US 12,270,149 B1
Renewable antibacterial waterborne polyurethane synthetic leather with high peel strength and preparation method thereof
Neng Qian, Shaoxing (CN); Guochun Qian, Shaoxing (CN); Aixue Dong, Shaoxing (CN); Weiming Wang, Shaoxing (CN); Gaofeng Xie, Shaoxing (CN); and Haifeng Zhu, Shaoxing (CN)
Assigned to ZHEJIANG MEISHENG NEW MATERIAL CO., LTD, Shaoxing (CN)
Filed by ZHEJIANG MEISHENG NEW MATERIAL CO., LTD, Shaoxing (CN)
Filed on Oct. 23, 2024, as Appl. No. 18/923,749.
Application 18/923,749 is a continuation of application No. PCT/CN2024/104913, filed on Jul. 11, 2024.
Claims priority of application No. 202410103083.0 (CN), filed on Jan. 25, 2024.
Int. Cl. D06N 3/14 (2006.01); D06M 11/38 (2006.01); D06M 13/148 (2006.01); D06M 13/463 (2006.01); D06N 3/00 (2006.01); D06M 101/32 (2006.01)
CPC D06N 3/14 (2013.01) [D06M 11/38 (2013.01); D06M 13/148 (2013.01); D06M 13/463 (2013.01); D06N 3/0006 (2013.01); D06N 3/0009 (2013.01); D06N 3/0011 (2013.01); D06N 3/0036 (2013.01); D06N 3/0059 (2013.01); D06N 3/0097 (2013.01); D06M 2101/32 (2013.01); D06N 2209/1664 (2013.01); D06N 2209/1671 (2013.01); D06N 2211/28 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A preparation method of a renewable antibacterial waterborne polyurethane synthetic leather with a high peel strength, comprising the following steps:
performing a first impregnation on a base fabric in a surface modification liquid to form a surface modification layer on a surface of the base fabric to obtain a pretreated base fabric; wherein the surface modification liquid comprises the following components: 10-15 mL/L of benzyl alcohol, 0.3-0.5 g/L of an accelerator, and 15-20 g/L of sodium hydroxide; a liquor ratio of the first impregnation is 1:(5-10); the first impregnation is performed at a temperature of 100-120° C. for 20-30 min;
coating a renewable and durable antibacterial waterborne polyurethane emulsion on a release paper, and drying to obtain a polyurethane surface layer; adhering the pretreated base fabric to the polyurethane surface layer, drying, and then stripping the release paper to obtain a base fabric containing a polyurethane layer;
chloridizing the base fabric containing the polyurethane layer to obtain the renewable antibacterial waterborne polyurethane synthetic leather with the high peel strength;
wherein a preparation method of the renewable and durable antibacterial waterborne polyurethane emulsion comprises the following steps:
(1) mixing polymer diol and diisocyanate for a first reaction to obtain a first mixture;
(2) mixing the first mixture, dibutyltin dilaurate, and N,N-dimethylformamide for a second reaction to obtain a second mixture;
(3) mixing the second mixture, a chain extender, an epoxy resin, and N,N-dimethylformamide for a third reaction to obtain a third mixture;
(4) mixing the third mixture, a halamine antibacterial monomer, an ultraviolet absorbent, and N,N-dimethylformamide for a fourth reaction to obtain a fourth mixture;
(5) mixing the fourth mixture, an antioxidant, triethylamine, and N,N-dimethylformamide for a neutralization reaction to obtain a fifth mixture;
(6) adjusting a viscosity of the fifth mixture by using N,N-dimethylformamide, and mixing the fifth mixture with water and diethylenetriamine for an emulsification to obtain the renewable and durable antibacterial waterborne polyurethane emulsion;
a mass-to-volume ratio of the polymer diol in the step (1) to the chain extender, the epoxy resin and the N,N-dimethylformamide in the step (3) is (30-40) g:(3-5) g:(5-8) g:(15-20) mL;
the ultraviolet absorbent in the step (4) is 2,4-dihydroxybenzophenone;
a mass-to-volume ratio of the polymer diol in the step (1) to the halamine antibacterial monomer, the ultraviolet absorbent, and the N,N-dimethylformamide in the step (4) is (30-40) g:(1-3) g:(2-5) g:(15-25) mL; and
the halamine antibacterial monomer in the step (4) is 3-(2,3-dihydroxypropyl)-5,5-dimethylhydantoin and has a structural formula as follows:

OG Complex Work Unit Chemistry