Cationic dyeable PET and composite elastic fiber prepared from same

A composite elastic fiber and cationic technology, applied in the field of composite elastic fiber, can solve problems such as easy dyeing, difficulty in increasing PET molecular weight, inactivation of transesterification catalysts, etc., to avoid side reactions, improve reaction rate and product quality, and increase molecular weight Effect

Active Publication Date: 2020-08-07
ZHANGJIAGANG GLORY CHEM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, during the preparation of PET fibers, the catalytic degradation of sulfonic acid groups and ethylene glycol due to the addition of sodium sulfonate isophthalate and ethylene glycol under the catalysis of titanium dioxide at high temperature not only affects the product color of PET, At the same time, it also deactivates the transesterification catalyst, making it difficult to increase the molecular weight of PET.
[0004] CN103183817A discloses a modified PTT copolyester and its preparation me

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The present embodiment provides a kind of preparation method of cation dyeable PET, it comprises the following steps:

[0055] Put titanium dioxide, terephthalic acid and ethylene glycol in a beating kettle, stir and mix at 100°C, increase the stirring speed from 500r / min to 1500r / min within 10min, and then keep it at 1500r / min for 45min, complete Beating to prepare a slurry; wherein, the mass fraction of titanium dioxide in the slurry is 1.0%, and the molar ratio of terephthalic acid to ethylene glycol is 1:1.10.

[0056] Use nitrogen as a protective gas to esterify the slurry, control the esterification pressure to 0.40MPa, the esterification temperature to 235°C, and the esterification time to 2.0h. 1. Esterification under normal pressure conditions for 1.0 h, the esterification is completed, and an esterification product is prepared.

[0057] Carry out precondensation reaction on the esterification product, control the precondensation temperature to 270°C, the prec...

Embodiment 2

[0064] This embodiment provides a kind of preparation method of cationic dyeable PET / PTT composite elastic fiber, which comprises the following steps:

[0065] The cation-dyeable PET and conventional PTT provided in Example 1 were melt-extruded through a screw respectively, and then shaped by a composite melt-spinning component to prepare a cationic-dyeable PET / PTT composite elastic fiber. In the PET / PTT composite elastic fiber, The mass ratio of conventional PTT to cationic dyeable PET is 40:60.

[0066] When preparing PET / PTT composite elastic fiber, it can be made into composite elastic POY fiber or composite elastic DTY fiber; wherein,

[0067] The preparation process of the composite elastic POY fiber includes: respectively preparing cationic dyeable PET melt and PTT melt - entering the spinning box - entering the spinning assembly - cooling and solidification - winding forming;

[0068] When the melt enters the spinning box stage, the temperature of the PET spinning box...

Embodiment 3

[0076] The present embodiment provides a kind of preparation method of cation dyeable PET, it comprises the following steps:

[0077] Put titanium dioxide, terephthalic acid and ethylene glycol in a beating tank, stir and mix at 110°C, increase the stirring speed from 500r / min to 1500r / min within 10min, and then keep it at 1500r / min for 45min, Finish beating to prepare slurry; wherein, the mass fraction of titanium dioxide in the slurry is 1.5%, and the molar ratio of terephthalic acid to ethylene glycol is 1:1.20.

[0078] Use nitrogen as a protective gas to esterify the slurry, control the esterification pressure to 0.45MPa, the esterification temperature to 245°C, and the esterification time to 3.0h. 1. Esterification under normal pressure for 1.5 h, the esterification was completed, and an esterified product was prepared.

[0079] Carry out precondensation reaction on the esterification product, control the precondensation temperature to 275°C, the precondensation vacuum ...

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Abstract

The invention provides a cationic dyeable PET and a composite elastic fiber prepared from the same. A preparation method of the cationic dyeable PET comprises the following steps: mixing titanium dioxide, terephthalic acid and ethylene glycol, and pulping to obtain slurry; respectively carrying out esterification and pre-polycondensation on the slurry, adding dihydroxypropyl isophthalate-5-sodiumsulfonate into a pre-polycondensation product, and carrying out preliminary melt blending to obtain a primary product of cationic dyeable PET ; and carrying out solid-phase tackifying treatment on theprimary product of the cationic dyeable PET to obtain the cationic dyeable PET. The cationic dyeable PET/PTT composite elastic fiber is prepared from cationic dyeable PET and PTT through melt composite spinning. The problem that complete extinction and deep dyeing of PET fibers are difficult to unify at present is effectively solved, and the prepared product is good in performance, high in additional value, easy in process implementation and beneficial to large-scale production, and has a wide application prospect in elastic fabrics for clothing, home textiles and the like.

Description

technical field [0001] The invention relates to a cationic dyeable PET and a composite elastic fiber prepared therefrom, belonging to the field of fiber forming and processing. Background technique [0002] Chemical fibers are important raw materials in the textile industry. China is a big country of chemical fiber. In terms of chemical fiber production, China's chemical fiber production capacity reached more than 40 million tons in 2015, of which polyester fiber accounted for 70% of the total chemical fiber production. Improving the differentiation and functionalization level of polyester fibers is directly related to the upgrading of polyester products. Comfort modification is the development trend of polyester fiber differentiation and functionalization, among which gloss and dyeing performance are the basis of comfortable polyester fiber products. [0003] At present, during the preparation of PET fibers, the catalytic degradation of sulfonic acid groups and ethylene g...

Claims

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Application Information

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IPC IPC(8): C08G63/688C08G63/80C08K3/22D01F8/14
CPCC08G63/6886C08G63/80C08K3/22D01F8/14C08K2003/2241Y02P70/62
Inventor 严建华韩冰
Owner ZHANGJIAGANG GLORY CHEM IND CO LTD
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