Ultra-soft polyester fiber-polyester fiber complex yarn and preparation method thereof

Abstract

The invention relates to ultra-soft polyester fiber-polyester fiber complex yarn and a preparation method thereof. The preparation method comprises the steps of firstly, introducing diol, of which a principal chain contains silicon, and tert-butyl side group containing diacid into polyester so as to prepare modified polyester, then, preparing modified polyester FDY (Fully Drawn Yarn) and modifiedpolyester POY (Pre-Oriented Yarn) from modified polyester melt separately by an FDY process and a POY process, and doubling the modified polyester FDY and the modified polyester POY, thereby obtainingthe ultra-soft polyester fiber-polyester fiber complex yarn, wherein the diol, of which the principal chain contains silicon, is dimethyl silicone diol, dimethyl diphenyl disiloxane diol or tetramethyl disiloxane diol, and the tert-butyl side group containing diacid is 5-tert-butyl-1,3-benzene dicarboxylic acid, 2-tert-butyl-1,6-hexyldicarboxylic acid, 3-tert-butyl-1,6-hexyldicarboxylic acid or 2,5-ditert-butyl-1,6-hexyldicarboxylic acid. At the temperature of 123 DEG C, the ultra-soft polyester fiber-polyester fiber complex yarn has the dye uptake of 86.3% to 90.2% and a K / S value of 21.15 to 23.4. The method provided by the invention is simple in operation, and prepared fibers are good in dyeing behavior.

Description

technical field

[0001] The invention belongs to the technical field of modified fibers, and relates to a supersoft polyester composite yarn and a preparation method thereof. Background technique

[0002] Due to the unique chemical structure of polyester macromolecular chain, polyester fiber has good physical and chemical properties and the fabric prepared from it is stiff, but its unique chemical structure also endows polyester fiber and its fabric with low hygroscopicity and resistance Disadvantages such as poor electrostatic performance, easy pilling, stiff fabric feel, poor wool feel and strong waxy texture. Along with the raising of people's living standard, also constantly improve to the wearing requirement of clothes, its weak point is revealed day by day. With the finer denier of the fiber, the specific surface area of ​​the fiber increases, the adsorption capacity increases, the micropores of the fabric are small and many, and it has the characteristics of soft hand...

Examples

Embodiment 1

[0057] A method for preparing supersoft polyester-polyester composite yarn, the preparation steps are as follows:

[0058] (1) prepare modified polyester;

[0059] (1.1) Esterification reaction;

[0060] Make a slurry of terephthalic acid, ethylene glycol, dimethylsilanediol and 5-tert-butyl-1,3-benzenedicarboxylic acid, add antimony trioxide, titanium dioxide and triphenyl phosphate and mix evenly, The esterification reaction is carried out under normal pressure in a nitrogen atmosphere. The temperature of the esterification reaction is 255 ° C. When the amount of water distilled in the esterification reaction reaches 95% of the theoretical value, it is the end point of the esterification reaction. The molar ratio of formic acid to ethylene glycol is 1:1.8, the sum of the added amount of dimethylsilanediol and 5-tert-butyl-1,3-benzenedicarboxylic acid is 5mol% of the added amount of terephthalic acid, dimethyl The molar ratio of dibasic acid of silicon diol and 5-tert-butyl...

Embodiment 2

[0085] A method for preparing supersoft polyester-polyester composite yarn, the preparation steps are as follows:

[0086] (1) prepare modified polyester;

[0087] (1.1) Esterification reaction;

[0088] Make a slurry of terephthalic acid, ethylene glycol, dimethyldiphenyldisiloxanediol and 5-tert-butyl-1,3-phthalic acid, add antimony ethylene glycol, titanium dioxide and triphosphate After the methyl ester is mixed evenly, pressurize the esterification reaction in a nitrogen atmosphere. The pressurized pressure is 0.3MPa, and the temperature of the esterification reaction is 250°C. is the end point of the esterification reaction, wherein the molar ratio of terephthalic acid to ethylene glycol is 1:1.2, and the ratio of dimethyldiphenyldisiloxane diol and 5-tert-butyl-1,3-phthalic acid The sum of the addition amount is 3.5mol% of the addition amount of terephthalic acid, and the mol ratio of the dibasic acid of dimethyldiphenyldisiloxane diol and 5-tert-butyl-1,3-phthalic ac...

