1. What is the antibacterial principle of antibacterial masterbatch?
Antibacterial masterbatch is a product in which various antibacterial agents are evenly dispersed in a matrix resin to form a concentrate. Into plastic or fiber, it can have an antibacterial effect. The antibacterial performance of antibacterial masterbatch mainly comes from the antibacterial agent in it. Different antibacterial masterbatch uses different antibacterial agents. Taking the common inorganic nano zinc oxide antibacterial agent as an example, its antibacterial principle is mainly:
1. Electrostatic adsorption
Due to the combination of zinc and oxygen, the electronegativity of the surface of zinc oxide is larger than that of ordinary metal ions, and its electronegativity mainly comes from the nanoscale And structure, due to its nanoscale, more zinc atoms are exposed on the surface, making more of its surface positively charged; if the nano zinc oxide crystal form is incomplete and there are many surface defects, the positive charge will also be increased. The cell wall (peptidoglycan, teichoic acid, lipopolysaccharide) and cell membrane (phospholipids) on the cell surface are negatively charged. According to the principle of opposite charge attraction, bacteria will be adsorbed indiscriminately.
2. Ion dissolution destroys the bacterial cell wall
Zinc ions are released from the zinc oxide surface and interact with the cells, replacing the Ca and Mg plasma that originally regulated their physiological activities. The protein denatures and coagulates, and the enzyme loses activity, thereby inactivating the original functions of the cell wall and cell membrane.
3. Photocatalytic sterilization
Nano zinc oxide catalyzes bacterial surface water to produce H2O2, the strong oxidizing property of H2O2 and its oxidative products can directly oxidize the outer structure of bacteria, causing the cell permeability barrier to be destroyed and the bacteria The balance of substances inside and outside the body is disrupted, causing bacterial death.
2. What is the antibacterial rate of antibacterial masterbatch?
Antibacterial masterbatch has antibacterial properties, and the antibacterial rate of qualified products is required to be above 99%.
The antibacterial masterbatch produced by regular manufacturers generally has broad-spectrum antibacterial properties, is effective against bacteria and mold, can achieve long-lasting sterilization, and has an antibacterial activity value ≥ 2.0.
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