Title:
METHOD FOR PREPARING POLYURETHANE HYDROGEL
Document Type and Number:
WIPO Patent Application WO/2019/100195
Kind Code:
A1
Abstract:
Provided is a method of preparing a polyurethane hydrogel, the method comprising: according to a mass ratio of 1-7:1, heating dehydrated polyol and polyisocyanate to 70-90°C under a nitrogen atmosphere to react for 2-4 h; cooling the reaction system to 40-50°C, adding 2,2-dimethylolpropionic acid and acetone to react for 0.5-1.5 h; cooling to room temperature, adding triethylamine, reacting for 10-20 min, stirring at a high speed of 800-1000 r/min, adding water dropwise for dispersion, and distilling for 2 h under reduced pressure to remove acetone, thus an aqueous polyurethane emulsion may be obtained; mixing the aqueous polyurethane emulsion with a polyvinyl alcohol solution according to a mass ratio of 1-45:10; freezing at -25°C for 8-12 h, then thawing at room temperature for 4-6 h, and repeatedly freezing and thawing multiple times to obtain a polyurethane hydrogel.
Inventors:
CHEN SHAOJUN (CN)
WANG CAI (CN)
WANG CAI (CN)
Application Number:
PCT/CN2017/112074
Publication Date:
May 31, 2019
Filing Date:
November 21, 2017
Export Citation:
Assignee:
UNIV SHENZHEN (CN)
International Classes:
C08J3/075; C08G18/08; C08L75/04
Foreign References:
| CN107903407A | 2018-04-13 | |||
| JP2004244622A | 2004-09-02 | |||
| CN102492112A | 2012-06-13 |
Other References:
WANG, CAI ET AL.: "An Environmentally Friendly Preparation and Characterization of Waterborne Polyurethane Hydrogels by Polyvinyl Alcohol Physical Cross-linking to Improve Water Absorption", RSC ADVANCES, vol. 5, no. 90, 2 September 2015 (2015-09-02), pages 73882 - 73891, XP055613512
Attorney, Agent or Firm:
HENSEN INTELLECTUAL PROPERTY FIRM (CN)
Download PDF:
Previous Patent: ANTI-DR5 ANTIBODY AND PREPARATION METHOD THEREFOR AND USE THEREOF
Next Patent: POLYURETHANE PREPARATION METHOD
Next Patent: POLYURETHANE PREPARATION METHOD