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Preparation method of polyether ester type melt-spun spandex slices

A technology of polyether ester and melt spinning, applied in textiles and papermaking, single-component synthetic polymer rayon, fiber chemical characteristics, etc., can solve the problem of inability to guarantee the uniformity, controllability, mechanical strength, and heat resistance of the reaction system Resilience decreases, different reaction rates of isocyanates, etc., to achieve the effect of high molecular weight, narrow molecular weight distribution, and uniform reaction system

Pending Publication Date: 2022-03-25
YANTAI TAYHO ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyether polyols with different molecular weights and polyε-caprolactone polyols have poor compatibility when they are simply mixed, and the reaction rate is different from that of isocyanate, which cannot guarantee the uniformity and controllability of the reaction system, which is likely to cause wide molecular weight distribution and lead to mechanical strength. , Heat resistance, and resilience decrease, which is not conducive to product quality control

Method used

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  • Preparation method of polyether ester type melt-spun spandex slices
  • Preparation method of polyether ester type melt-spun spandex slices
  • Preparation method of polyether ester type melt-spun spandex slices

Examples

Experimental program
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Effect test

preparation example Construction

[0022] A method for preparing polyether ester type melt-spun spandex chips, the polyether ester type melt-spun spandex chips first use polyether polyol as an initiator to initiate ring-opening polymerization of ε-caprolactone to form polyether-ε -Caprolactone polyol, then add small molecule chain extender and isocyanate to the twin-screw reaction extruder at a molar ratio of 1:(0.5~3.7):(1.5~5.3) for extruding and manufacturing Granules, dried.

[0023] Wherein, the number average molecular weight of the polyether-ε-caprolactone polyol is 1000~3000; the preparation method of the polyether-ε-caprolactone polyol comprises the following steps:

[0024] A. The polyether polyol is dewatered under vacuum at 100-150°C, and the ε-caprolactone raw material is dewatered under vacuum at 90-110°C, until the moisture content is below 500ppm.

[0025] B. Add polyether polyol and ε-caprolactone with a molar ratio of 1:(3~18) to remove water into the reactor, stir evenly at 120°C, add 50~500...

Embodiment approach

[0030] The test methods or test methods described in the following examples, unless otherwise specified, are conventional methods; the reagents and materials, unless otherwise specified, are obtained from conventional commercial channels or prepared by conventional methods.

[0031] The molecular weight described in the present invention is the number average molecular weight. Before the raw materials are used, water is removed under reduced pressure to a moisture content below 500 ppm, and parts by mass are used in the following examples.

Embodiment 1

[0033] Add 65 parts of polytetrahydrofuran ether diol (molecular weight 650) and 35 parts of ε-caprolactone into the reactor, stir well at 120°C, add 50ppm tetrabutyl titanate, blow nitrogen, raise the temperature to 160°C for 4 hours, and the acid value 0.45mgKOH / g, the acid value was 0.12mgKOH / g after vacuuming for 4 hours, and the reaction was completed to obtain polytetrahydrofuran ether-ε-caprolactone diol with a molecular weight of 1000.

[0034] Inject 70 parts of the obtained polytetrahydrofuran ether-ε-caprolactone diol, 3.8 parts of 1,6-hexanediol, and 26.2 parts of 4,4'-diphenylmethane diisocyanate into the twin-screw extruder with a metering pump In the machine, after extrusion at 190°C, it is pelletized underwater, dried, and packaged to obtain the product.

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Abstract

The invention discloses a preparation method of a polyether ester type melt spinning spandex slice, which comprises the following steps: firstly, by taking polyether polyol as an initiator, initiating epsilon-caprolactone to be subjected to ring opening polymerization to form polyether-epsilon-caprolactone polyol, then adding the polyether-epsilon-caprolactone polyol, a micromolecule chain extender and isocyanate into a double-screw reaction extruder, and carrying out extrusion granulation to obtain the polyether ester type melt spinning spandex slice. The melt-spun spandex slice prepared by the method has the comprehensive advantages of polyester type polyurethane and polyether type polyurethane, the reaction process is uniform and high in controllability, the product has the characteristics of high molecular weight and narrow molecular weight distribution, and the problems of poor compatibility, non-uniform reaction rate and the like of physical mixing use of poly epsilon-caprolactone polyol and polyether polyol are solved; and the spandex filament melt-spun by the slice has the characteristics of high molecular weight and narrow molecular weight distribution, and the spandex filament melt-spun by the slice has the advantages of high strength, good rebound resilience and good heat resistance.

Description

technical field [0001] The invention relates to the field of spandex preparation, in particular to a method for preparing polyether ester melt-spun spandex slices. Background technique [0002] As a highly elastic fiber, spandex has the characteristics of rapid rebound, high elastic recovery rate and strong adaptability. It can be used in combination with other fibers to make various elastic fabrics. Clothing made of this kind of elastic fabric is comfortable to wear, has no sense of pressure or restraint on the body, and has good shape retention, drape and wrinkle resistance, and is widely used in the textile industry. [0003] Spandex can be prepared by dry spinning and melt spinning. Among them, the melt spinning process is relatively simple, the equipment investment is small, and the production efficiency is high, especially the green and environmental protection characteristics without solvents. Today, the requirements for environmental protection and sustainable develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/32D01F6/78
CPCC08G18/664C08G18/4244C08G18/3206D01F6/78
Inventor 王京玉潘靖恺贾秋梓
Owner YANTAI TAYHO ADVANCED MATERIALS CO LTD
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