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Polyurethane-nylon 6 block copolymer, preparation method thereof and polyurethane-nylon 6 elastic fiber

A technology of block copolymer and polyurethane oligomer, applied in polyurethane-nylon 6 block copolymer and its preparation, polyurethane-nylon 6 elastic fiber field, can solve the problem of low efficiency, unsuitable melt spinning fiber, low tension Tensile strength and other issues, to achieve the effect of improving performance, overcoming structural stability and controllability, and good elasticity

Active Publication Date: 2020-12-25
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method directly melts and blends polyurethane and nylon in the extruder, and the efficiency of the copolymerization reaction is low
And above-mentioned two kinds of preparation methods have only obtained nylon polyurethane elastomer, and its tensile strength is less than 30MPa, is far lower than the tensile strength of practical polyamide fiber or spandex, and does not start from the melt spinning of polyurethane-nylon 6 copolymer From the perspective of performance, the molecular structure is designed and regulated, so the obtained product is not suitable for the preparation of melt-spun fibers

Method used

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  • Polyurethane-nylon 6 block copolymer, preparation method thereof and polyurethane-nylon 6 elastic fiber
  • Polyurethane-nylon 6 block copolymer, preparation method thereof and polyurethane-nylon 6 elastic fiber
  • Polyurethane-nylon 6 block copolymer, preparation method thereof and polyurethane-nylon 6 elastic fiber

Examples

Experimental program
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Effect test

preparation example Construction

[0042] A kind of preparation method of polyurethane-nylon 6 block copolymer described above, comprises the following steps:

[0043] S1. Weigh the diisocyanate and polyether polyol at a molar ratio of 1.05:1 to 1.25:1, dry the polyether polyol under reduced pressure, add diisocyanate and catalyst dibutyltin dilaurate (DBTDL), at room temperature Reaction preset time, obtains isocyanate-terminated polyurethane prepolymer; Preparation reaction formula is as follows:

[0044]

[0045] Wherein R is one or more of hexamethylene, diphenylmethane, and methanephenyl, and R' is one or more of polyethylene glycol, polypropylene glycol, and polytetramethylene glycol.

[0046] S2. Add low-molecular-weight aliphatic diols to the isocyanato-terminated polyurethane prepolymer described in step S1, and continue to react at room temperature for a preset time to obtain an isocyanato-terminated polyurethane oligomer;

[0047] The molar ratio of the isocyanate-terminated polyurethane prepolym...

Embodiment 1

[0061] A polyurethane-nylon 6 elastic fiber is obtained by melt spinning of a polyurethane-nylon 6 block copolymer, and the preparation method of the polyurethane-nylon 6 block copolymer comprises the following steps:

[0062] (1) Preparation of isocyanate-terminated polyurethane prepolymer: According to n(NCO):n(OH)=1.1:1, weigh toluene diisocyanate and polypropylene glycol respectively, add polypropylene glycol into a three-necked flask, and heat at 110°C After drying under reduced pressure for 2 hours, lower it to room temperature, add toluene diisocyanate and catalyst (DBTDL), and react at constant temperature for 3 hours to obtain an isocyanate-terminated polyurethane prepolymer.

[0063] (2) Preparation of isocyanate-terminated polyurethane oligomer: with ethylene glycol as a chain extender, add ethylene glycol (the isocyanate-terminated polyurethane prepolymer in step (1) The molar ratio of the base polyurethane prepolymer to the low molecular weight aliphatic diol is 1...

Embodiment 2 and 3 and comparative example 1 and 2

[0069] The polyurethane-nylon 6 elastic fibers provided in Examples 2 and 3 and Comparative Examples 1 and 2 are obtained by melt spinning of polyurethane-nylon 6 block copolymers. Compared with Example 1, the difference is that polyurethane-nylon In the preparation step (4) of 6 block copolymers, the molar ratio of the amino-terminated polycaprolactam prepolymer and the isocyanate-terminated polyurethane oligomer and the corresponding melt-spinning temperature are as shown in Table 1, and others are the same as in the examples 1 are basically the same and will not be repeated here.

[0070] Preparation conditions and test results of table 1 embodiment 2 and 3 and comparative examples 1 and 2

[0071]

[0072] As can be seen from Table 1, the smaller the mol ratio of the amino-terminated polycaprolactam prepolymer and the isocyanate-terminated polyurethane oligomer, the higher the molecular weight of the resulting copolymer, and the higher the mass fraction of the polyureth...

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Abstract

The invention provides a polyurethane nylon 6 block copolymer, a preparation method thereof and a polyurethane nylon 6 elastic fiber. The polyurethane nylon 6elastic fiber is obtained by performing melt spinning on the polyurethane nylon 6 block copolymer. The polyurethane nylon 6 block copolymer is an ABA type block copolymer, wherein the block A is an amino-terminated polyamide chain segment, the block B is an isocyanate-terminated polyurethane chain segment, the mass content of the isocyanate-terminated polyurethane chain segment is 20-60wt%, and amino-terminated polyamide and isocyanate-terminated polyurethane are subjected to polymerization reaction according to a molar ratio of 1.2:1 to 1.3:1 by adopting a hydrolytic polymerization method. The molecular structure of the polyurethane-nylon 6 copolymer is designed, so that the copolymer has excellent properties of polyurethane and nylon, copolymer slices meeting melt spinning requirements are obtained, and the polyurethane-nylon 6copolymer elastic fiber with high strength and high resilience is obtained through melt spinning.

Description

technical field [0001] The invention belongs to the technical field of polymer materials and synthetic fibers, and in particular relates to a polyurethane-nylon 6 block copolymer, a preparation method thereof and a polyurethane-nylon 6 elastic fiber. Background technique [0002] Polyurethane elastic fiber, commonly known as spandex, is usually a block copolymer of polyester or polyether with hydroxyl groups at the end and aromatic diisocyanate. Its main chain contains more carbamate groups (-NHCOO-), and there are alternating soft segments and hard segments inside, of which the hard segment is usually isocyanate, polyol terminal hydroxyl group and small molecule chain extender ( Diols or diamines) are formed by reaction, and the soft segment is usually a polyether or polyester oligomer with a relatively low molecular weight (usually the molecular weight is controlled at 500-3000g / mol) containing terminal hydroxyl groups. The soft segment is not crystalline and is easily de...

Claims

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Application Information

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IPC IPC(8): D01F6/96C08G18/10C08G18/66C08G18/48C08G18/32C08G18/60
CPCD01F6/96C08G18/10C08G18/6674C08G18/4833C08G18/4854C08G18/4825C08G18/603C08G18/4054C08G18/3206
Inventor 王雯雯王栋田时友赵青华周鹏程卢静梅涛
Owner WUHAN TEXTILE UNIV
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