A kind of preparation method of pva fiber

一种纤维、纺丝原液的技术，应用在PVA纤维的制备领域，能够解决增加创面异物遗留风险等问题，达到杂质少、减少杂质、纯度高的效果

Active Publication Date: 2021-10-01
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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  • A kind of preparation method of pva fiber
  • A kind of preparation method of pva fiber
  • A kind of preparation method of pva fiber

Examples

Experimental program
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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 fiber, which comprises the following contents: step 1, preparing spinning stock solution; raw material adopts PVAc, adding methanol to dissolve and then filtering to obtain spinning stock solution; step 2, spinning; injecting spinning stock solution into Spinneret, the sprayed fibers enter the DC electrolytic cell for coagulation bath, and undergo a series of reactions of alcoholysis, electrolytic catalytic alcoholysis and alcohol leverage; the solution formula in the electrolytic coagulation bath includes: alkali, alcohol, water; step 3: acid bath; put the fiber that has passed through the coagulation bath into an acid solution with a pH value of 4.5-7.0 for an acid bath; step 4: After stretching, drying, washing, hot water crimping and packaging, the finished product of polyvinyl alcohol fiber is formed by using PVAc replaces PVA, combined with the use of electrolytic coagulation bath, so that the coagulation bath does not need to use Glauber's salt, PVAc is alcoholyzed in the electrolytic cell to obtain PVA, and the produced PVA fiber has high purity and less impurities.

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, the thermal decomposition temperature is 200-220°C, and the melting point is 225-230°C. [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 G...

Claims

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Application Information

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Patent Type & Authority Patents(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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