Do you know what isothiazolinone? Ten perspectives will help you understand the true nature of isothiazolinone.
Isothiazolinone Overview
Isothiazolinone is a very important industrial chemical, often used as a highly effective, broad-spectrum, low-toxic antiseptic. Known for its excellent antibacterial and preservative properties, it is widely used in various industries, including industry, daily chemicals, and food.
1. Chemical Structure of Isothiazolinone
Isothiazolinone is a class of sulfur- and nitrogen-containing heterocyclic compounds. Common active ingredients include:
CMIT (5-chloro-2-methyl-4-isothiazolin-3-one)
MIT (2-methyl-4-isothiazolin-3-one)
They are often mixed in a 3:1 ratio to form a highly effective antiseptic system.
2. Physical Properties of Isothiazolinone
| Appearance | Typically a colorless to pale yellow, transparent liquid, but can also be brownish yellow (at high concentrations) or pale green (at low concentrations). |
| Odor | Slight characteristic odor. |
| Density | Approximately 1.01–1.32 g/cm³ (depending on concentration). |
| Solubility | Soluble in polar solvents such as water, lower alcohols, and ethylene glycol. |
3. Core Functions of Isothiazolinones
Isothiazolinones are commonly used as broad-spectrum antiseptics. They have strong bactericidal and inhibitory effects against a wide range of microorganisms, including bacteria, fungi, yeasts, and algae.
4. How do isothiazolinones kill bacteria?
The mechanism of action of isothiazolinones is that they rapidly penetrate the cell wall/membrane of microorganisms and irreversibly bind to proteins and enzymes within the cell (particularly enzymes containing sulfhydryl groups), inhibiting respiration and energy (ATP) synthesis, interrupting cell division, and ultimately leading to the death of the microorganism.
5. What are the applications of isothiazolinones?
Isothiazolinones are widely used and are used in almost all water-based systems where microbial growth is a concern.
Daily Chemical Industry: Anti-corrosion for personal care products such as shampoo, conditioner, shower gel, facial cleanser, skin care products, and wet wipes.
Industrial Applications: Anti-corrosion and mildew prevention for paints, coatings, polymer synthetic emulsions (such as latex paint), adhesives, metalworking fluids, inks, and papermaking pulp.
Water Treatment: Used as a biocide in industrial circulating cooling water, sewage treatment, and papermaking white water systems to control algae and bacterial growth.
Other Applications: Pesticides, wood preservatives, and leather treatment fluids.
6. Advantages and Characteristics of Isothiazolinones
Broad-spectrum and High-Efficiency: Excellent anti-corrosion performance can be achieved with extremely low dosages (typically 0.01%-0.1%).
Good Compatibility: Excellent compatibility with various formulation ingredients, and not susceptible to chemical reactions that could render it ineffective.
Wide pH Range: Stable and effective over a wide pH range (typically 2-9.5).
Easily degradable: It readily degrades in the natural environment and does not cause long-term environmental accumulation.
7.PH Range of Isothiazolinone
The disinfectant isothiazolinone is suitable for a wide pH range: generally stable between 2 and 9;
It has stronger bactericidal activity under acidic conditions;
It may decompose in strongly alkaline environments.
8. Degradability of Isothiazolinone
The advantage of isothiazolinone in terms of degradability is that it does not persist in the environment. It is easily and rapidly degraded to non-toxic substances through biological and chemical means under light, aerobic, and anaerobic conditions, thus avoiding bioaccumulation and long-term environmental pollution.
9. How safe are isothiazolinones?
Low Toxicity: Acute toxicity is low, but high concentrations can be irritating.
Sensitizing: Some people may experience skin redness, swelling, and itching.
Environmental Safety: Biodegradable, but high concentrations can be toxic to aquatic life.
Regulatory Limits: The EU limit for MIT in leave-on cosmetics is 0.0015%.
10 Precautions for Using Isothiazolinones
Strict Dosage Control: Add the product strictly according to safety regulations and recommended dosages. Never exceed the recommended dosage.
Personal Protection: Production operators should wear protective gloves, glasses, and masks to avoid direct contact with high-concentration stock solutions.
Avoid the presence of strong reducing agents, sulfides, and ammonia compounds: these substances can cause the product to decompose and become ineffective.
Temperature Sensitivity: High temperatures (>50°C) or prolonged exposure to extreme pH conditions can accelerate its decomposition and reduce its efficacy.
