Water-based antibacterial and antiviral anionic polyurethane resin and preparation method thereof

Abstract

The invention discloses water-based antibacterial and antiviral anionic polyurethane resin and a preparation method thereof. The polyurethane resin is prepared from the following raw materials in parts by mass: 30-35 parts of macromolecular polyol, 5-10 parts of polyisocyanate, 2-6 parts of a hydrophilic chain extender, 1-2 parts of zinc hydroxide, 0.5-2 parts of a micromolecular alcohol chain extender, 1-2 parts of an amine chain extender, 0.01-0.5 parts of a catalyst, 5-12 parts of an organic solvent and 45-55 parts of deionized water, wherein the hydrophilic chain extender is caffeic acid. The caffeic acid is used as a hydrophilic chain extender, is easily dissolved in the organic solvent, can fully react with polyisocyanate, improves the polymerization reaction stability, has wide antibacterial and antiviral activity, can absorb ultraviolet rays, and can improve the coloring power of the waterborne polyurethane resin. Zn ions have long-acting antibacterial activity. The caffeic acid and zinc hydroxide are subjected to a neutralization reaction to obtain zinc caffeate solution modified waterborne polyurethane with Zn ions, so that the waterborne polyurethane can obtain excellent antibacterial and antiviral capacities without adding an antibacterial additive and shows better storage stability.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a water-based antibacterial and antiviral anionic polyurethane resin and a preparation method thereof. Background technique [0002] Polyurethane is widely used in leather finishing, coatings, adhesives and other fields due to its advantages such as wide range of softness and hardness, low temperature resistance, good flexibility and strong adhesion. However, with the promulgation of environmental safety laws and regulations in various countries, many countries have restricted the application of solvent-based polyurethane. [0003] Since the continuous phase of water-based polyurethane is water, it is safe and easy to store and store, and it is convenient to use and low in cost. It is superior to solvent-based polyurethane in some properties, so the research and production of water-based polyurethane has been paid attention to by countries all over the world, and has...

AI Technical Summary

Problems solved by technology

[0004] Anionic waterborne polyurethane includes sulfonic acid type and carboxylic acid type. The preparation method of carboxylic acid type waterborne polyurethane mainly relies on hydrophilic chain extenders such as dimethylol propionic acid (DMPA) and dimethylol butyric acid (DMBA) to Preparation, but these two kinds of hydrophilic chain extenders produce heavy pollution in the production process. DMPA is currently the most widely used, but because it is difficult to dissolve in acetone, it is difficult to react in the synthesis process of water-based polyurethane; DMBA It has high solubility in acetone and low viscosity during the synthesis process, but the production pollution is serious, the synthesis technology is complicated and difficult, and there are few large-scale manufacturers in China at present.

[0005] At present, many anionic water-based polyurethanes do not have a bactericidal effect, so this problem needs to be solved urgently

Images