Preparation method of organic silicon modified antibacterial waterborne polyurethane

Abstract

The invention discloses a preparation method of organic silicon modified antibacterial waterborne polyurethane. The preparation method comprises the following steps: 1) carrying out vacuum dehydrationon polymer dihydric alcohol for 1 to 3 hours at 85 to 120 DEG C to obtain a product A; 2) cooling a temperature of the product A to 35 to 70 DEG C, then adding diisocyanate and a catalyst I into theproduct A to obtain a mixture, and performing stirring and reaction on the mixture under nitrogen protection to obtain a product B; 3) adding a chain extender I and a chain extender II into the product B, and performing reaction for 1 to 9 hours at 40 to 85 DEG C to obtain a product C; 4) cooling a temperature of the product C to 35 to 40 DEG C, adding a suitable amount of acetone for viscosity reduction, then adding alkoxy silane with secondary amino and performing reaction for 2 to 12 hours to obtain a product D; 5) adding an antibacterial agent containing an alkoxy silicone group into the product D to obtain a mixture, powerfully stirring the mixture at stirring speed of 800rpm or above, adding water into the mixture and removing the acetone to obtain the anti-pollution antibacterial waterborne polyurethane with solid content of 10 to 40 percent. The preparation method of the organic silicon modified antibacterial waterborne polyurethane has the characteristics of good antibacterialperformance, low cost, simple process, environmental protection, high water resistance and mechanical strength, high hardness and difficulty in softening.

Description

technical field [0001] The invention relates to a preparation method of waterborne polyurethane, in particular to a preparation method of organosilicon-modified antibacterial waterborne polyurethane. Background technique [0002] The harm caused by pathogenic microorganisms is a focus of global attention. Especially in recent years, pathogenic microorganisms such as "SARS" and "bird flu" have caused significant adverse effects and damages to the entire society and economy. According to the World Health Organization (WHO) report, in 1995, 17 million people died of bacterial infection in the world, which accounted for 32.7% of the total global death toll in that year. In industrialized countries, 175,000 people die each year from infections among hospitalized patients. In addition to the damage to public health, microbial reproduction also has a very large negative impact on the development of the national economy. For example, according to statistics from a certain domestic ...

AI Technical Summary

Problems solved by technology

However, antibacterial materials or coatings that obtain antibacterial functions by physically doping antibacterial agents also have their disadvantages. For example, the antibacterial efficacy will gradually decay with the release of antibacterial agents, which will pollute the environment and promote bacterial resistance. produce

CN102604002A discloses a water-based antibacterial polyurethane containing quaternary ammonium salts, and CN103420868A also discloses a method for preparing a water-based antibacterial polyurethane emulsion. However, water-based polymers have disadvantages such as poor mechanical strength, low hardness, sensitivity to water, and easy heating and softening

These shortcomings hinder the application of waterborne antibacterial polyurethane to a certain extent.

Images