In the production of kitchen equipment, medical equipment, toilet things and cleaning decoration, people have been looking forward to the emergence of new metal materials that can fight bacteria and can form already.
Both structure and functional properties of new materials – antibacterial stainless steel has both mechanical properties of structural materials, and physical and chemical properties of functional materials, it like general stainless steel decoration and beautification as a component, and antibacterial, sterilization of the self-cleaning effect.
Data makes clear, now, the antibacterial agent that uses extensively basically is organic antibacterial agent and inorganic antibacterial agent two kinds. Organic antibacterial agents have a long history and have been widely used in the medical field, mainly by spraying or soaking. But they are insufficient in safety, durability, broad-spectrum antibacterial, heat resistance, especially serious damage to the human body and the environment, can not be used in many occasions. Inorganic antibacterial agent basically is to serve as additive, make the cloth that has antibacterial effect, plastic products, active carbon, sanitary ceramics and so on, use range increasingly extensive. But in heat resistance, wear resistance, corrosion resistance, strength and molding, can not meet many daily use requirements. Accordingly, when making appliance of kitchen machinery, medical treatment, toilet articles for use and cleaning decorate, must use to have antibacterial effect and shape the metallic products of each different, beautiful appearance. This kind of newly born stainless steel with antibacterial effect is undoubtedly the ideal product in people’s mind.
Antibacterial stainless steel is divided into two types: coating type and its own antibacterial type. The former can transform the existing stainless steel products, that is, on the stainless steel plated with bactericidal metal materials, or other inorganic materials with bactericidal effect, but the disadvantage is easy to wear, easy to aging, with the temperature difference and the change of the external environment, so that the stainless steel lose antibacterial; The latter is in the stainless steel production process to add some metal elements with antibacterial effect, and then through special treatment to make stainless steel itself antibacterial, it does not have the disadvantages of the former, and low cost, easy to process.
The killing rate of Escherichia coli was 99.9%, Staphylococcus aureus was 99.5%, Candida albicans was 99.0%, and blight fungus was 86.6%. Common sense tells us that these 4 kinds of bacteria are the most common in daily life, to achieve such a killing effect, proving that the antibacterial stainless steel antibacterial broad-spectrum.
With the adjustment and optimization of material composition and microstructure, the antibacterial effect will be further improved. In the bacteriostatic/antibacterial test in aqueous solution, the antibacterial stainless steel sample was soaked in the prepared bacteria solution, and the number of bacteria in the bacteria solution was observed after soaking for different time. The results showed that the killing rate of EScherichia coli and Staphylococcus aureus reached 90%-95%, indicating that the material can also kill bacteria in aqueous solution. That is, it can kill not only directly contacted bacteria, but also indirectly contacted bacteria through the diffusion of the solution.
At present, there is no clear definition of “bactericidal” and “antibacterial” in the material field. Generally antibacterial understanding is to inhibit the development, growth and reproduction of bacteria, sterilization is to kill microorganisms. Antibacterial stainless steel can make the attached bacteria do not reproduce, be killed or the number of bacteria in a low level of state, and does not change the strength of ordinary stainless steel, corrosion resistance, beautiful characteristics, has a very broad application prospects. Look forward to going into the home soon.
