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Method for preparing highly uniform spandex fiber

A technology of spandex fiber and uniformity is applied in the field of high-uniformity spandex yarn dry-process spandex fiber and its preparation, and can solve the problems of not being able to meet the use requirements and the like

Active Publication Date: 2016-06-01
ZHEJIANG KAIPUTE SPANDEX
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The most important data to measure the uniformity of spandex products is the variation coefficient CV value of the dynamic unwinding stress value data (variation coefficient C V = (standard deviation SD / average value MN) × 100%, and the testing equipment is the dynamic stress detector ST -80), the CV value of the detection data of domestic conventional spandex products is usually about 5%, and the CV value of products with relatively good uniformity should reach about 3.5%, while high-uniformity spandex products usually refer to the dynamic stress CV value less than 2% of the products, so other domestic spandex products cannot meet the requirements in the fields of high-end circular knitting machines and warp knitting that require high uniformity

Method used

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  • Method for preparing highly uniform spandex fiber

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preparation example Construction

[0021] The preparation method of high uniformity spandex fiber of the present invention comprises the following steps:

[0022] (1) Steps to improve the uniformity of spandex products in the polymerization solvent section: dry-process spandex fiber production can be carried out with different solvents, and the solubility of various solvents is very different, and the solvent with good solubility will reduce the impurities in the polymer , the polymer has high purity. At present, the main solvent used is DMF or DMAC. The impurity content indicators in the solvent, such as moisture, conductivity, and pH, also have a greater impact on the uniformity of spandex. At present, the indicators of general spandex manufacturers are: moisture 50-100PPM, conductance 0.3-0.4μS / cm, acid content ≤50-80PPM;

[0023] In the present invention, DMAC, a solvent with better solubility, is selected and purified by a special form of ion exchange resin to reduce impurities in DMAC and improve the puri...

Embodiment 1

[0033] In step 1, the solvent is 45PPM moisture, 0.12μS / cm conductance; DMAC with acid content 23PPM, in step 2, PTG with a molecular weight of 1805 and a molecular weight distribution of 2.02 is used for pre-polymerization, and the polymerization method adopts batch polymerization. In step 3, EDA, PDA, and DEA mixed amines are used as chain extenders, and the ratio of amines is EDA:PDA 4:1 for chain extension. In step 4, ordinary hot air is used for spinning in a square tunnel, and the spinning air volume is 9Nm 3 / min; produce 40D standard spandex products under the above process conditions.

Embodiment 2

[0035] In step 1, the solvent uses 85PPM of moisture and 0.35μS / cm of conductance; DMF with an acid content of 75PPM. In step 2, PTG with a molecular weight of 2006 and a molecular weight distribution of 1.52 is used for pre-polymerization. The polymerization method adopts static mixing, and step 3 EDA, PDA, DEA mixed amines are used as chain extenders, and the ratio of amines is EDA:PDA 4:1 for chain extension. In step 4, ordinary hot air is used for spinning in a square tunnel, and the spinning air volume is 9Nm 3 / min; produce 40D standard spandex products under the above process conditions.

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Abstract

The present invention relates to dry-method spandex fiber suitable for a highly uniform spandex filament and a method for preparing the dry-method spandex fiber, and the method comprises the following steps: (1) in a polymerization solvent segment, different solvents are selected and solvent impurities are reduced to improve spandex product uniformity; (2) in a polymerization pre-polymerization segment, different materials and ratios are selected and small molecule impurities are reduced to improve the spandex product uniformity; (3) in a polymerization chain extension segment, different chain extension agents are selected to improve the spandex product uniformity; and (4) in a spinning process section, different spinning processes are selected to improve the spandex product uniformity. The coefficient of variation (CV) value of dynamic unwinding stress data of the spandex fiber prepared by the method is significantly-reduced compared with that of conventional spandex fiber, and spandex filament coil uniformity is improved significantly.

Description

technical field [0001] The invention relates to a dry-process spandex fiber suitable for high-uniformity spandex yarn and a preparation method thereof, belonging to the technical field of textiles. Background technique [0002] Spandex is a special textile fiber, which has been widely used in the fields of various covered yarns, circular knitting machines and warp knitted fabrics. At present, among all kinds of textiles using spandex, the fields that require high uniformity of spandex are high-end circular knitting machines and warp knitted fabrics. The uniformity of conventional spandex cannot meet the requirements for use. The most important data to measure the uniformity of spandex products is the variation coefficient CV value of the dynamic unwinding stress value data (variation coefficient C V = (standard deviation SD / average value MN) × 100%, and the testing equipment is the dynamic stress detector ST -80), the CV value of the detection data of domestic conventional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/78C08G18/66C08G18/48C08G18/32C08G18/10D01D10/06
Inventor 徐爱军吕柏松王子成
Owner ZHEJIANG KAIPUTE SPANDEX