Porous super-bright trilobal profiled polyester fiber and production method thereof
A technology of three-lobed special-shaped polyester fiber, which is applied in the field of polyester fiber, can solve problems such as poor mechanical properties and uneven dyeing of polyester fiber, and achieve the effects of improving processing performance, improving dyeing performance, and reducing melt viscosity
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Embodiment 1
[0062] A preparation method of modified polyester, specifically comprising the following steps:
[0063] (1) Preparation of glycol terephthalate:
[0064] Put terephthalic acid and 2-pentyl-1,3 propanediol with a molar ratio of 1:1.3 into a slurry and add it to the reactor at a concentration of 50 wt%, and the addition amount is 0.3% of the weight of terephthalic acid. Under the catalysis of sulfuric acid, esterification reaction is carried out. The esterification reaction is pressurized in a nitrogen atmosphere. The pressurized pressure is normal pressure and the temperature is 180°C. Time is the end point of the esterification reaction to obtain diol terephthalate;
[0065] (2) Preparation of ethylene terephthalate:
[0066] Put terephthalic acid and ethylene glycol into a slurry with a molar ratio of 1:1.2 and put them into the reactor to carry out esterification reaction. The esterification reaction is pressurized in a nitrogen atmosphere. The pressurized pressure is nor...
Embodiment 2
[0074]The preparation process of the modified polyester of embodiment 2 is the same as embodiment 1, and wherein main technical parameter is referring to table 1; After step (3) adds diol terephthalate, stirs and mixes for 16 minutes, when add-on is Under the action of 0.011% of the catalyst antimony trioxide of the total weight of terephthalic acid and the stabilizer triphenyl phosphate of 0.02% of the total weight of terephthalic acid, the low vacuum stage is started under the condition of negative pressure For the polycondensation reaction, the pressure at this stage is steadily pumped from normal pressure to an absolute pressure of 490Pa, the temperature is controlled at 262 ° C, and the reaction time is 31 minutes; then continue to vacuumize and carry out the polycondensation reaction in the high vacuum stage to reduce the reaction pressure to an absolute pressure of 90Pa. The reaction temperature was controlled at 276° C., and the reaction time was 51 minutes to prepare t...
Embodiment 3
[0077] The preparation process of the modified polyester of embodiment 3 is the same as embodiment 1, and wherein main technical parameter is referring to table 1; After step (3) adds diol terephthalate, stirs and mixes for 16 minutes, when add-on is Under the action of 0.03% of the catalyst antimony trioxide of the total weight of terephthalic acid and the stabilizer triphenyl phosphate of 0.02% of the total weight of terephthalic acid, the low vacuum stage is started under the condition of negative pressure For the polycondensation reaction, the pressure at this stage is steadily pumped from normal pressure to an absolute pressure of 498Pa, the temperature is controlled at 263°C, and the reaction time is 32 minutes; then continue to vacuumize and carry out the polycondensation reaction in the high vacuum stage, so that the reaction pressure drops to an absolute pressure of 90Pa. The reaction temperature was controlled at 277° C., and the reaction time was 57 minutes to prepar...
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