US 12,441,882 B2
Bacterial cellulose-polyurethane composite material, preparation method therefor, and application thereof
Yuguang Zhong, Haikou (CN); and Chunyan Zhong, Haikou (CN)
Assigned to Chunyan Zhong, Haikou (CN); Yuguang Zhong, Haikou (CN); Hainan Guangyu Biotechnology Co., Ltd, Haikou (CN); and Hainan Yeguo Foods Co., Ltd, Haikou (CN)
Filed by Chunyan Zhong, Haikou (CN); Yuguang Zhong, Haikou (CN); Hainan Guangyu Biotechnology Co., Ltd, Haikou (CN); and Hainan Yeguo Foods Co., Ltd, Haikou (CN)
Filed on Jun. 23, 2022, as Appl. No. 17/847,455.
Application 17/847,455 is a continuation of application No. PCT/CN2019/129157, filed on Dec. 27, 2019.
Prior Publication US 2022/0315760 A1, Oct. 6, 2022
Int. Cl. C08L 75/08 (2006.01); A61L 15/22 (2006.01); C08L 1/02 (2006.01)
CPC C08L 75/08 (2013.01) [A61L 15/225 (2013.01); C08L 1/02 (2013.01)] 16 Claims
 
1. A method for producing a bacterial cellulose-polyurethane composite material, comprising:
subjecting bacterial cellulose microfibrils to an organic solvent exchange treatment to obtain a complex A and a complex B having different concentrations of bacterial cellulose microfibrils;
wherein the complex A includes 30-50 wt % of fully dehydrated bacterial cellulose microfibrils and a balance of organic solvent based on 100 wt % of the complex A; the complex B includes 15-30 wt % of partially dehydrated bacterial cellulose microfibrils and a balance of organic solvent based on 100 wt % of the complex B; and wherein the partially dehydrated bacterial cellulose microfibrils contain 5-10 wt % of water;
mixing the complex A and the complex B in a volume ratio of 1:2-5, and adding a polymeric polyol and a diisocyanate compound under the condition of an oil bath for polyaddition reaction, to obtain a bacterial cellulose-polyurethane foam composite prepolymer; and
curing the prepolymer to obtain the bacterial cellulose-polyurethane composite material;
wherein the weight ratio of the polymeric polyol to the diisocyanate compound is 1:0.1-0.2; and the polymeric polyol accounts for 20%-60% of the total weight of the complex A and the complex B.