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Antimicrobial Plastics and antimicrobial agents

Antibacterial plastic is a new kind of functional material which has been developed rapidly in recent years. All kinds of products made from them have the function of self cleaning, which is of great significance to protect human health and reduce disease.

When the plastic is added and mixed with the antibacterial agent, the plastic products can be made to have antibacterial property, and bacteria can be killed or inhibited in a certain time.

Inorganic silver carrying antibacterial agent

Inorganic antibacterial agents are mostly metal ion antibacterial agents, which are composed of inorganic carrier and antibacterial components. The antibacterial ability of silver and copper, zinc and other metal itself has, through physical adsorption or ion exchange method, silver, copper and zinc (or ions) immobilized on the surface of zeolite, silica porous materials made of antibacterial agent, and then added to the products can be obtained with the antibacterial the material.

Many metal ions have bactericidal and algae killing effect. The metal ions, the inhibition of the pathogen killing activity in the following order: Ag>Hg>Cu>Cd>Cr>Ni>Pb>Co>Zn>Fe, Hg, because of decreasing Cd, Pb, Cr's toxicity, actually used as a metal antiseptic metal such as Ag, Cu and Zn. The Ag sterilization ability is much bigger than Cu and Zn. The bactericidal ability of silver was also related to the valence state of silver.

Organic antibacterial agent

The main varieties of organic antibacterial agent with ethyl vanillin or vanilla aldehyde compounds, commonly used in polyethylene film for food packaging, has antibacterial effect. In addition to acyl aniline, imidazole, thiazole and isothiazole ketone derivative, quaternary ammonium salts, double, phenols and other quack.

In general, organic antibacterial agent of poor heat resistance, easy hydrolysis, short duration. At present, the safety of organic antibacterial agents is still under study.

Selection of antimicrobial agents for plastics

The minimum inhibitory concentration and minimum bactericidal concentration: the antibacterial effect is mainly MIC that prevent bacteria antibacterial agent through the minimum concentration of minimum inhibitory concentration values "; the minimum bactericidal concentration (MBC) value, resulting in bacterial death antibacterial agent concentration and sterilization rate reflected the lowest. The lower the MIC and MBC value, the better the antibacterial and bactericidal effect.

Antimicrobial spectrum: a collection of antimicrobial agents that exhibit antimicrobial activity against a variety of antimicrobial agents. The antibacterial agent which can show the antibacterial activity to many kinds of microorganisms at the same time is called broad-spectrum antibacterial agent. Selection of antimicrobial agents should be as far as possible to choose broad-spectrum antibacterial agent.

Processing adaptability: the general antibacterial agents need to be combined with materials can be prepared into the corresponding products, so the selection of antimicrobial agents to be able to adapt to the processing requirements of the substrate.

Reactive inertia: the use of antimicrobial agents in the course of the use of materials and do not have the physical and chemical effects of the substrate, in particular, do not affect the antimicrobial properties of polymer materials and products. The use of special reactive antibacterial agents must be fully considered in this regard.

Preparation method of antibacterial plastics

In the preparation of antibacterial plastics, inorganic antibacterial agent is a kind of functional additive, which is mixed with resin in the form of filler. The general method is the antibacterial agent made of antibacterial masterbatch, and then to a certain proportion and resin blend extrusion granulation

Application of Antimicrobial Plastics

(1) health kitchen appliances: plastic tableware, plastic board, plastic barrels, toothbrush, food tray, plastic boxes etc..

(2) packaging materials: plastic bags with film, all kinds of plastic film, hollow containers, such as plastic beverage bottles, cosmetics bottles, filters, etc..

(3) household appliances and daily necessities: refrigerator, calculator, purifier, water dispenser, humidifier, fan, computer keyboard etc..

(4) building materials room: pipeline, door handles, washing basin, toilet, bathtub, power switch, shower curtains and waterproof containers, cultivation of air conditioning filter.

(5): medical kit, packing paper, stethoscope, thermometer, body weight, hearing aids, hospital facilities, medical staff and patient clothing, syringes, infusion, disposable gloves.

(6) other: plastic toys, piano keys, subway and other public facilities such as bus ring handle.

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