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Method for manufacturing phosphorus flame-retardant polyester

A manufacturing method and flame-retardant technology, applied in the direction of single-component copolyester rayon, etc., can solve the problems of large amount of addition, toxicity, and lack of flame retardancy, and achieve high flame-retardant and stable performance. The effect of small amount and high limiting oxygen index

Inactive Publication Date: 2010-03-17
王忠卫
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] PET itself has no flame retardancy, and it has a great fire hazard during use, especially when it is applied to textile or electronic products
[0004] The flame retardant of textiles mainly has the following methods. One is the flame retardant post-treatment of textiles. The disadvantage is that the flame retardant performance cannot last, the appearance of textiles will be significantly worse, and it will also cause toxicity due to the use of halogen flame retardants.
The second is to add flame retardants in the spinning process. The disadvantage is that in spinning or other textile processing processes, temperature changes may cause the decomposition of the added flame retardants and a relatively stable flame retardant content cannot be obtained, which affects the flame retardants. burning effect
This method has related reports in patent 02109909.X, Japanese Patent Laid-Open Publication (Japanese Patent Application Hei 4-364196) and WO95 / 20593. The flame-retardant textiles obtained by this method can completely overcome the defects of the above two methods, but there are additional Defects such as large quantity and complex process

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1 first step, prepare hydroxymethylphenylphosphinic acid (HMPPA) esterification solution:

[0019] Hydroxymethylphenylphosphinic acid (HMPPA) and ethylene glycol (EG) were adjusted into a slurry at a weight ratio of 1:1.6 and then added to the esterification kettle, and the esterification reaction was carried out at 225°C and normal pressure. According to the water yield, when the esterification rate reaches more than 95%, the esterification reaction is terminated, and the excess ethylene glycol (EG) is distilled off under reduced pressure to obtain the required HMPPA esterification liquid.

[0020] 2 The second step is the pre-esterification of terephthalic acid (PTA) and ethylene glycol (EG).

[0021] Add terephthalic acid (PTA) and ethylene glycol (EG) into the esterification tank at a weight ratio of 1.8:1, add 0.03% catalyst quaternary ammonium base by weight of PTA, stir, and carry out esterification under normal pressure and 250°C. For the reaction, properly con...

Embodiment 2

[0026] The catalyst in the third step in Example 1 was changed to titanium tetraisopropylate, and the phosphorus content in the synthesized polyester was 0.56% of the total weight of the polyester, and the limiting oxygen index (LOI) was 33%.

Embodiment 3

[0028] Change the pre-ester liquid weight ratio of HMPPA esterification liquid and terephthalic acid (PTA) to ethylene glycol (EG) in the third step of example 1 to 5.8: 150, and the content of phosphorus in the polyester of synthesis is total polyester 0.57% by weight and a limiting oxygen index (LOI) of 33%.

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Abstract

The invention relates to a method for manufacturing a phosphorus flame-retardant polyester slice, which mainly comprises the following three steps: (1) reacting hydroxymethyl phenyl hypophosphorous acid (HMPPA) with ethylene glycol (EG) to generate HMPPA esterified liquid; (2) pre-esterifying phthalic acid (PTA) and EG; and (3) adding the HMPPA esterified liquid manufactured in the first step intothe esterified liquid manufactured in the second step, adding a catalyst into the mixed esterified liquid, and carrying out a conventional condensation polymerization process to form the flame-retardant polyester slice. Fibers and textiles made of the flame-retardant polyester slice manufactured by the method have good flame-retardant stability, the adding amount of the flame retardant is little,the content of phosphorus is low, and the limiting oxygen index (LOI) is high.

Description

technical field [0001] The invention relates to the technical field of a polymeric polymer halogen-free flame-retardant new material, in particular to a method for manufacturing a halogen-free phosphorus-based flame-retardant polyester chip with good flame-retardant stability. Background technique [0002] The synthesis of polyethylene terephthalate (PET) is a well-known technology, and the process conditions are relatively mature. Mainly, the desired product can be obtained by polycondensing terephthalic acid (PTA) and ethylene glycol (EG) with a suitable catalyst. PET is mainly used as fiber, film, sheet and so on. [0003] PET itself has no flame retardancy, and it has a great fire hazard during use, especially when it is applied to textile or electronic products. [0004] The flame retardant of textiles mainly has the following methods. One is the flame retardant post-treatment of textiles. The disadvantage is that the flame retardant performance cannot be sustained, t...

Claims

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Application Information

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IPC IPC(8): C08G63/78C08G63/692D01F6/84
Inventor 王忠卫侯计金李艳曹克广高军
Owner 王忠卫
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