What are the main categories of antiseptic（二）?
Continue our previous article to focus on several categories of fungicides
5. Organic sulfur
The representative product is methylene dithiocyanate (MBT). MBT sterilization spectrum is wide, bacteria, fungi, algae have obvious killing effect, can be used in pulp and paint anticorrosion. When used, MBT can be mixed with solvents and other synergists into a solution with a mass fraction of 10%, and when the addition amount is 7.5m/L, the sterilization rate can reach more than 99.8% within 30min, which is suitable for systems with pH value less than 11.
Commonly used organic sulfur antiseptic and benzothiazole-3-ketone, this preservative is very toxic to people and other animals, per ton of paper added 45-170g can effectively prevent pulp generation; When used for coating anticorrosion, its dosage is 0.015%-0.03% of the paint quality.
6. Organic bromine
2, 2-dibromocyanoacetamide is one of the typical organobromine bactericidal preservatives. It has killing and inhibiting effect on bacteria and mold, and can be used for coating and pulp anticorrosion. It is very easy to decompose, and the decomposition rate accelerates with the increase of pH value and temperature, such as at 25℃ and pH 6.0, it can be stable for 155h, and at pH 9.7, it is decomposed in only 6min. Therefore, it is suitable for use in medium-acid systems.
7. Heterocyclic compounds
For example, 1,3, 5-trihydroxyethyl have three throes, which have strong killing and inhibiting effects on aerogenes, pseudomonas aeronogenes, blastospore and Escherichia coli, mainly used for paint anticorrosion, and can also be used for pulp anticorrosion, with a wide range of pH values, and stable in a strong alkaline system. l, 2-benzoisothiazolin-3-one (BTT) is effective against bacteria, molds, yeasts and sulfate-reducing bacteria, especially against Gram-negative bacilli. It can be used for corrosion protection of coatings and pastes. It is acid-base stable and can be used in a wide pH range.
The newly emerged isothiazolinones (also known as cassone), whose main components are 5-chloro-2-methyl-4-isothiazolin-3-one (CMI) and 2-methyl4-isothiazolin-3-one (MI), have excellent antibacterial effects on a variety of bacteria, molds, yeasts and algae. The high efficiency, broad spectrum and environmental protection of this kind of antiseptic has also been recognized by the world, and can be applied to the sterilization and antiseptic of pulp, white water and paint, and the pH value is 4-8.
