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Preparation method of high-resilience low-draft differential melt-spun polyurethane filament

A high-resilience, spandex yarn technology, applied in melt spinning, rayon manufacturing, filament/thread forming, etc., can solve the problems of skinning pipes that are easy to adhere to the pipe wall, strength, resilience and temperature resistance , Difficult to clean and other problems, to achieve the effect of easy unwinding, high elastic recovery rate, and improved performance

Inactive Publication Date: 2015-05-06
ZHONGSHAN XINSHUN SPECIAL FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the current melt-spun spandex, since the cross-linking agent added during the manufacturing process is very easy to adhere to the skin inside the pipe wall and block the pipe, it is difficult to clean up and affect production. Therefore, the amount of cross-linking agent added in spandex production is generally controlled. The mass ratio of the chip is 8% to 13%, and the spandex produced by the melt spinning method has certain defects in terms of strength, resilience and temperature resistance.

Method used

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  • Preparation method of high-resilience low-draft differential melt-spun polyurethane filament

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The present invention is a method for preparing differentiated melt-spun spandex yarns with high resilience and low draft, and the specific steps are as follows:

[0022] 1. Cut an appropriate amount of thermoplastic polyurethane into slices and dry them at 85°C for 5 hours;

[0023] 2. Put the dried chips into the screw extruder for melting;

[0024] 3. Input the cross-linking agent with a proportion of 13% into the metering pump for metering, and then add it into the screw extruder through the booster pump;

[0025] 4. After the chips and the crosslinking agent are heated and melted through the fourth zone of the screw extruder at 100-220°C, they are added to the mixing pump to be mixed into a molten mixture;

[0026] 5. After the molten mixture in the mixing pump is pressed into the melt pipe in the spinning box, it is then distributed to the spinning metering pumps at different spinning positions and sent to the spinning assembly, and extruded to obtain a fine melt...

Embodiment 2

[0032] The present invention is a method for preparing differentiated melt-spun spandex yarns with high resilience and low draft, and the specific steps are as follows:

[0033] 1. Slice an appropriate amount of thermoplastic polyurethane and dry it at 87°C for 5.5 hours;

[0034] 2. Put the dried chips into the screw extruder for melting;

[0035] 3. Input the cross-linking agent with a ratio of 15% into the metering pump for metering, and then add it into the screw extruder through the booster pump;

[0036] 4. After the chips and the crosslinking agent are heated and melted through the fourth zone of the screw extruder at 100-220°C, they are added to the mixing pump to be mixed into a molten mixture;

[0037] 5. After the molten mixture in the mixing pump is pressed into the melt pipe in the spinning box, it is then distributed to the spinning metering pumps at different spinning positions and sent to the spinning assembly, and extruded to obtain a fine melt. flow;

[00...

Embodiment 3

[0043] The present invention is a method for preparing differentiated melt-spun spandex yarns with high resilience and low draft, and the specific steps are as follows:

[0044] 1. Slice an appropriate amount of thermoplastic polyurethane and dry it at 88°C for 5.8 hours;

[0045] 2. Put the dried chips into the screw extruder for melting;

[0046] 3. Input the cross-linking agent with a ratio of 16% into the metering pump for metering, and then add it into the screw extruder through the booster pump;

[0047] 4. After the chips and the crosslinking agent are heated and melted through the fourth zone of the screw extruder at 100-220°C, they are added to the mixing pump to be mixed into a molten mixture;

[0048] 5. After the molten mixture in the mixing pump is pressed into the melt pipe in the spinning box, it is then distributed to the spinning metering pumps at different spinning positions and sent to the spinning assembly, and extruded to obtain a fine melt. flow;

[00...

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Abstract

The invention relates to a method for preparing a high-resilience low-draft differential melt-spun polyurethane filament. According to the preparation method provided by the invention, in the process of producing a thermoplastic polyurethane filament, the proportion of a cross-linking agent component is improved, oil yield of an oiling agent in the process of producing the thermoplastic polyurethane filament is improved and head shrinkage of the filament in the winding and forming process is improved; in the preparing process, no harmful solvent is used and no pollution gas is discharged; compared with a common thermoplastic polyurethane filament, the thermoplastic polyurethane filament prepared by the method has the characteristics of high single-filament strength, high elastic recovery rate, temperature resistance and easiness for backing-off.

Description

【Technical field】 [0001] The invention relates to a method for manufacturing chemical fibers, in particular to a method for preparing differentiated heat-shrinkable polyurethane filaments with high resilience and low draft. 【Background technique】 [0002] Melt-spun spandex, also known as thermoplastic polyurethane elastic fiber, is also referred to as spandex in China. [0003] It is an elastic fiber obtained by crosslinking thermoplastic polyurethane chips by adding a crosslinking agent in the melt spinning process, and has the elasticity similar to rubber silk. [0004] For the current melt-spun spandex, because the cross-linking agent added during the manufacturing process is very easy to adhere to the skin inside the pipe wall and block the pipe, it is difficult to clean up and affect production. Therefore, the amount of cross-linking agent added in spandex production is generally controlled. The mass ratio of the chips is 8% to 13%, and the spandex produced by the melt...

Claims

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Application Information

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IPC IPC(8): D01D5/08D01D5/088D01D5/34D01F6/94D01F1/10
Inventor 王建新
Owner ZHONGSHAN XINSHUN SPECIAL FIBER
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