A kind of preparation method of anti-scattering polyurethane elastic fiber

A polyurethane elastic and anti-loosening technology, which is applied in fiber treatment, fiber chemical characteristics, rayon manufacturing, etc., can solve the problem of easy adhesion of melt-spun spandex, poor unwinding performance, and spandex's inability to combine hot-melt adhesion and excellent Mechanical properties and other issues, to achieve good heat resistance and high temperature resistance, prevent further expansion, and inhibit off-line effects

Active Publication Date: 2019-02-22
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technical method successfully solves the contradictory problem that spandex cannot have both good hot-melt adhesiveness and excellent mechanical properties through the mixed use of two polyurethanes with different high and low melting points; through the implementation of low-temperature and low-speed spinning process, it solves the problem of easy adhesion of melt-spun spandex , poor unwinding, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] 1). Preparation of high melting point polyurethane

[0026] Heat the diisocyanate to 50-80 degrees to fully melt, and at the same time heat and mix the polyether diol and the small molecule diol. These materials are injected into the feeding area of ​​the twin-screw extruder according to the proportion, and after being fully mixed and reacted in the high-temperature mixing area, they are extruded through the screw and enter the underwater pelletizer to make granular solids. The granular solid is dehydrated and dried with a dryer, and heat-cured at a temperature of 80-120 degrees to obtain high-melting-point polyurethane.

[0027] 2). Preparation of low melting point polyurethane

[0028] Heat diisocyanate to 50-80 degrees to fully melt, and at the same time heat and mix polyester diol, small molecule diol and small molecule monohydric alcohol. These materials are injected into the feeding area of ​​the twin-screw extruder according to the proportion, and after being f...

Embodiment 1

[0044] Heat MDI to 50 degrees to fully melt, heat and mix PTMG2000 with ethylene glycol (EG) and hydroquinone bishydroxyethyl ether (HQEE). These materials are injected into the feeding zone of the twin-screw extruder in proportion, and the molar ratio of MDI, PTMG, EG, and HQEE is 1.05 / 0.5 / 0.4 / 0.1. After these materials are fully mixed and reacted in the 160-degree mixing zone, they are extruded through the screw and enter the underwater pelletizer to make granular solids. After drying to remove water, place it at a temperature of 80 degrees for 8 hours of heat aging treatment to obtain high melting point polyurethane.

[0045] Heat MDI to 50 degrees to fully melt, heat and mix PBA2000, 1,4-butanediol (BDO) and methanol (MT). These materials are injected into the feeding zone of the twin-screw extruder in proportion, the molar ratio of MDI, PBA, and BDO is 0.9 / 0.7 / 0.35, and the amount of MT is 500ppm of the molar amount of MDI. After these materials are fully mixed and reac...

Embodiment 2

[0048] Heat IPDI to 58 degrees to fully melt, heat and mix PTMG2000, BDO and hydroquinone bishydroxyethyl ether (HQEE). These materials are injected into the feeding zone of the twin-screw extruder in proportion, and the molar ratio of IPDI, PTMG, BDO, and HQEE is 1.10 / 0.6 / 0.2 / 0.2. . After these materials are fully mixed and reacted in the 160-degree mixing zone, they are extruded through the screw and enter the underwater pelletizer to make granular solids. After drying to remove water, place it at 100°C for 6 hours of thermal aging treatment to obtain high melting point polyurethane.

[0049] Heat MDI to 50 degrees to fully melt, heat and mix PEA2000, 1,4-butanediol (BDO) and n-propanol (NPA). These materials are injected into the feeding zone of the twin-screw extruder in proportion, the molar ratio of MDI, PEA, and BDO is 0.95 / 0.55 / 0.45, and the amount of NPA is 800ppm of the molar amount of MDI. After these materials are fully mixed and reacted in a 140-degree mixing z...

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Abstract

A preparation method for a raveling-resistant polyurethane elastic fiber comprises the steps: firstly, two kinds of polyurethane having different melting points are prepared by a twin-screw extruder, the melting temperature of the high-melting-point polyurethane is 190-230 DEG C, and the melting temperature of the low-melting-point polyurethane is 90-130 DEG C; then the two kinds of polyurethane are molten and mixed with a plasticizer, an anti-adhesion agent, a cross-linking agent and the like in proportion; the evenly-mixed high-temperature melt forms a nascent fiber through a metering pump, a filter and a spinneret plate; the nascent fiber is cooled by cooling circulation wind, is oiled and drawn with the aid of a roller, and is spun and molded at relatively low spinning speed; and the molded wire coil is subjected to heat curing treatment, and finally the raveling-resistant polyurethane elastic fiber is obtained.

Description

technical field [0001] The invention belongs to a method for preparing polyurethane elastic fibers, in particular to a method for preparing polyurethane elastic fibers with an anti-scattering effect. Background technique [0002] Anti-scattering spandex, also known as low-temperature heat-bonding spandex or low-melting point spandex, is a new type of spandex product that is gradually emerging in the market. The performance characteristic of this product is that it is heated and melted in the process of dyeing or heat setting, so as to realize the mutual bonding of spandex yarn and spandex yarn or spandex yarn and other fibers, so as to effectively prevent the spandex fabric from being scratched, cut and stretched repeatedly. Cause silk thread to loosen, burr, curl. Products on the market include Mobilon from Japan's Nisshinbo Corporation, Roica SF from Asahi Kasei Corporation, and Lycar Fusion from Invista Corporation of the United States. [0003] The key to preparing the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/16D01F1/10D01D5/092C08G18/48C08G18/32C08G18/66C08G18/42
CPCC08G18/3206C08G18/3215C08G18/4238C08G18/4854C08G18/664C08G18/6674D01D5/092D01F1/10D01F8/16
Inventor 许图远杨晓印梁红军王靖陈厚翔周志伟
Owner ZHEJIANG HUAFENG SPANDEX
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