Preparation of flame-retardant polyester for preparing industrial yarn
A flame-retardant polyester, manufacturing industry technology, applied in the field of preparation of flame-retardant polyester, to achieve the effect of improving the decline in mechanical properties
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Embodiment 1~4
[0028] 1. Esterification process:
[0029] The monomer terephthalic acid, ethylene glycol, pentaerythritol and the reactive flame retardant undergo esterification reaction, and the reactive flame retardant is a compound with the following structural formula:
[0030]
[0031] Among them, R 1 is methylene, R 2 , R 3For hydroxyethyl.
[0032] The feeding ratio of raw materials is controlled respectively as follows:
[0033] In molar ratio, terephthalic acid: ethylene glycol=100:110~200;
[0034] In terms of weight ratio, terephthalic acid: pentaerythritol=100:0.01~0.12, specific data and content of pentaerythritol in flame-retardant polyester products are shown in Table 1;
[0035] In terms of weight ratio, terephthalic acid: reactive flame retardant = 100: 2.90-14.60, see Table 1 for specific data and flame retardant content in flame-retardant polyester products.
[0036] The way of adding nano-kaolin is selected before the esterification reaction. When the raw materi...
Embodiment 5~8
[0043] The method of adding nano-kaolin is changed to adding before the polycondensation reaction. Firstly, nano-kaolin particles are beaten and mixed with ethylene glycol to prepare a slurry with a concentration of 20-45 wt%, and then added to the reaction system through the oligomer pipeline. All the other are with embodiment 1~4.
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