Renewable antibacterial waterborne polyurethane synthetic leather with high peel strength and preparation method thereof

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: