The hottest silver zinc compound antibacterial age

2022-08-24
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Silver zinc composite antibacterial agents and their applications

Silver and silver zinc composite antibacterial agents have become one of the commonly used antibacterial agents in antibacterial plastics because of their outstanding properties. Nowadays, the market share of antibacterial plastics is expanding, and they are widely used in household appliances, daily necessities, electronic information products, automobiles, food packaging, medicine and health and other fields

antibacterial agents are highly sensitive chemicals to microorganisms such as bacteria and molds and pathogens such as viruses. By developing and screening appropriate varieties of antibacterial agents, we only need to add a small amount of them to other general materials, and after appropriate processing process, we can make antibacterial materials and products that meet specific use requirements

compared with organic and natural antibacterial agents, inorganic antibacterial agents have the advantages of high safety and good long-term effect, especially their excellent heat resistance (the processing temperature can often withstand> ℃ high temperature), making them the first choice antibacterial agents used in plastics, chemical fibers, and even ceramics

Chinese scientists have followed up the research of inorganic antibacterial agents and antibacterial and mildew proof materials since the 1990s, such as Northwest Nonferrous Metals Research Institute, Kunming Precious Metals Research Institute, China Building Materials Research Institute, etc. Among them, the representative is the Institute of chemistry of the Chinese Academy of Sciences and its affiliated National Engineering Research Center for engineering plastics. In the development and application of zeolite based silver and silver zinc composite inorganic antibacterial agents, it has given play to the advantages of interdisciplinary and "industry university research" combination, developed an inorganic antibacterial agent with moderate cost and color resistance, and obtained a Chinese invention patent. This inorganic antibacterial agent is considered to be the first application in Haier and other brand household appliances in the future, which has driven the rapid development of 10 large plastic markets of antibacterial materials and antibacterial products in China, and won the second prize of the national science and Technology Progress Award in 2000. According to statistics, the output of plastic antibacterial agents in China in 1998 was 40 tons, the sales volume was 3 million yuan, and the output value of antibacterial products was 3 billion yuan; In 1999, the output of antibacterial agents was 150 tons, the sales volume was 12million yuan, and the antibacterial products were 10billion yuan. In 2000, the sales volume of antibacterial agents reached 200 tons. In 2005, it will develop to 500 tons of antibacterial agents, and antibacterial products will reach 40billion yuan

performance of silver zinc composite antibacterial agents

the antibacterial performance of antibacterial agents is mainly reflected in two aspects, namely, the antibacterial agent itself and the products used by antibacterial agents (such as antibacterial plastics), with emphasis on the performance of antibacterial products

antibacterial plastics made with antibacterial agents must first maintain the basic properties of plastic materials. The conventional physical and mechanical properties of antibacterial plastics, such as melt flow rate, tensile strength, tensile modulus, elongation at break, notch impact strength, bending strength, bending modulus, hardness, chromaticity, surface finish, etc., are implemented in accordance with the relevant national plastic test standards and product standards. Antibacterial agents and antibacterial plastics should also meet the specified health and safety. The finished antibacterial plastics are non-toxic, odorless and harmless to the environment

in the application of antibacterial agents and antibacterial plastics, antibacterial property is its special function, which requires high efficiency, broad spectrum and long-term effect, and is applicable in relevant environments

the test results of andimei tm-am silver zinc composite antibacterial agent developed by Chongguang nanotechnology Co., Ltd. are described below

antibacterial spectrum

antibacterial spectrum refers to the effective side of antibacterial agents against bacteria, fungi, molds, yeast, algae and other microorganisms. However, there are 80 genera and 60 species of mold in residential space and 120 genera and 120 species of mold in buildings alone. Generally speaking, we cannot test all strains one by one, but choose representative strains for experiments. Escherichia coli, Staphylococcus aureus and Candida albicans are usually selected for the test. In addition, Klebsiella pneumoniae, Salmonella, Pseudomonas aeruginosa, Bacillus subtilis, etc. are often used. Generally, Aspergillus niger, agromyces terrestris, Aureobasidium sprouting, Paecilomyces vannamei, Penicillium cordiformis, Trichoderma viride, Penicillium ochraceum, and Trichoderma sp. were selected for mold control tests. Andime am antibacterial agent has broad-spectrum antibacterial and anti mildew effects

