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A kind of preparation method of high-strength, high-modulus and high-elasticity polyurethane fiber

A polyurethane fiber, high-strength and high-modulus technology, which is applied in the field of fiber materials, can solve problems such as the difficulty in realizing polyurethane fibers and the decrease in elasticity, and achieve the effects of low cost, enhanced Young's modulus, and broadened application fields

Active Publication Date: 2017-10-20
WUHAN TEXTILE UNIV
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Problems solved by technology

[0004] The above method of enhancing the tensile mechanical properties of polyurethane fibers is designed and implemented from the aspects of molecular structure, intermolecular force, aggregation state and adding reinforcements. It is a process of modifying polyurethane fibers into rigid fibers. The rigidity of polyurethane fibers An increase will lead to a decrease in its elasticity
Therefore, the above method of enhancing the tensile mechanical properties of polyurethane fibers can only effectively increase its breaking strength and Young's modulus, but it is difficult to achieve the three mechanical indicators of polyurethane fibers in terms of breaking strength, Young's modulus and elongation at break. purpose of increasing

Method used

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  • A kind of preparation method of high-strength, high-modulus and high-elasticity polyurethane fiber

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preparation example Construction

[0031] A preparation method of high-strength, high-modulus and high-elasticity polyurethane fiber, described preparation method is carried out according to the following steps:

[0032] a Polyurethane spinning solution preparation

[0033] Put one of polyether polyurethane or polyester polyurethane or polyester-polyether polyurethane into N,N-dimethylformamide with a mass fraction of 98% to 99%, and the room temperature is 8-38 Mechanical stirring at ℃ for 0.5-1 h and vacuum defoaming to obtain polyether polyurethane spinning solution or polyester polyurethane spinning solution with solid content of 10-25% and dynamic viscosity of 300-20000 mPa·s or One of the polyester-polyether polyurethane spinning solutions, wherein the stirring rate is 800-3000r / min.

[0034] b coagulation bath preparation

[0035] According to the following mass percentage:

[0036] Deionized water 15~97.5%

[0037] Ammonium salt 1~70%

[0038] Polar solvent containing amide bond 0.5~10%

[0039] A...

Embodiment 1

[0048] a Polyurethane spinning solution preparation

[0049] Put polyether polyurethane into N,N-dimethylformamide with a mass fraction of 98%, mechanically stir it at room temperature for 0.5 h, and then vacuum defoam to obtain solid content of 10%, dynamic viscosity 300mPa·s polyether polyurethane spinning solution, wherein the stirring rate is 800r / min.

[0050] b coagulation bath preparation

[0051] 70g ammonium nitrate, 10g formamide, 4.5g acetone, and 0.5g relative molecular weight are 200 sulfate ester surfactants into 15g deionized water with a conductivity of 16MΩ cm to obtain a mixed solution, then the temperature of the mixed solution After raising to 25° C. and stirring mechanically for 3 hours, a coagulation bath was obtained, wherein the stirring rate was 800 r / min.

[0052] c Wet drawing forming

[0053] Extrude the polyether polyurethane spinning solution prepared in step a through a spinneret hole with a diameter of 65 μm and a length of 1 mm, and pass thr...

Embodiment 2

[0057] a Polyurethane spinning solution preparation

[0058] Put the polyester polyurethane into N,N-dimethylformamide with a mass fraction of 99%, mechanically stir it for 1 h at room temperature at 18°C, and then vacuum defoam to obtain a solid content of 15% and a dynamic viscosity It is a polyester polyurethane spinning solution of 3000mPa·s, wherein the stirring rate is 1200r / min.

[0059] b coagulation bath preparation

[0060] Put 60g of ammonium chloride, 8gN, N-dimethylformamide, 1.5g of acetone and 0.5g of sulfonate surfactant with a relative molecular weight of 400 into 30g of deionized water with a conductivity of 15MΩ cm to obtain a mixed solution, Then the temperature of the mixed solution was increased to 50° C. and mechanically stirred for 4 hours to obtain a coagulation bath, wherein the stirring rate was 1100 r / min.

[0061] c Wet drawing forming

[0062] Extrude the polyester polyurethane spinning solution prepared in step a through a spinneret hole with ...

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Abstract

The invention relates to a preparation method of high-strength, high-modulus and high-elasticity polyurethane fiber, belonging to the technical field of fiber materials. The preparation method of a high-strength, high-modulus and high-elasticity polyurethane fiber of the present invention is that after the polyurethane spinning solution is extruded through the spinneret holes, the polyurethane spinning solution is passed through deionized water, ammonium salt, organic solvent containing amide bonds, acetone with a long solidification distance. In a coagulation bath mixed with a low relative molecular weight anionic surfactant, wet drawing molding and heat treatment are carried out to obtain high-strength, high-modulus and high-elastic polyurethane fibers. The preparation method of the present invention realizes simultaneous enhancement of the breaking strength, Young's modulus and elongation at break of the polyurethane fiber, and the breaking strength of the polyurethane fiber prepared by the present invention increases by 150-280%, and the elongation at break increases by 60-120% , Young's modulus increased by 50‑160%. The preparation method of the invention has simple process equipment, low cost, no pollution to the ecological environment, high controllability and great application prospects.

Description

technical field [0001] The invention relates to a preparation method of high-strength, high-modulus and high-elasticity polyurethane fiber, belonging to the technical field of fiber materials. Background technique [0002] Polyurethane is mainly formed by the polyaddition reaction of diisocyanate or polyisocyanate with dihydroxy or polyhydroxy compounds. It has excellent properties such as high elasticity, wear resistance, low temperature resistance, solvent resistance and aging resistance, so it is widely used in various fields of national economy. Due to the good solubility of polyurethane materials in N,N-dimethylformamide, N,N-dimethylacetamide and dimethyl sulfoxide, polyurethane fibers can be prepared by wet spinning, which is widely used. Wide range of applications in leather, sofas, shoes and hats, automotive interiors, decorations, tracks and other fields. [0003] With the expansion of the application field of polyurethane fiber, people put forward higher require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/06D01F6/70D01D4/02
Inventor 刘欣唐运容徐卫林王栋曹根阳李文斌杨锴张科
Owner WUHAN TEXTILE UNIV
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