A kind of porous supersoft linen-like polyester fiber and its preparation method

Abstract

The invention relates to a porous super-soft linen-like polyester fiber and a preparation method thereof. Modified polyester is spun by a porous spinneret plate to prepare the porous super-soft linen-like polyester fiber. The spinneret orifices in the spinneret plate are arranged in an oval shape. The center of the spinneret orifices is positioned on the center of concentric ellipses; the concentric ellipses are a series of ellipses, long axes of all ellipses are collinear, and moreover, short axes of all ellipses are collinear. The porous super-soft linen-like polyester fiber is prepared from modified polyester POY yarns and modified polyester FDY yarns. The modified polyester preparation method comprises the following steps: reacting terephthalic acid with glycol to obtain ethylene glycol terephthalate, reacting ethylene glycol terephthalate with added branch chain containing hexylene glycol to generate dihydric alcohol terephthalate, and keeping on reactions to obtain modified polyester. The prepared fiber has excellent performances: the linear density deviation ratio is not more than 2.0%, the breaking strength CV value is not more than 4.0%, the breaking elongation CV value is not more than 8.0%, and the crimp contraction variable coefficient CV value is not more than 8.0%.

Description

technical field

[0001] The invention belongs to the field of polyester fibers, and relates to a porous supersoft hemp-like polyester fiber and a preparation method thereof. Background technique

[0002] Since its inception, polyethylene terephthalate (PET fiber or polyester fiber) fiber has high breaking strength and elastic modulus, moderate resilience, excellent heat setting, good heat resistance and light resistance, acid resistance, alkali resistance and corrosion resistance. It has a series of excellent performances, such as anti-wrinkle and non-ironing, and good crispness. It is widely used in clothing, home textiles and other fields.

[0003] However, due to the high crystallinity and compact structure of PET, and there is no functional group combined with the dye on the molecular chain, it is difficult for the dye molecule to enter the fiber and dyeing is difficult. Can't satisfy people to bright-coloured beautiful, the fabric demand of unique style.

[0004] The r...

Examples

Embodiment 1

[0080] A preparation method of modified polyester, specifically comprising the following steps:

[0081] (1) Preparation of glycol terephthalate:

[0082] Add terephthalic acid and 2-pentyl-1,6 hexanediol into a slurry with a molar ratio of 1:1.3 and add it to the reactor at a concentration of 50 wt%, and the amount added is 0.3% of the weight of terephthalic acid Under the catalysis of concentrated sulfuric acid, the 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. 90% is the end point of the esterification reaction to obtain diol terephthalate;

[0083] (2) Preparation of ethylene terephthalate:

[0084] 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 pres...

Embodiment 2

[0091] 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 ...

Embodiment 3

[0094] 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...

technical field

[0001] The invention belongs to the field of polyester fibers, and relates to a porous supersoft hemp-like polyester fiber and a preparation method thereof. Background technique

[0002] Since its inception, polyethylene terephthalate (PET fiber or polyester fiber) fiber has high breaking strength and elastic modulus, moderate resilience, excellent heat setting, good heat resistance and light resistance, acid resistance, alkali resistance and corrosion resistance. It has a series of excellent performances, such as anti-wrinkle and non-ironing, and good crispness. It is widely used in clothing, home textiles and other fields.

[0003] However, due to the high crystallinity and compact structure of PET, and there is no functional group combined with the dye on the molecular chain, it is difficult for the dye molecule to enter the fiber and dyeing is difficult. Can't satisfy people to bright-coloured beautiful, the fabric demand of unique style.

[0004] The r...

Examples

Embodiment 1

[0080] A preparation method of modified polyester, specifically comprising the following steps:

[0081] (1) Preparation of glycol terephthalate:

[0082] Add terephthalic acid and 2-pentyl-1,6 hexanediol into a slurry with a molar ratio of 1:1.3 and add it to the reactor at a concentration of 50 wt%, and the amount added is 0.3% of the weight of terephthalic acid Under the catalysis of concentrated sulfuric acid, the 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. 90% is the end point of the esterification reaction to obtain diol terephthalate;

[0083] (2) Preparation of ethylene terephthalate:

[0084] 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 pres...

Embodiment 2

[0091] 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 ...

Embodiment 3

[0094] 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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