyester for preparing industrial yarn
  • Preparation of flame-retardant polyester for preparing industrial yarn

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Experimental program
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Effect test

Embodiment 1～4

[0028] 1. Esterification process:

[0029]Monomer terephthalic acid and ethylene glycol undergo esterification reaction, the molar ratio of monomer feed is terephthalic acid: ethylene glycol = 100: 110-200, the reaction temperature is 260-280 ° C, and the reaction pressure is 100-300 kPa , The residence time of the reactants is 1.5 to 4 hours.

[0030] The way of adding nano-kaolin is selected before the esterification reaction. When beating and mixing the esterification raw materials, a required amount of nano kaolin particles is added to the esterification raw materials, and the average particle diameter of the nano kaolin particles is 200-500 nm. The specific feeding amount of nano-kaolin particles in each embodiment is determined according to the content of nano-kaolin in the flame-retardant polyester product, and the content of nano-kaolin in the flame-retardant polyester product in each embodiment is shown in Table 1.

[0031] 2. Precondensation and polycondensation pr...

Embodiment 5～8

[0041] The method of adding nano-kaolin is changed to adding before the polycondensation reaction. First, the nano-kaolin particles, pentaerythritol and reactive flame retardant are beaten and mixed with ethylene glycol as a solvent to prepare a slurry with a total concentration of 20-45wt%. It is then added to the reaction system through the oligomer line. All the other are with embodiment 1~4.

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Abstract

A method for preparing flame-retardant polyester for manufacturing industrial yarn comprises the following steps: 1) carrying out the esterification of terephthalic acid and ethylene glycol; and 2) adding pentaerythritol ester and 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 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 average particle diameter thereof is 200 to 600 nm, 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 0.06 wt% to 1.0 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 polyester industrial yarn.

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 industrial yarns. Background technique [0002] Polyester with flame-retardant properties has developed rapidly in recent years. The application fields of products involve civil and industrial applications. Among them, flame-retardant polyester fibers are the most widely used, especially industrial polyester fibers (or industrial polyester fibers) whose consumption is growing continuously. Polyester industrial yarn), good flame retardancy has gradually become its basic performance requirements. The flame retardants used in flame retardant polyester mainly include three types: additive type, copolymerization reaction type and finishing type. Therefore, the flame retardant performance is more stable and long-lasting. Phosphorus-ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/46C08G63/183C08K5/53D01F1/07D01F6/62
Inventor 林菘王鸣义郁培龄吴以准瞿中凯郭永林张晓静
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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