Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
PREPARATION METHOD FOR PVA FIBER
Document Type and Number:
WIPO Patent Application WO/2021/068186
Kind Code:
A1
Abstract:
Disclosed is a preparation method for a PVA fiber. The preparation method comprises the following steps: step one: preparing a spinning stock solution by dissolving, using PVAc as a raw material, adding methanol and filtering the resulting solution; step two: injecting the spinning stock solution into a spinneret plate for spinning, and introducing the spun fiber into a DC electrolytic tank to perform a coagulation bath, where a series of reactions of alcoholysis, electrolysis catalyzed alcoholysis and alcohol lever occur, the solution formula for the electrolytic coagulation bath comprising an alkali, an alcohol and water; step three: introducing the fiber having been treated in the coagulation bath into an acid solution having a pH of 4.5-7.0 to perform an acid bath; and step four: performing stretching, drying, washing with water, curling in hot water and packing to form a finished PVA fiber product. In the present invention, the use of PVAc as a raw material instead of PVA, coupled with an electrolytic coagulation bath, eliminates the need to use Glauber salt in the coagulation bath. PVAc is alcoholyzed into PVA in the electrolytic tank, and the PVA fiber produced has a high purity with few impurities.

Inventors:
LU JIANGUO (CN)
Application Number:
PCT/CN2019/110559
Publication Date:
April 15, 2021
Filing Date:
October 11, 2019
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
ZHENDE MEDICAL CO LTD (CN)
International Classes:
D01F6/14
Foreign References:
CN1167168A1997-12-10
CN107583097A2018-01-16
JP2002146625A2002-05-22
CN201210416178A2012-10-26
CN200610032535A2006-11-06
Other References:
See also references of EP 3825448A4
Attorney, Agent or Firm:
HANGZHOU YUYANGUNION PATENTAGENCY CO., LTD. (CN)
Download PDF: