Method for preparing stainless steel surface nano antibacterial film

Abstract

The invention discloses a method for preparing a stainless steel surface nano antibacterial film, comprising the steps of: (1) pretreating a stainless steel workpiece to be coated; (2) spraying TiO2 colloidal sol composite slurry on the surface of the stainless steel workpiece, drying and carrying out low-temperature sintering treatment to form an antibacterial inorganic film; wherein the TiO2 colloidal sol composite slurry is prepared by mixing TiO2 colloidal sol precursor and TiO2 nano-powder; the volume ratio between the TiO2 nano-powder and the TiO2 colloidal sol precursor is 50-90%; the TiO2 colloidal sol precursor is prepared by the components with the content: 140-180g / L of titanium alkoxide, 10-25g / L of acid catalyst, 5-30g / L of complexing agent, 600-700g / L of alcohols solvent, 10-20g / L of copper or silver heavy metallic salt and 12-20g / L of water; and (3) spraying the TiO2 colloidal sol precursor in the step (2) on the antibacterial inorganic film, then carrying out low-temperature sintering densifying treatment, and obtaining the nano antibacterial film layer. The method has stable technique, and the prepared antibacterial film has good and permanent antibacterial property and firm film layer.

Description

technical field [0001] The invention relates to a preparation method of a nanometer antibacterial film on the surface of stainless steel. Background technique [0002] Stainless steel materials have been widely used in the food industry, catering service industry, industry and family life. With the continuous occurrence of public health events such as SARS and bird flu, people have more and more requirements for the cleanliness and hygiene of the living environment and daily utensils. higher. People hope that stainless steel utensils will not only have the characteristics of being stainless and clean as new, but also have functions such as mildew resistance, antibacterial, and corrosion resistance. Therefore, as a new type of material developed at the intersection of material science and environmental science, antibacterial stainless steel came into being. [0003] At present, antibacterial stainless steels such as alloy type and coating type have appeared on the market. ...

AI Technical Summary

Problems solved by technology

Copper-added antibacterial stainless steel is not only costly due to the large amount of copper added, but also not resistant to corrosion in some media, especially pitting corrosion is more serious

The cost of silver-added antibacterial stainless steel is high due to the addition of silver ions. At the same time, the addition of copper and silver ions leads to changes in the processing properties of the material, which adversely affects the existing stainless steel processing technology

Although antibacterial oxide film stainless steel has good corrosion resistance, the processing technology of coated antibacterial stainless steel is not much different from the traditional coating process, except that the filler becomes heavy metal ions or other semiconductor materials with bactericidal properties, which has traditional All the weak points of the coating material, poor adhesion, low surface hardness, poor wear resistance