Isothiazolinone bactericide is a broad-spectrum bactericide, which can be used as a bactericide in circulating cooling and papermaking wastewater treatment, and has excellent bactericidal and slime growth inhibition effects. After adding 40ppm of this product, the bacteria will not rebound within one week.
Active bromine bactericide is suitable for killing bacteria and algae in industrial circulating cooling water, oil field water injection, papermaking wastewater and sewage. Compared with liquid chlorine, this product is especially suitable for alkaline and water systems containing ammonia and nitrogen compounds, and will not cause environmental pollution. This product has bactericidal activity only when it is used with sodium hypochlorite or chlorine. Generally, the residual chlorine is maintained at 0.3 ~ 1ppm2 ~ 4 hours, and added once a day. When in use, the active bromine is diluted by 10 ~ 20 times with water, and then the corresponding bactericide is added. 10 ~ 15 minutes later, it can be added into the water system to be treated, and the residual chlorine is determined after about 5 ~ 10 minutes.
Thiabendazole, carbendazim, o-phenylphenol, dichloromethane, chlorothalonil, salicylanilide and biological inhibitors can be used in combination.
Leather:
At present, the mildewproof agents used in leather industry mainly include the following categories:
1 inorganic compound
(1) hypochlorous acid and its salts, sodium chlorite, potassium permanganate, iodide, boric acid and its salts, sulfite and pyrosulfite, etc. At present, these compounds are mainly used as auxiliary components of antifungal products.
(2) Inorganic nano materials: nano titanium dioxide, nano silicon dioxide, nano zinc oxide, etc. The development of inorganic nano-materials is a hot spot in the development of antibacterial and mildew-proof agents for leather at present, but most of them are in the initial stage, and the products of nano-leather mildew-proof agents that are actually used have not been reported.
2 organic compounds
(1) Organic phenols and halogenated phenols: Phenols mainly include cresol, phenol, tar phenol, benzyl phenol, ethyl naphthol and aminophenol. Halogenated phenols mainly include chlorophenol, dichlorophenol, bromophenol, p-chloroxylenol and 2,2-methylene dichlorophenol. This kind of compound is the most used mildew inhibitor in the past, but with the increasingly strict environmental protection regulations, the use of this kind of mildew inhibitor has been restricted and gradually replaced by other kinds of compounds.
(2) Alcohol compounds: benzyl alcohol, ethanol, halogenated nitroalkanol, etc. At present, these compounds are mainly used as auxiliary components of mildew-proof products.
(3) Esters: halogenated salicylate, hydroxybenzoate, halogenated vinyl phenyl ester, halogenated benzyl acetate, pentachlorophenyl dodecanoate, α, β-unsaturated carboxylate, etc. The toxicity of these compounds is relatively low, especially α, β-unsaturated carboxylic acid ester has a good inhibitory effect on mold, and it is a kind of mildew inhibitor with development potential.
(4) Amide compounds: halogenated acetamide, salicylanilide, aminobenzenesulfonamide, tetrachloroisophthalonitrile, etc. These compounds are effective components of commonly used fungicides at present, and have good antifungal effect.
(5) Quaternary ammonium compounds: dodecyl benzyl dimethyl ammonium chloride (bromogeramine), dodecyl benzyl dimethyl ammonium bromide (bromogeramine), alkyl pyridine hydrochloride, cetyltrimethyl ammonium bromide (163 1), etc. Because of their low toxicity, broad bactericidal spectrum, high efficiency and good water solubility, these compounds have been widely used in industrial water treatment, wastewater treatment and petrochemical fields. In leather industry, quaternary ammonium compounds are generally used as leather preservatives, but less as leather mildew inhibitors. At present, it is also a research direction to develop new quaternary ammonium salt bactericidal components for leather mildew prevention.
(6) Heterocyclic compounds: benzimidazole, benzothiazole, mercaptobenzimidazole and its salts, hexahydrotriethyltriazine, nitropyridine, 8- hydroxyquinoline and its salts, benzisothiazolone, dimethylthiazide, etc. At present, most leather fungicides take heterocyclic compounds as effective components, which have low toxicity, broad bactericidal spectrum and good mildew-proof effect, and are the mainstream development direction of leather fungicides.
(7) Organic sulfur compounds: Dichloromethylsulfone, allicin, dibenzoyl disulfide, mercaptopyridine, pentachlorophenol, etc. There are many organic sulfur compounds as effective components in leather mildew inhibitors, such as 2- (thiocyanomethylsulfur) benzothiazole with good mildew resistance, which is often classified as organic sulfur compounds.
The dosage of mildew inhibitor should be properly controlled. If the concentration is too low, it will not achieve the purpose of sterilization or bacteriostasis, while if the concentration is too high, it will lead to high production cost. The concentration of mildew inhibitor used in tanning process varies with different mildew inhibitors, which should generally be about 0. 1 ~ 0.5% of leather weight. The dosage of common leather mildewproof agents is as follows:
0.3-0.5% of A-26, 0.04-0.1%of Oitz, 0.01~ 0.5% of TCM TB, 0.2-0.5% of p-chlorocresol (PCMC) and 0.5% of o-phenylphenol (OPP). Only when the concentration reaches a certain value can the mildew inhibitor play an effective role in mildew prevention.
Specific: alkyl azobenzene bromide has a very effective bactericidal effect. It is acid-resistant and alkali-resistant, soluble,
Slightly toxic, it can improve the fluidity of the mixture without reducing the strength of concrete, and the dosage is only 0. 1.25 ~ 0. 1.05%. It can also be used as a metal rust inhibitor to protect internal steel bars. Organotin preparation also has very effective bactericidal performance. It is neutral, nonflammable, soluble in water, and has a wide bactericidal spectrum, which is effective against bacteria, fungi, fungi and insects.