③In the product molding process, the antibacterial agent is embedded in the plastic surface.

The direct addition method of antibacterial agent is simple, but the antibacterial agent is poorly dispersed in the plastic, the antibacterial agent particles are easy to agglomerate, the antibacterial effect is poor, the antibacterial agent is not fully utilized, and the cost of use increases. The core technology of antibacterial masterbatch method is the development of antibacterial masterbatch. The antibacterial masterbatch is a highly concentrated body in which the antibacterial agent is dispersed in the carrier resin, and contains an antibacterial dose of 10% to 40%. Processing antibacterial masterbatch with plastic, or blending and dispersing again with plastic is conducive to the dispersion of antibacterial agent and the exertion of antibacterial effect. It is a technical approach that has been generally accepted and widely used. Reasonable antibacterial masterbatch design and use , Can greatly save the cost of antibacterial agents. The main purpose of processing antibacterial plastic products in the product forming stage is to save the amount of antibacterial agents, use antibacterial agents reasonably, and control costs. At present, there are two specific implementations: one is to make ultra-fine antimicrobial particles into a spray solution and spray them on the surface of plastic molds, and the antimicrobial agents enter the surface of plastic parts during plastic injection molding; the other The antibacterial agent and plastic are made into a film, and then the film is attached to the surface of the mold, and the antibacterial plastic film is bonded to the surface of the part when the plastic is formed. Using this antibacterial molding technology can greatly save the amount of antibacterial agent. Using antibacterial molding technology too can greatly save the amount of antibacterial agent, but the current application is not common, the main reason is that the equipment investment is relatively large.

2. Inorganic antibacterial plastic is to add inorganic antibacterial agent to the resin, rely on the migration of inorganic antibacterial agent in the resin, form a surface layer with antibacterial ability on the surface of the resin, and sterilize by contact with the packaged object. Since most of the inorganic antibacterial agents are in powder form and have a small particle size, it is generally necessary to uniformly disperse these particles into the resin during processing to obtain the desired antibacterial effect. Therefore, the antibacterial agent is generally made into an antibacterial masterbatch, and then blended with the resin in the desired ratio. In addition, the compatibility of the antibacterial agent and the resin needs to be considered. Dispersant, etc.
Experiments show that the film was tested for basic properties by blending the nano silver powder antibacterial agent and ldpe resin. The results show that after adding the nano silver antibacterial agent, the film has good antibacterial properties, but the film is Tensile strength, elongation at break and oxygen permeability decreased slightly. However, it fully complies with production standards and performance requirements of packaging films.

3. At present, the preparation of antibacterial materials mainly uses the method of adding inorganic nano antibacterial materials, that is, adding nano antibacterial materials to plastic raw materials. The antibacterial principle of the brand new contact inorganic nano antibacterial material is different from the traditional dissolution type organic nano antibacterial material and photocatalyst inorganic nano antibacterial material. The sterilization mechanism is that when the positively charged antibacterial components come into contact with the negatively charged microbial cells, they adsorb each other, that is, they effectively penetrate the cell membrane, denature the cell protein, and cannot breathe, metabolize, and multiply until death, and complete sterilization. . At this time, the antibacterial ingredients are not consumed, and the original antibacterial ability is still maintained, so its antibacterial ability can be effective for a long time.

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