minimum inhibitory concentration of antibacterial agents

the antibacterial ability of an antibacterial agent can be measured by minimum inhibitory concentration (MIC). Dilute the antibacterial agent to different concentrations, act on the strain, quantitatively determine the antibacterial effect of a certain action time, and obtain the mic value. The smaller the minimum inhibitory concentration, the stronger the antibacterial activity of the antibacterial agent. The minimum inhibitory concentration (MIC value) of andime am antibacterial agent against Escherichia coli and Staphylococcus aureus is 150ppm, reaching the same level as the mic value of internationally famous antibacterial agent products (the reported mic value of Japanese products is usually ppm)

antibacterial properties of antibacterial plastics

(1) antibacterial properties

there are many kinds of antibacterial materials, many components in the materials, great differences in properties, and different shapes of finished products, such as antibacterial refrigerator liners made of antibacterial plastics, fruit and vegetable boxes, antibacterial air conditioning filtration, antibacterial shells, as well as sanitary ware and tableware made of antibacterial ceramics, antibacterial carpets and underwear made of antibacterial fibers. Therefore, the determination of the antibacterial testing methods and evaluation standards of antibacterial materials and antibacterial products is of great importance, but for a long time, the lag in the formulation of antibacterial testing methods and standards can not meet the development needs of the market

after years of efforts in the industry, China formulated and promulgated the light industry standard qb/t antibacterial plastics - antibacterial property test methods and antibacterial effects in 2003. This method is a quantitative test method for determining the antibacterial property of antibacterial plastics. It reflects the contact antibacterial principle of antibacterial plastics, and considers external factors such as the actual use conditions of antibacterial plastics in the experimental design, which can objectively reflect the antibacterial ability of antibacterial plastics. Antibacterial plastics with antibacterial rate greater than 90% are qualified products, which are judged to be antibacterial; More than 99% has strong antibacterial property. The antibacterial rate of andime antibacterial plastic can generally be greater than 99%

(2) mold resistance

qb/t "antibacterial plastics - antibacterial performance test methods and antibacterial effect" mold resistance test method, the mold resistance level is divided into 0, 1, 2, 3, 4 levels. The highest mold proof grade is grade 0, which is not long. Mold growth cannot be observed under a microscope with a magnification of 50 times; Level 1 is trace growth, and the area of visible growth is less than 10%; Grade 2, grade 3 and grade 4 are slight growth, medium growth and serious growth respectively. The anti mildew grade of antibacterial plastic is grade 1, which can be reported to have anti mold effect, and grade 0 can be reported to have strong anti mold effect. The mold proof grade of andime am antibacterial agent is grade 1

Application of antibacterial agents

plastics are widely used in daily life and industrial products, such as kitchen appliances, sanitary facilities, household appliances, wallpaper, food packaging, etc. The use of antibacterial plastics can improve the hygiene of products and reduce the pollution of pathogenic bacteria. The application fields of antibacterial agents and antibacterial plastics listed in the table below show great development prospects. Examples of application fields of antibacterial agents and antibacterial plastics

antibacterial agents can be used in plastic products through the following three ways: mixing antibacterial agents directly with plastic and dispersing them in plastic to make antibacterial plastics; Mixing antibacterial masterbatch with plastic; The antibacterial agent is embedded into the plastic surface in the molding process of the product

