Preparation method of PVA fibers

A fiber and spinning dope technology, applied in the field of PVA fiber preparation, can solve the problems of increasing the risk of foreign matter left on the wound surface, and achieve the effect of less impurities and high purity

Active Publication Date: 2020-12-11
ZHENDE MEDICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For dressings for wound care, the risk of foreign bodies on the wound is increased due to the presence of water in the exudate

Method used

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  • Preparation method of PVA fibers
  • Preparation method of PVA fibers
  • Preparation method of PVA fibers

Examples

Experimental program
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Effect test

preparation example Construction

[0039] Such as figure 2 Shown, a kind of preparation method of PVA fiber comprises the following contents:

[0040] Step 1, preparing spinning dope;

[0041] The raw material adopts PVAc, and after adding methanol to dissolve, it is filtered to obtain the spinning stock solution; as an example, the concentration ratio range of PVAc and methanol in the spinning stock solution is 15-80 to 20-85; as a kind of preference, the spinning stock solution The mass fraction of PVAc is 40-45%, and the mass fraction of methanol is 55-60%.

[0042] Step 2, spinning;

[0043] Under the conditions of 0.05-0.6MPa and temperature of 45-55°C, the spinning stock solution is injected into the spinneret, and the ejected fibers enter the DC electrolytic cell, such as image 3 As shown, the coagulation bath is carried out, the DC voltage of the DC electrolytic cell is 1.23V-200V, and a series of reactions of alcoholysis, electrolytic catalytic alcoholysis and alcohol leverage are carried out; the...

Embodiment 1

[0049] first step,

[0050] Weigh 180 kg of polyvinyl acetate particles and 270 kg of methanol solution respectively, and add polyvinyl acetate first, followed by methanol, and add them to the reaction kettle. The temperature rises to 50 ° C to fully dissolve polyvinyl acetate to in methanol solution. The concentration ratio range of PVAc to methanol in the spinning dope is 2:3.

[0051] The obtained PVAc / MT solution is filtered through stage I, degassed, and filtered through stage II, and the PVAc / MT solution is introduced into the spinning pressure regulating tank.

[0052] In the second step, the electrolyte

[0053] Add 700 kilograms of water in the insulator electrolytic cell, drop into 270 kilograms of potassium hydroxide solids and 30 kilograms of 99% isopropanol in water.

[0054] ②Electrolytic cell

[0055] Combined with the process flow chart, an anode and a cathode electrode are formed in the electrolytic cell through the wire, and the electrode material is grap...

Embodiment 2

[0064] first step,

[0065] Weigh 200 kg of polyvinyl acetate particles and 250 kg of methanol solution respectively, and add polyvinyl acetate first, followed by methanol, and add them to the reaction kettle. The temperature rises to 55 ° C to fully dissolve polyvinyl acetate to in methanol solution. The concentration ratio of PVAc to methanol in the spinning dope ranges from 4 to 5.

[0066] The obtained PVAc / MT solution is filtered through stage I, degassed, and filtered through stage II, and the PVAc / MT solution is introduced into the spinning pressure regulating tank.

[0067] second step,

[0068] ①Electrolyte

[0069] Add 700 kilograms of water in the insulator electrolytic cell, drop into the alcohol of 280 kilograms of potassium hydroxide and 20 kilograms of 99% in water.

[0070] ②Electrolytic cell

[0071] Combined with the process flow chart, an anode and a cathode electrode are formed in the electrolytic cell through the wire, and the electrode material is gr...

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Abstract

The invention discloses a preparation method of PVA fibers. The preparation method comprises the following steps: 1, preparing a spinning solution; adopting PVAc as a raw material, adding methanol fordissolution, and obtaining a spinning solution through filtration; 2, spinning; injecting the spinning solution into a spinneret plate, enabling sprayed fibers to enter a direct-current electrolytictank to be subjected to coagulating bath, and performing a series of reactions of alcoholysis, electrolytic catalytic alcoholysis and alcohol lever, wherein a solution formula in the electrolytic coagulating bath comprises alkali, alcohol and water; 3, acid bath: putting the fibers subjected to the coagulating bath into an acid solution with the pH value of 4.5-7.0 for acid bath; and 4, after stretching, drying, washing, hot water curling and packaging, forming a polyvinyl alcohol fiber finished product, replacing PVA with PVAc, wherein an electrolytic coagulating bath is used in cooperation,mirabilite does not need to be used in the coagulating bath, PVA is obtained through alcoholysis of PVAc in an electrolytic tank, and the produced PVA fiber is high in purity and few in impurity.

Description

technical field [0001] The invention relates to the production field of polyvinyl alcohol fibers, in particular to a preparation method of PVA fibers. Background technique [0002] Polyvinyl alcohol (PVA) is a kind of water-soluble polymer, which is obtained by alcoholysis of polyvinyl acetate. Each repeating unit contains a hydroxyl group. It contains a large number of hydrogen bonds in and between molecules, so PVA molecules have a high degree of crystallinity. performance, chemical stability, thermal stability, etc. The average molecular weight of polyvinyl alcohol fibers is 60,000-250,000, and the thermal decomposition temperature is 200-220 The melting point is 225-230 [0003] Existing programs such as figure 1 Shown, raw material adopts PVA, coagulation bath adopts Glauber's salt; But such technique has following defect: [0004] 1. The purity of the obtained PVA fiber is not high and there are many impurities; [0005] 2. The coagulation bath needs to use Gla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/16D01F11/06D01F6/14C08F8/00C08F118/08
CPCD01F6/16D01F11/06D01F6/14C08F8/00C08F118/08D01D1/02D01D5/06D01D10/00C08F116/06
Inventor 鲁建国
Owner ZHENDE MEDICAL CO LTD
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