Embodiment 3

[0101] A method for preparing supersoft polyester-polyester composite yarn, the preparation steps are as follows:

[0102] (1) prepare modified polyester;

[0103] (1.1) Preparation of 2-tert-butyl-1,6-hexanedicarboxylic acid;

[0104] First mix tungstic acid and hydrogen peroxide, stir at room temperature for 12 minutes, then add 2-tert-butylcyclohexanol to react at 83°C for 1.5h, then raise the temperature to 92°C for 2.5h, during the reaction, the reaction The product is always in a reflux state, and finally undergoes cooling crystallization, washing and refining to obtain 2-tert-butyl-1,6-hexanedicarboxylic acid. At the beginning of the reaction, the molar ratio of tungstic acid, 2-tert-butylcyclohexanol and hydrogen peroxide is 1 :35:140;

[0105] (1.2) Esterification reaction;

[0106] Make a slurry of terephthalic acid, ethylene glycol, tetramethyldisiloxane diol and 2-tert-butyl-1,6-hexanedicarboxylic acid, add antimony acetate, titanium dioxide and trimethyl phosph...

technical field

[0001] The invention belongs to the technical field of modified fibers, and relates to a supersoft polyester composite yarn and a preparation method thereof. Background technique

[0002] Due to the unique chemical structure of polyester macromolecular chain, polyester fiber has good physical and chemical properties and the fabric prepared from it is stiff, but its unique chemical structure also endows polyester fiber and its fabric with low hygroscopicity and resistance Disadvantages such as poor electrostatic performance, easy pilling, stiff fabric feel, poor wool feel and strong waxy texture. Along with the raising of people's living standard, also constantly improve to the wearing requirement of clothes, its weak point is revealed day by day. With the finer denier of the fiber, the specific surface area of ​​the fiber increases, the adsorption capacity increases, the micropores of the fabric are small and many, and it has the characteristics of soft hand...

Examples

Embodiment 1

[0057] A method for preparing supersoft polyester-polyester composite yarn, the preparation steps are as follows:

[0058] (1) prepare modified polyester;

[0059] (1.1) Esterification reaction;

[0060] Make a slurry of terephthalic acid, ethylene glycol, dimethylsilanediol and 5-tert-butyl-1,3-benzenedicarboxylic acid, add antimony trioxide, titanium dioxide and triphenyl phosphate and mix evenly, The esterification reaction is carried out under normal pressure in a nitrogen atmosphere. The temperature of the esterification reaction is 255 ° C. When the amount of water distilled in the esterification reaction reaches 95% of the theoretical value, it is the end point of the esterification reaction. The molar ratio of formic acid to ethylene glycol is 1:1.8, the sum of the added amount of dimethylsilanediol and 5-tert-butyl-1,3-benzenedicarboxylic acid is 5mol% of the added amount of terephthalic acid, dimethyl The molar ratio of dibasic acid of silicon diol and 5-tert-butyl...

Embodiment 2

[0085] A method for preparing supersoft polyester-polyester composite yarn, the preparation steps are as follows:

[0086] (1) prepare modified polyester;

[0087] (1.1) Esterification reaction;

[0088] Make a slurry of terephthalic acid, ethylene glycol, dimethyldiphenyldisiloxanediol and 5-tert-butyl-1,3-phthalic acid, add antimony ethylene glycol, titanium dioxide and triphosphate After the methyl ester is mixed evenly, pressurize the esterification reaction in a nitrogen atmosphere. The pressurized pressure is 0.3MPa, and the temperature of the esterification reaction is 250°C. is the end point of the esterification reaction, wherein the molar ratio of terephthalic acid to ethylene glycol is 1:1.2, and the ratio of dimethyldiphenyldisiloxane diol and 5-tert-butyl-1,3-phthalic acid The sum of the addition amount is 3.5mol% of the addition amount of terephthalic acid, and the mol ratio of the dibasic acid of dimethyldiphenyldisiloxane diol and 5-tert-butyl-1,3-phthalic ac...

Embodiment 3

[0101] A method for preparing supersoft polyester-polyester composite yarn, the preparation steps are as follows:

[0102] (1) prepare modified polyester;

[0103] (1.1) Preparation of 2-tert-butyl-1,6-hexanedicarboxylic acid;

[0104] First mix tungstic acid and hydrogen peroxide, stir at room temperature for 12 minutes, then add 2-tert-butylcyclohexanol to react at 83°C for 1.5h, then raise the temperature to 92°C for 2.5h, during the reaction, the reaction The product is always in a reflux state, and finally undergoes cooling crystallization, washing and refining to obtain 2-tert-butyl-1,6-hexanedicarboxylic acid. At the beginning of the reaction, the molar ratio of tungstic acid, 2-tert-butylcyclohexanol and hydrogen peroxide is 1 :35:140;

[0105] (1.2) Esterification reaction;

[0106] Make a slurry of terephthalic acid, ethylene glycol, tetramethyldisiloxane diol and 2-tert-butyl-1,6-hexanedicarboxylic acid, add antimony acetate, titanium dioxide and trimethyl phosph...

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