the direct addition method of antibacterial agent is simple, but the antibacterial agent is poorly dispersed in plastic, the antibacterial agent particles are easy to disperse, the antibacterial effect is poor, the antibacterial agent is not fully utilized, and the use cost increases. The core technology of antibacterial masterbatch method is the development of antibacterial masterbatch. Antibacterial masterbatch is a highly concentrated body of antibacterial agent dispersed in carrier resin, containing 10% - 40% antibacterial dose. The antibacterial masterbatch is processed together with plastic, or re blended and dispersed with plastic, which is conducive to the dispersion of antibacterial agents and the play of antibacterial effect. It is a widely accepted and widely used technical way at present. Reasonable design and use of antibacterial masterbatch can greatly save the cost of antibacterial agents. The main purpose of processing antibacterial plastic products in the molding stage is to save the amount of antibacterial agents, use antibacterial agents reasonably and control costs. At present, there are two specific implementation schemes known. One is to make ultra-fine antibacterial agent particles into spray liquid, which is sprayed on the surface of plastic molds, and the antibacterial agent enters the surface of plastic parts during plastic injection molding; The other is to make a film of antibacterial agent and plastic, then attach the film to the surface of the mold, and combine the antibacterial plastic film to the surface of the workpiece when the plastic is formed. Using this antibacterial molding technology can greatly save the amount of antibacterial agent, but it is not widely used at present, mainly because of the large investment in equipment

in order to use antibacterial agents safely, especially when used in food, cosmetics and children's products, it is necessary to make toxicological evaluation of antibacterial agents, which is the basis for formulating use standards. In addition to analysis and testing, toxicological evaluation usually needs to obtain data through animal toxicity tests. Important test standards include: acute toxicity test, sub acute re pressing [calibration] key toxicity test, chronic toxicity test, carcinogenicity test, mutagenicity test, teratogenicity test, embryonic toxicity test, skin irritation test, eye irritation test, skin allergy test, etc. But in fact, it is not necessary to start the oil pump to send oil. Most antibacterial agents do not need to do the above tests one by one. For the new antibacterial agent formula, if the components in the formula have been tested and there is no chemical change between them, the test items can be greatly reduced

Application of antibacterial plastics

household appliances

Japan developed and manufactured antibacterial refrigerators in 1986. The focus of antibacterial was initially on the parts in the box, using antibacterial polyethylene materials to make fruit and vegetable box covers and water injection pipes of ice makers, using antibacterial polystyrene to make ice maker boxes and food trays, and using antibacterial ABS resin to make inner liners, etc. The antibacterial agent used is silver containing zeolite. In 1993, antibacterial refrigerators accounted for 15% to 20% of the 4.4 million refrigerators (440billion yen output value). Later, antibacterial parts were not only used inside the box, but also used in the hand contact part outside the refrigerator. The market share of antibacterial refrigerators doubled after

in 1998, Haier Group took the lead in the successful trial production of fs-zn antibacterial agent and launched a series of products with antibacterial functions, such as refrigerators, air conditioners, wave wheel washing machines, drum washing machines, freezers, dishwashers, vacuum cleaners, electric cups, gas stoves, and later launched and moved them. The antibacterial agents used are composite inorganic antibacterial agents, extruded antibacterial masterbatches and injection molded antibacterial masterbatches of Haier chemical company. The antibacterial components used in Haier antibacterial refrigerator include: internal liner, door lining, shelf, shelf trim, bottle base, bottle stop, egg box, ice box, frost scraper, fruit box, upper and lower parts of water tray, drainage channel, ice chamber drain, evaporator shelf, air duct, air duct cover plate, external door handle, trim strip, door seal, etc. Materials include hips, PS, ABS, PP, PE, PVC, etc. The antibacterial components of the air conditioner include the shell of the remote control, the keys, the air deflector, and the water tray. The wave wheel, inner barrel, water channel and filter cover of the wave wheel washing machine. Control panel button and control knob of drum washing machine. Door handle, door seal, sealing strip, broken gear, cabinet mouth, control panel, snow shovel of refrigerator. Dishwasher liner, upper cover liner, sprinkler. The upper cover, power switch button and handle frame of the vacuum cleaner. Knob of gas stove

in recent years, noble nano has further developed varieties of high-performance antibacterial masterbatches. At present, it has provided all-round technology for refrigerator manufacturers such as Meiling, Xinfei, Hisense, Kelon, Siemens, Electrolux, Huari, LG, Samsung, etc

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