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Polyvinyl alcohol nanofiber, and preparation method and device thereof

A technology of nanofibers and polyvinyl alcohol, which is applied in fiber treatment, fiber chemical characteristics, rayon manufacturing, etc., can solve the problems that the breaking strength needs to be improved, so as to improve the spinnability, increase the tensile strength and reduce the viscosity of the system Effect

Active Publication Date: 2012-07-18
仙桃市茂盛塑料制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method has improved the mechanical properties of PVA nanofibers, but as a deeper application, the fracture strength still needs to be improved

Method used

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  • Polyvinyl alcohol nanofiber, and preparation method and device thereof
  • Polyvinyl alcohol nanofiber, and preparation method and device thereof
  • Polyvinyl alcohol nanofiber, and preparation method and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this example, the technical scheme of freezing and thawing was adopted to prepare a moderately cross-linked PVA electrospinning solution inside, and the specific steps were as follows:

[0021] 1. Dissolve N,N-bis(2-hydroxyethyl)aminoacetic acid in concentrated hydrochloric acid, raise the temperature to 150°C under reduced pressure, keep the temperature for 4 hours, precipitate, filter with suction, and dry to obtain water-soluble Hydroxyl-terminated hyperbranched polyester;

[0022] 2. Mix PVA particles with a relative molecular weight of 72000 and 1wt% water-soluble hydroxyl-terminated hyperbranched polyester in distilled water, slowly heat to 90°C at a rate of 0.5°C / min from room temperature, and magnetically stir for 4 hours to make it Dissolve fully, obtain the PVA mixed solution that concentration is 6wt%;

[0023] 3. Cool the PVA mixed solution obtained in step 2 to room temperature, and freeze it at -30°C;

[0024] 4. After freezing for 10 hours, take it o...

Embodiment 2

[0030] 1, prepare hydroxyl-terminated hyperbranched polyester according to the technical scheme of embodiment 1;

[0031] 2. Mix PVA particles with a relative molecular mass of 72,000 and 3wt% hydroxyl-terminated hyperbranched polyester in distilled water, slowly heat to 90°C at a rate of 0.5°C / min from room temperature, and magnetically stir for 4 hours to fully dissolve it. The homogeneous PVA solution that obtains concentration is 8wt%;

[0032] 3. Cool the PVA solution obtained in step 2 to room temperature, and freeze it at -50°C;

[0033] 4. After freezing for 10 hours, take it out and place it at room temperature for thawing;

[0034] 5. Repeat steps 3 and 4;

[0035] 6. After 5 times of freezing and thawing, some microcrystals formed in the solution, and an internal micro-crosslinked PVA gel was obtained, which was then placed in a 55°C water bath and heated for half an hour to obtain a spinning solution;

[0036] 7. Put the PVA spinning solution obtained in step 6 ...

Embodiment 3

[0038] 1, prepare water-soluble hydroxyl-terminated hyperbranched polyester with embodiment 1;

[0039] 2. Mix PVA particles with a relative molecular weight of 100,000 and 3wt% hydroxyl-terminated hyperbranched polyester in distilled water, heat slowly from room temperature to 90°C at a rate of 0.5°C / min, and magnetically stir for 4 hours to fully dissolve it. The homogeneous PVA solution that obtains concentration is 6wt%;

[0040] 3. Cool the PVA solution obtained in step 2 to room temperature, and freeze it at -30°C;

[0041] 4. After freezing for 10 hours, take it out and place it at room temperature for thawing;

[0042] 5. Repeat steps 3 and 4;

[0043] 6. After 7 times of freezing and thawing, some microcrystals formed in the solution to obtain an internally cross-linked PVA gel, which was then placed in a water bath at 50°C and heated for half an hour to obtain a PVA spinning solution with a viscosity of 438 mpa. s;

[0044] 7. Put the PVA spinning solution obtained...

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Abstract

The invention discloses polyvinyl alcohol (PVA) fiber, and a preparation method and a preparation device thereof. The method comprises the following steps: dissolving polyvinyl alcohol into distilled water; adding 1 to 5 weight percent of water soluble hydroxyl terminated hyperbranched polyester; placing the obtained mixed liquor at the temperature of between -20 and -70 DEG C and freezing for 8 to 24 hours; defreezing and heating at room temperature to prepare spinning liquor with the viscosity of 180 to 550 mpa.s; and obtaining high strength polyvinyl alcohol nano-fiber nonwoven fabric with the strength of 1,045 to 1,800 N / m<2> on a receiving screen by an electrostatic spinning process. The PVA liquor is frozen and defrozen, so the intermolecular chain entanglement is improved, more intermolecular hydrogen bonds are formed, and the tensile strength of the obtained nano-fiber can be obviously improved. The invention has a simple process, is pollution free in the production process and contributes to quick development and popularization application of the PVA nano-fiber.

Description

technical field [0001] The invention relates to a fiber forming technology, in particular to a polyvinyl alcohol nanofiber, a preparation method and a preparation device thereof. Background technique [0002] Polyvinyl alcohol (PVA) nanofibers have the characteristics of large specific surface area, small pore size, and soft texture, and are good biomedical materials. At present, the preparation of PVA nanofibers at home and abroad is almost all spun by electrospinning technology. For example, in the Chinese invention patent "Renewable Recyclable PVA Nanofiber Fabric and Its Preparation Method" with the publication number CN1664187, a method for preparing PVA nanofiber fabric is disclosed. ℃ water, stir to dissolve it, and obtain a colorless and transparent PVA aqueous solution with a concentration of 6-12%; the solution is spun by electrospinning, with a voltage of 6-20 kV, and the distance from the spinneret to the receiving screen is 10-20cm, the temperature is 20-30°C,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/50D01F1/10D04H1/4309D01D5/00
Inventor 戴礼兴黄梅孙君
Owner 仙桃市茂盛塑料制品有限公司
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