Kunshan Qi Lin Environmental Protection Technology Co., Ltd.
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Address: Kunshan City, Jiangsu Province Economic
and Technological Development Zone Sheng Zhuang Road on the 18th
Fungicide (English name: mildew preventive), is to prevent microorganisms caused mold. For plastics, rubber, textiles, paints and insulating materials.
Fungicides main components: quaternary ammonium derivatives, Casson, surfactants, synergists and so on. Can prevent mold caused by microorganisms agents. There are phenols (such as phenol), chlorophenols (such as pentachlorophenol), organic mercury salts (such as phenylmercuric oleate), organic copper salts (such as 8-hydroxyquinoline copper), organic tin salts Triethyl or tributyltin, etc.), and inorganic salts of copper sulfate, mercuric chloride, sodium fluoride and so on. For plastics, rubber, textiles, paints and insulating materials.
Fungicide Category Cosmetics Fumigant Detergent Detergent Paper Fungicide Broad spectrum bactericide, bacteria, fungi, algae have a strong inhibitory effect. Mainly used in cosmetics, cleaning supplies, jelly water, creams, liquid soap and wet paper towels and other daily anti-corrosion.
Appearance Physical and Chemical Indicators: Appearance colorless to amber Clear liquid PH value 2 to 4 density (20 degrees Celsius), g / cm3
1.160 ~ 1.190 Refractive index 1.3700 ~ 1.3860 Content (%) -99≥10 -99B≥3
Antiseptic effect: Mice acute oral LD50 (g / Kg)> 5.00
Rabbit acute skin irritation test (stock solution)
1, broad-spectrum antibacterial: The product of fungi, bacteria, molds and enzymes have a very good killing and inhibition.
2, non-toxic long-lasting: no smell, oxidation, reducing agent stability.
3, good compatibility: does not destroy the matrix of the emulsifying effect
4, wide range of applications: in the range of 2.0 ~ 12.0 can be used, low dosage, no limitations.
Fungicide effect mechanism
The main reason for the erosion of the polymeric material by mold is the various additives that are added to the system. Therefore, reducing the number of auxiliaries that are known to be susceptible to fungal attack, or adding fungicides, are all effective ways to enhance the antibacterial ability of the material. Fungicide fungicide killing effect is through the cell membrane of its spores into the cell, eliminate spores or prevent its germination in order to achieve the purpose of preventing mold growth. Fungicide in the fungal spore cells toxic effects as the following ways:
(1) inhibit the activity of the enzyme system. Because the enzyme system and mold cells in the spores of a variety of metabolic effects are closely related.
(2) destroy the energy release system.
(3) -NH2 and -SH react with enzymes to inhibit the function of enzymes (such as organic mercury compounds, organic arsenic and quinones).
(4) excessive promotion of phosphate oxidation - reduction system, thereby undermining the function of cells.
(5) Inhibition of RNA synthesis during cell germination, thereby preventing spore germination.
(6) Inhibition of electron transport system or transaminase system.
English name: 10,10'oxybis-phenoxarsine International abbreviation: OBPA CA registration number: 58-36-6 Molecular formula: C24H16O3As2 Properties: OBPA is arsenic-containing organic compounds , White crystals, insoluble in water, solubility in general organic solvents is not large, soluble in methanol, chloroform, benzaldehyde, dimethyl formamide and so on. Melting point: 180 ~ 184 ℃, specific gravity 1.40 ~ 1.42, thermal decomposition temperature of 300 ~ 380 ℃. Stable in weak acid or weak base, sensitive to ultraviolet light, sealed. Product Specifications: OBPA content ≥99% CPA content ≤0.1% DPE content ≤0.2% PAA content ≤0.3% Other impurities <0.1% Volatile content ≤0.2% Usage: OBPA is a new type of industrial antifungal agent, which can simultaneously Mildew, antibacterial, anti-algae, is one of the most effective antibacterial agents in the industrial field. Can be added to PVC products, plastic products, PVC floor materials, wall coatings, paints, inks, paper, etc., than other inorganic or organic antibacterial or only anti-mildew effect is more excellent.
OBPA is the main anti-mildew antibacterial active ingredients, as early as before World War II has been developed, the bacteriostatic ability is very strong, but because of the use of very low dose, dispersion is not easy to be widely used, not a large number of commercial use, so the world There are almost no manufacturers. And later because of plastic products to solve the problems caused by mold and bacteria, the patent developed OBPA dispersed and combined with plastic technology, a very low dose is combined with the resin can not seepage, and finally a trace added to the processing of molded products Toxicity is lower than other types of antimicrobials, and may even be equal to the polymer itself. Oral toxicity mice LD50> 20gms / kg, so it has been widely used in plastic processing products for more than 30 years. However, due to the limited R & D manufacturers involved in patent issues, OBPA plastic fungicides market has long been oligopoly.
Fungicide influence factors
Fungicide effect is not static, it is affected by many factors.
1. Microbial factors
Different fungicides fungicidal effect of the pH range of the most appropriate, such as benzoic acid in the pH range of 2.5-4.0 optimum pH above 5.5 when no effect on many molds. Sorbic acid can be used in the pH below 5-6, propionic acid optimum pH below 5.0. Fungus feed types and levels of pollution often changing, and sometimes the development of mold resistance, which affect the anti-mildew effect. However, it is generally believed that when short-term storage of dry feed, microbial factors seem to be less affected by physical and chemical factors.
2. Physical and chemical factors
Feed water content: Water is one of the most important factors that determine whether mold can grow in feed. When feed water reaches 17-18%, it is the optimum condition for fungus to produce and produce poison. Most mold germination requires about 75% relative humidity, rapid growth at 80-100%. The moisture in the feed includes the moisture in the feed ingredients, the water added in the process and the moisture in the storage environment. Bacteria, yeast, etc. must grow in the presence of free water, and the growth of the fungus depends on the available water, even in the absence of free water. Fodder moisture on the fungicide effect is more complex, for different water feed, the dose is also increased accordingly.
② temperature: the most suitable temperature for all kinds of fungi breeding 25-30 ℃, but Mucor, Rhizopus, Aspergillus niger, Aspergillus fumigatus breeding temperature 25-40 ℃. Therefore, at different temperatures, the use of different amounts of antifungal agents.
③ feed ingredients: feed calcium carbonate (stone powder) and protein feed (soy flour, fish meal, etc.) can play a role in the acid, so that the effect of antifungal agents decreased, so the feed should add a greater proportion of fungicide . Feed fat can increase the penetration and distribution of organic acids to enhance fungicidal effect.
④ feed formulations: feed steam pressure granulation can partially kill feed microorganisms and reduce the number of bacteria and molds, granulation process feed heating higher, the better. However, the re-wetting of the pellets accelerates the growth of molds (non-killed molds) and results in mildew of the feed faster than the powder because the mold is more susceptible to mold due to starch gelatinization during granulation due to high pressure, high temperature and high humidity Digestion, it is important to add feed pellet feed. Studies have shown that, for the antibacterial effect of the powder, propionic acid is superior to calcium propionate, but vice versa for wet pellets, which may be due to the adverse effect of steam treatment on volatile propionic acid.