Preparation method of high-tenacity polyurethane composite fiber

A composite fiber and polyurethane technology, which is applied in the direction of fiber chemical characteristics, single-component synthetic polymer rayon, rayon manufacturing, etc., can solve the problems of reinforcement, polyurethane composite fiber functionality and mechanical properties, etc., to improve the combination The effect of strength, good toughness and good mechanical properties

Active Publication Date: 2019-09-13
WUHAN TEXTILE UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the shortcomings that the functional and mechanical properties of polyurethane composite fibers prepared by the prior art cannot be balanced, the purpose of the present invention is to provide a preparation method of high-toughness polyurethane composite fibers, in which polyurethane prepolymer and filler particles are dissolved in a mixed solvent containing toluene In this method, the swelling property of toluene on the polyurethane prepolymer is used to change the conformation of the polyurethane molecular chain in the solvent, thereby improving the binding force between the filler particles and the polyurethane molecules. When the filler particles are added up to 50%, the polyurethane composite fiber still has Better mechanical properties and significantly enhanced functionality

Method used

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  • Preparation method of high-tenacity polyurethane composite fiber
  • Preparation method of high-tenacity polyurethane composite fiber
  • Preparation method of high-tenacity polyurethane composite fiber

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preparation example Construction

[0029] A preparation method of high-toughness polyurethane composite fiber, said preparation method comprising the following steps:

[0030] S1. Spinning solution preparation: mix toluene with a mass fraction ratio of 10%: 90% to 45%: 55% and a good polyurethane solvent to form a binary mixed solvent, and then adjust the mass fraction ratio to 95%: 5% to 50%. : 50% polyether polyurethane prepolymer and filler particles are placed in a binary mixed solvent, mechanically stirred at a speed of 400-800r / min at room temperature for 60-120min, and vacuum defoamed to prepare a solid content of 15wt% spinning solution;

[0031] S2. Coagulation bath preparation: the mass fraction ratio is 100%:0%~90%:10% deionized water and ethanol are formulated into coagulation bath, and coagulation bath temperature is 25~35 ℃;

[0032] S3. Spinning and post-processing: Add the prepared spinning solution into the wet spinning machine, extrude at a speed of 15-25ml / h, immerse in a coagulation bath at...

Embodiment 1

[0035] A kind of preparation method of high tenacity polyurethane composite fiber provided by embodiment 1, comprises the following steps:

[0036]S1. Spinning solution preparation: the mass fraction ratio is 40%: 60% toluene and N, N-dimethylformamide compounded into a binary mixed solvent, and then the mass fraction ratio is 70%: 30% poly The ether type polyurethane prepolymer and superfine silk fibroin powder are placed in a binary mixed solvent, mechanically stirred at a speed of 400-800r / min at room temperature for 60-120min, and vacuum defoamed to prepare a solid content of 15wt%. spinning solution;

[0037] S2. Coagulation bath preparation: the mass fraction ratio is 98%: 2% deionized water and ethanol are prepared into a coagulation bath, and the coagulation bath temperature is 30° C.;

[0038] S3. Spinning and post-processing: Add the prepared spinning solution into the wet spinning machine, extrude it at a speed of 20ml / h, immerse it in a coagulation bath at a tempe...

Embodiment 2～7

[0040] Compared with Example 1, Examples 2-7 differ in the ratio of toluene to N,N-dimethylformamide mass fraction and the mass fraction of polyether polyurethane prepolymer and superfine silk fibroin powder such as Shown in table 1, other are all identical with embodiment 1.

[0041] Table 1 Example 2~7 solvent and polyether type polyurethane prepolymer and superfine silk fibroin powder mass fraction ratio

[0042] Example Toluene: N,N-Dimethylformamide Polyether polyurethane prepolymer: superfine silk fibroin powder 2 10％:90％ 70％:30％ 3 25％:75％ 70％:30％ 4 45％:55％ 70％:30％ 5 40％:60％ 95％:5％ 6 40％:60％ 90％:10％ 7 40％:60％ 50％:50％

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Abstract

The invention discloses a preparation method of high-tenacity polyurethane composite fiber. The high-tenacity polyurethane composite fiber is prepared by adopting a solution spinning method, and comprises the steps of preparation of a spinning solution, preparation of coagulating bath, spinning and aftertreatment, wherein the preparation of a spinning solution adopts a mixed solvent method; methylbenzene and a good solvent of polyurethane are mixed, so as to obtain a binary mixed solvent; then polyurethane prepolymer and filler particles are added into the binary mixed solvent according to a certain mass ratio; the polyurethane prepolymer and the filler particles are mechanically mixed to be uniform and then are subjected to vacuum defoamation, so that a polyurethane composite fiber spinning solution with the solid content being 15 percent is formed; the spinning solution is extruded in a wet spinning frame, is cooled and formed through the coagulating bath, and is finally subjected tothermal treatment, so that the high-tenacity polyurethane composite fiber is obtained. The method obviously improves the interfacial compatibility between the filler particles and polyurethane through the preparation of the mixed solvent containing methylbenzene, so that structure regulation to polyurethane is realized, and the high-tenacity polyurethane composite fiber with an excellent functionis obtained.

Description

technical field [0001] The invention belongs to the technical field of fiber material preparation, and in particular relates to a preparation method of high-toughness polyurethane composite fiber. Background technique [0002] Polyurethane fiber is a highly elastic synthetic fiber, and its elasticity can reach more than 800%. Traditional polyurethane fibers have disadvantages such as poor heat resistance, poor antistatic property and poor UV resistance, which limit the application of polyurethane fibers. In order to overcome the above shortcomings, research has found that adding organic or inorganic filler particles to polyurethane can overcome the limitations of polyurethane materials, so that the prepared materials have both the characteristics of polyurethane and the characteristics of filler particles. Among them, organic materials such as various wool, silk fibroin and other natural fibers are mostly used in the filling of polyurethane to enhance the hygroscopicity and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/94D01F1/10
CPCD01F6/94D01F1/10
Inventor 刘欣王云张春华李晨向鑫张科徐卫林
Owner WUHAN TEXTILE UNIV
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