Application of antibacterial and mildew resistant silicone rubber

Because the silicone rubber has high temperature resistant, good low temperature resistance, weatherability, food grade, physiological inertia, high permeability, electrical insulation, flame retardant very excellent performance, such as silicone rubber products are widely used in the infant child products, food, medical, daily necessities, industrial, electronic appliances and other fields, can say you every day in contact with the silicon rubber products. However, due to the special structure of silicone rubber, the surface is easy to adhere to bacteria and mold, which may bring human diseases. As a new functional material, antibacterial silicone rubber can effectively inhibit the surrounding environment of bacteria, mold and other harmful microorganisms attached to the surface, and has been rapidly developed and applied in recent years.

Bacteria can be divided into gram-positive bacteria and gram-negative bacteria. Gram-positive bacteria include staphylococcus, streptococcus, pneumonia diplococcus, anthrax bacillus, diphtheria bacillus, tetanus bacillus, they can produce external toxins to make people sick; Bacteria of negative of change orchid family name includes dysenteric bacili, typhoid bacili, coliform, be out of shape bacili, green pus bacili, whooping cough bacili, cholerae vibrio and meningitis diplococcus to wait, they can produce endotoxin to make the person causes disease.

The main testing standards of antibacterial silicone rubber are Chinese national standard GB/T 31402-2015 Plastic surface antibacterial performance test method, Japanese standard JIS Z 2801-2010 antibacterial processing products antibacterial test method antibacterial effect, And the international standard "ISO 22196-2011 Measurement of antibacterial activity of plastics and other non-porous Surfaces", etc. The three standards are basically equivalent: select a gram-positive bacteria (Staphylococcus aureus) and a gram-negative bacteria (Escherichia coli) for testing. The colonies of the antifungal (non-antibacterial) and antibacterial samples were observed 24 hours after inoculated with the same strain and liquid amount of bacteria. The antibacterial activity value and antibacterial rate were calculated. Generally speaking, the antibacterial activity value ≥2, that is, the antibacterial rate ≥99%, is considered to have a strong antibacterial effect.