Benzisothiazolinone, with the CAS number 2634-33-5, is a widely used chemical compound. It is a white to off - white crystalline powder. The molecular formula of benzisothiazolinone is C₇H₅NOS, and its molecular weight is approximately 151.18 g/mol. This compound has a melting point in the range of 158 - 160 °C. It exhibits good solubility in organic solvents such as ethanol, acetone, and toluene, while its solubility in water is relatively low. Benzisothiazolinone has a characteristic odor and is stable under normal storage conditions. However, it should be stored in a cool, dry place away from direct sunlight and sources of heat.
Benzisothiazolinone is a powerful biocide. One of its primary uses is in the preservation of industrial products. In the paint and coating industry, it is added to prevent the growth of bacteria, fungi, and algae. This helps to extend the shelf - life of paints and coatings, ensuring that they maintain their quality and performance over time. In water - based adhesives, benzisothiazolinone can inhibit the growth of microorganisms, thereby improving the stability and storage characteristics of the adhesive. It is also used in the personal care products industry. For example, in shampoos and lotions, it can prevent the growth of harmful bacteria and fungi, ensuring product safety for consumers. In addition, benzisothiazolinone is employed in the paper and pulp industry to control microbial growth in the production process, improving the quality of the final paper products.
When using benzisothiazolinone, it is crucial to follow proper safety procedures. First, wear appropriate personal protective equipment, including gloves, safety glasses, and a lab coat. The dosage of benzisothiazolinone varies depending on the specific application. In the paint industry, the typical dosage ranges from 0.05% to 0.2% by weight. In personal care products, the concentration is usually much lower, generally less than 0.1%. Before adding benzisothiazolinone to a formulation, it should be thoroughly mixed in a suitable solvent or carrier. For example, if used in a water - based system, it can be pre - dissolved in a small amount of water or an appropriate co - solvent. After adding it to the main product, continue to stir the mixture to ensure uniform dispersion. It is important to note that benzisothiazolinone should not be mixed with strong oxidizing agents or reducing agents, as this may cause chemical reactions and reduce its effectiveness or pose safety risks.
Case 1: Paint Preservation
A paint manufacturing company was experiencing problems with microbial contamination in its water - based paints. After adding benzisothiazolinone at a concentration of 0.1% by weight, the growth of bacteria and fungi was effectively inhibited. The paints were stored for six months under normal conditions, and there was no visible signs of spoilage or degradation. The color and viscosity of the paints remained stable, and the coating performance on test substrates was excellent.
Case 2: Personal Care Products
A cosmetics company was developing a new line of shampoos. They added benzisothiazolinone at a concentration of 0.05% to prevent microbial growth. During the product stability testing phase, which lasted for three months at different temperatures, no microbial growth was detected. The shampoo maintained its original texture, fragrance, and cleansing ability, indicating that benzisothiazolinone was effective in ensuring product quality and safety.
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