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Processing method for improving strength of polyurethane filaments

A technology of spandex filament and processing method, which is applied in the field of textile processing, and can solve problems such as the inability to effectively improve the uneven tension of the filament-wrapped spandex yarn, the inability to control the elastic elongation of the spandex, and the unevenness of the fabric surface, so as to improve the tension Unevenness, improvement of draft unevenness, and short processing time

Active Publication Date: 2019-08-27
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it needs to greatly improve the sizing machine, and the transformation process is complicated. When it is used for elastic spandex sizing, it cannot control the elastic elongation of spandex and control the yarn tension. In the process of spandex sizing, it is easy to cause uneven sizing.
In the invention patent of the sizing process of cotton-polyester blended fabric yarn, the strength of the yarn is significantly improved after sizing, and the yarn has good elongation performance, but the disadvantage is that there are too many ingredients in the slurry and the operation process is complicated. It is easy to cause uneven sizing when it is used for elastic spandex sizing
[0005] At present, the sizing process of elastic spandex yarn takes a long time, and the sizing conditions will cause a certain elastic loss of spandex. At the same time, it is impossible to control the uneven pre-elongation during the sizing process, which is caused by the inconsistent elongation rate of the yarn during the sizing process. The uneven sizing cannot effectively improve the uneven tension of the filament-wrapped spandex yarn, which affects the subsequent processing process and causes the fabric surface to be uneven after desizing

Method used

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  • Processing method for improving strength of polyurethane filaments
  • Processing method for improving strength of polyurethane filaments
  • Processing method for improving strength of polyurethane filaments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A processing method for improving the strength of spandex filaments, comprising the steps of:

[0040] Preparation of S1 slurry: Pour water into a 500mL mixing bucket and heat it to 80°C in a water bath. Slowly add polyvinyl alcohol, sodium lauryl alcohol polyoxyethylene ether sulfate surfactant and softener while stirring at 80°C, 500r / min stirring for 4h until the polyvinyl alcohol is dissolved to obtain a slurry, wherein the mass fraction of polyvinyl alcohol is 10%, the mass fraction of surfactant is 1%, and the concentration of softening agent is 1%;

[0041] S2 Pre-drawing of spandex filaments: 270 denier spandex filaments are passed through two pairs of drafting rollers to obtain pre-drawing spandex filaments, wherein the speed of the first pair of drafting rollers is 50m / min, and the speed of the second pair of drafting rollers is 50m / min. The speed of the roller is 150m / min, and the draft ratio of the spandex filament is 3 times;

[0042] S3 Moist heat treatm...

Embodiment 2-11

[0048] Embodiment 2-11 provides a kind of processing method for improving the strength of spandex filament, compared with embodiment 1, the difference is that the mass fraction of polyvinyl alcohol and surfactant in step S1 is changed, and the concentration of softening agent, specifically The dosage is shown in Table 2.

[0049] Table 2

[0050]

[0051] The strength performance parameters of the PVA sizing spandex obtained in Examples 1-11 were compared, and the results are shown in Table 2.

[0052] The strength performance data of the PVA sizing spandex of Examples 2-5 are shown in Table 2. From the results in the table, it can be known that the greater the mass fraction of polyvinyl alcohol, the greater the elongation at break and the strength at break.

[0053] The strength performance data of the PVA sizing spandex of Example 3 and Examples 6-8 are shown in Table 2. From the results in the table, it can be seen that the greater the mass fraction of surfactant, the g...

Embodiment 12-19

[0057] Embodiments 12-19 provide a processing method for improving the strength of spandex filaments. Compared with Embodiment 1, the difference is that the stirring temperature, stirring time and stirring rate in step S1 are changed. The specific methods are shown in Table 3.

[0058] table 3

[0059]

[0060] The strength performance parameters of the PVA sizing spandex obtained in Examples 12-19 were compared, and the results are shown in Table 3.

[0061] The strength performance data of the PVA sizing spandex in Examples 12-13 are shown in Table 3. From the results in the table, it can be seen that the elongation at break and the strength at break also increase as the stirring temperature increases.

[0062] The results of the strength performance data of the PVA sizing spandex of Examples 13-16 are shown in Table 3. From the results in the table, it can be seen that the elongation at break and the strength at break increase as the stirring time increases.

[0063] Th...

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Abstract

The invention relates to a processing method for improving the strength of polyurethane filaments. The processing method comprises the following steps of first dissolving polyvinyl alcohol in water, preparing size under a certain condition, then performing pre-drawing on elastic polyurethane filaments, dipping the polyurethane filaments in a size vat for dipping, performing wet-heat processing, passing through a compression roller and then braking, curing polyvinyl alcohol to form a film, and putting the polyurethane filaments in water for washing, thereby obtaining the strength-improved polyurethane filaments. The wet-heat processing method is simple to operate, low in raw material cost, and short in processing time consumed, the elastic polyurethane filaments are processed on a common slasher, and meanwhile, the bad influence on subsequent processing, caused by non-uniform tension due to non-uniform polyurethane filament elasticity and elasticity loss, is improved.

Description

technical field [0001] The invention belongs to the technical field of textile processing, and in particular relates to a processing method for improving the strength of spandex filaments. Background technique [0002] Spandex is highly elastic and can be stretched to 6-7 times itself. However, with the disappearance of the applied tension, spandex can quickly return to its original state. Its molecular structure is a chain-like, soft and extensible polyamino Formate, which enhances its properties by attaching hard segments together. In the production process of textiles, spandex is generally not used alone, but mixed into fabrics in a small amount. Spandex fiber has both rubber properties and fiber properties. Most of them are used for core-spun yarns with spandex as the core yarn, called elastic core-spun yarns. The main characteristics of this yarn are that it can obtain good feel and appearance, and The outer fiber composed of natural fibers has good hygroscopicity; th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06B3/04D06B15/00D06B23/20D06B23/22D02J1/22D06M15/333D06M101/30
CPCD02J1/22D06B3/045D06B15/00D06B23/20D06B23/22D06M15/333D06M2101/38D06M2200/40
Inventor 徐卫林周思婕付专毛云山王运利夏良君
Owner WUHAN TEXTILE UNIV
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